NO OCR TEXT 1_ _ - iI-4La{ ______ tric-powered biplane looks like might actually have post-WW full-scale plane early homebuiltbut its Its entirely original design Build lot easy sport flying EMartin Irvine TWO WEEKS before 10th Annual KRC Electric Fun Fly found myself needing new airplane love NW biplanes course everyone knows Electric bipes require too much power overcome drag truly practical obvi ously have never seen Keith Shaws 60-size Stearman decided kept fuse lage fairly small number struts minimum should OKa nice slow flier What banged together two weeks what see test flew sun going down Friday September 15 11 hours before leave KRC meet Id like say flew right off board design ers have admit required three-fourths Right rudder two clicks Up elevator trim before flew straight Big deal thought amount rudder re quired because lack right thrust motor Small bipes often require sideand down-thrust haste forgot side-thrust tried model still required some right trim cant see warps anyway dont mind small amount trim down-thrust built way wing incidence 20 30 top bottom wings respectively sta bilizer incidence 2 O causes air plane fly slight downward angle ef fectively giving down-thrust flew number flights KRC meet terrific weekend anyone inter ested Electrics should attend least once got requests plans five people made think might have wider appeal article re sult specification table will tell what might want know about Krumpler just couple ad ditional notes needed first used DSC 075 motor sim ilar 075/550-size motors current generation complete kit Electric trainers sport planes bat tery pack Sanyo seven-cell 9005CR pack prop used Taipan 8 x 4 combination motor draws 19 amps calculates total power put 130 watts think airplane needs seven-cell pack use 550-type motor want reliable takeoffs grass Although can done six cells marginal much fun remotored Great Planes Goldfire motor has much poop usual 550 course ex pense much higher current over 30 amps current-limiting STW speed con troller wouldnt let 26 amps get through flight times short absurd tried Futaba MCR 4A re ceiver great success able use six-cell packs am getting ahead myself Lets build first Construction Wings make plywood master rib cut ribs sharp No11 blade center section ribs just trim A6 off top bottom surfaces Decide what size spars want make spar cut outs suit used /8 x /16 basswood spars rather uncommon sizeso might use /8 x bass spruce Don t use balsa spars wont strong weight saving would negligible Use medium weight straight-grained balsa rest wing dihedral brace ply goes between spars does shear webbing Dont leave webbing out weighs little adds lot stren2th can build either top lower wing first will constructed panel time Start laying down lower spar trailing edge Place ribs position angling root rib bit dihe dral add top spar dry ie no glue Eyeball everything assure straight use thin CyA glue things solid Add leading edge being careful shim up lined up top bottom ribs Glue wing tip pieces add vertically grained shear webbing between spars braced trailing edge gussets Now build other wing panel youre finished cut slot root ribs dihedral brace December 1990 47 No havent just landed underside view shows slight wing sweep generous tail mo ment translucent covering Barely visible fuse mount ahead lower wing cen ter section Bottom hatch Balsa rails keep motor pack seven 900SCRs centered Note wire yoke rear No 64 elastic 3A-ln dowel acts forward battery hold-down point Everythings mounted hatch base Yoke held CyA has stood some unexpected arrivals four notches sides clear cabane struts Join two halves epoxy have time make adjustments suring have correct dihedral inch side top wing 1 /2 side bottom wing Next A-in center section trailing edge piece can shaped added can leading edge A-in piece Glue center section sheet Keep mind spars flush covering dont sheet over strut fittings made A-in sheet notched interplane struts backed / ply just buttglued side ribs strong enough struts weaker wing structure will knock out break before damaging wing experience speaks Brace rear fitting %-in sq flush covering surface other wing built exactly same way Tail The stabilizer needs no explanation fin rudder built using old Free Flight technique called laminating Its easy strong looks great First cut A-in balsa blank form inside line fin rudder Dont bother wax anything Next cut seven strips soft A2 x x 24in balsa additional strip little wider Pin form down surface covered waxed paper Stack strips together using pins hold things place wrap around form slightly wider strip should inside next form use little tension pull ing strips around will find dry wood bends quite easily Once strips pinned place push laminations down flush build ing surface Now use thin CyA glue everything solid being careful get glue form slightly wider piece placed against form acts dam stop CyA sticking lam inations form Once glue has set unpin outline tum over CyA other side stack has set gently spring outline open will quickly see lam inations need glue Now thumbtack sheet fine sandpaper 48 Model Aviation Lower wing cutout radio bay has enough room lot Two 51338 right receiver battery pack sit middle Note mounted balsa floor grain across fuselage Minimal foam needed because lack vibra tion some should used protection rough landings fuselage holder on/off switch ahead wIng Construction wing outlined article Top view nose sans hatch Note side thrust DSC 075 motor Looks snug everything fits fairly easily bottom STW Sommeraur MK3 speed controller motor/controller connectors top Loose set connectors battery pack tached underside hatch XLR *8RL w/PLS I9ARTJNIRVINE 4 BRLRRj8& g Q8EL&R 6LFU- x -4 tic WfRE 4 8nL~ \\ Q N Cl 16 o5Q B l-OMERcN8 075 M0rc N 11~~~ 0 0fif i 0ji~MRIRVJNE 0 fl-VINe 51YI 0 TW PLANL OL BUDDr5HEFT IA UC NOj- VNCflcJLRUT INSIDE NDRINJNG S7Rflh ToPUJ1Io~JTH WIN& N 4BAL8R&HErT Q Q TE flat surface carefully sand out line smooth find works best hold under extended fingers sand cir cular motion Once reasonably smooth pin plan add other pieces trimming outline leave leading edge little long can act key rear fuselage upper surface Now can cut rudder free think will pleasantly surprised strong structure Fuselage Construct both basic sides 3/ square sheet best second side constructed over first small pieces wax paper glue joints pre vent two sides sticking together Note right side shorter left give built-in side thrust cabane struts will glued slotted balsa pieces fuselage Dry fit pieces groove accept 1/16 spring steel cabane wires before glu ing place Make sure slots inside surface fuselage Groove upper longerons accept cabanes add A6 sheet doubler inside both sides Note does run full length nose stops short motor bulkhead provide slot its insertion later Fill ward two bays /16 sheet Now add / x 3A6-in strips tail end let A6 sheet outside edge course time being care ful build right left sidearent assemble basic fuselage put gether upside down forward upper longerons flat against building board temporary Y6-in -sq crosspiece forward cabane mount permanent ones rear battery hatch leading trailing edges wing Now have basic box should square angles Check redo necessary cant expect plane fly straight looks like should have Chi quita painted side Once straight pull forward fuse lage together install motor bulk head Next draw rear fuselage together tail join checking straight ness Add remaining /l6 cross pieces Next bend landing gear sew landing gear bulkhead wire Spread epoxy glue over sewn joint glue assembly position fuselage doing might want temporarily attach lower wing check level rear fuselage has piece A-in sheet set between upper rear longe rons act base fin left leading edge fin little long can cut slot forward edge piece accept Dont add tail skid yet easier after have cov ered fuselage Now can add rear turtledeck form ers Cut slot center A6 x A-in stringer top center former Ad just things until stringer straight level glue place Next using straightedge very sharp blade cut slots other two stringers side equidistant center stringer upper longeron three stringers end up being flush last crosspiece just ahead fin Add diagonal bracing top bottom first add side bracing lower cowl sheeting should added yet Now get hatch Hold piece A-in sheet top trace along inside upper longerons Cut A-in sheet out leaving line Next carefully break out temporary crosspiece glued across forward center section struts landing gear bulkhead helps hold sides apart now Carefully sand hatch base until snug tight fit Glue formers place add sheeting two halves front back Now add side pieces easier add after adding sheeting before Trim cockpit outline notch sides cabane struts Add lower cowling A6 sheet wing dowels bits pieces nose Round off make nose look little like radiator Now its done Radio power installation found Continued page 155 Lower end interpiane struts Diagonal bracing apar rib iooka fiimsy Strut piastic straw roughiy-shapod balsa strip inside Wing hoids place appearance oniy Laminated outline technique fin rudder illustrated right Straight pieces brace outline against warping Rudder pushrod longer ideal because tight rear fuselage Note links use tubing keeper 50 Model Aviation Lower rear fuselage Simple tall skid dowel quite strong Note small brass locknut backing Quick Link Its railroad supplier Looks neat Dont overtighten youll weaken brass coupler fly off pavement consider using wire tall skid run antenna fin top 1116 PLYWOOD TOP WING 1/16 PLYWOOD ING DIHEDRAL BRACES DIHEDRAL- UPPER WING HERE AT EACH TIP BALSATWO STRIPS OF lAB I/B__________________ I/B3/16BASSWOOD3/161/4BALSAFILLPLY UNDERSIDE OF UPPER SPARS TOP 6 BOTTOMLEADING EDGE___________________ 1/16 BALSA SHEET 1/16 BALSA WEBTOPS BOTTOM BOTH 3/4 3/16 BALSA GRAINWINGS TRAILING EDGE R-3 BALSA FILL3/IA 1/4 BALSA LEADING EDGE 1/4 BALSA WITH _____1/64 PLY BACKING N-I N-I\WING STRUT N-S ____ N-Gil1SLOT 3/6 BALSA BALSA F-I R-26-3TRAILING EDGE F-2 B F-3HATCH EDGE I/B A SHEET~i3/43/IRTE -HATCH BASE6-I DIG MWCOT /16 WIDE SLOT WING DETAIL F-43/lA BALSA1/16IN RI AETER ASSEMA SHEETWING NAILS F51A6BALSA I/IA DIG MUSIC I: SHEETWINE CABANE F-6G-V4 3/IA SONOTE U I/IA BALSA SHEET DGUBLFR WITH LIGHTBHG HOLES 3/16 1/2 BALSA I/A 5/16 BALSA GROOVED FOR HATCH EDGE- SEECABANE3/16 50 AA5A F- CROSS SECT I/IA I/B PLY GI/4LONGTO F-4SA7 -- - --- 2 INCIDESCE I/B PLYWOOD OPTIONAL-MOTOR 3/IA SO BALSA UPRIGHT B CROSS PIECES MOTOR MOUNTSHEET ELS-WILLIAMS ELAGE SIDE VIEW /BROS ON DAVE 3/32 DIG MUSE WINEBROWN WHEELS LEAVE THE BOTTOM OF LAST I/IA BALSA SHEET FLUSH WITH OUTER EDGE WING SPAN WING AREA ELECTRIC MOTOR BATTERY PACK PROP SPECIFICATIONS I/N I6 BALSA STRINGER TYPICAL DIHEDRAL LOWER WINGI_ EACH TIP Il/B PLY 0 HEORAL BRACE 3/16 50 BALSA tB 3/16 50 BALSA 3/16 BALSA SHEET STAB 3/IA S/B BALSA 3/IA 1/3 BALSA 3/16 SQ BALSA HINGE TO SUIT C ELEV I/B PLYWOOD 3/32 DIG LANDING GEARMUSIC WINE SEE CONSTRUCTION DETAIL FRONT REAR I/A DIA MUSIC WIRE NOTCH TO GIVE CABANEEPOXY GRIP hPATTERN 0I23456 MODEL AVIATION KRUMPLER DESIGNED BY MARTIN IRVINE 39-I/U 500 55 IN SAC 075 SANYO 7 CELLTRACING BY 30E DEMARCO TAIPAN 5 4 RIGHTS RESERVED 0 0 I0 0 CD 0 CD 2 0 CD -I -L Co 0 0 U World Engines$25-$35 72 MHz NB receivers offered RCD types $6995 Other 27 50 53 72 75 MHz com plete RC service Speed controls chargers repaired P & H $5-$lO Tim Abrens/Aero Electronics 127 Route 6 Box 54J Austin TX 78737 72 MHz transmitters serviced Ace RC Futaba FM sticker$10 AM conversion $15 Alignment plus crystals$40-$5O Other 27 50 75 MHz bands ser viced Custom applications Ni-Cd peak detector chargers P & H $6-$9 Authorized RC Service 128 327 South Stage Coach Lane Fallbrook CA 92028 tel 1-601/728-0440 Open Wed nesday Thursday Friday Saturday 10 am-230 pm 72 MHz transmitters serviced Ace Air tronics Cannon Cox Futaba Hobby Shack Kraft Pro-Line others 72 MHz receivers offered RCD $6995 plus crystal$695 Ace$75$115 P & H $5-$8 Bill Slayton 129 1005 Phillips Drive Dumas TX 79029 E L Lltchfield 130 4707 Woodside Manor Tampa Fl 33624 tel 1-813/8785382 Peter Calvagna 131 1092 Becker School Rd Freeport IL 61032 Thomas Albrlght 132 7303 Stony Hill Rd Wake Forest NC 27587 Krumpler/Irvine Continued page 50 Krumpler threatening end up nose heavy put motor battery aft end hatch Two Y6-sq strips glued bottom hatch spac ing equal width power pack pack rested between Next wire yoke glued rear hatch angled dowel added forward end battery placed between wood strips held place #64 rubberband stretched between yoke dowel first time have used technique works well shall use again makes battery access easy hatch itself held #32 rubberband looped over hatch forward wing dowels Its crude effec tive going use MCR 4A re ceiver add cooling scoops sides nose top hatch will help keep receivers MOSFETs metal oxide-semiconductor field-effect transis torsEd cool efficient kept way Servos mounted far back possi ble put cross sheet /16 below bat tery pack placed receiver initially midsized FMlO7N its battery pack 5R300 mAh between lower wing speed controller Sommerauer Mk 3 25-amp 6- 14-cell unit under motor current-limiting de sign installed fuse under cowling anyway first saw particular arrangement issue newsletter Electric Model Flyers Southern Ontario EMF SO Two Sermos connector housings glued together piece /16 ply tween two small pieces /32 ply AEROMODEL GIANT SHARK ARC PRE-BUILT 0 SHARK $21495 SEE YOUR HOBBY DEALER EIRST SEND STAMPED #10 ENVELOPE POR INFO KINGS WAY RIG HOBBY SUPPLY 5559 RICHMOND HOUSTON TX 77056 DEALERS ONLY 1-800-621-7783 December 1990 155 Sound Supression Oesign High Thrust Efficiency Long Fiber Advanced Composite Material Proven Performance US Masters US Nation als Canadian Nationals World Champion ships Spoits Sizes 57x3 7x3 7x4 7x5 7x6 7x7 7x8 7x9 7x10$159EACH 8x4 8x5 BxB 8x7 8x8 SxS BxlO $179 EACH 9x4 9x5 9x6 9x7 9x8 9x9 9x10 $199 EACH 95x45 10x6 lOx 7 10x8 10x9 lOx 10 $229 EACH 11 xB 11 x7 11 xB 11 x9 12x6 12x7 12x8 ..$289EACH Competition 11 xlO 11 xli 11 x12 11 xl2W 11 x13 11 x14 12x9 12x9W12x10 l2xlOW 12x11 l2xllN 12x 12 12x12N 12x 13 12x13N 12x14 $795 EACH 135 x 125 135 x 14 14 x8 14x 10 14x 12 14x 14 144 x 105 144 x 12 $1295 EACH Contact local hobby dealer Manufactured Landing Products Knights Landing California glued inside housings order put contact under pressure assembly glued A2-in mounting plate turn mounted aircraft nice part about have fused system safety can use arming switch removing replacing fuse Off might want attach fuse airframe short length cord dont lose have used system number models though speed controller limits amperage fully stalled motor fuse doesnt blow al though certainly will control ler Later changed radio Futaba Electric radio MCR 4A receiver dropped weight about four oun ces sneezed Graupner 8 x 4 prop seven 900SCR Ni-Cd cells motor Goldfire now draws over 30 amps according DSC ammeter original current-limiting STW control ler wouldnt pass 26 amps amounts input over 200 wattsor about 100 watts per pound model weight Rocket-propelled biplanes cup tea substituted six-cell l200SC pack dropped peak current freshly charged pack 27 amps 162 watts still potent combination has poop original setup Interestingly requires side thrust before may due fact removal two-ounce speed controller nose aircraft moved CG aft bit made controls little sensitive added air scoops made plastic spoons nose increase airflow over MCR 4As MOSFETs con troller isnt supposed handle current magnitude However have run set seven 900SCRs down just cool ing see photos using Graupner 8 x 4 prop 30-plus amps ini tially shut down after 105 sec let cool got just 15 sec Therefore would guess would have worked air adding scoops much better MOSFETs As now land can feel MOS FETs cool touch remove battery pack have heard people having difficulty radios such shutting down motor too soon being able handle 15 amps Another local flier has similar results both MCR 4A units think troubles other people have must defec tive units some other installation problem complaint radio 50-Hz controller isnt very good fer rite motors time magnets will lose power sounds slightly rough lower throttle settings right applica tion think great little rig Certainly have respect now know what can Its keeper MtCfled Performance system TOP PERFORMANCE K&B ENGINES AirplaneMarine K&B FUELS K&B GLOW PLUGS 9 Blends4 Chsices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B Micro-Bailsons FILLtR K&B SUPER FOXY RESIN K&B THINNER K&B SUPER POXY PRIMER K&P IIPPR pesy PaINT note wiring connectors may order Use good stuff Cheap power systems need best expensive sys tems deserve have standardized con nectors sold Sermos same Anderson Power Poles available Hobby Horn Sermos Jomar SR number other Electric suppliers best avallable Similarly use specialty wire same suppliers youre sure something phone will help out right over phone object using wire minimize losses electrical system Theres no point wasting power dont need cost best especially compared cost airplane very small Covering Any iron-on film market will work well aircraft because strength wing thanks hard wood spars covered entire airframe lightest Coverite Micafilm V ozIyd us ing Balsarite adhesive find clear easier put colored gives airplane clear-doped tissue look also shows off construction rather well provides incentive good work careful adhere covering rib spar extra strength imparts can trim film wish over 156 Model Aviation 555 APCJ APC PROPELLERS CULPEPPEE C MODELS INC 2526 Washington DubuqueIA 52W1 31915334839 Micaflim Assembly Glue wing hold-down dow els rubberband bottom wing position Next slide formed center sec tion struts place Lift out Ae-dia holes fuselage until top wing sits indicated angle inci dence Robart incidence meter works well Remove make sure free surface oil grease notched provide good grip glue Smear slow-setting epoxy drip some holes reassemble Again check angle incidence checking upper lower wing tips same distance apart satisfied let set overnight Now top cross pieces bent bound center section struts soldered Ply wood strips used provide bearing sur faces positive location keying wing glued top wing cut ting away some film ensure ade quate adhesion used quite crude locat ing system because tight schedule building model plan shows abet ter can add some balsa strips simulate scalelike struts make sure wont foul battery hatch wing attachment finished care fully glue stab fin place making sure straight used Sig CA hinges original Williams Bros 2-in wheels used undercarriage About time tail skid can added nonfunctional interplane struts made slightly rounded /t6 balsa inside large plastic drinking straws de signed held place wing ten sion meant come out break before wing damaged case hard landing hitting something Now can balance airplane best procedure try move things around inside necessary achieve cor rect balance rather adding balance weights following summary originals weights 1 oz grams Top wing complete uncovered46 gm Balsarite adhesive3 gm Covered54 gm Covered lettered59 gm Bottom wing 3 grams less Fuselage complete dowels cabane wires landing gear no pushrods wheels cabane cross wiresun covered78 gm Balsarite adhesive2 gm Covered83 gm Stabilizer elevator uncovered 8 gm Coveredil gm Fin rudder uncovered4 gm CoveredS gm Total airframe12 oz Radio weight75 oz later MCR 4A RX35 oz SEE YOUR DEALER OR ORIER DIRECT PLEASE ENTER MY ORDER FORFUEL WJZZARDS AT $ 750 EACh POSTAGE PAID NAMESTREET_______________________ CITYSTATE_______________ ZIP_________ Motor weight connectors prop adapter9 oz Battery weight connectors 7 x 900SCRlO5 oz 6 x 12005CRuS oz Total flying weight STW reg ular radio 7 x 900s39 oz Total flying weight MCR 4A ra dio 6 x 1200s36 oz Flying As stated introduction original Krumpler required Right little Up trim Level flight maintained throttle quick takeoffs aer obatics require full nearly full throttle landing gear fairly far forward have ready correct swing takeoff isnt hard So far have ground looped Krumpler once its test flight before knew much right trim would neces sary takes off less 50 ft no wind less breeze keep flat after breaks ground gain little speed before start pulling much elevator Keep first flight two gentle until have feel airplane Later can throw around rudder throw quite sufficient elevator figure eights very small area Loops fairly straightforward require either nearly-full power lit tle dive first better wind Continued page 162 NOWATWO TAPE SET tape youve waiting finally herell youre new bobby just want learn secret wood plane construction YOU PLANE VIDEO Presents BUILDING IT RIGHT THE FIRST TIME FIRST NO-NONSENSE VIDEO OF WOOD AIRCRAFT CONSTRUCTION APPROX 4 HOURS ON eFuel tank installation eNew engine setup 0 Fuselage construction OBUILDING STRAIGHT C Installing pushrods C Covering film C Eliminating warps e Aligning Salancing C Final checkout ePLUS MUCH MORE! Radio installation Straight wing building Installing hinges C Shear webbing Applying PG cloth S Servo installation Setting up new radio Dozens building tips Slab tall surfaces Aileron installation CREDIT CARD CUSTOMERS Use toll free number place order Have VIS4 MasterCard VISA ready calI.24HR5 DAY OR mail $3495 S & H Iforelge orders add $800 5/H PLANE VIDEO terCaPO Box 23128 Cliv Iowa 50325 Iowa residents add 4%sales tax PLAN vicevanG1Ou1LO 7 fliuvYti FREEI800I 38382 5VTOLL FREE 24HR24HR OR 5151223-0897 December 1990 157 FUEL WIZZARD THE WORLDS FASTEST AND MOST CONVENIENT FUEL PUMP EVER * FITS ALL GALLON FUEL BOTTLES * FAST ONE STROKE LL OUNCE OF FUEL * ALL FUEL SAFE GLO FUEL & GASOLINE SUGGESTED RETAIL $995 NOW JUST $750 ORDER FROM ACME PLASTIC PUMP CO P 0 BOX 24551 MINNEAPOLIS MN 55424 DEALER INQUIRIES INVITE) FILLS THE LARGEST MODEL FUEL TANKS IN SECONDS Krumpler/Irvine Continued page 157 loops deteriorating plane falling off top battery running down its time pian landing Spins require CG further back whit used initially removal two-ounce speed controller nose can get spin little power just top stall needs blast air across tail get going Stall turns easy Just go power push stick over Snap rolls level flight just easy Feed little Up elevator just see nose start rise pull stick right over full back zips right around actually pauses level flight before going spiral dive pause cue let go stick can make way down length field snapping 10 20 yards stall turn other end repeat comine other way glide moderate remember bi planes draggy better struts Nevertheless find biplane struts mildly offensive usually have Make first few approaches bat tery power left have option going around rumbling generally fly until detect slight drop power cut throttle come just last little bit reserve SCR cells have sharp discharge knee almost like running out fuel whereas SCs give about 30second warning airplane best calm weather steady breeze 1989 KRC Fun Fly quite windy varied constant fine Krumpler gusty flyable much fun best time have far has evening flying wind has dropped THE WIREMASTER TM bessderutcolter extra large handle bends 1/8-1/4 coils S/ 32-3116 music wire Wlre peep eliminated ANTI-KREEP WIRE LOCKTh free catalog also has hardware accessories JOM COMPANY 114 Washfrlgton T Dept Waukegan IL 60095 can shoot touch-and-go after another admiring set ting sun shines through covering put skis winter flying put Goldfire Flying qualities deterior ated slightly because extra drag weight skis nothing major Conclusion What might change sec ond Krumpler might shorten nose bit build straight wings ease ten dency towards nose-heaviness might turn something else air Krumpler has bit Tiger Moth itand little Bucker Jungmann well creative modeler might take few minor changes create nice small Scale Electric last point build Krum pler please send comments photo Martin Irvine 34 Beaver Crescent Kingston Ontario Canada K7M 7C 1 will answer correspondence would appreciate sending stamp RC Helicopters/Jolly Continued page 52 Concept 30 SX complete highperformance package expert fliers Kit Concept 30 SX arrived nicely packaged gold box vividly displaying SXs sleek lines lid slid off parts exposed evident Concept 30 SX pure Kyosho kit features excellent quality obvious thought put part SX shipped standard Concept struction manual two separate addendum sheets pertain specifically SX Kyosho understands multinational necessity clear pictures result manuals feature ex cellent illustrations just enough text take over rough spots standard Concept manual over 30 pages super piece work Anyone can build Concept merely looking pictures matching parts fas teners Concept 30 SX difficult assemble Following instructions letter took under seven hours start finish Youll have no problems Ill expand just briefly few steps feel may lacking text Step 11 Set clutch lining place glue thin CyA add glue first youll tiAWIUKUUKKILANE RAF WAS GLAD TO H4 YE t SPITFIRE RIJTITIA4D TO HAVE T pSIS 00 01501 Add Si 500 hEFIa Usa VISAs MC 015151050 015 COO Polyester HaM Laid Fibealaaa1/aS Soale Fuselage ngspan.50 noVas lete eels aod llardwaeFuse LengTh. 0353 lncttea Paclsages IndudadWeight.12 Lbs Meotrina Cut Foam Adog Cares Fonssr.2oy5OTs 108 Any 125 / Heavy Duty Styiene Clam Canopy1mm Legal / Flbertleas Cowl Fuse H Molded Stringers Easy RuildEsay Fly Esoellent Beginnem Waibjid SoossassIss AesHaWe 55550 reps s sed Fplns trawsa SeataTkea8t5jbs55alieht0tats IR5m5 5 LRta 054 Las 0th /S KIt AeettRhe Wue isa. a WutS leSs 750*5 Pes.ZeyW Ta toe Aan tss Jte Pun 551 a. P5351 P P-a ME-flOsS Nasmyx 1LU3Mesa Ms5oTan8 ml P5133 035331 l-amoaavImn never get lining belongs before sticks itself tableyou get pic ture step 13 main frame assembly call out 2 x 3 x 10mm-long self-tapping screws illustration shows could shorter hold cooling shroud place fact screws too long will bind up clutch bell step 19 tail rotor assembly make sure use plastic-compatible screw cement supplied kit good job tightening pitch ring nut slide bushing assembly could better designed allow positive grip during assembly would help ensure nut will separate bushing dur ing use step 21 dont glue new control rod sup ports place Instead decide go apply -in strip vinyl electrical trim tape boom Rub edges tape down well slide supports position twisting motion Youll find fit snugly removable can also put some tape boom under horizontal stabilizer help snug up step 31 installation canopy should use additional two screws front lower sides canopy keep decals lifting canopy front edge Id like add suggestions just no way intended detract Concept manual excellent build ing aid kit complete Concept yos would literally have try fail keep achieving success What radio Concept SX used Air tronics Vanguard six-channel FM system SGX gyro transmitter features dual rates elevator aileron has idle up setting pitch trim revolution mix throttle hold servo reversing switches todays standards Vanguard rates very basic heli system Unlike PCM 10 1024 hell pilots will able use everything Vanguard-type sys tem Its perfect beginner will per form contest system Novice Scale maybe far Intermediate since can per form upright maneuvers SGX system comes gyro mixer dedicated tail rotor servo features single adjustable gain reversing switch FAt caliber its perfect novice will want set gain up high authority adjust gyro suit taste pro gresses SGX will also find favor fixedwing tail-dragger pilots think its just ticket short-coupled Scale ship gets fe isty takeoff Check out couldnt easier install Vanguard performed admirably glitch think however suitable training SX will capable everything expert will want SX mind switched over Air tronics Spectra 7 PCM radio still pre microprocessor has enough bells whis tles allow competent pilot explore SXs inverted capabilities motivator power used standard 05 32 FSR H coupled Vortexs Eikohgiken C 30 muffler What can say about start idle produce lot powerall good things want heli motor C 30 seems help out power department has added advantage allowing adjust low idle mixture motor once course 162 Model Aviation Rubber ft Ongine Power Free Flight Display Control Line Eleotric Power RIC Airplenee new liluetrated 32 page tabloId size catalog US ft Canade $100 Foreigh $300 Penn Valley Hobby Center 837-A W Main St Lanadale PA 18446 215 368-0770 ZENOAH SACHS-DOLMAR & QUADRA ENGINES ERCOUPE TOMAHAWK & J-3 KITIEN KITS ZINGER & DYNATHRUST PROPS FUEL TANKS Carbon-Fiber Arrowahafte Ceconite & Glue DGA & MGA PILOTS Send $100 catalog JIM MESSERS QUALITY MODEL PRODUCTS Valley View Dr Box 43 Allegany NY 14706
Edition: Model Aviation - 1990/12
Page Numbers: 46, 47, 48, 49, 50, 51, 155, 156, 157, 162
NO OCR TEXT 1_ _ - iI-4La{ ______ tric-powered biplane looks like might actually have post-WW full-scale plane early homebuiltbut its Its entirely original design Build lot easy sport flying EMartin Irvine TWO WEEKS before 10th Annual KRC Electric Fun Fly found myself needing new airplane love NW biplanes course everyone knows Electric bipes require too much power overcome drag truly practical obvi ously have never seen Keith Shaws 60-size Stearman decided kept fuse lage fairly small number struts minimum should OKa nice slow flier What banged together two weeks what see test flew sun going down Friday September 15 11 hours before leave KRC meet Id like say flew right off board design ers have admit required three-fourths Right rudder two clicks Up elevator trim before flew straight Big deal thought amount rudder re quired because lack right thrust motor Small bipes often require sideand down-thrust haste forgot side-thrust tried model still required some right trim cant see warps anyway dont mind small amount trim down-thrust built way wing incidence 20 30 top bottom wings respectively sta bilizer incidence 2 O causes air plane fly slight downward angle ef fectively giving down-thrust flew number flights KRC meet terrific weekend anyone inter ested Electrics should attend least once got requests plans five people made think might have wider appeal article re sult specification table will tell what might want know about Krumpler just couple ad ditional notes needed first used DSC 075 motor sim ilar 075/550-size motors current generation complete kit Electric trainers sport planes bat tery pack Sanyo seven-cell 9005CR pack prop used Taipan 8 x 4 combination motor draws 19 amps calculates total power put 130 watts think airplane needs seven-cell pack use 550-type motor want reliable takeoffs grass Although can done six cells marginal much fun remotored Great Planes Goldfire motor has much poop usual 550 course ex pense much higher current over 30 amps current-limiting STW speed con troller wouldnt let 26 amps get through flight times short absurd tried Futaba MCR 4A re ceiver great success able use six-cell packs am getting ahead myself Lets build first Construction Wings make plywood master rib cut ribs sharp No11 blade center section ribs just trim A6 off top bottom surfaces Decide what size spars want make spar cut outs suit used /8 x /16 basswood spars rather uncommon sizeso might use /8 x bass spruce Don t use balsa spars wont strong weight saving would negligible Use medium weight straight-grained balsa rest wing dihedral brace ply goes between spars does shear webbing Dont leave webbing out weighs little adds lot stren2th can build either top lower wing first will constructed panel time Start laying down lower spar trailing edge Place ribs position angling root rib bit dihe dral add top spar dry ie no glue Eyeball everything assure straight use thin CyA glue things solid Add leading edge being careful shim up lined up top bottom ribs Glue wing tip pieces add vertically grained shear webbing between spars braced trailing edge gussets Now build other wing panel youre finished cut slot root ribs dihedral brace December 1990 47 No havent just landed underside view shows slight wing sweep generous tail mo ment translucent covering Barely visible fuse mount ahead lower wing cen ter section Bottom hatch Balsa rails keep motor pack seven 900SCRs centered Note wire yoke rear No 64 elastic 3A-ln dowel acts forward battery hold-down point Everythings mounted hatch base Yoke held CyA has stood some unexpected arrivals four notches sides clear cabane struts Join two halves epoxy have time make adjustments suring have correct dihedral inch side top wing 1 /2 side bottom wing Next A-in center section trailing edge piece can shaped added can leading edge A-in piece Glue center section sheet Keep mind spars flush covering dont sheet over strut fittings made A-in sheet notched interplane struts backed / ply just buttglued side ribs strong enough struts weaker wing structure will knock out break before damaging wing experience speaks Brace rear fitting %-in sq flush covering surface other wing built exactly same way Tail The stabilizer needs no explanation fin rudder built using old Free Flight technique called laminating Its easy strong looks great First cut A-in balsa blank form inside line fin rudder Dont bother wax anything Next cut seven strips soft A2 x x 24in balsa additional strip little wider Pin form down surface covered waxed paper Stack strips together using pins hold things place wrap around form slightly wider strip should inside next form use little tension pull ing strips around will find dry wood bends quite easily Once strips pinned place push laminations down flush build ing surface Now use thin CyA glue everything solid being careful get glue form slightly wider piece placed against form acts dam stop CyA sticking lam inations form Once glue has set unpin outline tum over CyA other side stack has set gently spring outline open will quickly see lam inations need glue Now thumbtack sheet fine sandpaper 48 Model Aviation Lower wing cutout radio bay has enough room lot Two 51338 right receiver battery pack sit middle Note mounted balsa floor grain across fuselage Minimal foam needed because lack vibra tion some should used protection rough landings fuselage holder on/off switch ahead wIng Construction wing outlined article Top view nose sans hatch Note side thrust DSC 075 motor Looks snug everything fits fairly easily bottom STW Sommeraur MK3 speed controller motor/controller connectors top Loose set connectors battery pack tached underside hatch XLR *8RL w/PLS I9ARTJNIRVINE 4 BRLRRj8& g Q8EL&R 6LFU- x -4 tic WfRE 4 8nL~ \\ Q N Cl 16 o5Q B l-OMERcN8 075 M0rc N 11~~~ 0 0fif i 0ji~MRIRVJNE 0 fl-VINe 51YI 0 TW PLANL OL BUDDr5HEFT IA UC NOj- VNCflcJLRUT INSIDE NDRINJNG S7Rflh ToPUJ1Io~JTH WIN& N 4BAL8R&HErT Q Q TE flat surface carefully sand out line smooth find works best hold under extended fingers sand cir cular motion Once reasonably smooth pin plan add other pieces trimming outline leave leading edge little long can act key rear fuselage upper surface Now can cut rudder free think will pleasantly surprised strong structure Fuselage Construct both basic sides 3/ square sheet best second side constructed over first small pieces wax paper glue joints pre vent two sides sticking together Note right side shorter left give built-in side thrust cabane struts will glued slotted balsa pieces fuselage Dry fit pieces groove accept 1/16 spring steel cabane wires before glu ing place Make sure slots inside surface fuselage Groove upper longerons accept cabanes add A6 sheet doubler inside both sides Note does run full length nose stops short motor bulkhead provide slot its insertion later Fill ward two bays /16 sheet Now add / x 3A6-in strips tail end let A6 sheet outside edge course time being care ful build right left sidearent assemble basic fuselage put gether upside down forward upper longerons flat against building board temporary Y6-in -sq crosspiece forward cabane mount permanent ones rear battery hatch leading trailing edges wing Now have basic box should square angles Check redo necessary cant expect plane fly straight looks like should have Chi quita painted side Once straight pull forward fuse lage together install motor bulk head Next draw rear fuselage together tail join checking straight ness Add remaining /l6 cross pieces Next bend landing gear sew landing gear bulkhead wire Spread epoxy glue over sewn joint glue assembly position fuselage doing might want temporarily attach lower wing check level rear fuselage has piece A-in sheet set between upper rear longe rons act base fin left leading edge fin little long can cut slot forward edge piece accept Dont add tail skid yet easier after have cov ered fuselage Now can add rear turtledeck form ers Cut slot center A6 x A-in stringer top center former Ad just things until stringer straight level glue place Next using straightedge very sharp blade cut slots other two stringers side equidistant center stringer upper longeron three stringers end up being flush last crosspiece just ahead fin Add diagonal bracing top bottom first add side bracing lower cowl sheeting should added yet Now get hatch Hold piece A-in sheet top trace along inside upper longerons Cut A-in sheet out leaving line Next carefully break out temporary crosspiece glued across forward center section struts landing gear bulkhead helps hold sides apart now Carefully sand hatch base until snug tight fit Glue formers place add sheeting two halves front back Now add side pieces easier add after adding sheeting before Trim cockpit outline notch sides cabane struts Add lower cowling A6 sheet wing dowels bits pieces nose Round off make nose look little like radiator Now its done Radio power installation found Continued page 155 Lower end interpiane struts Diagonal bracing apar rib iooka fiimsy Strut piastic straw roughiy-shapod balsa strip inside Wing hoids place appearance oniy Laminated outline technique fin rudder illustrated right Straight pieces brace outline against warping Rudder pushrod longer ideal because tight rear fuselage Note links use tubing keeper 50 Model Aviation Lower rear fuselage Simple tall skid dowel quite strong Note small brass locknut backing Quick Link Its railroad supplier Looks neat Dont overtighten youll weaken brass coupler fly off pavement consider using wire tall skid run antenna fin top 1116 PLYWOOD TOP WING 1/16 PLYWOOD ING DIHEDRAL BRACES DIHEDRAL- UPPER WING HERE AT EACH TIP BALSATWO STRIPS OF lAB I/B__________________ I/B3/16BASSWOOD3/161/4BALSAFILLPLY UNDERSIDE OF UPPER SPARS TOP 6 BOTTOMLEADING EDGE___________________ 1/16 BALSA SHEET 1/16 BALSA WEBTOPS BOTTOM BOTH 3/4 3/16 BALSA GRAINWINGS TRAILING EDGE R-3 BALSA FILL3/IA 1/4 BALSA LEADING EDGE 1/4 BALSA WITH _____1/64 PLY BACKING N-I N-I\WING STRUT N-S ____ N-Gil1SLOT 3/6 BALSA BALSA F-I R-26-3TRAILING EDGE F-2 B F-3HATCH EDGE I/B A SHEET~i3/43/IRTE -HATCH BASE6-I DIG MWCOT /16 WIDE SLOT WING DETAIL F-43/lA BALSA1/16IN RI AETER ASSEMA SHEETWING NAILS F51A6BALSA I/IA DIG MUSIC I: SHEETWINE CABANE F-6G-V4 3/IA SONOTE U I/IA BALSA SHEET DGUBLFR WITH LIGHTBHG HOLES 3/16 1/2 BALSA I/A 5/16 BALSA GROOVED FOR HATCH EDGE- SEECABANE3/16 50 AA5A F- CROSS SECT I/IA I/B PLY GI/4LONGTO F-4SA7 -- - --- 2 INCIDESCE I/B PLYWOOD OPTIONAL-MOTOR 3/IA SO BALSA UPRIGHT B CROSS PIECES MOTOR MOUNTSHEET ELS-WILLIAMS ELAGE SIDE VIEW /BROS ON DAVE 3/32 DIG MUSE WINEBROWN WHEELS LEAVE THE BOTTOM OF LAST I/IA BALSA SHEET FLUSH WITH OUTER EDGE WING SPAN WING AREA ELECTRIC MOTOR BATTERY PACK PROP SPECIFICATIONS I/N I6 BALSA STRINGER TYPICAL DIHEDRAL LOWER WINGI_ EACH TIP Il/B PLY 0 HEORAL BRACE 3/16 50 BALSA tB 3/16 50 BALSA 3/16 BALSA SHEET STAB 3/IA S/B BALSA 3/IA 1/3 BALSA 3/16 SQ BALSA HINGE TO SUIT C ELEV I/B PLYWOOD 3/32 DIG LANDING GEARMUSIC WINE SEE CONSTRUCTION DETAIL FRONT REAR I/A DIA MUSIC WIRE NOTCH TO GIVE CABANEEPOXY GRIP hPATTERN 0I23456 MODEL AVIATION KRUMPLER DESIGNED BY MARTIN IRVINE 39-I/U 500 55 IN SAC 075 SANYO 7 CELLTRACING BY 30E DEMARCO TAIPAN 5 4 RIGHTS RESERVED 0 0 I0 0 CD 0 CD 2 0 CD -I -L Co 0 0 U World Engines$25-$35 72 MHz NB receivers offered RCD types $6995 Other 27 50 53 72 75 MHz com plete RC service Speed controls chargers repaired P & H $5-$lO Tim Abrens/Aero Electronics 127 Route 6 Box 54J Austin TX 78737 72 MHz transmitters serviced Ace RC Futaba FM sticker$10 AM conversion $15 Alignment plus crystals$40-$5O Other 27 50 75 MHz bands ser viced Custom applications Ni-Cd peak detector chargers P & H $6-$9 Authorized RC Service 128 327 South Stage Coach Lane Fallbrook CA 92028 tel 1-601/728-0440 Open Wed nesday Thursday Friday Saturday 10 am-230 pm 72 MHz transmitters serviced Ace Air tronics Cannon Cox Futaba Hobby Shack Kraft Pro-Line others 72 MHz receivers offered RCD $6995 plus crystal$695 Ace$75$115 P & H $5-$8 Bill Slayton 129 1005 Phillips Drive Dumas TX 79029 E L Lltchfield 130 4707 Woodside Manor Tampa Fl 33624 tel 1-813/8785382 Peter Calvagna 131 1092 Becker School Rd Freeport IL 61032 Thomas Albrlght 132 7303 Stony Hill Rd Wake Forest NC 27587 Krumpler/Irvine Continued page 50 Krumpler threatening end up nose heavy put motor battery aft end hatch Two Y6-sq strips glued bottom hatch spac ing equal width power pack pack rested between Next wire yoke glued rear hatch angled dowel added forward end battery placed between wood strips held place #64 rubberband stretched between yoke dowel first time have used technique works well shall use again makes battery access easy hatch itself held #32 rubberband looped over hatch forward wing dowels Its crude effec tive going use MCR 4A re ceiver add cooling scoops sides nose top hatch will help keep receivers MOSFETs metal oxide-semiconductor field-effect transis torsEd cool efficient kept way Servos mounted far back possi ble put cross sheet /16 below bat tery pack placed receiver initially midsized FMlO7N its battery pack 5R300 mAh between lower wing speed controller Sommerauer Mk 3 25-amp 6- 14-cell unit under motor current-limiting de sign installed fuse under cowling anyway first saw particular arrangement issue newsletter Electric Model Flyers Southern Ontario EMF SO Two Sermos connector housings glued together piece /16 ply tween two small pieces /32 ply AEROMODEL GIANT SHARK ARC PRE-BUILT 0 SHARK $21495 SEE YOUR HOBBY DEALER EIRST SEND STAMPED #10 ENVELOPE POR INFO KINGS WAY RIG HOBBY SUPPLY 5559 RICHMOND HOUSTON TX 77056 DEALERS ONLY 1-800-621-7783 December 1990 155 Sound Supression Oesign High Thrust Efficiency Long Fiber Advanced Composite Material Proven Performance US Masters US Nation als Canadian Nationals World Champion ships Spoits Sizes 57x3 7x3 7x4 7x5 7x6 7x7 7x8 7x9 7x10$159EACH 8x4 8x5 BxB 8x7 8x8 SxS BxlO $179 EACH 9x4 9x5 9x6 9x7 9x8 9x9 9x10 $199 EACH 95x45 10x6 lOx 7 10x8 10x9 lOx 10 $229 EACH 11 xB 11 x7 11 xB 11 x9 12x6 12x7 12x8 ..$289EACH Competition 11 xlO 11 xli 11 x12 11 xl2W 11 x13 11 x14 12x9 12x9W12x10 l2xlOW 12x11 l2xllN 12x 12 12x12N 12x 13 12x13N 12x14 $795 EACH 135 x 125 135 x 14 14 x8 14x 10 14x 12 14x 14 144 x 105 144 x 12 $1295 EACH Contact local hobby dealer Manufactured Landing Products Knights Landing California glued inside housings order put contact under pressure assembly glued A2-in mounting plate turn mounted aircraft nice part about have fused system safety can use arming switch removing replacing fuse Off might want attach fuse airframe short length cord dont lose have used system number models though speed controller limits amperage fully stalled motor fuse doesnt blow al though certainly will control ler Later changed radio Futaba Electric radio MCR 4A receiver dropped weight about four oun ces sneezed Graupner 8 x 4 prop seven 900SCR Ni-Cd cells motor Goldfire now draws over 30 amps according DSC ammeter original current-limiting STW control ler wouldnt pass 26 amps amounts input over 200 wattsor about 100 watts per pound model weight Rocket-propelled biplanes cup tea substituted six-cell l200SC pack dropped peak current freshly charged pack 27 amps 162 watts still potent combination has poop original setup Interestingly requires side thrust before may due fact removal two-ounce speed controller nose aircraft moved CG aft bit made controls little sensitive added air scoops made plastic spoons nose increase airflow over MCR 4As MOSFETs con troller isnt supposed handle current magnitude However have run set seven 900SCRs down just cool ing see photos using Graupner 8 x 4 prop 30-plus amps ini tially shut down after 105 sec let cool got just 15 sec Therefore would guess would have worked air adding scoops much better MOSFETs As now land can feel MOS FETs cool touch remove battery pack have heard people having difficulty radios such shutting down motor too soon being able handle 15 amps Another local flier has similar results both MCR 4A units think troubles other people have must defec tive units some other installation problem complaint radio 50-Hz controller isnt very good fer rite motors time magnets will lose power sounds slightly rough lower throttle settings right applica tion think great little rig Certainly have respect now know what can Its keeper MtCfled Performance system TOP PERFORMANCE K&B ENGINES AirplaneMarine K&B FUELS K&B GLOW PLUGS 9 Blends4 Chsices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B Micro-Bailsons FILLtR K&B SUPER FOXY RESIN K&B THINNER K&B SUPER POXY PRIMER K&P IIPPR pesy PaINT note wiring connectors may order Use good stuff Cheap power systems need best expensive sys tems deserve have standardized con nectors sold Sermos same Anderson Power Poles available Hobby Horn Sermos Jomar SR number other Electric suppliers best avallable Similarly use specialty wire same suppliers youre sure something phone will help out right over phone object using wire minimize losses electrical system Theres no point wasting power dont need cost best especially compared cost airplane very small Covering Any iron-on film market will work well aircraft because strength wing thanks hard wood spars covered entire airframe lightest Coverite Micafilm V ozIyd us ing Balsarite adhesive find clear easier put colored gives airplane clear-doped tissue look also shows off construction rather well provides incentive good work careful adhere covering rib spar extra strength imparts can trim film wish over 156 Model Aviation 555 APCJ APC PROPELLERS CULPEPPEE C MODELS INC 2526 Washington DubuqueIA 52W1 31915334839 Micaflim Assembly Glue wing hold-down dow els rubberband bottom wing position Next slide formed center sec tion struts place Lift out Ae-dia holes fuselage until top wing sits indicated angle inci dence Robart incidence meter works well Remove make sure free surface oil grease notched provide good grip glue Smear slow-setting epoxy drip some holes reassemble Again check angle incidence checking upper lower wing tips same distance apart satisfied let set overnight Now top cross pieces bent bound center section struts soldered Ply wood strips used provide bearing sur faces positive location keying wing glued top wing cut ting away some film ensure ade quate adhesion used quite crude locat ing system because tight schedule building model plan shows abet ter can add some balsa strips simulate scalelike struts make sure wont foul battery hatch wing attachment finished care fully glue stab fin place making sure straight used Sig CA hinges original Williams Bros 2-in wheels used undercarriage About time tail skid can added nonfunctional interplane struts made slightly rounded /t6 balsa inside large plastic drinking straws de signed held place wing ten sion meant come out break before wing damaged case hard landing hitting something Now can balance airplane best procedure try move things around inside necessary achieve cor rect balance rather adding balance weights following summary originals weights 1 oz grams Top wing complete uncovered46 gm Balsarite adhesive3 gm Covered54 gm Covered lettered59 gm Bottom wing 3 grams less Fuselage complete dowels cabane wires landing gear no pushrods wheels cabane cross wiresun covered78 gm Balsarite adhesive2 gm Covered83 gm Stabilizer elevator uncovered 8 gm Coveredil gm Fin rudder uncovered4 gm CoveredS gm Total airframe12 oz Radio weight75 oz later MCR 4A RX35 oz SEE YOUR DEALER OR ORIER DIRECT PLEASE ENTER MY ORDER FORFUEL WJZZARDS AT $ 750 EACh POSTAGE PAID NAMESTREET_______________________ CITYSTATE_______________ ZIP_________ Motor weight connectors prop adapter9 oz Battery weight connectors 7 x 900SCRlO5 oz 6 x 12005CRuS oz Total flying weight STW reg ular radio 7 x 900s39 oz Total flying weight MCR 4A ra dio 6 x 1200s36 oz Flying As stated introduction original Krumpler required Right little Up trim Level flight maintained throttle quick takeoffs aer obatics require full nearly full throttle landing gear fairly far forward have ready correct swing takeoff isnt hard So far have ground looped Krumpler once its test flight before knew much right trim would neces sary takes off less 50 ft no wind less breeze keep flat after breaks ground gain little speed before start pulling much elevator Keep first flight two gentle until have feel airplane Later can throw around rudder throw quite sufficient elevator figure eights very small area Loops fairly straightforward require either nearly-full power lit tle dive first better wind Continued page 162 NOWATWO TAPE SET tape youve waiting finally herell youre new bobby just want learn secret wood plane construction YOU PLANE VIDEO Presents BUILDING IT RIGHT THE FIRST TIME FIRST NO-NONSENSE VIDEO OF WOOD AIRCRAFT CONSTRUCTION APPROX 4 HOURS ON eFuel tank installation eNew engine setup 0 Fuselage construction OBUILDING STRAIGHT C Installing pushrods C Covering film C Eliminating warps e Aligning Salancing C Final checkout ePLUS MUCH MORE! Radio installation Straight wing building Installing hinges C Shear webbing Applying PG cloth S Servo installation Setting up new radio Dozens building tips Slab tall surfaces Aileron installation CREDIT CARD CUSTOMERS Use toll free number place order Have VIS4 MasterCard VISA ready calI.24HR5 DAY OR mail $3495 S & H Iforelge orders add $800 5/H PLANE VIDEO terCaPO Box 23128 Cliv Iowa 50325 Iowa residents add 4%sales tax PLAN vicevanG1Ou1LO 7 fliuvYti FREEI800I 38382 5VTOLL FREE 24HR24HR OR 5151223-0897 December 1990 157 FUEL WIZZARD THE WORLDS FASTEST AND MOST CONVENIENT FUEL PUMP EVER * FITS ALL GALLON FUEL BOTTLES * FAST ONE STROKE LL OUNCE OF FUEL * ALL FUEL SAFE GLO FUEL & GASOLINE SUGGESTED RETAIL $995 NOW JUST $750 ORDER FROM ACME PLASTIC PUMP CO P 0 BOX 24551 MINNEAPOLIS MN 55424 DEALER INQUIRIES INVITE) FILLS THE LARGEST MODEL FUEL TANKS IN SECONDS Krumpler/Irvine Continued page 157 loops deteriorating plane falling off top battery running down its time pian landing Spins require CG further back whit used initially removal two-ounce speed controller nose can get spin little power just top stall needs blast air across tail get going Stall turns easy Just go power push stick over Snap rolls level flight just easy Feed little Up elevator just see nose start rise pull stick right over full back zips right around actually pauses level flight before going spiral dive pause cue let go stick can make way down length field snapping 10 20 yards stall turn other end repeat comine other way glide moderate remember bi planes draggy better struts Nevertheless find biplane struts mildly offensive usually have Make first few approaches bat tery power left have option going around rumbling generally fly until detect slight drop power cut throttle come just last little bit reserve SCR cells have sharp discharge knee almost like running out fuel whereas SCs give about 30second warning airplane best calm weather steady breeze 1989 KRC Fun Fly quite windy varied constant fine Krumpler gusty flyable much fun best time have far has evening flying wind has dropped THE WIREMASTER TM bessderutcolter extra large handle bends 1/8-1/4 coils S/ 32-3116 music wire Wlre peep eliminated ANTI-KREEP WIRE LOCKTh free catalog also has hardware accessories JOM COMPANY 114 Washfrlgton T Dept Waukegan IL 60095 can shoot touch-and-go after another admiring set ting sun shines through covering put skis winter flying put Goldfire Flying qualities deterior ated slightly because extra drag weight skis nothing major Conclusion What might change sec ond Krumpler might shorten nose bit build straight wings ease ten dency towards nose-heaviness might turn something else air Krumpler has bit Tiger Moth itand little Bucker Jungmann well creative modeler might take few minor changes create nice small Scale Electric last point build Krum pler please send comments photo Martin Irvine 34 Beaver Crescent Kingston Ontario Canada K7M 7C 1 will answer correspondence would appreciate sending stamp RC Helicopters/Jolly Continued page 52 Concept 30 SX complete highperformance package expert fliers Kit Concept 30 SX arrived nicely packaged gold box vividly displaying SXs sleek lines lid slid off parts exposed evident Concept 30 SX pure Kyosho kit features excellent quality obvious thought put part SX shipped standard Concept struction manual two separate addendum sheets pertain specifically SX Kyosho understands multinational necessity clear pictures result manuals feature ex cellent illustrations just enough text take over rough spots standard Concept manual over 30 pages super piece work Anyone can build Concept merely looking pictures matching parts fas teners Concept 30 SX difficult assemble Following instructions letter took under seven hours start finish Youll have no problems Ill expand just briefly few steps feel may lacking text Step 11 Set clutch lining place glue thin CyA add glue first youll tiAWIUKUUKKILANE RAF WAS GLAD TO H4 YE t SPITFIRE RIJTITIA4D TO HAVE T pSIS 00 01501 Add Si 500 hEFIa Usa VISAs MC 015151050 015 COO Polyester HaM Laid Fibealaaa1/aS Soale Fuselage ngspan.50 noVas lete eels aod llardwaeFuse LengTh. 0353 lncttea Paclsages IndudadWeight.12 Lbs Meotrina Cut Foam Adog Cares Fonssr.2oy5OTs 108 Any 125 / Heavy Duty Styiene Clam Canopy1mm Legal / Flbertleas Cowl Fuse H Molded Stringers Easy RuildEsay Fly Esoellent Beginnem Waibjid SoossassIss AesHaWe 55550 reps s sed Fplns trawsa SeataTkea8t5jbs55alieht0tats IR5m5 5 LRta 054 Las 0th /S KIt AeettRhe Wue isa. a WutS leSs 750*5 Pes.ZeyW Ta toe Aan tss Jte Pun 551 a. P5351 P P-a ME-flOsS Nasmyx 1LU3Mesa Ms5oTan8 ml P5133 035331 l-amoaavImn never get lining belongs before sticks itself tableyou get pic ture step 13 main frame assembly call out 2 x 3 x 10mm-long self-tapping screws illustration shows could shorter hold cooling shroud place fact screws too long will bind up clutch bell step 19 tail rotor assembly make sure use plastic-compatible screw cement supplied kit good job tightening pitch ring nut slide bushing assembly could better designed allow positive grip during assembly would help ensure nut will separate bushing dur ing use step 21 dont glue new control rod sup ports place Instead decide go apply -in strip vinyl electrical trim tape boom Rub edges tape down well slide supports position twisting motion Youll find fit snugly removable can also put some tape boom under horizontal stabilizer help snug up step 31 installation canopy should use additional two screws front lower sides canopy keep decals lifting canopy front edge Id like add suggestions just no way intended detract Concept manual excellent build ing aid kit complete Concept yos would literally have try fail keep achieving success What radio Concept SX used Air tronics Vanguard six-channel FM system SGX gyro transmitter features dual rates elevator aileron has idle up setting pitch trim revolution mix throttle hold servo reversing switches todays standards Vanguard rates very basic heli system Unlike PCM 10 1024 hell pilots will able use everything Vanguard-type sys tem Its perfect beginner will per form contest system Novice Scale maybe far Intermediate since can per form upright maneuvers SGX system comes gyro mixer dedicated tail rotor servo features single adjustable gain reversing switch FAt caliber its perfect novice will want set gain up high authority adjust gyro suit taste pro gresses SGX will also find favor fixedwing tail-dragger pilots think its just ticket short-coupled Scale ship gets fe isty takeoff Check out couldnt easier install Vanguard performed admirably glitch think however suitable training SX will capable everything expert will want SX mind switched over Air tronics Spectra 7 PCM radio still pre microprocessor has enough bells whis tles allow competent pilot explore SXs inverted capabilities motivator power used standard 05 32 FSR H coupled Vortexs Eikohgiken C 30 muffler What can say about start idle produce lot powerall good things want heli motor C 30 seems help out power department has added advantage allowing adjust low idle mixture motor once course 162 Model Aviation Rubber ft Ongine Power Free Flight Display Control Line Eleotric Power RIC Airplenee new liluetrated 32 page tabloId size catalog US ft Canade $100 Foreigh $300 Penn Valley Hobby Center 837-A W Main St Lanadale PA 18446 215 368-0770 ZENOAH SACHS-DOLMAR & QUADRA ENGINES ERCOUPE TOMAHAWK & J-3 KITIEN KITS ZINGER & DYNATHRUST PROPS FUEL TANKS Carbon-Fiber Arrowahafte Ceconite & Glue DGA & MGA PILOTS Send $100 catalog JIM MESSERS QUALITY MODEL PRODUCTS Valley View Dr Box 43 Allegany NY 14706
Edition: Model Aviation - 1990/12
Page Numbers: 46, 47, 48, 49, 50, 51, 155, 156, 157, 162
NO OCR TEXT 1_ _ - iI-4La{ ______ tric-powered biplane looks like might actually have post-WW full-scale plane early homebuiltbut its Its entirely original design Build lot easy sport flying EMartin Irvine TWO WEEKS before 10th Annual KRC Electric Fun Fly found myself needing new airplane love NW biplanes course everyone knows Electric bipes require too much power overcome drag truly practical obvi ously have never seen Keith Shaws 60-size Stearman decided kept fuse lage fairly small number struts minimum should OKa nice slow flier What banged together two weeks what see test flew sun going down Friday September 15 11 hours before leave KRC meet Id like say flew right off board design ers have admit required three-fourths Right rudder two clicks Up elevator trim before flew straight Big deal thought amount rudder re quired because lack right thrust motor Small bipes often require sideand down-thrust haste forgot side-thrust tried model still required some right trim cant see warps anyway dont mind small amount trim down-thrust built way wing incidence 20 30 top bottom wings respectively sta bilizer incidence 2 O causes air plane fly slight downward angle ef fectively giving down-thrust flew number flights KRC meet terrific weekend anyone inter ested Electrics should attend least once got requests plans five people made think might have wider appeal article re sult specification table will tell what might want know about Krumpler just couple ad ditional notes needed first used DSC 075 motor sim ilar 075/550-size motors current generation complete kit Electric trainers sport planes bat tery pack Sanyo seven-cell 9005CR pack prop used Taipan 8 x 4 combination motor draws 19 amps calculates total power put 130 watts think airplane needs seven-cell pack use 550-type motor want reliable takeoffs grass Although can done six cells marginal much fun remotored Great Planes Goldfire motor has much poop usual 550 course ex pense much higher current over 30 amps current-limiting STW speed con troller wouldnt let 26 amps get through flight times short absurd tried Futaba MCR 4A re ceiver great success able use six-cell packs am getting ahead myself Lets build first Construction Wings make plywood master rib cut ribs sharp No11 blade center section ribs just trim A6 off top bottom surfaces Decide what size spars want make spar cut outs suit used /8 x /16 basswood spars rather uncommon sizeso might use /8 x bass spruce Don t use balsa spars wont strong weight saving would negligible Use medium weight straight-grained balsa rest wing dihedral brace ply goes between spars does shear webbing Dont leave webbing out weighs little adds lot stren2th can build either top lower wing first will constructed panel time Start laying down lower spar trailing edge Place ribs position angling root rib bit dihe dral add top spar dry ie no glue Eyeball everything assure straight use thin CyA glue things solid Add leading edge being careful shim up lined up top bottom ribs Glue wing tip pieces add vertically grained shear webbing between spars braced trailing edge gussets Now build other wing panel youre finished cut slot root ribs dihedral brace December 1990 47 No havent just landed underside view shows slight wing sweep generous tail mo ment translucent covering Barely visible fuse mount ahead lower wing cen ter section Bottom hatch Balsa rails keep motor pack seven 900SCRs centered Note wire yoke rear No 64 elastic 3A-ln dowel acts forward battery hold-down point Everythings mounted hatch base Yoke held CyA has stood some unexpected arrivals four notches sides clear cabane struts Join two halves epoxy have time make adjustments suring have correct dihedral inch side top wing 1 /2 side bottom wing Next A-in center section trailing edge piece can shaped added can leading edge A-in piece Glue center section sheet Keep mind spars flush covering dont sheet over strut fittings made A-in sheet notched interplane struts backed / ply just buttglued side ribs strong enough struts weaker wing structure will knock out break before damaging wing experience speaks Brace rear fitting %-in sq flush covering surface other wing built exactly same way Tail The stabilizer needs no explanation fin rudder built using old Free Flight technique called laminating Its easy strong looks great First cut A-in balsa blank form inside line fin rudder Dont bother wax anything Next cut seven strips soft A2 x x 24in balsa additional strip little wider Pin form down surface covered waxed paper Stack strips together using pins hold things place wrap around form slightly wider strip should inside next form use little tension pull ing strips around will find dry wood bends quite easily Once strips pinned place push laminations down flush build ing surface Now use thin CyA glue everything solid being careful get glue form slightly wider piece placed against form acts dam stop CyA sticking lam inations form Once glue has set unpin outline tum over CyA other side stack has set gently spring outline open will quickly see lam inations need glue Now thumbtack sheet fine sandpaper 48 Model Aviation Lower wing cutout radio bay has enough room lot Two 51338 right receiver battery pack sit middle Note mounted balsa floor grain across fuselage Minimal foam needed because lack vibra tion some should used protection rough landings fuselage holder on/off switch ahead wIng Construction wing outlined article Top view nose sans hatch Note side thrust DSC 075 motor Looks snug everything fits fairly easily bottom STW Sommeraur MK3 speed controller motor/controller connectors top Loose set connectors battery pack tached underside hatch XLR *8RL w/PLS I9ARTJNIRVINE 4 BRLRRj8& g Q8EL&R 6LFU- x -4 tic WfRE 4 8nL~ \\ Q N Cl 16 o5Q B l-OMERcN8 075 M0rc N 11~~~ 0 0fif i 0ji~MRIRVJNE 0 fl-VINe 51YI 0 TW PLANL OL BUDDr5HEFT IA UC NOj- VNCflcJLRUT INSIDE NDRINJNG S7Rflh ToPUJ1Io~JTH WIN& N 4BAL8R&HErT Q Q TE flat surface carefully sand out line smooth find works best hold under extended fingers sand cir cular motion Once reasonably smooth pin plan add other pieces trimming outline leave leading edge little long can act key rear fuselage upper surface Now can cut rudder free think will pleasantly surprised strong structure Fuselage Construct both basic sides 3/ square sheet best second side constructed over first small pieces wax paper glue joints pre vent two sides sticking together Note right side shorter left give built-in side thrust cabane struts will glued slotted balsa pieces fuselage Dry fit pieces groove accept 1/16 spring steel cabane wires before glu ing place Make sure slots inside surface fuselage Groove upper longerons accept cabanes add A6 sheet doubler inside both sides Note does run full length nose stops short motor bulkhead provide slot its insertion later Fill ward two bays /16 sheet Now add / x 3A6-in strips tail end let A6 sheet outside edge course time being care ful build right left sidearent assemble basic fuselage put gether upside down forward upper longerons flat against building board temporary Y6-in -sq crosspiece forward cabane mount permanent ones rear battery hatch leading trailing edges wing Now have basic box should square angles Check redo necessary cant expect plane fly straight looks like should have Chi quita painted side Once straight pull forward fuse lage together install motor bulk head Next draw rear fuselage together tail join checking straight ness Add remaining /l6 cross pieces Next bend landing gear sew landing gear bulkhead wire Spread epoxy glue over sewn joint glue assembly position fuselage doing might want temporarily attach lower wing check level rear fuselage has piece A-in sheet set between upper rear longe rons act base fin left leading edge fin little long can cut slot forward edge piece accept Dont add tail skid yet easier after have cov ered fuselage Now can add rear turtledeck form ers Cut slot center A6 x A-in stringer top center former Ad just things until stringer straight level glue place Next using straightedge very sharp blade cut slots other two stringers side equidistant center stringer upper longeron three stringers end up being flush last crosspiece just ahead fin Add diagonal bracing top bottom first add side bracing lower cowl sheeting should added yet Now get hatch Hold piece A-in sheet top trace along inside upper longerons Cut A-in sheet out leaving line Next carefully break out temporary crosspiece glued across forward center section struts landing gear bulkhead helps hold sides apart now Carefully sand hatch base until snug tight fit Glue formers place add sheeting two halves front back Now add side pieces easier add after adding sheeting before Trim cockpit outline notch sides cabane struts Add lower cowling A6 sheet wing dowels bits pieces nose Round off make nose look little like radiator Now its done Radio power installation found Continued page 155 Lower end interpiane struts Diagonal bracing apar rib iooka fiimsy Strut piastic straw roughiy-shapod balsa strip inside Wing hoids place appearance oniy Laminated outline technique fin rudder illustrated right Straight pieces brace outline against warping Rudder pushrod longer ideal because tight rear fuselage Note links use tubing keeper 50 Model Aviation Lower rear fuselage Simple tall skid dowel quite strong Note small brass locknut backing Quick Link Its railroad supplier Looks neat Dont overtighten youll weaken brass coupler fly off pavement consider using wire tall skid run antenna fin top 1116 PLYWOOD TOP WING 1/16 PLYWOOD ING DIHEDRAL BRACES DIHEDRAL- UPPER WING HERE AT EACH TIP BALSATWO STRIPS OF lAB I/B__________________ I/B3/16BASSWOOD3/161/4BALSAFILLPLY UNDERSIDE OF UPPER SPARS TOP 6 BOTTOMLEADING EDGE___________________ 1/16 BALSA SHEET 1/16 BALSA WEBTOPS BOTTOM BOTH 3/4 3/16 BALSA GRAINWINGS TRAILING EDGE R-3 BALSA FILL3/IA 1/4 BALSA LEADING EDGE 1/4 BALSA WITH _____1/64 PLY BACKING N-I N-I\WING STRUT N-S ____ N-Gil1SLOT 3/6 BALSA BALSA F-I R-26-3TRAILING EDGE F-2 B F-3HATCH EDGE I/B A SHEET~i3/43/IRTE -HATCH BASE6-I DIG MWCOT /16 WIDE SLOT WING DETAIL F-43/lA BALSA1/16IN RI AETER ASSEMA SHEETWING NAILS F51A6BALSA I/IA DIG MUSIC I: SHEETWINE CABANE F-6G-V4 3/IA SONOTE U I/IA BALSA SHEET DGUBLFR WITH LIGHTBHG HOLES 3/16 1/2 BALSA I/A 5/16 BALSA GROOVED FOR HATCH EDGE- SEECABANE3/16 50 AA5A F- CROSS SECT I/IA I/B PLY GI/4LONGTO F-4SA7 -- - --- 2 INCIDESCE I/B PLYWOOD OPTIONAL-MOTOR 3/IA SO BALSA UPRIGHT B CROSS PIECES MOTOR MOUNTSHEET ELS-WILLIAMS ELAGE SIDE VIEW /BROS ON DAVE 3/32 DIG MUSE WINEBROWN WHEELS LEAVE THE BOTTOM OF LAST I/IA BALSA SHEET FLUSH WITH OUTER EDGE WING SPAN WING AREA ELECTRIC MOTOR BATTERY PACK PROP SPECIFICATIONS I/N I6 BALSA STRINGER TYPICAL DIHEDRAL LOWER WINGI_ EACH TIP Il/B PLY 0 HEORAL BRACE 3/16 50 BALSA tB 3/16 50 BALSA 3/16 BALSA SHEET STAB 3/IA S/B BALSA 3/IA 1/3 BALSA 3/16 SQ BALSA HINGE TO SUIT C ELEV I/B PLYWOOD 3/32 DIG LANDING GEARMUSIC WINE SEE CONSTRUCTION DETAIL FRONT REAR I/A DIA MUSIC WIRE NOTCH TO GIVE CABANEEPOXY GRIP hPATTERN 0I23456 MODEL AVIATION KRUMPLER DESIGNED BY MARTIN IRVINE 39-I/U 500 55 IN SAC 075 SANYO 7 CELLTRACING BY 30E DEMARCO TAIPAN 5 4 RIGHTS RESERVED 0 0 I0 0 CD 0 CD 2 0 CD -I -L Co 0 0 U World Engines$25-$35 72 MHz NB receivers offered RCD types $6995 Other 27 50 53 72 75 MHz com plete RC service Speed controls chargers repaired P & H $5-$lO Tim Abrens/Aero Electronics 127 Route 6 Box 54J Austin TX 78737 72 MHz transmitters serviced Ace RC Futaba FM sticker$10 AM conversion $15 Alignment plus crystals$40-$5O Other 27 50 75 MHz bands ser viced Custom applications Ni-Cd peak detector chargers P & H $6-$9 Authorized RC Service 128 327 South Stage Coach Lane Fallbrook CA 92028 tel 1-601/728-0440 Open Wed nesday Thursday Friday Saturday 10 am-230 pm 72 MHz transmitters serviced Ace Air tronics Cannon Cox Futaba Hobby Shack Kraft Pro-Line others 72 MHz receivers offered RCD $6995 plus crystal$695 Ace$75$115 P & H $5-$8 Bill Slayton 129 1005 Phillips Drive Dumas TX 79029 E L Lltchfield 130 4707 Woodside Manor Tampa Fl 33624 tel 1-813/8785382 Peter Calvagna 131 1092 Becker School Rd Freeport IL 61032 Thomas Albrlght 132 7303 Stony Hill Rd Wake Forest NC 27587 Krumpler/Irvine Continued page 50 Krumpler threatening end up nose heavy put motor battery aft end hatch Two Y6-sq strips glued bottom hatch spac ing equal width power pack pack rested between Next wire yoke glued rear hatch angled dowel added forward end battery placed between wood strips held place #64 rubberband stretched between yoke dowel first time have used technique works well shall use again makes battery access easy hatch itself held #32 rubberband looped over hatch forward wing dowels Its crude effec tive going use MCR 4A re ceiver add cooling scoops sides nose top hatch will help keep receivers MOSFETs metal oxide-semiconductor field-effect transis torsEd cool efficient kept way Servos mounted far back possi ble put cross sheet /16 below bat tery pack placed receiver initially midsized FMlO7N its battery pack 5R300 mAh between lower wing speed controller Sommerauer Mk 3 25-amp 6- 14-cell unit under motor current-limiting de sign installed fuse under cowling anyway first saw particular arrangement issue newsletter Electric Model Flyers Southern Ontario EMF SO Two Sermos connector housings glued together piece /16 ply tween two small pieces /32 ply AEROMODEL GIANT SHARK ARC PRE-BUILT 0 SHARK $21495 SEE YOUR HOBBY DEALER EIRST SEND STAMPED #10 ENVELOPE POR INFO KINGS WAY RIG HOBBY SUPPLY 5559 RICHMOND HOUSTON TX 77056 DEALERS ONLY 1-800-621-7783 December 1990 155 Sound Supression Oesign High Thrust Efficiency Long Fiber Advanced Composite Material Proven Performance US Masters US Nation als Canadian Nationals World Champion ships Spoits Sizes 57x3 7x3 7x4 7x5 7x6 7x7 7x8 7x9 7x10$159EACH 8x4 8x5 BxB 8x7 8x8 SxS BxlO $179 EACH 9x4 9x5 9x6 9x7 9x8 9x9 9x10 $199 EACH 95x45 10x6 lOx 7 10x8 10x9 lOx 10 $229 EACH 11 xB 11 x7 11 xB 11 x9 12x6 12x7 12x8 ..$289EACH Competition 11 xlO 11 xli 11 x12 11 xl2W 11 x13 11 x14 12x9 12x9W12x10 l2xlOW 12x11 l2xllN 12x 12 12x12N 12x 13 12x13N 12x14 $795 EACH 135 x 125 135 x 14 14 x8 14x 10 14x 12 14x 14 144 x 105 144 x 12 $1295 EACH Contact local hobby dealer Manufactured Landing Products Knights Landing California glued inside housings order put contact under pressure assembly glued A2-in mounting plate turn mounted aircraft nice part about have fused system safety can use arming switch removing replacing fuse Off might want attach fuse airframe short length cord dont lose have used system number models though speed controller limits amperage fully stalled motor fuse doesnt blow al though certainly will control ler Later changed radio Futaba Electric radio MCR 4A receiver dropped weight about four oun ces sneezed Graupner 8 x 4 prop seven 900SCR Ni-Cd cells motor Goldfire now draws over 30 amps according DSC ammeter original current-limiting STW control ler wouldnt pass 26 amps amounts input over 200 wattsor about 100 watts per pound model weight Rocket-propelled biplanes cup tea substituted six-cell l200SC pack dropped peak current freshly charged pack 27 amps 162 watts still potent combination has poop original setup Interestingly requires side thrust before may due fact removal two-ounce speed controller nose aircraft moved CG aft bit made controls little sensitive added air scoops made plastic spoons nose increase airflow over MCR 4As MOSFETs con troller isnt supposed handle current magnitude However have run set seven 900SCRs down just cool ing see photos using Graupner 8 x 4 prop 30-plus amps ini tially shut down after 105 sec let cool got just 15 sec Therefore would guess would have worked air adding scoops much better MOSFETs As now land can feel MOS FETs cool touch remove battery pack have heard people having difficulty radios such shutting down motor too soon being able handle 15 amps Another local flier has similar results both MCR 4A units think troubles other people have must defec tive units some other installation problem complaint radio 50-Hz controller isnt very good fer rite motors time magnets will lose power sounds slightly rough lower throttle settings right applica tion think great little rig Certainly have respect now know what can Its keeper MtCfled Performance system TOP PERFORMANCE K&B ENGINES AirplaneMarine K&B FUELS K&B GLOW PLUGS 9 Blends4 Chsices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B Micro-Bailsons FILLtR K&B SUPER FOXY RESIN K&B THINNER K&B SUPER POXY PRIMER K&P IIPPR pesy PaINT note wiring connectors may order Use good stuff Cheap power systems need best expensive sys tems deserve have standardized con nectors sold Sermos same Anderson Power Poles available Hobby Horn Sermos Jomar SR number other Electric suppliers best avallable Similarly use specialty wire same suppliers youre sure something phone will help out right over phone object using wire minimize losses electrical system Theres no point wasting power dont need cost best especially compared cost airplane very small Covering Any iron-on film market will work well aircraft because strength wing thanks hard wood spars covered entire airframe lightest Coverite Micafilm V ozIyd us ing Balsarite adhesive find clear easier put colored gives airplane clear-doped tissue look also shows off construction rather well provides incentive good work careful adhere covering rib spar extra strength imparts can trim film wish over 156 Model Aviation 555 APCJ APC PROPELLERS CULPEPPEE C MODELS INC 2526 Washington DubuqueIA 52W1 31915334839 Micaflim Assembly Glue wing hold-down dow els rubberband bottom wing position Next slide formed center sec tion struts place Lift out Ae-dia holes fuselage until top wing sits indicated angle inci dence Robart incidence meter works well Remove make sure free surface oil grease notched provide good grip glue Smear slow-setting epoxy drip some holes reassemble Again check angle incidence checking upper lower wing tips same distance apart satisfied let set overnight Now top cross pieces bent bound center section struts soldered Ply wood strips used provide bearing sur faces positive location keying wing glued top wing cut ting away some film ensure ade quate adhesion used quite crude locat ing system because tight schedule building model plan shows abet ter can add some balsa strips simulate scalelike struts make sure wont foul battery hatch wing attachment finished care fully glue stab fin place making sure straight used Sig CA hinges original Williams Bros 2-in wheels used undercarriage About time tail skid can added nonfunctional interplane struts made slightly rounded /t6 balsa inside large plastic drinking straws de signed held place wing ten sion meant come out break before wing damaged case hard landing hitting something Now can balance airplane best procedure try move things around inside necessary achieve cor rect balance rather adding balance weights following summary originals weights 1 oz grams Top wing complete uncovered46 gm Balsarite adhesive3 gm Covered54 gm Covered lettered59 gm Bottom wing 3 grams less Fuselage complete dowels cabane wires landing gear no pushrods wheels cabane cross wiresun covered78 gm Balsarite adhesive2 gm Covered83 gm Stabilizer elevator uncovered 8 gm Coveredil gm Fin rudder uncovered4 gm CoveredS gm Total airframe12 oz Radio weight75 oz later MCR 4A RX35 oz SEE YOUR DEALER OR ORIER DIRECT PLEASE ENTER MY ORDER FORFUEL WJZZARDS AT $ 750 EACh POSTAGE PAID NAMESTREET_______________________ CITYSTATE_______________ ZIP_________ Motor weight connectors prop adapter9 oz Battery weight connectors 7 x 900SCRlO5 oz 6 x 12005CRuS oz Total flying weight STW reg ular radio 7 x 900s39 oz Total flying weight MCR 4A ra dio 6 x 1200s36 oz Flying As stated introduction original Krumpler required Right little Up trim Level flight maintained throttle quick takeoffs aer obatics require full nearly full throttle landing gear fairly far forward have ready correct swing takeoff isnt hard So far have ground looped Krumpler once its test flight before knew much right trim would neces sary takes off less 50 ft no wind less breeze keep flat after breaks ground gain little speed before start pulling much elevator Keep first flight two gentle until have feel airplane Later can throw around rudder throw quite sufficient elevator figure eights very small area Loops fairly straightforward require either nearly-full power lit tle dive first better wind Continued page 162 NOWATWO TAPE SET tape youve waiting finally herell youre new bobby just want learn secret wood plane construction YOU PLANE VIDEO Presents BUILDING IT RIGHT THE FIRST TIME FIRST NO-NONSENSE VIDEO OF WOOD AIRCRAFT CONSTRUCTION APPROX 4 HOURS ON eFuel tank installation eNew engine setup 0 Fuselage construction OBUILDING STRAIGHT C Installing pushrods C Covering film C Eliminating warps e Aligning Salancing C Final checkout ePLUS MUCH MORE! Radio installation Straight wing building Installing hinges C Shear webbing Applying PG cloth S Servo installation Setting up new radio Dozens building tips Slab tall surfaces Aileron installation CREDIT CARD CUSTOMERS Use toll free number place order Have VIS4 MasterCard VISA ready calI.24HR5 DAY OR mail $3495 S & H Iforelge orders add $800 5/H PLANE VIDEO terCaPO Box 23128 Cliv Iowa 50325 Iowa residents add 4%sales tax PLAN vicevanG1Ou1LO 7 fliuvYti FREEI800I 38382 5VTOLL FREE 24HR24HR OR 5151223-0897 December 1990 157 FUEL WIZZARD THE WORLDS FASTEST AND MOST CONVENIENT FUEL PUMP EVER * FITS ALL GALLON FUEL BOTTLES * FAST ONE STROKE LL OUNCE OF FUEL * ALL FUEL SAFE GLO FUEL & GASOLINE SUGGESTED RETAIL $995 NOW JUST $750 ORDER FROM ACME PLASTIC PUMP CO P 0 BOX 24551 MINNEAPOLIS MN 55424 DEALER INQUIRIES INVITE) FILLS THE LARGEST MODEL FUEL TANKS IN SECONDS Krumpler/Irvine Continued page 157 loops deteriorating plane falling off top battery running down its time pian landing Spins require CG further back whit used initially removal two-ounce speed controller nose can get spin little power just top stall needs blast air across tail get going Stall turns easy Just go power push stick over Snap rolls level flight just easy Feed little Up elevator just see nose start rise pull stick right over full back zips right around actually pauses level flight before going spiral dive pause cue let go stick can make way down length field snapping 10 20 yards stall turn other end repeat comine other way glide moderate remember bi planes draggy better struts Nevertheless find biplane struts mildly offensive usually have Make first few approaches bat tery power left have option going around rumbling generally fly until detect slight drop power cut throttle come just last little bit reserve SCR cells have sharp discharge knee almost like running out fuel whereas SCs give about 30second warning airplane best calm weather steady breeze 1989 KRC Fun Fly quite windy varied constant fine Krumpler gusty flyable much fun best time have far has evening flying wind has dropped THE WIREMASTER TM bessderutcolter extra large handle bends 1/8-1/4 coils S/ 32-3116 music wire Wlre peep eliminated ANTI-KREEP WIRE LOCKTh free catalog also has hardware accessories JOM COMPANY 114 Washfrlgton T Dept Waukegan IL 60095 can shoot touch-and-go after another admiring set ting sun shines through covering put skis winter flying put Goldfire Flying qualities deterior ated slightly because extra drag weight skis nothing major Conclusion What might change sec ond Krumpler might shorten nose bit build straight wings ease ten dency towards nose-heaviness might turn something else air Krumpler has bit Tiger Moth itand little Bucker Jungmann well creative modeler might take few minor changes create nice small Scale Electric last point build Krum pler please send comments photo Martin Irvine 34 Beaver Crescent Kingston Ontario Canada K7M 7C 1 will answer correspondence would appreciate sending stamp RC Helicopters/Jolly Continued page 52 Concept 30 SX complete highperformance package expert fliers Kit Concept 30 SX arrived nicely packaged gold box vividly displaying SXs sleek lines lid slid off parts exposed evident Concept 30 SX pure Kyosho kit features excellent quality obvious thought put part SX shipped standard Concept struction manual two separate addendum sheets pertain specifically SX Kyosho understands multinational necessity clear pictures result manuals feature ex cellent illustrations just enough text take over rough spots standard Concept manual over 30 pages super piece work Anyone can build Concept merely looking pictures matching parts fas teners Concept 30 SX difficult assemble Following instructions letter took under seven hours start finish Youll have no problems Ill expand just briefly few steps feel may lacking text Step 11 Set clutch lining place glue thin CyA add glue first youll tiAWIUKUUKKILANE RAF WAS GLAD TO H4 YE t SPITFIRE RIJTITIA4D TO HAVE T pSIS 00 01501 Add Si 500 hEFIa Usa VISAs MC 015151050 015 COO Polyester HaM Laid Fibealaaa1/aS Soale Fuselage ngspan.50 noVas lete eels aod llardwaeFuse LengTh. 0353 lncttea Paclsages IndudadWeight.12 Lbs Meotrina Cut Foam Adog Cares Fonssr.2oy5OTs 108 Any 125 / Heavy Duty Styiene Clam Canopy1mm Legal / Flbertleas Cowl Fuse H Molded Stringers Easy RuildEsay Fly Esoellent Beginnem Waibjid SoossassIss AesHaWe 55550 reps s sed Fplns trawsa SeataTkea8t5jbs55alieht0tats IR5m5 5 LRta 054 Las 0th /S KIt AeettRhe Wue isa. a WutS leSs 750*5 Pes.ZeyW Ta toe Aan tss Jte Pun 551 a. P5351 P P-a ME-flOsS Nasmyx 1LU3Mesa Ms5oTan8 ml P5133 035331 l-amoaavImn never get lining belongs before sticks itself tableyou get pic ture step 13 main frame assembly call out 2 x 3 x 10mm-long self-tapping screws illustration shows could shorter hold cooling shroud place fact screws too long will bind up clutch bell step 19 tail rotor assembly make sure use plastic-compatible screw cement supplied kit good job tightening pitch ring nut slide bushing assembly could better designed allow positive grip during assembly would help ensure nut will separate bushing dur ing use step 21 dont glue new control rod sup ports place Instead decide go apply -in strip vinyl electrical trim tape boom Rub edges tape down well slide supports position twisting motion Youll find fit snugly removable can also put some tape boom under horizontal stabilizer help snug up step 31 installation canopy should use additional two screws front lower sides canopy keep decals lifting canopy front edge Id like add suggestions just no way intended detract Concept manual excellent build ing aid kit complete Concept yos would literally have try fail keep achieving success What radio Concept SX used Air tronics Vanguard six-channel FM system SGX gyro transmitter features dual rates elevator aileron has idle up setting pitch trim revolution mix throttle hold servo reversing switches todays standards Vanguard rates very basic heli system Unlike PCM 10 1024 hell pilots will able use everything Vanguard-type sys tem Its perfect beginner will per form contest system Novice Scale maybe far Intermediate since can per form upright maneuvers SGX system comes gyro mixer dedicated tail rotor servo features single adjustable gain reversing switch FAt caliber its perfect novice will want set gain up high authority adjust gyro suit taste pro gresses SGX will also find favor fixedwing tail-dragger pilots think its just ticket short-coupled Scale ship gets fe isty takeoff Check out couldnt easier install Vanguard performed admirably glitch think however suitable training SX will capable everything expert will want SX mind switched over Air tronics Spectra 7 PCM radio still pre microprocessor has enough bells whis tles allow competent pilot explore SXs inverted capabilities motivator power used standard 05 32 FSR H coupled Vortexs Eikohgiken C 30 muffler What can say about start idle produce lot powerall good things want heli motor C 30 seems help out power department has added advantage allowing adjust low idle mixture motor once course 162 Model Aviation Rubber ft Ongine Power Free Flight Display Control Line Eleotric Power RIC Airplenee new liluetrated 32 page tabloId size catalog US ft Canade $100 Foreigh $300 Penn Valley Hobby Center 837-A W Main St Lanadale PA 18446 215 368-0770 ZENOAH SACHS-DOLMAR & QUADRA ENGINES ERCOUPE TOMAHAWK & J-3 KITIEN KITS ZINGER & DYNATHRUST PROPS FUEL TANKS Carbon-Fiber Arrowahafte Ceconite & Glue DGA & MGA PILOTS Send $100 catalog JIM MESSERS QUALITY MODEL PRODUCTS Valley View Dr Box 43 Allegany NY 14706
Edition: Model Aviation - 1990/12
Page Numbers: 46, 47, 48, 49, 50, 51, 155, 156, 157, 162
NO OCR TEXT 1_ _ - iI-4La{ ______ tric-powered biplane looks like might actually have post-WW full-scale plane early homebuiltbut its Its entirely original design Build lot easy sport flying EMartin Irvine TWO WEEKS before 10th Annual KRC Electric Fun Fly found myself needing new airplane love NW biplanes course everyone knows Electric bipes require too much power overcome drag truly practical obvi ously have never seen Keith Shaws 60-size Stearman decided kept fuse lage fairly small number struts minimum should OKa nice slow flier What banged together two weeks what see test flew sun going down Friday September 15 11 hours before leave KRC meet Id like say flew right off board design ers have admit required three-fourths Right rudder two clicks Up elevator trim before flew straight Big deal thought amount rudder re quired because lack right thrust motor Small bipes often require sideand down-thrust haste forgot side-thrust tried model still required some right trim cant see warps anyway dont mind small amount trim down-thrust built way wing incidence 20 30 top bottom wings respectively sta bilizer incidence 2 O causes air plane fly slight downward angle ef fectively giving down-thrust flew number flights KRC meet terrific weekend anyone inter ested Electrics should attend least once got requests plans five people made think might have wider appeal article re sult specification table will tell what might want know about Krumpler just couple ad ditional notes needed first used DSC 075 motor sim ilar 075/550-size motors current generation complete kit Electric trainers sport planes bat tery pack Sanyo seven-cell 9005CR pack prop used Taipan 8 x 4 combination motor draws 19 amps calculates total power put 130 watts think airplane needs seven-cell pack use 550-type motor want reliable takeoffs grass Although can done six cells marginal much fun remotored Great Planes Goldfire motor has much poop usual 550 course ex pense much higher current over 30 amps current-limiting STW speed con troller wouldnt let 26 amps get through flight times short absurd tried Futaba MCR 4A re ceiver great success able use six-cell packs am getting ahead myself Lets build first Construction Wings make plywood master rib cut ribs sharp No11 blade center section ribs just trim A6 off top bottom surfaces Decide what size spars want make spar cut outs suit used /8 x /16 basswood spars rather uncommon sizeso might use /8 x bass spruce Don t use balsa spars wont strong weight saving would negligible Use medium weight straight-grained balsa rest wing dihedral brace ply goes between spars does shear webbing Dont leave webbing out weighs little adds lot stren2th can build either top lower wing first will constructed panel time Start laying down lower spar trailing edge Place ribs position angling root rib bit dihe dral add top spar dry ie no glue Eyeball everything assure straight use thin CyA glue things solid Add leading edge being careful shim up lined up top bottom ribs Glue wing tip pieces add vertically grained shear webbing between spars braced trailing edge gussets Now build other wing panel youre finished cut slot root ribs dihedral brace December 1990 47 No havent just landed underside view shows slight wing sweep generous tail mo ment translucent covering Barely visible fuse mount ahead lower wing cen ter section Bottom hatch Balsa rails keep motor pack seven 900SCRs centered Note wire yoke rear No 64 elastic 3A-ln dowel acts forward battery hold-down point Everythings mounted hatch base Yoke held CyA has stood some unexpected arrivals four notches sides clear cabane struts Join two halves epoxy have time make adjustments suring have correct dihedral inch side top wing 1 /2 side bottom wing Next A-in center section trailing edge piece can shaped added can leading edge A-in piece Glue center section sheet Keep mind spars flush covering dont sheet over strut fittings made A-in sheet notched interplane struts backed / ply just buttglued side ribs strong enough struts weaker wing structure will knock out break before damaging wing experience speaks Brace rear fitting %-in sq flush covering surface other wing built exactly same way Tail The stabilizer needs no explanation fin rudder built using old Free Flight technique called laminating Its easy strong looks great First cut A-in balsa blank form inside line fin rudder Dont bother wax anything Next cut seven strips soft A2 x x 24in balsa additional strip little wider Pin form down surface covered waxed paper Stack strips together using pins hold things place wrap around form slightly wider strip should inside next form use little tension pull ing strips around will find dry wood bends quite easily Once strips pinned place push laminations down flush build ing surface Now use thin CyA glue everything solid being careful get glue form slightly wider piece placed against form acts dam stop CyA sticking lam inations form Once glue has set unpin outline tum over CyA other side stack has set gently spring outline open will quickly see lam inations need glue Now thumbtack sheet fine sandpaper 48 Model Aviation Lower wing cutout radio bay has enough room lot Two 51338 right receiver battery pack sit middle Note mounted balsa floor grain across fuselage Minimal foam needed because lack vibra tion some should used protection rough landings fuselage holder on/off switch ahead wIng Construction wing outlined article Top view nose sans hatch Note side thrust DSC 075 motor Looks snug everything fits fairly easily bottom STW Sommeraur MK3 speed controller motor/controller connectors top Loose set connectors battery pack tached underside hatch XLR *8RL w/PLS I9ARTJNIRVINE 4 BRLRRj8& g Q8EL&R 6LFU- x -4 tic WfRE 4 8nL~ \\ Q N Cl 16 o5Q B l-OMERcN8 075 M0rc N 11~~~ 0 0fif i 0ji~MRIRVJNE 0 fl-VINe 51YI 0 TW PLANL OL BUDDr5HEFT IA UC NOj- VNCflcJLRUT INSIDE NDRINJNG S7Rflh ToPUJ1Io~JTH WIN& N 4BAL8R&HErT Q Q TE flat surface carefully sand out line smooth find works best hold under extended fingers sand cir cular motion Once reasonably smooth pin plan add other pieces trimming outline leave leading edge little long can act key rear fuselage upper surface Now can cut rudder free think will pleasantly surprised strong structure Fuselage Construct both basic sides 3/ square sheet best second side constructed over first small pieces wax paper glue joints pre vent two sides sticking together Note right side shorter left give built-in side thrust cabane struts will glued slotted balsa pieces fuselage Dry fit pieces groove accept 1/16 spring steel cabane wires before glu ing place Make sure slots inside surface fuselage Groove upper longerons accept cabanes add A6 sheet doubler inside both sides Note does run full length nose stops short motor bulkhead provide slot its insertion later Fill ward two bays /16 sheet Now add / x 3A6-in strips tail end let A6 sheet outside edge course time being care ful build right left sidearent assemble basic fuselage put gether upside down forward upper longerons flat against building board temporary Y6-in -sq crosspiece forward cabane mount permanent ones rear battery hatch leading trailing edges wing Now have basic box should square angles Check redo necessary cant expect plane fly straight looks like should have Chi quita painted side Once straight pull forward fuse lage together install motor bulk head Next draw rear fuselage together tail join checking straight ness Add remaining /l6 cross pieces Next bend landing gear sew landing gear bulkhead wire Spread epoxy glue over sewn joint glue assembly position fuselage doing might want temporarily attach lower wing check level rear fuselage has piece A-in sheet set between upper rear longe rons act base fin left leading edge fin little long can cut slot forward edge piece accept Dont add tail skid yet easier after have cov ered fuselage Now can add rear turtledeck form ers Cut slot center A6 x A-in stringer top center former Ad just things until stringer straight level glue place Next using straightedge very sharp blade cut slots other two stringers side equidistant center stringer upper longeron three stringers end up being flush last crosspiece just ahead fin Add diagonal bracing top bottom first add side bracing lower cowl sheeting should added yet Now get hatch Hold piece A-in sheet top trace along inside upper longerons Cut A-in sheet out leaving line Next carefully break out temporary crosspiece glued across forward center section struts landing gear bulkhead helps hold sides apart now Carefully sand hatch base until snug tight fit Glue formers place add sheeting two halves front back Now add side pieces easier add after adding sheeting before Trim cockpit outline notch sides cabane struts Add lower cowling A6 sheet wing dowels bits pieces nose Round off make nose look little like radiator Now its done Radio power installation found Continued page 155 Lower end interpiane struts Diagonal bracing apar rib iooka fiimsy Strut piastic straw roughiy-shapod balsa strip inside Wing hoids place appearance oniy Laminated outline technique fin rudder illustrated right Straight pieces brace outline against warping Rudder pushrod longer ideal because tight rear fuselage Note links use tubing keeper 50 Model Aviation Lower rear fuselage Simple tall skid dowel quite strong Note small brass locknut backing Quick Link Its railroad supplier Looks neat Dont overtighten youll weaken brass coupler fly off pavement consider using wire tall skid run antenna fin top 1116 PLYWOOD TOP WING 1/16 PLYWOOD ING DIHEDRAL BRACES DIHEDRAL- UPPER WING HERE AT EACH TIP BALSATWO STRIPS OF lAB I/B__________________ I/B3/16BASSWOOD3/161/4BALSAFILLPLY UNDERSIDE OF UPPER SPARS TOP 6 BOTTOMLEADING EDGE___________________ 1/16 BALSA SHEET 1/16 BALSA WEBTOPS BOTTOM BOTH 3/4 3/16 BALSA GRAINWINGS TRAILING EDGE R-3 BALSA FILL3/IA 1/4 BALSA LEADING EDGE 1/4 BALSA WITH _____1/64 PLY BACKING N-I N-I\WING STRUT N-S ____ N-Gil1SLOT 3/6 BALSA BALSA F-I R-26-3TRAILING EDGE F-2 B F-3HATCH EDGE I/B A SHEET~i3/43/IRTE -HATCH BASE6-I DIG MWCOT /16 WIDE SLOT WING DETAIL F-43/lA BALSA1/16IN RI AETER ASSEMA SHEETWING NAILS F51A6BALSA I/IA DIG MUSIC I: SHEETWINE CABANE F-6G-V4 3/IA SONOTE U I/IA BALSA SHEET DGUBLFR WITH LIGHTBHG HOLES 3/16 1/2 BALSA I/A 5/16 BALSA GROOVED FOR HATCH EDGE- SEECABANE3/16 50 AA5A F- CROSS SECT I/IA I/B PLY GI/4LONGTO F-4SA7 -- - --- 2 INCIDESCE I/B PLYWOOD OPTIONAL-MOTOR 3/IA SO BALSA UPRIGHT B CROSS PIECES MOTOR MOUNTSHEET ELS-WILLIAMS ELAGE SIDE VIEW /BROS ON DAVE 3/32 DIG MUSE WINEBROWN WHEELS LEAVE THE BOTTOM OF LAST I/IA BALSA SHEET FLUSH WITH OUTER EDGE WING SPAN WING AREA ELECTRIC MOTOR BATTERY PACK PROP SPECIFICATIONS I/N I6 BALSA STRINGER TYPICAL DIHEDRAL LOWER WINGI_ EACH TIP Il/B PLY 0 HEORAL BRACE 3/16 50 BALSA tB 3/16 50 BALSA 3/16 BALSA SHEET STAB 3/IA S/B BALSA 3/IA 1/3 BALSA 3/16 SQ BALSA HINGE TO SUIT C ELEV I/B PLYWOOD 3/32 DIG LANDING GEARMUSIC WINE SEE CONSTRUCTION DETAIL FRONT REAR I/A DIA MUSIC WIRE NOTCH TO GIVE CABANEEPOXY GRIP hPATTERN 0I23456 MODEL AVIATION KRUMPLER DESIGNED BY MARTIN IRVINE 39-I/U 500 55 IN SAC 075 SANYO 7 CELLTRACING BY 30E DEMARCO TAIPAN 5 4 RIGHTS RESERVED 0 0 I0 0 CD 0 CD 2 0 CD -I -L Co 0 0 U World Engines$25-$35 72 MHz NB receivers offered RCD types $6995 Other 27 50 53 72 75 MHz com plete RC service Speed controls chargers repaired P & H $5-$lO Tim Abrens/Aero Electronics 127 Route 6 Box 54J Austin TX 78737 72 MHz transmitters serviced Ace RC Futaba FM sticker$10 AM conversion $15 Alignment plus crystals$40-$5O Other 27 50 75 MHz bands ser viced Custom applications Ni-Cd peak detector chargers P & H $6-$9 Authorized RC Service 128 327 South Stage Coach Lane Fallbrook CA 92028 tel 1-601/728-0440 Open Wed nesday Thursday Friday Saturday 10 am-230 pm 72 MHz transmitters serviced Ace Air tronics Cannon Cox Futaba Hobby Shack Kraft Pro-Line others 72 MHz receivers offered RCD $6995 plus crystal$695 Ace$75$115 P & H $5-$8 Bill Slayton 129 1005 Phillips Drive Dumas TX 79029 E L Lltchfield 130 4707 Woodside Manor Tampa Fl 33624 tel 1-813/8785382 Peter Calvagna 131 1092 Becker School Rd Freeport IL 61032 Thomas Albrlght 132 7303 Stony Hill Rd Wake Forest NC 27587 Krumpler/Irvine Continued page 50 Krumpler threatening end up nose heavy put motor battery aft end hatch Two Y6-sq strips glued bottom hatch spac ing equal width power pack pack rested between Next wire yoke glued rear hatch angled dowel added forward end battery placed between wood strips held place #64 rubberband stretched between yoke dowel first time have used technique works well shall use again makes battery access easy hatch itself held #32 rubberband looped over hatch forward wing dowels Its crude effec tive going use MCR 4A re ceiver add cooling scoops sides nose top hatch will help keep receivers MOSFETs metal oxide-semiconductor field-effect transis torsEd cool efficient kept way Servos mounted far back possi ble put cross sheet /16 below bat tery pack placed receiver initially midsized FMlO7N its battery pack 5R300 mAh between lower wing speed controller Sommerauer Mk 3 25-amp 6- 14-cell unit under motor current-limiting de sign installed fuse under cowling anyway first saw particular arrangement issue newsletter Electric Model Flyers Southern Ontario EMF SO Two Sermos connector housings glued together piece /16 ply tween two small pieces /32 ply AEROMODEL GIANT SHARK ARC PRE-BUILT 0 SHARK $21495 SEE YOUR HOBBY DEALER EIRST SEND STAMPED #10 ENVELOPE POR INFO KINGS WAY RIG HOBBY SUPPLY 5559 RICHMOND HOUSTON TX 77056 DEALERS ONLY 1-800-621-7783 December 1990 155 Sound Supression Oesign High Thrust Efficiency Long Fiber Advanced Composite Material Proven Performance US Masters US Nation als Canadian Nationals World Champion ships Spoits Sizes 57x3 7x3 7x4 7x5 7x6 7x7 7x8 7x9 7x10$159EACH 8x4 8x5 BxB 8x7 8x8 SxS BxlO $179 EACH 9x4 9x5 9x6 9x7 9x8 9x9 9x10 $199 EACH 95x45 10x6 lOx 7 10x8 10x9 lOx 10 $229 EACH 11 xB 11 x7 11 xB 11 x9 12x6 12x7 12x8 ..$289EACH Competition 11 xlO 11 xli 11 x12 11 xl2W 11 x13 11 x14 12x9 12x9W12x10 l2xlOW 12x11 l2xllN 12x 12 12x12N 12x 13 12x13N 12x14 $795 EACH 135 x 125 135 x 14 14 x8 14x 10 14x 12 14x 14 144 x 105 144 x 12 $1295 EACH Contact local hobby dealer Manufactured Landing Products Knights Landing California glued inside housings order put contact under pressure assembly glued A2-in mounting plate turn mounted aircraft nice part about have fused system safety can use arming switch removing replacing fuse Off might want attach fuse airframe short length cord dont lose have used system number models though speed controller limits amperage fully stalled motor fuse doesnt blow al though certainly will control ler Later changed radio Futaba Electric radio MCR 4A receiver dropped weight about four oun ces sneezed Graupner 8 x 4 prop seven 900SCR Ni-Cd cells motor Goldfire now draws over 30 amps according DSC ammeter original current-limiting STW control ler wouldnt pass 26 amps amounts input over 200 wattsor about 100 watts per pound model weight Rocket-propelled biplanes cup tea substituted six-cell l200SC pack dropped peak current freshly charged pack 27 amps 162 watts still potent combination has poop original setup Interestingly requires side thrust before may due fact removal two-ounce speed controller nose aircraft moved CG aft bit made controls little sensitive added air scoops made plastic spoons nose increase airflow over MCR 4As MOSFETs con troller isnt supposed handle current magnitude However have run set seven 900SCRs down just cool ing see photos using Graupner 8 x 4 prop 30-plus amps ini tially shut down after 105 sec let cool got just 15 sec Therefore would guess would have worked air adding scoops much better MOSFETs As now land can feel MOS FETs cool touch remove battery pack have heard people having difficulty radios such shutting down motor too soon being able handle 15 amps Another local flier has similar results both MCR 4A units think troubles other people have must defec tive units some other installation problem complaint radio 50-Hz controller isnt very good fer rite motors time magnets will lose power sounds slightly rough lower throttle settings right applica tion think great little rig Certainly have respect now know what can Its keeper MtCfled Performance system TOP PERFORMANCE K&B ENGINES AirplaneMarine K&B FUELS K&B GLOW PLUGS 9 Blends4 Chsices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B Micro-Bailsons FILLtR K&B SUPER FOXY RESIN K&B THINNER K&B SUPER POXY PRIMER K&P IIPPR pesy PaINT note wiring connectors may order Use good stuff Cheap power systems need best expensive sys tems deserve have standardized con nectors sold Sermos same Anderson Power Poles available Hobby Horn Sermos Jomar SR number other Electric suppliers best avallable Similarly use specialty wire same suppliers youre sure something phone will help out right over phone object using wire minimize losses electrical system Theres no point wasting power dont need cost best especially compared cost airplane very small Covering Any iron-on film market will work well aircraft because strength wing thanks hard wood spars covered entire airframe lightest Coverite Micafilm V ozIyd us ing Balsarite adhesive find clear easier put colored gives airplane clear-doped tissue look also shows off construction rather well provides incentive good work careful adhere covering rib spar extra strength imparts can trim film wish over 156 Model Aviation 555 APCJ APC PROPELLERS CULPEPPEE C MODELS INC 2526 Washington DubuqueIA 52W1 31915334839 Micaflim Assembly Glue wing hold-down dow els rubberband bottom wing position Next slide formed center sec tion struts place Lift out Ae-dia holes fuselage until top wing sits indicated angle inci dence Robart incidence meter works well Remove make sure free surface oil grease notched provide good grip glue Smear slow-setting epoxy drip some holes reassemble Again check angle incidence checking upper lower wing tips same distance apart satisfied let set overnight Now top cross pieces bent bound center section struts soldered Ply wood strips used provide bearing sur faces positive location keying wing glued top wing cut ting away some film ensure ade quate adhesion used quite crude locat ing system because tight schedule building model plan shows abet ter can add some balsa strips simulate scalelike struts make sure wont foul battery hatch wing attachment finished care fully glue stab fin place making sure straight used Sig CA hinges original Williams Bros 2-in wheels used undercarriage About time tail skid can added nonfunctional interplane struts made slightly rounded /t6 balsa inside large plastic drinking straws de signed held place wing ten sion meant come out break before wing damaged case hard landing hitting something Now can balance airplane best procedure try move things around inside necessary achieve cor rect balance rather adding balance weights following summary originals weights 1 oz grams Top wing complete uncovered46 gm Balsarite adhesive3 gm Covered54 gm Covered lettered59 gm Bottom wing 3 grams less Fuselage complete dowels cabane wires landing gear no pushrods wheels cabane cross wiresun covered78 gm Balsarite adhesive2 gm Covered83 gm Stabilizer elevator uncovered 8 gm Coveredil gm Fin rudder uncovered4 gm CoveredS gm Total airframe12 oz Radio weight75 oz later MCR 4A RX35 oz SEE YOUR DEALER OR ORIER DIRECT PLEASE ENTER MY ORDER FORFUEL WJZZARDS AT $ 750 EACh POSTAGE PAID NAMESTREET_______________________ CITYSTATE_______________ ZIP_________ Motor weight connectors prop adapter9 oz Battery weight connectors 7 x 900SCRlO5 oz 6 x 12005CRuS oz Total flying weight STW reg ular radio 7 x 900s39 oz Total flying weight MCR 4A ra dio 6 x 1200s36 oz Flying As stated introduction original Krumpler required Right little Up trim Level flight maintained throttle quick takeoffs aer obatics require full nearly full throttle landing gear fairly far forward have ready correct swing takeoff isnt hard So far have ground looped Krumpler once its test flight before knew much right trim would neces sary takes off less 50 ft no wind less breeze keep flat after breaks ground gain little speed before start pulling much elevator Keep first flight two gentle until have feel airplane Later can throw around rudder throw quite sufficient elevator figure eights very small area Loops fairly straightforward require either nearly-full power lit tle dive first better wind Continued page 162 NOWATWO TAPE SET tape youve waiting finally herell youre new bobby just want learn secret wood plane construction YOU PLANE VIDEO Presents BUILDING IT RIGHT THE FIRST TIME FIRST NO-NONSENSE VIDEO OF WOOD AIRCRAFT CONSTRUCTION APPROX 4 HOURS ON eFuel tank installation eNew engine setup 0 Fuselage construction OBUILDING STRAIGHT C Installing pushrods C Covering film C Eliminating warps e Aligning Salancing C Final checkout ePLUS MUCH MORE! Radio installation Straight wing building Installing hinges C Shear webbing Applying PG cloth S Servo installation Setting up new radio Dozens building tips Slab tall surfaces Aileron installation CREDIT CARD CUSTOMERS Use toll free number place order Have VIS4 MasterCard VISA ready calI.24HR5 DAY OR mail $3495 S & H Iforelge orders add $800 5/H PLANE VIDEO terCaPO Box 23128 Cliv Iowa 50325 Iowa residents add 4%sales tax PLAN vicevanG1Ou1LO 7 fliuvYti FREEI800I 38382 5VTOLL FREE 24HR24HR OR 5151223-0897 December 1990 157 FUEL WIZZARD THE WORLDS FASTEST AND MOST CONVENIENT FUEL PUMP EVER * FITS ALL GALLON FUEL BOTTLES * FAST ONE STROKE LL OUNCE OF FUEL * ALL FUEL SAFE GLO FUEL & GASOLINE SUGGESTED RETAIL $995 NOW JUST $750 ORDER FROM ACME PLASTIC PUMP CO P 0 BOX 24551 MINNEAPOLIS MN 55424 DEALER INQUIRIES INVITE) FILLS THE LARGEST MODEL FUEL TANKS IN SECONDS Krumpler/Irvine Continued page 157 loops deteriorating plane falling off top battery running down its time pian landing Spins require CG further back whit used initially removal two-ounce speed controller nose can get spin little power just top stall needs blast air across tail get going Stall turns easy Just go power push stick over Snap rolls level flight just easy Feed little Up elevator just see nose start rise pull stick right over full back zips right around actually pauses level flight before going spiral dive pause cue let go stick can make way down length field snapping 10 20 yards stall turn other end repeat comine other way glide moderate remember bi planes draggy better struts Nevertheless find biplane struts mildly offensive usually have Make first few approaches bat tery power left have option going around rumbling generally fly until detect slight drop power cut throttle come just last little bit reserve SCR cells have sharp discharge knee almost like running out fuel whereas SCs give about 30second warning airplane best calm weather steady breeze 1989 KRC Fun Fly quite windy varied constant fine Krumpler gusty flyable much fun best time have far has evening flying wind has dropped THE WIREMASTER TM bessderutcolter extra large handle bends 1/8-1/4 coils S/ 32-3116 music wire Wlre peep eliminated ANTI-KREEP WIRE LOCKTh free catalog also has hardware accessories JOM COMPANY 114 Washfrlgton T Dept Waukegan IL 60095 can shoot touch-and-go after another admiring set ting sun shines through covering put skis winter flying put Goldfire Flying qualities deterior ated slightly because extra drag weight skis nothing major Conclusion What might change sec ond Krumpler might shorten nose bit build straight wings ease ten dency towards nose-heaviness might turn something else air Krumpler has bit Tiger Moth itand little Bucker Jungmann well creative modeler might take few minor changes create nice small Scale Electric last point build Krum pler please send comments photo Martin Irvine 34 Beaver Crescent Kingston Ontario Canada K7M 7C 1 will answer correspondence would appreciate sending stamp RC Helicopters/Jolly Continued page 52 Concept 30 SX complete highperformance package expert fliers Kit Concept 30 SX arrived nicely packaged gold box vividly displaying SXs sleek lines lid slid off parts exposed evident Concept 30 SX pure Kyosho kit features excellent quality obvious thought put part SX shipped standard Concept struction manual two separate addendum sheets pertain specifically SX Kyosho understands multinational necessity clear pictures result manuals feature ex cellent illustrations just enough text take over rough spots standard Concept manual over 30 pages super piece work Anyone can build Concept merely looking pictures matching parts fas teners Concept 30 SX difficult assemble Following instructions letter took under seven hours start finish Youll have no problems Ill expand just briefly few steps feel may lacking text Step 11 Set clutch lining place glue thin CyA add glue first youll tiAWIUKUUKKILANE RAF WAS GLAD TO H4 YE t SPITFIRE RIJTITIA4D TO HAVE T pSIS 00 01501 Add Si 500 hEFIa Usa VISAs MC 015151050 015 COO Polyester HaM Laid Fibealaaa1/aS Soale Fuselage ngspan.50 noVas lete eels aod llardwaeFuse LengTh. 0353 lncttea Paclsages IndudadWeight.12 Lbs Meotrina Cut Foam Adog Cares Fonssr.2oy5OTs 108 Any 125 / Heavy Duty Styiene Clam Canopy1mm Legal / Flbertleas Cowl Fuse H Molded Stringers Easy RuildEsay Fly Esoellent Beginnem Waibjid SoossassIss AesHaWe 55550 reps s sed Fplns trawsa SeataTkea8t5jbs55alieht0tats IR5m5 5 LRta 054 Las 0th /S KIt AeettRhe Wue isa. a WutS leSs 750*5 Pes.ZeyW Ta toe Aan tss Jte Pun 551 a. P5351 P P-a ME-flOsS Nasmyx 1LU3Mesa Ms5oTan8 ml P5133 035331 l-amoaavImn never get lining belongs before sticks itself tableyou get pic ture step 13 main frame assembly call out 2 x 3 x 10mm-long self-tapping screws illustration shows could shorter hold cooling shroud place fact screws too long will bind up clutch bell step 19 tail rotor assembly make sure use plastic-compatible screw cement supplied kit good job tightening pitch ring nut slide bushing assembly could better designed allow positive grip during assembly would help ensure nut will separate bushing dur ing use step 21 dont glue new control rod sup ports place Instead decide go apply -in strip vinyl electrical trim tape boom Rub edges tape down well slide supports position twisting motion Youll find fit snugly removable can also put some tape boom under horizontal stabilizer help snug up step 31 installation canopy should use additional two screws front lower sides canopy keep decals lifting canopy front edge Id like add suggestions just no way intended detract Concept manual excellent build ing aid kit complete Concept yos would literally have try fail keep achieving success What radio Concept SX used Air tronics Vanguard six-channel FM system SGX gyro transmitter features dual rates elevator aileron has idle up setting pitch trim revolution mix throttle hold servo reversing switches todays standards Vanguard rates very basic heli system Unlike PCM 10 1024 hell pilots will able use everything Vanguard-type sys tem Its perfect beginner will per form contest system Novice Scale maybe far Intermediate since can per form upright maneuvers SGX system comes gyro mixer dedicated tail rotor servo features single adjustable gain reversing switch FAt caliber its perfect novice will want set gain up high authority adjust gyro suit taste pro gresses SGX will also find favor fixedwing tail-dragger pilots think its just ticket short-coupled Scale ship gets fe isty takeoff Check out couldnt easier install Vanguard performed admirably glitch think however suitable training SX will capable everything expert will want SX mind switched over Air tronics Spectra 7 PCM radio still pre microprocessor has enough bells whis tles allow competent pilot explore SXs inverted capabilities motivator power used standard 05 32 FSR H coupled Vortexs Eikohgiken C 30 muffler What can say about start idle produce lot powerall good things want heli motor C 30 seems help out power department has added advantage allowing adjust low idle mixture motor once course 162 Model Aviation Rubber ft Ongine Power Free Flight Display Control Line Eleotric Power RIC Airplenee new liluetrated 32 page tabloId size catalog US ft Canade $100 Foreigh $300 Penn Valley Hobby Center 837-A W Main St Lanadale PA 18446 215 368-0770 ZENOAH SACHS-DOLMAR & QUADRA ENGINES ERCOUPE TOMAHAWK & J-3 KITIEN KITS ZINGER & DYNATHRUST PROPS FUEL TANKS Carbon-Fiber Arrowahafte Ceconite & Glue DGA & MGA PILOTS Send $100 catalog JIM MESSERS QUALITY MODEL PRODUCTS Valley View Dr Box 43 Allegany NY 14706
Edition: Model Aviation - 1990/12
Page Numbers: 46, 47, 48, 49, 50, 51, 155, 156, 157, 162
NO OCR TEXT 1_ _ - iI-4La{ ______ tric-powered biplane looks like might actually have post-WW full-scale plane early homebuiltbut its Its entirely original design Build lot easy sport flying EMartin Irvine TWO WEEKS before 10th Annual KRC Electric Fun Fly found myself needing new airplane love NW biplanes course everyone knows Electric bipes require too much power overcome drag truly practical obvi ously have never seen Keith Shaws 60-size Stearman decided kept fuse lage fairly small number struts minimum should OKa nice slow flier What banged together two weeks what see test flew sun going down Friday September 15 11 hours before leave KRC meet Id like say flew right off board design ers have admit required three-fourths Right rudder two clicks Up elevator trim before flew straight Big deal thought amount rudder re quired because lack right thrust motor Small bipes often require sideand down-thrust haste forgot side-thrust tried model still required some right trim cant see warps anyway dont mind small amount trim down-thrust built way wing incidence 20 30 top bottom wings respectively sta bilizer incidence 2 O causes air plane fly slight downward angle ef fectively giving down-thrust flew number flights KRC meet terrific weekend anyone inter ested Electrics should attend least once got requests plans five people made think might have wider appeal article re sult specification table will tell what might want know about Krumpler just couple ad ditional notes needed first used DSC 075 motor sim ilar 075/550-size motors current generation complete kit Electric trainers sport planes bat tery pack Sanyo seven-cell 9005CR pack prop used Taipan 8 x 4 combination motor draws 19 amps calculates total power put 130 watts think airplane needs seven-cell pack use 550-type motor want reliable takeoffs grass Although can done six cells marginal much fun remotored Great Planes Goldfire motor has much poop usual 550 course ex pense much higher current over 30 amps current-limiting STW speed con troller wouldnt let 26 amps get through flight times short absurd tried Futaba MCR 4A re ceiver great success able use six-cell packs am getting ahead myself Lets build first Construction Wings make plywood master rib cut ribs sharp No11 blade center section ribs just trim A6 off top bottom surfaces Decide what size spars want make spar cut outs suit used /8 x /16 basswood spars rather uncommon sizeso might use /8 x bass spruce Don t use balsa spars wont strong weight saving would negligible Use medium weight straight-grained balsa rest wing dihedral brace ply goes between spars does shear webbing Dont leave webbing out weighs little adds lot stren2th can build either top lower wing first will constructed panel time Start laying down lower spar trailing edge Place ribs position angling root rib bit dihe dral add top spar dry ie no glue Eyeball everything assure straight use thin CyA glue things solid Add leading edge being careful shim up lined up top bottom ribs Glue wing tip pieces add vertically grained shear webbing between spars braced trailing edge gussets Now build other wing panel youre finished cut slot root ribs dihedral brace December 1990 47 No havent just landed underside view shows slight wing sweep generous tail mo ment translucent covering Barely visible fuse mount ahead lower wing cen ter section Bottom hatch Balsa rails keep motor pack seven 900SCRs centered Note wire yoke rear No 64 elastic 3A-ln dowel acts forward battery hold-down point Everythings mounted hatch base Yoke held CyA has stood some unexpected arrivals four notches sides clear cabane struts Join two halves epoxy have time make adjustments suring have correct dihedral inch side top wing 1 /2 side bottom wing Next A-in center section trailing edge piece can shaped added can leading edge A-in piece Glue center section sheet Keep mind spars flush covering dont sheet over strut fittings made A-in sheet notched interplane struts backed / ply just buttglued side ribs strong enough struts weaker wing structure will knock out break before damaging wing experience speaks Brace rear fitting %-in sq flush covering surface other wing built exactly same way Tail The stabilizer needs no explanation fin rudder built using old Free Flight technique called laminating Its easy strong looks great First cut A-in balsa blank form inside line fin rudder Dont bother wax anything Next cut seven strips soft A2 x x 24in balsa additional strip little wider Pin form down surface covered waxed paper Stack strips together using pins hold things place wrap around form slightly wider strip should inside next form use little tension pull ing strips around will find dry wood bends quite easily Once strips pinned place push laminations down flush build ing surface Now use thin CyA glue everything solid being careful get glue form slightly wider piece placed against form acts dam stop CyA sticking lam inations form Once glue has set unpin outline tum over CyA other side stack has set gently spring outline open will quickly see lam inations need glue Now thumbtack sheet fine sandpaper 48 Model Aviation Lower wing cutout radio bay has enough room lot Two 51338 right receiver battery pack sit middle Note mounted balsa floor grain across fuselage Minimal foam needed because lack vibra tion some should used protection rough landings fuselage holder on/off switch ahead wIng Construction wing outlined article Top view nose sans hatch Note side thrust DSC 075 motor Looks snug everything fits fairly easily bottom STW Sommeraur MK3 speed controller motor/controller connectors top Loose set connectors battery pack tached underside hatch XLR *8RL w/PLS I9ARTJNIRVINE 4 BRLRRj8& g Q8EL&R 6LFU- x -4 tic WfRE 4 8nL~ \\ Q N Cl 16 o5Q B l-OMERcN8 075 M0rc N 11~~~ 0 0fif i 0ji~MRIRVJNE 0 fl-VINe 51YI 0 TW PLANL OL BUDDr5HEFT IA UC NOj- VNCflcJLRUT INSIDE NDRINJNG S7Rflh ToPUJ1Io~JTH WIN& N 4BAL8R&HErT Q Q TE flat surface carefully sand out line smooth find works best hold under extended fingers sand cir cular motion Once reasonably smooth pin plan add other pieces trimming outline leave leading edge little long can act key rear fuselage upper surface Now can cut rudder free think will pleasantly surprised strong structure Fuselage Construct both basic sides 3/ square sheet best second side constructed over first small pieces wax paper glue joints pre vent two sides sticking together Note right side shorter left give built-in side thrust cabane struts will glued slotted balsa pieces fuselage Dry fit pieces groove accept 1/16 spring steel cabane wires before glu ing place Make sure slots inside surface fuselage Groove upper longerons accept cabanes add A6 sheet doubler inside both sides Note does run full length nose stops short motor bulkhead provide slot its insertion later Fill ward two bays /16 sheet Now add / x 3A6-in strips tail end let A6 sheet outside edge course time being care ful build right left sidearent assemble basic fuselage put gether upside down forward upper longerons flat against building board temporary Y6-in -sq crosspiece forward cabane mount permanent ones rear battery hatch leading trailing edges wing Now have basic box should square angles Check redo necessary cant expect plane fly straight looks like should have Chi quita painted side Once straight pull forward fuse lage together install motor bulk head Next draw rear fuselage together tail join checking straight ness Add remaining /l6 cross pieces Next bend landing gear sew landing gear bulkhead wire Spread epoxy glue over sewn joint glue assembly position fuselage doing might want temporarily attach lower wing check level rear fuselage has piece A-in sheet set between upper rear longe rons act base fin left leading edge fin little long can cut slot forward edge piece accept Dont add tail skid yet easier after have cov ered fuselage Now can add rear turtledeck form ers Cut slot center A6 x A-in stringer top center former Ad just things until stringer straight level glue place Next using straightedge very sharp blade cut slots other two stringers side equidistant center stringer upper longeron three stringers end up being flush last crosspiece just ahead fin Add diagonal bracing top bottom first add side bracing lower cowl sheeting should added yet Now get hatch Hold piece A-in sheet top trace along inside upper longerons Cut A-in sheet out leaving line Next carefully break out temporary crosspiece glued across forward center section struts landing gear bulkhead helps hold sides apart now Carefully sand hatch base until snug tight fit Glue formers place add sheeting two halves front back Now add side pieces easier add after adding sheeting before Trim cockpit outline notch sides cabane struts Add lower cowling A6 sheet wing dowels bits pieces nose Round off make nose look little like radiator Now its done Radio power installation found Continued page 155 Lower end interpiane struts Diagonal bracing apar rib iooka fiimsy Strut piastic straw roughiy-shapod balsa strip inside Wing hoids place appearance oniy Laminated outline technique fin rudder illustrated right Straight pieces brace outline against warping Rudder pushrod longer ideal because tight rear fuselage Note links use tubing keeper 50 Model Aviation Lower rear fuselage Simple tall skid dowel quite strong Note small brass locknut backing Quick Link Its railroad supplier Looks neat Dont overtighten youll weaken brass coupler fly off pavement consider using wire tall skid run antenna fin top 1116 PLYWOOD TOP WING 1/16 PLYWOOD ING DIHEDRAL BRACES DIHEDRAL- UPPER WING HERE AT EACH TIP BALSATWO STRIPS OF lAB I/B__________________ I/B3/16BASSWOOD3/161/4BALSAFILLPLY UNDERSIDE OF UPPER SPARS TOP 6 BOTTOMLEADING EDGE___________________ 1/16 BALSA SHEET 1/16 BALSA WEBTOPS BOTTOM BOTH 3/4 3/16 BALSA GRAINWINGS TRAILING EDGE R-3 BALSA FILL3/IA 1/4 BALSA LEADING EDGE 1/4 BALSA WITH _____1/64 PLY BACKING N-I N-I\WING STRUT N-S ____ N-Gil1SLOT 3/6 BALSA BALSA F-I R-26-3TRAILING EDGE F-2 B F-3HATCH EDGE I/B A SHEET~i3/43/IRTE -HATCH BASE6-I DIG MWCOT /16 WIDE SLOT WING DETAIL F-43/lA BALSA1/16IN RI AETER ASSEMA SHEETWING NAILS F51A6BALSA I/IA DIG MUSIC I: SHEETWINE CABANE F-6G-V4 3/IA SONOTE U I/IA BALSA SHEET DGUBLFR WITH LIGHTBHG HOLES 3/16 1/2 BALSA I/A 5/16 BALSA GROOVED FOR HATCH EDGE- SEECABANE3/16 50 AA5A F- CROSS SECT I/IA I/B PLY GI/4LONGTO F-4SA7 -- - --- 2 INCIDESCE I/B PLYWOOD OPTIONAL-MOTOR 3/IA SO BALSA UPRIGHT B CROSS PIECES MOTOR MOUNTSHEET ELS-WILLIAMS ELAGE SIDE VIEW /BROS ON DAVE 3/32 DIG MUSE WINEBROWN WHEELS LEAVE THE BOTTOM OF LAST I/IA BALSA SHEET FLUSH WITH OUTER EDGE WING SPAN WING AREA ELECTRIC MOTOR BATTERY PACK PROP SPECIFICATIONS I/N I6 BALSA STRINGER TYPICAL DIHEDRAL LOWER WINGI_ EACH TIP Il/B PLY 0 HEORAL BRACE 3/16 50 BALSA tB 3/16 50 BALSA 3/16 BALSA SHEET STAB 3/IA S/B BALSA 3/IA 1/3 BALSA 3/16 SQ BALSA HINGE TO SUIT C ELEV I/B PLYWOOD 3/32 DIG LANDING GEARMUSIC WINE SEE CONSTRUCTION DETAIL FRONT REAR I/A DIA MUSIC WIRE NOTCH TO GIVE CABANEEPOXY GRIP hPATTERN 0I23456 MODEL AVIATION KRUMPLER DESIGNED BY MARTIN IRVINE 39-I/U 500 55 IN SAC 075 SANYO 7 CELLTRACING BY 30E DEMARCO TAIPAN 5 4 RIGHTS RESERVED 0 0 I0 0 CD 0 CD 2 0 CD -I -L Co 0 0 U World Engines$25-$35 72 MHz NB receivers offered RCD types $6995 Other 27 50 53 72 75 MHz com plete RC service Speed controls chargers repaired P & H $5-$lO Tim Abrens/Aero Electronics 127 Route 6 Box 54J Austin TX 78737 72 MHz transmitters serviced Ace RC Futaba FM sticker$10 AM conversion $15 Alignment plus crystals$40-$5O Other 27 50 75 MHz bands ser viced Custom applications Ni-Cd peak detector chargers P & H $6-$9 Authorized RC Service 128 327 South Stage Coach Lane Fallbrook CA 92028 tel 1-601/728-0440 Open Wed nesday Thursday Friday Saturday 10 am-230 pm 72 MHz transmitters serviced Ace Air tronics Cannon Cox Futaba Hobby Shack Kraft Pro-Line others 72 MHz receivers offered RCD $6995 plus crystal$695 Ace$75$115 P & H $5-$8 Bill Slayton 129 1005 Phillips Drive Dumas TX 79029 E L Lltchfield 130 4707 Woodside Manor Tampa Fl 33624 tel 1-813/8785382 Peter Calvagna 131 1092 Becker School Rd Freeport IL 61032 Thomas Albrlght 132 7303 Stony Hill Rd Wake Forest NC 27587 Krumpler/Irvine Continued page 50 Krumpler threatening end up nose heavy put motor battery aft end hatch Two Y6-sq strips glued bottom hatch spac ing equal width power pack pack rested between Next wire yoke glued rear hatch angled dowel added forward end battery placed between wood strips held place #64 rubberband stretched between yoke dowel first time have used technique works well shall use again makes battery access easy hatch itself held #32 rubberband looped over hatch forward wing dowels Its crude effec tive going use MCR 4A re ceiver add cooling scoops sides nose top hatch will help keep receivers MOSFETs metal oxide-semiconductor field-effect transis torsEd cool efficient kept way Servos mounted far back possi ble put cross sheet /16 below bat tery pack placed receiver initially midsized FMlO7N its battery pack 5R300 mAh between lower wing speed controller Sommerauer Mk 3 25-amp 6- 14-cell unit under motor current-limiting de sign installed fuse under cowling anyway first saw particular arrangement issue newsletter Electric Model Flyers Southern Ontario EMF SO Two Sermos connector housings glued together piece /16 ply tween two small pieces /32 ply AEROMODEL GIANT SHARK ARC PRE-BUILT 0 SHARK $21495 SEE YOUR HOBBY DEALER EIRST SEND STAMPED #10 ENVELOPE POR INFO KINGS WAY RIG HOBBY SUPPLY 5559 RICHMOND HOUSTON TX 77056 DEALERS ONLY 1-800-621-7783 December 1990 155 Sound Supression Oesign High Thrust Efficiency Long Fiber Advanced Composite Material Proven Performance US Masters US Nation als Canadian Nationals World Champion ships Spoits Sizes 57x3 7x3 7x4 7x5 7x6 7x7 7x8 7x9 7x10$159EACH 8x4 8x5 BxB 8x7 8x8 SxS BxlO $179 EACH 9x4 9x5 9x6 9x7 9x8 9x9 9x10 $199 EACH 95x45 10x6 lOx 7 10x8 10x9 lOx 10 $229 EACH 11 xB 11 x7 11 xB 11 x9 12x6 12x7 12x8 ..$289EACH Competition 11 xlO 11 xli 11 x12 11 xl2W 11 x13 11 x14 12x9 12x9W12x10 l2xlOW 12x11 l2xllN 12x 12 12x12N 12x 13 12x13N 12x14 $795 EACH 135 x 125 135 x 14 14 x8 14x 10 14x 12 14x 14 144 x 105 144 x 12 $1295 EACH Contact local hobby dealer Manufactured Landing Products Knights Landing California glued inside housings order put contact under pressure assembly glued A2-in mounting plate turn mounted aircraft nice part about have fused system safety can use arming switch removing replacing fuse Off might want attach fuse airframe short length cord dont lose have used system number models though speed controller limits amperage fully stalled motor fuse doesnt blow al though certainly will control ler Later changed radio Futaba Electric radio MCR 4A receiver dropped weight about four oun ces sneezed Graupner 8 x 4 prop seven 900SCR Ni-Cd cells motor Goldfire now draws over 30 amps according DSC ammeter original current-limiting STW control ler wouldnt pass 26 amps amounts input over 200 wattsor about 100 watts per pound model weight Rocket-propelled biplanes cup tea substituted six-cell l200SC pack dropped peak current freshly charged pack 27 amps 162 watts still potent combination has poop original setup Interestingly requires side thrust before may due fact removal two-ounce speed controller nose aircraft moved CG aft bit made controls little sensitive added air scoops made plastic spoons nose increase airflow over MCR 4As MOSFETs con troller isnt supposed handle current magnitude However have run set seven 900SCRs down just cool ing see photos using Graupner 8 x 4 prop 30-plus amps ini tially shut down after 105 sec let cool got just 15 sec Therefore would guess would have worked air adding scoops much better MOSFETs As now land can feel MOS FETs cool touch remove battery pack have heard people having difficulty radios such shutting down motor too soon being able handle 15 amps Another local flier has similar results both MCR 4A units think troubles other people have must defec tive units some other installation problem complaint radio 50-Hz controller isnt very good fer rite motors time magnets will lose power sounds slightly rough lower throttle settings right applica tion think great little rig Certainly have respect now know what can Its keeper MtCfled Performance system TOP PERFORMANCE K&B ENGINES AirplaneMarine K&B FUELS K&B GLOW PLUGS 9 Blends4 Chsices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B Micro-Bailsons FILLtR K&B SUPER FOXY RESIN K&B THINNER K&B SUPER POXY PRIMER K&P IIPPR pesy PaINT note wiring connectors may order Use good stuff Cheap power systems need best expensive sys tems deserve have standardized con nectors sold Sermos same Anderson Power Poles available Hobby Horn Sermos Jomar SR number other Electric suppliers best avallable Similarly use specialty wire same suppliers youre sure something phone will help out right over phone object using wire minimize losses electrical system Theres no point wasting power dont need cost best especially compared cost airplane very small Covering Any iron-on film market will work well aircraft because strength wing thanks hard wood spars covered entire airframe lightest Coverite Micafilm V ozIyd us ing Balsarite adhesive find clear easier put colored gives airplane clear-doped tissue look also shows off construction rather well provides incentive good work careful adhere covering rib spar extra strength imparts can trim film wish over 156 Model Aviation 555 APCJ APC PROPELLERS CULPEPPEE C MODELS INC 2526 Washington DubuqueIA 52W1 31915334839 Micaflim Assembly Glue wing hold-down dow els rubberband bottom wing position Next slide formed center sec tion struts place Lift out Ae-dia holes fuselage until top wing sits indicated angle inci dence Robart incidence meter works well Remove make sure free surface oil grease notched provide good grip glue Smear slow-setting epoxy drip some holes reassemble Again check angle incidence checking upper lower wing tips same distance apart satisfied let set overnight Now top cross pieces bent bound center section struts soldered Ply wood strips used provide bearing sur faces positive location keying wing glued top wing cut ting away some film ensure ade quate adhesion used quite crude locat ing system because tight schedule building model plan shows abet ter can add some balsa strips simulate scalelike struts make sure wont foul battery hatch wing attachment finished care fully glue stab fin place making sure straight used Sig CA hinges original Williams Bros 2-in wheels used undercarriage About time tail skid can added nonfunctional interplane struts made slightly rounded /t6 balsa inside large plastic drinking straws de signed held place wing ten sion meant come out break before wing damaged case hard landing hitting something Now can balance airplane best procedure try move things around inside necessary achieve cor rect balance rather adding balance weights following summary originals weights 1 oz grams Top wing complete uncovered46 gm Balsarite adhesive3 gm Covered54 gm Covered lettered59 gm Bottom wing 3 grams less Fuselage complete dowels cabane wires landing gear no pushrods wheels cabane cross wiresun covered78 gm Balsarite adhesive2 gm Covered83 gm Stabilizer elevator uncovered 8 gm Coveredil gm Fin rudder uncovered4 gm CoveredS gm Total airframe12 oz Radio weight75 oz later MCR 4A RX35 oz SEE YOUR DEALER OR ORIER DIRECT PLEASE ENTER MY ORDER FORFUEL WJZZARDS AT $ 750 EACh POSTAGE PAID NAMESTREET_______________________ CITYSTATE_______________ ZIP_________ Motor weight connectors prop adapter9 oz Battery weight connectors 7 x 900SCRlO5 oz 6 x 12005CRuS oz Total flying weight STW reg ular radio 7 x 900s39 oz Total flying weight MCR 4A ra dio 6 x 1200s36 oz Flying As stated introduction original Krumpler required Right little Up trim Level flight maintained throttle quick takeoffs aer obatics require full nearly full throttle landing gear fairly far forward have ready correct swing takeoff isnt hard So far have ground looped Krumpler once its test flight before knew much right trim would neces sary takes off less 50 ft no wind less breeze keep flat after breaks ground gain little speed before start pulling much elevator Keep first flight two gentle until have feel airplane Later can throw around rudder throw quite sufficient elevator figure eights very small area Loops fairly straightforward require either nearly-full power lit tle dive first better wind Continued page 162 NOWATWO TAPE SET tape youve waiting finally herell youre new bobby just want learn secret wood plane construction YOU PLANE VIDEO Presents BUILDING IT RIGHT THE FIRST TIME FIRST NO-NONSENSE VIDEO OF WOOD AIRCRAFT CONSTRUCTION APPROX 4 HOURS ON eFuel tank installation eNew engine setup 0 Fuselage construction OBUILDING STRAIGHT C Installing pushrods C Covering film C Eliminating warps e Aligning Salancing C Final checkout ePLUS MUCH MORE! Radio installation Straight wing building Installing hinges C Shear webbing Applying PG cloth S Servo installation Setting up new radio Dozens building tips Slab tall surfaces Aileron installation CREDIT CARD CUSTOMERS Use toll free number place order Have VIS4 MasterCard VISA ready calI.24HR5 DAY OR mail $3495 S & H Iforelge orders add $800 5/H PLANE VIDEO terCaPO Box 23128 Cliv Iowa 50325 Iowa residents add 4%sales tax PLAN vicevanG1Ou1LO 7 fliuvYti FREEI800I 38382 5VTOLL FREE 24HR24HR OR 5151223-0897 December 1990 157 FUEL WIZZARD THE WORLDS FASTEST AND MOST CONVENIENT FUEL PUMP EVER * FITS ALL GALLON FUEL BOTTLES * FAST ONE STROKE LL OUNCE OF FUEL * ALL FUEL SAFE GLO FUEL & GASOLINE SUGGESTED RETAIL $995 NOW JUST $750 ORDER FROM ACME PLASTIC PUMP CO P 0 BOX 24551 MINNEAPOLIS MN 55424 DEALER INQUIRIES INVITE) FILLS THE LARGEST MODEL FUEL TANKS IN SECONDS Krumpler/Irvine Continued page 157 loops deteriorating plane falling off top battery running down its time pian landing Spins require CG further back whit used initially removal two-ounce speed controller nose can get spin little power just top stall needs blast air across tail get going Stall turns easy Just go power push stick over Snap rolls level flight just easy Feed little Up elevator just see nose start rise pull stick right over full back zips right around actually pauses level flight before going spiral dive pause cue let go stick can make way down length field snapping 10 20 yards stall turn other end repeat comine other way glide moderate remember bi planes draggy better struts Nevertheless find biplane struts mildly offensive usually have Make first few approaches bat tery power left have option going around rumbling generally fly until detect slight drop power cut throttle come just last little bit reserve SCR cells have sharp discharge knee almost like running out fuel whereas SCs give about 30second warning airplane best calm weather steady breeze 1989 KRC Fun Fly quite windy varied constant fine Krumpler gusty flyable much fun best time have far has evening flying wind has dropped THE WIREMASTER TM bessderutcolter extra large handle bends 1/8-1/4 coils S/ 32-3116 music wire Wlre peep eliminated ANTI-KREEP WIRE LOCKTh free catalog also has hardware accessories JOM COMPANY 114 Washfrlgton T Dept Waukegan IL 60095 can shoot touch-and-go after another admiring set ting sun shines through covering put skis winter flying put Goldfire Flying qualities deterior ated slightly because extra drag weight skis nothing major Conclusion What might change sec ond Krumpler might shorten nose bit build straight wings ease ten dency towards nose-heaviness might turn something else air Krumpler has bit Tiger Moth itand little Bucker Jungmann well creative modeler might take few minor changes create nice small Scale Electric last point build Krum pler please send comments photo Martin Irvine 34 Beaver Crescent Kingston Ontario Canada K7M 7C 1 will answer correspondence would appreciate sending stamp RC Helicopters/Jolly Continued page 52 Concept 30 SX complete highperformance package expert fliers Kit Concept 30 SX arrived nicely packaged gold box vividly displaying SXs sleek lines lid slid off parts exposed evident Concept 30 SX pure Kyosho kit features excellent quality obvious thought put part SX shipped standard Concept struction manual two separate addendum sheets pertain specifically SX Kyosho understands multinational necessity clear pictures result manuals feature ex cellent illustrations just enough text take over rough spots standard Concept manual over 30 pages super piece work Anyone can build Concept merely looking pictures matching parts fas teners Concept 30 SX difficult assemble Following instructions letter took under seven hours start finish Youll have no problems Ill expand just briefly few steps feel may lacking text Step 11 Set clutch lining place glue thin CyA add glue first youll tiAWIUKUUKKILANE RAF WAS GLAD TO H4 YE t SPITFIRE RIJTITIA4D TO HAVE T pSIS 00 01501 Add Si 500 hEFIa Usa VISAs MC 015151050 015 COO Polyester HaM Laid Fibealaaa1/aS Soale Fuselage ngspan.50 noVas lete eels aod llardwaeFuse LengTh. 0353 lncttea Paclsages IndudadWeight.12 Lbs Meotrina Cut Foam Adog Cares Fonssr.2oy5OTs 108 Any 125 / Heavy Duty Styiene Clam Canopy1mm Legal / Flbertleas Cowl Fuse H Molded Stringers Easy RuildEsay Fly Esoellent Beginnem Waibjid SoossassIss AesHaWe 55550 reps s sed Fplns trawsa SeataTkea8t5jbs55alieht0tats IR5m5 5 LRta 054 Las 0th /S KIt AeettRhe Wue isa. a WutS leSs 750*5 Pes.ZeyW Ta toe Aan tss Jte Pun 551 a. P5351 P P-a ME-flOsS Nasmyx 1LU3Mesa Ms5oTan8 ml P5133 035331 l-amoaavImn never get lining belongs before sticks itself tableyou get pic ture step 13 main frame assembly call out 2 x 3 x 10mm-long self-tapping screws illustration shows could shorter hold cooling shroud place fact screws too long will bind up clutch bell step 19 tail rotor assembly make sure use plastic-compatible screw cement supplied kit good job tightening pitch ring nut slide bushing assembly could better designed allow positive grip during assembly would help ensure nut will separate bushing dur ing use step 21 dont glue new control rod sup ports place Instead decide go apply -in strip vinyl electrical trim tape boom Rub edges tape down well slide supports position twisting motion Youll find fit snugly removable can also put some tape boom under horizontal stabilizer help snug up step 31 installation canopy should use additional two screws front lower sides canopy keep decals lifting canopy front edge Id like add suggestions just no way intended detract Concept manual excellent build ing aid kit complete Concept yos would literally have try fail keep achieving success What radio Concept SX used Air tronics Vanguard six-channel FM system SGX gyro transmitter features dual rates elevator aileron has idle up setting pitch trim revolution mix throttle hold servo reversing switches todays standards Vanguard rates very basic heli system Unlike PCM 10 1024 hell pilots will able use everything Vanguard-type sys tem Its perfect beginner will per form contest system Novice Scale maybe far Intermediate since can per form upright maneuvers SGX system comes gyro mixer dedicated tail rotor servo features single adjustable gain reversing switch FAt caliber its perfect novice will want set gain up high authority adjust gyro suit taste pro gresses SGX will also find favor fixedwing tail-dragger pilots think its just ticket short-coupled Scale ship gets fe isty takeoff Check out couldnt easier install Vanguard performed admirably glitch think however suitable training SX will capable everything expert will want SX mind switched over Air tronics Spectra 7 PCM radio still pre microprocessor has enough bells whis tles allow competent pilot explore SXs inverted capabilities motivator power used standard 05 32 FSR H coupled Vortexs Eikohgiken C 30 muffler What can say about start idle produce lot powerall good things want heli motor C 30 seems help out power department has added advantage allowing adjust low idle mixture motor once course 162 Model Aviation Rubber ft Ongine Power Free Flight Display Control Line Eleotric Power RIC Airplenee new liluetrated 32 page tabloId size catalog US ft Canade $100 Foreigh $300 Penn Valley Hobby Center 837-A W Main St Lanadale PA 18446 215 368-0770 ZENOAH SACHS-DOLMAR & QUADRA ENGINES ERCOUPE TOMAHAWK & J-3 KITIEN KITS ZINGER & DYNATHRUST PROPS FUEL TANKS Carbon-Fiber Arrowahafte Ceconite & Glue DGA & MGA PILOTS Send $100 catalog JIM MESSERS QUALITY MODEL PRODUCTS Valley View Dr Box 43 Allegany NY 14706
Edition: Model Aviation - 1990/12
Page Numbers: 46, 47, 48, 49, 50, 51, 155, 156, 157, 162
NO OCR TEXT 1_ _ - iI-4La{ ______ tric-powered biplane looks like might actually have post-WW full-scale plane early homebuiltbut its Its entirely original design Build lot easy sport flying EMartin Irvine TWO WEEKS before 10th Annual KRC Electric Fun Fly found myself needing new airplane love NW biplanes course everyone knows Electric bipes require too much power overcome drag truly practical obvi ously have never seen Keith Shaws 60-size Stearman decided kept fuse lage fairly small number struts minimum should OKa nice slow flier What banged together two weeks what see test flew sun going down Friday September 15 11 hours before leave KRC meet Id like say flew right off board design ers have admit required three-fourths Right rudder two clicks Up elevator trim before flew straight Big deal thought amount rudder re quired because lack right thrust motor Small bipes often require sideand down-thrust haste forgot side-thrust tried model still required some right trim cant see warps anyway dont mind small amount trim down-thrust built way wing incidence 20 30 top bottom wings respectively sta bilizer incidence 2 O causes air plane fly slight downward angle ef fectively giving down-thrust flew number flights KRC meet terrific weekend anyone inter ested Electrics should attend least once got requests plans five people made think might have wider appeal article re sult specification table will tell what might want know about Krumpler just couple ad ditional notes needed first used DSC 075 motor sim ilar 075/550-size motors current generation complete kit Electric trainers sport planes bat tery pack Sanyo seven-cell 9005CR pack prop used Taipan 8 x 4 combination motor draws 19 amps calculates total power put 130 watts think airplane needs seven-cell pack use 550-type motor want reliable takeoffs grass Although can done six cells marginal much fun remotored Great Planes Goldfire motor has much poop usual 550 course ex pense much higher current over 30 amps current-limiting STW speed con troller wouldnt let 26 amps get through flight times short absurd tried Futaba MCR 4A re ceiver great success able use six-cell packs am getting ahead myself Lets build first Construction Wings make plywood master rib cut ribs sharp No11 blade center section ribs just trim A6 off top bottom surfaces Decide what size spars want make spar cut outs suit used /8 x /16 basswood spars rather uncommon sizeso might use /8 x bass spruce Don t use balsa spars wont strong weight saving would negligible Use medium weight straight-grained balsa rest wing dihedral brace ply goes between spars does shear webbing Dont leave webbing out weighs little adds lot stren2th can build either top lower wing first will constructed panel time Start laying down lower spar trailing edge Place ribs position angling root rib bit dihe dral add top spar dry ie no glue Eyeball everything assure straight use thin CyA glue things solid Add leading edge being careful shim up lined up top bottom ribs Glue wing tip pieces add vertically grained shear webbing between spars braced trailing edge gussets Now build other wing panel youre finished cut slot root ribs dihedral brace December 1990 47 No havent just landed underside view shows slight wing sweep generous tail mo ment translucent covering Barely visible fuse mount ahead lower wing cen ter section Bottom hatch Balsa rails keep motor pack seven 900SCRs centered Note wire yoke rear No 64 elastic 3A-ln dowel acts forward battery hold-down point Everythings mounted hatch base Yoke held CyA has stood some unexpected arrivals four notches sides clear cabane struts Join two halves epoxy have time make adjustments suring have correct dihedral inch side top wing 1 /2 side bottom wing Next A-in center section trailing edge piece can shaped added can leading edge A-in piece Glue center section sheet Keep mind spars flush covering dont sheet over strut fittings made A-in sheet notched interplane struts backed / ply just buttglued side ribs strong enough struts weaker wing structure will knock out break before damaging wing experience speaks Brace rear fitting %-in sq flush covering surface other wing built exactly same way Tail The stabilizer needs no explanation fin rudder built using old Free Flight technique called laminating Its easy strong looks great First cut A-in balsa blank form inside line fin rudder Dont bother wax anything Next cut seven strips soft A2 x x 24in balsa additional strip little wider Pin form down surface covered waxed paper Stack strips together using pins hold things place wrap around form slightly wider strip should inside next form use little tension pull ing strips around will find dry wood bends quite easily Once strips pinned place push laminations down flush build ing surface Now use thin CyA glue everything solid being careful get glue form slightly wider piece placed against form acts dam stop CyA sticking lam inations form Once glue has set unpin outline tum over CyA other side stack has set gently spring outline open will quickly see lam inations need glue Now thumbtack sheet fine sandpaper 48 Model Aviation Lower wing cutout radio bay has enough room lot Two 51338 right receiver battery pack sit middle Note mounted balsa floor grain across fuselage Minimal foam needed because lack vibra tion some should used protection rough landings fuselage holder on/off switch ahead wIng Construction wing outlined article Top view nose sans hatch Note side thrust DSC 075 motor Looks snug everything fits fairly easily bottom STW Sommeraur MK3 speed controller motor/controller connectors top Loose set connectors battery pack tached underside hatch XLR *8RL w/PLS I9ARTJNIRVINE 4 BRLRRj8& g Q8EL&R 6LFU- x -4 tic WfRE 4 8nL~ \\ Q N Cl 16 o5Q B l-OMERcN8 075 M0rc N 11~~~ 0 0fif i 0ji~MRIRVJNE 0 fl-VINe 51YI 0 TW PLANL OL BUDDr5HEFT IA UC NOj- VNCflcJLRUT INSIDE NDRINJNG S7Rflh ToPUJ1Io~JTH WIN& N 4BAL8R&HErT Q Q TE flat surface carefully sand out line smooth find works best hold under extended fingers sand cir cular motion Once reasonably smooth pin plan add other pieces trimming outline leave leading edge little long can act key rear fuselage upper surface Now can cut rudder free think will pleasantly surprised strong structure Fuselage Construct both basic sides 3/ square sheet best second side constructed over first small pieces wax paper glue joints pre vent two sides sticking together Note right side shorter left give built-in side thrust cabane struts will glued slotted balsa pieces fuselage Dry fit pieces groove accept 1/16 spring steel cabane wires before glu ing place Make sure slots inside surface fuselage Groove upper longerons accept cabanes add A6 sheet doubler inside both sides Note does run full length nose stops short motor bulkhead provide slot its insertion later Fill ward two bays /16 sheet Now add / x 3A6-in strips tail end let A6 sheet outside edge course time being care ful build right left sidearent assemble basic fuselage put gether upside down forward upper longerons flat against building board temporary Y6-in -sq crosspiece forward cabane mount permanent ones rear battery hatch leading trailing edges wing Now have basic box should square angles Check redo necessary cant expect plane fly straight looks like should have Chi quita painted side Once straight pull forward fuse lage together install motor bulk head Next draw rear fuselage together tail join checking straight ness Add remaining /l6 cross pieces Next bend landing gear sew landing gear bulkhead wire Spread epoxy glue over sewn joint glue assembly position fuselage doing might want temporarily attach lower wing check level rear fuselage has piece A-in sheet set between upper rear longe rons act base fin left leading edge fin little long can cut slot forward edge piece accept Dont add tail skid yet easier after have cov ered fuselage Now can add rear turtledeck form ers Cut slot center A6 x A-in stringer top center former Ad just things until stringer straight level glue place Next using straightedge very sharp blade cut slots other two stringers side equidistant center stringer upper longeron three stringers end up being flush last crosspiece just ahead fin Add diagonal bracing top bottom first add side bracing lower cowl sheeting should added yet Now get hatch Hold piece A-in sheet top trace along inside upper longerons Cut A-in sheet out leaving line Next carefully break out temporary crosspiece glued across forward center section struts landing gear bulkhead helps hold sides apart now Carefully sand hatch base until snug tight fit Glue formers place add sheeting two halves front back Now add side pieces easier add after adding sheeting before Trim cockpit outline notch sides cabane struts Add lower cowling A6 sheet wing dowels bits pieces nose Round off make nose look little like radiator Now its done Radio power installation found Continued page 155 Lower end interpiane struts Diagonal bracing apar rib iooka fiimsy Strut piastic straw roughiy-shapod balsa strip inside Wing hoids place appearance oniy Laminated outline technique fin rudder illustrated right Straight pieces brace outline against warping Rudder pushrod longer ideal because tight rear fuselage Note links use tubing keeper 50 Model Aviation Lower rear fuselage Simple tall skid dowel quite strong Note small brass locknut backing Quick Link Its railroad supplier Looks neat Dont overtighten youll weaken brass coupler fly off pavement consider using wire tall skid run antenna fin top 1116 PLYWOOD TOP WING 1/16 PLYWOOD ING DIHEDRAL BRACES DIHEDRAL- UPPER WING HERE AT EACH TIP BALSATWO STRIPS OF lAB I/B__________________ I/B3/16BASSWOOD3/161/4BALSAFILLPLY UNDERSIDE OF UPPER SPARS TOP 6 BOTTOMLEADING EDGE___________________ 1/16 BALSA SHEET 1/16 BALSA WEBTOPS BOTTOM BOTH 3/4 3/16 BALSA GRAINWINGS TRAILING EDGE R-3 BALSA FILL3/IA 1/4 BALSA LEADING EDGE 1/4 BALSA WITH _____1/64 PLY BACKING N-I N-I\WING STRUT N-S ____ N-Gil1SLOT 3/6 BALSA BALSA F-I R-26-3TRAILING EDGE F-2 B F-3HATCH EDGE I/B A SHEET~i3/43/IRTE -HATCH BASE6-I DIG MWCOT /16 WIDE SLOT WING DETAIL F-43/lA BALSA1/16IN RI AETER ASSEMA SHEETWING NAILS F51A6BALSA I/IA DIG MUSIC I: SHEETWINE CABANE F-6G-V4 3/IA SONOTE U I/IA BALSA SHEET DGUBLFR WITH LIGHTBHG HOLES 3/16 1/2 BALSA I/A 5/16 BALSA GROOVED FOR HATCH EDGE- SEECABANE3/16 50 AA5A F- CROSS SECT I/IA I/B PLY GI/4LONGTO F-4SA7 -- - --- 2 INCIDESCE I/B PLYWOOD OPTIONAL-MOTOR 3/IA SO BALSA UPRIGHT B CROSS PIECES MOTOR MOUNTSHEET ELS-WILLIAMS ELAGE SIDE VIEW /BROS ON DAVE 3/32 DIG MUSE WINEBROWN WHEELS LEAVE THE BOTTOM OF LAST I/IA BALSA SHEET FLUSH WITH OUTER EDGE WING SPAN WING AREA ELECTRIC MOTOR BATTERY PACK PROP SPECIFICATIONS I/N I6 BALSA STRINGER TYPICAL DIHEDRAL LOWER WINGI_ EACH TIP Il/B PLY 0 HEORAL BRACE 3/16 50 BALSA tB 3/16 50 BALSA 3/16 BALSA SHEET STAB 3/IA S/B BALSA 3/IA 1/3 BALSA 3/16 SQ BALSA HINGE TO SUIT C ELEV I/B PLYWOOD 3/32 DIG LANDING GEARMUSIC WINE SEE CONSTRUCTION DETAIL FRONT REAR I/A DIA MUSIC WIRE NOTCH TO GIVE CABANEEPOXY GRIP hPATTERN 0I23456 MODEL AVIATION KRUMPLER DESIGNED BY MARTIN IRVINE 39-I/U 500 55 IN SAC 075 SANYO 7 CELLTRACING BY 30E DEMARCO TAIPAN 5 4 RIGHTS RESERVED 0 0 I0 0 CD 0 CD 2 0 CD -I -L Co 0 0 U World Engines$25-$35 72 MHz NB receivers offered RCD types $6995 Other 27 50 53 72 75 MHz com plete RC service Speed controls chargers repaired P & H $5-$lO Tim Abrens/Aero Electronics 127 Route 6 Box 54J Austin TX 78737 72 MHz transmitters serviced Ace RC Futaba FM sticker$10 AM conversion $15 Alignment plus crystals$40-$5O Other 27 50 75 MHz bands ser viced Custom applications Ni-Cd peak detector chargers P & H $6-$9 Authorized RC Service 128 327 South Stage Coach Lane Fallbrook CA 92028 tel 1-601/728-0440 Open Wed nesday Thursday Friday Saturday 10 am-230 pm 72 MHz transmitters serviced Ace Air tronics Cannon Cox Futaba Hobby Shack Kraft Pro-Line others 72 MHz receivers offered RCD $6995 plus crystal$695 Ace$75$115 P & H $5-$8 Bill Slayton 129 1005 Phillips Drive Dumas TX 79029 E L Lltchfield 130 4707 Woodside Manor Tampa Fl 33624 tel 1-813/8785382 Peter Calvagna 131 1092 Becker School Rd Freeport IL 61032 Thomas Albrlght 132 7303 Stony Hill Rd Wake Forest NC 27587 Krumpler/Irvine Continued page 50 Krumpler threatening end up nose heavy put motor battery aft end hatch Two Y6-sq strips glued bottom hatch spac ing equal width power pack pack rested between Next wire yoke glued rear hatch angled dowel added forward end battery placed between wood strips held place #64 rubberband stretched between yoke dowel first time have used technique works well shall use again makes battery access easy hatch itself held #32 rubberband looped over hatch forward wing dowels Its crude effec tive going use MCR 4A re ceiver add cooling scoops sides nose top hatch will help keep receivers MOSFETs metal oxide-semiconductor field-effect transis torsEd cool efficient kept way Servos mounted far back possi ble put cross sheet /16 below bat tery pack placed receiver initially midsized FMlO7N its battery pack 5R300 mAh between lower wing speed controller Sommerauer Mk 3 25-amp 6- 14-cell unit under motor current-limiting de sign installed fuse under cowling anyway first saw particular arrangement issue newsletter Electric Model Flyers Southern Ontario EMF SO Two Sermos connector housings glued together piece /16 ply tween two small pieces /32 ply AEROMODEL GIANT SHARK ARC PRE-BUILT 0 SHARK $21495 SEE YOUR HOBBY DEALER EIRST SEND STAMPED #10 ENVELOPE POR INFO KINGS WAY RIG HOBBY SUPPLY 5559 RICHMOND HOUSTON TX 77056 DEALERS ONLY 1-800-621-7783 December 1990 155 Sound Supression Oesign High Thrust Efficiency Long Fiber Advanced Composite Material Proven Performance US Masters US Nation als Canadian Nationals World Champion ships Spoits Sizes 57x3 7x3 7x4 7x5 7x6 7x7 7x8 7x9 7x10$159EACH 8x4 8x5 BxB 8x7 8x8 SxS BxlO $179 EACH 9x4 9x5 9x6 9x7 9x8 9x9 9x10 $199 EACH 95x45 10x6 lOx 7 10x8 10x9 lOx 10 $229 EACH 11 xB 11 x7 11 xB 11 x9 12x6 12x7 12x8 ..$289EACH Competition 11 xlO 11 xli 11 x12 11 xl2W 11 x13 11 x14 12x9 12x9W12x10 l2xlOW 12x11 l2xllN 12x 12 12x12N 12x 13 12x13N 12x14 $795 EACH 135 x 125 135 x 14 14 x8 14x 10 14x 12 14x 14 144 x 105 144 x 12 $1295 EACH Contact local hobby dealer Manufactured Landing Products Knights Landing California glued inside housings order put contact under pressure assembly glued A2-in mounting plate turn mounted aircraft nice part about have fused system safety can use arming switch removing replacing fuse Off might want attach fuse airframe short length cord dont lose have used system number models though speed controller limits amperage fully stalled motor fuse doesnt blow al though certainly will control ler Later changed radio Futaba Electric radio MCR 4A receiver dropped weight about four oun ces sneezed Graupner 8 x 4 prop seven 900SCR Ni-Cd cells motor Goldfire now draws over 30 amps according DSC ammeter original current-limiting STW control ler wouldnt pass 26 amps amounts input over 200 wattsor about 100 watts per pound model weight Rocket-propelled biplanes cup tea substituted six-cell l200SC pack dropped peak current freshly charged pack 27 amps 162 watts still potent combination has poop original setup Interestingly requires side thrust before may due fact removal two-ounce speed controller nose aircraft moved CG aft bit made controls little sensitive added air scoops made plastic spoons nose increase airflow over MCR 4As MOSFETs con troller isnt supposed handle current magnitude However have run set seven 900SCRs down just cool ing see photos using Graupner 8 x 4 prop 30-plus amps ini tially shut down after 105 sec let cool got just 15 sec Therefore would guess would have worked air adding scoops much better MOSFETs As now land can feel MOS FETs cool touch remove battery pack have heard people having difficulty radios such shutting down motor too soon being able handle 15 amps Another local flier has similar results both MCR 4A units think troubles other people have must defec tive units some other installation problem complaint radio 50-Hz controller isnt very good fer rite motors time magnets will lose power sounds slightly rough lower throttle settings right applica tion think great little rig Certainly have respect now know what can Its keeper MtCfled Performance system TOP PERFORMANCE K&B ENGINES AirplaneMarine K&B FUELS K&B GLOW PLUGS 9 Blends4 Chsices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B Micro-Bailsons FILLtR K&B SUPER FOXY RESIN K&B THINNER K&B SUPER POXY PRIMER K&P IIPPR pesy PaINT note wiring connectors may order Use good stuff Cheap power systems need best expensive sys tems deserve have standardized con nectors sold Sermos same Anderson Power Poles available Hobby Horn Sermos Jomar SR number other Electric suppliers best avallable Similarly use specialty wire same suppliers youre sure something phone will help out right over phone object using wire minimize losses electrical system Theres no point wasting power dont need cost best especially compared cost airplane very small Covering Any iron-on film market will work well aircraft because strength wing thanks hard wood spars covered entire airframe lightest Coverite Micafilm V ozIyd us ing Balsarite adhesive find clear easier put colored gives airplane clear-doped tissue look also shows off construction rather well provides incentive good work careful adhere covering rib spar extra strength imparts can trim film wish over 156 Model Aviation 555 APCJ APC PROPELLERS CULPEPPEE C MODELS INC 2526 Washington DubuqueIA 52W1 31915334839 Micaflim Assembly Glue wing hold-down dow els rubberband bottom wing position Next slide formed center sec tion struts place Lift out Ae-dia holes fuselage until top wing sits indicated angle inci dence Robart incidence meter works well Remove make sure free surface oil grease notched provide good grip glue Smear slow-setting epoxy drip some holes reassemble Again check angle incidence checking upper lower wing tips same distance apart satisfied let set overnight Now top cross pieces bent bound center section struts soldered Ply wood strips used provide bearing sur faces positive location keying wing glued top wing cut ting away some film ensure ade quate adhesion used quite crude locat ing system because tight schedule building model plan shows abet ter can add some balsa strips simulate scalelike struts make sure wont foul battery hatch wing attachment finished care fully glue stab fin place making sure straight used Sig CA hinges original Williams Bros 2-in wheels used undercarriage About time tail skid can added nonfunctional interplane struts made slightly rounded /t6 balsa inside large plastic drinking straws de signed held place wing ten sion meant come out break before wing damaged case hard landing hitting something Now can balance airplane best procedure try move things around inside necessary achieve cor rect balance rather adding balance weights following summary originals weights 1 oz grams Top wing complete uncovered46 gm Balsarite adhesive3 gm Covered54 gm Covered lettered59 gm Bottom wing 3 grams less Fuselage complete dowels cabane wires landing gear no pushrods wheels cabane cross wiresun covered78 gm Balsarite adhesive2 gm Covered83 gm Stabilizer elevator uncovered 8 gm Coveredil gm Fin rudder uncovered4 gm CoveredS gm Total airframe12 oz Radio weight75 oz later MCR 4A RX35 oz SEE YOUR DEALER OR ORIER DIRECT PLEASE ENTER MY ORDER FORFUEL WJZZARDS AT $ 750 EACh POSTAGE PAID NAMESTREET_______________________ CITYSTATE_______________ ZIP_________ Motor weight connectors prop adapter9 oz Battery weight connectors 7 x 900SCRlO5 oz 6 x 12005CRuS oz Total flying weight STW reg ular radio 7 x 900s39 oz Total flying weight MCR 4A ra dio 6 x 1200s36 oz Flying As stated introduction original Krumpler required Right little Up trim Level flight maintained throttle quick takeoffs aer obatics require full nearly full throttle landing gear fairly far forward have ready correct swing takeoff isnt hard So far have ground looped Krumpler once its test flight before knew much right trim would neces sary takes off less 50 ft no wind less breeze keep flat after breaks ground gain little speed before start pulling much elevator Keep first flight two gentle until have feel airplane Later can throw around rudder throw quite sufficient elevator figure eights very small area Loops fairly straightforward require either nearly-full power lit tle dive first better wind Continued page 162 NOWATWO TAPE SET tape youve waiting finally herell youre new bobby just want learn secret wood plane construction YOU PLANE VIDEO Presents BUILDING IT RIGHT THE FIRST TIME FIRST NO-NONSENSE VIDEO OF WOOD AIRCRAFT CONSTRUCTION APPROX 4 HOURS ON eFuel tank installation eNew engine setup 0 Fuselage construction OBUILDING STRAIGHT C Installing pushrods C Covering film C Eliminating warps e Aligning Salancing C Final checkout ePLUS MUCH MORE! Radio installation Straight wing building Installing hinges C Shear webbing Applying PG cloth S Servo installation Setting up new radio Dozens building tips Slab tall surfaces Aileron installation CREDIT CARD CUSTOMERS Use toll free number place order Have VIS4 MasterCard VISA ready calI.24HR5 DAY OR mail $3495 S & H Iforelge orders add $800 5/H PLANE VIDEO terCaPO Box 23128 Cliv Iowa 50325 Iowa residents add 4%sales tax PLAN vicevanG1Ou1LO 7 fliuvYti FREEI800I 38382 5VTOLL FREE 24HR24HR OR 5151223-0897 December 1990 157 FUEL WIZZARD THE WORLDS FASTEST AND MOST CONVENIENT FUEL PUMP EVER * FITS ALL GALLON FUEL BOTTLES * FAST ONE STROKE LL OUNCE OF FUEL * ALL FUEL SAFE GLO FUEL & GASOLINE SUGGESTED RETAIL $995 NOW JUST $750 ORDER FROM ACME PLASTIC PUMP CO P 0 BOX 24551 MINNEAPOLIS MN 55424 DEALER INQUIRIES INVITE) FILLS THE LARGEST MODEL FUEL TANKS IN SECONDS Krumpler/Irvine Continued page 157 loops deteriorating plane falling off top battery running down its time pian landing Spins require CG further back whit used initially removal two-ounce speed controller nose can get spin little power just top stall needs blast air across tail get going Stall turns easy Just go power push stick over Snap rolls level flight just easy Feed little Up elevator just see nose start rise pull stick right over full back zips right around actually pauses level flight before going spiral dive pause cue let go stick can make way down length field snapping 10 20 yards stall turn other end repeat comine other way glide moderate remember bi planes draggy better struts Nevertheless find biplane struts mildly offensive usually have Make first few approaches bat tery power left have option going around rumbling generally fly until detect slight drop power cut throttle come just last little bit reserve SCR cells have sharp discharge knee almost like running out fuel whereas SCs give about 30second warning airplane best calm weather steady breeze 1989 KRC Fun Fly quite windy varied constant fine Krumpler gusty flyable much fun best time have far has evening flying wind has dropped THE WIREMASTER TM bessderutcolter extra large handle bends 1/8-1/4 coils S/ 32-3116 music wire Wlre peep eliminated ANTI-KREEP WIRE LOCKTh free catalog also has hardware accessories JOM COMPANY 114 Washfrlgton T Dept Waukegan IL 60095 can shoot touch-and-go after another admiring set ting sun shines through covering put skis winter flying put Goldfire Flying qualities deterior ated slightly because extra drag weight skis nothing major Conclusion What might change sec ond Krumpler might shorten nose bit build straight wings ease ten dency towards nose-heaviness might turn something else air Krumpler has bit Tiger Moth itand little Bucker Jungmann well creative modeler might take few minor changes create nice small Scale Electric last point build Krum pler please send comments photo Martin Irvine 34 Beaver Crescent Kingston Ontario Canada K7M 7C 1 will answer correspondence would appreciate sending stamp RC Helicopters/Jolly Continued page 52 Concept 30 SX complete highperformance package expert fliers Kit Concept 30 SX arrived nicely packaged gold box vividly displaying SXs sleek lines lid slid off parts exposed evident Concept 30 SX pure Kyosho kit features excellent quality obvious thought put part SX shipped standard Concept struction manual two separate addendum sheets pertain specifically SX Kyosho understands multinational necessity clear pictures result manuals feature ex cellent illustrations just enough text take over rough spots standard Concept manual over 30 pages super piece work Anyone can build Concept merely looking pictures matching parts fas teners Concept 30 SX difficult assemble Following instructions letter took under seven hours start finish Youll have no problems Ill expand just briefly few steps feel may lacking text Step 11 Set clutch lining place glue thin CyA add glue first youll tiAWIUKUUKKILANE RAF WAS GLAD TO H4 YE t SPITFIRE RIJTITIA4D TO HAVE T pSIS 00 01501 Add Si 500 hEFIa Usa VISAs MC 015151050 015 COO Polyester HaM Laid Fibealaaa1/aS Soale Fuselage ngspan.50 noVas lete eels aod llardwaeFuse LengTh. 0353 lncttea Paclsages IndudadWeight.12 Lbs Meotrina Cut Foam Adog Cares Fonssr.2oy5OTs 108 Any 125 / Heavy Duty Styiene Clam Canopy1mm Legal / Flbertleas Cowl Fuse H Molded Stringers Easy RuildEsay Fly Esoellent Beginnem Waibjid SoossassIss AesHaWe 55550 reps s sed Fplns trawsa SeataTkea8t5jbs55alieht0tats IR5m5 5 LRta 054 Las 0th /S KIt AeettRhe Wue isa. a WutS leSs 750*5 Pes.ZeyW Ta toe Aan tss Jte Pun 551 a. P5351 P P-a ME-flOsS Nasmyx 1LU3Mesa Ms5oTan8 ml P5133 035331 l-amoaavImn never get lining belongs before sticks itself tableyou get pic ture step 13 main frame assembly call out 2 x 3 x 10mm-long self-tapping screws illustration shows could shorter hold cooling shroud place fact screws too long will bind up clutch bell step 19 tail rotor assembly make sure use plastic-compatible screw cement supplied kit good job tightening pitch ring nut slide bushing assembly could better designed allow positive grip during assembly would help ensure nut will separate bushing dur ing use step 21 dont glue new control rod sup ports place Instead decide go apply -in strip vinyl electrical trim tape boom Rub edges tape down well slide supports position twisting motion Youll find fit snugly removable can also put some tape boom under horizontal stabilizer help snug up step 31 installation canopy should use additional two screws front lower sides canopy keep decals lifting canopy front edge Id like add suggestions just no way intended detract Concept manual excellent build ing aid kit complete Concept yos would literally have try fail keep achieving success What radio Concept SX used Air tronics Vanguard six-channel FM system SGX gyro transmitter features dual rates elevator aileron has idle up setting pitch trim revolution mix throttle hold servo reversing switches todays standards Vanguard rates very basic heli system Unlike PCM 10 1024 hell pilots will able use everything Vanguard-type sys tem Its perfect beginner will per form contest system Novice Scale maybe far Intermediate since can per form upright maneuvers SGX system comes gyro mixer dedicated tail rotor servo features single adjustable gain reversing switch FAt caliber its perfect novice will want set gain up high authority adjust gyro suit taste pro gresses SGX will also find favor fixedwing tail-dragger pilots think its just ticket short-coupled Scale ship gets fe isty takeoff Check out couldnt easier install Vanguard performed admirably glitch think however suitable training SX will capable everything expert will want SX mind switched over Air tronics Spectra 7 PCM radio still pre microprocessor has enough bells whis tles allow competent pilot explore SXs inverted capabilities motivator power used standard 05 32 FSR H coupled Vortexs Eikohgiken C 30 muffler What can say about start idle produce lot powerall good things want heli motor C 30 seems help out power department has added advantage allowing adjust low idle mixture motor once course 162 Model Aviation Rubber ft Ongine Power Free Flight Display Control Line Eleotric Power RIC Airplenee new liluetrated 32 page tabloId size catalog US ft Canade $100 Foreigh $300 Penn Valley Hobby Center 837-A W Main St Lanadale PA 18446 215 368-0770 ZENOAH SACHS-DOLMAR & QUADRA ENGINES ERCOUPE TOMAHAWK & J-3 KITIEN KITS ZINGER & DYNATHRUST PROPS FUEL TANKS Carbon-Fiber Arrowahafte Ceconite & Glue DGA & MGA PILOTS Send $100 catalog JIM MESSERS QUALITY MODEL PRODUCTS Valley View Dr Box 43 Allegany NY 14706
Edition: Model Aviation - 1990/12
Page Numbers: 46, 47, 48, 49, 50, 51, 155, 156, 157, 162
NO OCR TEXT 1_ _ - iI-4La{ ______ tric-powered biplane looks like might actually have post-WW full-scale plane early homebuiltbut its Its entirely original design Build lot easy sport flying EMartin Irvine TWO WEEKS before 10th Annual KRC Electric Fun Fly found myself needing new airplane love NW biplanes course everyone knows Electric bipes require too much power overcome drag truly practical obvi ously have never seen Keith Shaws 60-size Stearman decided kept fuse lage fairly small number struts minimum should OKa nice slow flier What banged together two weeks what see test flew sun going down Friday September 15 11 hours before leave KRC meet Id like say flew right off board design ers have admit required three-fourths Right rudder two clicks Up elevator trim before flew straight Big deal thought amount rudder re quired because lack right thrust motor Small bipes often require sideand down-thrust haste forgot side-thrust tried model still required some right trim cant see warps anyway dont mind small amount trim down-thrust built way wing incidence 20 30 top bottom wings respectively sta bilizer incidence 2 O causes air plane fly slight downward angle ef fectively giving down-thrust flew number flights KRC meet terrific weekend anyone inter ested Electrics should attend least once got requests plans five people made think might have wider appeal article re sult specification table will tell what might want know about Krumpler just couple ad ditional notes needed first used DSC 075 motor sim ilar 075/550-size motors current generation complete kit Electric trainers sport planes bat tery pack Sanyo seven-cell 9005CR pack prop used Taipan 8 x 4 combination motor draws 19 amps calculates total power put 130 watts think airplane needs seven-cell pack use 550-type motor want reliable takeoffs grass Although can done six cells marginal much fun remotored Great Planes Goldfire motor has much poop usual 550 course ex pense much higher current over 30 amps current-limiting STW speed con troller wouldnt let 26 amps get through flight times short absurd tried Futaba MCR 4A re ceiver great success able use six-cell packs am getting ahead myself Lets build first Construction Wings make plywood master rib cut ribs sharp No11 blade center section ribs just trim A6 off top bottom surfaces Decide what size spars want make spar cut outs suit used /8 x /16 basswood spars rather uncommon sizeso might use /8 x bass spruce Don t use balsa spars wont strong weight saving would negligible Use medium weight straight-grained balsa rest wing dihedral brace ply goes between spars does shear webbing Dont leave webbing out weighs little adds lot stren2th can build either top lower wing first will constructed panel time Start laying down lower spar trailing edge Place ribs position angling root rib bit dihe dral add top spar dry ie no glue Eyeball everything assure straight use thin CyA glue things solid Add leading edge being careful shim up lined up top bottom ribs Glue wing tip pieces add vertically grained shear webbing between spars braced trailing edge gussets Now build other wing panel youre finished cut slot root ribs dihedral brace December 1990 47 No havent just landed underside view shows slight wing sweep generous tail mo ment translucent covering Barely visible fuse mount ahead lower wing cen ter section Bottom hatch Balsa rails keep motor pack seven 900SCRs centered Note wire yoke rear No 64 elastic 3A-ln dowel acts forward battery hold-down point Everythings mounted hatch base Yoke held CyA has stood some unexpected arrivals four notches sides clear cabane struts Join two halves epoxy have time make adjustments suring have correct dihedral inch side top wing 1 /2 side bottom wing Next A-in center section trailing edge piece can shaped added can leading edge A-in piece Glue center section sheet Keep mind spars flush covering dont sheet over strut fittings made A-in sheet notched interplane struts backed / ply just buttglued side ribs strong enough struts weaker wing structure will knock out break before damaging wing experience speaks Brace rear fitting %-in sq flush covering surface other wing built exactly same way Tail The stabilizer needs no explanation fin rudder built using old Free Flight technique called laminating Its easy strong looks great First cut A-in balsa blank form inside line fin rudder Dont bother wax anything Next cut seven strips soft A2 x x 24in balsa additional strip little wider Pin form down surface covered waxed paper Stack strips together using pins hold things place wrap around form slightly wider strip should inside next form use little tension pull ing strips around will find dry wood bends quite easily Once strips pinned place push laminations down flush build ing surface Now use thin CyA glue everything solid being careful get glue form slightly wider piece placed against form acts dam stop CyA sticking lam inations form Once glue has set unpin outline tum over CyA other side stack has set gently spring outline open will quickly see lam inations need glue Now thumbtack sheet fine sandpaper 48 Model Aviation Lower wing cutout radio bay has enough room lot Two 51338 right receiver battery pack sit middle Note mounted balsa floor grain across fuselage Minimal foam needed because lack vibra tion some should used protection rough landings fuselage holder on/off switch ahead wIng Construction wing outlined article Top view nose sans hatch Note side thrust DSC 075 motor Looks snug everything fits fairly easily bottom STW Sommeraur MK3 speed controller motor/controller connectors top Loose set connectors battery pack tached underside hatch XLR *8RL w/PLS I9ARTJNIRVINE 4 BRLRRj8& g Q8EL&R 6LFU- x -4 tic WfRE 4 8nL~ \\ Q N Cl 16 o5Q B l-OMERcN8 075 M0rc N 11~~~ 0 0fif i 0ji~MRIRVJNE 0 fl-VINe 51YI 0 TW PLANL OL BUDDr5HEFT IA UC NOj- VNCflcJLRUT INSIDE NDRINJNG S7Rflh ToPUJ1Io~JTH WIN& N 4BAL8R&HErT Q Q TE flat surface carefully sand out line smooth find works best hold under extended fingers sand cir cular motion Once reasonably smooth pin plan add other pieces trimming outline leave leading edge little long can act key rear fuselage upper surface Now can cut rudder free think will pleasantly surprised strong structure Fuselage Construct both basic sides 3/ square sheet best second side constructed over first small pieces wax paper glue joints pre vent two sides sticking together Note right side shorter left give built-in side thrust cabane struts will glued slotted balsa pieces fuselage Dry fit pieces groove accept 1/16 spring steel cabane wires before glu ing place Make sure slots inside surface fuselage Groove upper longerons accept cabanes add A6 sheet doubler inside both sides Note does run full length nose stops short motor bulkhead provide slot its insertion later Fill ward two bays /16 sheet Now add / x 3A6-in strips tail end let A6 sheet outside edge course time being care ful build right left sidearent assemble basic fuselage put gether upside down forward upper longerons flat against building board temporary Y6-in -sq crosspiece forward cabane mount permanent ones rear battery hatch leading trailing edges wing Now have basic box should square angles Check redo necessary cant expect plane fly straight looks like should have Chi quita painted side Once straight pull forward fuse lage together install motor bulk head Next draw rear fuselage together tail join checking straight ness Add remaining /l6 cross pieces Next bend landing gear sew landing gear bulkhead wire Spread epoxy glue over sewn joint glue assembly position fuselage doing might want temporarily attach lower wing check level rear fuselage has piece A-in sheet set between upper rear longe rons act base fin left leading edge fin little long can cut slot forward edge piece accept Dont add tail skid yet easier after have cov ered fuselage Now can add rear turtledeck form ers Cut slot center A6 x A-in stringer top center former Ad just things until stringer straight level glue place Next using straightedge very sharp blade cut slots other two stringers side equidistant center stringer upper longeron three stringers end up being flush last crosspiece just ahead fin Add diagonal bracing top bottom first add side bracing lower cowl sheeting should added yet Now get hatch Hold piece A-in sheet top trace along inside upper longerons Cut A-in sheet out leaving line Next carefully break out temporary crosspiece glued across forward center section struts landing gear bulkhead helps hold sides apart now Carefully sand hatch base until snug tight fit Glue formers place add sheeting two halves front back Now add side pieces easier add after adding sheeting before Trim cockpit outline notch sides cabane struts Add lower cowling A6 sheet wing dowels bits pieces nose Round off make nose look little like radiator Now its done Radio power installation found Continued page 155 Lower end interpiane struts Diagonal bracing apar rib iooka fiimsy Strut piastic straw roughiy-shapod balsa strip inside Wing hoids place appearance oniy Laminated outline technique fin rudder illustrated right Straight pieces brace outline against warping Rudder pushrod longer ideal because tight rear fuselage Note links use tubing keeper 50 Model Aviation Lower rear fuselage Simple tall skid dowel quite strong Note small brass locknut backing Quick Link Its railroad supplier Looks neat Dont overtighten youll weaken brass coupler fly off pavement consider using wire tall skid run antenna fin top 1116 PLYWOOD TOP WING 1/16 PLYWOOD ING DIHEDRAL BRACES DIHEDRAL- UPPER WING HERE AT EACH TIP BALSATWO STRIPS OF lAB I/B__________________ I/B3/16BASSWOOD3/161/4BALSAFILLPLY UNDERSIDE OF UPPER SPARS TOP 6 BOTTOMLEADING EDGE___________________ 1/16 BALSA SHEET 1/16 BALSA WEBTOPS BOTTOM BOTH 3/4 3/16 BALSA GRAINWINGS TRAILING EDGE R-3 BALSA FILL3/IA 1/4 BALSA LEADING EDGE 1/4 BALSA WITH _____1/64 PLY BACKING N-I N-I\WING STRUT N-S ____ N-Gil1SLOT 3/6 BALSA BALSA F-I R-26-3TRAILING EDGE F-2 B F-3HATCH EDGE I/B A SHEET~i3/43/IRTE -HATCH BASE6-I DIG MWCOT /16 WIDE SLOT WING DETAIL F-43/lA BALSA1/16IN RI AETER ASSEMA SHEETWING NAILS F51A6BALSA I/IA DIG MUSIC I: SHEETWINE CABANE F-6G-V4 3/IA SONOTE U I/IA BALSA SHEET DGUBLFR WITH LIGHTBHG HOLES 3/16 1/2 BALSA I/A 5/16 BALSA GROOVED FOR HATCH EDGE- SEECABANE3/16 50 AA5A F- CROSS SECT I/IA I/B PLY GI/4LONGTO F-4SA7 -- - --- 2 INCIDESCE I/B PLYWOOD OPTIONAL-MOTOR 3/IA SO BALSA UPRIGHT B CROSS PIECES MOTOR MOUNTSHEET ELS-WILLIAMS ELAGE SIDE VIEW /BROS ON DAVE 3/32 DIG MUSE WINEBROWN WHEELS LEAVE THE BOTTOM OF LAST I/IA BALSA SHEET FLUSH WITH OUTER EDGE WING SPAN WING AREA ELECTRIC MOTOR BATTERY PACK PROP SPECIFICATIONS I/N I6 BALSA STRINGER TYPICAL DIHEDRAL LOWER WINGI_ EACH TIP Il/B PLY 0 HEORAL BRACE 3/16 50 BALSA tB 3/16 50 BALSA 3/16 BALSA SHEET STAB 3/IA S/B BALSA 3/IA 1/3 BALSA 3/16 SQ BALSA HINGE TO SUIT C ELEV I/B PLYWOOD 3/32 DIG LANDING GEARMUSIC WINE SEE CONSTRUCTION DETAIL FRONT REAR I/A DIA MUSIC WIRE NOTCH TO GIVE CABANEEPOXY GRIP hPATTERN 0I23456 MODEL AVIATION KRUMPLER DESIGNED BY MARTIN IRVINE 39-I/U 500 55 IN SAC 075 SANYO 7 CELLTRACING BY 30E DEMARCO TAIPAN 5 4 RIGHTS RESERVED 0 0 I0 0 CD 0 CD 2 0 CD -I -L Co 0 0 U World Engines$25-$35 72 MHz NB receivers offered RCD types $6995 Other 27 50 53 72 75 MHz com plete RC service Speed controls chargers repaired P & H $5-$lO Tim Abrens/Aero Electronics 127 Route 6 Box 54J Austin TX 78737 72 MHz transmitters serviced Ace RC Futaba FM sticker$10 AM conversion $15 Alignment plus crystals$40-$5O Other 27 50 75 MHz bands ser viced Custom applications Ni-Cd peak detector chargers P & H $6-$9 Authorized RC Service 128 327 South Stage Coach Lane Fallbrook CA 92028 tel 1-601/728-0440 Open Wed nesday Thursday Friday Saturday 10 am-230 pm 72 MHz transmitters serviced Ace Air tronics Cannon Cox Futaba Hobby Shack Kraft Pro-Line others 72 MHz receivers offered RCD $6995 plus crystal$695 Ace$75$115 P & H $5-$8 Bill Slayton 129 1005 Phillips Drive Dumas TX 79029 E L Lltchfield 130 4707 Woodside Manor Tampa Fl 33624 tel 1-813/8785382 Peter Calvagna 131 1092 Becker School Rd Freeport IL 61032 Thomas Albrlght 132 7303 Stony Hill Rd Wake Forest NC 27587 Krumpler/Irvine Continued page 50 Krumpler threatening end up nose heavy put motor battery aft end hatch Two Y6-sq strips glued bottom hatch spac ing equal width power pack pack rested between Next wire yoke glued rear hatch angled dowel added forward end battery placed between wood strips held place #64 rubberband stretched between yoke dowel first time have used technique works well shall use again makes battery access easy hatch itself held #32 rubberband looped over hatch forward wing dowels Its crude effec tive going use MCR 4A re ceiver add cooling scoops sides nose top hatch will help keep receivers MOSFETs metal oxide-semiconductor field-effect transis torsEd cool efficient kept way Servos mounted far back possi ble put cross sheet /16 below bat tery pack placed receiver initially midsized FMlO7N its battery pack 5R300 mAh between lower wing speed controller Sommerauer Mk 3 25-amp 6- 14-cell unit under motor current-limiting de sign installed fuse under cowling anyway first saw particular arrangement issue newsletter Electric Model Flyers Southern Ontario EMF SO Two Sermos connector housings glued together piece /16 ply tween two small pieces /32 ply AEROMODEL GIANT SHARK ARC PRE-BUILT 0 SHARK $21495 SEE YOUR HOBBY DEALER EIRST SEND STAMPED #10 ENVELOPE POR INFO KINGS WAY RIG HOBBY SUPPLY 5559 RICHMOND HOUSTON TX 77056 DEALERS ONLY 1-800-621-7783 December 1990 155 Sound Supression Oesign High Thrust Efficiency Long Fiber Advanced Composite Material Proven Performance US Masters US Nation als Canadian Nationals World Champion ships Spoits Sizes 57x3 7x3 7x4 7x5 7x6 7x7 7x8 7x9 7x10$159EACH 8x4 8x5 BxB 8x7 8x8 SxS BxlO $179 EACH 9x4 9x5 9x6 9x7 9x8 9x9 9x10 $199 EACH 95x45 10x6 lOx 7 10x8 10x9 lOx 10 $229 EACH 11 xB 11 x7 11 xB 11 x9 12x6 12x7 12x8 ..$289EACH Competition 11 xlO 11 xli 11 x12 11 xl2W 11 x13 11 x14 12x9 12x9W12x10 l2xlOW 12x11 l2xllN 12x 12 12x12N 12x 13 12x13N 12x14 $795 EACH 135 x 125 135 x 14 14 x8 14x 10 14x 12 14x 14 144 x 105 144 x 12 $1295 EACH Contact local hobby dealer Manufactured Landing Products Knights Landing California glued inside housings order put contact under pressure assembly glued A2-in mounting plate turn mounted aircraft nice part about have fused system safety can use arming switch removing replacing fuse Off might want attach fuse airframe short length cord dont lose have used system number models though speed controller limits amperage fully stalled motor fuse doesnt blow al though certainly will control ler Later changed radio Futaba Electric radio MCR 4A receiver dropped weight about four oun ces sneezed Graupner 8 x 4 prop seven 900SCR Ni-Cd cells motor Goldfire now draws over 30 amps according DSC ammeter original current-limiting STW control ler wouldnt pass 26 amps amounts input over 200 wattsor about 100 watts per pound model weight Rocket-propelled biplanes cup tea substituted six-cell l200SC pack dropped peak current freshly charged pack 27 amps 162 watts still potent combination has poop original setup Interestingly requires side thrust before may due fact removal two-ounce speed controller nose aircraft moved CG aft bit made controls little sensitive added air scoops made plastic spoons nose increase airflow over MCR 4As MOSFETs con troller isnt supposed handle current magnitude However have run set seven 900SCRs down just cool ing see photos using Graupner 8 x 4 prop 30-plus amps ini tially shut down after 105 sec let cool got just 15 sec Therefore would guess would have worked air adding scoops much better MOSFETs As now land can feel MOS FETs cool touch remove battery pack have heard people having difficulty radios such shutting down motor too soon being able handle 15 amps Another local flier has similar results both MCR 4A units think troubles other people have must defec tive units some other installation problem complaint radio 50-Hz controller isnt very good fer rite motors time magnets will lose power sounds slightly rough lower throttle settings right applica tion think great little rig Certainly have respect now know what can Its keeper MtCfled Performance system TOP PERFORMANCE K&B ENGINES AirplaneMarine K&B FUELS K&B GLOW PLUGS 9 Blends4 Chsices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B Micro-Bailsons FILLtR K&B SUPER FOXY RESIN K&B THINNER K&B SUPER POXY PRIMER K&P IIPPR pesy PaINT note wiring connectors may order Use good stuff Cheap power systems need best expensive sys tems deserve have standardized con nectors sold Sermos same Anderson Power Poles available Hobby Horn Sermos Jomar SR number other Electric suppliers best avallable Similarly use specialty wire same suppliers youre sure something phone will help out right over phone object using wire minimize losses electrical system Theres no point wasting power dont need cost best especially compared cost airplane very small Covering Any iron-on film market will work well aircraft because strength wing thanks hard wood spars covered entire airframe lightest Coverite Micafilm V ozIyd us ing Balsarite adhesive find clear easier put colored gives airplane clear-doped tissue look also shows off construction rather well provides incentive good work careful adhere covering rib spar extra strength imparts can trim film wish over 156 Model Aviation 555 APCJ APC PROPELLERS CULPEPPEE C MODELS INC 2526 Washington DubuqueIA 52W1 31915334839 Micaflim Assembly Glue wing hold-down dow els rubberband bottom wing position Next slide formed center sec tion struts place Lift out Ae-dia holes fuselage until top wing sits indicated angle inci dence Robart incidence meter works well Remove make sure free surface oil grease notched provide good grip glue Smear slow-setting epoxy drip some holes reassemble Again check angle incidence checking upper lower wing tips same distance apart satisfied let set overnight Now top cross pieces bent bound center section struts soldered Ply wood strips used provide bearing sur faces positive location keying wing glued top wing cut ting away some film ensure ade quate adhesion used quite crude locat ing system because tight schedule building model plan shows abet ter can add some balsa strips simulate scalelike struts make sure wont foul battery hatch wing attachment finished care fully glue stab fin place making sure straight used Sig CA hinges original Williams Bros 2-in wheels used undercarriage About time tail skid can added nonfunctional interplane struts made slightly rounded /t6 balsa inside large plastic drinking straws de signed held place wing ten sion meant come out break before wing damaged case hard landing hitting something Now can balance airplane best procedure try move things around inside necessary achieve cor rect balance rather adding balance weights following summary originals weights 1 oz grams Top wing complete uncovered46 gm Balsarite adhesive3 gm Covered54 gm Covered lettered59 gm Bottom wing 3 grams less Fuselage complete dowels cabane wires landing gear no pushrods wheels cabane cross wiresun covered78 gm Balsarite adhesive2 gm Covered83 gm Stabilizer elevator uncovered 8 gm Coveredil gm Fin rudder uncovered4 gm CoveredS gm Total airframe12 oz Radio weight75 oz later MCR 4A RX35 oz SEE YOUR DEALER OR ORIER DIRECT PLEASE ENTER MY ORDER FORFUEL WJZZARDS AT $ 750 EACh POSTAGE PAID NAMESTREET_______________________ CITYSTATE_______________ ZIP_________ Motor weight connectors prop adapter9 oz Battery weight connectors 7 x 900SCRlO5 oz 6 x 12005CRuS oz Total flying weight STW reg ular radio 7 x 900s39 oz Total flying weight MCR 4A ra dio 6 x 1200s36 oz Flying As stated introduction original Krumpler required Right little Up trim Level flight maintained throttle quick takeoffs aer obatics require full nearly full throttle landing gear fairly far forward have ready correct swing takeoff isnt hard So far have ground looped Krumpler once its test flight before knew much right trim would neces sary takes off less 50 ft no wind less breeze keep flat after breaks ground gain little speed before start pulling much elevator Keep first flight two gentle until have feel airplane Later can throw around rudder throw quite sufficient elevator figure eights very small area Loops fairly straightforward require either nearly-full power lit tle dive first better wind Continued page 162 NOWATWO TAPE SET tape youve waiting finally herell youre new bobby just want learn secret wood plane construction YOU PLANE VIDEO Presents BUILDING IT RIGHT THE FIRST TIME FIRST NO-NONSENSE VIDEO OF WOOD AIRCRAFT CONSTRUCTION APPROX 4 HOURS ON eFuel tank installation eNew engine setup 0 Fuselage construction OBUILDING STRAIGHT C Installing pushrods C Covering film C Eliminating warps e Aligning Salancing C Final checkout ePLUS MUCH MORE! Radio installation Straight wing building Installing hinges C Shear webbing Applying PG cloth S Servo installation Setting up new radio Dozens building tips Slab tall surfaces Aileron installation CREDIT CARD CUSTOMERS Use toll free number place order Have VIS4 MasterCard VISA ready calI.24HR5 DAY OR mail $3495 S & H Iforelge orders add $800 5/H PLANE VIDEO terCaPO Box 23128 Cliv Iowa 50325 Iowa residents add 4%sales tax PLAN vicevanG1Ou1LO 7 fliuvYti FREEI800I 38382 5VTOLL FREE 24HR24HR OR 5151223-0897 December 1990 157 FUEL WIZZARD THE WORLDS FASTEST AND MOST CONVENIENT FUEL PUMP EVER * FITS ALL GALLON FUEL BOTTLES * FAST ONE STROKE LL OUNCE OF FUEL * ALL FUEL SAFE GLO FUEL & GASOLINE SUGGESTED RETAIL $995 NOW JUST $750 ORDER FROM ACME PLASTIC PUMP CO P 0 BOX 24551 MINNEAPOLIS MN 55424 DEALER INQUIRIES INVITE) FILLS THE LARGEST MODEL FUEL TANKS IN SECONDS Krumpler/Irvine Continued page 157 loops deteriorating plane falling off top battery running down its time pian landing Spins require CG further back whit used initially removal two-ounce speed controller nose can get spin little power just top stall needs blast air across tail get going Stall turns easy Just go power push stick over Snap rolls level flight just easy Feed little Up elevator just see nose start rise pull stick right over full back zips right around actually pauses level flight before going spiral dive pause cue let go stick can make way down length field snapping 10 20 yards stall turn other end repeat comine other way glide moderate remember bi planes draggy better struts Nevertheless find biplane struts mildly offensive usually have Make first few approaches bat tery power left have option going around rumbling generally fly until detect slight drop power cut throttle come just last little bit reserve SCR cells have sharp discharge knee almost like running out fuel whereas SCs give about 30second warning airplane best calm weather steady breeze 1989 KRC Fun Fly quite windy varied constant fine Krumpler gusty flyable much fun best time have far has evening flying wind has dropped THE WIREMASTER TM bessderutcolter extra large handle bends 1/8-1/4 coils S/ 32-3116 music wire Wlre peep eliminated ANTI-KREEP WIRE LOCKTh free catalog also has hardware accessories JOM COMPANY 114 Washfrlgton T Dept Waukegan IL 60095 can shoot touch-and-go after another admiring set ting sun shines through covering put skis winter flying put Goldfire Flying qualities deterior ated slightly because extra drag weight skis nothing major Conclusion What might change sec ond Krumpler might shorten nose bit build straight wings ease ten dency towards nose-heaviness might turn something else air Krumpler has bit Tiger Moth itand little Bucker Jungmann well creative modeler might take few minor changes create nice small Scale Electric last point build Krum pler please send comments photo Martin Irvine 34 Beaver Crescent Kingston Ontario Canada K7M 7C 1 will answer correspondence would appreciate sending stamp RC Helicopters/Jolly Continued page 52 Concept 30 SX complete highperformance package expert fliers Kit Concept 30 SX arrived nicely packaged gold box vividly displaying SXs sleek lines lid slid off parts exposed evident Concept 30 SX pure Kyosho kit features excellent quality obvious thought put part SX shipped standard Concept struction manual two separate addendum sheets pertain specifically SX Kyosho understands multinational necessity clear pictures result manuals feature ex cellent illustrations just enough text take over rough spots standard Concept manual over 30 pages super piece work Anyone can build Concept merely looking pictures matching parts fas teners Concept 30 SX difficult assemble Following instructions letter took under seven hours start finish Youll have no problems Ill expand just briefly few steps feel may lacking text Step 11 Set clutch lining place glue thin CyA add glue first youll tiAWIUKUUKKILANE RAF WAS GLAD TO H4 YE t SPITFIRE RIJTITIA4D TO HAVE T pSIS 00 01501 Add Si 500 hEFIa Usa VISAs MC 015151050 015 COO Polyester HaM Laid Fibealaaa1/aS Soale Fuselage ngspan.50 noVas lete eels aod llardwaeFuse LengTh. 0353 lncttea Paclsages IndudadWeight.12 Lbs Meotrina Cut Foam Adog Cares Fonssr.2oy5OTs 108 Any 125 / Heavy Duty Styiene Clam Canopy1mm Legal / Flbertleas Cowl Fuse H Molded Stringers Easy RuildEsay Fly Esoellent Beginnem Waibjid SoossassIss AesHaWe 55550 reps s sed Fplns trawsa SeataTkea8t5jbs55alieht0tats IR5m5 5 LRta 054 Las 0th /S KIt AeettRhe Wue isa. a WutS leSs 750*5 Pes.ZeyW Ta toe Aan tss Jte Pun 551 a. P5351 P P-a ME-flOsS Nasmyx 1LU3Mesa Ms5oTan8 ml P5133 035331 l-amoaavImn never get lining belongs before sticks itself tableyou get pic ture step 13 main frame assembly call out 2 x 3 x 10mm-long self-tapping screws illustration shows could shorter hold cooling shroud place fact screws too long will bind up clutch bell step 19 tail rotor assembly make sure use plastic-compatible screw cement supplied kit good job tightening pitch ring nut slide bushing assembly could better designed allow positive grip during assembly would help ensure nut will separate bushing dur ing use step 21 dont glue new control rod sup ports place Instead decide go apply -in strip vinyl electrical trim tape boom Rub edges tape down well slide supports position twisting motion Youll find fit snugly removable can also put some tape boom under horizontal stabilizer help snug up step 31 installation canopy should use additional two screws front lower sides canopy keep decals lifting canopy front edge Id like add suggestions just no way intended detract Concept manual excellent build ing aid kit complete Concept yos would literally have try fail keep achieving success What radio Concept SX used Air tronics Vanguard six-channel FM system SGX gyro transmitter features dual rates elevator aileron has idle up setting pitch trim revolution mix throttle hold servo reversing switches todays standards Vanguard rates very basic heli system Unlike PCM 10 1024 hell pilots will able use everything Vanguard-type sys tem Its perfect beginner will per form contest system Novice Scale maybe far Intermediate since can per form upright maneuvers SGX system comes gyro mixer dedicated tail rotor servo features single adjustable gain reversing switch FAt caliber its perfect novice will want set gain up high authority adjust gyro suit taste pro gresses SGX will also find favor fixedwing tail-dragger pilots think its just ticket short-coupled Scale ship gets fe isty takeoff Check out couldnt easier install Vanguard performed admirably glitch think however suitable training SX will capable everything expert will want SX mind switched over Air tronics Spectra 7 PCM radio still pre microprocessor has enough bells whis tles allow competent pilot explore SXs inverted capabilities motivator power used standard 05 32 FSR H coupled Vortexs Eikohgiken C 30 muffler What can say about start idle produce lot powerall good things want heli motor C 30 seems help out power department has added advantage allowing adjust low idle mixture motor once course 162 Model Aviation Rubber ft Ongine Power Free Flight Display Control Line Eleotric Power RIC Airplenee new liluetrated 32 page tabloId size catalog US ft Canade $100 Foreigh $300 Penn Valley Hobby Center 837-A W Main St Lanadale PA 18446 215 368-0770 ZENOAH SACHS-DOLMAR & QUADRA ENGINES ERCOUPE TOMAHAWK & J-3 KITIEN KITS ZINGER & DYNATHRUST PROPS FUEL TANKS Carbon-Fiber Arrowahafte Ceconite & Glue DGA & MGA PILOTS Send $100 catalog JIM MESSERS QUALITY MODEL PRODUCTS Valley View Dr Box 43 Allegany NY 14706
Edition: Model Aviation - 1990/12
Page Numbers: 46, 47, 48, 49, 50, 51, 155, 156, 157, 162
NO OCR TEXT 1_ _ - iI-4La{ ______ tric-powered biplane looks like might actually have post-WW full-scale plane early homebuiltbut its Its entirely original design Build lot easy sport flying EMartin Irvine TWO WEEKS before 10th Annual KRC Electric Fun Fly found myself needing new airplane love NW biplanes course everyone knows Electric bipes require too much power overcome drag truly practical obvi ously have never seen Keith Shaws 60-size Stearman decided kept fuse lage fairly small number struts minimum should OKa nice slow flier What banged together two weeks what see test flew sun going down Friday September 15 11 hours before leave KRC meet Id like say flew right off board design ers have admit required three-fourths Right rudder two clicks Up elevator trim before flew straight Big deal thought amount rudder re quired because lack right thrust motor Small bipes often require sideand down-thrust haste forgot side-thrust tried model still required some right trim cant see warps anyway dont mind small amount trim down-thrust built way wing incidence 20 30 top bottom wings respectively sta bilizer incidence 2 O causes air plane fly slight downward angle ef fectively giving down-thrust flew number flights KRC meet terrific weekend anyone inter ested Electrics should attend least once got requests plans five people made think might have wider appeal article re sult specification table will tell what might want know about Krumpler just couple ad ditional notes needed first used DSC 075 motor sim ilar 075/550-size motors current generation complete kit Electric trainers sport planes bat tery pack Sanyo seven-cell 9005CR pack prop used Taipan 8 x 4 combination motor draws 19 amps calculates total power put 130 watts think airplane needs seven-cell pack use 550-type motor want reliable takeoffs grass Although can done six cells marginal much fun remotored Great Planes Goldfire motor has much poop usual 550 course ex pense much higher current over 30 amps current-limiting STW speed con troller wouldnt let 26 amps get through flight times short absurd tried Futaba MCR 4A re ceiver great success able use six-cell packs am getting ahead myself Lets build first Construction Wings make plywood master rib cut ribs sharp No11 blade center section ribs just trim A6 off top bottom surfaces Decide what size spars want make spar cut outs suit used /8 x /16 basswood spars rather uncommon sizeso might use /8 x bass spruce Don t use balsa spars wont strong weight saving would negligible Use medium weight straight-grained balsa rest wing dihedral brace ply goes between spars does shear webbing Dont leave webbing out weighs little adds lot stren2th can build either top lower wing first will constructed panel time Start laying down lower spar trailing edge Place ribs position angling root rib bit dihe dral add top spar dry ie no glue Eyeball everything assure straight use thin CyA glue things solid Add leading edge being careful shim up lined up top bottom ribs Glue wing tip pieces add vertically grained shear webbing between spars braced trailing edge gussets Now build other wing panel youre finished cut slot root ribs dihedral brace December 1990 47 No havent just landed underside view shows slight wing sweep generous tail mo ment translucent covering Barely visible fuse mount ahead lower wing cen ter section Bottom hatch Balsa rails keep motor pack seven 900SCRs centered Note wire yoke rear No 64 elastic 3A-ln dowel acts forward battery hold-down point Everythings mounted hatch base Yoke held CyA has stood some unexpected arrivals four notches sides clear cabane struts Join two halves epoxy have time make adjustments suring have correct dihedral inch side top wing 1 /2 side bottom wing Next A-in center section trailing edge piece can shaped added can leading edge A-in piece Glue center section sheet Keep mind spars flush covering dont sheet over strut fittings made A-in sheet notched interplane struts backed / ply just buttglued side ribs strong enough struts weaker wing structure will knock out break before damaging wing experience speaks Brace rear fitting %-in sq flush covering surface other wing built exactly same way Tail The stabilizer needs no explanation fin rudder built using old Free Flight technique called laminating Its easy strong looks great First cut A-in balsa blank form inside line fin rudder Dont bother wax anything Next cut seven strips soft A2 x x 24in balsa additional strip little wider Pin form down surface covered waxed paper Stack strips together using pins hold things place wrap around form slightly wider strip should inside next form use little tension pull ing strips around will find dry wood bends quite easily Once strips pinned place push laminations down flush build ing surface Now use thin CyA glue everything solid being careful get glue form slightly wider piece placed against form acts dam stop CyA sticking lam inations form Once glue has set unpin outline tum over CyA other side stack has set gently spring outline open will quickly see lam inations need glue Now thumbtack sheet fine sandpaper 48 Model Aviation Lower wing cutout radio bay has enough room lot Two 51338 right receiver battery pack sit middle Note mounted balsa floor grain across fuselage Minimal foam needed because lack vibra tion some should used protection rough landings fuselage holder on/off switch ahead wIng Construction wing outlined article Top view nose sans hatch Note side thrust DSC 075 motor Looks snug everything fits fairly easily bottom STW Sommeraur MK3 speed controller motor/controller connectors top Loose set connectors battery pack tached underside hatch XLR *8RL w/PLS I9ARTJNIRVINE 4 BRLRRj8& g Q8EL&R 6LFU- x -4 tic WfRE 4 8nL~ \\ Q N Cl 16 o5Q B l-OMERcN8 075 M0rc N 11~~~ 0 0fif i 0ji~MRIRVJNE 0 fl-VINe 51YI 0 TW PLANL OL BUDDr5HEFT IA UC NOj- VNCflcJLRUT INSIDE NDRINJNG S7Rflh ToPUJ1Io~JTH WIN& N 4BAL8R&HErT Q Q TE flat surface carefully sand out line smooth find works best hold under extended fingers sand cir cular motion Once reasonably smooth pin plan add other pieces trimming outline leave leading edge little long can act key rear fuselage upper surface Now can cut rudder free think will pleasantly surprised strong structure Fuselage Construct both basic sides 3/ square sheet best second side constructed over first small pieces wax paper glue joints pre vent two sides sticking together Note right side shorter left give built-in side thrust cabane struts will glued slotted balsa pieces fuselage Dry fit pieces groove accept 1/16 spring steel cabane wires before glu ing place Make sure slots inside surface fuselage Groove upper longerons accept cabanes add A6 sheet doubler inside both sides Note does run full length nose stops short motor bulkhead provide slot its insertion later Fill ward two bays /16 sheet Now add / x 3A6-in strips tail end let A6 sheet outside edge course time being care ful build right left sidearent assemble basic fuselage put gether upside down forward upper longerons flat against building board temporary Y6-in -sq crosspiece forward cabane mount permanent ones rear battery hatch leading trailing edges wing Now have basic box should square angles Check redo necessary cant expect plane fly straight looks like should have Chi quita painted side Once straight pull forward fuse lage together install motor bulk head Next draw rear fuselage together tail join checking straight ness Add remaining /l6 cross pieces Next bend landing gear sew landing gear bulkhead wire Spread epoxy glue over sewn joint glue assembly position fuselage doing might want temporarily attach lower wing check level rear fuselage has piece A-in sheet set between upper rear longe rons act base fin left leading edge fin little long can cut slot forward edge piece accept Dont add tail skid yet easier after have cov ered fuselage Now can add rear turtledeck form ers Cut slot center A6 x A-in stringer top center former Ad just things until stringer straight level glue place Next using straightedge very sharp blade cut slots other two stringers side equidistant center stringer upper longeron three stringers end up being flush last crosspiece just ahead fin Add diagonal bracing top bottom first add side bracing lower cowl sheeting should added yet Now get hatch Hold piece A-in sheet top trace along inside upper longerons Cut A-in sheet out leaving line Next carefully break out temporary crosspiece glued across forward center section struts landing gear bulkhead helps hold sides apart now Carefully sand hatch base until snug tight fit Glue formers place add sheeting two halves front back Now add side pieces easier add after adding sheeting before Trim cockpit outline notch sides cabane struts Add lower cowling A6 sheet wing dowels bits pieces nose Round off make nose look little like radiator Now its done Radio power installation found Continued page 155 Lower end interpiane struts Diagonal bracing apar rib iooka fiimsy Strut piastic straw roughiy-shapod balsa strip inside Wing hoids place appearance oniy Laminated outline technique fin rudder illustrated right Straight pieces brace outline against warping Rudder pushrod longer ideal because tight rear fuselage Note links use tubing keeper 50 Model Aviation Lower rear fuselage Simple tall skid dowel quite strong Note small brass locknut backing Quick Link Its railroad supplier Looks neat Dont overtighten youll weaken brass coupler fly off pavement consider using wire tall skid run antenna fin top 1116 PLYWOOD TOP WING 1/16 PLYWOOD ING DIHEDRAL BRACES DIHEDRAL- UPPER WING HERE AT EACH TIP BALSATWO STRIPS OF lAB I/B__________________ I/B3/16BASSWOOD3/161/4BALSAFILLPLY UNDERSIDE OF UPPER SPARS TOP 6 BOTTOMLEADING EDGE___________________ 1/16 BALSA SHEET 1/16 BALSA WEBTOPS BOTTOM BOTH 3/4 3/16 BALSA GRAINWINGS TRAILING EDGE R-3 BALSA FILL3/IA 1/4 BALSA LEADING EDGE 1/4 BALSA WITH _____1/64 PLY BACKING N-I N-I\WING STRUT N-S ____ N-Gil1SLOT 3/6 BALSA BALSA F-I R-26-3TRAILING EDGE F-2 B F-3HATCH EDGE I/B A SHEET~i3/43/IRTE -HATCH BASE6-I DIG MWCOT /16 WIDE SLOT WING DETAIL F-43/lA BALSA1/16IN RI AETER ASSEMA SHEETWING NAILS F51A6BALSA I/IA DIG MUSIC I: SHEETWINE CABANE F-6G-V4 3/IA SONOTE U I/IA BALSA SHEET DGUBLFR WITH LIGHTBHG HOLES 3/16 1/2 BALSA I/A 5/16 BALSA GROOVED FOR HATCH EDGE- SEECABANE3/16 50 AA5A F- CROSS SECT I/IA I/B PLY GI/4LONGTO F-4SA7 -- - --- 2 INCIDESCE I/B PLYWOOD OPTIONAL-MOTOR 3/IA SO BALSA UPRIGHT B CROSS PIECES MOTOR MOUNTSHEET ELS-WILLIAMS ELAGE SIDE VIEW /BROS ON DAVE 3/32 DIG MUSE WINEBROWN WHEELS LEAVE THE BOTTOM OF LAST I/IA BALSA SHEET FLUSH WITH OUTER EDGE WING SPAN WING AREA ELECTRIC MOTOR BATTERY PACK PROP SPECIFICATIONS I/N I6 BALSA STRINGER TYPICAL DIHEDRAL LOWER WINGI_ EACH TIP Il/B PLY 0 HEORAL BRACE 3/16 50 BALSA tB 3/16 50 BALSA 3/16 BALSA SHEET STAB 3/IA S/B BALSA 3/IA 1/3 BALSA 3/16 SQ BALSA HINGE TO SUIT C ELEV I/B PLYWOOD 3/32 DIG LANDING GEARMUSIC WINE SEE CONSTRUCTION DETAIL FRONT REAR I/A DIA MUSIC WIRE NOTCH TO GIVE CABANEEPOXY GRIP hPATTERN 0I23456 MODEL AVIATION KRUMPLER DESIGNED BY MARTIN IRVINE 39-I/U 500 55 IN SAC 075 SANYO 7 CELLTRACING BY 30E DEMARCO TAIPAN 5 4 RIGHTS RESERVED 0 0 I0 0 CD 0 CD 2 0 CD -I -L Co 0 0 U World Engines$25-$35 72 MHz NB receivers offered RCD types $6995 Other 27 50 53 72 75 MHz com plete RC service Speed controls chargers repaired P & H $5-$lO Tim Abrens/Aero Electronics 127 Route 6 Box 54J Austin TX 78737 72 MHz transmitters serviced Ace RC Futaba FM sticker$10 AM conversion $15 Alignment plus crystals$40-$5O Other 27 50 75 MHz bands ser viced Custom applications Ni-Cd peak detector chargers P & H $6-$9 Authorized RC Service 128 327 South Stage Coach Lane Fallbrook CA 92028 tel 1-601/728-0440 Open Wed nesday Thursday Friday Saturday 10 am-230 pm 72 MHz transmitters serviced Ace Air tronics Cannon Cox Futaba Hobby Shack Kraft Pro-Line others 72 MHz receivers offered RCD $6995 plus crystal$695 Ace$75$115 P & H $5-$8 Bill Slayton 129 1005 Phillips Drive Dumas TX 79029 E L Lltchfield 130 4707 Woodside Manor Tampa Fl 33624 tel 1-813/8785382 Peter Calvagna 131 1092 Becker School Rd Freeport IL 61032 Thomas Albrlght 132 7303 Stony Hill Rd Wake Forest NC 27587 Krumpler/Irvine Continued page 50 Krumpler threatening end up nose heavy put motor battery aft end hatch Two Y6-sq strips glued bottom hatch spac ing equal width power pack pack rested between Next wire yoke glued rear hatch angled dowel added forward end battery placed between wood strips held place #64 rubberband stretched between yoke dowel first time have used technique works well shall use again makes battery access easy hatch itself held #32 rubberband looped over hatch forward wing dowels Its crude effec tive going use MCR 4A re ceiver add cooling scoops sides nose top hatch will help keep receivers MOSFETs metal oxide-semiconductor field-effect transis torsEd cool efficient kept way Servos mounted far back possi ble put cross sheet /16 below bat tery pack placed receiver initially midsized FMlO7N its battery pack 5R300 mAh between lower wing speed controller Sommerauer Mk 3 25-amp 6- 14-cell unit under motor current-limiting de sign installed fuse under cowling anyway first saw particular arrangement issue newsletter Electric Model Flyers Southern Ontario EMF SO Two Sermos connector housings glued together piece /16 ply tween two small pieces /32 ply AEROMODEL GIANT SHARK ARC PRE-BUILT 0 SHARK $21495 SEE YOUR HOBBY DEALER EIRST SEND STAMPED #10 ENVELOPE POR INFO KINGS WAY RIG HOBBY SUPPLY 5559 RICHMOND HOUSTON TX 77056 DEALERS ONLY 1-800-621-7783 December 1990 155 Sound Supression Oesign High Thrust Efficiency Long Fiber Advanced Composite Material Proven Performance US Masters US Nation als Canadian Nationals World Champion ships Spoits Sizes 57x3 7x3 7x4 7x5 7x6 7x7 7x8 7x9 7x10$159EACH 8x4 8x5 BxB 8x7 8x8 SxS BxlO $179 EACH 9x4 9x5 9x6 9x7 9x8 9x9 9x10 $199 EACH 95x45 10x6 lOx 7 10x8 10x9 lOx 10 $229 EACH 11 xB 11 x7 11 xB 11 x9 12x6 12x7 12x8 ..$289EACH Competition 11 xlO 11 xli 11 x12 11 xl2W 11 x13 11 x14 12x9 12x9W12x10 l2xlOW 12x11 l2xllN 12x 12 12x12N 12x 13 12x13N 12x14 $795 EACH 135 x 125 135 x 14 14 x8 14x 10 14x 12 14x 14 144 x 105 144 x 12 $1295 EACH Contact local hobby dealer Manufactured Landing Products Knights Landing California glued inside housings order put contact under pressure assembly glued A2-in mounting plate turn mounted aircraft nice part about have fused system safety can use arming switch removing replacing fuse Off might want attach fuse airframe short length cord dont lose have used system number models though speed controller limits amperage fully stalled motor fuse doesnt blow al though certainly will control ler Later changed radio Futaba Electric radio MCR 4A receiver dropped weight about four oun ces sneezed Graupner 8 x 4 prop seven 900SCR Ni-Cd cells motor Goldfire now draws over 30 amps according DSC ammeter original current-limiting STW control ler wouldnt pass 26 amps amounts input over 200 wattsor about 100 watts per pound model weight Rocket-propelled biplanes cup tea substituted six-cell l200SC pack dropped peak current freshly charged pack 27 amps 162 watts still potent combination has poop original setup Interestingly requires side thrust before may due fact removal two-ounce speed controller nose aircraft moved CG aft bit made controls little sensitive added air scoops made plastic spoons nose increase airflow over MCR 4As MOSFETs con troller isnt supposed handle current magnitude However have run set seven 900SCRs down just cool ing see photos using Graupner 8 x 4 prop 30-plus amps ini tially shut down after 105 sec let cool got just 15 sec Therefore would guess would have worked air adding scoops much better MOSFETs As now land can feel MOS FETs cool touch remove battery pack have heard people having difficulty radios such shutting down motor too soon being able handle 15 amps Another local flier has similar results both MCR 4A units think troubles other people have must defec tive units some other installation problem complaint radio 50-Hz controller isnt very good fer rite motors time magnets will lose power sounds slightly rough lower throttle settings right applica tion think great little rig Certainly have respect now know what can Its keeper MtCfled Performance system TOP PERFORMANCE K&B ENGINES AirplaneMarine K&B FUELS K&B GLOW PLUGS 9 Blends4 Chsices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B Micro-Bailsons FILLtR K&B SUPER FOXY RESIN K&B THINNER K&B SUPER POXY PRIMER K&P IIPPR pesy PaINT note wiring connectors may order Use good stuff Cheap power systems need best expensive sys tems deserve have standardized con nectors sold Sermos same Anderson Power Poles available Hobby Horn Sermos Jomar SR number other Electric suppliers best avallable Similarly use specialty wire same suppliers youre sure something phone will help out right over phone object using wire minimize losses electrical system Theres no point wasting power dont need cost best especially compared cost airplane very small Covering Any iron-on film market will work well aircraft because strength wing thanks hard wood spars covered entire airframe lightest Coverite Micafilm V ozIyd us ing Balsarite adhesive find clear easier put colored gives airplane clear-doped tissue look also shows off construction rather well provides incentive good work careful adhere covering rib spar extra strength imparts can trim film wish over 156 Model Aviation 555 APCJ APC PROPELLERS CULPEPPEE C MODELS INC 2526 Washington DubuqueIA 52W1 31915334839 Micaflim Assembly Glue wing hold-down dow els rubberband bottom wing position Next slide formed center sec tion struts place Lift out Ae-dia holes fuselage until top wing sits indicated angle inci dence Robart incidence meter works well Remove make sure free surface oil grease notched provide good grip glue Smear slow-setting epoxy drip some holes reassemble Again check angle incidence checking upper lower wing tips same distance apart satisfied let set overnight Now top cross pieces bent bound center section struts soldered Ply wood strips used provide bearing sur faces positive location keying wing glued top wing cut ting away some film ensure ade quate adhesion used quite crude locat ing system because tight schedule building model plan shows abet ter can add some balsa strips simulate scalelike struts make sure wont foul battery hatch wing attachment finished care fully glue stab fin place making sure straight used Sig CA hinges original Williams Bros 2-in wheels used undercarriage About time tail skid can added nonfunctional interplane struts made slightly rounded /t6 balsa inside large plastic drinking straws de signed held place wing ten sion meant come out break before wing damaged case hard landing hitting something Now can balance airplane best procedure try move things around inside necessary achieve cor rect balance rather adding balance weights following summary originals weights 1 oz grams Top wing complete uncovered46 gm Balsarite adhesive3 gm Covered54 gm Covered lettered59 gm Bottom wing 3 grams less Fuselage complete dowels cabane wires landing gear no pushrods wheels cabane cross wiresun covered78 gm Balsarite adhesive2 gm Covered83 gm Stabilizer elevator uncovered 8 gm Coveredil gm Fin rudder uncovered4 gm CoveredS gm Total airframe12 oz Radio weight75 oz later MCR 4A RX35 oz SEE YOUR DEALER OR ORIER DIRECT PLEASE ENTER MY ORDER FORFUEL WJZZARDS AT $ 750 EACh POSTAGE PAID NAMESTREET_______________________ CITYSTATE_______________ ZIP_________ Motor weight connectors prop adapter9 oz Battery weight connectors 7 x 900SCRlO5 oz 6 x 12005CRuS oz Total flying weight STW reg ular radio 7 x 900s39 oz Total flying weight MCR 4A ra dio 6 x 1200s36 oz Flying As stated introduction original Krumpler required Right little Up trim Level flight maintained throttle quick takeoffs aer obatics require full nearly full throttle landing gear fairly far forward have ready correct swing takeoff isnt hard So far have ground looped Krumpler once its test flight before knew much right trim would neces sary takes off less 50 ft no wind less breeze keep flat after breaks ground gain little speed before start pulling much elevator Keep first flight two gentle until have feel airplane Later can throw around rudder throw quite sufficient elevator figure eights very small area Loops fairly straightforward require either nearly-full power lit tle dive first better wind Continued page 162 NOWATWO TAPE SET tape youve waiting finally herell youre new bobby just want learn secret wood plane construction YOU PLANE VIDEO Presents BUILDING IT RIGHT THE FIRST TIME FIRST NO-NONSENSE VIDEO OF WOOD AIRCRAFT CONSTRUCTION APPROX 4 HOURS ON eFuel tank installation eNew engine setup 0 Fuselage construction OBUILDING STRAIGHT C Installing pushrods C Covering film C Eliminating warps e Aligning Salancing C Final checkout ePLUS MUCH MORE! Radio installation Straight wing building Installing hinges C Shear webbing Applying PG cloth S Servo installation Setting up new radio Dozens building tips Slab tall surfaces Aileron installation CREDIT CARD CUSTOMERS Use toll free number place order Have VIS4 MasterCard VISA ready calI.24HR5 DAY OR mail $3495 S & H Iforelge orders add $800 5/H PLANE VIDEO terCaPO Box 23128 Cliv Iowa 50325 Iowa residents add 4%sales tax PLAN vicevanG1Ou1LO 7 fliuvYti FREEI800I 38382 5VTOLL FREE 24HR24HR OR 5151223-0897 December 1990 157 FUEL WIZZARD THE WORLDS FASTEST AND MOST CONVENIENT FUEL PUMP EVER * FITS ALL GALLON FUEL BOTTLES * FAST ONE STROKE LL OUNCE OF FUEL * ALL FUEL SAFE GLO FUEL & GASOLINE SUGGESTED RETAIL $995 NOW JUST $750 ORDER FROM ACME PLASTIC PUMP CO P 0 BOX 24551 MINNEAPOLIS MN 55424 DEALER INQUIRIES INVITE) FILLS THE LARGEST MODEL FUEL TANKS IN SECONDS Krumpler/Irvine Continued page 157 loops deteriorating plane falling off top battery running down its time pian landing Spins require CG further back whit used initially removal two-ounce speed controller nose can get spin little power just top stall needs blast air across tail get going Stall turns easy Just go power push stick over Snap rolls level flight just easy Feed little Up elevator just see nose start rise pull stick right over full back zips right around actually pauses level flight before going spiral dive pause cue let go stick can make way down length field snapping 10 20 yards stall turn other end repeat comine other way glide moderate remember bi planes draggy better struts Nevertheless find biplane struts mildly offensive usually have Make first few approaches bat tery power left have option going around rumbling generally fly until detect slight drop power cut throttle come just last little bit reserve SCR cells have sharp discharge knee almost like running out fuel whereas SCs give about 30second warning airplane best calm weather steady breeze 1989 KRC Fun Fly quite windy varied constant fine Krumpler gusty flyable much fun best time have far has evening flying wind has dropped THE WIREMASTER TM bessderutcolter extra large handle bends 1/8-1/4 coils S/ 32-3116 music wire Wlre peep eliminated ANTI-KREEP WIRE LOCKTh free catalog also has hardware accessories JOM COMPANY 114 Washfrlgton T Dept Waukegan IL 60095 can shoot touch-and-go after another admiring set ting sun shines through covering put skis winter flying put Goldfire Flying qualities deterior ated slightly because extra drag weight skis nothing major Conclusion What might change sec ond Krumpler might shorten nose bit build straight wings ease ten dency towards nose-heaviness might turn something else air Krumpler has bit Tiger Moth itand little Bucker Jungmann well creative modeler might take few minor changes create nice small Scale Electric last point build Krum pler please send comments photo Martin Irvine 34 Beaver Crescent Kingston Ontario Canada K7M 7C 1 will answer correspondence would appreciate sending stamp RC Helicopters/Jolly Continued page 52 Concept 30 SX complete highperformance package expert fliers Kit Concept 30 SX arrived nicely packaged gold box vividly displaying SXs sleek lines lid slid off parts exposed evident Concept 30 SX pure Kyosho kit features excellent quality obvious thought put part SX shipped standard Concept struction manual two separate addendum sheets pertain specifically SX Kyosho understands multinational necessity clear pictures result manuals feature ex cellent illustrations just enough text take over rough spots standard Concept manual over 30 pages super piece work Anyone can build Concept merely looking pictures matching parts fas teners Concept 30 SX difficult assemble Following instructions letter took under seven hours start finish Youll have no problems Ill expand just briefly few steps feel may lacking text Step 11 Set clutch lining place glue thin CyA add glue first youll tiAWIUKUUKKILANE RAF WAS GLAD TO H4 YE t SPITFIRE RIJTITIA4D TO HAVE T pSIS 00 01501 Add Si 500 hEFIa Usa VISAs MC 015151050 015 COO Polyester HaM Laid Fibealaaa1/aS Soale Fuselage ngspan.50 noVas lete eels aod llardwaeFuse LengTh. 0353 lncttea Paclsages IndudadWeight.12 Lbs Meotrina Cut Foam Adog Cares Fonssr.2oy5OTs 108 Any 125 / Heavy Duty Styiene Clam Canopy1mm Legal / Flbertleas Cowl Fuse H Molded Stringers Easy RuildEsay Fly Esoellent Beginnem Waibjid SoossassIss AesHaWe 55550 reps s sed Fplns trawsa SeataTkea8t5jbs55alieht0tats IR5m5 5 LRta 054 Las 0th /S KIt AeettRhe Wue isa. a WutS leSs 750*5 Pes.ZeyW Ta toe Aan tss Jte Pun 551 a. P5351 P P-a ME-flOsS Nasmyx 1LU3Mesa Ms5oTan8 ml P5133 035331 l-amoaavImn never get lining belongs before sticks itself tableyou get pic ture step 13 main frame assembly call out 2 x 3 x 10mm-long self-tapping screws illustration shows could shorter hold cooling shroud place fact screws too long will bind up clutch bell step 19 tail rotor assembly make sure use plastic-compatible screw cement supplied kit good job tightening pitch ring nut slide bushing assembly could better designed allow positive grip during assembly would help ensure nut will separate bushing dur ing use step 21 dont glue new control rod sup ports place Instead decide go apply -in strip vinyl electrical trim tape boom Rub edges tape down well slide supports position twisting motion Youll find fit snugly removable can also put some tape boom under horizontal stabilizer help snug up step 31 installation canopy should use additional two screws front lower sides canopy keep decals lifting canopy front edge Id like add suggestions just no way intended detract Concept manual excellent build ing aid kit complete Concept yos would literally have try fail keep achieving success What radio Concept SX used Air tronics Vanguard six-channel FM system SGX gyro transmitter features dual rates elevator aileron has idle up setting pitch trim revolution mix throttle hold servo reversing switches todays standards Vanguard rates very basic heli system Unlike PCM 10 1024 hell pilots will able use everything Vanguard-type sys tem Its perfect beginner will per form contest system Novice Scale maybe far Intermediate since can per form upright maneuvers SGX system comes gyro mixer dedicated tail rotor servo features single adjustable gain reversing switch FAt caliber its perfect novice will want set gain up high authority adjust gyro suit taste pro gresses SGX will also find favor fixedwing tail-dragger pilots think its just ticket short-coupled Scale ship gets fe isty takeoff Check out couldnt easier install Vanguard performed admirably glitch think however suitable training SX will capable everything expert will want SX mind switched over Air tronics Spectra 7 PCM radio still pre microprocessor has enough bells whis tles allow competent pilot explore SXs inverted capabilities motivator power used standard 05 32 FSR H coupled Vortexs Eikohgiken C 30 muffler What can say about start idle produce lot powerall good things want heli motor C 30 seems help out power department has added advantage allowing adjust low idle mixture motor once course 162 Model Aviation Rubber ft Ongine Power Free Flight Display Control Line Eleotric Power RIC Airplenee new liluetrated 32 page tabloId size catalog US ft Canade $100 Foreigh $300 Penn Valley Hobby Center 837-A W Main St Lanadale PA 18446 215 368-0770 ZENOAH SACHS-DOLMAR & QUADRA ENGINES ERCOUPE TOMAHAWK & J-3 KITIEN KITS ZINGER & DYNATHRUST PROPS FUEL TANKS Carbon-Fiber Arrowahafte Ceconite & Glue DGA & MGA PILOTS Send $100 catalog JIM MESSERS QUALITY MODEL PRODUCTS Valley View Dr Box 43 Allegany NY 14706
Edition: Model Aviation - 1990/12
Page Numbers: 46, 47, 48, 49, 50, 51, 155, 156, 157, 162
NO OCR TEXT 1_ _ - iI-4La{ ______ tric-powered biplane looks like might actually have post-WW full-scale plane early homebuiltbut its Its entirely original design Build lot easy sport flying EMartin Irvine TWO WEEKS before 10th Annual KRC Electric Fun Fly found myself needing new airplane love NW biplanes course everyone knows Electric bipes require too much power overcome drag truly practical obvi ously have never seen Keith Shaws 60-size Stearman decided kept fuse lage fairly small number struts minimum should OKa nice slow flier What banged together two weeks what see test flew sun going down Friday September 15 11 hours before leave KRC meet Id like say flew right off board design ers have admit required three-fourths Right rudder two clicks Up elevator trim before flew straight Big deal thought amount rudder re quired because lack right thrust motor Small bipes often require sideand down-thrust haste forgot side-thrust tried model still required some right trim cant see warps anyway dont mind small amount trim down-thrust built way wing incidence 20 30 top bottom wings respectively sta bilizer incidence 2 O causes air plane fly slight downward angle ef fectively giving down-thrust flew number flights KRC meet terrific weekend anyone inter ested Electrics should attend least once got requests plans five people made think might have wider appeal article re sult specification table will tell what might want know about Krumpler just couple ad ditional notes needed first used DSC 075 motor sim ilar 075/550-size motors current generation complete kit Electric trainers sport planes bat tery pack Sanyo seven-cell 9005CR pack prop used Taipan 8 x 4 combination motor draws 19 amps calculates total power put 130 watts think airplane needs seven-cell pack use 550-type motor want reliable takeoffs grass Although can done six cells marginal much fun remotored Great Planes Goldfire motor has much poop usual 550 course ex pense much higher current over 30 amps current-limiting STW speed con troller wouldnt let 26 amps get through flight times short absurd tried Futaba MCR 4A re ceiver great success able use six-cell packs am getting ahead myself Lets build first Construction Wings make plywood master rib cut ribs sharp No11 blade center section ribs just trim A6 off top bottom surfaces Decide what size spars want make spar cut outs suit used /8 x /16 basswood spars rather uncommon sizeso might use /8 x bass spruce Don t use balsa spars wont strong weight saving would negligible Use medium weight straight-grained balsa rest wing dihedral brace ply goes between spars does shear webbing Dont leave webbing out weighs little adds lot stren2th can build either top lower wing first will constructed panel time Start laying down lower spar trailing edge Place ribs position angling root rib bit dihe dral add top spar dry ie no glue Eyeball everything assure straight use thin CyA glue things solid Add leading edge being careful shim up lined up top bottom ribs Glue wing tip pieces add vertically grained shear webbing between spars braced trailing edge gussets Now build other wing panel youre finished cut slot root ribs dihedral brace December 1990 47 No havent just landed underside view shows slight wing sweep generous tail mo ment translucent covering Barely visible fuse mount ahead lower wing cen ter section Bottom hatch Balsa rails keep motor pack seven 900SCRs centered Note wire yoke rear No 64 elastic 3A-ln dowel acts forward battery hold-down point Everythings mounted hatch base Yoke held CyA has stood some unexpected arrivals four notches sides clear cabane struts Join two halves epoxy have time make adjustments suring have correct dihedral inch side top wing 1 /2 side bottom wing Next A-in center section trailing edge piece can shaped added can leading edge A-in piece Glue center section sheet Keep mind spars flush covering dont sheet over strut fittings made A-in sheet notched interplane struts backed / ply just buttglued side ribs strong enough struts weaker wing structure will knock out break before damaging wing experience speaks Brace rear fitting %-in sq flush covering surface other wing built exactly same way Tail The stabilizer needs no explanation fin rudder built using old Free Flight technique called laminating Its easy strong looks great First cut A-in balsa blank form inside line fin rudder Dont bother wax anything Next cut seven strips soft A2 x x 24in balsa additional strip little wider Pin form down surface covered waxed paper Stack strips together using pins hold things place wrap around form slightly wider strip should inside next form use little tension pull ing strips around will find dry wood bends quite easily Once strips pinned place push laminations down flush build ing surface Now use thin CyA glue everything solid being careful get glue form slightly wider piece placed against form acts dam stop CyA sticking lam inations form Once glue has set unpin outline tum over CyA other side stack has set gently spring outline open will quickly see lam inations need glue Now thumbtack sheet fine sandpaper 48 Model Aviation Lower wing cutout radio bay has enough room lot Two 51338 right receiver battery pack sit middle Note mounted balsa floor grain across fuselage Minimal foam needed because lack vibra tion some should used protection rough landings fuselage holder on/off switch ahead wIng Construction wing outlined article Top view nose sans hatch Note side thrust DSC 075 motor Looks snug everything fits fairly easily bottom STW Sommeraur MK3 speed controller motor/controller connectors top Loose set connectors battery pack tached underside hatch XLR *8RL w/PLS I9ARTJNIRVINE 4 BRLRRj8& g Q8EL&R 6LFU- x -4 tic WfRE 4 8nL~ \\ Q N Cl 16 o5Q B l-OMERcN8 075 M0rc N 11~~~ 0 0fif i 0ji~MRIRVJNE 0 fl-VINe 51YI 0 TW PLANL OL BUDDr5HEFT IA UC NOj- VNCflcJLRUT INSIDE NDRINJNG S7Rflh ToPUJ1Io~JTH WIN& N 4BAL8R&HErT Q Q TE flat surface carefully sand out line smooth find works best hold under extended fingers sand cir cular motion Once reasonably smooth pin plan add other pieces trimming outline leave leading edge little long can act key rear fuselage upper surface Now can cut rudder free think will pleasantly surprised strong structure Fuselage Construct both basic sides 3/ square sheet best second side constructed over first small pieces wax paper glue joints pre vent two sides sticking together Note right side shorter left give built-in side thrust cabane struts will glued slotted balsa pieces fuselage Dry fit pieces groove accept 1/16 spring steel cabane wires before glu ing place Make sure slots inside surface fuselage Groove upper longerons accept cabanes add A6 sheet doubler inside both sides Note does run full length nose stops short motor bulkhead provide slot its insertion later Fill ward two bays /16 sheet Now add / x 3A6-in strips tail end let A6 sheet outside edge course time being care ful build right left sidearent assemble basic fuselage put gether upside down forward upper longerons flat against building board temporary Y6-in -sq crosspiece forward cabane mount permanent ones rear battery hatch leading trailing edges wing Now have basic box should square angles Check redo necessary cant expect plane fly straight looks like should have Chi quita painted side Once straight pull forward fuse lage together install motor bulk head Next draw rear fuselage together tail join checking straight ness Add remaining /l6 cross pieces Next bend landing gear sew landing gear bulkhead wire Spread epoxy glue over sewn joint glue assembly position fuselage doing might want temporarily attach lower wing check level rear fuselage has piece A-in sheet set between upper rear longe rons act base fin left leading edge fin little long can cut slot forward edge piece accept Dont add tail skid yet easier after have cov ered fuselage Now can add rear turtledeck form ers Cut slot center A6 x A-in stringer top center former Ad just things until stringer straight level glue place Next using straightedge very sharp blade cut slots other two stringers side equidistant center stringer upper longeron three stringers end up being flush last crosspiece just ahead fin Add diagonal bracing top bottom first add side bracing lower cowl sheeting should added yet Now get hatch Hold piece A-in sheet top trace along inside upper longerons Cut A-in sheet out leaving line Next carefully break out temporary crosspiece glued across forward center section struts landing gear bulkhead helps hold sides apart now Carefully sand hatch base until snug tight fit Glue formers place add sheeting two halves front back Now add side pieces easier add after adding sheeting before Trim cockpit outline notch sides cabane struts Add lower cowling A6 sheet wing dowels bits pieces nose Round off make nose look little like radiator Now its done Radio power installation found Continued page 155 Lower end interpiane struts Diagonal bracing apar rib iooka fiimsy Strut piastic straw roughiy-shapod balsa strip inside Wing hoids place appearance oniy Laminated outline technique fin rudder illustrated right Straight pieces brace outline against warping Rudder pushrod longer ideal because tight rear fuselage Note links use tubing keeper 50 Model Aviation Lower rear fuselage Simple tall skid dowel quite strong Note small brass locknut backing Quick Link Its railroad supplier Looks neat Dont overtighten youll weaken brass coupler fly off pavement consider using wire tall skid run antenna fin top 1116 PLYWOOD TOP WING 1/16 PLYWOOD ING DIHEDRAL BRACES DIHEDRAL- UPPER WING HERE AT EACH TIP BALSATWO STRIPS OF lAB I/B__________________ I/B3/16BASSWOOD3/161/4BALSAFILLPLY UNDERSIDE OF UPPER SPARS TOP 6 BOTTOMLEADING EDGE___________________ 1/16 BALSA SHEET 1/16 BALSA WEBTOPS BOTTOM BOTH 3/4 3/16 BALSA GRAINWINGS TRAILING EDGE R-3 BALSA FILL3/IA 1/4 BALSA LEADING EDGE 1/4 BALSA WITH _____1/64 PLY BACKING N-I N-I\WING STRUT N-S ____ N-Gil1SLOT 3/6 BALSA BALSA F-I R-26-3TRAILING EDGE F-2 B F-3HATCH EDGE I/B A SHEET~i3/43/IRTE -HATCH BASE6-I DIG MWCOT /16 WIDE SLOT WING DETAIL F-43/lA BALSA1/16IN RI AETER ASSEMA SHEETWING NAILS F51A6BALSA I/IA DIG MUSIC I: SHEETWINE CABANE F-6G-V4 3/IA SONOTE U I/IA BALSA SHEET DGUBLFR WITH LIGHTBHG HOLES 3/16 1/2 BALSA I/A 5/16 BALSA GROOVED FOR HATCH EDGE- SEECABANE3/16 50 AA5A F- CROSS SECT I/IA I/B PLY GI/4LONGTO F-4SA7 -- - --- 2 INCIDESCE I/B PLYWOOD OPTIONAL-MOTOR 3/IA SO BALSA UPRIGHT B CROSS PIECES MOTOR MOUNTSHEET ELS-WILLIAMS ELAGE SIDE VIEW /BROS ON DAVE 3/32 DIG MUSE WINEBROWN WHEELS LEAVE THE BOTTOM OF LAST I/IA BALSA SHEET FLUSH WITH OUTER EDGE WING SPAN WING AREA ELECTRIC MOTOR BATTERY PACK PROP SPECIFICATIONS I/N I6 BALSA STRINGER TYPICAL DIHEDRAL LOWER WINGI_ EACH TIP Il/B PLY 0 HEORAL BRACE 3/16 50 BALSA tB 3/16 50 BALSA 3/16 BALSA SHEET STAB 3/IA S/B BALSA 3/IA 1/3 BALSA 3/16 SQ BALSA HINGE TO SUIT C ELEV I/B PLYWOOD 3/32 DIG LANDING GEARMUSIC WINE SEE CONSTRUCTION DETAIL FRONT REAR I/A DIA MUSIC WIRE NOTCH TO GIVE CABANEEPOXY GRIP hPATTERN 0I23456 MODEL AVIATION KRUMPLER DESIGNED BY MARTIN IRVINE 39-I/U 500 55 IN SAC 075 SANYO 7 CELLTRACING BY 30E DEMARCO TAIPAN 5 4 RIGHTS RESERVED 0 0 I0 0 CD 0 CD 2 0 CD -I -L Co 0 0 U World Engines$25-$35 72 MHz NB receivers offered RCD types $6995 Other 27 50 53 72 75 MHz com plete RC service Speed controls chargers repaired P & H $5-$lO Tim Abrens/Aero Electronics 127 Route 6 Box 54J Austin TX 78737 72 MHz transmitters serviced Ace RC Futaba FM sticker$10 AM conversion $15 Alignment plus crystals$40-$5O Other 27 50 75 MHz bands ser viced Custom applications Ni-Cd peak detector chargers P & H $6-$9 Authorized RC Service 128 327 South Stage Coach Lane Fallbrook CA 92028 tel 1-601/728-0440 Open Wed nesday Thursday Friday Saturday 10 am-230 pm 72 MHz transmitters serviced Ace Air tronics Cannon Cox Futaba Hobby Shack Kraft Pro-Line others 72 MHz receivers offered RCD $6995 plus crystal$695 Ace$75$115 P & H $5-$8 Bill Slayton 129 1005 Phillips Drive Dumas TX 79029 E L Lltchfield 130 4707 Woodside Manor Tampa Fl 33624 tel 1-813/8785382 Peter Calvagna 131 1092 Becker School Rd Freeport IL 61032 Thomas Albrlght 132 7303 Stony Hill Rd Wake Forest NC 27587 Krumpler/Irvine Continued page 50 Krumpler threatening end up nose heavy put motor battery aft end hatch Two Y6-sq strips glued bottom hatch spac ing equal width power pack pack rested between Next wire yoke glued rear hatch angled dowel added forward end battery placed between wood strips held place #64 rubberband stretched between yoke dowel first time have used technique works well shall use again makes battery access easy hatch itself held #32 rubberband looped over hatch forward wing dowels Its crude effec tive going use MCR 4A re ceiver add cooling scoops sides nose top hatch will help keep receivers MOSFETs metal oxide-semiconductor field-effect transis torsEd cool efficient kept way Servos mounted far back possi ble put cross sheet /16 below bat tery pack placed receiver initially midsized FMlO7N its battery pack 5R300 mAh between lower wing speed controller Sommerauer Mk 3 25-amp 6- 14-cell unit under motor current-limiting de sign installed fuse under cowling anyway first saw particular arrangement issue newsletter Electric Model Flyers Southern Ontario EMF SO Two Sermos connector housings glued together piece /16 ply tween two small pieces /32 ply AEROMODEL GIANT SHARK ARC PRE-BUILT 0 SHARK $21495 SEE YOUR HOBBY DEALER EIRST SEND STAMPED #10 ENVELOPE POR INFO KINGS WAY RIG HOBBY SUPPLY 5559 RICHMOND HOUSTON TX 77056 DEALERS ONLY 1-800-621-7783 December 1990 155 Sound Supression Oesign High Thrust Efficiency Long Fiber Advanced Composite Material Proven Performance US Masters US Nation als Canadian Nationals World Champion ships Spoits Sizes 57x3 7x3 7x4 7x5 7x6 7x7 7x8 7x9 7x10$159EACH 8x4 8x5 BxB 8x7 8x8 SxS BxlO $179 EACH 9x4 9x5 9x6 9x7 9x8 9x9 9x10 $199 EACH 95x45 10x6 lOx 7 10x8 10x9 lOx 10 $229 EACH 11 xB 11 x7 11 xB 11 x9 12x6 12x7 12x8 ..$289EACH Competition 11 xlO 11 xli 11 x12 11 xl2W 11 x13 11 x14 12x9 12x9W12x10 l2xlOW 12x11 l2xllN 12x 12 12x12N 12x 13 12x13N 12x14 $795 EACH 135 x 125 135 x 14 14 x8 14x 10 14x 12 14x 14 144 x 105 144 x 12 $1295 EACH Contact local hobby dealer Manufactured Landing Products Knights Landing California glued inside housings order put contact under pressure assembly glued A2-in mounting plate turn mounted aircraft nice part about have fused system safety can use arming switch removing replacing fuse Off might want attach fuse airframe short length cord dont lose have used system number models though speed controller limits amperage fully stalled motor fuse doesnt blow al though certainly will control ler Later changed radio Futaba Electric radio MCR 4A receiver dropped weight about four oun ces sneezed Graupner 8 x 4 prop seven 900SCR Ni-Cd cells motor Goldfire now draws over 30 amps according DSC ammeter original current-limiting STW control ler wouldnt pass 26 amps amounts input over 200 wattsor about 100 watts per pound model weight Rocket-propelled biplanes cup tea substituted six-cell l200SC pack dropped peak current freshly charged pack 27 amps 162 watts still potent combination has poop original setup Interestingly requires side thrust before may due fact removal two-ounce speed controller nose aircraft moved CG aft bit made controls little sensitive added air scoops made plastic spoons nose increase airflow over MCR 4As MOSFETs con troller isnt supposed handle current magnitude However have run set seven 900SCRs down just cool ing see photos using Graupner 8 x 4 prop 30-plus amps ini tially shut down after 105 sec let cool got just 15 sec Therefore would guess would have worked air adding scoops much better MOSFETs As now land can feel MOS FETs cool touch remove battery pack have heard people having difficulty radios such shutting down motor too soon being able handle 15 amps Another local flier has similar results both MCR 4A units think troubles other people have must defec tive units some other installation problem complaint radio 50-Hz controller isnt very good fer rite motors time magnets will lose power sounds slightly rough lower throttle settings right applica tion think great little rig Certainly have respect now know what can Its keeper MtCfled Performance system TOP PERFORMANCE K&B ENGINES AirplaneMarine K&B FUELS K&B GLOW PLUGS 9 Blends4 Chsices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B Micro-Bailsons FILLtR K&B SUPER FOXY RESIN K&B THINNER K&B SUPER POXY PRIMER K&P IIPPR pesy PaINT note wiring connectors may order Use good stuff Cheap power systems need best expensive sys tems deserve have standardized con nectors sold Sermos same Anderson Power Poles available Hobby Horn Sermos Jomar SR number other Electric suppliers best avallable Similarly use specialty wire same suppliers youre sure something phone will help out right over phone object using wire minimize losses electrical system Theres no point wasting power dont need cost best especially compared cost airplane very small Covering Any iron-on film market will work well aircraft because strength wing thanks hard wood spars covered entire airframe lightest Coverite Micafilm V ozIyd us ing Balsarite adhesive find clear easier put colored gives airplane clear-doped tissue look also shows off construction rather well provides incentive good work careful adhere covering rib spar extra strength imparts can trim film wish over 156 Model Aviation 555 APCJ APC PROPELLERS CULPEPPEE C MODELS INC 2526 Washington DubuqueIA 52W1 31915334839 Micaflim Assembly Glue wing hold-down dow els rubberband bottom wing position Next slide formed center sec tion struts place Lift out Ae-dia holes fuselage until top wing sits indicated angle inci dence Robart incidence meter works well Remove make sure free surface oil grease notched provide good grip glue Smear slow-setting epoxy drip some holes reassemble Again check angle incidence checking upper lower wing tips same distance apart satisfied let set overnight Now top cross pieces bent bound center section struts soldered Ply wood strips used provide bearing sur faces positive location keying wing glued top wing cut ting away some film ensure ade quate adhesion used quite crude locat ing system because tight schedule building model plan shows abet ter can add some balsa strips simulate scalelike struts make sure wont foul battery hatch wing attachment finished care fully glue stab fin place making sure straight used Sig CA hinges original Williams Bros 2-in wheels used undercarriage About time tail skid can added nonfunctional interplane struts made slightly rounded /t6 balsa inside large plastic drinking straws de signed held place wing ten sion meant come out break before wing damaged case hard landing hitting something Now can balance airplane best procedure try move things around inside necessary achieve cor rect balance rather adding balance weights following summary originals weights 1 oz grams Top wing complete uncovered46 gm Balsarite adhesive3 gm Covered54 gm Covered lettered59 gm Bottom wing 3 grams less Fuselage complete dowels cabane wires landing gear no pushrods wheels cabane cross wiresun covered78 gm Balsarite adhesive2 gm Covered83 gm Stabilizer elevator uncovered 8 gm Coveredil gm Fin rudder uncovered4 gm CoveredS gm Total airframe12 oz Radio weight75 oz later MCR 4A RX35 oz SEE YOUR DEALER OR ORIER DIRECT PLEASE ENTER MY ORDER FORFUEL WJZZARDS AT $ 750 EACh POSTAGE PAID NAMESTREET_______________________ CITYSTATE_______________ ZIP_________ Motor weight connectors prop adapter9 oz Battery weight connectors 7 x 900SCRlO5 oz 6 x 12005CRuS oz Total flying weight STW reg ular radio 7 x 900s39 oz Total flying weight MCR 4A ra dio 6 x 1200s36 oz Flying As stated introduction original Krumpler required Right little Up trim Level flight maintained throttle quick takeoffs aer obatics require full nearly full throttle landing gear fairly far forward have ready correct swing takeoff isnt hard So far have ground looped Krumpler once its test flight before knew much right trim would neces sary takes off less 50 ft no wind less breeze keep flat after breaks ground gain little speed before start pulling much elevator Keep first flight two gentle until have feel airplane Later can throw around rudder throw quite sufficient elevator figure eights very small area Loops fairly straightforward require either nearly-full power lit tle dive first better wind Continued page 162 NOWATWO TAPE SET tape youve waiting finally herell youre new bobby just want learn secret wood plane construction YOU PLANE VIDEO Presents BUILDING IT RIGHT THE FIRST TIME FIRST NO-NONSENSE VIDEO OF WOOD AIRCRAFT CONSTRUCTION APPROX 4 HOURS ON eFuel tank installation eNew engine setup 0 Fuselage construction OBUILDING STRAIGHT C Installing pushrods C Covering film C Eliminating warps e Aligning Salancing C Final checkout ePLUS MUCH MORE! Radio installation Straight wing building Installing hinges C Shear webbing Applying PG cloth S Servo installation Setting up new radio Dozens building tips Slab tall surfaces Aileron installation CREDIT CARD CUSTOMERS Use toll free number place order Have VIS4 MasterCard VISA ready calI.24HR5 DAY OR mail $3495 S & H Iforelge orders add $800 5/H PLANE VIDEO terCaPO Box 23128 Cliv Iowa 50325 Iowa residents add 4%sales tax PLAN vicevanG1Ou1LO 7 fliuvYti FREEI800I 38382 5VTOLL FREE 24HR24HR OR 5151223-0897 December 1990 157 FUEL WIZZARD THE WORLDS FASTEST AND MOST CONVENIENT FUEL PUMP EVER * FITS ALL GALLON FUEL BOTTLES * FAST ONE STROKE LL OUNCE OF FUEL * ALL FUEL SAFE GLO FUEL & GASOLINE SUGGESTED RETAIL $995 NOW JUST $750 ORDER FROM ACME PLASTIC PUMP CO P 0 BOX 24551 MINNEAPOLIS MN 55424 DEALER INQUIRIES INVITE) FILLS THE LARGEST MODEL FUEL TANKS IN SECONDS Krumpler/Irvine Continued page 157 loops deteriorating plane falling off top battery running down its time pian landing Spins require CG further back whit used initially removal two-ounce speed controller nose can get spin little power just top stall needs blast air across tail get going Stall turns easy Just go power push stick over Snap rolls level flight just easy Feed little Up elevator just see nose start rise pull stick right over full back zips right around actually pauses level flight before going spiral dive pause cue let go stick can make way down length field snapping 10 20 yards stall turn other end repeat comine other way glide moderate remember bi planes draggy better struts Nevertheless find biplane struts mildly offensive usually have Make first few approaches bat tery power left have option going around rumbling generally fly until detect slight drop power cut throttle come just last little bit reserve SCR cells have sharp discharge knee almost like running out fuel whereas SCs give about 30second warning airplane best calm weather steady breeze 1989 KRC Fun Fly quite windy varied constant fine Krumpler gusty flyable much fun best time have far has evening flying wind has dropped THE WIREMASTER TM bessderutcolter extra large handle bends 1/8-1/4 coils S/ 32-3116 music wire Wlre peep eliminated ANTI-KREEP WIRE LOCKTh free catalog also has hardware accessories JOM COMPANY 114 Washfrlgton T Dept Waukegan IL 60095 can shoot touch-and-go after another admiring set ting sun shines through covering put skis winter flying put Goldfire Flying qualities deterior ated slightly because extra drag weight skis nothing major Conclusion What might change sec ond Krumpler might shorten nose bit build straight wings ease ten dency towards nose-heaviness might turn something else air Krumpler has bit Tiger Moth itand little Bucker Jungmann well creative modeler might take few minor changes create nice small Scale Electric last point build Krum pler please send comments photo Martin Irvine 34 Beaver Crescent Kingston Ontario Canada K7M 7C 1 will answer correspondence would appreciate sending stamp RC Helicopters/Jolly Continued page 52 Concept 30 SX complete highperformance package expert fliers Kit Concept 30 SX arrived nicely packaged gold box vividly displaying SXs sleek lines lid slid off parts exposed evident Concept 30 SX pure Kyosho kit features excellent quality obvious thought put part SX shipped standard Concept struction manual two separate addendum sheets pertain specifically SX Kyosho understands multinational necessity clear pictures result manuals feature ex cellent illustrations just enough text take over rough spots standard Concept manual over 30 pages super piece work Anyone can build Concept merely looking pictures matching parts fas teners Concept 30 SX difficult assemble Following instructions letter took under seven hours start finish Youll have no problems Ill expand just briefly few steps feel may lacking text Step 11 Set clutch lining place glue thin CyA add glue first youll tiAWIUKUUKKILANE RAF WAS GLAD TO H4 YE t SPITFIRE RIJTITIA4D TO HAVE T pSIS 00 01501 Add Si 500 hEFIa Usa VISAs MC 015151050 015 COO Polyester HaM Laid Fibealaaa1/aS Soale Fuselage ngspan.50 noVas lete eels aod llardwaeFuse LengTh. 0353 lncttea Paclsages IndudadWeight.12 Lbs Meotrina Cut Foam Adog Cares Fonssr.2oy5OTs 108 Any 125 / Heavy Duty Styiene Clam Canopy1mm Legal / Flbertleas Cowl Fuse H Molded Stringers Easy RuildEsay Fly Esoellent Beginnem Waibjid SoossassIss AesHaWe 55550 reps s sed Fplns trawsa SeataTkea8t5jbs55alieht0tats IR5m5 5 LRta 054 Las 0th /S KIt AeettRhe Wue isa. a WutS leSs 750*5 Pes.ZeyW Ta toe Aan tss Jte Pun 551 a. P5351 P P-a ME-flOsS Nasmyx 1LU3Mesa Ms5oTan8 ml P5133 035331 l-amoaavImn never get lining belongs before sticks itself tableyou get pic ture step 13 main frame assembly call out 2 x 3 x 10mm-long self-tapping screws illustration shows could shorter hold cooling shroud place fact screws too long will bind up clutch bell step 19 tail rotor assembly make sure use plastic-compatible screw cement supplied kit good job tightening pitch ring nut slide bushing assembly could better designed allow positive grip during assembly would help ensure nut will separate bushing dur ing use step 21 dont glue new control rod sup ports place Instead decide go apply -in strip vinyl electrical trim tape boom Rub edges tape down well slide supports position twisting motion Youll find fit snugly removable can also put some tape boom under horizontal stabilizer help snug up step 31 installation canopy should use additional two screws front lower sides canopy keep decals lifting canopy front edge Id like add suggestions just no way intended detract Concept manual excellent build ing aid kit complete Concept yos would literally have try fail keep achieving success What radio Concept SX used Air tronics Vanguard six-channel FM system SGX gyro transmitter features dual rates elevator aileron has idle up setting pitch trim revolution mix throttle hold servo reversing switches todays standards Vanguard rates very basic heli system Unlike PCM 10 1024 hell pilots will able use everything Vanguard-type sys tem Its perfect beginner will per form contest system Novice Scale maybe far Intermediate since can per form upright maneuvers SGX system comes gyro mixer dedicated tail rotor servo features single adjustable gain reversing switch FAt caliber its perfect novice will want set gain up high authority adjust gyro suit taste pro gresses SGX will also find favor fixedwing tail-dragger pilots think its just ticket short-coupled Scale ship gets fe isty takeoff Check out couldnt easier install Vanguard performed admirably glitch think however suitable training SX will capable everything expert will want SX mind switched over Air tronics Spectra 7 PCM radio still pre microprocessor has enough bells whis tles allow competent pilot explore SXs inverted capabilities motivator power used standard 05 32 FSR H coupled Vortexs Eikohgiken C 30 muffler What can say about start idle produce lot powerall good things want heli motor C 30 seems help out power department has added advantage allowing adjust low idle mixture motor once course 162 Model Aviation Rubber ft Ongine Power Free Flight Display Control Line Eleotric Power RIC Airplenee new liluetrated 32 page tabloId size catalog US ft Canade $100 Foreigh $300 Penn Valley Hobby Center 837-A W Main St Lanadale PA 18446 215 368-0770 ZENOAH SACHS-DOLMAR & QUADRA ENGINES ERCOUPE TOMAHAWK & J-3 KITIEN KITS ZINGER & DYNATHRUST PROPS FUEL TANKS Carbon-Fiber Arrowahafte Ceconite & Glue DGA & MGA PILOTS Send $100 catalog JIM MESSERS QUALITY MODEL PRODUCTS Valley View Dr Box 43 Allegany NY 14706
Edition: Model Aviation - 1990/12
Page Numbers: 46, 47, 48, 49, 50, 51, 155, 156, 157, 162
NO OCR TEXT 1_ _ - iI-4La{ ______ tric-powered biplane looks like might actually have post-WW full-scale plane early homebuiltbut its Its entirely original design Build lot easy sport flying EMartin Irvine TWO WEEKS before 10th Annual KRC Electric Fun Fly found myself needing new airplane love NW biplanes course everyone knows Electric bipes require too much power overcome drag truly practical obvi ously have never seen Keith Shaws 60-size Stearman decided kept fuse lage fairly small number struts minimum should OKa nice slow flier What banged together two weeks what see test flew sun going down Friday September 15 11 hours before leave KRC meet Id like say flew right off board design ers have admit required three-fourths Right rudder two clicks Up elevator trim before flew straight Big deal thought amount rudder re quired because lack right thrust motor Small bipes often require sideand down-thrust haste forgot side-thrust tried model still required some right trim cant see warps anyway dont mind small amount trim down-thrust built way wing incidence 20 30 top bottom wings respectively sta bilizer incidence 2 O causes air plane fly slight downward angle ef fectively giving down-thrust flew number flights KRC meet terrific weekend anyone inter ested Electrics should attend least once got requests plans five people made think might have wider appeal article re sult specification table will tell what might want know about Krumpler just couple ad ditional notes needed first used DSC 075 motor sim ilar 075/550-size motors current generation complete kit Electric trainers sport planes bat tery pack Sanyo seven-cell 9005CR pack prop used Taipan 8 x 4 combination motor draws 19 amps calculates total power put 130 watts think airplane needs seven-cell pack use 550-type motor want reliable takeoffs grass Although can done six cells marginal much fun remotored Great Planes Goldfire motor has much poop usual 550 course ex pense much higher current over 30 amps current-limiting STW speed con troller wouldnt let 26 amps get through flight times short absurd tried Futaba MCR 4A re ceiver great success able use six-cell packs am getting ahead myself Lets build first Construction Wings make plywood master rib cut ribs sharp No11 blade center section ribs just trim A6 off top bottom surfaces Decide what size spars want make spar cut outs suit used /8 x /16 basswood spars rather uncommon sizeso might use /8 x bass spruce Don t use balsa spars wont strong weight saving would negligible Use medium weight straight-grained balsa rest wing dihedral brace ply goes between spars does shear webbing Dont leave webbing out weighs little adds lot stren2th can build either top lower wing first will constructed panel time Start laying down lower spar trailing edge Place ribs position angling root rib bit dihe dral add top spar dry ie no glue Eyeball everything assure straight use thin CyA glue things solid Add leading edge being careful shim up lined up top bottom ribs Glue wing tip pieces add vertically grained shear webbing between spars braced trailing edge gussets Now build other wing panel youre finished cut slot root ribs dihedral brace December 1990 47 No havent just landed underside view shows slight wing sweep generous tail mo ment translucent covering Barely visible fuse mount ahead lower wing cen ter section Bottom hatch Balsa rails keep motor pack seven 900SCRs centered Note wire yoke rear No 64 elastic 3A-ln dowel acts forward battery hold-down point Everythings mounted hatch base Yoke held CyA has stood some unexpected arrivals four notches sides clear cabane struts Join two halves epoxy have time make adjustments suring have correct dihedral inch side top wing 1 /2 side bottom wing Next A-in center section trailing edge piece can shaped added can leading edge A-in piece Glue center section sheet Keep mind spars flush covering dont sheet over strut fittings made A-in sheet notched interplane struts backed / ply just buttglued side ribs strong enough struts weaker wing structure will knock out break before damaging wing experience speaks Brace rear fitting %-in sq flush covering surface other wing built exactly same way Tail The stabilizer needs no explanation fin rudder built using old Free Flight technique called laminating Its easy strong looks great First cut A-in balsa blank form inside line fin rudder Dont bother wax anything Next cut seven strips soft A2 x x 24in balsa additional strip little wider Pin form down surface covered waxed paper Stack strips together using pins hold things place wrap around form slightly wider strip should inside next form use little tension pull ing strips around will find dry wood bends quite easily Once strips pinned place push laminations down flush build ing surface Now use thin CyA glue everything solid being careful get glue form slightly wider piece placed against form acts dam stop CyA sticking lam inations form Once glue has set unpin outline tum over CyA other side stack has set gently spring outline open will quickly see lam inations need glue Now thumbtack sheet fine sandpaper 48 Model Aviation Lower wing cutout radio bay has enough room lot Two 51338 right receiver battery pack sit middle Note mounted balsa floor grain across fuselage Minimal foam needed because lack vibra tion some should used protection rough landings fuselage holder on/off switch ahead wIng Construction wing outlined article Top view nose sans hatch Note side thrust DSC 075 motor Looks snug everything fits fairly easily bottom STW Sommeraur MK3 speed controller motor/controller connectors top Loose set connectors battery pack tached underside hatch XLR *8RL w/PLS I9ARTJNIRVINE 4 BRLRRj8& g Q8EL&R 6LFU- x -4 tic WfRE 4 8nL~ \\ Q N Cl 16 o5Q B l-OMERcN8 075 M0rc N 11~~~ 0 0fif i 0ji~MRIRVJNE 0 fl-VINe 51YI 0 TW PLANL OL BUDDr5HEFT IA UC NOj- VNCflcJLRUT INSIDE NDRINJNG S7Rflh ToPUJ1Io~JTH WIN& N 4BAL8R&HErT Q Q TE flat surface carefully sand out line smooth find works best hold under extended fingers sand cir cular motion Once reasonably smooth pin plan add other pieces trimming outline leave leading edge little long can act key rear fuselage upper surface Now can cut rudder free think will pleasantly surprised strong structure Fuselage Construct both basic sides 3/ square sheet best second side constructed over first small pieces wax paper glue joints pre vent two sides sticking together Note right side shorter left give built-in side thrust cabane struts will glued slotted balsa pieces fuselage Dry fit pieces groove accept 1/16 spring steel cabane wires before glu ing place Make sure slots inside surface fuselage Groove upper longerons accept cabanes add A6 sheet doubler inside both sides Note does run full length nose stops short motor bulkhead provide slot its insertion later Fill ward two bays /16 sheet Now add / x 3A6-in strips tail end let A6 sheet outside edge course time being care ful build right left sidearent assemble basic fuselage put gether upside down forward upper longerons flat against building board temporary Y6-in -sq crosspiece forward cabane mount permanent ones rear battery hatch leading trailing edges wing Now have basic box should square angles Check redo necessary cant expect plane fly straight looks like should have Chi quita painted side Once straight pull forward fuse lage together install motor bulk head Next draw rear fuselage together tail join checking straight ness Add remaining /l6 cross pieces Next bend landing gear sew landing gear bulkhead wire Spread epoxy glue over sewn joint glue assembly position fuselage doing might want temporarily attach lower wing check level rear fuselage has piece A-in sheet set between upper rear longe rons act base fin left leading edge fin little long can cut slot forward edge piece accept Dont add tail skid yet easier after have cov ered fuselage Now can add rear turtledeck form ers Cut slot center A6 x A-in stringer top center former Ad just things until stringer straight level glue place Next using straightedge very sharp blade cut slots other two stringers side equidistant center stringer upper longeron three stringers end up being flush last crosspiece just ahead fin Add diagonal bracing top bottom first add side bracing lower cowl sheeting should added yet Now get hatch Hold piece A-in sheet top trace along inside upper longerons Cut A-in sheet out leaving line Next carefully break out temporary crosspiece glued across forward center section struts landing gear bulkhead helps hold sides apart now Carefully sand hatch base until snug tight fit Glue formers place add sheeting two halves front back Now add side pieces easier add after adding sheeting before Trim cockpit outline notch sides cabane struts Add lower cowling A6 sheet wing dowels bits pieces nose Round off make nose look little like radiator Now its done Radio power installation found Continued page 155 Lower end interpiane struts Diagonal bracing apar rib iooka fiimsy Strut piastic straw roughiy-shapod balsa strip inside Wing hoids place appearance oniy Laminated outline technique fin rudder illustrated right Straight pieces brace outline against warping Rudder pushrod longer ideal because tight rear fuselage Note links use tubing keeper 50 Model Aviation Lower rear fuselage Simple tall skid dowel quite strong Note small brass locknut backing Quick Link Its railroad supplier Looks neat Dont overtighten youll weaken brass coupler fly off pavement consider using wire tall skid run antenna fin top 1116 PLYWOOD TOP WING 1/16 PLYWOOD ING DIHEDRAL BRACES DIHEDRAL- UPPER WING HERE AT EACH TIP BALSATWO STRIPS OF lAB I/B__________________ I/B3/16BASSWOOD3/161/4BALSAFILLPLY UNDERSIDE OF UPPER SPARS TOP 6 BOTTOMLEADING EDGE___________________ 1/16 BALSA SHEET 1/16 BALSA WEBTOPS BOTTOM BOTH 3/4 3/16 BALSA GRAINWINGS TRAILING EDGE R-3 BALSA FILL3/IA 1/4 BALSA LEADING EDGE 1/4 BALSA WITH _____1/64 PLY BACKING N-I N-I\WING STRUT N-S ____ N-Gil1SLOT 3/6 BALSA BALSA F-I R-26-3TRAILING EDGE F-2 B F-3HATCH EDGE I/B A SHEET~i3/43/IRTE -HATCH BASE6-I DIG MWCOT /16 WIDE SLOT WING DETAIL F-43/lA BALSA1/16IN RI AETER ASSEMA SHEETWING NAILS F51A6BALSA I/IA DIG MUSIC I: SHEETWINE CABANE F-6G-V4 3/IA SONOTE U I/IA BALSA SHEET DGUBLFR WITH LIGHTBHG HOLES 3/16 1/2 BALSA I/A 5/16 BALSA GROOVED FOR HATCH EDGE- SEECABANE3/16 50 AA5A F- CROSS SECT I/IA I/B PLY GI/4LONGTO F-4SA7 -- - --- 2 INCIDESCE I/B PLYWOOD OPTIONAL-MOTOR 3/IA SO BALSA UPRIGHT B CROSS PIECES MOTOR MOUNTSHEET ELS-WILLIAMS ELAGE SIDE VIEW /BROS ON DAVE 3/32 DIG MUSE WINEBROWN WHEELS LEAVE THE BOTTOM OF LAST I/IA BALSA SHEET FLUSH WITH OUTER EDGE WING SPAN WING AREA ELECTRIC MOTOR BATTERY PACK PROP SPECIFICATIONS I/N I6 BALSA STRINGER TYPICAL DIHEDRAL LOWER WINGI_ EACH TIP Il/B PLY 0 HEORAL BRACE 3/16 50 BALSA tB 3/16 50 BALSA 3/16 BALSA SHEET STAB 3/IA S/B BALSA 3/IA 1/3 BALSA 3/16 SQ BALSA HINGE TO SUIT C ELEV I/B PLYWOOD 3/32 DIG LANDING GEARMUSIC WINE SEE CONSTRUCTION DETAIL FRONT REAR I/A DIA MUSIC WIRE NOTCH TO GIVE CABANEEPOXY GRIP hPATTERN 0I23456 MODEL AVIATION KRUMPLER DESIGNED BY MARTIN IRVINE 39-I/U 500 55 IN SAC 075 SANYO 7 CELLTRACING BY 30E DEMARCO TAIPAN 5 4 RIGHTS RESERVED 0 0 I0 0 CD 0 CD 2 0 CD -I -L Co 0 0 U World Engines$25-$35 72 MHz NB receivers offered RCD types $6995 Other 27 50 53 72 75 MHz com plete RC service Speed controls chargers repaired P & H $5-$lO Tim Abrens/Aero Electronics 127 Route 6 Box 54J Austin TX 78737 72 MHz transmitters serviced Ace RC Futaba FM sticker$10 AM conversion $15 Alignment plus crystals$40-$5O Other 27 50 75 MHz bands ser viced Custom applications Ni-Cd peak detector chargers P & H $6-$9 Authorized RC Service 128 327 South Stage Coach Lane Fallbrook CA 92028 tel 1-601/728-0440 Open Wed nesday Thursday Friday Saturday 10 am-230 pm 72 MHz transmitters serviced Ace Air tronics Cannon Cox Futaba Hobby Shack Kraft Pro-Line others 72 MHz receivers offered RCD $6995 plus crystal$695 Ace$75$115 P & H $5-$8 Bill Slayton 129 1005 Phillips Drive Dumas TX 79029 E L Lltchfield 130 4707 Woodside Manor Tampa Fl 33624 tel 1-813/8785382 Peter Calvagna 131 1092 Becker School Rd Freeport IL 61032 Thomas Albrlght 132 7303 Stony Hill Rd Wake Forest NC 27587 Krumpler/Irvine Continued page 50 Krumpler threatening end up nose heavy put motor battery aft end hatch Two Y6-sq strips glued bottom hatch spac ing equal width power pack pack rested between Next wire yoke glued rear hatch angled dowel added forward end battery placed between wood strips held place #64 rubberband stretched between yoke dowel first time have used technique works well shall use again makes battery access easy hatch itself held #32 rubberband looped over hatch forward wing dowels Its crude effec tive going use MCR 4A re ceiver add cooling scoops sides nose top hatch will help keep receivers MOSFETs metal oxide-semiconductor field-effect transis torsEd cool efficient kept way Servos mounted far back possi ble put cross sheet /16 below bat tery pack placed receiver initially midsized FMlO7N its battery pack 5R300 mAh between lower wing speed controller Sommerauer Mk 3 25-amp 6- 14-cell unit under motor current-limiting de sign installed fuse under cowling anyway first saw particular arrangement issue newsletter Electric Model Flyers Southern Ontario EMF SO Two Sermos connector housings glued together piece /16 ply tween two small pieces /32 ply AEROMODEL GIANT SHARK ARC PRE-BUILT 0 SHARK $21495 SEE YOUR HOBBY DEALER EIRST SEND STAMPED #10 ENVELOPE POR INFO KINGS WAY RIG HOBBY SUPPLY 5559 RICHMOND HOUSTON TX 77056 DEALERS ONLY 1-800-621-7783 December 1990 155 Sound Supression Oesign High Thrust Efficiency Long Fiber Advanced Composite Material Proven Performance US Masters US Nation als Canadian Nationals World Champion ships Spoits Sizes 57x3 7x3 7x4 7x5 7x6 7x7 7x8 7x9 7x10$159EACH 8x4 8x5 BxB 8x7 8x8 SxS BxlO $179 EACH 9x4 9x5 9x6 9x7 9x8 9x9 9x10 $199 EACH 95x45 10x6 lOx 7 10x8 10x9 lOx 10 $229 EACH 11 xB 11 x7 11 xB 11 x9 12x6 12x7 12x8 ..$289EACH Competition 11 xlO 11 xli 11 x12 11 xl2W 11 x13 11 x14 12x9 12x9W12x10 l2xlOW 12x11 l2xllN 12x 12 12x12N 12x 13 12x13N 12x14 $795 EACH 135 x 125 135 x 14 14 x8 14x 10 14x 12 14x 14 144 x 105 144 x 12 $1295 EACH Contact local hobby dealer Manufactured Landing Products Knights Landing California glued inside housings order put contact under pressure assembly glued A2-in mounting plate turn mounted aircraft nice part about have fused system safety can use arming switch removing replacing fuse Off might want attach fuse airframe short length cord dont lose have used system number models though speed controller limits amperage fully stalled motor fuse doesnt blow al though certainly will control ler Later changed radio Futaba Electric radio MCR 4A receiver dropped weight about four oun ces sneezed Graupner 8 x 4 prop seven 900SCR Ni-Cd cells motor Goldfire now draws over 30 amps according DSC ammeter original current-limiting STW control ler wouldnt pass 26 amps amounts input over 200 wattsor about 100 watts per pound model weight Rocket-propelled biplanes cup tea substituted six-cell l200SC pack dropped peak current freshly charged pack 27 amps 162 watts still potent combination has poop original setup Interestingly requires side thrust before may due fact removal two-ounce speed controller nose aircraft moved CG aft bit made controls little sensitive added air scoops made plastic spoons nose increase airflow over MCR 4As MOSFETs con troller isnt supposed handle current magnitude However have run set seven 900SCRs down just cool ing see photos using Graupner 8 x 4 prop 30-plus amps ini tially shut down after 105 sec let cool got just 15 sec Therefore would guess would have worked air adding scoops much better MOSFETs As now land can feel MOS FETs cool touch remove battery pack have heard people having difficulty radios such shutting down motor too soon being able handle 15 amps Another local flier has similar results both MCR 4A units think troubles other people have must defec tive units some other installation problem complaint radio 50-Hz controller isnt very good fer rite motors time magnets will lose power sounds slightly rough lower throttle settings right applica tion think great little rig Certainly have respect now know what can Its keeper MtCfled Performance system TOP PERFORMANCE K&B ENGINES AirplaneMarine K&B FUELS K&B GLOW PLUGS 9 Blends4 Chsices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B Micro-Bailsons FILLtR K&B SUPER FOXY RESIN K&B THINNER K&B SUPER POXY PRIMER K&P IIPPR pesy PaINT note wiring connectors may order Use good stuff Cheap power systems need best expensive sys tems deserve have standardized con nectors sold Sermos same Anderson Power Poles available Hobby Horn Sermos Jomar SR number other Electric suppliers best avallable Similarly use specialty wire same suppliers youre sure something phone will help out right over phone object using wire minimize losses electrical system Theres no point wasting power dont need cost best especially compared cost airplane very small Covering Any iron-on film market will work well aircraft because strength wing thanks hard wood spars covered entire airframe lightest Coverite Micafilm V ozIyd us ing Balsarite adhesive find clear easier put colored gives airplane clear-doped tissue look also shows off construction rather well provides incentive good work careful adhere covering rib spar extra strength imparts can trim film wish over 156 Model Aviation 555 APCJ APC PROPELLERS CULPEPPEE C MODELS INC 2526 Washington DubuqueIA 52W1 31915334839 Micaflim Assembly Glue wing hold-down dow els rubberband bottom wing position Next slide formed center sec tion struts place Lift out Ae-dia holes fuselage until top wing sits indicated angle inci dence Robart incidence meter works well Remove make sure free surface oil grease notched provide good grip glue Smear slow-setting epoxy drip some holes reassemble Again check angle incidence checking upper lower wing tips same distance apart satisfied let set overnight Now top cross pieces bent bound center section struts soldered Ply wood strips used provide bearing sur faces positive location keying wing glued top wing cut ting away some film ensure ade quate adhesion used quite crude locat ing system because tight schedule building model plan shows abet ter can add some balsa strips simulate scalelike struts make sure wont foul battery hatch wing attachment finished care fully glue stab fin place making sure straight used Sig CA hinges original Williams Bros 2-in wheels used undercarriage About time tail skid can added nonfunctional interplane struts made slightly rounded /t6 balsa inside large plastic drinking straws de signed held place wing ten sion meant come out break before wing damaged case hard landing hitting something Now can balance airplane best procedure try move things around inside necessary achieve cor rect balance rather adding balance weights following summary originals weights 1 oz grams Top wing complete uncovered46 gm Balsarite adhesive3 gm Covered54 gm Covered lettered59 gm Bottom wing 3 grams less Fuselage complete dowels cabane wires landing gear no pushrods wheels cabane cross wiresun covered78 gm Balsarite adhesive2 gm Covered83 gm Stabilizer elevator uncovered 8 gm Coveredil gm Fin rudder uncovered4 gm CoveredS gm Total airframe12 oz Radio weight75 oz later MCR 4A RX35 oz SEE YOUR DEALER OR ORIER DIRECT PLEASE ENTER MY ORDER FORFUEL WJZZARDS AT $ 750 EACh POSTAGE PAID NAMESTREET_______________________ CITYSTATE_______________ ZIP_________ Motor weight connectors prop adapter9 oz Battery weight connectors 7 x 900SCRlO5 oz 6 x 12005CRuS oz Total flying weight STW reg ular radio 7 x 900s39 oz Total flying weight MCR 4A ra dio 6 x 1200s36 oz Flying As stated introduction original Krumpler required Right little Up trim Level flight maintained throttle quick takeoffs aer obatics require full nearly full throttle landing gear fairly far forward have ready correct swing takeoff isnt hard So far have ground looped Krumpler once its test flight before knew much right trim would neces sary takes off less 50 ft no wind less breeze keep flat after breaks ground gain little speed before start pulling much elevator Keep first flight two gentle until have feel airplane Later can throw around rudder throw quite sufficient elevator figure eights very small area Loops fairly straightforward require either nearly-full power lit tle dive first better wind Continued page 162 NOWATWO TAPE SET tape youve waiting finally herell youre new bobby just want learn secret wood plane construction YOU PLANE VIDEO Presents BUILDING IT RIGHT THE FIRST TIME FIRST NO-NONSENSE VIDEO OF WOOD AIRCRAFT CONSTRUCTION APPROX 4 HOURS ON eFuel tank installation eNew engine setup 0 Fuselage construction OBUILDING STRAIGHT C Installing pushrods C Covering film C Eliminating warps e Aligning Salancing C Final checkout ePLUS MUCH MORE! Radio installation Straight wing building Installing hinges C Shear webbing Applying PG cloth S Servo installation Setting up new radio Dozens building tips Slab tall surfaces Aileron installation CREDIT CARD CUSTOMERS Use toll free number place order Have VIS4 MasterCard VISA ready calI.24HR5 DAY OR mail $3495 S & H Iforelge orders add $800 5/H PLANE VIDEO terCaPO Box 23128 Cliv Iowa 50325 Iowa residents add 4%sales tax PLAN vicevanG1Ou1LO 7 fliuvYti FREEI800I 38382 5VTOLL FREE 24HR24HR OR 5151223-0897 December 1990 157 FUEL WIZZARD THE WORLDS FASTEST AND MOST CONVENIENT FUEL PUMP EVER * FITS ALL GALLON FUEL BOTTLES * FAST ONE STROKE LL OUNCE OF FUEL * ALL FUEL SAFE GLO FUEL & GASOLINE SUGGESTED RETAIL $995 NOW JUST $750 ORDER FROM ACME PLASTIC PUMP CO P 0 BOX 24551 MINNEAPOLIS MN 55424 DEALER INQUIRIES INVITE) FILLS THE LARGEST MODEL FUEL TANKS IN SECONDS Krumpler/Irvine Continued page 157 loops deteriorating plane falling off top battery running down its time pian landing Spins require CG further back whit used initially removal two-ounce speed controller nose can get spin little power just top stall needs blast air across tail get going Stall turns easy Just go power push stick over Snap rolls level flight just easy Feed little Up elevator just see nose start rise pull stick right over full back zips right around actually pauses level flight before going spiral dive pause cue let go stick can make way down length field snapping 10 20 yards stall turn other end repeat comine other way glide moderate remember bi planes draggy better struts Nevertheless find biplane struts mildly offensive usually have Make first few approaches bat tery power left have option going around rumbling generally fly until detect slight drop power cut throttle come just last little bit reserve SCR cells have sharp discharge knee almost like running out fuel whereas SCs give about 30second warning airplane best calm weather steady breeze 1989 KRC Fun Fly quite windy varied constant fine Krumpler gusty flyable much fun best time have far has evening flying wind has dropped THE WIREMASTER TM bessderutcolter extra large handle bends 1/8-1/4 coils S/ 32-3116 music wire Wlre peep eliminated ANTI-KREEP WIRE LOCKTh free catalog also has hardware accessories JOM COMPANY 114 Washfrlgton T Dept Waukegan IL 60095 can shoot touch-and-go after another admiring set ting sun shines through covering put skis winter flying put Goldfire Flying qualities deterior ated slightly because extra drag weight skis nothing major Conclusion What might change sec ond Krumpler might shorten nose bit build straight wings ease ten dency towards nose-heaviness might turn something else air Krumpler has bit Tiger Moth itand little Bucker Jungmann well creative modeler might take few minor changes create nice small Scale Electric last point build Krum pler please send comments photo Martin Irvine 34 Beaver Crescent Kingston Ontario Canada K7M 7C 1 will answer correspondence would appreciate sending stamp RC Helicopters/Jolly Continued page 52 Concept 30 SX complete highperformance package expert fliers Kit Concept 30 SX arrived nicely packaged gold box vividly displaying SXs sleek lines lid slid off parts exposed evident Concept 30 SX pure Kyosho kit features excellent quality obvious thought put part SX shipped standard Concept struction manual two separate addendum sheets pertain specifically SX Kyosho understands multinational necessity clear pictures result manuals feature ex cellent illustrations just enough text take over rough spots standard Concept manual over 30 pages super piece work Anyone can build Concept merely looking pictures matching parts fas teners Concept 30 SX difficult assemble Following instructions letter took under seven hours start finish Youll have no problems Ill expand just briefly few steps feel may lacking text Step 11 Set clutch lining place glue thin CyA add glue first youll tiAWIUKUUKKILANE RAF WAS GLAD TO H4 YE t SPITFIRE RIJTITIA4D TO HAVE T pSIS 00 01501 Add Si 500 hEFIa Usa VISAs MC 015151050 015 COO Polyester HaM Laid Fibealaaa1/aS Soale Fuselage ngspan.50 noVas lete eels aod llardwaeFuse LengTh. 0353 lncttea Paclsages IndudadWeight.12 Lbs Meotrina Cut Foam Adog Cares Fonssr.2oy5OTs 108 Any 125 / Heavy Duty Styiene Clam Canopy1mm Legal / Flbertleas Cowl Fuse H Molded Stringers Easy RuildEsay Fly Esoellent Beginnem Waibjid SoossassIss AesHaWe 55550 reps s sed Fplns trawsa SeataTkea8t5jbs55alieht0tats IR5m5 5 LRta 054 Las 0th /S KIt AeettRhe Wue isa. a WutS leSs 750*5 Pes.ZeyW Ta toe Aan tss Jte Pun 551 a. P5351 P P-a ME-flOsS Nasmyx 1LU3Mesa Ms5oTan8 ml P5133 035331 l-amoaavImn never get lining belongs before sticks itself tableyou get pic ture step 13 main frame assembly call out 2 x 3 x 10mm-long self-tapping screws illustration shows could shorter hold cooling shroud place fact screws too long will bind up clutch bell step 19 tail rotor assembly make sure use plastic-compatible screw cement supplied kit good job tightening pitch ring nut slide bushing assembly could better designed allow positive grip during assembly would help ensure nut will separate bushing dur ing use step 21 dont glue new control rod sup ports place Instead decide go apply -in strip vinyl electrical trim tape boom Rub edges tape down well slide supports position twisting motion Youll find fit snugly removable can also put some tape boom under horizontal stabilizer help snug up step 31 installation canopy should use additional two screws front lower sides canopy keep decals lifting canopy front edge Id like add suggestions just no way intended detract Concept manual excellent build ing aid kit complete Concept yos would literally have try fail keep achieving success What radio Concept SX used Air tronics Vanguard six-channel FM system SGX gyro transmitter features dual rates elevator aileron has idle up setting pitch trim revolution mix throttle hold servo reversing switches todays standards Vanguard rates very basic heli system Unlike PCM 10 1024 hell pilots will able use everything Vanguard-type sys tem Its perfect beginner will per form contest system Novice Scale maybe far Intermediate since can per form upright maneuvers SGX system comes gyro mixer dedicated tail rotor servo features single adjustable gain reversing switch FAt caliber its perfect novice will want set gain up high authority adjust gyro suit taste pro gresses SGX will also find favor fixedwing tail-dragger pilots think its just ticket short-coupled Scale ship gets fe isty takeoff Check out couldnt easier install Vanguard performed admirably glitch think however suitable training SX will capable everything expert will want SX mind switched over Air tronics Spectra 7 PCM radio still pre microprocessor has enough bells whis tles allow competent pilot explore SXs inverted capabilities motivator power used standard 05 32 FSR H coupled Vortexs Eikohgiken C 30 muffler What can say about start idle produce lot powerall good things want heli motor C 30 seems help out power department has added advantage allowing adjust low idle mixture motor once course 162 Model Aviation Rubber ft Ongine Power Free Flight Display Control Line Eleotric Power RIC Airplenee new liluetrated 32 page tabloId size catalog US ft Canade $100 Foreigh $300 Penn Valley Hobby Center 837-A W Main St Lanadale PA 18446 215 368-0770 ZENOAH SACHS-DOLMAR & QUADRA ENGINES ERCOUPE TOMAHAWK & J-3 KITIEN KITS ZINGER & DYNATHRUST PROPS FUEL TANKS Carbon-Fiber Arrowahafte Ceconite & Glue DGA & MGA PILOTS Send $100 catalog JIM MESSERS QUALITY MODEL PRODUCTS Valley View Dr Box 43 Allegany NY 14706