HAVE YOU BUILT small models lately answer follow ing questions yes read lighter scaled-down airplane may just what need right now have spend first hour flying field hands knees assem bling newest 60-powered wonderbird equipped tuned pipe Have ever passed over trip flying field because didnt want go trouble haul ing assembling feeding large model myself have passed up trips field no other reason down about quart glow fuel know quart fuel wont fly model long enough make trip worth right Franidy opinion large models can pain nuisance Propellers run $2 apiece break look wrong Having purchase MonoKote four rolls time Trips flying field awkward best downright uncom fortable worst disassembled cumbersome airplanes take up much room car someone must either hold engine lap hold tail keep blocking drivers line sight rearview mirror did ever notice much farther big models scatter break bigger harder fall certainly holds true flying field Larger models just have wider radius catastrophe Well ever build large models Simply because worth size weight allow fly graceflilly gently easily small models theres no remedy As rule larger models have light er wing loadings due scale effects retain good flight characteristics very high wing loadings cant argue bigger better Scale building Big engines seem easier adjust buy last longer Radios fit right want still leave plenty room other things such re tractable landing gear smoke system Big planes simply have air being serious respectable little ones Brawny appearance isnt everything though Oddly enough sophisti cated models know happen lightestthe Indoor microfilm models Al26 Model Aviation Top Although model quick large horizontal stabilizer prevents having nasty habits other little models bright colors help eyes stay locked onto small high-speed target Aside being fun main objective model hone piloting skills doing minimum Investment money aggravation Take things slowly first few flights sure keep plenty air under trying out new maneuvers S PARROW DESIGNED BY STEVE GARDNER FIBERGLASS COWL SPRUCE SffiRS IN3/3z BALSR RI5 /x FI TESTOCK ILSR STRIP rBRLSA3HEET N- BLSP SHEEJ 25 ENGINE N 7 ZDIA SPINNER 1DiA 1IL WHEEL CE &LSA HATCH 5QMAPLE LANDING GEAR BLOCK4ll j DIR MUSIC WIRE LE- Left Remove prop five sheet metal screws have easy access tne engine tuel tank battery pack engine problems really problems fuel system important have easy access fuel tank Right height firewall makes cowl 15-size engine appear short height front allows larger engines longer cowlings used looking odd Left Our author says has always preferred belicranks actuate ailerons because have least amount play system available also allow aileron servo mounted flat wing save space Right hold thin wire landing gear groove nylon straps slanted puts screw head closer wire applies pressure directly wire though dont say words devotees big models often think smaller-scale airplanes little better toys So big models imposing flying field have other virtues smaller craft offer different compensations lighter birds often very distinctive flying challenges modeler ways big ones dont Small models antidote complacency can stand taken seriously youre game piloting ship will fly smoothly unless fly smoothly reaction time up smaller airplanes unruly manners might just ready think small might just ready sacrifice prestige ease big prepossessing models ex citement knowing youve learned handie airplane competently well youre weary lugging around support gear big model little guy definitely ticket need starting battery pint fuel trans mitter youre ready go Because smaller plane will fit cars having disassembled no tools needed pint fuel will keep air four 10-minute flights smaller model will bounce larger would shatter Above said before lighter bird will keep toes Small models have characteris tic twitchiness dont want fly smooth ly nervous giddy machines al ways quick translate control input abrupt change flight path what amounts much greater con trol authority pilotextra maneuver ability motivated flier can use good advantage practice can learn orchestrate intricate maneuvers can gotten larger airplane fact can learn fly Sparrow smoothly youll able handle anything larger precision never knew Little airplanes train reflexes better fastest video games low inertia models makes possible cer tain maneuvers forbidden larger ones Sparrow will snapping maneu vers like no other airplane have ever flown can start stop snaps literally instan taneously once have required tim ing Eight-sided loops easy too corners sharp Finally smaller models easier build up certain strength Like early Grumman fighters Sparrow de signed nearly indestructible flight Although its slightest overbuilt airplane allows enter abrupt ma neuvers much higher speeds might larger model Its light weight low inertia permit rapid-fire succes sion maneuvers despite its low drag comes time slow down Spar row will lose speed rapidly rather like having built-in glide path control Larger aircraft still rule flying field smaller birds complement nicely could certainly worse build Sparrow stable models learn put want skills control authority youll de velop maneuvering airplane guar anteed carry over flying Construction standard practice build tail surfaces first sort warm-up Tail surfaces easy build too demanding theyre fairly painless way get modeling mood tail surfaces shouldnt carefully constructed rest 28 Model Aviation /4 DIA DOWEL IL SOFT BALSA BLOCK HOLLOWED WING TIPWING PLAN TOP VIEW1/L4 SPRUCE DOUOER CENTER ALL WING SHEETING1/2 ESECT IS 1/16 BALSALG BLOCKS-if -2AV~fl [v32][b-1-10-1-10]] ALL BiC BRACE III/BPLY 1/BPLYDIIEDRAL B MOUNTBRACE ___IW9W __K7 — __- W3W-2 __-U 1 0 WING DIHEDRALAILERON- 3/4 AT EACH TIPHORN1/4 BALSA SHEPTCENTER SECT COVERED I/B BALSADOWEL RETAINERWITH 2 OZ FIBERGLASS -0 Ki7[11ISUB-SPAR HINGEIz3/8 BALSA 3/16 HARD BALSALOCATIONT E STOCK FILL I/B PLY C L FORMER C 1/4 BALSA1/4 TRI SHEETSTOCK P2 Fl F-I S F2 1/16 PLY ____ACE 1/B PLY PLATE IN HATCH FOR HATCHMOUNTING SCREW 1/4 TRI W NG BO T 1F3MOUNT 1/4 TRI-STOCK CZ-. F-IR COWL IS 2 LAYERS OF 6 OZ FIBER GLASS / _____ TYPICAL HARDWOOD/1/8 HD BALSA FUSELAGE BOTTOM COWL MOUNTLBxI/4TYP HARD- WING SADDLEVIEW WOOD HATCH MOUNT BLOCKGLASS COVERED FOAM OR CLEAR COMMERCIAL CANOPY I/B MED BALSA P3FUSELAGE SIDES1/4 TRI-STOCK HO WOOD 7/BLOCK IF-4 2 DA SP NNER ______________________ I/B HO BALSA .5rzz* G SADDLE i ALL RIBS ARE ----..3/32 BALSA SHEET MEDIUM 1/B MED BALSA FUSE SIDES P4 1/4BALSA- SHEET~i STABILIZER ___-—ELEVATORHINGE TO SUIT I/4DOWEL/4 BALSA SHEET 1/8 BALSA1/B PLY GUSSETMOUNT ii7~ ~2I 1/4 BALSA SHEET ___________________IL LIGHT 1/B BALSA SI-EET BOTTOM OMITTED FOR CLARITY7I 1/4 TRI-1/x STOCK/4 BALSA SA STRIP ______/OUTLINES TRI- STOCK 7I' FINRUD \\ 1/4 BALSA SHEET TOP/ I/4BALSA VERY LIGHT 4 4 NYLONSTRIP FORMER1/B BALSA SHEET LSHARDWOODBOLTI/B BALSACROSS GRAIN PLBLOCKSUGHTSHEET BALSA1/8 DIA OS FSR 25V4UIBBLOCKMUSIC WIREFUSELAGE SIDE VIEW ENGINESPRUCELIGHT BALSA BLOCK HATCH 2 DIA WHEELSFull-Size Plans Available See Page 178 /4 BALSA SHEET 1/4 TRI 4K 1/B MED I/B PLY I/B PLY 0I2 345 6 MODEL AVIATION SPARROW DESIGNED BY STEVE GARDNER TRACING BY OE DEMARCO ALL RIGHTS RESERVED Left A dog-leg wire elevator push rod model small mistake would big 60-powered job careful make cross leg short possible sure longer sections parallel Right Control surfaces may seem too small first glance adequate conceivable maneuver keep hinge gaps small possible maximum efficiency model its just arent very hard build correctly critical step constructing airplanes tail proper choice wood gram build tail will add about five grams weight fin ished model Overbuilding will force compensate extra nose weight Worse still may try fly adding extra weight Add extra nose weight performance suffers Sidestep problem model wont fly Obviously building tail too heavy puts quandary best avoided ideal wood Sparrow tail surfacesbalsa 6- 8-lb-per-cu-ft classeliminates need add nose weight However form need balsa usually hard find Whats wanted stiff firm grade bal sa punky material feels like Styrofoam type balsa also wood choice building Hand-Launched Glider wings Free Flighters hoard like treasure mentioning possibility getting some stuff Free Flighter would probably fool hardy Dont try substitute 3A6-in balsa A-in thickness specified plans extra thickness needed lend adequate stiffness horizontal stabilizer ra tionale based having seen just about stab failures wing failures stabilizers get pounding flight theyre also subject getting hung door jambs trunk lids because promi nence Stabs built A-in balsa can stand abuse wont come apart until break off against ground As shown plans Ive made up edges fin rudder using strips grain running parallel edge purpose simply make edges easier round well help hold tail straight Since pieces A-in balsa small tend warp toO badly strips optional save having round end grain surfaces cant well enough suit stan dards use strips elevators joined either strip hardwood dowel square fiber glass cloth may folded over dowel leading edge elevator rein force joint will also strengthen area elevator horn mounted Trim cloth away slot 30 Model Aviation fuselage resist urge make slot elevator smaller Although clearance may seem excessive now can quickly become inadequate tail gets wet fuselage swells just tad situation elevator will jamand happens flight over maybe good Sand leading edges rudder elevator housetop-shaped point set hinges wood until hinge pin centerlines point housetop will allow leave very small gap hinge line MonoKote hinges may used preferred because particular geometry might necessary enlarge hole fuse lage order clear greater motion elevator joiner Fuselage Underestimating structural importance fuselage seems fairly common error among modelers Ap parently such builders assume func tion fuselage merely hold wing tail proper juxtaposition oversimplification Any part model exposed airflow has impact performance reality Continued page 32 Left If use older large radio like installation will tight impossible Using smaller servos ana u mn Dattery pack makes things easier saves weight Right Mounting aileron servo flat wing gives room between other servos ORDERS SHIPPED DAY RECEIVED WARBIRD VIDEOS VHS OR BETA OUR 23RD YEAR SPE6IA[ IWTRODO6IORY OFFER WARBIRD CHECKOUT VOL 1 Flying P-40 Warhawk Corsair Hellcat SB2-A Buccanneer Avenger NF 1325 Programs2 Hr Only $3995 ANY TWO VIDEOS ONLY $7595 ANY 3 VIDEOS ONLY $10795 AILS VIDEOS ONLY $19995 WARBIRD CHECKOUT VOL 11 Flying P-38 Mitchell Bomber P61 Black Widow Invader NF 1454 Programs100 Mm Only $3995 WARBIRD CHECKOUT VOL III Flying P-51 Mustang A-20 Bomber P-39 Introduction P-39 Advanced NF 1514 Programslb Mm Only $3995 CALL TOLL FREE IT CARDS LJ Day Night California outside USA Shipping Paid Continental USForeign add $500nts add 6 1/2% tax NF VIDEO LIBRARY 13470 WASHINGTON BLVD STE 207 MARINA DEL REY CA 90292 fuselage has much greater effect average modeler credits As fin rudder effect primarily flight direction fuse lage has exposed area fin rudder no matter what input give airplane swaybacked fuse lage will never fly straight enough suit model has crooked fuselage will fly straight speed trim will Because very tall narrow fuselage Sparrow actually functions like flight surface allowing plane perform knifeedge flight gracefully larger models its particularly important build straight mild bend fuselage sides facilitates very careful choos ing wood two sides dont have equal degree springiness fu selage almost fated come out crooked Start making up left right side wing saddle doublers spruce tank hatch strips pieces installed before sides joined intend install engine larger 19 engine have mind very hot before assembling fuse lage sides might fiberglass inside forward area say wing doubler up 6-oz glass cloth Hot Stuff isnt necessary stay engine-size limits dictated design have never yet seen model some didnt eventually subject over sized engine firewall made up two layers %-in ply Glue together installa tion later Drill hole wing dowel No 3 former have favorite method locating hole follow location specified plans exactly Slight incidence misalignments may scarcely noticed larger model will very detrimental model small Make cutouts No 4 former through pushrods extend rear model Adapt parameters cutouts shown plans suit radio necessary dont weaken area wing bolt block attaches Af ter have decided cutout patterns made sure formers configured radio glue No 3 4 formers fuselage sides Use triangle get formers square side other side glued top fu selage laid flat workbench Draw two sides together form tail very careful twists get built fuselage can traced operation Glue firewall using epoxy fast-setting glues have much improved last few years serve well purposes have better luck epoxy very high-vibration applications top block made very light A-in balsa sheet punky stuff took pains avoid building tail fine long its extremely light Dont hollow out unless unable oh32 Model AviationContinued page 34 Last An Automatic Full-Feathering Adjustable Pitch Propeller An exclusive patented 4 mechanism lets adjust pitch 8-4O optimum perfor mance blades automa tically feather when motor stops reduce drag give much Recommended 72-80 motor gliders similar models wing 4 loads up 14 ozI sq ft 05 direct e systems 1/ drive shaft Stock No MAO8XXE $2495 Suggested Retail Available Through Leading Distributors WINDSOR PROPELLER CO 384 Tesconi Ct Santa Rosa CA 95401 WARBIRD CHECKOUT VOL V Flying 8-29 Pre-Flightof BI7E Flight 8-24 NF 1553 Programsi 07 Mm Only $3995 WARBIRD CHECKOUT VOL IV Flying P-47 3 parts Flying T-6 3 parts NF 1366 Programslb MIn Only $3995 MODERN JET FIGHTER Flying F/A18 Hornet Eagle 6 F16C nnl Th4 ndohieds AC Custom Aviation Prints Original Pai Custom made photo prints ot several recent Model Builder COVER PAINTINGS Bob Benjamin now available INCLUDING Cl Prints future Model Builder COVER PAINTINGS will also available have something special mind Bob pleased discuss creating new originals custom commission basis ooorplete detale ne ordering prhits Inquire out alginat pairIngs oMI writ Robert Benjamin Aviation Art 1222 26th Ave NE Olympia WA 98506 206 352-2602 Curtiss Jenny * Quality hand-cut kit complete plans rigging scale control setup wire parts pre-bent special hardware included parts individually indentified packaged Decals Major Decal * Engine sizes 20 40 FS 25 TS * Wing unit removes four screws less 3 minutes flying wires left intact * Superb flight characteristics Introductory Price 812500 VISA erCard y Order Michigan residents add 4% sitien tax Add $550 P81 US orders $1250 foreign Video Catalog $1250 post incH VHS/Beta $5 rebate wilt roturn tapo kit ordor Reg catalog sample mini-plan *2 Hand-Cut Quality Affordable Price AERODROME MODELS LTD 2623 S Miller Rd ~__Saginaw Ml 48603 517781-3000 Othor Kits Avaiiabie Aero-Pacer Saby -Pacer Gipsy Moth Rybaby Fiybaby combo Hawkor Hurricane Jester tam wood thats sufficiently light because should have enough mass give stiffness fuselage Glue top block onto fuselage add triangle stock can see plans goes almost everywhere Make tail wheel strut /16 music wire Sew little ply former stall rear fuselage lack steerable tail wheel bothers theres no reason add using favorite method doesnt seem necessary model Add strip balsa uprights crosspieces rear fuselage well wing bolt block its triangle rein forcements Sheet bottom assem bly grain running crosswise Make hatch balsa block small plywood squares inserted inner face Attach wood screws small hardwood blocks added inside nose helps control vibration front model allowing hatch take some structural load nose prototype used two points tachment diagonal corners hatch using four plywood squares works much better easy access fuel tank isnt important youre planning stall engine larger recommended 19 size can skip foregoing just glue hatch place Personally like maintainability separate tank hatch Slot top block fin Doing after fuselage assembled ensures accu rate alignment completed fuselage shaped rounding top block hatch chose round off sharp corners behind wing prototype can wish adding triangle stock canopy Sparrow must very narrow fit properly can find ready-made fills bill means use Being unable find canopy narrow enough used Styrofoam custom make prototype After shaping foam suit give coat 2-oz glass cloth epoxy resin Paint prime canopy match model Since canopy factor determining size fin rudder would unwise 34 Model Aviation include model airplanes knife-edge capabilities might diminished model would behave needed dihedral Wing builder encounters biggest challenge Generally wing hardest part model build right other part model want wing warp-free yet its difficult part build warps want honest-flying Sparrow its wing must straight Ensure its straight warp-free before cover once webbing place wing will twist great extent wing area small old trick straightening wing MonoKote will work very poorly Dont rely Make spar carefully selected straight-grained spruce Using very straight-grained wood protects model coming apart air no matter much beating its given Test sam ple seeing can follow grain layer least 10 find piece straighter grain spar joined unusual manner Two strips spruce scraps left over making spars used double joint between spars center wing installed between top bottom caps just like splints 3A6-in ply plate shaped conform wing spar sweep epoxied place after wing joined wing dowel should glued place before wing sheeted ensure strong bond center ribs A-in balsa pieces side wing no stronger joint very certain its accu racy double-check wing straight before web spar webbing should installed very carefully under great deal strain modelers realize dont want have gaps would need filled glue webbing should run along straight vertical best effect Nothing else gives much strength small weight increase does proper web bing prototype I built up ailerons Continued page 36 ct OO J Power W Products Inc Only certified checks money orders accepted Minimum Order glom three packages 4 Pumerpoles $3 per package $t shipping huodhogi CT residents add 70% sales tao Prices nubiect ohange nofice DEALER INQUIRIES INVITED further information dealer paces send SASE Business Card SERMOS RIC SNAP CONNECTORS~ Celar Canes Si 8ox 16787 Stantad CI 069C203322-6294 pieces trailing edge sheeting cut out make aileron wells could over again would simply make solid balsa have indicated plans weight sav ings turned out almost nonexistent construction much timeconsuming making solid ailerons would have recommend using bellcranks because re careful about rig offer least amount play system wing can accommodate Id think twice about substituting something else airplane needs ailerons center time let go stick little stiffness acceptable Once sheeting place cover center joint 6-oz glass cloth ep oxy resin Hot Stuff cutout servo wing sheeting easier make before center section covered glass wing faired fuselage very light balsa block glued top glass wing block bolts should set fairing until bear wing self used 10-32 nylon bolts proto type because ability break away before wing block does However since nylon bolts difficult find some areas can substitute regular A-20 bolts necessary Assembly Bolt wing place true horizontal stabilizer eye much easier sounds Holding model up nose pointed towards change angle model until stab makes line just above top surface wing Adjust stab until paral lel wing measure top center firewall tips stab get proper alignment indicated plan view fin simply fitted slot top block its alignment will no bet ter slot Use triangle get fin square stab such small model misalignments will have magni fied effect exacting can dur ing assembly cowling built up same way canopy its bit difficult make fit perfectly engine its mount mount model tack glue foam blocks around engine up back spinner Mark foam front locate spinner circle Gently remove foam take engine mount off model preserve location spinner circle tack foam back onto model exactly broke off Glue front cowl former onto foam Carve sand foam shape prefer try fancier shape prototype keep lines simple will look odd Remove cowl form model cut off about / out side edge foam back cowl allow thickness fiberglass 36 Model Aviation SNAP POINT KNIFE SAMPLE Blade Included Send $125 Stamps 5/25s please Write Complete Price List Berkeley Trading Co PO Box 26- Dept HB Berkeley Springs WV 25411 258-2 773 THE FOX 50 HERE Light enough 40 size airplanes Powerful enough 60 size airplanes * * * * often have wished little power 40 size model couldnt see potting big heavy 60 up front 11A oz bare Fox 50 fills need energetic user friendly Fox 45 has stretched give extra torque necessary handle 11 prop authority retains its user friendly nature technically minded some pertinent data Bore Stroke Schneurle ported double ball bearing course The crankshaft machined piece SAE 86L20 steel surface hardened tempered crankpin ground before heat treat retain its hard skin The piston cast low expansion 390 alloy fitted free floating piston ring made patented process The 7/32 dia tubular wrist pin retained unique rollpin retaining system results considerable increase bearing area corresponding increase life cylinder hardened steel carefully tapered crossbotched bore sturdy connecting rod machined high strength aluminum bar fitted bronze bushing both ends The cylinder head uses two piece button design results accurate combustion chamber piece casting also has much stronger glow plug thread The crankcase pressure cast 384 alloy considerably stronger alloys manufacturers use Also design utilizes patented high back door feature resists compression stresses better conventional design BUY AND FLY ONE YOU WILL BE HAPPY WITH IT Fox motor test run factory checked idle full power throttla response compression Only motors meet performance standardr sold Most competitors reluctant spend time money check run motors risk spoiling exterior appearance thinli important motors run well finest motor world no good part broken cant get another Fox owners can get part promptly calling 501-646-1656 giving us motot size part name number Visa Mastercard number Duke Fox has building model airplane motors USA since 1943 Labor 100% American material except ball bearings Americar made MANUFACTURING 5305 TOWSON AVENUE FORT SMITH AR 72901 - - _________ PHONE 501 6461656 About three layers 2-oz glass cloth epoxy gives right combination light ness strength cowling will never crack vibration Unlike procedure making can opy foam must melted out cowling make room engine used dope thinner However thinner can cause severe discomfort fire hazard boot Use out doors extreme care An alternative method dig foam out knife cowling mounted small hard wood blocks glued firewall about % edge Use blocks desired long keep out way controls lines engine Very small countersunk wood screws used hold cowling place front former cowling can cut out clear throttle arm Dont cut away too much will rattle run engine Covering finishing MonoKote used prototypeorange fuse lage tail transparent red wings color scheme up sure make easy see small fast model flying away will quickly shrink dot ether want stand out vividly possible Covering model after assembly rather before little trou ble eliminates worry MonoKote between various pieces could interfere glue joints cowling can painted match MonoKote can prime fiberglass Ambroid cement MonoKote cowling fact though its obsolete general model building pur poses Ambroid will wonders making MonoKote stick epoxy firewalls wing center sections Radio engine Radio installation Sparrow tight managed fit old Tower Hobby System 4 radio mon ster servos full-size battery pack smaller radio will give better perform ance easier time installa tion Use battery position balance model can strongly recommend pushrods made wood Nyrod pushrods change length dif ferent temperatures small model can make unacceptable trim changes Dont use servo tape install flight control servos first time around installed Enya 15 plain bearing engine prototype provided enough power liftoff about 40 ft flight 50 mph range pulled vertical model quickly slowed down piloted smoothly airplane would vertical figure eight bigger engine clearly called improve vertical performance Replacing 15 Fox 25 plain bearing engine made difference hoped Upon command model would Continued page 133 s old timer perfeCtly pmportioned modeling Curtiss Robin 049 EngInes -Channel RIC 41 WIngspan ElectrIc Power Optional 82296 00 e03 Very tee lull scale aircraft ideally suited model olast s appealing aid curtiss Robin born spruce linen age beaatifally proportioned rubber electric glow engines Easy fan build trainerlike pertormanca Flyline Models Catalog 505 P5ono 17031 273-0503 FLYLINE MODELS INC PO Sos 2136 Palrtax VirgInia 22031 USA September 1988 37 ONLY 129Y5 INCLUDING SPINNER AND TILT DOWN MUFFLER ITEM NO 25000 Some things should consider comparing Fox 50 other brands ROCKET PLANE xP-1 Valley View Dr Box 43 716 372-8406Allegany NY 14706 Sparrow/Gardner Continued page 37 now dart straight up almost out sight happen have hot 15 20 will fine Please resist urge put 40 model Youd have rebalance airplane point would scarcely flyable unless engine three-quarters full throttle over burdened model would also very hard land Flying Careful trimming will help get out Sparrow Start about 3A5 aileron throw % ele vator throw 1 rudder throw Bal ance model point about % in front center-of-gravity plans Fly way several flights before change anything Quick isnt youll get used after few flights Once feel comfortable model can wring out bit begin get timing right move balance point back indi cated plans will make mod el little quicker yet will also release its snapping spinning potential Snapping maneuvers Sparrows strongest suit airplane will perform two full inside outside vertical snaps still heading straight up afterwards can partial snaps precision Granted intricate tricks like gliding three quarters outside snap knife-edge flight hard learn airplane happy doing Once have sharp ened timing youll find possi bilities almost limifless youre quick enough stirring sticks chances Sparrow will almost ma neuver days hauling flying larger model doesnt seem worth trouble model like Sparrow can really help keep edge Fly singular things alone can model isnt taken seriously least right off bat improvement flying skills definitely will Radio Technique/Myers Continued page 39 Hams required listen before transmit tends limit RE interference no guarantees Any quiet spot band can used Ham operator Charging ahead used Pacific Plan dis tribute Ham-band RC0O-09 channels shown Table 4 because 20-kHz raster because expect cur rent users can obtain Gold Sticker performance Hams should get together group insist moving everything Gold Sticker soon possible tainly 1991 AMA permits even-numbered chan nels sanctioned events Hams lib erty use 10 right now park makes Gold Sticker performance neces sary safe operation 53 MHz six-meter distribution Table 5 per Pacific Plan may neces sary due 100 kHz raster Replacing transmitter batteries times have noticed transmitter out put meter reads lower usual and/or operating time shorter used common problem cell bat tery pack has developed short circuit transmitter still under warranty probably send back manufacturer wait may out warranty and/or dont want wait Decision time find replace bad cell re place whole pack order make decision must re move pack transmitter Step disconnect pack mistakes can make working electronic circuit least forgivable damage components cause too lazy disconnect power supply momentary short circuit wrong place can destroy transmitters electronics So unplug battery pack can cut both wires cant simple matter put Deans connectors 19K54 $155 Ace RIC Inc Box 511E Higginsville MO 64037 cut ends wire want reassemble transmit ter Match wire colors install Deans connectors making sure male plug side transmitter pull pins out isolated contact provide means quick visual check connecting battery pack polarity reversed matter polarity Practically everyone uses Red k y Sribnick told particular case PCM trans mitters Futaha JR Red wire charger k wire meter necessary tool working batteriesand dont assume anything Now have pack hand put number cell using pen paper stick ers attach 20-ohm 10-watt resistor pack monitor voltage cell pack discharging Write down voltages cell five-minute intervals Keep discharg ing pack until cell reads 0 VDC Leave resistor connected wont hurt anything Looking list voltages will tell cells shorted start 0 VDC whether pack balanced cells get 0 VDC about same moment unbalanced dont pack unbalanced remove resistor charge pack overnight re peat test pack still unbalanced suggestion junk because another cell probably going fail Ace R/C sells kinds Ni-Cds probably can supply what needContinued page 134 SPECIALISTS IN CUSTOM COX TEE DEE & REED ENGINES 020S 049 051S & 09S ALL CUSTOM & STOCK PARTS AVAILABLE INDIVIDUALLY MANY NEW PARTS FOR OLD DISCONTINUED COX ENGINES COX PROPS & GLOW HEADS COMPETITION ACCESSORIES & CUSTOMIZED K&B ENGINES ALSO COMPLETE LINE OF RACING PARTS - GLO-BEE FIREBALL & K&B PLUGS SOLID LINES RACING WHEELS QUICK FILLS ETC WE ALSO STOCK CARBON FIBER KLOTZ OIL LATEX & SILICONE FUEL TUBING PEN BLADDER MATERIALS & HARDTO-FIND HARDWARE ESPECIALLY 2-56 & 3-48 SIZES COILS CONDENSERS NGK & STIlT PLUGS SILK 12 COLORS QUALITY DOPE BRUSHES 5 & 7 LOOP RUBBER BANDS KSB SEELIG & IGNITION TIMERS GAS & DIESEL FUEL TUBING TRANSISTOR IGNITION SYSTEMS RESISTOR HI-TENSION LEADS 1/2A TEXACO PLAYBOY SR KIT 1/2A TEXACO ENGINES & PARTS EVERYTHING YOU NEED FOR OLD TIMER EVENTS September 1988 133 TABLE 4 50 MHz Ham Band AircraftlSurfacelOommunications Uses ARRL band plan recognizes assignment RC StalionABCDE 20-kHz raster0003010402 0705080609 OUR REV-UP INVENTORY AVERAGES OVER 9000 PROPS I! CALL FOR IMMEDIATE SHIPMENT ON VISA OR MASTERCARD TABLE 5 6-Meter Ham Band Ai rcraft/Surface/CommuniCationS Uses 100-kHz raster Sta ABCDE 533531534532535 536537538 OLD TIMER SUPPLIES ORDER BY MAIL OR PHONE 619728-4365 SORRY NO COD VISA & MASTERCARD WELCOME DEALER INQUIRES INVITED MINIMUM MERCHANDISE ORDER $1000 SHIPPING & HANDLING FEE $150 FOR INSURANCE ADD $100 ORDERS SHIPPED WITHIN 24 HOURS S ADD 6% TAX
Edition: Model Aviation - 1988/09
Page Numbers: 26, 27, 28, 29, 30, 32, 34, 36, 37, 133
HAVE YOU BUILT small models lately answer follow ing questions yes read lighter scaled-down airplane may just what need right now have spend first hour flying field hands knees assem bling newest 60-powered wonderbird equipped tuned pipe Have ever passed over trip flying field because didnt want go trouble haul ing assembling feeding large model myself have passed up trips field no other reason down about quart glow fuel know quart fuel wont fly model long enough make trip worth right Franidy opinion large models can pain nuisance Propellers run $2 apiece break look wrong Having purchase MonoKote four rolls time Trips flying field awkward best downright uncom fortable worst disassembled cumbersome airplanes take up much room car someone must either hold engine lap hold tail keep blocking drivers line sight rearview mirror did ever notice much farther big models scatter break bigger harder fall certainly holds true flying field Larger models just have wider radius catastrophe Well ever build large models Simply because worth size weight allow fly graceflilly gently easily small models theres no remedy As rule larger models have light er wing loadings due scale effects retain good flight characteristics very high wing loadings cant argue bigger better Scale building Big engines seem easier adjust buy last longer Radios fit right want still leave plenty room other things such re tractable landing gear smoke system Big planes simply have air being serious respectable little ones Brawny appearance isnt everything though Oddly enough sophisti cated models know happen lightestthe Indoor microfilm models Al26 Model Aviation Top Although model quick large horizontal stabilizer prevents having nasty habits other little models bright colors help eyes stay locked onto small high-speed target Aside being fun main objective model hone piloting skills doing minimum Investment money aggravation Take things slowly first few flights sure keep plenty air under trying out new maneuvers S PARROW DESIGNED BY STEVE GARDNER FIBERGLASS COWL SPRUCE SffiRS IN3/3z BALSR RI5 /x FI TESTOCK ILSR STRIP rBRLSA3HEET N- BLSP SHEEJ 25 ENGINE N 7 ZDIA SPINNER 1DiA 1IL WHEEL CE &LSA HATCH 5QMAPLE LANDING GEAR BLOCK4ll j DIR MUSIC WIRE LE- Left Remove prop five sheet metal screws have easy access tne engine tuel tank battery pack engine problems really problems fuel system important have easy access fuel tank Right height firewall makes cowl 15-size engine appear short height front allows larger engines longer cowlings used looking odd Left Our author says has always preferred belicranks actuate ailerons because have least amount play system available also allow aileron servo mounted flat wing save space Right hold thin wire landing gear groove nylon straps slanted puts screw head closer wire applies pressure directly wire though dont say words devotees big models often think smaller-scale airplanes little better toys So big models imposing flying field have other virtues smaller craft offer different compensations lighter birds often very distinctive flying challenges modeler ways big ones dont Small models antidote complacency can stand taken seriously youre game piloting ship will fly smoothly unless fly smoothly reaction time up smaller airplanes unruly manners might just ready think small might just ready sacrifice prestige ease big prepossessing models ex citement knowing youve learned handie airplane competently well youre weary lugging around support gear big model little guy definitely ticket need starting battery pint fuel trans mitter youre ready go Because smaller plane will fit cars having disassembled no tools needed pint fuel will keep air four 10-minute flights smaller model will bounce larger would shatter Above said before lighter bird will keep toes Small models have characteris tic twitchiness dont want fly smooth ly nervous giddy machines al ways quick translate control input abrupt change flight path what amounts much greater con trol authority pilotextra maneuver ability motivated flier can use good advantage practice can learn orchestrate intricate maneuvers can gotten larger airplane fact can learn fly Sparrow smoothly youll able handle anything larger precision never knew Little airplanes train reflexes better fastest video games low inertia models makes possible cer tain maneuvers forbidden larger ones Sparrow will snapping maneu vers like no other airplane have ever flown can start stop snaps literally instan taneously once have required tim ing Eight-sided loops easy too corners sharp Finally smaller models easier build up certain strength Like early Grumman fighters Sparrow de signed nearly indestructible flight Although its slightest overbuilt airplane allows enter abrupt ma neuvers much higher speeds might larger model Its light weight low inertia permit rapid-fire succes sion maneuvers despite its low drag comes time slow down Spar row will lose speed rapidly rather like having built-in glide path control Larger aircraft still rule flying field smaller birds complement nicely could certainly worse build Sparrow stable models learn put want skills control authority youll de velop maneuvering airplane guar anteed carry over flying Construction standard practice build tail surfaces first sort warm-up Tail surfaces easy build too demanding theyre fairly painless way get modeling mood tail surfaces shouldnt carefully constructed rest 28 Model Aviation /4 DIA DOWEL IL SOFT BALSA BLOCK HOLLOWED WING TIPWING PLAN TOP VIEW1/L4 SPRUCE DOUOER CENTER ALL WING SHEETING1/2 ESECT IS 1/16 BALSALG BLOCKS-if -2AV~fl [v32][b-1-10-1-10]] ALL BiC BRACE III/BPLY 1/BPLYDIIEDRAL B MOUNTBRACE ___IW9W __K7 — __- W3W-2 __-U 1 0 WING DIHEDRALAILERON- 3/4 AT EACH TIPHORN1/4 BALSA SHEPTCENTER SECT COVERED I/B BALSADOWEL RETAINERWITH 2 OZ FIBERGLASS -0 Ki7[11ISUB-SPAR HINGEIz3/8 BALSA 3/16 HARD BALSALOCATIONT E STOCK FILL I/B PLY C L FORMER C 1/4 BALSA1/4 TRI SHEETSTOCK P2 Fl F-I S F2 1/16 PLY ____ACE 1/B PLY PLATE IN HATCH FOR HATCHMOUNTING SCREW 1/4 TRI W NG BO T 1F3MOUNT 1/4 TRI-STOCK CZ-. F-IR COWL IS 2 LAYERS OF 6 OZ FIBER GLASS / _____ TYPICAL HARDWOOD/1/8 HD BALSA FUSELAGE BOTTOM COWL MOUNTLBxI/4TYP HARD- WING SADDLEVIEW WOOD HATCH MOUNT BLOCKGLASS COVERED FOAM OR CLEAR COMMERCIAL CANOPY I/B MED BALSA P3FUSELAGE SIDES1/4 TRI-STOCK HO WOOD 7/BLOCK IF-4 2 DA SP NNER ______________________ I/B HO BALSA .5rzz* G SADDLE i ALL RIBS ARE ----..3/32 BALSA SHEET MEDIUM 1/B MED BALSA FUSE SIDES P4 1/4BALSA- SHEET~i STABILIZER ___-—ELEVATORHINGE TO SUIT I/4DOWEL/4 BALSA SHEET 1/8 BALSA1/B PLY GUSSETMOUNT ii7~ ~2I 1/4 BALSA SHEET ___________________IL LIGHT 1/B BALSA SI-EET BOTTOM OMITTED FOR CLARITY7I 1/4 TRI-1/x STOCK/4 BALSA SA STRIP ______/OUTLINES TRI- STOCK 7I' FINRUD \\ 1/4 BALSA SHEET TOP/ I/4BALSA VERY LIGHT 4 4 NYLONSTRIP FORMER1/B BALSA SHEET LSHARDWOODBOLTI/B BALSACROSS GRAIN PLBLOCKSUGHTSHEET BALSA1/8 DIA OS FSR 25V4UIBBLOCKMUSIC WIREFUSELAGE SIDE VIEW ENGINESPRUCELIGHT BALSA BLOCK HATCH 2 DIA WHEELSFull-Size Plans Available See Page 178 /4 BALSA SHEET 1/4 TRI 4K 1/B MED I/B PLY I/B PLY 0I2 345 6 MODEL AVIATION SPARROW DESIGNED BY STEVE GARDNER TRACING BY OE DEMARCO ALL RIGHTS RESERVED Left A dog-leg wire elevator push rod model small mistake would big 60-powered job careful make cross leg short possible sure longer sections parallel Right Control surfaces may seem too small first glance adequate conceivable maneuver keep hinge gaps small possible maximum efficiency model its just arent very hard build correctly critical step constructing airplanes tail proper choice wood gram build tail will add about five grams weight fin ished model Overbuilding will force compensate extra nose weight Worse still may try fly adding extra weight Add extra nose weight performance suffers Sidestep problem model wont fly Obviously building tail too heavy puts quandary best avoided ideal wood Sparrow tail surfacesbalsa 6- 8-lb-per-cu-ft classeliminates need add nose weight However form need balsa usually hard find Whats wanted stiff firm grade bal sa punky material feels like Styrofoam type balsa also wood choice building Hand-Launched Glider wings Free Flighters hoard like treasure mentioning possibility getting some stuff Free Flighter would probably fool hardy Dont try substitute 3A6-in balsa A-in thickness specified plans extra thickness needed lend adequate stiffness horizontal stabilizer ra tionale based having seen just about stab failures wing failures stabilizers get pounding flight theyre also subject getting hung door jambs trunk lids because promi nence Stabs built A-in balsa can stand abuse wont come apart until break off against ground As shown plans Ive made up edges fin rudder using strips grain running parallel edge purpose simply make edges easier round well help hold tail straight Since pieces A-in balsa small tend warp toO badly strips optional save having round end grain surfaces cant well enough suit stan dards use strips elevators joined either strip hardwood dowel square fiber glass cloth may folded over dowel leading edge elevator rein force joint will also strengthen area elevator horn mounted Trim cloth away slot 30 Model Aviation fuselage resist urge make slot elevator smaller Although clearance may seem excessive now can quickly become inadequate tail gets wet fuselage swells just tad situation elevator will jamand happens flight over maybe good Sand leading edges rudder elevator housetop-shaped point set hinges wood until hinge pin centerlines point housetop will allow leave very small gap hinge line MonoKote hinges may used preferred because particular geometry might necessary enlarge hole fuse lage order clear greater motion elevator joiner Fuselage Underestimating structural importance fuselage seems fairly common error among modelers Ap parently such builders assume func tion fuselage merely hold wing tail proper juxtaposition oversimplification Any part model exposed airflow has impact performance reality Continued page 32 Left If use older large radio like installation will tight impossible Using smaller servos ana u mn Dattery pack makes things easier saves weight Right Mounting aileron servo flat wing gives room between other servos ORDERS SHIPPED DAY RECEIVED WARBIRD VIDEOS VHS OR BETA OUR 23RD YEAR SPE6IA[ IWTRODO6IORY OFFER WARBIRD CHECKOUT VOL 1 Flying P-40 Warhawk Corsair Hellcat SB2-A Buccanneer Avenger NF 1325 Programs2 Hr Only $3995 ANY TWO VIDEOS ONLY $7595 ANY 3 VIDEOS ONLY $10795 AILS VIDEOS ONLY $19995 WARBIRD CHECKOUT VOL 11 Flying P-38 Mitchell Bomber P61 Black Widow Invader NF 1454 Programs100 Mm Only $3995 WARBIRD CHECKOUT VOL III Flying P-51 Mustang A-20 Bomber P-39 Introduction P-39 Advanced NF 1514 Programslb Mm Only $3995 CALL TOLL FREE IT CARDS LJ Day Night California outside USA Shipping Paid Continental USForeign add $500nts add 6 1/2% tax NF VIDEO LIBRARY 13470 WASHINGTON BLVD STE 207 MARINA DEL REY CA 90292 fuselage has much greater effect average modeler credits As fin rudder effect primarily flight direction fuse lage has exposed area fin rudder no matter what input give airplane swaybacked fuse lage will never fly straight enough suit model has crooked fuselage will fly straight speed trim will Because very tall narrow fuselage Sparrow actually functions like flight surface allowing plane perform knifeedge flight gracefully larger models its particularly important build straight mild bend fuselage sides facilitates very careful choos ing wood two sides dont have equal degree springiness fu selage almost fated come out crooked Start making up left right side wing saddle doublers spruce tank hatch strips pieces installed before sides joined intend install engine larger 19 engine have mind very hot before assembling fuse lage sides might fiberglass inside forward area say wing doubler up 6-oz glass cloth Hot Stuff isnt necessary stay engine-size limits dictated design have never yet seen model some didnt eventually subject over sized engine firewall made up two layers %-in ply Glue together installa tion later Drill hole wing dowel No 3 former have favorite method locating hole follow location specified plans exactly Slight incidence misalignments may scarcely noticed larger model will very detrimental model small Make cutouts No 4 former through pushrods extend rear model Adapt parameters cutouts shown plans suit radio necessary dont weaken area wing bolt block attaches Af ter have decided cutout patterns made sure formers configured radio glue No 3 4 formers fuselage sides Use triangle get formers square side other side glued top fu selage laid flat workbench Draw two sides together form tail very careful twists get built fuselage can traced operation Glue firewall using epoxy fast-setting glues have much improved last few years serve well purposes have better luck epoxy very high-vibration applications top block made very light A-in balsa sheet punky stuff took pains avoid building tail fine long its extremely light Dont hollow out unless unable oh32 Model AviationContinued page 34 Last An Automatic Full-Feathering Adjustable Pitch Propeller An exclusive patented 4 mechanism lets adjust pitch 8-4O optimum perfor mance blades automa tically feather when motor stops reduce drag give much Recommended 72-80 motor gliders similar models wing 4 loads up 14 ozI sq ft 05 direct e systems 1/ drive shaft Stock No MAO8XXE $2495 Suggested Retail Available Through Leading Distributors WINDSOR PROPELLER CO 384 Tesconi Ct Santa Rosa CA 95401 WARBIRD CHECKOUT VOL V Flying 8-29 Pre-Flightof BI7E Flight 8-24 NF 1553 Programsi 07 Mm Only $3995 WARBIRD CHECKOUT VOL IV Flying P-47 3 parts Flying T-6 3 parts NF 1366 Programslb MIn Only $3995 MODERN JET FIGHTER Flying F/A18 Hornet Eagle 6 F16C nnl Th4 ndohieds AC Custom Aviation Prints Original Pai Custom made photo prints ot several recent Model Builder COVER PAINTINGS Bob Benjamin now available INCLUDING Cl Prints future Model Builder COVER PAINTINGS will also available have something special mind Bob pleased discuss creating new originals custom commission basis ooorplete detale ne ordering prhits Inquire out alginat pairIngs oMI writ Robert Benjamin Aviation Art 1222 26th Ave NE Olympia WA 98506 206 352-2602 Curtiss Jenny * Quality hand-cut kit complete plans rigging scale control setup wire parts pre-bent special hardware included parts individually indentified packaged Decals Major Decal * Engine sizes 20 40 FS 25 TS * Wing unit removes four screws less 3 minutes flying wires left intact * Superb flight characteristics Introductory Price 812500 VISA erCard y Order Michigan residents add 4% sitien tax Add $550 P81 US orders $1250 foreign Video Catalog $1250 post incH VHS/Beta $5 rebate wilt roturn tapo kit ordor Reg catalog sample mini-plan *2 Hand-Cut Quality Affordable Price AERODROME MODELS LTD 2623 S Miller Rd ~__Saginaw Ml 48603 517781-3000 Othor Kits Avaiiabie Aero-Pacer Saby -Pacer Gipsy Moth Rybaby Fiybaby combo Hawkor Hurricane Jester tam wood thats sufficiently light because should have enough mass give stiffness fuselage Glue top block onto fuselage add triangle stock can see plans goes almost everywhere Make tail wheel strut /16 music wire Sew little ply former stall rear fuselage lack steerable tail wheel bothers theres no reason add using favorite method doesnt seem necessary model Add strip balsa uprights crosspieces rear fuselage well wing bolt block its triangle rein forcements Sheet bottom assem bly grain running crosswise Make hatch balsa block small plywood squares inserted inner face Attach wood screws small hardwood blocks added inside nose helps control vibration front model allowing hatch take some structural load nose prototype used two points tachment diagonal corners hatch using four plywood squares works much better easy access fuel tank isnt important youre planning stall engine larger recommended 19 size can skip foregoing just glue hatch place Personally like maintainability separate tank hatch Slot top block fin Doing after fuselage assembled ensures accu rate alignment completed fuselage shaped rounding top block hatch chose round off sharp corners behind wing prototype can wish adding triangle stock canopy Sparrow must very narrow fit properly can find ready-made fills bill means use Being unable find canopy narrow enough used Styrofoam custom make prototype After shaping foam suit give coat 2-oz glass cloth epoxy resin Paint prime canopy match model Since canopy factor determining size fin rudder would unwise 34 Model Aviation include model airplanes knife-edge capabilities might diminished model would behave needed dihedral Wing builder encounters biggest challenge Generally wing hardest part model build right other part model want wing warp-free yet its difficult part build warps want honest-flying Sparrow its wing must straight Ensure its straight warp-free before cover once webbing place wing will twist great extent wing area small old trick straightening wing MonoKote will work very poorly Dont rely Make spar carefully selected straight-grained spruce Using very straight-grained wood protects model coming apart air no matter much beating its given Test sam ple seeing can follow grain layer least 10 find piece straighter grain spar joined unusual manner Two strips spruce scraps left over making spars used double joint between spars center wing installed between top bottom caps just like splints 3A6-in ply plate shaped conform wing spar sweep epoxied place after wing joined wing dowel should glued place before wing sheeted ensure strong bond center ribs A-in balsa pieces side wing no stronger joint very certain its accu racy double-check wing straight before web spar webbing should installed very carefully under great deal strain modelers realize dont want have gaps would need filled glue webbing should run along straight vertical best effect Nothing else gives much strength small weight increase does proper web bing prototype I built up ailerons Continued page 36 ct OO J Power W Products Inc Only certified checks money orders accepted Minimum Order glom three packages 4 Pumerpoles $3 per package $t shipping huodhogi CT residents add 70% sales tao Prices nubiect ohange nofice DEALER INQUIRIES INVITED further information dealer paces send SASE Business Card SERMOS RIC SNAP CONNECTORS~ Celar Canes Si 8ox 16787 Stantad CI 069C203322-6294 pieces trailing edge sheeting cut out make aileron wells could over again would simply make solid balsa have indicated plans weight sav ings turned out almost nonexistent construction much timeconsuming making solid ailerons would have recommend using bellcranks because re careful about rig offer least amount play system wing can accommodate Id think twice about substituting something else airplane needs ailerons center time let go stick little stiffness acceptable Once sheeting place cover center joint 6-oz glass cloth ep oxy resin Hot Stuff cutout servo wing sheeting easier make before center section covered glass wing faired fuselage very light balsa block glued top glass wing block bolts should set fairing until bear wing self used 10-32 nylon bolts proto type because ability break away before wing block does However since nylon bolts difficult find some areas can substitute regular A-20 bolts necessary Assembly Bolt wing place true horizontal stabilizer eye much easier sounds Holding model up nose pointed towards change angle model until stab makes line just above top surface wing Adjust stab until paral lel wing measure top center firewall tips stab get proper alignment indicated plan view fin simply fitted slot top block its alignment will no bet ter slot Use triangle get fin square stab such small model misalignments will have magni fied effect exacting can dur ing assembly cowling built up same way canopy its bit difficult make fit perfectly engine its mount mount model tack glue foam blocks around engine up back spinner Mark foam front locate spinner circle Gently remove foam take engine mount off model preserve location spinner circle tack foam back onto model exactly broke off Glue front cowl former onto foam Carve sand foam shape prefer try fancier shape prototype keep lines simple will look odd Remove cowl form model cut off about / out side edge foam back cowl allow thickness fiberglass 36 Model Aviation SNAP POINT KNIFE SAMPLE Blade Included Send $125 Stamps 5/25s please Write Complete Price List Berkeley Trading Co PO Box 26- Dept HB Berkeley Springs WV 25411 258-2 773 THE FOX 50 HERE Light enough 40 size airplanes Powerful enough 60 size airplanes * * * * often have wished little power 40 size model couldnt see potting big heavy 60 up front 11A oz bare Fox 50 fills need energetic user friendly Fox 45 has stretched give extra torque necessary handle 11 prop authority retains its user friendly nature technically minded some pertinent data Bore Stroke Schneurle ported double ball bearing course The crankshaft machined piece SAE 86L20 steel surface hardened tempered crankpin ground before heat treat retain its hard skin The piston cast low expansion 390 alloy fitted free floating piston ring made patented process The 7/32 dia tubular wrist pin retained unique rollpin retaining system results considerable increase bearing area corresponding increase life cylinder hardened steel carefully tapered crossbotched bore sturdy connecting rod machined high strength aluminum bar fitted bronze bushing both ends The cylinder head uses two piece button design results accurate combustion chamber piece casting also has much stronger glow plug thread The crankcase pressure cast 384 alloy considerably stronger alloys manufacturers use Also design utilizes patented high back door feature resists compression stresses better conventional design BUY AND FLY ONE YOU WILL BE HAPPY WITH IT Fox motor test run factory checked idle full power throttla response compression Only motors meet performance standardr sold Most competitors reluctant spend time money check run motors risk spoiling exterior appearance thinli important motors run well finest motor world no good part broken cant get another Fox owners can get part promptly calling 501-646-1656 giving us motot size part name number Visa Mastercard number Duke Fox has building model airplane motors USA since 1943 Labor 100% American material except ball bearings Americar made MANUFACTURING 5305 TOWSON AVENUE FORT SMITH AR 72901 - - _________ PHONE 501 6461656 About three layers 2-oz glass cloth epoxy gives right combination light ness strength cowling will never crack vibration Unlike procedure making can opy foam must melted out cowling make room engine used dope thinner However thinner can cause severe discomfort fire hazard boot Use out doors extreme care An alternative method dig foam out knife cowling mounted small hard wood blocks glued firewall about % edge Use blocks desired long keep out way controls lines engine Very small countersunk wood screws used hold cowling place front former cowling can cut out clear throttle arm Dont cut away too much will rattle run engine Covering finishing MonoKote used prototypeorange fuse lage tail transparent red wings color scheme up sure make easy see small fast model flying away will quickly shrink dot ether want stand out vividly possible Covering model after assembly rather before little trou ble eliminates worry MonoKote between various pieces could interfere glue joints cowling can painted match MonoKote can prime fiberglass Ambroid cement MonoKote cowling fact though its obsolete general model building pur poses Ambroid will wonders making MonoKote stick epoxy firewalls wing center sections Radio engine Radio installation Sparrow tight managed fit old Tower Hobby System 4 radio mon ster servos full-size battery pack smaller radio will give better perform ance easier time installa tion Use battery position balance model can strongly recommend pushrods made wood Nyrod pushrods change length dif ferent temperatures small model can make unacceptable trim changes Dont use servo tape install flight control servos first time around installed Enya 15 plain bearing engine prototype provided enough power liftoff about 40 ft flight 50 mph range pulled vertical model quickly slowed down piloted smoothly airplane would vertical figure eight bigger engine clearly called improve vertical performance Replacing 15 Fox 25 plain bearing engine made difference hoped Upon command model would Continued page 133 s old timer perfeCtly pmportioned modeling Curtiss Robin 049 EngInes -Channel RIC 41 WIngspan ElectrIc Power Optional 82296 00 e03 Very tee lull scale aircraft ideally suited model olast s appealing aid curtiss Robin born spruce linen age beaatifally proportioned rubber electric glow engines Easy fan build trainerlike pertormanca Flyline Models Catalog 505 P5ono 17031 273-0503 FLYLINE MODELS INC PO Sos 2136 Palrtax VirgInia 22031 USA September 1988 37 ONLY 129Y5 INCLUDING SPINNER AND TILT DOWN MUFFLER ITEM NO 25000 Some things should consider comparing Fox 50 other brands ROCKET PLANE xP-1 Valley View Dr Box 43 716 372-8406Allegany NY 14706 Sparrow/Gardner Continued page 37 now dart straight up almost out sight happen have hot 15 20 will fine Please resist urge put 40 model Youd have rebalance airplane point would scarcely flyable unless engine three-quarters full throttle over burdened model would also very hard land Flying Careful trimming will help get out Sparrow Start about 3A5 aileron throw % ele vator throw 1 rudder throw Bal ance model point about % in front center-of-gravity plans Fly way several flights before change anything Quick isnt youll get used after few flights Once feel comfortable model can wring out bit begin get timing right move balance point back indi cated plans will make mod el little quicker yet will also release its snapping spinning potential Snapping maneuvers Sparrows strongest suit airplane will perform two full inside outside vertical snaps still heading straight up afterwards can partial snaps precision Granted intricate tricks like gliding three quarters outside snap knife-edge flight hard learn airplane happy doing Once have sharp ened timing youll find possi bilities almost limifless youre quick enough stirring sticks chances Sparrow will almost ma neuver days hauling flying larger model doesnt seem worth trouble model like Sparrow can really help keep edge Fly singular things alone can model isnt taken seriously least right off bat improvement flying skills definitely will Radio Technique/Myers Continued page 39 Hams required listen before transmit tends limit RE interference no guarantees Any quiet spot band can used Ham operator Charging ahead used Pacific Plan dis tribute Ham-band RC0O-09 channels shown Table 4 because 20-kHz raster because expect cur rent users can obtain Gold Sticker performance Hams should get together group insist moving everything Gold Sticker soon possible tainly 1991 AMA permits even-numbered chan nels sanctioned events Hams lib erty use 10 right now park makes Gold Sticker performance neces sary safe operation 53 MHz six-meter distribution Table 5 per Pacific Plan may neces sary due 100 kHz raster Replacing transmitter batteries times have noticed transmitter out put meter reads lower usual and/or operating time shorter used common problem cell bat tery pack has developed short circuit transmitter still under warranty probably send back manufacturer wait may out warranty and/or dont want wait Decision time find replace bad cell re place whole pack order make decision must re move pack transmitter Step disconnect pack mistakes can make working electronic circuit least forgivable damage components cause too lazy disconnect power supply momentary short circuit wrong place can destroy transmitters electronics So unplug battery pack can cut both wires cant simple matter put Deans connectors 19K54 $155 Ace RIC Inc Box 511E Higginsville MO 64037 cut ends wire want reassemble transmit ter Match wire colors install Deans connectors making sure male plug side transmitter pull pins out isolated contact provide means quick visual check connecting battery pack polarity reversed matter polarity Practically everyone uses Red k y Sribnick told particular case PCM trans mitters Futaha JR Red wire charger k wire meter necessary tool working batteriesand dont assume anything Now have pack hand put number cell using pen paper stick ers attach 20-ohm 10-watt resistor pack monitor voltage cell pack discharging Write down voltages cell five-minute intervals Keep discharg ing pack until cell reads 0 VDC Leave resistor connected wont hurt anything Looking list voltages will tell cells shorted start 0 VDC whether pack balanced cells get 0 VDC about same moment unbalanced dont pack unbalanced remove resistor charge pack overnight re peat test pack still unbalanced suggestion junk because another cell probably going fail Ace R/C sells kinds Ni-Cds probably can supply what needContinued page 134 SPECIALISTS IN CUSTOM COX TEE DEE & REED ENGINES 020S 049 051S & 09S ALL CUSTOM & STOCK PARTS AVAILABLE INDIVIDUALLY MANY NEW PARTS FOR OLD DISCONTINUED COX ENGINES COX PROPS & GLOW HEADS COMPETITION ACCESSORIES & CUSTOMIZED K&B ENGINES ALSO COMPLETE LINE OF RACING PARTS - GLO-BEE FIREBALL & K&B PLUGS SOLID LINES RACING WHEELS QUICK FILLS ETC WE ALSO STOCK CARBON FIBER KLOTZ OIL LATEX & SILICONE FUEL TUBING PEN BLADDER MATERIALS & HARDTO-FIND HARDWARE ESPECIALLY 2-56 & 3-48 SIZES COILS CONDENSERS NGK & STIlT PLUGS SILK 12 COLORS QUALITY DOPE BRUSHES 5 & 7 LOOP RUBBER BANDS KSB SEELIG & IGNITION TIMERS GAS & DIESEL FUEL TUBING TRANSISTOR IGNITION SYSTEMS RESISTOR HI-TENSION LEADS 1/2A TEXACO PLAYBOY SR KIT 1/2A TEXACO ENGINES & PARTS EVERYTHING YOU NEED FOR OLD TIMER EVENTS September 1988 133 TABLE 4 50 MHz Ham Band AircraftlSurfacelOommunications Uses ARRL band plan recognizes assignment RC StalionABCDE 20-kHz raster0003010402 0705080609 OUR REV-UP INVENTORY AVERAGES OVER 9000 PROPS I! CALL FOR IMMEDIATE SHIPMENT ON VISA OR MASTERCARD TABLE 5 6-Meter Ham Band Ai rcraft/Surface/CommuniCationS Uses 100-kHz raster Sta ABCDE 533531534532535 536537538 OLD TIMER SUPPLIES ORDER BY MAIL OR PHONE 619728-4365 SORRY NO COD VISA & MASTERCARD WELCOME DEALER INQUIRES INVITED MINIMUM MERCHANDISE ORDER $1000 SHIPPING & HANDLING FEE $150 FOR INSURANCE ADD $100 ORDERS SHIPPED WITHIN 24 HOURS S ADD 6% TAX
Edition: Model Aviation - 1988/09
Page Numbers: 26, 27, 28, 29, 30, 32, 34, 36, 37, 133
HAVE YOU BUILT small models lately answer follow ing questions yes read lighter scaled-down airplane may just what need right now have spend first hour flying field hands knees assem bling newest 60-powered wonderbird equipped tuned pipe Have ever passed over trip flying field because didnt want go trouble haul ing assembling feeding large model myself have passed up trips field no other reason down about quart glow fuel know quart fuel wont fly model long enough make trip worth right Franidy opinion large models can pain nuisance Propellers run $2 apiece break look wrong Having purchase MonoKote four rolls time Trips flying field awkward best downright uncom fortable worst disassembled cumbersome airplanes take up much room car someone must either hold engine lap hold tail keep blocking drivers line sight rearview mirror did ever notice much farther big models scatter break bigger harder fall certainly holds true flying field Larger models just have wider radius catastrophe Well ever build large models Simply because worth size weight allow fly graceflilly gently easily small models theres no remedy As rule larger models have light er wing loadings due scale effects retain good flight characteristics very high wing loadings cant argue bigger better Scale building Big engines seem easier adjust buy last longer Radios fit right want still leave plenty room other things such re tractable landing gear smoke system Big planes simply have air being serious respectable little ones Brawny appearance isnt everything though Oddly enough sophisti cated models know happen lightestthe Indoor microfilm models Al26 Model Aviation Top Although model quick large horizontal stabilizer prevents having nasty habits other little models bright colors help eyes stay locked onto small high-speed target Aside being fun main objective model hone piloting skills doing minimum Investment money aggravation Take things slowly first few flights sure keep plenty air under trying out new maneuvers S PARROW DESIGNED BY STEVE GARDNER FIBERGLASS COWL SPRUCE SffiRS IN3/3z BALSR RI5 /x FI TESTOCK ILSR STRIP rBRLSA3HEET N- BLSP SHEEJ 25 ENGINE N 7 ZDIA SPINNER 1DiA 1IL WHEEL CE &LSA HATCH 5QMAPLE LANDING GEAR BLOCK4ll j DIR MUSIC WIRE LE- Left Remove prop five sheet metal screws have easy access tne engine tuel tank battery pack engine problems really problems fuel system important have easy access fuel tank Right height firewall makes cowl 15-size engine appear short height front allows larger engines longer cowlings used looking odd Left Our author says has always preferred belicranks actuate ailerons because have least amount play system available also allow aileron servo mounted flat wing save space Right hold thin wire landing gear groove nylon straps slanted puts screw head closer wire applies pressure directly wire though dont say words devotees big models often think smaller-scale airplanes little better toys So big models imposing flying field have other virtues smaller craft offer different compensations lighter birds often very distinctive flying challenges modeler ways big ones dont Small models antidote complacency can stand taken seriously youre game piloting ship will fly smoothly unless fly smoothly reaction time up smaller airplanes unruly manners might just ready think small might just ready sacrifice prestige ease big prepossessing models ex citement knowing youve learned handie airplane competently well youre weary lugging around support gear big model little guy definitely ticket need starting battery pint fuel trans mitter youre ready go Because smaller plane will fit cars having disassembled no tools needed pint fuel will keep air four 10-minute flights smaller model will bounce larger would shatter Above said before lighter bird will keep toes Small models have characteris tic twitchiness dont want fly smooth ly nervous giddy machines al ways quick translate control input abrupt change flight path what amounts much greater con trol authority pilotextra maneuver ability motivated flier can use good advantage practice can learn orchestrate intricate maneuvers can gotten larger airplane fact can learn fly Sparrow smoothly youll able handle anything larger precision never knew Little airplanes train reflexes better fastest video games low inertia models makes possible cer tain maneuvers forbidden larger ones Sparrow will snapping maneu vers like no other airplane have ever flown can start stop snaps literally instan taneously once have required tim ing Eight-sided loops easy too corners sharp Finally smaller models easier build up certain strength Like early Grumman fighters Sparrow de signed nearly indestructible flight Although its slightest overbuilt airplane allows enter abrupt ma neuvers much higher speeds might larger model Its light weight low inertia permit rapid-fire succes sion maneuvers despite its low drag comes time slow down Spar row will lose speed rapidly rather like having built-in glide path control Larger aircraft still rule flying field smaller birds complement nicely could certainly worse build Sparrow stable models learn put want skills control authority youll de velop maneuvering airplane guar anteed carry over flying Construction standard practice build tail surfaces first sort warm-up Tail surfaces easy build too demanding theyre fairly painless way get modeling mood tail surfaces shouldnt carefully constructed rest 28 Model Aviation /4 DIA DOWEL IL SOFT BALSA BLOCK HOLLOWED WING TIPWING PLAN TOP VIEW1/L4 SPRUCE DOUOER CENTER ALL WING SHEETING1/2 ESECT IS 1/16 BALSALG BLOCKS-if -2AV~fl [v32][b-1-10-1-10]] ALL BiC BRACE III/BPLY 1/BPLYDIIEDRAL B MOUNTBRACE ___IW9W __K7 — __- W3W-2 __-U 1 0 WING DIHEDRALAILERON- 3/4 AT EACH TIPHORN1/4 BALSA SHEPTCENTER SECT COVERED I/B BALSADOWEL RETAINERWITH 2 OZ FIBERGLASS -0 Ki7[11ISUB-SPAR HINGEIz3/8 BALSA 3/16 HARD BALSALOCATIONT E STOCK FILL I/B PLY C L FORMER C 1/4 BALSA1/4 TRI SHEETSTOCK P2 Fl F-I S F2 1/16 PLY ____ACE 1/B PLY PLATE IN HATCH FOR HATCHMOUNTING SCREW 1/4 TRI W NG BO T 1F3MOUNT 1/4 TRI-STOCK CZ-. F-IR COWL IS 2 LAYERS OF 6 OZ FIBER GLASS / _____ TYPICAL HARDWOOD/1/8 HD BALSA FUSELAGE BOTTOM COWL MOUNTLBxI/4TYP HARD- WING SADDLEVIEW WOOD HATCH MOUNT BLOCKGLASS COVERED FOAM OR CLEAR COMMERCIAL CANOPY I/B MED BALSA P3FUSELAGE SIDES1/4 TRI-STOCK HO WOOD 7/BLOCK IF-4 2 DA SP NNER ______________________ I/B HO BALSA .5rzz* G SADDLE i ALL RIBS ARE ----..3/32 BALSA SHEET MEDIUM 1/B MED BALSA FUSE SIDES P4 1/4BALSA- SHEET~i STABILIZER ___-—ELEVATORHINGE TO SUIT I/4DOWEL/4 BALSA SHEET 1/8 BALSA1/B PLY GUSSETMOUNT ii7~ ~2I 1/4 BALSA SHEET ___________________IL LIGHT 1/B BALSA SI-EET BOTTOM OMITTED FOR CLARITY7I 1/4 TRI-1/x STOCK/4 BALSA SA STRIP ______/OUTLINES TRI- STOCK 7I' FINRUD \\ 1/4 BALSA SHEET TOP/ I/4BALSA VERY LIGHT 4 4 NYLONSTRIP FORMER1/B BALSA SHEET LSHARDWOODBOLTI/B BALSACROSS GRAIN PLBLOCKSUGHTSHEET BALSA1/8 DIA OS FSR 25V4UIBBLOCKMUSIC WIREFUSELAGE SIDE VIEW ENGINESPRUCELIGHT BALSA BLOCK HATCH 2 DIA WHEELSFull-Size Plans Available See Page 178 /4 BALSA SHEET 1/4 TRI 4K 1/B MED I/B PLY I/B PLY 0I2 345 6 MODEL AVIATION SPARROW DESIGNED BY STEVE GARDNER TRACING BY OE DEMARCO ALL RIGHTS RESERVED Left A dog-leg wire elevator push rod model small mistake would big 60-powered job careful make cross leg short possible sure longer sections parallel Right Control surfaces may seem too small first glance adequate conceivable maneuver keep hinge gaps small possible maximum efficiency model its just arent very hard build correctly critical step constructing airplanes tail proper choice wood gram build tail will add about five grams weight fin ished model Overbuilding will force compensate extra nose weight Worse still may try fly adding extra weight Add extra nose weight performance suffers Sidestep problem model wont fly Obviously building tail too heavy puts quandary best avoided ideal wood Sparrow tail surfacesbalsa 6- 8-lb-per-cu-ft classeliminates need add nose weight However form need balsa usually hard find Whats wanted stiff firm grade bal sa punky material feels like Styrofoam type balsa also wood choice building Hand-Launched Glider wings Free Flighters hoard like treasure mentioning possibility getting some stuff Free Flighter would probably fool hardy Dont try substitute 3A6-in balsa A-in thickness specified plans extra thickness needed lend adequate stiffness horizontal stabilizer ra tionale based having seen just about stab failures wing failures stabilizers get pounding flight theyre also subject getting hung door jambs trunk lids because promi nence Stabs built A-in balsa can stand abuse wont come apart until break off against ground As shown plans Ive made up edges fin rudder using strips grain running parallel edge purpose simply make edges easier round well help hold tail straight Since pieces A-in balsa small tend warp toO badly strips optional save having round end grain surfaces cant well enough suit stan dards use strips elevators joined either strip hardwood dowel square fiber glass cloth may folded over dowel leading edge elevator rein force joint will also strengthen area elevator horn mounted Trim cloth away slot 30 Model Aviation fuselage resist urge make slot elevator smaller Although clearance may seem excessive now can quickly become inadequate tail gets wet fuselage swells just tad situation elevator will jamand happens flight over maybe good Sand leading edges rudder elevator housetop-shaped point set hinges wood until hinge pin centerlines point housetop will allow leave very small gap hinge line MonoKote hinges may used preferred because particular geometry might necessary enlarge hole fuse lage order clear greater motion elevator joiner Fuselage Underestimating structural importance fuselage seems fairly common error among modelers Ap parently such builders assume func tion fuselage merely hold wing tail proper juxtaposition oversimplification Any part model exposed airflow has impact performance reality Continued page 32 Left If use older large radio like installation will tight impossible Using smaller servos ana u mn Dattery pack makes things easier saves weight Right Mounting aileron servo flat wing gives room between other servos ORDERS SHIPPED DAY RECEIVED WARBIRD VIDEOS VHS OR BETA OUR 23RD YEAR SPE6IA[ IWTRODO6IORY OFFER WARBIRD CHECKOUT VOL 1 Flying P-40 Warhawk Corsair Hellcat SB2-A Buccanneer Avenger NF 1325 Programs2 Hr Only $3995 ANY TWO VIDEOS ONLY $7595 ANY 3 VIDEOS ONLY $10795 AILS VIDEOS ONLY $19995 WARBIRD CHECKOUT VOL 11 Flying P-38 Mitchell Bomber P61 Black Widow Invader NF 1454 Programs100 Mm Only $3995 WARBIRD CHECKOUT VOL III Flying P-51 Mustang A-20 Bomber P-39 Introduction P-39 Advanced NF 1514 Programslb Mm Only $3995 CALL TOLL FREE IT CARDS LJ Day Night California outside USA Shipping Paid Continental USForeign add $500nts add 6 1/2% tax NF VIDEO LIBRARY 13470 WASHINGTON BLVD STE 207 MARINA DEL REY CA 90292 fuselage has much greater effect average modeler credits As fin rudder effect primarily flight direction fuse lage has exposed area fin rudder no matter what input give airplane swaybacked fuse lage will never fly straight enough suit model has crooked fuselage will fly straight speed trim will Because very tall narrow fuselage Sparrow actually functions like flight surface allowing plane perform knifeedge flight gracefully larger models its particularly important build straight mild bend fuselage sides facilitates very careful choos ing wood two sides dont have equal degree springiness fu selage almost fated come out crooked Start making up left right side wing saddle doublers spruce tank hatch strips pieces installed before sides joined intend install engine larger 19 engine have mind very hot before assembling fuse lage sides might fiberglass inside forward area say wing doubler up 6-oz glass cloth Hot Stuff isnt necessary stay engine-size limits dictated design have never yet seen model some didnt eventually subject over sized engine firewall made up two layers %-in ply Glue together installa tion later Drill hole wing dowel No 3 former have favorite method locating hole follow location specified plans exactly Slight incidence misalignments may scarcely noticed larger model will very detrimental model small Make cutouts No 4 former through pushrods extend rear model Adapt parameters cutouts shown plans suit radio necessary dont weaken area wing bolt block attaches Af ter have decided cutout patterns made sure formers configured radio glue No 3 4 formers fuselage sides Use triangle get formers square side other side glued top fu selage laid flat workbench Draw two sides together form tail very careful twists get built fuselage can traced operation Glue firewall using epoxy fast-setting glues have much improved last few years serve well purposes have better luck epoxy very high-vibration applications top block made very light A-in balsa sheet punky stuff took pains avoid building tail fine long its extremely light Dont hollow out unless unable oh32 Model AviationContinued page 34 Last An Automatic Full-Feathering Adjustable Pitch Propeller An exclusive patented 4 mechanism lets adjust pitch 8-4O optimum perfor mance blades automa tically feather when motor stops reduce drag give much Recommended 72-80 motor gliders similar models wing 4 loads up 14 ozI sq ft 05 direct e systems 1/ drive shaft Stock No MAO8XXE $2495 Suggested Retail Available Through Leading Distributors WINDSOR PROPELLER CO 384 Tesconi Ct Santa Rosa CA 95401 WARBIRD CHECKOUT VOL V Flying 8-29 Pre-Flightof BI7E Flight 8-24 NF 1553 Programsi 07 Mm Only $3995 WARBIRD CHECKOUT VOL IV Flying P-47 3 parts Flying T-6 3 parts NF 1366 Programslb MIn Only $3995 MODERN JET FIGHTER Flying F/A18 Hornet Eagle 6 F16C nnl Th4 ndohieds AC Custom Aviation Prints Original Pai Custom made photo prints ot several recent Model Builder COVER PAINTINGS Bob Benjamin now available INCLUDING Cl Prints future Model Builder COVER PAINTINGS will also available have something special mind Bob pleased discuss creating new originals custom commission basis ooorplete detale ne ordering prhits Inquire out alginat pairIngs oMI writ Robert Benjamin Aviation Art 1222 26th Ave NE Olympia WA 98506 206 352-2602 Curtiss Jenny * Quality hand-cut kit complete plans rigging scale control setup wire parts pre-bent special hardware included parts individually indentified packaged Decals Major Decal * Engine sizes 20 40 FS 25 TS * Wing unit removes four screws less 3 minutes flying wires left intact * Superb flight characteristics Introductory Price 812500 VISA erCard y Order Michigan residents add 4% sitien tax Add $550 P81 US orders $1250 foreign Video Catalog $1250 post incH VHS/Beta $5 rebate wilt roturn tapo kit ordor Reg catalog sample mini-plan *2 Hand-Cut Quality Affordable Price AERODROME MODELS LTD 2623 S Miller Rd ~__Saginaw Ml 48603 517781-3000 Othor Kits Avaiiabie Aero-Pacer Saby -Pacer Gipsy Moth Rybaby Fiybaby combo Hawkor Hurricane Jester tam wood thats sufficiently light because should have enough mass give stiffness fuselage Glue top block onto fuselage add triangle stock can see plans goes almost everywhere Make tail wheel strut /16 music wire Sew little ply former stall rear fuselage lack steerable tail wheel bothers theres no reason add using favorite method doesnt seem necessary model Add strip balsa uprights crosspieces rear fuselage well wing bolt block its triangle rein forcements Sheet bottom assem bly grain running crosswise Make hatch balsa block small plywood squares inserted inner face Attach wood screws small hardwood blocks added inside nose helps control vibration front model allowing hatch take some structural load nose prototype used two points tachment diagonal corners hatch using four plywood squares works much better easy access fuel tank isnt important youre planning stall engine larger recommended 19 size can skip foregoing just glue hatch place Personally like maintainability separate tank hatch Slot top block fin Doing after fuselage assembled ensures accu rate alignment completed fuselage shaped rounding top block hatch chose round off sharp corners behind wing prototype can wish adding triangle stock canopy Sparrow must very narrow fit properly can find ready-made fills bill means use Being unable find canopy narrow enough used Styrofoam custom make prototype After shaping foam suit give coat 2-oz glass cloth epoxy resin Paint prime canopy match model Since canopy factor determining size fin rudder would unwise 34 Model Aviation include model airplanes knife-edge capabilities might diminished model would behave needed dihedral Wing builder encounters biggest challenge Generally wing hardest part model build right other part model want wing warp-free yet its difficult part build warps want honest-flying Sparrow its wing must straight Ensure its straight warp-free before cover once webbing place wing will twist great extent wing area small old trick straightening wing MonoKote will work very poorly Dont rely Make spar carefully selected straight-grained spruce Using very straight-grained wood protects model coming apart air no matter much beating its given Test sam ple seeing can follow grain layer least 10 find piece straighter grain spar joined unusual manner Two strips spruce scraps left over making spars used double joint between spars center wing installed between top bottom caps just like splints 3A6-in ply plate shaped conform wing spar sweep epoxied place after wing joined wing dowel should glued place before wing sheeted ensure strong bond center ribs A-in balsa pieces side wing no stronger joint very certain its accu racy double-check wing straight before web spar webbing should installed very carefully under great deal strain modelers realize dont want have gaps would need filled glue webbing should run along straight vertical best effect Nothing else gives much strength small weight increase does proper web bing prototype I built up ailerons Continued page 36 ct OO J Power W Products Inc Only certified checks money orders accepted Minimum Order glom three packages 4 Pumerpoles $3 per package $t shipping huodhogi CT residents add 70% sales tao Prices nubiect ohange nofice DEALER INQUIRIES INVITED further information dealer paces send SASE Business Card SERMOS RIC SNAP CONNECTORS~ Celar Canes Si 8ox 16787 Stantad CI 069C203322-6294 pieces trailing edge sheeting cut out make aileron wells could over again would simply make solid balsa have indicated plans weight sav ings turned out almost nonexistent construction much timeconsuming making solid ailerons would have recommend using bellcranks because re careful about rig offer least amount play system wing can accommodate Id think twice about substituting something else airplane needs ailerons center time let go stick little stiffness acceptable Once sheeting place cover center joint 6-oz glass cloth ep oxy resin Hot Stuff cutout servo wing sheeting easier make before center section covered glass wing faired fuselage very light balsa block glued top glass wing block bolts should set fairing until bear wing self used 10-32 nylon bolts proto type because ability break away before wing block does However since nylon bolts difficult find some areas can substitute regular A-20 bolts necessary Assembly Bolt wing place true horizontal stabilizer eye much easier sounds Holding model up nose pointed towards change angle model until stab makes line just above top surface wing Adjust stab until paral lel wing measure top center firewall tips stab get proper alignment indicated plan view fin simply fitted slot top block its alignment will no bet ter slot Use triangle get fin square stab such small model misalignments will have magni fied effect exacting can dur ing assembly cowling built up same way canopy its bit difficult make fit perfectly engine its mount mount model tack glue foam blocks around engine up back spinner Mark foam front locate spinner circle Gently remove foam take engine mount off model preserve location spinner circle tack foam back onto model exactly broke off Glue front cowl former onto foam Carve sand foam shape prefer try fancier shape prototype keep lines simple will look odd Remove cowl form model cut off about / out side edge foam back cowl allow thickness fiberglass 36 Model Aviation SNAP POINT KNIFE SAMPLE Blade Included Send $125 Stamps 5/25s please Write Complete Price List Berkeley Trading Co PO Box 26- Dept HB Berkeley Springs WV 25411 258-2 773 THE FOX 50 HERE Light enough 40 size airplanes Powerful enough 60 size airplanes * * * * often have wished little power 40 size model couldnt see potting big heavy 60 up front 11A oz bare Fox 50 fills need energetic user friendly Fox 45 has stretched give extra torque necessary handle 11 prop authority retains its user friendly nature technically minded some pertinent data Bore Stroke Schneurle ported double ball bearing course The crankshaft machined piece SAE 86L20 steel surface hardened tempered crankpin ground before heat treat retain its hard skin The piston cast low expansion 390 alloy fitted free floating piston ring made patented process The 7/32 dia tubular wrist pin retained unique rollpin retaining system results considerable increase bearing area corresponding increase life cylinder hardened steel carefully tapered crossbotched bore sturdy connecting rod machined high strength aluminum bar fitted bronze bushing both ends The cylinder head uses two piece button design results accurate combustion chamber piece casting also has much stronger glow plug thread The crankcase pressure cast 384 alloy considerably stronger alloys manufacturers use Also design utilizes patented high back door feature resists compression stresses better conventional design BUY AND FLY ONE YOU WILL BE HAPPY WITH IT Fox motor test run factory checked idle full power throttla response compression Only motors meet performance standardr sold Most competitors reluctant spend time money check run motors risk spoiling exterior appearance thinli important motors run well finest motor world no good part broken cant get another Fox owners can get part promptly calling 501-646-1656 giving us motot size part name number Visa Mastercard number Duke Fox has building model airplane motors USA since 1943 Labor 100% American material except ball bearings Americar made MANUFACTURING 5305 TOWSON AVENUE FORT SMITH AR 72901 - - _________ PHONE 501 6461656 About three layers 2-oz glass cloth epoxy gives right combination light ness strength cowling will never crack vibration Unlike procedure making can opy foam must melted out cowling make room engine used dope thinner However thinner can cause severe discomfort fire hazard boot Use out doors extreme care An alternative method dig foam out knife cowling mounted small hard wood blocks glued firewall about % edge Use blocks desired long keep out way controls lines engine Very small countersunk wood screws used hold cowling place front former cowling can cut out clear throttle arm Dont cut away too much will rattle run engine Covering finishing MonoKote used prototypeorange fuse lage tail transparent red wings color scheme up sure make easy see small fast model flying away will quickly shrink dot ether want stand out vividly possible Covering model after assembly rather before little trou ble eliminates worry MonoKote between various pieces could interfere glue joints cowling can painted match MonoKote can prime fiberglass Ambroid cement MonoKote cowling fact though its obsolete general model building pur poses Ambroid will wonders making MonoKote stick epoxy firewalls wing center sections Radio engine Radio installation Sparrow tight managed fit old Tower Hobby System 4 radio mon ster servos full-size battery pack smaller radio will give better perform ance easier time installa tion Use battery position balance model can strongly recommend pushrods made wood Nyrod pushrods change length dif ferent temperatures small model can make unacceptable trim changes Dont use servo tape install flight control servos first time around installed Enya 15 plain bearing engine prototype provided enough power liftoff about 40 ft flight 50 mph range pulled vertical model quickly slowed down piloted smoothly airplane would vertical figure eight bigger engine clearly called improve vertical performance Replacing 15 Fox 25 plain bearing engine made difference hoped Upon command model would Continued page 133 s old timer perfeCtly pmportioned modeling Curtiss Robin 049 EngInes -Channel RIC 41 WIngspan ElectrIc Power Optional 82296 00 e03 Very tee lull scale aircraft ideally suited model olast s appealing aid curtiss Robin born spruce linen age beaatifally proportioned rubber electric glow engines Easy fan build trainerlike pertormanca Flyline Models Catalog 505 P5ono 17031 273-0503 FLYLINE MODELS INC PO Sos 2136 Palrtax VirgInia 22031 USA September 1988 37 ONLY 129Y5 INCLUDING SPINNER AND TILT DOWN MUFFLER ITEM NO 25000 Some things should consider comparing Fox 50 other brands ROCKET PLANE xP-1 Valley View Dr Box 43 716 372-8406Allegany NY 14706 Sparrow/Gardner Continued page 37 now dart straight up almost out sight happen have hot 15 20 will fine Please resist urge put 40 model Youd have rebalance airplane point would scarcely flyable unless engine three-quarters full throttle over burdened model would also very hard land Flying Careful trimming will help get out Sparrow Start about 3A5 aileron throw % ele vator throw 1 rudder throw Bal ance model point about % in front center-of-gravity plans Fly way several flights before change anything Quick isnt youll get used after few flights Once feel comfortable model can wring out bit begin get timing right move balance point back indi cated plans will make mod el little quicker yet will also release its snapping spinning potential Snapping maneuvers Sparrows strongest suit airplane will perform two full inside outside vertical snaps still heading straight up afterwards can partial snaps precision Granted intricate tricks like gliding three quarters outside snap knife-edge flight hard learn airplane happy doing Once have sharp ened timing youll find possi bilities almost limifless youre quick enough stirring sticks chances Sparrow will almost ma neuver days hauling flying larger model doesnt seem worth trouble model like Sparrow can really help keep edge Fly singular things alone can model isnt taken seriously least right off bat improvement flying skills definitely will Radio Technique/Myers Continued page 39 Hams required listen before transmit tends limit RE interference no guarantees Any quiet spot band can used Ham operator Charging ahead used Pacific Plan dis tribute Ham-band RC0O-09 channels shown Table 4 because 20-kHz raster because expect cur rent users can obtain Gold Sticker performance Hams should get together group insist moving everything Gold Sticker soon possible tainly 1991 AMA permits even-numbered chan nels sanctioned events Hams lib erty use 10 right now park makes Gold Sticker performance neces sary safe operation 53 MHz six-meter distribution Table 5 per Pacific Plan may neces sary due 100 kHz raster Replacing transmitter batteries times have noticed transmitter out put meter reads lower usual and/or operating time shorter used common problem cell bat tery pack has developed short circuit transmitter still under warranty probably send back manufacturer wait may out warranty and/or dont want wait Decision time find replace bad cell re place whole pack order make decision must re move pack transmitter Step disconnect pack mistakes can make working electronic circuit least forgivable damage components cause too lazy disconnect power supply momentary short circuit wrong place can destroy transmitters electronics So unplug battery pack can cut both wires cant simple matter put Deans connectors 19K54 $155 Ace RIC Inc Box 511E Higginsville MO 64037 cut ends wire want reassemble transmit ter Match wire colors install Deans connectors making sure male plug side transmitter pull pins out isolated contact provide means quick visual check connecting battery pack polarity reversed matter polarity Practically everyone uses Red k y Sribnick told particular case PCM trans mitters Futaha JR Red wire charger k wire meter necessary tool working batteriesand dont assume anything Now have pack hand put number cell using pen paper stick ers attach 20-ohm 10-watt resistor pack monitor voltage cell pack discharging Write down voltages cell five-minute intervals Keep discharg ing pack until cell reads 0 VDC Leave resistor connected wont hurt anything Looking list voltages will tell cells shorted start 0 VDC whether pack balanced cells get 0 VDC about same moment unbalanced dont pack unbalanced remove resistor charge pack overnight re peat test pack still unbalanced suggestion junk because another cell probably going fail Ace R/C sells kinds Ni-Cds probably can supply what needContinued page 134 SPECIALISTS IN CUSTOM COX TEE DEE & REED ENGINES 020S 049 051S & 09S ALL CUSTOM & STOCK PARTS AVAILABLE INDIVIDUALLY MANY NEW PARTS FOR OLD DISCONTINUED COX ENGINES COX PROPS & GLOW HEADS COMPETITION ACCESSORIES & CUSTOMIZED K&B ENGINES ALSO COMPLETE LINE OF RACING PARTS - GLO-BEE FIREBALL & K&B PLUGS SOLID LINES RACING WHEELS QUICK FILLS ETC WE ALSO STOCK CARBON FIBER KLOTZ OIL LATEX & SILICONE FUEL TUBING PEN BLADDER MATERIALS & HARDTO-FIND HARDWARE ESPECIALLY 2-56 & 3-48 SIZES COILS CONDENSERS NGK & STIlT PLUGS SILK 12 COLORS QUALITY DOPE BRUSHES 5 & 7 LOOP RUBBER BANDS KSB SEELIG & IGNITION TIMERS GAS & DIESEL FUEL TUBING TRANSISTOR IGNITION SYSTEMS RESISTOR HI-TENSION LEADS 1/2A TEXACO PLAYBOY SR KIT 1/2A TEXACO ENGINES & PARTS EVERYTHING YOU NEED FOR OLD TIMER EVENTS September 1988 133 TABLE 4 50 MHz Ham Band AircraftlSurfacelOommunications Uses ARRL band plan recognizes assignment RC StalionABCDE 20-kHz raster0003010402 0705080609 OUR REV-UP INVENTORY AVERAGES OVER 9000 PROPS I! CALL FOR IMMEDIATE SHIPMENT ON VISA OR MASTERCARD TABLE 5 6-Meter Ham Band Ai rcraft/Surface/CommuniCationS Uses 100-kHz raster Sta ABCDE 533531534532535 536537538 OLD TIMER SUPPLIES ORDER BY MAIL OR PHONE 619728-4365 SORRY NO COD VISA & MASTERCARD WELCOME DEALER INQUIRES INVITED MINIMUM MERCHANDISE ORDER $1000 SHIPPING & HANDLING FEE $150 FOR INSURANCE ADD $100 ORDERS SHIPPED WITHIN 24 HOURS S ADD 6% TAX
Edition: Model Aviation - 1988/09
Page Numbers: 26, 27, 28, 29, 30, 32, 34, 36, 37, 133
HAVE YOU BUILT small models lately answer follow ing questions yes read lighter scaled-down airplane may just what need right now have spend first hour flying field hands knees assem bling newest 60-powered wonderbird equipped tuned pipe Have ever passed over trip flying field because didnt want go trouble haul ing assembling feeding large model myself have passed up trips field no other reason down about quart glow fuel know quart fuel wont fly model long enough make trip worth right Franidy opinion large models can pain nuisance Propellers run $2 apiece break look wrong Having purchase MonoKote four rolls time Trips flying field awkward best downright uncom fortable worst disassembled cumbersome airplanes take up much room car someone must either hold engine lap hold tail keep blocking drivers line sight rearview mirror did ever notice much farther big models scatter break bigger harder fall certainly holds true flying field Larger models just have wider radius catastrophe Well ever build large models Simply because worth size weight allow fly graceflilly gently easily small models theres no remedy As rule larger models have light er wing loadings due scale effects retain good flight characteristics very high wing loadings cant argue bigger better Scale building Big engines seem easier adjust buy last longer Radios fit right want still leave plenty room other things such re tractable landing gear smoke system Big planes simply have air being serious respectable little ones Brawny appearance isnt everything though Oddly enough sophisti cated models know happen lightestthe Indoor microfilm models Al26 Model Aviation Top Although model quick large horizontal stabilizer prevents having nasty habits other little models bright colors help eyes stay locked onto small high-speed target Aside being fun main objective model hone piloting skills doing minimum Investment money aggravation Take things slowly first few flights sure keep plenty air under trying out new maneuvers S PARROW DESIGNED BY STEVE GARDNER FIBERGLASS COWL SPRUCE SffiRS IN3/3z BALSR RI5 /x FI TESTOCK ILSR STRIP rBRLSA3HEET N- BLSP SHEEJ 25 ENGINE N 7 ZDIA SPINNER 1DiA 1IL WHEEL CE &LSA HATCH 5QMAPLE LANDING GEAR BLOCK4ll j DIR MUSIC WIRE LE- Left Remove prop five sheet metal screws have easy access tne engine tuel tank battery pack engine problems really problems fuel system important have easy access fuel tank Right height firewall makes cowl 15-size engine appear short height front allows larger engines longer cowlings used looking odd Left Our author says has always preferred belicranks actuate ailerons because have least amount play system available also allow aileron servo mounted flat wing save space Right hold thin wire landing gear groove nylon straps slanted puts screw head closer wire applies pressure directly wire though dont say words devotees big models often think smaller-scale airplanes little better toys So big models imposing flying field have other virtues smaller craft offer different compensations lighter birds often very distinctive flying challenges modeler ways big ones dont Small models antidote complacency can stand taken seriously youre game piloting ship will fly smoothly unless fly smoothly reaction time up smaller airplanes unruly manners might just ready think small might just ready sacrifice prestige ease big prepossessing models ex citement knowing youve learned handie airplane competently well youre weary lugging around support gear big model little guy definitely ticket need starting battery pint fuel trans mitter youre ready go Because smaller plane will fit cars having disassembled no tools needed pint fuel will keep air four 10-minute flights smaller model will bounce larger would shatter Above said before lighter bird will keep toes Small models have characteris tic twitchiness dont want fly smooth ly nervous giddy machines al ways quick translate control input abrupt change flight path what amounts much greater con trol authority pilotextra maneuver ability motivated flier can use good advantage practice can learn orchestrate intricate maneuvers can gotten larger airplane fact can learn fly Sparrow smoothly youll able handle anything larger precision never knew Little airplanes train reflexes better fastest video games low inertia models makes possible cer tain maneuvers forbidden larger ones Sparrow will snapping maneu vers like no other airplane have ever flown can start stop snaps literally instan taneously once have required tim ing Eight-sided loops easy too corners sharp Finally smaller models easier build up certain strength Like early Grumman fighters Sparrow de signed nearly indestructible flight Although its slightest overbuilt airplane allows enter abrupt ma neuvers much higher speeds might larger model Its light weight low inertia permit rapid-fire succes sion maneuvers despite its low drag comes time slow down Spar row will lose speed rapidly rather like having built-in glide path control Larger aircraft still rule flying field smaller birds complement nicely could certainly worse build Sparrow stable models learn put want skills control authority youll de velop maneuvering airplane guar anteed carry over flying Construction standard practice build tail surfaces first sort warm-up Tail surfaces easy build too demanding theyre fairly painless way get modeling mood tail surfaces shouldnt carefully constructed rest 28 Model Aviation /4 DIA DOWEL IL SOFT BALSA BLOCK HOLLOWED WING TIPWING PLAN TOP VIEW1/L4 SPRUCE DOUOER CENTER ALL WING SHEETING1/2 ESECT IS 1/16 BALSALG BLOCKS-if -2AV~fl [v32][b-1-10-1-10]] ALL BiC BRACE III/BPLY 1/BPLYDIIEDRAL B MOUNTBRACE ___IW9W __K7 — __- W3W-2 __-U 1 0 WING DIHEDRALAILERON- 3/4 AT EACH TIPHORN1/4 BALSA SHEPTCENTER SECT COVERED I/B BALSADOWEL RETAINERWITH 2 OZ FIBERGLASS -0 Ki7[11ISUB-SPAR HINGEIz3/8 BALSA 3/16 HARD BALSALOCATIONT E STOCK FILL I/B PLY C L FORMER C 1/4 BALSA1/4 TRI SHEETSTOCK P2 Fl F-I S F2 1/16 PLY ____ACE 1/B PLY PLATE IN HATCH FOR HATCHMOUNTING SCREW 1/4 TRI W NG BO T 1F3MOUNT 1/4 TRI-STOCK CZ-. F-IR COWL IS 2 LAYERS OF 6 OZ FIBER GLASS / _____ TYPICAL HARDWOOD/1/8 HD BALSA FUSELAGE BOTTOM COWL MOUNTLBxI/4TYP HARD- WING SADDLEVIEW WOOD HATCH MOUNT BLOCKGLASS COVERED FOAM OR CLEAR COMMERCIAL CANOPY I/B MED BALSA P3FUSELAGE SIDES1/4 TRI-STOCK HO WOOD 7/BLOCK IF-4 2 DA SP NNER ______________________ I/B HO BALSA .5rzz* G SADDLE i ALL RIBS ARE ----..3/32 BALSA SHEET MEDIUM 1/B MED BALSA FUSE SIDES P4 1/4BALSA- SHEET~i STABILIZER ___-—ELEVATORHINGE TO SUIT I/4DOWEL/4 BALSA SHEET 1/8 BALSA1/B PLY GUSSETMOUNT ii7~ ~2I 1/4 BALSA SHEET ___________________IL LIGHT 1/B BALSA SI-EET BOTTOM OMITTED FOR CLARITY7I 1/4 TRI-1/x STOCK/4 BALSA SA STRIP ______/OUTLINES TRI- STOCK 7I' FINRUD \\ 1/4 BALSA SHEET TOP/ I/4BALSA VERY LIGHT 4 4 NYLONSTRIP FORMER1/B BALSA SHEET LSHARDWOODBOLTI/B BALSACROSS GRAIN PLBLOCKSUGHTSHEET BALSA1/8 DIA OS FSR 25V4UIBBLOCKMUSIC WIREFUSELAGE SIDE VIEW ENGINESPRUCELIGHT BALSA BLOCK HATCH 2 DIA WHEELSFull-Size Plans Available See Page 178 /4 BALSA SHEET 1/4 TRI 4K 1/B MED I/B PLY I/B PLY 0I2 345 6 MODEL AVIATION SPARROW DESIGNED BY STEVE GARDNER TRACING BY OE DEMARCO ALL RIGHTS RESERVED Left A dog-leg wire elevator push rod model small mistake would big 60-powered job careful make cross leg short possible sure longer sections parallel Right Control surfaces may seem too small first glance adequate conceivable maneuver keep hinge gaps small possible maximum efficiency model its just arent very hard build correctly critical step constructing airplanes tail proper choice wood gram build tail will add about five grams weight fin ished model Overbuilding will force compensate extra nose weight Worse still may try fly adding extra weight Add extra nose weight performance suffers Sidestep problem model wont fly Obviously building tail too heavy puts quandary best avoided ideal wood Sparrow tail surfacesbalsa 6- 8-lb-per-cu-ft classeliminates need add nose weight However form need balsa usually hard find Whats wanted stiff firm grade bal sa punky material feels like Styrofoam type balsa also wood choice building Hand-Launched Glider wings Free Flighters hoard like treasure mentioning possibility getting some stuff Free Flighter would probably fool hardy Dont try substitute 3A6-in balsa A-in thickness specified plans extra thickness needed lend adequate stiffness horizontal stabilizer ra tionale based having seen just about stab failures wing failures stabilizers get pounding flight theyre also subject getting hung door jambs trunk lids because promi nence Stabs built A-in balsa can stand abuse wont come apart until break off against ground As shown plans Ive made up edges fin rudder using strips grain running parallel edge purpose simply make edges easier round well help hold tail straight Since pieces A-in balsa small tend warp toO badly strips optional save having round end grain surfaces cant well enough suit stan dards use strips elevators joined either strip hardwood dowel square fiber glass cloth may folded over dowel leading edge elevator rein force joint will also strengthen area elevator horn mounted Trim cloth away slot 30 Model Aviation fuselage resist urge make slot elevator smaller Although clearance may seem excessive now can quickly become inadequate tail gets wet fuselage swells just tad situation elevator will jamand happens flight over maybe good Sand leading edges rudder elevator housetop-shaped point set hinges wood until hinge pin centerlines point housetop will allow leave very small gap hinge line MonoKote hinges may used preferred because particular geometry might necessary enlarge hole fuse lage order clear greater motion elevator joiner Fuselage Underestimating structural importance fuselage seems fairly common error among modelers Ap parently such builders assume func tion fuselage merely hold wing tail proper juxtaposition oversimplification Any part model exposed airflow has impact performance reality Continued page 32 Left If use older large radio like installation will tight impossible Using smaller servos ana u mn Dattery pack makes things easier saves weight Right Mounting aileron servo flat wing gives room between other servos ORDERS SHIPPED DAY RECEIVED WARBIRD VIDEOS VHS OR BETA OUR 23RD YEAR SPE6IA[ IWTRODO6IORY OFFER WARBIRD CHECKOUT VOL 1 Flying P-40 Warhawk Corsair Hellcat SB2-A Buccanneer Avenger NF 1325 Programs2 Hr Only $3995 ANY TWO VIDEOS ONLY $7595 ANY 3 VIDEOS ONLY $10795 AILS VIDEOS ONLY $19995 WARBIRD CHECKOUT VOL 11 Flying P-38 Mitchell Bomber P61 Black Widow Invader NF 1454 Programs100 Mm Only $3995 WARBIRD CHECKOUT VOL III Flying P-51 Mustang A-20 Bomber P-39 Introduction P-39 Advanced NF 1514 Programslb Mm Only $3995 CALL TOLL FREE IT CARDS LJ Day Night California outside USA Shipping Paid Continental USForeign add $500nts add 6 1/2% tax NF VIDEO LIBRARY 13470 WASHINGTON BLVD STE 207 MARINA DEL REY CA 90292 fuselage has much greater effect average modeler credits As fin rudder effect primarily flight direction fuse lage has exposed area fin rudder no matter what input give airplane swaybacked fuse lage will never fly straight enough suit model has crooked fuselage will fly straight speed trim will Because very tall narrow fuselage Sparrow actually functions like flight surface allowing plane perform knifeedge flight gracefully larger models its particularly important build straight mild bend fuselage sides facilitates very careful choos ing wood two sides dont have equal degree springiness fu selage almost fated come out crooked Start making up left right side wing saddle doublers spruce tank hatch strips pieces installed before sides joined intend install engine larger 19 engine have mind very hot before assembling fuse lage sides might fiberglass inside forward area say wing doubler up 6-oz glass cloth Hot Stuff isnt necessary stay engine-size limits dictated design have never yet seen model some didnt eventually subject over sized engine firewall made up two layers %-in ply Glue together installa tion later Drill hole wing dowel No 3 former have favorite method locating hole follow location specified plans exactly Slight incidence misalignments may scarcely noticed larger model will very detrimental model small Make cutouts No 4 former through pushrods extend rear model Adapt parameters cutouts shown plans suit radio necessary dont weaken area wing bolt block attaches Af ter have decided cutout patterns made sure formers configured radio glue No 3 4 formers fuselage sides Use triangle get formers square side other side glued top fu selage laid flat workbench Draw two sides together form tail very careful twists get built fuselage can traced operation Glue firewall using epoxy fast-setting glues have much improved last few years serve well purposes have better luck epoxy very high-vibration applications top block made very light A-in balsa sheet punky stuff took pains avoid building tail fine long its extremely light Dont hollow out unless unable oh32 Model AviationContinued page 34 Last An Automatic Full-Feathering Adjustable Pitch Propeller An exclusive patented 4 mechanism lets adjust pitch 8-4O optimum perfor mance blades automa tically feather when motor stops reduce drag give much Recommended 72-80 motor gliders similar models wing 4 loads up 14 ozI sq ft 05 direct e systems 1/ drive shaft Stock No MAO8XXE $2495 Suggested Retail Available Through Leading Distributors WINDSOR PROPELLER CO 384 Tesconi Ct Santa Rosa CA 95401 WARBIRD CHECKOUT VOL V Flying 8-29 Pre-Flightof BI7E Flight 8-24 NF 1553 Programsi 07 Mm Only $3995 WARBIRD CHECKOUT VOL IV Flying P-47 3 parts Flying T-6 3 parts NF 1366 Programslb MIn Only $3995 MODERN JET FIGHTER Flying F/A18 Hornet Eagle 6 F16C nnl Th4 ndohieds AC Custom Aviation Prints Original Pai Custom made photo prints ot several recent Model Builder COVER PAINTINGS Bob Benjamin now available INCLUDING Cl Prints future Model Builder COVER PAINTINGS will also available have something special mind Bob pleased discuss creating new originals custom commission basis ooorplete detale ne ordering prhits Inquire out alginat pairIngs oMI writ Robert Benjamin Aviation Art 1222 26th Ave NE Olympia WA 98506 206 352-2602 Curtiss Jenny * Quality hand-cut kit complete plans rigging scale control setup wire parts pre-bent special hardware included parts individually indentified packaged Decals Major Decal * Engine sizes 20 40 FS 25 TS * Wing unit removes four screws less 3 minutes flying wires left intact * Superb flight characteristics Introductory Price 812500 VISA erCard y Order Michigan residents add 4% sitien tax Add $550 P81 US orders $1250 foreign Video Catalog $1250 post incH VHS/Beta $5 rebate wilt roturn tapo kit ordor Reg catalog sample mini-plan *2 Hand-Cut Quality Affordable Price AERODROME MODELS LTD 2623 S Miller Rd ~__Saginaw Ml 48603 517781-3000 Othor Kits Avaiiabie Aero-Pacer Saby -Pacer Gipsy Moth Rybaby Fiybaby combo Hawkor Hurricane Jester tam wood thats sufficiently light because should have enough mass give stiffness fuselage Glue top block onto fuselage add triangle stock can see plans goes almost everywhere Make tail wheel strut /16 music wire Sew little ply former stall rear fuselage lack steerable tail wheel bothers theres no reason add using favorite method doesnt seem necessary model Add strip balsa uprights crosspieces rear fuselage well wing bolt block its triangle rein forcements Sheet bottom assem bly grain running crosswise Make hatch balsa block small plywood squares inserted inner face Attach wood screws small hardwood blocks added inside nose helps control vibration front model allowing hatch take some structural load nose prototype used two points tachment diagonal corners hatch using four plywood squares works much better easy access fuel tank isnt important youre planning stall engine larger recommended 19 size can skip foregoing just glue hatch place Personally like maintainability separate tank hatch Slot top block fin Doing after fuselage assembled ensures accu rate alignment completed fuselage shaped rounding top block hatch chose round off sharp corners behind wing prototype can wish adding triangle stock canopy Sparrow must very narrow fit properly can find ready-made fills bill means use Being unable find canopy narrow enough used Styrofoam custom make prototype After shaping foam suit give coat 2-oz glass cloth epoxy resin Paint prime canopy match model Since canopy factor determining size fin rudder would unwise 34 Model Aviation include model airplanes knife-edge capabilities might diminished model would behave needed dihedral Wing builder encounters biggest challenge Generally wing hardest part model build right other part model want wing warp-free yet its difficult part build warps want honest-flying Sparrow its wing must straight Ensure its straight warp-free before cover once webbing place wing will twist great extent wing area small old trick straightening wing MonoKote will work very poorly Dont rely Make spar carefully selected straight-grained spruce Using very straight-grained wood protects model coming apart air no matter much beating its given Test sam ple seeing can follow grain layer least 10 find piece straighter grain spar joined unusual manner Two strips spruce scraps left over making spars used double joint between spars center wing installed between top bottom caps just like splints 3A6-in ply plate shaped conform wing spar sweep epoxied place after wing joined wing dowel should glued place before wing sheeted ensure strong bond center ribs A-in balsa pieces side wing no stronger joint very certain its accu racy double-check wing straight before web spar webbing should installed very carefully under great deal strain modelers realize dont want have gaps would need filled glue webbing should run along straight vertical best effect Nothing else gives much strength small weight increase does proper web bing prototype I built up ailerons Continued page 36 ct OO J Power W Products Inc Only certified checks money orders accepted Minimum Order glom three packages 4 Pumerpoles $3 per package $t shipping huodhogi CT residents add 70% sales tao Prices nubiect ohange nofice DEALER INQUIRIES INVITED further information dealer paces send SASE Business Card SERMOS RIC SNAP CONNECTORS~ Celar Canes Si 8ox 16787 Stantad CI 069C203322-6294 pieces trailing edge sheeting cut out make aileron wells could over again would simply make solid balsa have indicated plans weight sav ings turned out almost nonexistent construction much timeconsuming making solid ailerons would have recommend using bellcranks because re careful about rig offer least amount play system wing can accommodate Id think twice about substituting something else airplane needs ailerons center time let go stick little stiffness acceptable Once sheeting place cover center joint 6-oz glass cloth ep oxy resin Hot Stuff cutout servo wing sheeting easier make before center section covered glass wing faired fuselage very light balsa block glued top glass wing block bolts should set fairing until bear wing self used 10-32 nylon bolts proto type because ability break away before wing block does However since nylon bolts difficult find some areas can substitute regular A-20 bolts necessary Assembly Bolt wing place true horizontal stabilizer eye much easier sounds Holding model up nose pointed towards change angle model until stab makes line just above top surface wing Adjust stab until paral lel wing measure top center firewall tips stab get proper alignment indicated plan view fin simply fitted slot top block its alignment will no bet ter slot Use triangle get fin square stab such small model misalignments will have magni fied effect exacting can dur ing assembly cowling built up same way canopy its bit difficult make fit perfectly engine its mount mount model tack glue foam blocks around engine up back spinner Mark foam front locate spinner circle Gently remove foam take engine mount off model preserve location spinner circle tack foam back onto model exactly broke off Glue front cowl former onto foam Carve sand foam shape prefer try fancier shape prototype keep lines simple will look odd Remove cowl form model cut off about / out side edge foam back cowl allow thickness fiberglass 36 Model Aviation SNAP POINT KNIFE SAMPLE Blade Included Send $125 Stamps 5/25s please Write Complete Price List Berkeley Trading Co PO Box 26- Dept HB Berkeley Springs WV 25411 258-2 773 THE FOX 50 HERE Light enough 40 size airplanes Powerful enough 60 size airplanes * * * * often have wished little power 40 size model couldnt see potting big heavy 60 up front 11A oz bare Fox 50 fills need energetic user friendly Fox 45 has stretched give extra torque necessary handle 11 prop authority retains its user friendly nature technically minded some pertinent data Bore Stroke Schneurle ported double ball bearing course The crankshaft machined piece SAE 86L20 steel surface hardened tempered crankpin ground before heat treat retain its hard skin The piston cast low expansion 390 alloy fitted free floating piston ring made patented process The 7/32 dia tubular wrist pin retained unique rollpin retaining system results considerable increase bearing area corresponding increase life cylinder hardened steel carefully tapered crossbotched bore sturdy connecting rod machined high strength aluminum bar fitted bronze bushing both ends The cylinder head uses two piece button design results accurate combustion chamber piece casting also has much stronger glow plug thread The crankcase pressure cast 384 alloy considerably stronger alloys manufacturers use Also design utilizes patented high back door feature resists compression stresses better conventional design BUY AND FLY ONE YOU WILL BE HAPPY WITH IT Fox motor test run factory checked idle full power throttla response compression Only motors meet performance standardr sold Most competitors reluctant spend time money check run motors risk spoiling exterior appearance thinli important motors run well finest motor world no good part broken cant get another Fox owners can get part promptly calling 501-646-1656 giving us motot size part name number Visa Mastercard number Duke Fox has building model airplane motors USA since 1943 Labor 100% American material except ball bearings Americar made MANUFACTURING 5305 TOWSON AVENUE FORT SMITH AR 72901 - - _________ PHONE 501 6461656 About three layers 2-oz glass cloth epoxy gives right combination light ness strength cowling will never crack vibration Unlike procedure making can opy foam must melted out cowling make room engine used dope thinner However thinner can cause severe discomfort fire hazard boot Use out doors extreme care An alternative method dig foam out knife cowling mounted small hard wood blocks glued firewall about % edge Use blocks desired long keep out way controls lines engine Very small countersunk wood screws used hold cowling place front former cowling can cut out clear throttle arm Dont cut away too much will rattle run engine Covering finishing MonoKote used prototypeorange fuse lage tail transparent red wings color scheme up sure make easy see small fast model flying away will quickly shrink dot ether want stand out vividly possible Covering model after assembly rather before little trou ble eliminates worry MonoKote between various pieces could interfere glue joints cowling can painted match MonoKote can prime fiberglass Ambroid cement MonoKote cowling fact though its obsolete general model building pur poses Ambroid will wonders making MonoKote stick epoxy firewalls wing center sections Radio engine Radio installation Sparrow tight managed fit old Tower Hobby System 4 radio mon ster servos full-size battery pack smaller radio will give better perform ance easier time installa tion Use battery position balance model can strongly recommend pushrods made wood Nyrod pushrods change length dif ferent temperatures small model can make unacceptable trim changes Dont use servo tape install flight control servos first time around installed Enya 15 plain bearing engine prototype provided enough power liftoff about 40 ft flight 50 mph range pulled vertical model quickly slowed down piloted smoothly airplane would vertical figure eight bigger engine clearly called improve vertical performance Replacing 15 Fox 25 plain bearing engine made difference hoped Upon command model would Continued page 133 s old timer perfeCtly pmportioned modeling Curtiss Robin 049 EngInes -Channel RIC 41 WIngspan ElectrIc Power Optional 82296 00 e03 Very tee lull scale aircraft ideally suited model olast s appealing aid curtiss Robin born spruce linen age beaatifally proportioned rubber electric glow engines Easy fan build trainerlike pertormanca Flyline Models Catalog 505 P5ono 17031 273-0503 FLYLINE MODELS INC PO Sos 2136 Palrtax VirgInia 22031 USA September 1988 37 ONLY 129Y5 INCLUDING SPINNER AND TILT DOWN MUFFLER ITEM NO 25000 Some things should consider comparing Fox 50 other brands ROCKET PLANE xP-1 Valley View Dr Box 43 716 372-8406Allegany NY 14706 Sparrow/Gardner Continued page 37 now dart straight up almost out sight happen have hot 15 20 will fine Please resist urge put 40 model Youd have rebalance airplane point would scarcely flyable unless engine three-quarters full throttle over burdened model would also very hard land Flying Careful trimming will help get out Sparrow Start about 3A5 aileron throw % ele vator throw 1 rudder throw Bal ance model point about % in front center-of-gravity plans Fly way several flights before change anything Quick isnt youll get used after few flights Once feel comfortable model can wring out bit begin get timing right move balance point back indi cated plans will make mod el little quicker yet will also release its snapping spinning potential Snapping maneuvers Sparrows strongest suit airplane will perform two full inside outside vertical snaps still heading straight up afterwards can partial snaps precision Granted intricate tricks like gliding three quarters outside snap knife-edge flight hard learn airplane happy doing Once have sharp ened timing youll find possi bilities almost limifless youre quick enough stirring sticks chances Sparrow will almost ma neuver days hauling flying larger model doesnt seem worth trouble model like Sparrow can really help keep edge Fly singular things alone can model isnt taken seriously least right off bat improvement flying skills definitely will Radio Technique/Myers Continued page 39 Hams required listen before transmit tends limit RE interference no guarantees Any quiet spot band can used Ham operator Charging ahead used Pacific Plan dis tribute Ham-band RC0O-09 channels shown Table 4 because 20-kHz raster because expect cur rent users can obtain Gold Sticker performance Hams should get together group insist moving everything Gold Sticker soon possible tainly 1991 AMA permits even-numbered chan nels sanctioned events Hams lib erty use 10 right now park makes Gold Sticker performance neces sary safe operation 53 MHz six-meter distribution Table 5 per Pacific Plan may neces sary due 100 kHz raster Replacing transmitter batteries times have noticed transmitter out put meter reads lower usual and/or operating time shorter used common problem cell bat tery pack has developed short circuit transmitter still under warranty probably send back manufacturer wait may out warranty and/or dont want wait Decision time find replace bad cell re place whole pack order make decision must re move pack transmitter Step disconnect pack mistakes can make working electronic circuit least forgivable damage components cause too lazy disconnect power supply momentary short circuit wrong place can destroy transmitters electronics So unplug battery pack can cut both wires cant simple matter put Deans connectors 19K54 $155 Ace RIC Inc Box 511E Higginsville MO 64037 cut ends wire want reassemble transmit ter Match wire colors install Deans connectors making sure male plug side transmitter pull pins out isolated contact provide means quick visual check connecting battery pack polarity reversed matter polarity Practically everyone uses Red k y Sribnick told particular case PCM trans mitters Futaha JR Red wire charger k wire meter necessary tool working batteriesand dont assume anything Now have pack hand put number cell using pen paper stick ers attach 20-ohm 10-watt resistor pack monitor voltage cell pack discharging Write down voltages cell five-minute intervals Keep discharg ing pack until cell reads 0 VDC Leave resistor connected wont hurt anything Looking list voltages will tell cells shorted start 0 VDC whether pack balanced cells get 0 VDC about same moment unbalanced dont pack unbalanced remove resistor charge pack overnight re peat test pack still unbalanced suggestion junk because another cell probably going fail Ace R/C sells kinds Ni-Cds probably can supply what needContinued page 134 SPECIALISTS IN CUSTOM COX TEE DEE & REED ENGINES 020S 049 051S & 09S ALL CUSTOM & STOCK PARTS AVAILABLE INDIVIDUALLY MANY NEW PARTS FOR OLD DISCONTINUED COX ENGINES COX PROPS & GLOW HEADS COMPETITION ACCESSORIES & CUSTOMIZED K&B ENGINES ALSO COMPLETE LINE OF RACING PARTS - GLO-BEE FIREBALL & K&B PLUGS SOLID LINES RACING WHEELS QUICK FILLS ETC WE ALSO STOCK CARBON FIBER KLOTZ OIL LATEX & SILICONE FUEL TUBING PEN BLADDER MATERIALS & HARDTO-FIND HARDWARE ESPECIALLY 2-56 & 3-48 SIZES COILS CONDENSERS NGK & STIlT PLUGS SILK 12 COLORS QUALITY DOPE BRUSHES 5 & 7 LOOP RUBBER BANDS KSB SEELIG & IGNITION TIMERS GAS & DIESEL FUEL TUBING TRANSISTOR IGNITION SYSTEMS RESISTOR HI-TENSION LEADS 1/2A TEXACO PLAYBOY SR KIT 1/2A TEXACO ENGINES & PARTS EVERYTHING YOU NEED FOR OLD TIMER EVENTS September 1988 133 TABLE 4 50 MHz Ham Band AircraftlSurfacelOommunications Uses ARRL band plan recognizes assignment RC StalionABCDE 20-kHz raster0003010402 0705080609 OUR REV-UP INVENTORY AVERAGES OVER 9000 PROPS I! CALL FOR IMMEDIATE SHIPMENT ON VISA OR MASTERCARD TABLE 5 6-Meter Ham Band Ai rcraft/Surface/CommuniCationS Uses 100-kHz raster Sta ABCDE 533531534532535 536537538 OLD TIMER SUPPLIES ORDER BY MAIL OR PHONE 619728-4365 SORRY NO COD VISA & MASTERCARD WELCOME DEALER INQUIRES INVITED MINIMUM MERCHANDISE ORDER $1000 SHIPPING & HANDLING FEE $150 FOR INSURANCE ADD $100 ORDERS SHIPPED WITHIN 24 HOURS S ADD 6% TAX
Edition: Model Aviation - 1988/09
Page Numbers: 26, 27, 28, 29, 30, 32, 34, 36, 37, 133
HAVE YOU BUILT small models lately answer follow ing questions yes read lighter scaled-down airplane may just what need right now have spend first hour flying field hands knees assem bling newest 60-powered wonderbird equipped tuned pipe Have ever passed over trip flying field because didnt want go trouble haul ing assembling feeding large model myself have passed up trips field no other reason down about quart glow fuel know quart fuel wont fly model long enough make trip worth right Franidy opinion large models can pain nuisance Propellers run $2 apiece break look wrong Having purchase MonoKote four rolls time Trips flying field awkward best downright uncom fortable worst disassembled cumbersome airplanes take up much room car someone must either hold engine lap hold tail keep blocking drivers line sight rearview mirror did ever notice much farther big models scatter break bigger harder fall certainly holds true flying field Larger models just have wider radius catastrophe Well ever build large models Simply because worth size weight allow fly graceflilly gently easily small models theres no remedy As rule larger models have light er wing loadings due scale effects retain good flight characteristics very high wing loadings cant argue bigger better Scale building Big engines seem easier adjust buy last longer Radios fit right want still leave plenty room other things such re tractable landing gear smoke system Big planes simply have air being serious respectable little ones Brawny appearance isnt everything though Oddly enough sophisti cated models know happen lightestthe Indoor microfilm models Al26 Model Aviation Top Although model quick large horizontal stabilizer prevents having nasty habits other little models bright colors help eyes stay locked onto small high-speed target Aside being fun main objective model hone piloting skills doing minimum Investment money aggravation Take things slowly first few flights sure keep plenty air under trying out new maneuvers S PARROW DESIGNED BY STEVE GARDNER FIBERGLASS COWL SPRUCE SffiRS IN3/3z BALSR RI5 /x FI TESTOCK ILSR STRIP rBRLSA3HEET N- BLSP SHEEJ 25 ENGINE N 7 ZDIA SPINNER 1DiA 1IL WHEEL CE &LSA HATCH 5QMAPLE LANDING GEAR BLOCK4ll j DIR MUSIC WIRE LE- Left Remove prop five sheet metal screws have easy access tne engine tuel tank battery pack engine problems really problems fuel system important have easy access fuel tank Right height firewall makes cowl 15-size engine appear short height front allows larger engines longer cowlings used looking odd Left Our author says has always preferred belicranks actuate ailerons because have least amount play system available also allow aileron servo mounted flat wing save space Right hold thin wire landing gear groove nylon straps slanted puts screw head closer wire applies pressure directly wire though dont say words devotees big models often think smaller-scale airplanes little better toys So big models imposing flying field have other virtues smaller craft offer different compensations lighter birds often very distinctive flying challenges modeler ways big ones dont Small models antidote complacency can stand taken seriously youre game piloting ship will fly smoothly unless fly smoothly reaction time up smaller airplanes unruly manners might just ready think small might just ready sacrifice prestige ease big prepossessing models ex citement knowing youve learned handie airplane competently well youre weary lugging around support gear big model little guy definitely ticket need starting battery pint fuel trans mitter youre ready go Because smaller plane will fit cars having disassembled no tools needed pint fuel will keep air four 10-minute flights smaller model will bounce larger would shatter Above said before lighter bird will keep toes Small models have characteris tic twitchiness dont want fly smooth ly nervous giddy machines al ways quick translate control input abrupt change flight path what amounts much greater con trol authority pilotextra maneuver ability motivated flier can use good advantage practice can learn orchestrate intricate maneuvers can gotten larger airplane fact can learn fly Sparrow smoothly youll able handle anything larger precision never knew Little airplanes train reflexes better fastest video games low inertia models makes possible cer tain maneuvers forbidden larger ones Sparrow will snapping maneu vers like no other airplane have ever flown can start stop snaps literally instan taneously once have required tim ing Eight-sided loops easy too corners sharp Finally smaller models easier build up certain strength Like early Grumman fighters Sparrow de signed nearly indestructible flight Although its slightest overbuilt airplane allows enter abrupt ma neuvers much higher speeds might larger model Its light weight low inertia permit rapid-fire succes sion maneuvers despite its low drag comes time slow down Spar row will lose speed rapidly rather like having built-in glide path control Larger aircraft still rule flying field smaller birds complement nicely could certainly worse build Sparrow stable models learn put want skills control authority youll de velop maneuvering airplane guar anteed carry over flying Construction standard practice build tail surfaces first sort warm-up Tail surfaces easy build too demanding theyre fairly painless way get modeling mood tail surfaces shouldnt carefully constructed rest 28 Model Aviation /4 DIA DOWEL IL SOFT BALSA BLOCK HOLLOWED WING TIPWING PLAN TOP VIEW1/L4 SPRUCE DOUOER CENTER ALL WING SHEETING1/2 ESECT IS 1/16 BALSALG BLOCKS-if -2AV~fl [v32][b-1-10-1-10]] ALL BiC BRACE III/BPLY 1/BPLYDIIEDRAL B MOUNTBRACE ___IW9W __K7 — __- W3W-2 __-U 1 0 WING DIHEDRALAILERON- 3/4 AT EACH TIPHORN1/4 BALSA SHEPTCENTER SECT COVERED I/B BALSADOWEL RETAINERWITH 2 OZ FIBERGLASS -0 Ki7[11ISUB-SPAR HINGEIz3/8 BALSA 3/16 HARD BALSALOCATIONT E STOCK FILL I/B PLY C L FORMER C 1/4 BALSA1/4 TRI SHEETSTOCK P2 Fl F-I S F2 1/16 PLY ____ACE 1/B PLY PLATE IN HATCH FOR HATCHMOUNTING SCREW 1/4 TRI W NG BO T 1F3MOUNT 1/4 TRI-STOCK CZ-. F-IR COWL IS 2 LAYERS OF 6 OZ FIBER GLASS / _____ TYPICAL HARDWOOD/1/8 HD BALSA FUSELAGE BOTTOM COWL MOUNTLBxI/4TYP HARD- WING SADDLEVIEW WOOD HATCH MOUNT BLOCKGLASS COVERED FOAM OR CLEAR COMMERCIAL CANOPY I/B MED BALSA P3FUSELAGE SIDES1/4 TRI-STOCK HO WOOD 7/BLOCK IF-4 2 DA SP NNER ______________________ I/B HO BALSA .5rzz* G SADDLE i ALL RIBS ARE ----..3/32 BALSA SHEET MEDIUM 1/B MED BALSA FUSE SIDES P4 1/4BALSA- SHEET~i STABILIZER ___-—ELEVATORHINGE TO SUIT I/4DOWEL/4 BALSA SHEET 1/8 BALSA1/B PLY GUSSETMOUNT ii7~ ~2I 1/4 BALSA SHEET ___________________IL LIGHT 1/B BALSA SI-EET BOTTOM OMITTED FOR CLARITY7I 1/4 TRI-1/x STOCK/4 BALSA SA STRIP ______/OUTLINES TRI- STOCK 7I' FINRUD \\ 1/4 BALSA SHEET TOP/ I/4BALSA VERY LIGHT 4 4 NYLONSTRIP FORMER1/B BALSA SHEET LSHARDWOODBOLTI/B BALSACROSS GRAIN PLBLOCKSUGHTSHEET BALSA1/8 DIA OS FSR 25V4UIBBLOCKMUSIC WIREFUSELAGE SIDE VIEW ENGINESPRUCELIGHT BALSA BLOCK HATCH 2 DIA WHEELSFull-Size Plans Available See Page 178 /4 BALSA SHEET 1/4 TRI 4K 1/B MED I/B PLY I/B PLY 0I2 345 6 MODEL AVIATION SPARROW DESIGNED BY STEVE GARDNER TRACING BY OE DEMARCO ALL RIGHTS RESERVED Left A dog-leg wire elevator push rod model small mistake would big 60-powered job careful make cross leg short possible sure longer sections parallel Right Control surfaces may seem too small first glance adequate conceivable maneuver keep hinge gaps small possible maximum efficiency model its just arent very hard build correctly critical step constructing airplanes tail proper choice wood gram build tail will add about five grams weight fin ished model Overbuilding will force compensate extra nose weight Worse still may try fly adding extra weight Add extra nose weight performance suffers Sidestep problem model wont fly Obviously building tail too heavy puts quandary best avoided ideal wood Sparrow tail surfacesbalsa 6- 8-lb-per-cu-ft classeliminates need add nose weight However form need balsa usually hard find Whats wanted stiff firm grade bal sa punky material feels like Styrofoam type balsa also wood choice building Hand-Launched Glider wings Free Flighters hoard like treasure mentioning possibility getting some stuff Free Flighter would probably fool hardy Dont try substitute 3A6-in balsa A-in thickness specified plans extra thickness needed lend adequate stiffness horizontal stabilizer ra tionale based having seen just about stab failures wing failures stabilizers get pounding flight theyre also subject getting hung door jambs trunk lids because promi nence Stabs built A-in balsa can stand abuse wont come apart until break off against ground As shown plans Ive made up edges fin rudder using strips grain running parallel edge purpose simply make edges easier round well help hold tail straight Since pieces A-in balsa small tend warp toO badly strips optional save having round end grain surfaces cant well enough suit stan dards use strips elevators joined either strip hardwood dowel square fiber glass cloth may folded over dowel leading edge elevator rein force joint will also strengthen area elevator horn mounted Trim cloth away slot 30 Model Aviation fuselage resist urge make slot elevator smaller Although clearance may seem excessive now can quickly become inadequate tail gets wet fuselage swells just tad situation elevator will jamand happens flight over maybe good Sand leading edges rudder elevator housetop-shaped point set hinges wood until hinge pin centerlines point housetop will allow leave very small gap hinge line MonoKote hinges may used preferred because particular geometry might necessary enlarge hole fuse lage order clear greater motion elevator joiner Fuselage Underestimating structural importance fuselage seems fairly common error among modelers Ap parently such builders assume func tion fuselage merely hold wing tail proper juxtaposition oversimplification Any part model exposed airflow has impact performance reality Continued page 32 Left If use older large radio like installation will tight impossible Using smaller servos ana u mn Dattery pack makes things easier saves weight Right Mounting aileron servo flat wing gives room between other servos ORDERS SHIPPED DAY RECEIVED WARBIRD VIDEOS VHS OR BETA OUR 23RD YEAR SPE6IA[ IWTRODO6IORY OFFER WARBIRD CHECKOUT VOL 1 Flying P-40 Warhawk Corsair Hellcat SB2-A Buccanneer Avenger NF 1325 Programs2 Hr Only $3995 ANY TWO VIDEOS ONLY $7595 ANY 3 VIDEOS ONLY $10795 AILS VIDEOS ONLY $19995 WARBIRD CHECKOUT VOL 11 Flying P-38 Mitchell Bomber P61 Black Widow Invader NF 1454 Programs100 Mm Only $3995 WARBIRD CHECKOUT VOL III Flying P-51 Mustang A-20 Bomber P-39 Introduction P-39 Advanced NF 1514 Programslb Mm Only $3995 CALL TOLL FREE IT CARDS LJ Day Night California outside USA Shipping Paid Continental USForeign add $500nts add 6 1/2% tax NF VIDEO LIBRARY 13470 WASHINGTON BLVD STE 207 MARINA DEL REY CA 90292 fuselage has much greater effect average modeler credits As fin rudder effect primarily flight direction fuse lage has exposed area fin rudder no matter what input give airplane swaybacked fuse lage will never fly straight enough suit model has crooked fuselage will fly straight speed trim will Because very tall narrow fuselage Sparrow actually functions like flight surface allowing plane perform knifeedge flight gracefully larger models its particularly important build straight mild bend fuselage sides facilitates very careful choos ing wood two sides dont have equal degree springiness fu selage almost fated come out crooked Start making up left right side wing saddle doublers spruce tank hatch strips pieces installed before sides joined intend install engine larger 19 engine have mind very hot before assembling fuse lage sides might fiberglass inside forward area say wing doubler up 6-oz glass cloth Hot Stuff isnt necessary stay engine-size limits dictated design have never yet seen model some didnt eventually subject over sized engine firewall made up two layers %-in ply Glue together installa tion later Drill hole wing dowel No 3 former have favorite method locating hole follow location specified plans exactly Slight incidence misalignments may scarcely noticed larger model will very detrimental model small Make cutouts No 4 former through pushrods extend rear model Adapt parameters cutouts shown plans suit radio necessary dont weaken area wing bolt block attaches Af ter have decided cutout patterns made sure formers configured radio glue No 3 4 formers fuselage sides Use triangle get formers square side other side glued top fu selage laid flat workbench Draw two sides together form tail very careful twists get built fuselage can traced operation Glue firewall using epoxy fast-setting glues have much improved last few years serve well purposes have better luck epoxy very high-vibration applications top block made very light A-in balsa sheet punky stuff took pains avoid building tail fine long its extremely light Dont hollow out unless unable oh32 Model AviationContinued page 34 Last An Automatic Full-Feathering Adjustable Pitch Propeller An exclusive patented 4 mechanism lets adjust pitch 8-4O optimum perfor mance blades automa tically feather when motor stops reduce drag give much Recommended 72-80 motor gliders similar models wing 4 loads up 14 ozI sq ft 05 direct e systems 1/ drive shaft Stock No MAO8XXE $2495 Suggested Retail Available Through Leading Distributors WINDSOR PROPELLER CO 384 Tesconi Ct Santa Rosa CA 95401 WARBIRD CHECKOUT VOL V Flying 8-29 Pre-Flightof BI7E Flight 8-24 NF 1553 Programsi 07 Mm Only $3995 WARBIRD CHECKOUT VOL IV Flying P-47 3 parts Flying T-6 3 parts NF 1366 Programslb MIn Only $3995 MODERN JET FIGHTER Flying F/A18 Hornet Eagle 6 F16C nnl Th4 ndohieds AC Custom Aviation Prints Original Pai Custom made photo prints ot several recent Model Builder COVER PAINTINGS Bob Benjamin now available INCLUDING Cl Prints future Model Builder COVER PAINTINGS will also available have something special mind Bob pleased discuss creating new originals custom commission basis ooorplete detale ne ordering prhits Inquire out alginat pairIngs oMI writ Robert Benjamin Aviation Art 1222 26th Ave NE Olympia WA 98506 206 352-2602 Curtiss Jenny * Quality hand-cut kit complete plans rigging scale control setup wire parts pre-bent special hardware included parts individually indentified packaged Decals Major Decal * Engine sizes 20 40 FS 25 TS * Wing unit removes four screws less 3 minutes flying wires left intact * Superb flight characteristics Introductory Price 812500 VISA erCard y Order Michigan residents add 4% sitien tax Add $550 P81 US orders $1250 foreign Video Catalog $1250 post incH VHS/Beta $5 rebate wilt roturn tapo kit ordor Reg catalog sample mini-plan *2 Hand-Cut Quality Affordable Price AERODROME MODELS LTD 2623 S Miller Rd ~__Saginaw Ml 48603 517781-3000 Othor Kits Avaiiabie Aero-Pacer Saby -Pacer Gipsy Moth Rybaby Fiybaby combo Hawkor Hurricane Jester tam wood thats sufficiently light because should have enough mass give stiffness fuselage Glue top block onto fuselage add triangle stock can see plans goes almost everywhere Make tail wheel strut /16 music wire Sew little ply former stall rear fuselage lack steerable tail wheel bothers theres no reason add using favorite method doesnt seem necessary model Add strip balsa uprights crosspieces rear fuselage well wing bolt block its triangle rein forcements Sheet bottom assem bly grain running crosswise Make hatch balsa block small plywood squares inserted inner face Attach wood screws small hardwood blocks added inside nose helps control vibration front model allowing hatch take some structural load nose prototype used two points tachment diagonal corners hatch using four plywood squares works much better easy access fuel tank isnt important youre planning stall engine larger recommended 19 size can skip foregoing just glue hatch place Personally like maintainability separate tank hatch Slot top block fin Doing after fuselage assembled ensures accu rate alignment completed fuselage shaped rounding top block hatch chose round off sharp corners behind wing prototype can wish adding triangle stock canopy Sparrow must very narrow fit properly can find ready-made fills bill means use Being unable find canopy narrow enough used Styrofoam custom make prototype After shaping foam suit give coat 2-oz glass cloth epoxy resin Paint prime canopy match model Since canopy factor determining size fin rudder would unwise 34 Model Aviation include model airplanes knife-edge capabilities might diminished model would behave needed dihedral Wing builder encounters biggest challenge Generally wing hardest part model build right other part model want wing warp-free yet its difficult part build warps want honest-flying Sparrow its wing must straight Ensure its straight warp-free before cover once webbing place wing will twist great extent wing area small old trick straightening wing MonoKote will work very poorly Dont rely Make spar carefully selected straight-grained spruce Using very straight-grained wood protects model coming apart air no matter much beating its given Test sam ple seeing can follow grain layer least 10 find piece straighter grain spar joined unusual manner Two strips spruce scraps left over making spars used double joint between spars center wing installed between top bottom caps just like splints 3A6-in ply plate shaped conform wing spar sweep epoxied place after wing joined wing dowel should glued place before wing sheeted ensure strong bond center ribs A-in balsa pieces side wing no stronger joint very certain its accu racy double-check wing straight before web spar webbing should installed very carefully under great deal strain modelers realize dont want have gaps would need filled glue webbing should run along straight vertical best effect Nothing else gives much strength small weight increase does proper web bing prototype I built up ailerons Continued page 36 ct OO J Power W Products Inc Only certified checks money orders accepted Minimum Order glom three packages 4 Pumerpoles $3 per package $t shipping huodhogi CT residents add 70% sales tao Prices nubiect ohange nofice DEALER INQUIRIES INVITED further information dealer paces send SASE Business Card SERMOS RIC SNAP CONNECTORS~ Celar Canes Si 8ox 16787 Stantad CI 069C203322-6294 pieces trailing edge sheeting cut out make aileron wells could over again would simply make solid balsa have indicated plans weight sav ings turned out almost nonexistent construction much timeconsuming making solid ailerons would have recommend using bellcranks because re careful about rig offer least amount play system wing can accommodate Id think twice about substituting something else airplane needs ailerons center time let go stick little stiffness acceptable Once sheeting place cover center joint 6-oz glass cloth ep oxy resin Hot Stuff cutout servo wing sheeting easier make before center section covered glass wing faired fuselage very light balsa block glued top glass wing block bolts should set fairing until bear wing self used 10-32 nylon bolts proto type because ability break away before wing block does However since nylon bolts difficult find some areas can substitute regular A-20 bolts necessary Assembly Bolt wing place true horizontal stabilizer eye much easier sounds Holding model up nose pointed towards change angle model until stab makes line just above top surface wing Adjust stab until paral lel wing measure top center firewall tips stab get proper alignment indicated plan view fin simply fitted slot top block its alignment will no bet ter slot Use triangle get fin square stab such small model misalignments will have magni fied effect exacting can dur ing assembly cowling built up same way canopy its bit difficult make fit perfectly engine its mount mount model tack glue foam blocks around engine up back spinner Mark foam front locate spinner circle Gently remove foam take engine mount off model preserve location spinner circle tack foam back onto model exactly broke off Glue front cowl former onto foam Carve sand foam shape prefer try fancier shape prototype keep lines simple will look odd Remove cowl form model cut off about / out side edge foam back cowl allow thickness fiberglass 36 Model Aviation SNAP POINT KNIFE SAMPLE Blade Included Send $125 Stamps 5/25s please Write Complete Price List Berkeley Trading Co PO Box 26- Dept HB Berkeley Springs WV 25411 258-2 773 THE FOX 50 HERE Light enough 40 size airplanes Powerful enough 60 size airplanes * * * * often have wished little power 40 size model couldnt see potting big heavy 60 up front 11A oz bare Fox 50 fills need energetic user friendly Fox 45 has stretched give extra torque necessary handle 11 prop authority retains its user friendly nature technically minded some pertinent data Bore Stroke Schneurle ported double ball bearing course The crankshaft machined piece SAE 86L20 steel surface hardened tempered crankpin ground before heat treat retain its hard skin The piston cast low expansion 390 alloy fitted free floating piston ring made patented process The 7/32 dia tubular wrist pin retained unique rollpin retaining system results considerable increase bearing area corresponding increase life cylinder hardened steel carefully tapered crossbotched bore sturdy connecting rod machined high strength aluminum bar fitted bronze bushing both ends The cylinder head uses two piece button design results accurate combustion chamber piece casting also has much stronger glow plug thread The crankcase pressure cast 384 alloy considerably stronger alloys manufacturers use Also design utilizes patented high back door feature resists compression stresses better conventional design BUY AND FLY ONE YOU WILL BE HAPPY WITH IT Fox motor test run factory checked idle full power throttla response compression Only motors meet performance standardr sold Most competitors reluctant spend time money check run motors risk spoiling exterior appearance thinli important motors run well finest motor world no good part broken cant get another Fox owners can get part promptly calling 501-646-1656 giving us motot size part name number Visa Mastercard number Duke Fox has building model airplane motors USA since 1943 Labor 100% American material except ball bearings Americar made MANUFACTURING 5305 TOWSON AVENUE FORT SMITH AR 72901 - - _________ PHONE 501 6461656 About three layers 2-oz glass cloth epoxy gives right combination light ness strength cowling will never crack vibration Unlike procedure making can opy foam must melted out cowling make room engine used dope thinner However thinner can cause severe discomfort fire hazard boot Use out doors extreme care An alternative method dig foam out knife cowling mounted small hard wood blocks glued firewall about % edge Use blocks desired long keep out way controls lines engine Very small countersunk wood screws used hold cowling place front former cowling can cut out clear throttle arm Dont cut away too much will rattle run engine Covering finishing MonoKote used prototypeorange fuse lage tail transparent red wings color scheme up sure make easy see small fast model flying away will quickly shrink dot ether want stand out vividly possible Covering model after assembly rather before little trou ble eliminates worry MonoKote between various pieces could interfere glue joints cowling can painted match MonoKote can prime fiberglass Ambroid cement MonoKote cowling fact though its obsolete general model building pur poses Ambroid will wonders making MonoKote stick epoxy firewalls wing center sections Radio engine Radio installation Sparrow tight managed fit old Tower Hobby System 4 radio mon ster servos full-size battery pack smaller radio will give better perform ance easier time installa tion Use battery position balance model can strongly recommend pushrods made wood Nyrod pushrods change length dif ferent temperatures small model can make unacceptable trim changes Dont use servo tape install flight control servos first time around installed Enya 15 plain bearing engine prototype provided enough power liftoff about 40 ft flight 50 mph range pulled vertical model quickly slowed down piloted smoothly airplane would vertical figure eight bigger engine clearly called improve vertical performance Replacing 15 Fox 25 plain bearing engine made difference hoped Upon command model would Continued page 133 s old timer perfeCtly pmportioned modeling Curtiss Robin 049 EngInes -Channel RIC 41 WIngspan ElectrIc Power Optional 82296 00 e03 Very tee lull scale aircraft ideally suited model olast s appealing aid curtiss Robin born spruce linen age beaatifally proportioned rubber electric glow engines Easy fan build trainerlike pertormanca Flyline Models Catalog 505 P5ono 17031 273-0503 FLYLINE MODELS INC PO Sos 2136 Palrtax VirgInia 22031 USA September 1988 37 ONLY 129Y5 INCLUDING SPINNER AND TILT DOWN MUFFLER ITEM NO 25000 Some things should consider comparing Fox 50 other brands ROCKET PLANE xP-1 Valley View Dr Box 43 716 372-8406Allegany NY 14706 Sparrow/Gardner Continued page 37 now dart straight up almost out sight happen have hot 15 20 will fine Please resist urge put 40 model Youd have rebalance airplane point would scarcely flyable unless engine three-quarters full throttle over burdened model would also very hard land Flying Careful trimming will help get out Sparrow Start about 3A5 aileron throw % ele vator throw 1 rudder throw Bal ance model point about % in front center-of-gravity plans Fly way several flights before change anything Quick isnt youll get used after few flights Once feel comfortable model can wring out bit begin get timing right move balance point back indi cated plans will make mod el little quicker yet will also release its snapping spinning potential Snapping maneuvers Sparrows strongest suit airplane will perform two full inside outside vertical snaps still heading straight up afterwards can partial snaps precision Granted intricate tricks like gliding three quarters outside snap knife-edge flight hard learn airplane happy doing Once have sharp ened timing youll find possi bilities almost limifless youre quick enough stirring sticks chances Sparrow will almost ma neuver days hauling flying larger model doesnt seem worth trouble model like Sparrow can really help keep edge Fly singular things alone can model isnt taken seriously least right off bat improvement flying skills definitely will Radio Technique/Myers Continued page 39 Hams required listen before transmit tends limit RE interference no guarantees Any quiet spot band can used Ham operator Charging ahead used Pacific Plan dis tribute Ham-band RC0O-09 channels shown Table 4 because 20-kHz raster because expect cur rent users can obtain Gold Sticker performance Hams should get together group insist moving everything Gold Sticker soon possible tainly 1991 AMA permits even-numbered chan nels sanctioned events Hams lib erty use 10 right now park makes Gold Sticker performance neces sary safe operation 53 MHz six-meter distribution Table 5 per Pacific Plan may neces sary due 100 kHz raster Replacing transmitter batteries times have noticed transmitter out put meter reads lower usual and/or operating time shorter used common problem cell bat tery pack has developed short circuit transmitter still under warranty probably send back manufacturer wait may out warranty and/or dont want wait Decision time find replace bad cell re place whole pack order make decision must re move pack transmitter Step disconnect pack mistakes can make working electronic circuit least forgivable damage components cause too lazy disconnect power supply momentary short circuit wrong place can destroy transmitters electronics So unplug battery pack can cut both wires cant simple matter put Deans connectors 19K54 $155 Ace RIC Inc Box 511E Higginsville MO 64037 cut ends wire want reassemble transmit ter Match wire colors install Deans connectors making sure male plug side transmitter pull pins out isolated contact provide means quick visual check connecting battery pack polarity reversed matter polarity Practically everyone uses Red k y Sribnick told particular case PCM trans mitters Futaha JR Red wire charger k wire meter necessary tool working batteriesand dont assume anything Now have pack hand put number cell using pen paper stick ers attach 20-ohm 10-watt resistor pack monitor voltage cell pack discharging Write down voltages cell five-minute intervals Keep discharg ing pack until cell reads 0 VDC Leave resistor connected wont hurt anything Looking list voltages will tell cells shorted start 0 VDC whether pack balanced cells get 0 VDC about same moment unbalanced dont pack unbalanced remove resistor charge pack overnight re peat test pack still unbalanced suggestion junk because another cell probably going fail Ace R/C sells kinds Ni-Cds probably can supply what needContinued page 134 SPECIALISTS IN CUSTOM COX TEE DEE & REED ENGINES 020S 049 051S & 09S ALL CUSTOM & STOCK PARTS AVAILABLE INDIVIDUALLY MANY NEW PARTS FOR OLD DISCONTINUED COX ENGINES COX PROPS & GLOW HEADS COMPETITION ACCESSORIES & CUSTOMIZED K&B ENGINES ALSO COMPLETE LINE OF RACING PARTS - GLO-BEE FIREBALL & K&B PLUGS SOLID LINES RACING WHEELS QUICK FILLS ETC WE ALSO STOCK CARBON FIBER KLOTZ OIL LATEX & SILICONE FUEL TUBING PEN BLADDER MATERIALS & HARDTO-FIND HARDWARE ESPECIALLY 2-56 & 3-48 SIZES COILS CONDENSERS NGK & STIlT PLUGS SILK 12 COLORS QUALITY DOPE BRUSHES 5 & 7 LOOP RUBBER BANDS KSB SEELIG & IGNITION TIMERS GAS & DIESEL FUEL TUBING TRANSISTOR IGNITION SYSTEMS RESISTOR HI-TENSION LEADS 1/2A TEXACO PLAYBOY SR KIT 1/2A TEXACO ENGINES & PARTS EVERYTHING YOU NEED FOR OLD TIMER EVENTS September 1988 133 TABLE 4 50 MHz Ham Band AircraftlSurfacelOommunications Uses ARRL band plan recognizes assignment RC StalionABCDE 20-kHz raster0003010402 0705080609 OUR REV-UP INVENTORY AVERAGES OVER 9000 PROPS I! CALL FOR IMMEDIATE SHIPMENT ON VISA OR MASTERCARD TABLE 5 6-Meter Ham Band Ai rcraft/Surface/CommuniCationS Uses 100-kHz raster Sta ABCDE 533531534532535 536537538 OLD TIMER SUPPLIES ORDER BY MAIL OR PHONE 619728-4365 SORRY NO COD VISA & MASTERCARD WELCOME DEALER INQUIRES INVITED MINIMUM MERCHANDISE ORDER $1000 SHIPPING & HANDLING FEE $150 FOR INSURANCE ADD $100 ORDERS SHIPPED WITHIN 24 HOURS S ADD 6% TAX
Edition: Model Aviation - 1988/09
Page Numbers: 26, 27, 28, 29, 30, 32, 34, 36, 37, 133
HAVE YOU BUILT small models lately answer follow ing questions yes read lighter scaled-down airplane may just what need right now have spend first hour flying field hands knees assem bling newest 60-powered wonderbird equipped tuned pipe Have ever passed over trip flying field because didnt want go trouble haul ing assembling feeding large model myself have passed up trips field no other reason down about quart glow fuel know quart fuel wont fly model long enough make trip worth right Franidy opinion large models can pain nuisance Propellers run $2 apiece break look wrong Having purchase MonoKote four rolls time Trips flying field awkward best downright uncom fortable worst disassembled cumbersome airplanes take up much room car someone must either hold engine lap hold tail keep blocking drivers line sight rearview mirror did ever notice much farther big models scatter break bigger harder fall certainly holds true flying field Larger models just have wider radius catastrophe Well ever build large models Simply because worth size weight allow fly graceflilly gently easily small models theres no remedy As rule larger models have light er wing loadings due scale effects retain good flight characteristics very high wing loadings cant argue bigger better Scale building Big engines seem easier adjust buy last longer Radios fit right want still leave plenty room other things such re tractable landing gear smoke system Big planes simply have air being serious respectable little ones Brawny appearance isnt everything though Oddly enough sophisti cated models know happen lightestthe Indoor microfilm models Al26 Model Aviation Top Although model quick large horizontal stabilizer prevents having nasty habits other little models bright colors help eyes stay locked onto small high-speed target Aside being fun main objective model hone piloting skills doing minimum Investment money aggravation Take things slowly first few flights sure keep plenty air under trying out new maneuvers S PARROW DESIGNED BY STEVE GARDNER FIBERGLASS COWL SPRUCE SffiRS IN3/3z BALSR RI5 /x FI TESTOCK ILSR STRIP rBRLSA3HEET N- BLSP SHEEJ 25 ENGINE N 7 ZDIA SPINNER 1DiA 1IL WHEEL CE &LSA HATCH 5QMAPLE LANDING GEAR BLOCK4ll j DIR MUSIC WIRE LE- Left Remove prop five sheet metal screws have easy access tne engine tuel tank battery pack engine problems really problems fuel system important have easy access fuel tank Right height firewall makes cowl 15-size engine appear short height front allows larger engines longer cowlings used looking odd Left Our author says has always preferred belicranks actuate ailerons because have least amount play system available also allow aileron servo mounted flat wing save space Right hold thin wire landing gear groove nylon straps slanted puts screw head closer wire applies pressure directly wire though dont say words devotees big models often think smaller-scale airplanes little better toys So big models imposing flying field have other virtues smaller craft offer different compensations lighter birds often very distinctive flying challenges modeler ways big ones dont Small models antidote complacency can stand taken seriously youre game piloting ship will fly smoothly unless fly smoothly reaction time up smaller airplanes unruly manners might just ready think small might just ready sacrifice prestige ease big prepossessing models ex citement knowing youve learned handie airplane competently well youre weary lugging around support gear big model little guy definitely ticket need starting battery pint fuel trans mitter youre ready go Because smaller plane will fit cars having disassembled no tools needed pint fuel will keep air four 10-minute flights smaller model will bounce larger would shatter Above said before lighter bird will keep toes Small models have characteris tic twitchiness dont want fly smooth ly nervous giddy machines al ways quick translate control input abrupt change flight path what amounts much greater con trol authority pilotextra maneuver ability motivated flier can use good advantage practice can learn orchestrate intricate maneuvers can gotten larger airplane fact can learn fly Sparrow smoothly youll able handle anything larger precision never knew Little airplanes train reflexes better fastest video games low inertia models makes possible cer tain maneuvers forbidden larger ones Sparrow will snapping maneu vers like no other airplane have ever flown can start stop snaps literally instan taneously once have required tim ing Eight-sided loops easy too corners sharp Finally smaller models easier build up certain strength Like early Grumman fighters Sparrow de signed nearly indestructible flight Although its slightest overbuilt airplane allows enter abrupt ma neuvers much higher speeds might larger model Its light weight low inertia permit rapid-fire succes sion maneuvers despite its low drag comes time slow down Spar row will lose speed rapidly rather like having built-in glide path control Larger aircraft still rule flying field smaller birds complement nicely could certainly worse build Sparrow stable models learn put want skills control authority youll de velop maneuvering airplane guar anteed carry over flying Construction standard practice build tail surfaces first sort warm-up Tail surfaces easy build too demanding theyre fairly painless way get modeling mood tail surfaces shouldnt carefully constructed rest 28 Model Aviation /4 DIA DOWEL IL SOFT BALSA BLOCK HOLLOWED WING TIPWING PLAN TOP VIEW1/L4 SPRUCE DOUOER CENTER ALL WING SHEETING1/2 ESECT IS 1/16 BALSALG BLOCKS-if -2AV~fl [v32][b-1-10-1-10]] ALL BiC BRACE III/BPLY 1/BPLYDIIEDRAL B MOUNTBRACE ___IW9W __K7 — __- W3W-2 __-U 1 0 WING DIHEDRALAILERON- 3/4 AT EACH TIPHORN1/4 BALSA SHEPTCENTER SECT COVERED I/B BALSADOWEL RETAINERWITH 2 OZ FIBERGLASS -0 Ki7[11ISUB-SPAR HINGEIz3/8 BALSA 3/16 HARD BALSALOCATIONT E STOCK FILL I/B PLY C L FORMER C 1/4 BALSA1/4 TRI SHEETSTOCK P2 Fl F-I S F2 1/16 PLY ____ACE 1/B PLY PLATE IN HATCH FOR HATCHMOUNTING SCREW 1/4 TRI W NG BO T 1F3MOUNT 1/4 TRI-STOCK CZ-. F-IR COWL IS 2 LAYERS OF 6 OZ FIBER GLASS / _____ TYPICAL HARDWOOD/1/8 HD BALSA FUSELAGE BOTTOM COWL MOUNTLBxI/4TYP HARD- WING SADDLEVIEW WOOD HATCH MOUNT BLOCKGLASS COVERED FOAM OR CLEAR COMMERCIAL CANOPY I/B MED BALSA P3FUSELAGE SIDES1/4 TRI-STOCK HO WOOD 7/BLOCK IF-4 2 DA SP NNER ______________________ I/B HO BALSA .5rzz* G SADDLE i ALL RIBS ARE ----..3/32 BALSA SHEET MEDIUM 1/B MED BALSA FUSE SIDES P4 1/4BALSA- SHEET~i STABILIZER ___-—ELEVATORHINGE TO SUIT I/4DOWEL/4 BALSA SHEET 1/8 BALSA1/B PLY GUSSETMOUNT ii7~ ~2I 1/4 BALSA SHEET ___________________IL LIGHT 1/B BALSA SI-EET BOTTOM OMITTED FOR CLARITY7I 1/4 TRI-1/x STOCK/4 BALSA SA STRIP ______/OUTLINES TRI- STOCK 7I' FINRUD \\ 1/4 BALSA SHEET TOP/ I/4BALSA VERY LIGHT 4 4 NYLONSTRIP FORMER1/B BALSA SHEET LSHARDWOODBOLTI/B BALSACROSS GRAIN PLBLOCKSUGHTSHEET BALSA1/8 DIA OS FSR 25V4UIBBLOCKMUSIC WIREFUSELAGE SIDE VIEW ENGINESPRUCELIGHT BALSA BLOCK HATCH 2 DIA WHEELSFull-Size Plans Available See Page 178 /4 BALSA SHEET 1/4 TRI 4K 1/B MED I/B PLY I/B PLY 0I2 345 6 MODEL AVIATION SPARROW DESIGNED BY STEVE GARDNER TRACING BY OE DEMARCO ALL RIGHTS RESERVED Left A dog-leg wire elevator push rod model small mistake would big 60-powered job careful make cross leg short possible sure longer sections parallel Right Control surfaces may seem too small first glance adequate conceivable maneuver keep hinge gaps small possible maximum efficiency model its just arent very hard build correctly critical step constructing airplanes tail proper choice wood gram build tail will add about five grams weight fin ished model Overbuilding will force compensate extra nose weight Worse still may try fly adding extra weight Add extra nose weight performance suffers Sidestep problem model wont fly Obviously building tail too heavy puts quandary best avoided ideal wood Sparrow tail surfacesbalsa 6- 8-lb-per-cu-ft classeliminates need add nose weight However form need balsa usually hard find Whats wanted stiff firm grade bal sa punky material feels like Styrofoam type balsa also wood choice building Hand-Launched Glider wings Free Flighters hoard like treasure mentioning possibility getting some stuff Free Flighter would probably fool hardy Dont try substitute 3A6-in balsa A-in thickness specified plans extra thickness needed lend adequate stiffness horizontal stabilizer ra tionale based having seen just about stab failures wing failures stabilizers get pounding flight theyre also subject getting hung door jambs trunk lids because promi nence Stabs built A-in balsa can stand abuse wont come apart until break off against ground As shown plans Ive made up edges fin rudder using strips grain running parallel edge purpose simply make edges easier round well help hold tail straight Since pieces A-in balsa small tend warp toO badly strips optional save having round end grain surfaces cant well enough suit stan dards use strips elevators joined either strip hardwood dowel square fiber glass cloth may folded over dowel leading edge elevator rein force joint will also strengthen area elevator horn mounted Trim cloth away slot 30 Model Aviation fuselage resist urge make slot elevator smaller Although clearance may seem excessive now can quickly become inadequate tail gets wet fuselage swells just tad situation elevator will jamand happens flight over maybe good Sand leading edges rudder elevator housetop-shaped point set hinges wood until hinge pin centerlines point housetop will allow leave very small gap hinge line MonoKote hinges may used preferred because particular geometry might necessary enlarge hole fuse lage order clear greater motion elevator joiner Fuselage Underestimating structural importance fuselage seems fairly common error among modelers Ap parently such builders assume func tion fuselage merely hold wing tail proper juxtaposition oversimplification Any part model exposed airflow has impact performance reality Continued page 32 Left If use older large radio like installation will tight impossible Using smaller servos ana u mn Dattery pack makes things easier saves weight Right Mounting aileron servo flat wing gives room between other servos ORDERS SHIPPED DAY RECEIVED WARBIRD VIDEOS VHS OR BETA OUR 23RD YEAR SPE6IA[ IWTRODO6IORY OFFER WARBIRD CHECKOUT VOL 1 Flying P-40 Warhawk Corsair Hellcat SB2-A Buccanneer Avenger NF 1325 Programs2 Hr Only $3995 ANY TWO VIDEOS ONLY $7595 ANY 3 VIDEOS ONLY $10795 AILS VIDEOS ONLY $19995 WARBIRD CHECKOUT VOL 11 Flying P-38 Mitchell Bomber P61 Black Widow Invader NF 1454 Programs100 Mm Only $3995 WARBIRD CHECKOUT VOL III Flying P-51 Mustang A-20 Bomber P-39 Introduction P-39 Advanced NF 1514 Programslb Mm Only $3995 CALL TOLL FREE IT CARDS LJ Day Night California outside USA Shipping Paid Continental USForeign add $500nts add 6 1/2% tax NF VIDEO LIBRARY 13470 WASHINGTON BLVD STE 207 MARINA DEL REY CA 90292 fuselage has much greater effect average modeler credits As fin rudder effect primarily flight direction fuse lage has exposed area fin rudder no matter what input give airplane swaybacked fuse lage will never fly straight enough suit model has crooked fuselage will fly straight speed trim will Because very tall narrow fuselage Sparrow actually functions like flight surface allowing plane perform knifeedge flight gracefully larger models its particularly important build straight mild bend fuselage sides facilitates very careful choos ing wood two sides dont have equal degree springiness fu selage almost fated come out crooked Start making up left right side wing saddle doublers spruce tank hatch strips pieces installed before sides joined intend install engine larger 19 engine have mind very hot before assembling fuse lage sides might fiberglass inside forward area say wing doubler up 6-oz glass cloth Hot Stuff isnt necessary stay engine-size limits dictated design have never yet seen model some didnt eventually subject over sized engine firewall made up two layers %-in ply Glue together installa tion later Drill hole wing dowel No 3 former have favorite method locating hole follow location specified plans exactly Slight incidence misalignments may scarcely noticed larger model will very detrimental model small Make cutouts No 4 former through pushrods extend rear model Adapt parameters cutouts shown plans suit radio necessary dont weaken area wing bolt block attaches Af ter have decided cutout patterns made sure formers configured radio glue No 3 4 formers fuselage sides Use triangle get formers square side other side glued top fu selage laid flat workbench Draw two sides together form tail very careful twists get built fuselage can traced operation Glue firewall using epoxy fast-setting glues have much improved last few years serve well purposes have better luck epoxy very high-vibration applications top block made very light A-in balsa sheet punky stuff took pains avoid building tail fine long its extremely light Dont hollow out unless unable oh32 Model AviationContinued page 34 Last An Automatic Full-Feathering Adjustable Pitch Propeller An exclusive patented 4 mechanism lets adjust pitch 8-4O optimum perfor mance blades automa tically feather when motor stops reduce drag give much Recommended 72-80 motor gliders similar models wing 4 loads up 14 ozI sq ft 05 direct e systems 1/ drive shaft Stock No MAO8XXE $2495 Suggested Retail Available Through Leading Distributors WINDSOR PROPELLER CO 384 Tesconi Ct Santa Rosa CA 95401 WARBIRD CHECKOUT VOL V Flying 8-29 Pre-Flightof BI7E Flight 8-24 NF 1553 Programsi 07 Mm Only $3995 WARBIRD CHECKOUT VOL IV Flying P-47 3 parts Flying T-6 3 parts NF 1366 Programslb MIn Only $3995 MODERN JET FIGHTER Flying F/A18 Hornet Eagle 6 F16C nnl Th4 ndohieds AC Custom Aviation Prints Original Pai Custom made photo prints ot several recent Model Builder COVER PAINTINGS Bob Benjamin now available INCLUDING Cl Prints future Model Builder COVER PAINTINGS will also available have something special mind Bob pleased discuss creating new originals custom commission basis ooorplete detale ne ordering prhits Inquire out alginat pairIngs oMI writ Robert Benjamin Aviation Art 1222 26th Ave NE Olympia WA 98506 206 352-2602 Curtiss Jenny * Quality hand-cut kit complete plans rigging scale control setup wire parts pre-bent special hardware included parts individually indentified packaged Decals Major Decal * Engine sizes 20 40 FS 25 TS * Wing unit removes four screws less 3 minutes flying wires left intact * Superb flight characteristics Introductory Price 812500 VISA erCard y Order Michigan residents add 4% sitien tax Add $550 P81 US orders $1250 foreign Video Catalog $1250 post incH VHS/Beta $5 rebate wilt roturn tapo kit ordor Reg catalog sample mini-plan *2 Hand-Cut Quality Affordable Price AERODROME MODELS LTD 2623 S Miller Rd ~__Saginaw Ml 48603 517781-3000 Othor Kits Avaiiabie Aero-Pacer Saby -Pacer Gipsy Moth Rybaby Fiybaby combo Hawkor Hurricane Jester tam wood thats sufficiently light because should have enough mass give stiffness fuselage Glue top block onto fuselage add triangle stock can see plans goes almost everywhere Make tail wheel strut /16 music wire Sew little ply former stall rear fuselage lack steerable tail wheel bothers theres no reason add using favorite method doesnt seem necessary model Add strip balsa uprights crosspieces rear fuselage well wing bolt block its triangle rein forcements Sheet bottom assem bly grain running crosswise Make hatch balsa block small plywood squares inserted inner face Attach wood screws small hardwood blocks added inside nose helps control vibration front model allowing hatch take some structural load nose prototype used two points tachment diagonal corners hatch using four plywood squares works much better easy access fuel tank isnt important youre planning stall engine larger recommended 19 size can skip foregoing just glue hatch place Personally like maintainability separate tank hatch Slot top block fin Doing after fuselage assembled ensures accu rate alignment completed fuselage shaped rounding top block hatch chose round off sharp corners behind wing prototype can wish adding triangle stock canopy Sparrow must very narrow fit properly can find ready-made fills bill means use Being unable find canopy narrow enough used Styrofoam custom make prototype After shaping foam suit give coat 2-oz glass cloth epoxy resin Paint prime canopy match model Since canopy factor determining size fin rudder would unwise 34 Model Aviation include model airplanes knife-edge capabilities might diminished model would behave needed dihedral Wing builder encounters biggest challenge Generally wing hardest part model build right other part model want wing warp-free yet its difficult part build warps want honest-flying Sparrow its wing must straight Ensure its straight warp-free before cover once webbing place wing will twist great extent wing area small old trick straightening wing MonoKote will work very poorly Dont rely Make spar carefully selected straight-grained spruce Using very straight-grained wood protects model coming apart air no matter much beating its given Test sam ple seeing can follow grain layer least 10 find piece straighter grain spar joined unusual manner Two strips spruce scraps left over making spars used double joint between spars center wing installed between top bottom caps just like splints 3A6-in ply plate shaped conform wing spar sweep epoxied place after wing joined wing dowel should glued place before wing sheeted ensure strong bond center ribs A-in balsa pieces side wing no stronger joint very certain its accu racy double-check wing straight before web spar webbing should installed very carefully under great deal strain modelers realize dont want have gaps would need filled glue webbing should run along straight vertical best effect Nothing else gives much strength small weight increase does proper web bing prototype I built up ailerons Continued page 36 ct OO J Power W Products Inc Only certified checks money orders accepted Minimum Order glom three packages 4 Pumerpoles $3 per package $t shipping huodhogi CT residents add 70% sales tao Prices nubiect ohange nofice DEALER INQUIRIES INVITED further information dealer paces send SASE Business Card SERMOS RIC SNAP CONNECTORS~ Celar Canes Si 8ox 16787 Stantad CI 069C203322-6294 pieces trailing edge sheeting cut out make aileron wells could over again would simply make solid balsa have indicated plans weight sav ings turned out almost nonexistent construction much timeconsuming making solid ailerons would have recommend using bellcranks because re careful about rig offer least amount play system wing can accommodate Id think twice about substituting something else airplane needs ailerons center time let go stick little stiffness acceptable Once sheeting place cover center joint 6-oz glass cloth ep oxy resin Hot Stuff cutout servo wing sheeting easier make before center section covered glass wing faired fuselage very light balsa block glued top glass wing block bolts should set fairing until bear wing self used 10-32 nylon bolts proto type because ability break away before wing block does However since nylon bolts difficult find some areas can substitute regular A-20 bolts necessary Assembly Bolt wing place true horizontal stabilizer eye much easier sounds Holding model up nose pointed towards change angle model until stab makes line just above top surface wing Adjust stab until paral lel wing measure top center firewall tips stab get proper alignment indicated plan view fin simply fitted slot top block its alignment will no bet ter slot Use triangle get fin square stab such small model misalignments will have magni fied effect exacting can dur ing assembly cowling built up same way canopy its bit difficult make fit perfectly engine its mount mount model tack glue foam blocks around engine up back spinner Mark foam front locate spinner circle Gently remove foam take engine mount off model preserve location spinner circle tack foam back onto model exactly broke off Glue front cowl former onto foam Carve sand foam shape prefer try fancier shape prototype keep lines simple will look odd Remove cowl form model cut off about / out side edge foam back cowl allow thickness fiberglass 36 Model Aviation SNAP POINT KNIFE SAMPLE Blade Included Send $125 Stamps 5/25s please Write Complete Price List Berkeley Trading Co PO Box 26- Dept HB Berkeley Springs WV 25411 258-2 773 THE FOX 50 HERE Light enough 40 size airplanes Powerful enough 60 size airplanes * * * * often have wished little power 40 size model couldnt see potting big heavy 60 up front 11A oz bare Fox 50 fills need energetic user friendly Fox 45 has stretched give extra torque necessary handle 11 prop authority retains its user friendly nature technically minded some pertinent data Bore Stroke Schneurle ported double ball bearing course The crankshaft machined piece SAE 86L20 steel surface hardened tempered crankpin ground before heat treat retain its hard skin The piston cast low expansion 390 alloy fitted free floating piston ring made patented process The 7/32 dia tubular wrist pin retained unique rollpin retaining system results considerable increase bearing area corresponding increase life cylinder hardened steel carefully tapered crossbotched bore sturdy connecting rod machined high strength aluminum bar fitted bronze bushing both ends The cylinder head uses two piece button design results accurate combustion chamber piece casting also has much stronger glow plug thread The crankcase pressure cast 384 alloy considerably stronger alloys manufacturers use Also design utilizes patented high back door feature resists compression stresses better conventional design BUY AND FLY ONE YOU WILL BE HAPPY WITH IT Fox motor test run factory checked idle full power throttla response compression Only motors meet performance standardr sold Most competitors reluctant spend time money check run motors risk spoiling exterior appearance thinli important motors run well finest motor world no good part broken cant get another Fox owners can get part promptly calling 501-646-1656 giving us motot size part name number Visa Mastercard number Duke Fox has building model airplane motors USA since 1943 Labor 100% American material except ball bearings Americar made MANUFACTURING 5305 TOWSON AVENUE FORT SMITH AR 72901 - - _________ PHONE 501 6461656 About three layers 2-oz glass cloth epoxy gives right combination light ness strength cowling will never crack vibration Unlike procedure making can opy foam must melted out cowling make room engine used dope thinner However thinner can cause severe discomfort fire hazard boot Use out doors extreme care An alternative method dig foam out knife cowling mounted small hard wood blocks glued firewall about % edge Use blocks desired long keep out way controls lines engine Very small countersunk wood screws used hold cowling place front former cowling can cut out clear throttle arm Dont cut away too much will rattle run engine Covering finishing MonoKote used prototypeorange fuse lage tail transparent red wings color scheme up sure make easy see small fast model flying away will quickly shrink dot ether want stand out vividly possible Covering model after assembly rather before little trou ble eliminates worry MonoKote between various pieces could interfere glue joints cowling can painted match MonoKote can prime fiberglass Ambroid cement MonoKote cowling fact though its obsolete general model building pur poses Ambroid will wonders making MonoKote stick epoxy firewalls wing center sections Radio engine Radio installation Sparrow tight managed fit old Tower Hobby System 4 radio mon ster servos full-size battery pack smaller radio will give better perform ance easier time installa tion Use battery position balance model can strongly recommend pushrods made wood Nyrod pushrods change length dif ferent temperatures small model can make unacceptable trim changes Dont use servo tape install flight control servos first time around installed Enya 15 plain bearing engine prototype provided enough power liftoff about 40 ft flight 50 mph range pulled vertical model quickly slowed down piloted smoothly airplane would vertical figure eight bigger engine clearly called improve vertical performance Replacing 15 Fox 25 plain bearing engine made difference hoped Upon command model would Continued page 133 s old timer perfeCtly pmportioned modeling Curtiss Robin 049 EngInes -Channel RIC 41 WIngspan ElectrIc Power Optional 82296 00 e03 Very tee lull scale aircraft ideally suited model olast s appealing aid curtiss Robin born spruce linen age beaatifally proportioned rubber electric glow engines Easy fan build trainerlike pertormanca Flyline Models Catalog 505 P5ono 17031 273-0503 FLYLINE MODELS INC PO Sos 2136 Palrtax VirgInia 22031 USA September 1988 37 ONLY 129Y5 INCLUDING SPINNER AND TILT DOWN MUFFLER ITEM NO 25000 Some things should consider comparing Fox 50 other brands ROCKET PLANE xP-1 Valley View Dr Box 43 716 372-8406Allegany NY 14706 Sparrow/Gardner Continued page 37 now dart straight up almost out sight happen have hot 15 20 will fine Please resist urge put 40 model Youd have rebalance airplane point would scarcely flyable unless engine three-quarters full throttle over burdened model would also very hard land Flying Careful trimming will help get out Sparrow Start about 3A5 aileron throw % ele vator throw 1 rudder throw Bal ance model point about % in front center-of-gravity plans Fly way several flights before change anything Quick isnt youll get used after few flights Once feel comfortable model can wring out bit begin get timing right move balance point back indi cated plans will make mod el little quicker yet will also release its snapping spinning potential Snapping maneuvers Sparrows strongest suit airplane will perform two full inside outside vertical snaps still heading straight up afterwards can partial snaps precision Granted intricate tricks like gliding three quarters outside snap knife-edge flight hard learn airplane happy doing Once have sharp ened timing youll find possi bilities almost limifless youre quick enough stirring sticks chances Sparrow will almost ma neuver days hauling flying larger model doesnt seem worth trouble model like Sparrow can really help keep edge Fly singular things alone can model isnt taken seriously least right off bat improvement flying skills definitely will Radio Technique/Myers Continued page 39 Hams required listen before transmit tends limit RE interference no guarantees Any quiet spot band can used Ham operator Charging ahead used Pacific Plan dis tribute Ham-band RC0O-09 channels shown Table 4 because 20-kHz raster because expect cur rent users can obtain Gold Sticker performance Hams should get together group insist moving everything Gold Sticker soon possible tainly 1991 AMA permits even-numbered chan nels sanctioned events Hams lib erty use 10 right now park makes Gold Sticker performance neces sary safe operation 53 MHz six-meter distribution Table 5 per Pacific Plan may neces sary due 100 kHz raster Replacing transmitter batteries times have noticed transmitter out put meter reads lower usual and/or operating time shorter used common problem cell bat tery pack has developed short circuit transmitter still under warranty probably send back manufacturer wait may out warranty and/or dont want wait Decision time find replace bad cell re place whole pack order make decision must re move pack transmitter Step disconnect pack mistakes can make working electronic circuit least forgivable damage components cause too lazy disconnect power supply momentary short circuit wrong place can destroy transmitters electronics So unplug battery pack can cut both wires cant simple matter put Deans connectors 19K54 $155 Ace RIC Inc Box 511E Higginsville MO 64037 cut ends wire want reassemble transmit ter Match wire colors install Deans connectors making sure male plug side transmitter pull pins out isolated contact provide means quick visual check connecting battery pack polarity reversed matter polarity Practically everyone uses Red k y Sribnick told particular case PCM trans mitters Futaha JR Red wire charger k wire meter necessary tool working batteriesand dont assume anything Now have pack hand put number cell using pen paper stick ers attach 20-ohm 10-watt resistor pack monitor voltage cell pack discharging Write down voltages cell five-minute intervals Keep discharg ing pack until cell reads 0 VDC Leave resistor connected wont hurt anything Looking list voltages will tell cells shorted start 0 VDC whether pack balanced cells get 0 VDC about same moment unbalanced dont pack unbalanced remove resistor charge pack overnight re peat test pack still unbalanced suggestion junk because another cell probably going fail Ace R/C sells kinds Ni-Cds probably can supply what needContinued page 134 SPECIALISTS IN CUSTOM COX TEE DEE & REED ENGINES 020S 049 051S & 09S ALL CUSTOM & STOCK PARTS AVAILABLE INDIVIDUALLY MANY NEW PARTS FOR OLD DISCONTINUED COX ENGINES COX PROPS & GLOW HEADS COMPETITION ACCESSORIES & CUSTOMIZED K&B ENGINES ALSO COMPLETE LINE OF RACING PARTS - GLO-BEE FIREBALL & K&B PLUGS SOLID LINES RACING WHEELS QUICK FILLS ETC WE ALSO STOCK CARBON FIBER KLOTZ OIL LATEX & SILICONE FUEL TUBING PEN BLADDER MATERIALS & HARDTO-FIND HARDWARE ESPECIALLY 2-56 & 3-48 SIZES COILS CONDENSERS NGK & STIlT PLUGS SILK 12 COLORS QUALITY DOPE BRUSHES 5 & 7 LOOP RUBBER BANDS KSB SEELIG & IGNITION TIMERS GAS & DIESEL FUEL TUBING TRANSISTOR IGNITION SYSTEMS RESISTOR HI-TENSION LEADS 1/2A TEXACO PLAYBOY SR KIT 1/2A TEXACO ENGINES & PARTS EVERYTHING YOU NEED FOR OLD TIMER EVENTS September 1988 133 TABLE 4 50 MHz Ham Band AircraftlSurfacelOommunications Uses ARRL band plan recognizes assignment RC StalionABCDE 20-kHz raster0003010402 0705080609 OUR REV-UP INVENTORY AVERAGES OVER 9000 PROPS I! CALL FOR IMMEDIATE SHIPMENT ON VISA OR MASTERCARD TABLE 5 6-Meter Ham Band Ai rcraft/Surface/CommuniCationS Uses 100-kHz raster Sta ABCDE 533531534532535 536537538 OLD TIMER SUPPLIES ORDER BY MAIL OR PHONE 619728-4365 SORRY NO COD VISA & MASTERCARD WELCOME DEALER INQUIRES INVITED MINIMUM MERCHANDISE ORDER $1000 SHIPPING & HANDLING FEE $150 FOR INSURANCE ADD $100 ORDERS SHIPPED WITHIN 24 HOURS S ADD 6% TAX
Edition: Model Aviation - 1988/09
Page Numbers: 26, 27, 28, 29, 30, 32, 34, 36, 37, 133
HAVE YOU BUILT small models lately answer follow ing questions yes read lighter scaled-down airplane may just what need right now have spend first hour flying field hands knees assem bling newest 60-powered wonderbird equipped tuned pipe Have ever passed over trip flying field because didnt want go trouble haul ing assembling feeding large model myself have passed up trips field no other reason down about quart glow fuel know quart fuel wont fly model long enough make trip worth right Franidy opinion large models can pain nuisance Propellers run $2 apiece break look wrong Having purchase MonoKote four rolls time Trips flying field awkward best downright uncom fortable worst disassembled cumbersome airplanes take up much room car someone must either hold engine lap hold tail keep blocking drivers line sight rearview mirror did ever notice much farther big models scatter break bigger harder fall certainly holds true flying field Larger models just have wider radius catastrophe Well ever build large models Simply because worth size weight allow fly graceflilly gently easily small models theres no remedy As rule larger models have light er wing loadings due scale effects retain good flight characteristics very high wing loadings cant argue bigger better Scale building Big engines seem easier adjust buy last longer Radios fit right want still leave plenty room other things such re tractable landing gear smoke system Big planes simply have air being serious respectable little ones Brawny appearance isnt everything though Oddly enough sophisti cated models know happen lightestthe Indoor microfilm models Al26 Model Aviation Top Although model quick large horizontal stabilizer prevents having nasty habits other little models bright colors help eyes stay locked onto small high-speed target Aside being fun main objective model hone piloting skills doing minimum Investment money aggravation Take things slowly first few flights sure keep plenty air under trying out new maneuvers S PARROW DESIGNED BY STEVE GARDNER FIBERGLASS COWL SPRUCE SffiRS IN3/3z BALSR RI5 /x FI TESTOCK ILSR STRIP rBRLSA3HEET N- BLSP SHEEJ 25 ENGINE N 7 ZDIA SPINNER 1DiA 1IL WHEEL CE &LSA HATCH 5QMAPLE LANDING GEAR BLOCK4ll j DIR MUSIC WIRE LE- Left Remove prop five sheet metal screws have easy access tne engine tuel tank battery pack engine problems really problems fuel system important have easy access fuel tank Right height firewall makes cowl 15-size engine appear short height front allows larger engines longer cowlings used looking odd Left Our author says has always preferred belicranks actuate ailerons because have least amount play system available also allow aileron servo mounted flat wing save space Right hold thin wire landing gear groove nylon straps slanted puts screw head closer wire applies pressure directly wire though dont say words devotees big models often think smaller-scale airplanes little better toys So big models imposing flying field have other virtues smaller craft offer different compensations lighter birds often very distinctive flying challenges modeler ways big ones dont Small models antidote complacency can stand taken seriously youre game piloting ship will fly smoothly unless fly smoothly reaction time up smaller airplanes unruly manners might just ready think small might just ready sacrifice prestige ease big prepossessing models ex citement knowing youve learned handie airplane competently well youre weary lugging around support gear big model little guy definitely ticket need starting battery pint fuel trans mitter youre ready go Because smaller plane will fit cars having disassembled no tools needed pint fuel will keep air four 10-minute flights smaller model will bounce larger would shatter Above said before lighter bird will keep toes Small models have characteris tic twitchiness dont want fly smooth ly nervous giddy machines al ways quick translate control input abrupt change flight path what amounts much greater con trol authority pilotextra maneuver ability motivated flier can use good advantage practice can learn orchestrate intricate maneuvers can gotten larger airplane fact can learn fly Sparrow smoothly youll able handle anything larger precision never knew Little airplanes train reflexes better fastest video games low inertia models makes possible cer tain maneuvers forbidden larger ones Sparrow will snapping maneu vers like no other airplane have ever flown can start stop snaps literally instan taneously once have required tim ing Eight-sided loops easy too corners sharp Finally smaller models easier build up certain strength Like early Grumman fighters Sparrow de signed nearly indestructible flight Although its slightest overbuilt airplane allows enter abrupt ma neuvers much higher speeds might larger model Its light weight low inertia permit rapid-fire succes sion maneuvers despite its low drag comes time slow down Spar row will lose speed rapidly rather like having built-in glide path control Larger aircraft still rule flying field smaller birds complement nicely could certainly worse build Sparrow stable models learn put want skills control authority youll de velop maneuvering airplane guar anteed carry over flying Construction standard practice build tail surfaces first sort warm-up Tail surfaces easy build too demanding theyre fairly painless way get modeling mood tail surfaces shouldnt carefully constructed rest 28 Model Aviation /4 DIA DOWEL IL SOFT BALSA BLOCK HOLLOWED WING TIPWING PLAN TOP VIEW1/L4 SPRUCE DOUOER CENTER ALL WING SHEETING1/2 ESECT IS 1/16 BALSALG BLOCKS-if -2AV~fl [v32][b-1-10-1-10]] ALL BiC BRACE III/BPLY 1/BPLYDIIEDRAL B MOUNTBRACE ___IW9W __K7 — __- W3W-2 __-U 1 0 WING DIHEDRALAILERON- 3/4 AT EACH TIPHORN1/4 BALSA SHEPTCENTER SECT COVERED I/B BALSADOWEL RETAINERWITH 2 OZ FIBERGLASS -0 Ki7[11ISUB-SPAR HINGEIz3/8 BALSA 3/16 HARD BALSALOCATIONT E STOCK FILL I/B PLY C L FORMER C 1/4 BALSA1/4 TRI SHEETSTOCK P2 Fl F-I S F2 1/16 PLY ____ACE 1/B PLY PLATE IN HATCH FOR HATCHMOUNTING SCREW 1/4 TRI W NG BO T 1F3MOUNT 1/4 TRI-STOCK CZ-. F-IR COWL IS 2 LAYERS OF 6 OZ FIBER GLASS / _____ TYPICAL HARDWOOD/1/8 HD BALSA FUSELAGE BOTTOM COWL MOUNTLBxI/4TYP HARD- WING SADDLEVIEW WOOD HATCH MOUNT BLOCKGLASS COVERED FOAM OR CLEAR COMMERCIAL CANOPY I/B MED BALSA P3FUSELAGE SIDES1/4 TRI-STOCK HO WOOD 7/BLOCK IF-4 2 DA SP NNER ______________________ I/B HO BALSA .5rzz* G SADDLE i ALL RIBS ARE ----..3/32 BALSA SHEET MEDIUM 1/B MED BALSA FUSE SIDES P4 1/4BALSA- SHEET~i STABILIZER ___-—ELEVATORHINGE TO SUIT I/4DOWEL/4 BALSA SHEET 1/8 BALSA1/B PLY GUSSETMOUNT ii7~ ~2I 1/4 BALSA SHEET ___________________IL LIGHT 1/B BALSA SI-EET BOTTOM OMITTED FOR CLARITY7I 1/4 TRI-1/x STOCK/4 BALSA SA STRIP ______/OUTLINES TRI- STOCK 7I' FINRUD \\ 1/4 BALSA SHEET TOP/ I/4BALSA VERY LIGHT 4 4 NYLONSTRIP FORMER1/B BALSA SHEET LSHARDWOODBOLTI/B BALSACROSS GRAIN PLBLOCKSUGHTSHEET BALSA1/8 DIA OS FSR 25V4UIBBLOCKMUSIC WIREFUSELAGE SIDE VIEW ENGINESPRUCELIGHT BALSA BLOCK HATCH 2 DIA WHEELSFull-Size Plans Available See Page 178 /4 BALSA SHEET 1/4 TRI 4K 1/B MED I/B PLY I/B PLY 0I2 345 6 MODEL AVIATION SPARROW DESIGNED BY STEVE GARDNER TRACING BY OE DEMARCO ALL RIGHTS RESERVED Left A dog-leg wire elevator push rod model small mistake would big 60-powered job careful make cross leg short possible sure longer sections parallel Right Control surfaces may seem too small first glance adequate conceivable maneuver keep hinge gaps small possible maximum efficiency model its just arent very hard build correctly critical step constructing airplanes tail proper choice wood gram build tail will add about five grams weight fin ished model Overbuilding will force compensate extra nose weight Worse still may try fly adding extra weight Add extra nose weight performance suffers Sidestep problem model wont fly Obviously building tail too heavy puts quandary best avoided ideal wood Sparrow tail surfacesbalsa 6- 8-lb-per-cu-ft classeliminates need add nose weight However form need balsa usually hard find Whats wanted stiff firm grade bal sa punky material feels like Styrofoam type balsa also wood choice building Hand-Launched Glider wings Free Flighters hoard like treasure mentioning possibility getting some stuff Free Flighter would probably fool hardy Dont try substitute 3A6-in balsa A-in thickness specified plans extra thickness needed lend adequate stiffness horizontal stabilizer ra tionale based having seen just about stab failures wing failures stabilizers get pounding flight theyre also subject getting hung door jambs trunk lids because promi nence Stabs built A-in balsa can stand abuse wont come apart until break off against ground As shown plans Ive made up edges fin rudder using strips grain running parallel edge purpose simply make edges easier round well help hold tail straight Since pieces A-in balsa small tend warp toO badly strips optional save having round end grain surfaces cant well enough suit stan dards use strips elevators joined either strip hardwood dowel square fiber glass cloth may folded over dowel leading edge elevator rein force joint will also strengthen area elevator horn mounted Trim cloth away slot 30 Model Aviation fuselage resist urge make slot elevator smaller Although clearance may seem excessive now can quickly become inadequate tail gets wet fuselage swells just tad situation elevator will jamand happens flight over maybe good Sand leading edges rudder elevator housetop-shaped point set hinges wood until hinge pin centerlines point housetop will allow leave very small gap hinge line MonoKote hinges may used preferred because particular geometry might necessary enlarge hole fuse lage order clear greater motion elevator joiner Fuselage Underestimating structural importance fuselage seems fairly common error among modelers Ap parently such builders assume func tion fuselage merely hold wing tail proper juxtaposition oversimplification Any part model exposed airflow has impact performance reality Continued page 32 Left If use older large radio like installation will tight impossible Using smaller servos ana u mn Dattery pack makes things easier saves weight Right Mounting aileron servo flat wing gives room between other servos ORDERS SHIPPED DAY RECEIVED WARBIRD VIDEOS VHS OR BETA OUR 23RD YEAR SPE6IA[ IWTRODO6IORY OFFER WARBIRD CHECKOUT VOL 1 Flying P-40 Warhawk Corsair Hellcat SB2-A Buccanneer Avenger NF 1325 Programs2 Hr Only $3995 ANY TWO VIDEOS ONLY $7595 ANY 3 VIDEOS ONLY $10795 AILS VIDEOS ONLY $19995 WARBIRD CHECKOUT VOL 11 Flying P-38 Mitchell Bomber P61 Black Widow Invader NF 1454 Programs100 Mm Only $3995 WARBIRD CHECKOUT VOL III Flying P-51 Mustang A-20 Bomber P-39 Introduction P-39 Advanced NF 1514 Programslb Mm Only $3995 CALL TOLL FREE IT CARDS LJ Day Night California outside USA Shipping Paid Continental USForeign add $500nts add 6 1/2% tax NF VIDEO LIBRARY 13470 WASHINGTON BLVD STE 207 MARINA DEL REY CA 90292 fuselage has much greater effect average modeler credits As fin rudder effect primarily flight direction fuse lage has exposed area fin rudder no matter what input give airplane swaybacked fuse lage will never fly straight enough suit model has crooked fuselage will fly straight speed trim will Because very tall narrow fuselage Sparrow actually functions like flight surface allowing plane perform knifeedge flight gracefully larger models its particularly important build straight mild bend fuselage sides facilitates very careful choos ing wood two sides dont have equal degree springiness fu selage almost fated come out crooked Start making up left right side wing saddle doublers spruce tank hatch strips pieces installed before sides joined intend install engine larger 19 engine have mind very hot before assembling fuse lage sides might fiberglass inside forward area say wing doubler up 6-oz glass cloth Hot Stuff isnt necessary stay engine-size limits dictated design have never yet seen model some didnt eventually subject over sized engine firewall made up two layers %-in ply Glue together installa tion later Drill hole wing dowel No 3 former have favorite method locating hole follow location specified plans exactly Slight incidence misalignments may scarcely noticed larger model will very detrimental model small Make cutouts No 4 former through pushrods extend rear model Adapt parameters cutouts shown plans suit radio necessary dont weaken area wing bolt block attaches Af ter have decided cutout patterns made sure formers configured radio glue No 3 4 formers fuselage sides Use triangle get formers square side other side glued top fu selage laid flat workbench Draw two sides together form tail very careful twists get built fuselage can traced operation Glue firewall using epoxy fast-setting glues have much improved last few years serve well purposes have better luck epoxy very high-vibration applications top block made very light A-in balsa sheet punky stuff took pains avoid building tail fine long its extremely light Dont hollow out unless unable oh32 Model AviationContinued page 34 Last An Automatic Full-Feathering Adjustable Pitch Propeller An exclusive patented 4 mechanism lets adjust pitch 8-4O optimum perfor mance blades automa tically feather when motor stops reduce drag give much Recommended 72-80 motor gliders similar models wing 4 loads up 14 ozI sq ft 05 direct e systems 1/ drive shaft Stock No MAO8XXE $2495 Suggested Retail Available Through Leading Distributors WINDSOR PROPELLER CO 384 Tesconi Ct Santa Rosa CA 95401 WARBIRD CHECKOUT VOL V Flying 8-29 Pre-Flightof BI7E Flight 8-24 NF 1553 Programsi 07 Mm Only $3995 WARBIRD CHECKOUT VOL IV Flying P-47 3 parts Flying T-6 3 parts NF 1366 Programslb MIn Only $3995 MODERN JET FIGHTER Flying F/A18 Hornet Eagle 6 F16C nnl Th4 ndohieds AC Custom Aviation Prints Original Pai Custom made photo prints ot several recent Model Builder COVER PAINTINGS Bob Benjamin now available INCLUDING Cl Prints future Model Builder COVER PAINTINGS will also available have something special mind Bob pleased discuss creating new originals custom commission basis ooorplete detale ne ordering prhits Inquire out alginat pairIngs oMI writ Robert Benjamin Aviation Art 1222 26th Ave NE Olympia WA 98506 206 352-2602 Curtiss Jenny * Quality hand-cut kit complete plans rigging scale control setup wire parts pre-bent special hardware included parts individually indentified packaged Decals Major Decal * Engine sizes 20 40 FS 25 TS * Wing unit removes four screws less 3 minutes flying wires left intact * Superb flight characteristics Introductory Price 812500 VISA erCard y Order Michigan residents add 4% sitien tax Add $550 P81 US orders $1250 foreign Video Catalog $1250 post incH VHS/Beta $5 rebate wilt roturn tapo kit ordor Reg catalog sample mini-plan *2 Hand-Cut Quality Affordable Price AERODROME MODELS LTD 2623 S Miller Rd ~__Saginaw Ml 48603 517781-3000 Othor Kits Avaiiabie Aero-Pacer Saby -Pacer Gipsy Moth Rybaby Fiybaby combo Hawkor Hurricane Jester tam wood thats sufficiently light because should have enough mass give stiffness fuselage Glue top block onto fuselage add triangle stock can see plans goes almost everywhere Make tail wheel strut /16 music wire Sew little ply former stall rear fuselage lack steerable tail wheel bothers theres no reason add using favorite method doesnt seem necessary model Add strip balsa uprights crosspieces rear fuselage well wing bolt block its triangle rein forcements Sheet bottom assem bly grain running crosswise Make hatch balsa block small plywood squares inserted inner face Attach wood screws small hardwood blocks added inside nose helps control vibration front model allowing hatch take some structural load nose prototype used two points tachment diagonal corners hatch using four plywood squares works much better easy access fuel tank isnt important youre planning stall engine larger recommended 19 size can skip foregoing just glue hatch place Personally like maintainability separate tank hatch Slot top block fin Doing after fuselage assembled ensures accu rate alignment completed fuselage shaped rounding top block hatch chose round off sharp corners behind wing prototype can wish adding triangle stock canopy Sparrow must very narrow fit properly can find ready-made fills bill means use Being unable find canopy narrow enough used Styrofoam custom make prototype After shaping foam suit give coat 2-oz glass cloth epoxy resin Paint prime canopy match model Since canopy factor determining size fin rudder would unwise 34 Model Aviation include model airplanes knife-edge capabilities might diminished model would behave needed dihedral Wing builder encounters biggest challenge Generally wing hardest part model build right other part model want wing warp-free yet its difficult part build warps want honest-flying Sparrow its wing must straight Ensure its straight warp-free before cover once webbing place wing will twist great extent wing area small old trick straightening wing MonoKote will work very poorly Dont rely Make spar carefully selected straight-grained spruce Using very straight-grained wood protects model coming apart air no matter much beating its given Test sam ple seeing can follow grain layer least 10 find piece straighter grain spar joined unusual manner Two strips spruce scraps left over making spars used double joint between spars center wing installed between top bottom caps just like splints 3A6-in ply plate shaped conform wing spar sweep epoxied place after wing joined wing dowel should glued place before wing sheeted ensure strong bond center ribs A-in balsa pieces side wing no stronger joint very certain its accu racy double-check wing straight before web spar webbing should installed very carefully under great deal strain modelers realize dont want have gaps would need filled glue webbing should run along straight vertical best effect Nothing else gives much strength small weight increase does proper web bing prototype I built up ailerons Continued page 36 ct OO J Power W Products Inc Only certified checks money orders accepted Minimum Order glom three packages 4 Pumerpoles $3 per package $t shipping huodhogi CT residents add 70% sales tao Prices nubiect ohange nofice DEALER INQUIRIES INVITED further information dealer paces send SASE Business Card SERMOS RIC SNAP CONNECTORS~ Celar Canes Si 8ox 16787 Stantad CI 069C203322-6294 pieces trailing edge sheeting cut out make aileron wells could over again would simply make solid balsa have indicated plans weight sav ings turned out almost nonexistent construction much timeconsuming making solid ailerons would have recommend using bellcranks because re careful about rig offer least amount play system wing can accommodate Id think twice about substituting something else airplane needs ailerons center time let go stick little stiffness acceptable Once sheeting place cover center joint 6-oz glass cloth ep oxy resin Hot Stuff cutout servo wing sheeting easier make before center section covered glass wing faired fuselage very light balsa block glued top glass wing block bolts should set fairing until bear wing self used 10-32 nylon bolts proto type because ability break away before wing block does However since nylon bolts difficult find some areas can substitute regular A-20 bolts necessary Assembly Bolt wing place true horizontal stabilizer eye much easier sounds Holding model up nose pointed towards change angle model until stab makes line just above top surface wing Adjust stab until paral lel wing measure top center firewall tips stab get proper alignment indicated plan view fin simply fitted slot top block its alignment will no bet ter slot Use triangle get fin square stab such small model misalignments will have magni fied effect exacting can dur ing assembly cowling built up same way canopy its bit difficult make fit perfectly engine its mount mount model tack glue foam blocks around engine up back spinner Mark foam front locate spinner circle Gently remove foam take engine mount off model preserve location spinner circle tack foam back onto model exactly broke off Glue front cowl former onto foam Carve sand foam shape prefer try fancier shape prototype keep lines simple will look odd Remove cowl form model cut off about / out side edge foam back cowl allow thickness fiberglass 36 Model Aviation SNAP POINT KNIFE SAMPLE Blade Included Send $125 Stamps 5/25s please Write Complete Price List Berkeley Trading Co PO Box 26- Dept HB Berkeley Springs WV 25411 258-2 773 THE FOX 50 HERE Light enough 40 size airplanes Powerful enough 60 size airplanes * * * * often have wished little power 40 size model couldnt see potting big heavy 60 up front 11A oz bare Fox 50 fills need energetic user friendly Fox 45 has stretched give extra torque necessary handle 11 prop authority retains its user friendly nature technically minded some pertinent data Bore Stroke Schneurle ported double ball bearing course The crankshaft machined piece SAE 86L20 steel surface hardened tempered crankpin ground before heat treat retain its hard skin The piston cast low expansion 390 alloy fitted free floating piston ring made patented process The 7/32 dia tubular wrist pin retained unique rollpin retaining system results considerable increase bearing area corresponding increase life cylinder hardened steel carefully tapered crossbotched bore sturdy connecting rod machined high strength aluminum bar fitted bronze bushing both ends The cylinder head uses two piece button design results accurate combustion chamber piece casting also has much stronger glow plug thread The crankcase pressure cast 384 alloy considerably stronger alloys manufacturers use Also design utilizes patented high back door feature resists compression stresses better conventional design BUY AND FLY ONE YOU WILL BE HAPPY WITH IT Fox motor test run factory checked idle full power throttla response compression Only motors meet performance standardr sold Most competitors reluctant spend time money check run motors risk spoiling exterior appearance thinli important motors run well finest motor world no good part broken cant get another Fox owners can get part promptly calling 501-646-1656 giving us motot size part name number Visa Mastercard number Duke Fox has building model airplane motors USA since 1943 Labor 100% American material except ball bearings Americar made MANUFACTURING 5305 TOWSON AVENUE FORT SMITH AR 72901 - - _________ PHONE 501 6461656 About three layers 2-oz glass cloth epoxy gives right combination light ness strength cowling will never crack vibration Unlike procedure making can opy foam must melted out cowling make room engine used dope thinner However thinner can cause severe discomfort fire hazard boot Use out doors extreme care An alternative method dig foam out knife cowling mounted small hard wood blocks glued firewall about % edge Use blocks desired long keep out way controls lines engine Very small countersunk wood screws used hold cowling place front former cowling can cut out clear throttle arm Dont cut away too much will rattle run engine Covering finishing MonoKote used prototypeorange fuse lage tail transparent red wings color scheme up sure make easy see small fast model flying away will quickly shrink dot ether want stand out vividly possible Covering model after assembly rather before little trou ble eliminates worry MonoKote between various pieces could interfere glue joints cowling can painted match MonoKote can prime fiberglass Ambroid cement MonoKote cowling fact though its obsolete general model building pur poses Ambroid will wonders making MonoKote stick epoxy firewalls wing center sections Radio engine Radio installation Sparrow tight managed fit old Tower Hobby System 4 radio mon ster servos full-size battery pack smaller radio will give better perform ance easier time installa tion Use battery position balance model can strongly recommend pushrods made wood Nyrod pushrods change length dif ferent temperatures small model can make unacceptable trim changes Dont use servo tape install flight control servos first time around installed Enya 15 plain bearing engine prototype provided enough power liftoff about 40 ft flight 50 mph range pulled vertical model quickly slowed down piloted smoothly airplane would vertical figure eight bigger engine clearly called improve vertical performance Replacing 15 Fox 25 plain bearing engine made difference hoped Upon command model would Continued page 133 s old timer perfeCtly pmportioned modeling Curtiss Robin 049 EngInes -Channel RIC 41 WIngspan ElectrIc Power Optional 82296 00 e03 Very tee lull scale aircraft ideally suited model olast s appealing aid curtiss Robin born spruce linen age beaatifally proportioned rubber electric glow engines Easy fan build trainerlike pertormanca Flyline Models Catalog 505 P5ono 17031 273-0503 FLYLINE MODELS INC PO Sos 2136 Palrtax VirgInia 22031 USA September 1988 37 ONLY 129Y5 INCLUDING SPINNER AND TILT DOWN MUFFLER ITEM NO 25000 Some things should consider comparing Fox 50 other brands ROCKET PLANE xP-1 Valley View Dr Box 43 716 372-8406Allegany NY 14706 Sparrow/Gardner Continued page 37 now dart straight up almost out sight happen have hot 15 20 will fine Please resist urge put 40 model Youd have rebalance airplane point would scarcely flyable unless engine three-quarters full throttle over burdened model would also very hard land Flying Careful trimming will help get out Sparrow Start about 3A5 aileron throw % ele vator throw 1 rudder throw Bal ance model point about % in front center-of-gravity plans Fly way several flights before change anything Quick isnt youll get used after few flights Once feel comfortable model can wring out bit begin get timing right move balance point back indi cated plans will make mod el little quicker yet will also release its snapping spinning potential Snapping maneuvers Sparrows strongest suit airplane will perform two full inside outside vertical snaps still heading straight up afterwards can partial snaps precision Granted intricate tricks like gliding three quarters outside snap knife-edge flight hard learn airplane happy doing Once have sharp ened timing youll find possi bilities almost limifless youre quick enough stirring sticks chances Sparrow will almost ma neuver days hauling flying larger model doesnt seem worth trouble model like Sparrow can really help keep edge Fly singular things alone can model isnt taken seriously least right off bat improvement flying skills definitely will Radio Technique/Myers Continued page 39 Hams required listen before transmit tends limit RE interference no guarantees Any quiet spot band can used Ham operator Charging ahead used Pacific Plan dis tribute Ham-band RC0O-09 channels shown Table 4 because 20-kHz raster because expect cur rent users can obtain Gold Sticker performance Hams should get together group insist moving everything Gold Sticker soon possible tainly 1991 AMA permits even-numbered chan nels sanctioned events Hams lib erty use 10 right now park makes Gold Sticker performance neces sary safe operation 53 MHz six-meter distribution Table 5 per Pacific Plan may neces sary due 100 kHz raster Replacing transmitter batteries times have noticed transmitter out put meter reads lower usual and/or operating time shorter used common problem cell bat tery pack has developed short circuit transmitter still under warranty probably send back manufacturer wait may out warranty and/or dont want wait Decision time find replace bad cell re place whole pack order make decision must re move pack transmitter Step disconnect pack mistakes can make working electronic circuit least forgivable damage components cause too lazy disconnect power supply momentary short circuit wrong place can destroy transmitters electronics So unplug battery pack can cut both wires cant simple matter put Deans connectors 19K54 $155 Ace RIC Inc Box 511E Higginsville MO 64037 cut ends wire want reassemble transmit ter Match wire colors install Deans connectors making sure male plug side transmitter pull pins out isolated contact provide means quick visual check connecting battery pack polarity reversed matter polarity Practically everyone uses Red k y Sribnick told particular case PCM trans mitters Futaha JR Red wire charger k wire meter necessary tool working batteriesand dont assume anything Now have pack hand put number cell using pen paper stick ers attach 20-ohm 10-watt resistor pack monitor voltage cell pack discharging Write down voltages cell five-minute intervals Keep discharg ing pack until cell reads 0 VDC Leave resistor connected wont hurt anything Looking list voltages will tell cells shorted start 0 VDC whether pack balanced cells get 0 VDC about same moment unbalanced dont pack unbalanced remove resistor charge pack overnight re peat test pack still unbalanced suggestion junk because another cell probably going fail Ace R/C sells kinds Ni-Cds probably can supply what needContinued page 134 SPECIALISTS IN CUSTOM COX TEE DEE & REED ENGINES 020S 049 051S & 09S ALL CUSTOM & STOCK PARTS AVAILABLE INDIVIDUALLY MANY NEW PARTS FOR OLD DISCONTINUED COX ENGINES COX PROPS & GLOW HEADS COMPETITION ACCESSORIES & CUSTOMIZED K&B ENGINES ALSO COMPLETE LINE OF RACING PARTS - GLO-BEE FIREBALL & K&B PLUGS SOLID LINES RACING WHEELS QUICK FILLS ETC WE ALSO STOCK CARBON FIBER KLOTZ OIL LATEX & SILICONE FUEL TUBING PEN BLADDER MATERIALS & HARDTO-FIND HARDWARE ESPECIALLY 2-56 & 3-48 SIZES COILS CONDENSERS NGK & STIlT PLUGS SILK 12 COLORS QUALITY DOPE BRUSHES 5 & 7 LOOP RUBBER BANDS KSB SEELIG & IGNITION TIMERS GAS & DIESEL FUEL TUBING TRANSISTOR IGNITION SYSTEMS RESISTOR HI-TENSION LEADS 1/2A TEXACO PLAYBOY SR KIT 1/2A TEXACO ENGINES & PARTS EVERYTHING YOU NEED FOR OLD TIMER EVENTS September 1988 133 TABLE 4 50 MHz Ham Band AircraftlSurfacelOommunications Uses ARRL band plan recognizes assignment RC StalionABCDE 20-kHz raster0003010402 0705080609 OUR REV-UP INVENTORY AVERAGES OVER 9000 PROPS I! CALL FOR IMMEDIATE SHIPMENT ON VISA OR MASTERCARD TABLE 5 6-Meter Ham Band Ai rcraft/Surface/CommuniCationS Uses 100-kHz raster Sta ABCDE 533531534532535 536537538 OLD TIMER SUPPLIES ORDER BY MAIL OR PHONE 619728-4365 SORRY NO COD VISA & MASTERCARD WELCOME DEALER INQUIRES INVITED MINIMUM MERCHANDISE ORDER $1000 SHIPPING & HANDLING FEE $150 FOR INSURANCE ADD $100 ORDERS SHIPPED WITHIN 24 HOURS S ADD 6% TAX
Edition: Model Aviation - 1988/09
Page Numbers: 26, 27, 28, 29, 30, 32, 34, 36, 37, 133
HAVE YOU BUILT small models lately answer follow ing questions yes read lighter scaled-down airplane may just what need right now have spend first hour flying field hands knees assem bling newest 60-powered wonderbird equipped tuned pipe Have ever passed over trip flying field because didnt want go trouble haul ing assembling feeding large model myself have passed up trips field no other reason down about quart glow fuel know quart fuel wont fly model long enough make trip worth right Franidy opinion large models can pain nuisance Propellers run $2 apiece break look wrong Having purchase MonoKote four rolls time Trips flying field awkward best downright uncom fortable worst disassembled cumbersome airplanes take up much room car someone must either hold engine lap hold tail keep blocking drivers line sight rearview mirror did ever notice much farther big models scatter break bigger harder fall certainly holds true flying field Larger models just have wider radius catastrophe Well ever build large models Simply because worth size weight allow fly graceflilly gently easily small models theres no remedy As rule larger models have light er wing loadings due scale effects retain good flight characteristics very high wing loadings cant argue bigger better Scale building Big engines seem easier adjust buy last longer Radios fit right want still leave plenty room other things such re tractable landing gear smoke system Big planes simply have air being serious respectable little ones Brawny appearance isnt everything though Oddly enough sophisti cated models know happen lightestthe Indoor microfilm models Al26 Model Aviation Top Although model quick large horizontal stabilizer prevents having nasty habits other little models bright colors help eyes stay locked onto small high-speed target Aside being fun main objective model hone piloting skills doing minimum Investment money aggravation Take things slowly first few flights sure keep plenty air under trying out new maneuvers S PARROW DESIGNED BY STEVE GARDNER FIBERGLASS COWL SPRUCE SffiRS IN3/3z BALSR RI5 /x FI TESTOCK ILSR STRIP rBRLSA3HEET N- BLSP SHEEJ 25 ENGINE N 7 ZDIA SPINNER 1DiA 1IL WHEEL CE &LSA HATCH 5QMAPLE LANDING GEAR BLOCK4ll j DIR MUSIC WIRE LE- Left Remove prop five sheet metal screws have easy access tne engine tuel tank battery pack engine problems really problems fuel system important have easy access fuel tank Right height firewall makes cowl 15-size engine appear short height front allows larger engines longer cowlings used looking odd Left Our author says has always preferred belicranks actuate ailerons because have least amount play system available also allow aileron servo mounted flat wing save space Right hold thin wire landing gear groove nylon straps slanted puts screw head closer wire applies pressure directly wire though dont say words devotees big models often think smaller-scale airplanes little better toys So big models imposing flying field have other virtues smaller craft offer different compensations lighter birds often very distinctive flying challenges modeler ways big ones dont Small models antidote complacency can stand taken seriously youre game piloting ship will fly smoothly unless fly smoothly reaction time up smaller airplanes unruly manners might just ready think small might just ready sacrifice prestige ease big prepossessing models ex citement knowing youve learned handie airplane competently well youre weary lugging around support gear big model little guy definitely ticket need starting battery pint fuel trans mitter youre ready go Because smaller plane will fit cars having disassembled no tools needed pint fuel will keep air four 10-minute flights smaller model will bounce larger would shatter Above said before lighter bird will keep toes Small models have characteris tic twitchiness dont want fly smooth ly nervous giddy machines al ways quick translate control input abrupt change flight path what amounts much greater con trol authority pilotextra maneuver ability motivated flier can use good advantage practice can learn orchestrate intricate maneuvers can gotten larger airplane fact can learn fly Sparrow smoothly youll able handle anything larger precision never knew Little airplanes train reflexes better fastest video games low inertia models makes possible cer tain maneuvers forbidden larger ones Sparrow will snapping maneu vers like no other airplane have ever flown can start stop snaps literally instan taneously once have required tim ing Eight-sided loops easy too corners sharp Finally smaller models easier build up certain strength Like early Grumman fighters Sparrow de signed nearly indestructible flight Although its slightest overbuilt airplane allows enter abrupt ma neuvers much higher speeds might larger model Its light weight low inertia permit rapid-fire succes sion maneuvers despite its low drag comes time slow down Spar row will lose speed rapidly rather like having built-in glide path control Larger aircraft still rule flying field smaller birds complement nicely could certainly worse build Sparrow stable models learn put want skills control authority youll de velop maneuvering airplane guar anteed carry over flying Construction standard practice build tail surfaces first sort warm-up Tail surfaces easy build too demanding theyre fairly painless way get modeling mood tail surfaces shouldnt carefully constructed rest 28 Model Aviation /4 DIA DOWEL IL SOFT BALSA BLOCK HOLLOWED WING TIPWING PLAN TOP VIEW1/L4 SPRUCE DOUOER CENTER ALL WING SHEETING1/2 ESECT IS 1/16 BALSALG BLOCKS-if -2AV~fl [v32][b-1-10-1-10]] ALL BiC BRACE III/BPLY 1/BPLYDIIEDRAL B MOUNTBRACE ___IW9W __K7 — __- W3W-2 __-U 1 0 WING DIHEDRALAILERON- 3/4 AT EACH TIPHORN1/4 BALSA SHEPTCENTER SECT COVERED I/B BALSADOWEL RETAINERWITH 2 OZ FIBERGLASS -0 Ki7[11ISUB-SPAR HINGEIz3/8 BALSA 3/16 HARD BALSALOCATIONT E STOCK FILL I/B PLY C L FORMER C 1/4 BALSA1/4 TRI SHEETSTOCK P2 Fl F-I S F2 1/16 PLY ____ACE 1/B PLY PLATE IN HATCH FOR HATCHMOUNTING SCREW 1/4 TRI W NG BO T 1F3MOUNT 1/4 TRI-STOCK CZ-. F-IR COWL IS 2 LAYERS OF 6 OZ FIBER GLASS / _____ TYPICAL HARDWOOD/1/8 HD BALSA FUSELAGE BOTTOM COWL MOUNTLBxI/4TYP HARD- WING SADDLEVIEW WOOD HATCH MOUNT BLOCKGLASS COVERED FOAM OR CLEAR COMMERCIAL CANOPY I/B MED BALSA P3FUSELAGE SIDES1/4 TRI-STOCK HO WOOD 7/BLOCK IF-4 2 DA SP NNER ______________________ I/B HO BALSA .5rzz* G SADDLE i ALL RIBS ARE ----..3/32 BALSA SHEET MEDIUM 1/B MED BALSA FUSE SIDES P4 1/4BALSA- SHEET~i STABILIZER ___-—ELEVATORHINGE TO SUIT I/4DOWEL/4 BALSA SHEET 1/8 BALSA1/B PLY GUSSETMOUNT ii7~ ~2I 1/4 BALSA SHEET ___________________IL LIGHT 1/B BALSA SI-EET BOTTOM OMITTED FOR CLARITY7I 1/4 TRI-1/x STOCK/4 BALSA SA STRIP ______/OUTLINES TRI- STOCK 7I' FINRUD \\ 1/4 BALSA SHEET TOP/ I/4BALSA VERY LIGHT 4 4 NYLONSTRIP FORMER1/B BALSA SHEET LSHARDWOODBOLTI/B BALSACROSS GRAIN PLBLOCKSUGHTSHEET BALSA1/8 DIA OS FSR 25V4UIBBLOCKMUSIC WIREFUSELAGE SIDE VIEW ENGINESPRUCELIGHT BALSA BLOCK HATCH 2 DIA WHEELSFull-Size Plans Available See Page 178 /4 BALSA SHEET 1/4 TRI 4K 1/B MED I/B PLY I/B PLY 0I2 345 6 MODEL AVIATION SPARROW DESIGNED BY STEVE GARDNER TRACING BY OE DEMARCO ALL RIGHTS RESERVED Left A dog-leg wire elevator push rod model small mistake would big 60-powered job careful make cross leg short possible sure longer sections parallel Right Control surfaces may seem too small first glance adequate conceivable maneuver keep hinge gaps small possible maximum efficiency model its just arent very hard build correctly critical step constructing airplanes tail proper choice wood gram build tail will add about five grams weight fin ished model Overbuilding will force compensate extra nose weight Worse still may try fly adding extra weight Add extra nose weight performance suffers Sidestep problem model wont fly Obviously building tail too heavy puts quandary best avoided ideal wood Sparrow tail surfacesbalsa 6- 8-lb-per-cu-ft classeliminates need add nose weight However form need balsa usually hard find Whats wanted stiff firm grade bal sa punky material feels like Styrofoam type balsa also wood choice building Hand-Launched Glider wings Free Flighters hoard like treasure mentioning possibility getting some stuff Free Flighter would probably fool hardy Dont try substitute 3A6-in balsa A-in thickness specified plans extra thickness needed lend adequate stiffness horizontal stabilizer ra tionale based having seen just about stab failures wing failures stabilizers get pounding flight theyre also subject getting hung door jambs trunk lids because promi nence Stabs built A-in balsa can stand abuse wont come apart until break off against ground As shown plans Ive made up edges fin rudder using strips grain running parallel edge purpose simply make edges easier round well help hold tail straight Since pieces A-in balsa small tend warp toO badly strips optional save having round end grain surfaces cant well enough suit stan dards use strips elevators joined either strip hardwood dowel square fiber glass cloth may folded over dowel leading edge elevator rein force joint will also strengthen area elevator horn mounted Trim cloth away slot 30 Model Aviation fuselage resist urge make slot elevator smaller Although clearance may seem excessive now can quickly become inadequate tail gets wet fuselage swells just tad situation elevator will jamand happens flight over maybe good Sand leading edges rudder elevator housetop-shaped point set hinges wood until hinge pin centerlines point housetop will allow leave very small gap hinge line MonoKote hinges may used preferred because particular geometry might necessary enlarge hole fuse lage order clear greater motion elevator joiner Fuselage Underestimating structural importance fuselage seems fairly common error among modelers Ap parently such builders assume func tion fuselage merely hold wing tail proper juxtaposition oversimplification Any part model exposed airflow has impact performance reality Continued page 32 Left If use older large radio like installation will tight impossible Using smaller servos ana u mn Dattery pack makes things easier saves weight Right Mounting aileron servo flat wing gives room between other servos ORDERS SHIPPED DAY RECEIVED WARBIRD VIDEOS VHS OR BETA OUR 23RD YEAR SPE6IA[ IWTRODO6IORY OFFER WARBIRD CHECKOUT VOL 1 Flying P-40 Warhawk Corsair Hellcat SB2-A Buccanneer Avenger NF 1325 Programs2 Hr Only $3995 ANY TWO VIDEOS ONLY $7595 ANY 3 VIDEOS ONLY $10795 AILS VIDEOS ONLY $19995 WARBIRD CHECKOUT VOL 11 Flying P-38 Mitchell Bomber P61 Black Widow Invader NF 1454 Programs100 Mm Only $3995 WARBIRD CHECKOUT VOL III Flying P-51 Mustang A-20 Bomber P-39 Introduction P-39 Advanced NF 1514 Programslb Mm Only $3995 CALL TOLL FREE IT CARDS LJ Day Night California outside USA Shipping Paid Continental USForeign add $500nts add 6 1/2% tax NF VIDEO LIBRARY 13470 WASHINGTON BLVD STE 207 MARINA DEL REY CA 90292 fuselage has much greater effect average modeler credits As fin rudder effect primarily flight direction fuse lage has exposed area fin rudder no matter what input give airplane swaybacked fuse lage will never fly straight enough suit model has crooked fuselage will fly straight speed trim will Because very tall narrow fuselage Sparrow actually functions like flight surface allowing plane perform knifeedge flight gracefully larger models its particularly important build straight mild bend fuselage sides facilitates very careful choos ing wood two sides dont have equal degree springiness fu selage almost fated come out crooked Start making up left right side wing saddle doublers spruce tank hatch strips pieces installed before sides joined intend install engine larger 19 engine have mind very hot before assembling fuse lage sides might fiberglass inside forward area say wing doubler up 6-oz glass cloth Hot Stuff isnt necessary stay engine-size limits dictated design have never yet seen model some didnt eventually subject over sized engine firewall made up two layers %-in ply Glue together installa tion later Drill hole wing dowel No 3 former have favorite method locating hole follow location specified plans exactly Slight incidence misalignments may scarcely noticed larger model will very detrimental model small Make cutouts No 4 former through pushrods extend rear model Adapt parameters cutouts shown plans suit radio necessary dont weaken area wing bolt block attaches Af ter have decided cutout patterns made sure formers configured radio glue No 3 4 formers fuselage sides Use triangle get formers square side other side glued top fu selage laid flat workbench Draw two sides together form tail very careful twists get built fuselage can traced operation Glue firewall using epoxy fast-setting glues have much improved last few years serve well purposes have better luck epoxy very high-vibration applications top block made very light A-in balsa sheet punky stuff took pains avoid building tail fine long its extremely light Dont hollow out unless unable oh32 Model AviationContinued page 34 Last An Automatic Full-Feathering Adjustable Pitch Propeller An exclusive patented 4 mechanism lets adjust pitch 8-4O optimum perfor mance blades automa tically feather when motor stops reduce drag give much Recommended 72-80 motor gliders similar models wing 4 loads up 14 ozI sq ft 05 direct e systems 1/ drive shaft Stock No MAO8XXE $2495 Suggested Retail Available Through Leading Distributors WINDSOR PROPELLER CO 384 Tesconi Ct Santa Rosa CA 95401 WARBIRD CHECKOUT VOL V Flying 8-29 Pre-Flightof BI7E Flight 8-24 NF 1553 Programsi 07 Mm Only $3995 WARBIRD CHECKOUT VOL IV Flying P-47 3 parts Flying T-6 3 parts NF 1366 Programslb MIn Only $3995 MODERN JET FIGHTER Flying F/A18 Hornet Eagle 6 F16C nnl Th4 ndohieds AC Custom Aviation Prints Original Pai Custom made photo prints ot several recent Model Builder COVER PAINTINGS Bob Benjamin now available INCLUDING Cl Prints future Model Builder COVER PAINTINGS will also available have something special mind Bob pleased discuss creating new originals custom commission basis ooorplete detale ne ordering prhits Inquire out alginat pairIngs oMI writ Robert Benjamin Aviation Art 1222 26th Ave NE Olympia WA 98506 206 352-2602 Curtiss Jenny * Quality hand-cut kit complete plans rigging scale control setup wire parts pre-bent special hardware included parts individually indentified packaged Decals Major Decal * Engine sizes 20 40 FS 25 TS * Wing unit removes four screws less 3 minutes flying wires left intact * Superb flight characteristics Introductory Price 812500 VISA erCard y Order Michigan residents add 4% sitien tax Add $550 P81 US orders $1250 foreign Video Catalog $1250 post incH VHS/Beta $5 rebate wilt roturn tapo kit ordor Reg catalog sample mini-plan *2 Hand-Cut Quality Affordable Price AERODROME MODELS LTD 2623 S Miller Rd ~__Saginaw Ml 48603 517781-3000 Othor Kits Avaiiabie Aero-Pacer Saby -Pacer Gipsy Moth Rybaby Fiybaby combo Hawkor Hurricane Jester tam wood thats sufficiently light because should have enough mass give stiffness fuselage Glue top block onto fuselage add triangle stock can see plans goes almost everywhere Make tail wheel strut /16 music wire Sew little ply former stall rear fuselage lack steerable tail wheel bothers theres no reason add using favorite method doesnt seem necessary model Add strip balsa uprights crosspieces rear fuselage well wing bolt block its triangle rein forcements Sheet bottom assem bly grain running crosswise Make hatch balsa block small plywood squares inserted inner face Attach wood screws small hardwood blocks added inside nose helps control vibration front model allowing hatch take some structural load nose prototype used two points tachment diagonal corners hatch using four plywood squares works much better easy access fuel tank isnt important youre planning stall engine larger recommended 19 size can skip foregoing just glue hatch place Personally like maintainability separate tank hatch Slot top block fin Doing after fuselage assembled ensures accu rate alignment completed fuselage shaped rounding top block hatch chose round off sharp corners behind wing prototype can wish adding triangle stock canopy Sparrow must very narrow fit properly can find ready-made fills bill means use Being unable find canopy narrow enough used Styrofoam custom make prototype After shaping foam suit give coat 2-oz glass cloth epoxy resin Paint prime canopy match model Since canopy factor determining size fin rudder would unwise 34 Model Aviation include model airplanes knife-edge capabilities might diminished model would behave needed dihedral Wing builder encounters biggest challenge Generally wing hardest part model build right other part model want wing warp-free yet its difficult part build warps want honest-flying Sparrow its wing must straight Ensure its straight warp-free before cover once webbing place wing will twist great extent wing area small old trick straightening wing MonoKote will work very poorly Dont rely Make spar carefully selected straight-grained spruce Using very straight-grained wood protects model coming apart air no matter much beating its given Test sam ple seeing can follow grain layer least 10 find piece straighter grain spar joined unusual manner Two strips spruce scraps left over making spars used double joint between spars center wing installed between top bottom caps just like splints 3A6-in ply plate shaped conform wing spar sweep epoxied place after wing joined wing dowel should glued place before wing sheeted ensure strong bond center ribs A-in balsa pieces side wing no stronger joint very certain its accu racy double-check wing straight before web spar webbing should installed very carefully under great deal strain modelers realize dont want have gaps would need filled glue webbing should run along straight vertical best effect Nothing else gives much strength small weight increase does proper web bing prototype I built up ailerons Continued page 36 ct OO J Power W Products Inc Only certified checks money orders accepted Minimum Order glom three packages 4 Pumerpoles $3 per package $t shipping huodhogi CT residents add 70% sales tao Prices nubiect ohange nofice DEALER INQUIRIES INVITED further information dealer paces send SASE Business Card SERMOS RIC SNAP CONNECTORS~ Celar Canes Si 8ox 16787 Stantad CI 069C203322-6294 pieces trailing edge sheeting cut out make aileron wells could over again would simply make solid balsa have indicated plans weight sav ings turned out almost nonexistent construction much timeconsuming making solid ailerons would have recommend using bellcranks because re careful about rig offer least amount play system wing can accommodate Id think twice about substituting something else airplane needs ailerons center time let go stick little stiffness acceptable Once sheeting place cover center joint 6-oz glass cloth ep oxy resin Hot Stuff cutout servo wing sheeting easier make before center section covered glass wing faired fuselage very light balsa block glued top glass wing block bolts should set fairing until bear wing self used 10-32 nylon bolts proto type because ability break away before wing block does However since nylon bolts difficult find some areas can substitute regular A-20 bolts necessary Assembly Bolt wing place true horizontal stabilizer eye much easier sounds Holding model up nose pointed towards change angle model until stab makes line just above top surface wing Adjust stab until paral lel wing measure top center firewall tips stab get proper alignment indicated plan view fin simply fitted slot top block its alignment will no bet ter slot Use triangle get fin square stab such small model misalignments will have magni fied effect exacting can dur ing assembly cowling built up same way canopy its bit difficult make fit perfectly engine its mount mount model tack glue foam blocks around engine up back spinner Mark foam front locate spinner circle Gently remove foam take engine mount off model preserve location spinner circle tack foam back onto model exactly broke off Glue front cowl former onto foam Carve sand foam shape prefer try fancier shape prototype keep lines simple will look odd Remove cowl form model cut off about / out side edge foam back cowl allow thickness fiberglass 36 Model Aviation SNAP POINT KNIFE SAMPLE Blade Included Send $125 Stamps 5/25s please Write Complete Price List Berkeley Trading Co PO Box 26- Dept HB Berkeley Springs WV 25411 258-2 773 THE FOX 50 HERE Light enough 40 size airplanes Powerful enough 60 size airplanes * * * * often have wished little power 40 size model couldnt see potting big heavy 60 up front 11A oz bare Fox 50 fills need energetic user friendly Fox 45 has stretched give extra torque necessary handle 11 prop authority retains its user friendly nature technically minded some pertinent data Bore Stroke Schneurle ported double ball bearing course The crankshaft machined piece SAE 86L20 steel surface hardened tempered crankpin ground before heat treat retain its hard skin The piston cast low expansion 390 alloy fitted free floating piston ring made patented process The 7/32 dia tubular wrist pin retained unique rollpin retaining system results considerable increase bearing area corresponding increase life cylinder hardened steel carefully tapered crossbotched bore sturdy connecting rod machined high strength aluminum bar fitted bronze bushing both ends The cylinder head uses two piece button design results accurate combustion chamber piece casting also has much stronger glow plug thread The crankcase pressure cast 384 alloy considerably stronger alloys manufacturers use Also design utilizes patented high back door feature resists compression stresses better conventional design BUY AND FLY ONE YOU WILL BE HAPPY WITH IT Fox motor test run factory checked idle full power throttla response compression Only motors meet performance standardr sold Most competitors reluctant spend time money check run motors risk spoiling exterior appearance thinli important motors run well finest motor world no good part broken cant get another Fox owners can get part promptly calling 501-646-1656 giving us motot size part name number Visa Mastercard number Duke Fox has building model airplane motors USA since 1943 Labor 100% American material except ball bearings Americar made MANUFACTURING 5305 TOWSON AVENUE FORT SMITH AR 72901 - - _________ PHONE 501 6461656 About three layers 2-oz glass cloth epoxy gives right combination light ness strength cowling will never crack vibration Unlike procedure making can opy foam must melted out cowling make room engine used dope thinner However thinner can cause severe discomfort fire hazard boot Use out doors extreme care An alternative method dig foam out knife cowling mounted small hard wood blocks glued firewall about % edge Use blocks desired long keep out way controls lines engine Very small countersunk wood screws used hold cowling place front former cowling can cut out clear throttle arm Dont cut away too much will rattle run engine Covering finishing MonoKote used prototypeorange fuse lage tail transparent red wings color scheme up sure make easy see small fast model flying away will quickly shrink dot ether want stand out vividly possible Covering model after assembly rather before little trou ble eliminates worry MonoKote between various pieces could interfere glue joints cowling can painted match MonoKote can prime fiberglass Ambroid cement MonoKote cowling fact though its obsolete general model building pur poses Ambroid will wonders making MonoKote stick epoxy firewalls wing center sections Radio engine Radio installation Sparrow tight managed fit old Tower Hobby System 4 radio mon ster servos full-size battery pack smaller radio will give better perform ance easier time installa tion Use battery position balance model can strongly recommend pushrods made wood Nyrod pushrods change length dif ferent temperatures small model can make unacceptable trim changes Dont use servo tape install flight control servos first time around installed Enya 15 plain bearing engine prototype provided enough power liftoff about 40 ft flight 50 mph range pulled vertical model quickly slowed down piloted smoothly airplane would vertical figure eight bigger engine clearly called improve vertical performance Replacing 15 Fox 25 plain bearing engine made difference hoped Upon command model would Continued page 133 s old timer perfeCtly pmportioned modeling Curtiss Robin 049 EngInes -Channel RIC 41 WIngspan ElectrIc Power Optional 82296 00 e03 Very tee lull scale aircraft ideally suited model olast s appealing aid curtiss Robin born spruce linen age beaatifally proportioned rubber electric glow engines Easy fan build trainerlike pertormanca Flyline Models Catalog 505 P5ono 17031 273-0503 FLYLINE MODELS INC PO Sos 2136 Palrtax VirgInia 22031 USA September 1988 37 ONLY 129Y5 INCLUDING SPINNER AND TILT DOWN MUFFLER ITEM NO 25000 Some things should consider comparing Fox 50 other brands ROCKET PLANE xP-1 Valley View Dr Box 43 716 372-8406Allegany NY 14706 Sparrow/Gardner Continued page 37 now dart straight up almost out sight happen have hot 15 20 will fine Please resist urge put 40 model Youd have rebalance airplane point would scarcely flyable unless engine three-quarters full throttle over burdened model would also very hard land Flying Careful trimming will help get out Sparrow Start about 3A5 aileron throw % ele vator throw 1 rudder throw Bal ance model point about % in front center-of-gravity plans Fly way several flights before change anything Quick isnt youll get used after few flights Once feel comfortable model can wring out bit begin get timing right move balance point back indi cated plans will make mod el little quicker yet will also release its snapping spinning potential Snapping maneuvers Sparrows strongest suit airplane will perform two full inside outside vertical snaps still heading straight up afterwards can partial snaps precision Granted intricate tricks like gliding three quarters outside snap knife-edge flight hard learn airplane happy doing Once have sharp ened timing youll find possi bilities almost limifless youre quick enough stirring sticks chances Sparrow will almost ma neuver days hauling flying larger model doesnt seem worth trouble model like Sparrow can really help keep edge Fly singular things alone can model isnt taken seriously least right off bat improvement flying skills definitely will Radio Technique/Myers Continued page 39 Hams required listen before transmit tends limit RE interference no guarantees Any quiet spot band can used Ham operator Charging ahead used Pacific Plan dis tribute Ham-band RC0O-09 channels shown Table 4 because 20-kHz raster because expect cur rent users can obtain Gold Sticker performance Hams should get together group insist moving everything Gold Sticker soon possible tainly 1991 AMA permits even-numbered chan nels sanctioned events Hams lib erty use 10 right now park makes Gold Sticker performance neces sary safe operation 53 MHz six-meter distribution Table 5 per Pacific Plan may neces sary due 100 kHz raster Replacing transmitter batteries times have noticed transmitter out put meter reads lower usual and/or operating time shorter used common problem cell bat tery pack has developed short circuit transmitter still under warranty probably send back manufacturer wait may out warranty and/or dont want wait Decision time find replace bad cell re place whole pack order make decision must re move pack transmitter Step disconnect pack mistakes can make working electronic circuit least forgivable damage components cause too lazy disconnect power supply momentary short circuit wrong place can destroy transmitters electronics So unplug battery pack can cut both wires cant simple matter put Deans connectors 19K54 $155 Ace RIC Inc Box 511E Higginsville MO 64037 cut ends wire want reassemble transmit ter Match wire colors install Deans connectors making sure male plug side transmitter pull pins out isolated contact provide means quick visual check connecting battery pack polarity reversed matter polarity Practically everyone uses Red k y Sribnick told particular case PCM trans mitters Futaha JR Red wire charger k wire meter necessary tool working batteriesand dont assume anything Now have pack hand put number cell using pen paper stick ers attach 20-ohm 10-watt resistor pack monitor voltage cell pack discharging Write down voltages cell five-minute intervals Keep discharg ing pack until cell reads 0 VDC Leave resistor connected wont hurt anything Looking list voltages will tell cells shorted start 0 VDC whether pack balanced cells get 0 VDC about same moment unbalanced dont pack unbalanced remove resistor charge pack overnight re peat test pack still unbalanced suggestion junk because another cell probably going fail Ace R/C sells kinds Ni-Cds probably can supply what needContinued page 134 SPECIALISTS IN CUSTOM COX TEE DEE & REED ENGINES 020S 049 051S & 09S ALL CUSTOM & STOCK PARTS AVAILABLE INDIVIDUALLY MANY NEW PARTS FOR OLD DISCONTINUED COX ENGINES COX PROPS & GLOW HEADS COMPETITION ACCESSORIES & CUSTOMIZED K&B ENGINES ALSO COMPLETE LINE OF RACING PARTS - GLO-BEE FIREBALL & K&B PLUGS SOLID LINES RACING WHEELS QUICK FILLS ETC WE ALSO STOCK CARBON FIBER KLOTZ OIL LATEX & SILICONE FUEL TUBING PEN BLADDER MATERIALS & HARDTO-FIND HARDWARE ESPECIALLY 2-56 & 3-48 SIZES COILS CONDENSERS NGK & STIlT PLUGS SILK 12 COLORS QUALITY DOPE BRUSHES 5 & 7 LOOP RUBBER BANDS KSB SEELIG & IGNITION TIMERS GAS & DIESEL FUEL TUBING TRANSISTOR IGNITION SYSTEMS RESISTOR HI-TENSION LEADS 1/2A TEXACO PLAYBOY SR KIT 1/2A TEXACO ENGINES & PARTS EVERYTHING YOU NEED FOR OLD TIMER EVENTS September 1988 133 TABLE 4 50 MHz Ham Band AircraftlSurfacelOommunications Uses ARRL band plan recognizes assignment RC StalionABCDE 20-kHz raster0003010402 0705080609 OUR REV-UP INVENTORY AVERAGES OVER 9000 PROPS I! CALL FOR IMMEDIATE SHIPMENT ON VISA OR MASTERCARD TABLE 5 6-Meter Ham Band Ai rcraft/Surface/CommuniCationS Uses 100-kHz raster Sta ABCDE 533531534532535 536537538 OLD TIMER SUPPLIES ORDER BY MAIL OR PHONE 619728-4365 SORRY NO COD VISA & MASTERCARD WELCOME DEALER INQUIRES INVITED MINIMUM MERCHANDISE ORDER $1000 SHIPPING & HANDLING FEE $150 FOR INSURANCE ADD $100 ORDERS SHIPPED WITHIN 24 HOURS S ADD 6% TAX
Edition: Model Aviation - 1988/09
Page Numbers: 26, 27, 28, 29, 30, 32, 34, 36, 37, 133
HAVE YOU BUILT small models lately answer follow ing questions yes read lighter scaled-down airplane may just what need right now have spend first hour flying field hands knees assem bling newest 60-powered wonderbird equipped tuned pipe Have ever passed over trip flying field because didnt want go trouble haul ing assembling feeding large model myself have passed up trips field no other reason down about quart glow fuel know quart fuel wont fly model long enough make trip worth right Franidy opinion large models can pain nuisance Propellers run $2 apiece break look wrong Having purchase MonoKote four rolls time Trips flying field awkward best downright uncom fortable worst disassembled cumbersome airplanes take up much room car someone must either hold engine lap hold tail keep blocking drivers line sight rearview mirror did ever notice much farther big models scatter break bigger harder fall certainly holds true flying field Larger models just have wider radius catastrophe Well ever build large models Simply because worth size weight allow fly graceflilly gently easily small models theres no remedy As rule larger models have light er wing loadings due scale effects retain good flight characteristics very high wing loadings cant argue bigger better Scale building Big engines seem easier adjust buy last longer Radios fit right want still leave plenty room other things such re tractable landing gear smoke system Big planes simply have air being serious respectable little ones Brawny appearance isnt everything though Oddly enough sophisti cated models know happen lightestthe Indoor microfilm models Al26 Model Aviation Top Although model quick large horizontal stabilizer prevents having nasty habits other little models bright colors help eyes stay locked onto small high-speed target Aside being fun main objective model hone piloting skills doing minimum Investment money aggravation Take things slowly first few flights sure keep plenty air under trying out new maneuvers S PARROW DESIGNED BY STEVE GARDNER FIBERGLASS COWL SPRUCE SffiRS IN3/3z BALSR RI5 /x FI TESTOCK ILSR STRIP rBRLSA3HEET N- BLSP SHEEJ 25 ENGINE N 7 ZDIA SPINNER 1DiA 1IL WHEEL CE &LSA HATCH 5QMAPLE LANDING GEAR BLOCK4ll j DIR MUSIC WIRE LE- Left Remove prop five sheet metal screws have easy access tne engine tuel tank battery pack engine problems really problems fuel system important have easy access fuel tank Right height firewall makes cowl 15-size engine appear short height front allows larger engines longer cowlings used looking odd Left Our author says has always preferred belicranks actuate ailerons because have least amount play system available also allow aileron servo mounted flat wing save space Right hold thin wire landing gear groove nylon straps slanted puts screw head closer wire applies pressure directly wire though dont say words devotees big models often think smaller-scale airplanes little better toys So big models imposing flying field have other virtues smaller craft offer different compensations lighter birds often very distinctive flying challenges modeler ways big ones dont Small models antidote complacency can stand taken seriously youre game piloting ship will fly smoothly unless fly smoothly reaction time up smaller airplanes unruly manners might just ready think small might just ready sacrifice prestige ease big prepossessing models ex citement knowing youve learned handie airplane competently well youre weary lugging around support gear big model little guy definitely ticket need starting battery pint fuel trans mitter youre ready go Because smaller plane will fit cars having disassembled no tools needed pint fuel will keep air four 10-minute flights smaller model will bounce larger would shatter Above said before lighter bird will keep toes Small models have characteris tic twitchiness dont want fly smooth ly nervous giddy machines al ways quick translate control input abrupt change flight path what amounts much greater con trol authority pilotextra maneuver ability motivated flier can use good advantage practice can learn orchestrate intricate maneuvers can gotten larger airplane fact can learn fly Sparrow smoothly youll able handle anything larger precision never knew Little airplanes train reflexes better fastest video games low inertia models makes possible cer tain maneuvers forbidden larger ones Sparrow will snapping maneu vers like no other airplane have ever flown can start stop snaps literally instan taneously once have required tim ing Eight-sided loops easy too corners sharp Finally smaller models easier build up certain strength Like early Grumman fighters Sparrow de signed nearly indestructible flight Although its slightest overbuilt airplane allows enter abrupt ma neuvers much higher speeds might larger model Its light weight low inertia permit rapid-fire succes sion maneuvers despite its low drag comes time slow down Spar row will lose speed rapidly rather like having built-in glide path control Larger aircraft still rule flying field smaller birds complement nicely could certainly worse build Sparrow stable models learn put want skills control authority youll de velop maneuvering airplane guar anteed carry over flying Construction standard practice build tail surfaces first sort warm-up Tail surfaces easy build too demanding theyre fairly painless way get modeling mood tail surfaces shouldnt carefully constructed rest 28 Model Aviation /4 DIA DOWEL IL SOFT BALSA BLOCK HOLLOWED WING TIPWING PLAN TOP VIEW1/L4 SPRUCE DOUOER CENTER ALL WING SHEETING1/2 ESECT IS 1/16 BALSALG BLOCKS-if -2AV~fl [v32][b-1-10-1-10]] ALL BiC BRACE III/BPLY 1/BPLYDIIEDRAL B MOUNTBRACE ___IW9W __K7 — __- W3W-2 __-U 1 0 WING DIHEDRALAILERON- 3/4 AT EACH TIPHORN1/4 BALSA SHEPTCENTER SECT COVERED I/B BALSADOWEL RETAINERWITH 2 OZ FIBERGLASS -0 Ki7[11ISUB-SPAR HINGEIz3/8 BALSA 3/16 HARD BALSALOCATIONT E STOCK FILL I/B PLY C L FORMER C 1/4 BALSA1/4 TRI SHEETSTOCK P2 Fl F-I S F2 1/16 PLY ____ACE 1/B PLY PLATE IN HATCH FOR HATCHMOUNTING SCREW 1/4 TRI W NG BO T 1F3MOUNT 1/4 TRI-STOCK CZ-. F-IR COWL IS 2 LAYERS OF 6 OZ FIBER GLASS / _____ TYPICAL HARDWOOD/1/8 HD BALSA FUSELAGE BOTTOM COWL MOUNTLBxI/4TYP HARD- WING SADDLEVIEW WOOD HATCH MOUNT BLOCKGLASS COVERED FOAM OR CLEAR COMMERCIAL CANOPY I/B MED BALSA P3FUSELAGE SIDES1/4 TRI-STOCK HO WOOD 7/BLOCK IF-4 2 DA SP NNER ______________________ I/B HO BALSA .5rzz* G SADDLE i ALL RIBS ARE ----..3/32 BALSA SHEET MEDIUM 1/B MED BALSA FUSE SIDES P4 1/4BALSA- SHEET~i STABILIZER ___-—ELEVATORHINGE TO SUIT I/4DOWEL/4 BALSA SHEET 1/8 BALSA1/B PLY GUSSETMOUNT ii7~ ~2I 1/4 BALSA SHEET ___________________IL LIGHT 1/B BALSA SI-EET BOTTOM OMITTED FOR CLARITY7I 1/4 TRI-1/x STOCK/4 BALSA SA STRIP ______/OUTLINES TRI- STOCK 7I' FINRUD \\ 1/4 BALSA SHEET TOP/ I/4BALSA VERY LIGHT 4 4 NYLONSTRIP FORMER1/B BALSA SHEET LSHARDWOODBOLTI/B BALSACROSS GRAIN PLBLOCKSUGHTSHEET BALSA1/8 DIA OS FSR 25V4UIBBLOCKMUSIC WIREFUSELAGE SIDE VIEW ENGINESPRUCELIGHT BALSA BLOCK HATCH 2 DIA WHEELSFull-Size Plans Available See Page 178 /4 BALSA SHEET 1/4 TRI 4K 1/B MED I/B PLY I/B PLY 0I2 345 6 MODEL AVIATION SPARROW DESIGNED BY STEVE GARDNER TRACING BY OE DEMARCO ALL RIGHTS RESERVED Left A dog-leg wire elevator push rod model small mistake would big 60-powered job careful make cross leg short possible sure longer sections parallel Right Control surfaces may seem too small first glance adequate conceivable maneuver keep hinge gaps small possible maximum efficiency model its just arent very hard build correctly critical step constructing airplanes tail proper choice wood gram build tail will add about five grams weight fin ished model Overbuilding will force compensate extra nose weight Worse still may try fly adding extra weight Add extra nose weight performance suffers Sidestep problem model wont fly Obviously building tail too heavy puts quandary best avoided ideal wood Sparrow tail surfacesbalsa 6- 8-lb-per-cu-ft classeliminates need add nose weight However form need balsa usually hard find Whats wanted stiff firm grade bal sa punky material feels like Styrofoam type balsa also wood choice building Hand-Launched Glider wings Free Flighters hoard like treasure mentioning possibility getting some stuff Free Flighter would probably fool hardy Dont try substitute 3A6-in balsa A-in thickness specified plans extra thickness needed lend adequate stiffness horizontal stabilizer ra tionale based having seen just about stab failures wing failures stabilizers get pounding flight theyre also subject getting hung door jambs trunk lids because promi nence Stabs built A-in balsa can stand abuse wont come apart until break off against ground As shown plans Ive made up edges fin rudder using strips grain running parallel edge purpose simply make edges easier round well help hold tail straight Since pieces A-in balsa small tend warp toO badly strips optional save having round end grain surfaces cant well enough suit stan dards use strips elevators joined either strip hardwood dowel square fiber glass cloth may folded over dowel leading edge elevator rein force joint will also strengthen area elevator horn mounted Trim cloth away slot 30 Model Aviation fuselage resist urge make slot elevator smaller Although clearance may seem excessive now can quickly become inadequate tail gets wet fuselage swells just tad situation elevator will jamand happens flight over maybe good Sand leading edges rudder elevator housetop-shaped point set hinges wood until hinge pin centerlines point housetop will allow leave very small gap hinge line MonoKote hinges may used preferred because particular geometry might necessary enlarge hole fuse lage order clear greater motion elevator joiner Fuselage Underestimating structural importance fuselage seems fairly common error among modelers Ap parently such builders assume func tion fuselage merely hold wing tail proper juxtaposition oversimplification Any part model exposed airflow has impact performance reality Continued page 32 Left If use older large radio like installation will tight impossible Using smaller servos ana u mn Dattery pack makes things easier saves weight Right Mounting aileron servo flat wing gives room between other servos ORDERS SHIPPED DAY RECEIVED WARBIRD VIDEOS VHS OR BETA OUR 23RD YEAR SPE6IA[ IWTRODO6IORY OFFER WARBIRD CHECKOUT VOL 1 Flying P-40 Warhawk Corsair Hellcat SB2-A Buccanneer Avenger NF 1325 Programs2 Hr Only $3995 ANY TWO VIDEOS ONLY $7595 ANY 3 VIDEOS ONLY $10795 AILS VIDEOS ONLY $19995 WARBIRD CHECKOUT VOL 11 Flying P-38 Mitchell Bomber P61 Black Widow Invader NF 1454 Programs100 Mm Only $3995 WARBIRD CHECKOUT VOL III Flying P-51 Mustang A-20 Bomber P-39 Introduction P-39 Advanced NF 1514 Programslb Mm Only $3995 CALL TOLL FREE IT CARDS LJ Day Night California outside USA Shipping Paid Continental USForeign add $500nts add 6 1/2% tax NF VIDEO LIBRARY 13470 WASHINGTON BLVD STE 207 MARINA DEL REY CA 90292 fuselage has much greater effect average modeler credits As fin rudder effect primarily flight direction fuse lage has exposed area fin rudder no matter what input give airplane swaybacked fuse lage will never fly straight enough suit model has crooked fuselage will fly straight speed trim will Because very tall narrow fuselage Sparrow actually functions like flight surface allowing plane perform knifeedge flight gracefully larger models its particularly important build straight mild bend fuselage sides facilitates very careful choos ing wood two sides dont have equal degree springiness fu selage almost fated come out crooked Start making up left right side wing saddle doublers spruce tank hatch strips pieces installed before sides joined intend install engine larger 19 engine have mind very hot before assembling fuse lage sides might fiberglass inside forward area say wing doubler up 6-oz glass cloth Hot Stuff isnt necessary stay engine-size limits dictated design have never yet seen model some didnt eventually subject over sized engine firewall made up two layers %-in ply Glue together installa tion later Drill hole wing dowel No 3 former have favorite method locating hole follow location specified plans exactly Slight incidence misalignments may scarcely noticed larger model will very detrimental model small Make cutouts No 4 former through pushrods extend rear model Adapt parameters cutouts shown plans suit radio necessary dont weaken area wing bolt block attaches Af ter have decided cutout patterns made sure formers configured radio glue No 3 4 formers fuselage sides Use triangle get formers square side other side glued top fu selage laid flat workbench Draw two sides together form tail very careful twists get built fuselage can traced operation Glue firewall using epoxy fast-setting glues have much improved last few years serve well purposes have better luck epoxy very high-vibration applications top block made very light A-in balsa sheet punky stuff took pains avoid building tail fine long its extremely light Dont hollow out unless unable oh32 Model AviationContinued page 34 Last An Automatic Full-Feathering Adjustable Pitch Propeller An exclusive patented 4 mechanism lets adjust pitch 8-4O optimum perfor mance blades automa tically feather when motor stops reduce drag give much Recommended 72-80 motor gliders similar models wing 4 loads up 14 ozI sq ft 05 direct e systems 1/ drive shaft Stock No MAO8XXE $2495 Suggested Retail Available Through Leading Distributors WINDSOR PROPELLER CO 384 Tesconi Ct Santa Rosa CA 95401 WARBIRD CHECKOUT VOL V Flying 8-29 Pre-Flightof BI7E Flight 8-24 NF 1553 Programsi 07 Mm Only $3995 WARBIRD CHECKOUT VOL IV Flying P-47 3 parts Flying T-6 3 parts NF 1366 Programslb MIn Only $3995 MODERN JET FIGHTER Flying F/A18 Hornet Eagle 6 F16C nnl Th4 ndohieds AC Custom Aviation Prints Original Pai Custom made photo prints ot several recent Model Builder COVER PAINTINGS Bob Benjamin now available INCLUDING Cl Prints future Model Builder COVER PAINTINGS will also available have something special mind Bob pleased discuss creating new originals custom commission basis ooorplete detale ne ordering prhits Inquire out alginat pairIngs oMI writ Robert Benjamin Aviation Art 1222 26th Ave NE Olympia WA 98506 206 352-2602 Curtiss Jenny * Quality hand-cut kit complete plans rigging scale control setup wire parts pre-bent special hardware included parts individually indentified packaged Decals Major Decal * Engine sizes 20 40 FS 25 TS * Wing unit removes four screws less 3 minutes flying wires left intact * Superb flight characteristics Introductory Price 812500 VISA erCard y Order Michigan residents add 4% sitien tax Add $550 P81 US orders $1250 foreign Video Catalog $1250 post incH VHS/Beta $5 rebate wilt roturn tapo kit ordor Reg catalog sample mini-plan *2 Hand-Cut Quality Affordable Price AERODROME MODELS LTD 2623 S Miller Rd ~__Saginaw Ml 48603 517781-3000 Othor Kits Avaiiabie Aero-Pacer Saby -Pacer Gipsy Moth Rybaby Fiybaby combo Hawkor Hurricane Jester tam wood thats sufficiently light because should have enough mass give stiffness fuselage Glue top block onto fuselage add triangle stock can see plans goes almost everywhere Make tail wheel strut /16 music wire Sew little ply former stall rear fuselage lack steerable tail wheel bothers theres no reason add using favorite method doesnt seem necessary model Add strip balsa uprights crosspieces rear fuselage well wing bolt block its triangle rein forcements Sheet bottom assem bly grain running crosswise Make hatch balsa block small plywood squares inserted inner face Attach wood screws small hardwood blocks added inside nose helps control vibration front model allowing hatch take some structural load nose prototype used two points tachment diagonal corners hatch using four plywood squares works much better easy access fuel tank isnt important youre planning stall engine larger recommended 19 size can skip foregoing just glue hatch place Personally like maintainability separate tank hatch Slot top block fin Doing after fuselage assembled ensures accu rate alignment completed fuselage shaped rounding top block hatch chose round off sharp corners behind wing prototype can wish adding triangle stock canopy Sparrow must very narrow fit properly can find ready-made fills bill means use Being unable find canopy narrow enough used Styrofoam custom make prototype After shaping foam suit give coat 2-oz glass cloth epoxy resin Paint prime canopy match model Since canopy factor determining size fin rudder would unwise 34 Model Aviation include model airplanes knife-edge capabilities might diminished model would behave needed dihedral Wing builder encounters biggest challenge Generally wing hardest part model build right other part model want wing warp-free yet its difficult part build warps want honest-flying Sparrow its wing must straight Ensure its straight warp-free before cover once webbing place wing will twist great extent wing area small old trick straightening wing MonoKote will work very poorly Dont rely Make spar carefully selected straight-grained spruce Using very straight-grained wood protects model coming apart air no matter much beating its given Test sam ple seeing can follow grain layer least 10 find piece straighter grain spar joined unusual manner Two strips spruce scraps left over making spars used double joint between spars center wing installed between top bottom caps just like splints 3A6-in ply plate shaped conform wing spar sweep epoxied place after wing joined wing dowel should glued place before wing sheeted ensure strong bond center ribs A-in balsa pieces side wing no stronger joint very certain its accu racy double-check wing straight before web spar webbing should installed very carefully under great deal strain modelers realize dont want have gaps would need filled glue webbing should run along straight vertical best effect Nothing else gives much strength small weight increase does proper web bing prototype I built up ailerons Continued page 36 ct OO J Power W Products Inc Only certified checks money orders accepted Minimum Order glom three packages 4 Pumerpoles $3 per package $t shipping huodhogi CT residents add 70% sales tao Prices nubiect ohange nofice DEALER INQUIRIES INVITED further information dealer paces send SASE Business Card SERMOS RIC SNAP CONNECTORS~ Celar Canes Si 8ox 16787 Stantad CI 069C203322-6294 pieces trailing edge sheeting cut out make aileron wells could over again would simply make solid balsa have indicated plans weight sav ings turned out almost nonexistent construction much timeconsuming making solid ailerons would have recommend using bellcranks because re careful about rig offer least amount play system wing can accommodate Id think twice about substituting something else airplane needs ailerons center time let go stick little stiffness acceptable Once sheeting place cover center joint 6-oz glass cloth ep oxy resin Hot Stuff cutout servo wing sheeting easier make before center section covered glass wing faired fuselage very light balsa block glued top glass wing block bolts should set fairing until bear wing self used 10-32 nylon bolts proto type because ability break away before wing block does However since nylon bolts difficult find some areas can substitute regular A-20 bolts necessary Assembly Bolt wing place true horizontal stabilizer eye much easier sounds Holding model up nose pointed towards change angle model until stab makes line just above top surface wing Adjust stab until paral lel wing measure top center firewall tips stab get proper alignment indicated plan view fin simply fitted slot top block its alignment will no bet ter slot Use triangle get fin square stab such small model misalignments will have magni fied effect exacting can dur ing assembly cowling built up same way canopy its bit difficult make fit perfectly engine its mount mount model tack glue foam blocks around engine up back spinner Mark foam front locate spinner circle Gently remove foam take engine mount off model preserve location spinner circle tack foam back onto model exactly broke off Glue front cowl former onto foam Carve sand foam shape prefer try fancier shape prototype keep lines simple will look odd Remove cowl form model cut off about / out side edge foam back cowl allow thickness fiberglass 36 Model Aviation SNAP POINT KNIFE SAMPLE Blade Included Send $125 Stamps 5/25s please Write Complete Price List Berkeley Trading Co PO Box 26- Dept HB Berkeley Springs WV 25411 258-2 773 THE FOX 50 HERE Light enough 40 size airplanes Powerful enough 60 size airplanes * * * * often have wished little power 40 size model couldnt see potting big heavy 60 up front 11A oz bare Fox 50 fills need energetic user friendly Fox 45 has stretched give extra torque necessary handle 11 prop authority retains its user friendly nature technically minded some pertinent data Bore Stroke Schneurle ported double ball bearing course The crankshaft machined piece SAE 86L20 steel surface hardened tempered crankpin ground before heat treat retain its hard skin The piston cast low expansion 390 alloy fitted free floating piston ring made patented process The 7/32 dia tubular wrist pin retained unique rollpin retaining system results considerable increase bearing area corresponding increase life cylinder hardened steel carefully tapered crossbotched bore sturdy connecting rod machined high strength aluminum bar fitted bronze bushing both ends The cylinder head uses two piece button design results accurate combustion chamber piece casting also has much stronger glow plug thread The crankcase pressure cast 384 alloy considerably stronger alloys manufacturers use Also design utilizes patented high back door feature resists compression stresses better conventional design BUY AND FLY ONE YOU WILL BE HAPPY WITH IT Fox motor test run factory checked idle full power throttla response compression Only motors meet performance standardr sold Most competitors reluctant spend time money check run motors risk spoiling exterior appearance thinli important motors run well finest motor world no good part broken cant get another Fox owners can get part promptly calling 501-646-1656 giving us motot size part name number Visa Mastercard number Duke Fox has building model airplane motors USA since 1943 Labor 100% American material except ball bearings Americar made MANUFACTURING 5305 TOWSON AVENUE FORT SMITH AR 72901 - - _________ PHONE 501 6461656 About three layers 2-oz glass cloth epoxy gives right combination light ness strength cowling will never crack vibration Unlike procedure making can opy foam must melted out cowling make room engine used dope thinner However thinner can cause severe discomfort fire hazard boot Use out doors extreme care An alternative method dig foam out knife cowling mounted small hard wood blocks glued firewall about % edge Use blocks desired long keep out way controls lines engine Very small countersunk wood screws used hold cowling place front former cowling can cut out clear throttle arm Dont cut away too much will rattle run engine Covering finishing MonoKote used prototypeorange fuse lage tail transparent red wings color scheme up sure make easy see small fast model flying away will quickly shrink dot ether want stand out vividly possible Covering model after assembly rather before little trou ble eliminates worry MonoKote between various pieces could interfere glue joints cowling can painted match MonoKote can prime fiberglass Ambroid cement MonoKote cowling fact though its obsolete general model building pur poses Ambroid will wonders making MonoKote stick epoxy firewalls wing center sections Radio engine Radio installation Sparrow tight managed fit old Tower Hobby System 4 radio mon ster servos full-size battery pack smaller radio will give better perform ance easier time installa tion Use battery position balance model can strongly recommend pushrods made wood Nyrod pushrods change length dif ferent temperatures small model can make unacceptable trim changes Dont use servo tape install flight control servos first time around installed Enya 15 plain bearing engine prototype provided enough power liftoff about 40 ft flight 50 mph range pulled vertical model quickly slowed down piloted smoothly airplane would vertical figure eight bigger engine clearly called improve vertical performance Replacing 15 Fox 25 plain bearing engine made difference hoped Upon command model would Continued page 133 s old timer perfeCtly pmportioned modeling Curtiss Robin 049 EngInes -Channel RIC 41 WIngspan ElectrIc Power Optional 82296 00 e03 Very tee lull scale aircraft ideally suited model olast s appealing aid curtiss Robin born spruce linen age beaatifally proportioned rubber electric glow engines Easy fan build trainerlike pertormanca Flyline Models Catalog 505 P5ono 17031 273-0503 FLYLINE MODELS INC PO Sos 2136 Palrtax VirgInia 22031 USA September 1988 37 ONLY 129Y5 INCLUDING SPINNER AND TILT DOWN MUFFLER ITEM NO 25000 Some things should consider comparing Fox 50 other brands ROCKET PLANE xP-1 Valley View Dr Box 43 716 372-8406Allegany NY 14706 Sparrow/Gardner Continued page 37 now dart straight up almost out sight happen have hot 15 20 will fine Please resist urge put 40 model Youd have rebalance airplane point would scarcely flyable unless engine three-quarters full throttle over burdened model would also very hard land Flying Careful trimming will help get out Sparrow Start about 3A5 aileron throw % ele vator throw 1 rudder throw Bal ance model point about % in front center-of-gravity plans Fly way several flights before change anything Quick isnt youll get used after few flights Once feel comfortable model can wring out bit begin get timing right move balance point back indi cated plans will make mod el little quicker yet will also release its snapping spinning potential Snapping maneuvers Sparrows strongest suit airplane will perform two full inside outside vertical snaps still heading straight up afterwards can partial snaps precision Granted intricate tricks like gliding three quarters outside snap knife-edge flight hard learn airplane happy doing Once have sharp ened timing youll find possi bilities almost limifless youre quick enough stirring sticks chances Sparrow will almost ma neuver days hauling flying larger model doesnt seem worth trouble model like Sparrow can really help keep edge Fly singular things alone can model isnt taken seriously least right off bat improvement flying skills definitely will Radio Technique/Myers Continued page 39 Hams required listen before transmit tends limit RE interference no guarantees Any quiet spot band can used Ham operator Charging ahead used Pacific Plan dis tribute Ham-band RC0O-09 channels shown Table 4 because 20-kHz raster because expect cur rent users can obtain Gold Sticker performance Hams should get together group insist moving everything Gold Sticker soon possible tainly 1991 AMA permits even-numbered chan nels sanctioned events Hams lib erty use 10 right now park makes Gold Sticker performance neces sary safe operation 53 MHz six-meter distribution Table 5 per Pacific Plan may neces sary due 100 kHz raster Replacing transmitter batteries times have noticed transmitter out put meter reads lower usual and/or operating time shorter used common problem cell bat tery pack has developed short circuit transmitter still under warranty probably send back manufacturer wait may out warranty and/or dont want wait Decision time find replace bad cell re place whole pack order make decision must re move pack transmitter Step disconnect pack mistakes can make working electronic circuit least forgivable damage components cause too lazy disconnect power supply momentary short circuit wrong place can destroy transmitters electronics So unplug battery pack can cut both wires cant simple matter put Deans connectors 19K54 $155 Ace RIC Inc Box 511E Higginsville MO 64037 cut ends wire want reassemble transmit ter Match wire colors install Deans connectors making sure male plug side transmitter pull pins out isolated contact provide means quick visual check connecting battery pack polarity reversed matter polarity Practically everyone uses Red k y Sribnick told particular case PCM trans mitters Futaha JR Red wire charger k wire meter necessary tool working batteriesand dont assume anything Now have pack hand put number cell using pen paper stick ers attach 20-ohm 10-watt resistor pack monitor voltage cell pack discharging Write down voltages cell five-minute intervals Keep discharg ing pack until cell reads 0 VDC Leave resistor connected wont hurt anything Looking list voltages will tell cells shorted start 0 VDC whether pack balanced cells get 0 VDC about same moment unbalanced dont pack unbalanced remove resistor charge pack overnight re peat test pack still unbalanced suggestion junk because another cell probably going fail Ace R/C sells kinds Ni-Cds probably can supply what needContinued page 134 SPECIALISTS IN CUSTOM COX TEE DEE & REED ENGINES 020S 049 051S & 09S ALL CUSTOM & STOCK PARTS AVAILABLE INDIVIDUALLY MANY NEW PARTS FOR OLD DISCONTINUED COX ENGINES COX PROPS & GLOW HEADS COMPETITION ACCESSORIES & CUSTOMIZED K&B ENGINES ALSO COMPLETE LINE OF RACING PARTS - GLO-BEE FIREBALL & K&B PLUGS SOLID LINES RACING WHEELS QUICK FILLS ETC WE ALSO STOCK CARBON FIBER KLOTZ OIL LATEX & SILICONE FUEL TUBING PEN BLADDER MATERIALS & HARDTO-FIND HARDWARE ESPECIALLY 2-56 & 3-48 SIZES COILS CONDENSERS NGK & STIlT PLUGS SILK 12 COLORS QUALITY DOPE BRUSHES 5 & 7 LOOP RUBBER BANDS KSB SEELIG & IGNITION TIMERS GAS & DIESEL FUEL TUBING TRANSISTOR IGNITION SYSTEMS RESISTOR HI-TENSION LEADS 1/2A TEXACO PLAYBOY SR KIT 1/2A TEXACO ENGINES & PARTS EVERYTHING YOU NEED FOR OLD TIMER EVENTS September 1988 133 TABLE 4 50 MHz Ham Band AircraftlSurfacelOommunications Uses ARRL band plan recognizes assignment RC StalionABCDE 20-kHz raster0003010402 0705080609 OUR REV-UP INVENTORY AVERAGES OVER 9000 PROPS I! CALL FOR IMMEDIATE SHIPMENT ON VISA OR MASTERCARD TABLE 5 6-Meter Ham Band Ai rcraft/Surface/CommuniCationS Uses 100-kHz raster Sta ABCDE 533531534532535 536537538 OLD TIMER SUPPLIES ORDER BY MAIL OR PHONE 619728-4365 SORRY NO COD VISA & MASTERCARD WELCOME DEALER INQUIRES INVITED MINIMUM MERCHANDISE ORDER $1000 SHIPPING & HANDLING FEE $150 FOR INSURANCE ADD $100 ORDERS SHIPPED WITHIN 24 HOURS S ADD 6% TAX
Edition: Model Aviation - 1988/09
Page Numbers: 26, 27, 28, 29, 30, 32, 34, 36, 37, 133
HAVE YOU BUILT small models lately answer follow ing questions yes read lighter scaled-down airplane may just what need right now have spend first hour flying field hands knees assem bling newest 60-powered wonderbird equipped tuned pipe Have ever passed over trip flying field because didnt want go trouble haul ing assembling feeding large model myself have passed up trips field no other reason down about quart glow fuel know quart fuel wont fly model long enough make trip worth right Franidy opinion large models can pain nuisance Propellers run $2 apiece break look wrong Having purchase MonoKote four rolls time Trips flying field awkward best downright uncom fortable worst disassembled cumbersome airplanes take up much room car someone must either hold engine lap hold tail keep blocking drivers line sight rearview mirror did ever notice much farther big models scatter break bigger harder fall certainly holds true flying field Larger models just have wider radius catastrophe Well ever build large models Simply because worth size weight allow fly graceflilly gently easily small models theres no remedy As rule larger models have light er wing loadings due scale effects retain good flight characteristics very high wing loadings cant argue bigger better Scale building Big engines seem easier adjust buy last longer Radios fit right want still leave plenty room other things such re tractable landing gear smoke system Big planes simply have air being serious respectable little ones Brawny appearance isnt everything though Oddly enough sophisti cated models know happen lightestthe Indoor microfilm models Al26 Model Aviation Top Although model quick large horizontal stabilizer prevents having nasty habits other little models bright colors help eyes stay locked onto small high-speed target Aside being fun main objective model hone piloting skills doing minimum Investment money aggravation Take things slowly first few flights sure keep plenty air under trying out new maneuvers S PARROW DESIGNED BY STEVE GARDNER FIBERGLASS COWL SPRUCE SffiRS IN3/3z BALSR RI5 /x FI TESTOCK ILSR STRIP rBRLSA3HEET N- BLSP SHEEJ 25 ENGINE N 7 ZDIA SPINNER 1DiA 1IL WHEEL CE &LSA HATCH 5QMAPLE LANDING GEAR BLOCK4ll j DIR MUSIC WIRE LE- Left Remove prop five sheet metal screws have easy access tne engine tuel tank battery pack engine problems really problems fuel system important have easy access fuel tank Right height firewall makes cowl 15-size engine appear short height front allows larger engines longer cowlings used looking odd Left Our author says has always preferred belicranks actuate ailerons because have least amount play system available also allow aileron servo mounted flat wing save space Right hold thin wire landing gear groove nylon straps slanted puts screw head closer wire applies pressure directly wire though dont say words devotees big models often think smaller-scale airplanes little better toys So big models imposing flying field have other virtues smaller craft offer different compensations lighter birds often very distinctive flying challenges modeler ways big ones dont Small models antidote complacency can stand taken seriously youre game piloting ship will fly smoothly unless fly smoothly reaction time up smaller airplanes unruly manners might just ready think small might just ready sacrifice prestige ease big prepossessing models ex citement knowing youve learned handie airplane competently well youre weary lugging around support gear big model little guy definitely ticket need starting battery pint fuel trans mitter youre ready go Because smaller plane will fit cars having disassembled no tools needed pint fuel will keep air four 10-minute flights smaller model will bounce larger would shatter Above said before lighter bird will keep toes Small models have characteris tic twitchiness dont want fly smooth ly nervous giddy machines al ways quick translate control input abrupt change flight path what amounts much greater con trol authority pilotextra maneuver ability motivated flier can use good advantage practice can learn orchestrate intricate maneuvers can gotten larger airplane fact can learn fly Sparrow smoothly youll able handle anything larger precision never knew Little airplanes train reflexes better fastest video games low inertia models makes possible cer tain maneuvers forbidden larger ones Sparrow will snapping maneu vers like no other airplane have ever flown can start stop snaps literally instan taneously once have required tim ing Eight-sided loops easy too corners sharp Finally smaller models easier build up certain strength Like early Grumman fighters Sparrow de signed nearly indestructible flight Although its slightest overbuilt airplane allows enter abrupt ma neuvers much higher speeds might larger model Its light weight low inertia permit rapid-fire succes sion maneuvers despite its low drag comes time slow down Spar row will lose speed rapidly rather like having built-in glide path control Larger aircraft still rule flying field smaller birds complement nicely could certainly worse build Sparrow stable models learn put want skills control authority youll de velop maneuvering airplane guar anteed carry over flying Construction standard practice build tail surfaces first sort warm-up Tail surfaces easy build too demanding theyre fairly painless way get modeling mood tail surfaces shouldnt carefully constructed rest 28 Model Aviation /4 DIA DOWEL IL SOFT BALSA BLOCK HOLLOWED WING TIPWING PLAN TOP VIEW1/L4 SPRUCE DOUOER CENTER ALL WING SHEETING1/2 ESECT IS 1/16 BALSALG BLOCKS-if -2AV~fl [v32][b-1-10-1-10]] ALL BiC BRACE III/BPLY 1/BPLYDIIEDRAL B MOUNTBRACE ___IW9W __K7 — __- W3W-2 __-U 1 0 WING DIHEDRALAILERON- 3/4 AT EACH TIPHORN1/4 BALSA SHEPTCENTER SECT COVERED I/B BALSADOWEL RETAINERWITH 2 OZ FIBERGLASS -0 Ki7[11ISUB-SPAR HINGEIz3/8 BALSA 3/16 HARD BALSALOCATIONT E STOCK FILL I/B PLY C L FORMER C 1/4 BALSA1/4 TRI SHEETSTOCK P2 Fl F-I S F2 1/16 PLY ____ACE 1/B PLY PLATE IN HATCH FOR HATCHMOUNTING SCREW 1/4 TRI W NG BO T 1F3MOUNT 1/4 TRI-STOCK CZ-. F-IR COWL IS 2 LAYERS OF 6 OZ FIBER GLASS / _____ TYPICAL HARDWOOD/1/8 HD BALSA FUSELAGE BOTTOM COWL MOUNTLBxI/4TYP HARD- WING SADDLEVIEW WOOD HATCH MOUNT BLOCKGLASS COVERED FOAM OR CLEAR COMMERCIAL CANOPY I/B MED BALSA P3FUSELAGE SIDES1/4 TRI-STOCK HO WOOD 7/BLOCK IF-4 2 DA SP NNER ______________________ I/B HO BALSA .5rzz* G SADDLE i ALL RIBS ARE ----..3/32 BALSA SHEET MEDIUM 1/B MED BALSA FUSE SIDES P4 1/4BALSA- SHEET~i STABILIZER ___-—ELEVATORHINGE TO SUIT I/4DOWEL/4 BALSA SHEET 1/8 BALSA1/B PLY GUSSETMOUNT ii7~ ~2I 1/4 BALSA SHEET ___________________IL LIGHT 1/B BALSA SI-EET BOTTOM OMITTED FOR CLARITY7I 1/4 TRI-1/x STOCK/4 BALSA SA STRIP ______/OUTLINES TRI- STOCK 7I' FINRUD \\ 1/4 BALSA SHEET TOP/ I/4BALSA VERY LIGHT 4 4 NYLONSTRIP FORMER1/B BALSA SHEET LSHARDWOODBOLTI/B BALSACROSS GRAIN PLBLOCKSUGHTSHEET BALSA1/8 DIA OS FSR 25V4UIBBLOCKMUSIC WIREFUSELAGE SIDE VIEW ENGINESPRUCELIGHT BALSA BLOCK HATCH 2 DIA WHEELSFull-Size Plans Available See Page 178 /4 BALSA SHEET 1/4 TRI 4K 1/B MED I/B PLY I/B PLY 0I2 345 6 MODEL AVIATION SPARROW DESIGNED BY STEVE GARDNER TRACING BY OE DEMARCO ALL RIGHTS RESERVED Left A dog-leg wire elevator push rod model small mistake would big 60-powered job careful make cross leg short possible sure longer sections parallel Right Control surfaces may seem too small first glance adequate conceivable maneuver keep hinge gaps small possible maximum efficiency model its just arent very hard build correctly critical step constructing airplanes tail proper choice wood gram build tail will add about five grams weight fin ished model Overbuilding will force compensate extra nose weight Worse still may try fly adding extra weight Add extra nose weight performance suffers Sidestep problem model wont fly Obviously building tail too heavy puts quandary best avoided ideal wood Sparrow tail surfacesbalsa 6- 8-lb-per-cu-ft classeliminates need add nose weight However form need balsa usually hard find Whats wanted stiff firm grade bal sa punky material feels like Styrofoam type balsa also wood choice building Hand-Launched Glider wings Free Flighters hoard like treasure mentioning possibility getting some stuff Free Flighter would probably fool hardy Dont try substitute 3A6-in balsa A-in thickness specified plans extra thickness needed lend adequate stiffness horizontal stabilizer ra tionale based having seen just about stab failures wing failures stabilizers get pounding flight theyre also subject getting hung door jambs trunk lids because promi nence Stabs built A-in balsa can stand abuse wont come apart until break off against ground As shown plans Ive made up edges fin rudder using strips grain running parallel edge purpose simply make edges easier round well help hold tail straight Since pieces A-in balsa small tend warp toO badly strips optional save having round end grain surfaces cant well enough suit stan dards use strips elevators joined either strip hardwood dowel square fiber glass cloth may folded over dowel leading edge elevator rein force joint will also strengthen area elevator horn mounted Trim cloth away slot 30 Model Aviation fuselage resist urge make slot elevator smaller Although clearance may seem excessive now can quickly become inadequate tail gets wet fuselage swells just tad situation elevator will jamand happens flight over maybe good Sand leading edges rudder elevator housetop-shaped point set hinges wood until hinge pin centerlines point housetop will allow leave very small gap hinge line MonoKote hinges may used preferred because particular geometry might necessary enlarge hole fuse lage order clear greater motion elevator joiner Fuselage Underestimating structural importance fuselage seems fairly common error among modelers Ap parently such builders assume func tion fuselage merely hold wing tail proper juxtaposition oversimplification Any part model exposed airflow has impact performance reality Continued page 32 Left If use older large radio like installation will tight impossible Using smaller servos ana u mn Dattery pack makes things easier saves weight Right Mounting aileron servo flat wing gives room between other servos ORDERS SHIPPED DAY RECEIVED WARBIRD VIDEOS VHS OR BETA OUR 23RD YEAR SPE6IA[ IWTRODO6IORY OFFER WARBIRD CHECKOUT VOL 1 Flying P-40 Warhawk Corsair Hellcat SB2-A Buccanneer Avenger NF 1325 Programs2 Hr Only $3995 ANY TWO VIDEOS ONLY $7595 ANY 3 VIDEOS ONLY $10795 AILS VIDEOS ONLY $19995 WARBIRD CHECKOUT VOL 11 Flying P-38 Mitchell Bomber P61 Black Widow Invader NF 1454 Programs100 Mm Only $3995 WARBIRD CHECKOUT VOL III Flying P-51 Mustang A-20 Bomber P-39 Introduction P-39 Advanced NF 1514 Programslb Mm Only $3995 CALL TOLL FREE IT CARDS LJ Day Night California outside USA Shipping Paid Continental USForeign add $500nts add 6 1/2% tax NF VIDEO LIBRARY 13470 WASHINGTON BLVD STE 207 MARINA DEL REY CA 90292 fuselage has much greater effect average modeler credits As fin rudder effect primarily flight direction fuse lage has exposed area fin rudder no matter what input give airplane swaybacked fuse lage will never fly straight enough suit model has crooked fuselage will fly straight speed trim will Because very tall narrow fuselage Sparrow actually functions like flight surface allowing plane perform knifeedge flight gracefully larger models its particularly important build straight mild bend fuselage sides facilitates very careful choos ing wood two sides dont have equal degree springiness fu selage almost fated come out crooked Start making up left right side wing saddle doublers spruce tank hatch strips pieces installed before sides joined intend install engine larger 19 engine have mind very hot before assembling fuse lage sides might fiberglass inside forward area say wing doubler up 6-oz glass cloth Hot Stuff isnt necessary stay engine-size limits dictated design have never yet seen model some didnt eventually subject over sized engine firewall made up two layers %-in ply Glue together installa tion later Drill hole wing dowel No 3 former have favorite method locating hole follow location specified plans exactly Slight incidence misalignments may scarcely noticed larger model will very detrimental model small Make cutouts No 4 former through pushrods extend rear model Adapt parameters cutouts shown plans suit radio necessary dont weaken area wing bolt block attaches Af ter have decided cutout patterns made sure formers configured radio glue No 3 4 formers fuselage sides Use triangle get formers square side other side glued top fu selage laid flat workbench Draw two sides together form tail very careful twists get built fuselage can traced operation Glue firewall using epoxy fast-setting glues have much improved last few years serve well purposes have better luck epoxy very high-vibration applications top block made very light A-in balsa sheet punky stuff took pains avoid building tail fine long its extremely light Dont hollow out unless unable oh32 Model AviationContinued page 34 Last An Automatic Full-Feathering Adjustable Pitch Propeller An exclusive patented 4 mechanism lets adjust pitch 8-4O optimum perfor mance blades automa tically feather when motor stops reduce drag give much Recommended 72-80 motor gliders similar models wing 4 loads up 14 ozI sq ft 05 direct e systems 1/ drive shaft Stock No MAO8XXE $2495 Suggested Retail Available Through Leading Distributors WINDSOR PROPELLER CO 384 Tesconi Ct Santa Rosa CA 95401 WARBIRD CHECKOUT VOL V Flying 8-29 Pre-Flightof BI7E Flight 8-24 NF 1553 Programsi 07 Mm Only $3995 WARBIRD CHECKOUT VOL IV Flying P-47 3 parts Flying T-6 3 parts NF 1366 Programslb MIn Only $3995 MODERN JET FIGHTER Flying F/A18 Hornet Eagle 6 F16C nnl Th4 ndohieds AC Custom Aviation Prints Original Pai Custom made photo prints ot several recent Model Builder COVER PAINTINGS Bob Benjamin now available INCLUDING Cl Prints future Model Builder COVER PAINTINGS will also available have something special mind Bob pleased discuss creating new originals custom commission basis ooorplete detale ne ordering prhits Inquire out alginat pairIngs oMI writ Robert Benjamin Aviation Art 1222 26th Ave NE Olympia WA 98506 206 352-2602 Curtiss Jenny * Quality hand-cut kit complete plans rigging scale control setup wire parts pre-bent special hardware included parts individually indentified packaged Decals Major Decal * Engine sizes 20 40 FS 25 TS * Wing unit removes four screws less 3 minutes flying wires left intact * Superb flight characteristics Introductory Price 812500 VISA erCard y Order Michigan residents add 4% sitien tax Add $550 P81 US orders $1250 foreign Video Catalog $1250 post incH VHS/Beta $5 rebate wilt roturn tapo kit ordor Reg catalog sample mini-plan *2 Hand-Cut Quality Affordable Price AERODROME MODELS LTD 2623 S Miller Rd ~__Saginaw Ml 48603 517781-3000 Othor Kits Avaiiabie Aero-Pacer Saby -Pacer Gipsy Moth Rybaby Fiybaby combo Hawkor Hurricane Jester tam wood thats sufficiently light because should have enough mass give stiffness fuselage Glue top block onto fuselage add triangle stock can see plans goes almost everywhere Make tail wheel strut /16 music wire Sew little ply former stall rear fuselage lack steerable tail wheel bothers theres no reason add using favorite method doesnt seem necessary model Add strip balsa uprights crosspieces rear fuselage well wing bolt block its triangle rein forcements Sheet bottom assem bly grain running crosswise Make hatch balsa block small plywood squares inserted inner face Attach wood screws small hardwood blocks added inside nose helps control vibration front model allowing hatch take some structural load nose prototype used two points tachment diagonal corners hatch using four plywood squares works much better easy access fuel tank isnt important youre planning stall engine larger recommended 19 size can skip foregoing just glue hatch place Personally like maintainability separate tank hatch Slot top block fin Doing after fuselage assembled ensures accu rate alignment completed fuselage shaped rounding top block hatch chose round off sharp corners behind wing prototype can wish adding triangle stock canopy Sparrow must very narrow fit properly can find ready-made fills bill means use Being unable find canopy narrow enough used Styrofoam custom make prototype After shaping foam suit give coat 2-oz glass cloth epoxy resin Paint prime canopy match model Since canopy factor determining size fin rudder would unwise 34 Model Aviation include model airplanes knife-edge capabilities might diminished model would behave needed dihedral Wing builder encounters biggest challenge Generally wing hardest part model build right other part model want wing warp-free yet its difficult part build warps want honest-flying Sparrow its wing must straight Ensure its straight warp-free before cover once webbing place wing will twist great extent wing area small old trick straightening wing MonoKote will work very poorly Dont rely Make spar carefully selected straight-grained spruce Using very straight-grained wood protects model coming apart air no matter much beating its given Test sam ple seeing can follow grain layer least 10 find piece straighter grain spar joined unusual manner Two strips spruce scraps left over making spars used double joint between spars center wing installed between top bottom caps just like splints 3A6-in ply plate shaped conform wing spar sweep epoxied place after wing joined wing dowel should glued place before wing sheeted ensure strong bond center ribs A-in balsa pieces side wing no stronger joint very certain its accu racy double-check wing straight before web spar webbing should installed very carefully under great deal strain modelers realize dont want have gaps would need filled glue webbing should run along straight vertical best effect Nothing else gives much strength small weight increase does proper web bing prototype I built up ailerons Continued page 36 ct OO J Power W Products Inc Only certified checks money orders accepted Minimum Order glom three packages 4 Pumerpoles $3 per package $t shipping huodhogi CT residents add 70% sales tao Prices nubiect ohange nofice DEALER INQUIRIES INVITED further information dealer paces send SASE Business Card SERMOS RIC SNAP CONNECTORS~ Celar Canes Si 8ox 16787 Stantad CI 069C203322-6294 pieces trailing edge sheeting cut out make aileron wells could over again would simply make solid balsa have indicated plans weight sav ings turned out almost nonexistent construction much timeconsuming making solid ailerons would have recommend using bellcranks because re careful about rig offer least amount play system wing can accommodate Id think twice about substituting something else airplane needs ailerons center time let go stick little stiffness acceptable Once sheeting place cover center joint 6-oz glass cloth ep oxy resin Hot Stuff cutout servo wing sheeting easier make before center section covered glass wing faired fuselage very light balsa block glued top glass wing block bolts should set fairing until bear wing self used 10-32 nylon bolts proto type because ability break away before wing block does However since nylon bolts difficult find some areas can substitute regular A-20 bolts necessary Assembly Bolt wing place true horizontal stabilizer eye much easier sounds Holding model up nose pointed towards change angle model until stab makes line just above top surface wing Adjust stab until paral lel wing measure top center firewall tips stab get proper alignment indicated plan view fin simply fitted slot top block its alignment will no bet ter slot Use triangle get fin square stab such small model misalignments will have magni fied effect exacting can dur ing assembly cowling built up same way canopy its bit difficult make fit perfectly engine its mount mount model tack glue foam blocks around engine up back spinner Mark foam front locate spinner circle Gently remove foam take engine mount off model preserve location spinner circle tack foam back onto model exactly broke off Glue front cowl former onto foam Carve sand foam shape prefer try fancier shape prototype keep lines simple will look odd Remove cowl form model cut off about / out side edge foam back cowl allow thickness fiberglass 36 Model Aviation SNAP POINT KNIFE SAMPLE Blade Included Send $125 Stamps 5/25s please Write Complete Price List Berkeley Trading Co PO Box 26- Dept HB Berkeley Springs WV 25411 258-2 773 THE FOX 50 HERE Light enough 40 size airplanes Powerful enough 60 size airplanes * * * * often have wished little power 40 size model couldnt see potting big heavy 60 up front 11A oz bare Fox 50 fills need energetic user friendly Fox 45 has stretched give extra torque necessary handle 11 prop authority retains its user friendly nature technically minded some pertinent data Bore Stroke Schneurle ported double ball bearing course The crankshaft machined piece SAE 86L20 steel surface hardened tempered crankpin ground before heat treat retain its hard skin The piston cast low expansion 390 alloy fitted free floating piston ring made patented process The 7/32 dia tubular wrist pin retained unique rollpin retaining system results considerable increase bearing area corresponding increase life cylinder hardened steel carefully tapered crossbotched bore sturdy connecting rod machined high strength aluminum bar fitted bronze bushing both ends The cylinder head uses two piece button design results accurate combustion chamber piece casting also has much stronger glow plug thread The crankcase pressure cast 384 alloy considerably stronger alloys manufacturers use Also design utilizes patented high back door feature resists compression stresses better conventional design BUY AND FLY ONE YOU WILL BE HAPPY WITH IT Fox motor test run factory checked idle full power throttla response compression Only motors meet performance standardr sold Most competitors reluctant spend time money check run motors risk spoiling exterior appearance thinli important motors run well finest motor world no good part broken cant get another Fox owners can get part promptly calling 501-646-1656 giving us motot size part name number Visa Mastercard number Duke Fox has building model airplane motors USA since 1943 Labor 100% American material except ball bearings Americar made MANUFACTURING 5305 TOWSON AVENUE FORT SMITH AR 72901 - - _________ PHONE 501 6461656 About three layers 2-oz glass cloth epoxy gives right combination light ness strength cowling will never crack vibration Unlike procedure making can opy foam must melted out cowling make room engine used dope thinner However thinner can cause severe discomfort fire hazard boot Use out doors extreme care An alternative method dig foam out knife cowling mounted small hard wood blocks glued firewall about % edge Use blocks desired long keep out way controls lines engine Very small countersunk wood screws used hold cowling place front former cowling can cut out clear throttle arm Dont cut away too much will rattle run engine Covering finishing MonoKote used prototypeorange fuse lage tail transparent red wings color scheme up sure make easy see small fast model flying away will quickly shrink dot ether want stand out vividly possible Covering model after assembly rather before little trou ble eliminates worry MonoKote between various pieces could interfere glue joints cowling can painted match MonoKote can prime fiberglass Ambroid cement MonoKote cowling fact though its obsolete general model building pur poses Ambroid will wonders making MonoKote stick epoxy firewalls wing center sections Radio engine Radio installation Sparrow tight managed fit old Tower Hobby System 4 radio mon ster servos full-size battery pack smaller radio will give better perform ance easier time installa tion Use battery position balance model can strongly recommend pushrods made wood Nyrod pushrods change length dif ferent temperatures small model can make unacceptable trim changes Dont use servo tape install flight control servos first time around installed Enya 15 plain bearing engine prototype provided enough power liftoff about 40 ft flight 50 mph range pulled vertical model quickly slowed down piloted smoothly airplane would vertical figure eight bigger engine clearly called improve vertical performance Replacing 15 Fox 25 plain bearing engine made difference hoped Upon command model would Continued page 133 s old timer perfeCtly pmportioned modeling Curtiss Robin 049 EngInes -Channel RIC 41 WIngspan ElectrIc Power Optional 82296 00 e03 Very tee lull scale aircraft ideally suited model olast s appealing aid curtiss Robin born spruce linen age beaatifally proportioned rubber electric glow engines Easy fan build trainerlike pertormanca Flyline Models Catalog 505 P5ono 17031 273-0503 FLYLINE MODELS INC PO Sos 2136 Palrtax VirgInia 22031 USA September 1988 37 ONLY 129Y5 INCLUDING SPINNER AND TILT DOWN MUFFLER ITEM NO 25000 Some things should consider comparing Fox 50 other brands ROCKET PLANE xP-1 Valley View Dr Box 43 716 372-8406Allegany NY 14706 Sparrow/Gardner Continued page 37 now dart straight up almost out sight happen have hot 15 20 will fine Please resist urge put 40 model Youd have rebalance airplane point would scarcely flyable unless engine three-quarters full throttle over burdened model would also very hard land Flying Careful trimming will help get out Sparrow Start about 3A5 aileron throw % ele vator throw 1 rudder throw Bal ance model point about % in front center-of-gravity plans Fly way several flights before change anything Quick isnt youll get used after few flights Once feel comfortable model can wring out bit begin get timing right move balance point back indi cated plans will make mod el little quicker yet will also release its snapping spinning potential Snapping maneuvers Sparrows strongest suit airplane will perform two full inside outside vertical snaps still heading straight up afterwards can partial snaps precision Granted intricate tricks like gliding three quarters outside snap knife-edge flight hard learn airplane happy doing Once have sharp ened timing youll find possi bilities almost limifless youre quick enough stirring sticks chances Sparrow will almost ma neuver days hauling flying larger model doesnt seem worth trouble model like Sparrow can really help keep edge Fly singular things alone can model isnt taken seriously least right off bat improvement flying skills definitely will Radio Technique/Myers Continued page 39 Hams required listen before transmit tends limit RE interference no guarantees Any quiet spot band can used Ham operator Charging ahead used Pacific Plan dis tribute Ham-band RC0O-09 channels shown Table 4 because 20-kHz raster because expect cur rent users can obtain Gold Sticker performance Hams should get together group insist moving everything Gold Sticker soon possible tainly 1991 AMA permits even-numbered chan nels sanctioned events Hams lib erty use 10 right now park makes Gold Sticker performance neces sary safe operation 53 MHz six-meter distribution Table 5 per Pacific Plan may neces sary due 100 kHz raster Replacing transmitter batteries times have noticed transmitter out put meter reads lower usual and/or operating time shorter used common problem cell bat tery pack has developed short circuit transmitter still under warranty probably send back manufacturer wait may out warranty and/or dont want wait Decision time find replace bad cell re place whole pack order make decision must re move pack transmitter Step disconnect pack mistakes can make working electronic circuit least forgivable damage components cause too lazy disconnect power supply momentary short circuit wrong place can destroy transmitters electronics So unplug battery pack can cut both wires cant simple matter put Deans connectors 19K54 $155 Ace RIC Inc Box 511E Higginsville MO 64037 cut ends wire want reassemble transmit ter Match wire colors install Deans connectors making sure male plug side transmitter pull pins out isolated contact provide means quick visual check connecting battery pack polarity reversed matter polarity Practically everyone uses Red k y Sribnick told particular case PCM trans mitters Futaha JR Red wire charger k wire meter necessary tool working batteriesand dont assume anything Now have pack hand put number cell using pen paper stick ers attach 20-ohm 10-watt resistor pack monitor voltage cell pack discharging Write down voltages cell five-minute intervals Keep discharg ing pack until cell reads 0 VDC Leave resistor connected wont hurt anything Looking list voltages will tell cells shorted start 0 VDC whether pack balanced cells get 0 VDC about same moment unbalanced dont pack unbalanced remove resistor charge pack overnight re peat test pack still unbalanced suggestion junk because another cell probably going fail Ace R/C sells kinds Ni-Cds probably can supply what needContinued page 134 SPECIALISTS IN CUSTOM COX TEE DEE & REED ENGINES 020S 049 051S & 09S ALL CUSTOM & STOCK PARTS AVAILABLE INDIVIDUALLY MANY NEW PARTS FOR OLD DISCONTINUED COX ENGINES COX PROPS & GLOW HEADS COMPETITION ACCESSORIES & CUSTOMIZED K&B ENGINES ALSO COMPLETE LINE OF RACING PARTS - GLO-BEE FIREBALL & K&B PLUGS SOLID LINES RACING WHEELS QUICK FILLS ETC WE ALSO STOCK CARBON FIBER KLOTZ OIL LATEX & SILICONE FUEL TUBING PEN BLADDER MATERIALS & HARDTO-FIND HARDWARE ESPECIALLY 2-56 & 3-48 SIZES COILS CONDENSERS NGK & STIlT PLUGS SILK 12 COLORS QUALITY DOPE BRUSHES 5 & 7 LOOP RUBBER BANDS KSB SEELIG & IGNITION TIMERS GAS & DIESEL FUEL TUBING TRANSISTOR IGNITION SYSTEMS RESISTOR HI-TENSION LEADS 1/2A TEXACO PLAYBOY SR KIT 1/2A TEXACO ENGINES & PARTS EVERYTHING YOU NEED FOR OLD TIMER EVENTS September 1988 133 TABLE 4 50 MHz Ham Band AircraftlSurfacelOommunications Uses ARRL band plan recognizes assignment RC StalionABCDE 20-kHz raster0003010402 0705080609 OUR REV-UP INVENTORY AVERAGES OVER 9000 PROPS I! CALL FOR IMMEDIATE SHIPMENT ON VISA OR MASTERCARD TABLE 5 6-Meter Ham Band Ai rcraft/Surface/CommuniCationS Uses 100-kHz raster Sta ABCDE 533531534532535 536537538 OLD TIMER SUPPLIES ORDER BY MAIL OR PHONE 619728-4365 SORRY NO COD VISA & MASTERCARD WELCOME DEALER INQUIRES INVITED MINIMUM MERCHANDISE ORDER $1000 SHIPPING & HANDLING FEE $150 FOR INSURANCE ADD $100 ORDERS SHIPPED WITHIN 24 HOURS S ADD 6% TAX