Hawk P-30 class has become popular cate gories out door Free Flight modeling can join ranks design thats proven winner John ODwyer WHY YOU ASK another P-30 swer should dear competitors heart P-30 lives up hopes designed really winand win does Sparrow Hawk definitely outper forms breed has placed con test its competed yet airplane maintains relative simplicity belies its capabilities As retired aeronautical engineer relative newcomer Free Flight modeling looking challenging event start off After reading rules roughed out first P-30 built flew itor tried Heavy ugly model barely got airborne Clearly better way decided use some experience education design betterperforming P-30 point lets review AMA rules P-30 40-gram minimum weight probably important consideration 30-in maximum dimension no long skinny efficient high aspect ratio wings 10 grams rubber use effectively freewheel plastic prop between 905 984 in diameter Are plastic props alike Other challenges became apparent de velopment progressed will cov ered later thing 40 years experience de signing full-scale aircraft will make totally obvious excess weight invariably primary reason poor performance Hence want competitive model keeping weight down should number consideration achieve need scale Any scale such pos tal scale weight watchers scale will Best though good threebeam laboratory scale calibrated grams 72 Model Aviation Sparrow Above A lot research went making simple-looking airplane consistent contest winner has become Fortunately hard work has already done re mains construct per plans instructions article Below author young friend Sean Bridges wind up again another trip Texas skies Thus equipped can weigh several piec es balsawood pick lightestor discover two apparenfly identical plas tic props actually differ weight two grams Also scale allows check youre flying maximum legal weight rubber arent shortchang ing yourself have simple postal scale calibrated ounces ounce equals 2834 grams 1 oz little 40 grams /4 oz slightly less 10 grams Since wingspan limited 30 low aspect ratio low wing loading seem best An aspect ratio betwecn 61 71 indicated lower limit several rea sons including rapid rise induced drag structural stability wingspan being compromise can least compensate using best possible air foil Airfoil requirements small slow Left When fastening monofilament line swivel use piece aluminum tubing crimped over lines end instead trying tie knot will inevitably sup out Right other end monofilament line permanently attached models left wing tip November 1988 73 balsa sheet trimmed shape before its formed around broom handle make body tube four pieces right glued together make wing mounting pylon aft end bulkhead mini swivel Once wing pops off its pylon dethermaliz ing remains connected fuselage piece monofilament line tied swivel pylon glued body tube CyA Placed shown acts partial exter nal bulkhead strengthening bodys center Cut out middle pylon save weight rear edge pylon notched cen ter snuffer tube Dark band around tube 24-hr epoxy Use sparingly its heavy plane like differ greatly what full-size aircraft need airfoils spe cifically designed low-speed regime considered Much has written subject Among authoritative works published Dieter Althaus based studies low-speed tunnel Stuttgart Germany Using P-30 model flight speed 8 10 ft per sec mea sured test gliding bleachers local gym best airfoil size speed appeared Sokolov Russian Glider section exhibited very good lift/drag ratio 601 tar bulator Lift/drag ratio best index gliding efficiency Sokolov mea sured nearly 80% higher easy-touse flat-bottomed Clark Y airfoil shape author lost first five Sparrow Hawks usual pop-up stab OTing failed bring back down Popping wing off way almost always gets model out thermal brings safely back down Left A common straight pin holds DT line place wing center rubberband secured Once band place lift line over pinhead rubberband will hold place against sandpaper Right band wrapped around fuselage strengthen area rear motor peg small rubberband keeps hollow peg place after tension rubber motor gone Lett The two side notcnes nob inc satety pin piace wouna moipr untii prop can installed safety pin piaced inc nose block prevent prop turning nose plug holding bands other backup hooked DT fuse lit 74 Model Aviation DT line runs along upper surface wing under hold-down rubberband back along left side fin over stab swivel end body tube Full-Size Plans Available Page 186 Fuselage first rolled tube fu selage building can kind fun begin selecting correct wood ex tremely important Whats required very straight-grained 3 x 36 x sheet medium-lightweight balsa Sig has good balsa have also found Mid west balsa carried local hobby shop very even-grained light /32 sheet thin enough can held up light check uniformity grain Reject sheets dark streaks indi cate harder-grained wood may crack rolled 3-in-wide sheet 1/3 thickness will make tube roughly 1 in diameter Thats bigger wound P-30 motor can save weight using smaller dia meter Trim /16 edge sheet along its full length cut off end length 281/2 Again save weight taper rear half %-in diame ter Referring photo prepared sheet cut two % x 14-in triangles part flat sheet will become tail end Apply two coats undiluted dope inside surface fuselage allowing about two hours drying between coats will seal inside against rubber lu bricant add strength cause tube curl like magic wet Locate broom handle something comparable % in diameter will serve mandrel body tube formed After dope thoroughly dry curl tube soaking balsa hot water bathtub about 10 min utes couple wet washcloths will hold balsa underwater soaks Place sheet broom handle wrap Ace bandage gauze strips some stretchable cloth will al Continued page 76 0 2 L aft 00 O S 2 / 012 / NH] 21 4 II ft -JK S 00 21 t0 S H 7 Li 7 E B 21 hft aa 20 Ca ft 50T ft 6 00 N 0 ft 0 L i1 K 02F 2 K4z November 1988 75 5 id 00 4 lx 4 LI Four keys black areas made two pieces dowel have split halves keys place accurate wing location pylon assured time 12 2- B aI 21Ja 2 L5kK j~ low wet tube diy handle dow el should large enough straight edges tube quite touch course tapered edges farther apart never fear will deal topic later Carefully set whole thing aside allow dry about 24 hours Cut 7-in piece off end sheet cut cross grain four equal pieces shown photo glued together edges using cyano acrylate CyA make 1% x 12-in strip will formed wing mount py lon Among CyAs Ive best luck Goldbergs Super Jet mediumviscosity fast-setting glue Make wing mount pylon using two symmetrical airfoils shown plans way make accurate copy obtain good dark Xerox copy full-size drawing Lay Xerox copy face down appropriate balsa sheet using dry flatiron MonoKote iron press down backside neatly transfer image balsa twice have two ribs Glue two ribs gether small spar-like rectangles shown Roughiy center subassembly 12-in-long A2 sheet equal amounts above below glue nose Working gradually attach side around trailing edge using CyA cut off excess rear Rough shape upper lower surfaces leave plenty material sanding time basic fuselage tube should dry Remove bandage slide mandrel straight sec tion tube can easily squeezed gether carefully secured CyA Once straight portion glued aft taper can closed Always keeping weight savings mind take care use too much CyA / ply bands shown drawing added both inside outside nose latter being rear rubber post two bands made -in-wide strips /-in-thick plywood about 3 long Make sure outside grain running direction /2-in strips Soak bands hot water wrap around mandrel used main body tube Hold plywood bands place rubberbands until dry adhere CyA Shape pylon mounting body tube sanding 180-grit paper wrapped around either mandrel fu selage body itself Attach aluminum snuffer tube angle shown using slowdrying metal bond epoxy Since epoxy very heavy sure use enough form narrow band around tube Sand both fuselage body tube pylon smooth surface reduce weight ribs pylon may cut out somewhat reduce weight further Locate glue pylon 6% 7 nose body important seam tube positioned bottom centerline before pylon attached Cut out disc / plywood making diameter aft end body tube Drill /l6 hole center insert through end small fishing swiv el short piece pin will prevent its re moval Secure swivel clear fiveminute epoxy Glue disc shown aft end fuselage body tube rein forcing couple small strips silk nylon single wrap h-in-wide silk fiveminute epoxy will strengthen front end well After epoxy has set up front cut three hes forward edge purpose upper po sition nose plug two side notches keep winding safety pin turning during transition winding motor installing prop fm made directly separate plan view facing right since cambered left turn flat left side Before begin make Xerox copies fin tail ribs use pat terns transferring wood use flat piece ceiling panel material work surface making wings tails first spray light coat Scotch spray adhesive board stick sec tion appropriate plan board spray plan section light coat same adhesive Caution sure keep spray light Cover plan section sheet wax paper latter works much better anything have tried cement super glue epoxy will stick damage plan Afterwards wax paper peels off plan leaving slightly sticky day Once youve made fin sand lightly paint outer edges coat Aero Gloss Balsa Sanding Sealer Cut Japanese tissue following grain longest dimension fin Coat struc ture thick dope lay tissue stretching out wrinldes problem areas dampen lit tle thinner trailing edge fin intended long enough extend through body tube add strength attachment Line up fin vertical wing pylon flat side fin should par allel body centerline stabilizer rest glued body tube left side about degree high aid left turn glide Water shrink fin tissue brush coat very thin nitrate dope Finish painting two coats thin sanding sealer waterproof outside body tube pylon sanding lightly between coats Wing fairly standard construction techaiques followed few suggestions order Iron Xerox copy main wing rib piece A2 plywood white painted aluminum carefully cut file shape Use template cut out ribs Stack balsa ribs us ing two pieces scrap /6-sq balsa 76 Model Aviation ii 0 m 0 K I 1 0 -I ii 0 z z 0 I0 C C n 0 z 0 z C, 0 -u 0 -a m I m 0 Q C -I CD C, C 0 C, 1 0 U 0 0 01 0 LzU N 0 C S S. S. CA S. CA x oo x x oo mini 01 x oo x S. x U spar grooves Sand stack ribs uniform contour length Pin down trailing edge waxpaper-covered plan using some scrap piec es wood block up forward edge /32 46-sq rib jig strip located about ard trailing edge preparation assures accurate undercamber extremely important low-speed airfoil triangular dihedral checker used assure center ribs set proper angle prior gluing place completed half removed plans propped up correct dihedral gle glued together quite bit Super Jet CyA rather steep V di hedral V saves about 1 grams weight over polyhedral configuration Cover Japanese tissue grain running spanwise turbulator made model railroading HO gauge scale 2 x 4s wing finished free warps washin washout makes much easier check prior flying ses sion generous amount dihedral correct pylon height will lessen need intentional wing warps Stabilizer Construction straightforward Use lightweight wood can get away coat dope Ft Worth TX coat does job live near water may have use two coats Just keep light possible Note liffle notch trailing edge center mates short peg 1/16 dowel added point rear end body help keep stab line bottom peg also keeps stab hold-down rubber body pre vents interfering dethermal izer DT swivel Propeller assembly Only few plas tic props available suitable P-30 models common Japanese rounded-tip type come green blue silver-gray doesnt seem verifiable difference among some people claim silver ones better propellers 9%-in di ameter 7-in pitch weigh 68 71 grams Another prop style now imported Europe type has square tip has same 9%-in diameter rounded-tip type has 9-in nominal pitch weighs seven grams As far know props available yellow FAT Model Supply carries facsimile prop however gram heavier original fre quently out balance AMA rules illegal shave sand P-30 prop lighten balance comparative evaluation per formance type propeller three different nose block assemblies con structedone round-tip prop Continued page 78 IWiVG MFG Tigerskini4 WHAT DO YOU CALL THE BEST SHEETING MATERIAL FOR FOAM WING CORES Wing Mfg pioneered foam core wing construction early 60s have used everything tangowood 002 stainless steel sheeting last few years have using pressure laminates evolved R & 0 work Uncle Sam Tigurskins pre-finish high density posterboard material clear laminated plastic film top simply apply contact cement such Styro-Stick adhesive cores sheeting press sheeting Onto cores material pliable can easily wrap around leading edges Tigerskins CHECK THESE FEATURES Superior strength weight ratio Superior bond capability foam 001 per sq temperature stability Smooth high gloss finish Superior resistance nitro fuel Superior resistance weather Easy apply Low low cost 01/64 23 35 size Comes following colors Waco Red Polar White Insignia Blue Sun Yellow $495 PER SHEET // pk00417 ORDERING Send check money order required amount Add $395 shipping 1 6 sheets Add $749 shipping 7 12 sheets SEND TO Wing Mfg P0 Boa 33 Crystal Lake IL 60014 Illinois Residents add 6 1/20/0 sales tea Super Styro-Stick wing skin adhesive $598 16 oz Can Item #601 can does wing up 70 No eatra shipping cost ordered Tigerskins See Tigerakins Chicago Model & Hobby Show Booth 1735 SEND $350 FOR CATALOG November 1988 77 ORDERS SHIPPED DAY RECEIVED WARBIRD VIDEOS VHS OR BETA DUR 23RD YEAR R ANY TWO VIDEOS ONLY $7595 ANY 3 VIDEOS ONLY $19795 SPECIAL IMTRDD6TDRY OFFEALL IVIDEOS ONLY $19995 WARBIRD CHECKOUT VOL 1 Flying P-40 Warhawk Corsair Hellcat SB2-A Buccanneer Avenger NF 1325 Programs2 Hr Only $3995 WARBIRD CHECKOUT VOL II Flying P-38 Mitchell Bomber P-61 Black Widow Invader NF 1454 Programsi 00 Mm Only $3995 WARBIRD CHECKOUT VOL III Flying P-Si Mustang A-20 Bomber P-39 Introduction P-39 Advanced NF 1514 Programslb Mm Only $3995 CALL TOLL FREE CREDIT CARDS Li J Day Night California outside USA 213 827-8666 Shi pin Paid Continental US-Foreign add $500 0 California residents add 6 1/2% tax NFVIDEQ LIBRARY 2554 LINCOLN BLVD #568 MARINA DEL REY CA 90291 PRECISION MODEL PRODUCTS ZZ7jjJosM Made U S BARSTOCK ALUMINUM SPINNERS Part NoSize TT-150-B .1-112 TT-175-B .1-314 TT-200-B 11-225-B 14 11-226-B 2114 FAt . TT-250-B .. 2-1/2 11-251-B . 2-1/2FAI .. 11-275-B 3/4 11-276-B 314 FAt .. 11-300-B 11-301-BFAI 11-325-B .. 3-1/4 . TI-350-B . 2 TT-375-B . 3-3/4 . TT-400-B 4 RetailApprox PriceWeight $1395058 02 149509502 1595180oz 169516002 189515002 189519002 209517002 229522002 249520002 2695260oz 289525002 369534002 499547002 5995520oz 699557002 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available Sizes Add $300 Per Spinner PROP NUT ADAPTORS Part No Size 11-140A . 1/4-28 T1-147A -28/7mm 11-610-A 6 x 10mm 11-710-A 10mm 11-516-A 5/16-24 11-518-A 5/16-24/8mm 11-810-A 8 x 10mm 11-825-A 8 x 125mm 11-375-A 3/8-24 11-125-A lOx 125mm Approx Weight 061 oz 061 oz 063 oz 0 82 oz 076 oz 076oz 076 oz 075 oz 117 oz 115 oz 3 Pieces Nut Washer Machined Bushing Add $350 Shipping Handling Prices subject change notice ROMCO MFG INC OX 836 SOUTH HOUSTON TEXAS 77587 713 943-1867 square-tip prop dummy nose same weight glide tested times bleachers local Indoor site square-tip prop consist ently showed approximately 15% longer en durance other types probably due its higher pitch lower blade area higher pitch has also appeared help climb reducing initial difficult-tomanage acceleration increasing length prop run small degree havent discovered method accurately determining prop gave P-30 higher climb prop nose block assembled standard way freewheel notch prop will work better last longer short outer end shaft bent first about 950 small bend radius pos sible Assemble bend hooked part last Assembly first five Sparrow Hawks lost thermals though conven tional pop-up-tail dethermalizer acti vated Two disappeared straight up taught us very light wing loading P-30 requires something reliable standard DT method have used last five ships variation system first used Ken Wer nicke locally may have invented George Xenakis works like DT fuse like Pecks 3/10-in-diameter lightweight fuse burns through #32 rubberband wing [ hold-down wing pops off re tained 12-lb-test monofilament fish ing line attached wing tip swivel tail end fuselage freewheel prop spinning wing re strain model during fall Using system Sparrow Hawk has never failed break out strongest thermal yet model has landed con crete runways prop nose breaking slight drawback method can difficult extricate model tree fishing line wrapped around branches solution simply cut line carry extra sup ply Dont try tie fishing line short piece Y16-diameter aluminum tubing squeezed pliers both easier adjust reliable short piece head end straight pin protrudes top wing centerline assemble wing body fishing line pulled tight tail over stab around pin out wing tip Monofilament line has sufficient stretch stay taut its proper length wing hold-down rub berband goes over line hold place during flight wing place check square body centerline Glue four keys made split halves 1A-in dowel onto wing will serve guides ensure accurate positioning reattaching wing Continued page 175 @cMlPL 8b 78 Model Aviation Retail Price S495 495 495 495 495 495 495 495 595 595 t1C IN SPIHHJ11 WELL---- YR GOT THE PLANE IN BUT WHERE ARE WE GONNR 0 -v /0 lizer braces 2/ x -in softwing TEs 1 x 1 x 4-in soft blocknose & tail blocks Other Wood l%2 x x 19-in hardwood stripflap & eleva tor joiners plywood approx 1 x 7 firewall landing gear bulkhead bellcrank mount 1A x x 13-in hardwoodmotor mounts Other Materials Plans Building board Straight pins Wax paper 1Cox Tee Dee 049 051 engine 1propeller 6 x 4 Cox plastic Top Flite Zinger wood 11-in plastic spinner Ace RC Inc 1-oz wedge fuel tank Perfect #20 /s x 4-in brats tubingtank vent extension leadout guides 2 small plastic flexible fuel line /16 x 28-in music wtrepushrods landing gear 032 x 4-in music wiretailskid 12-in bellcrank mounting hardware Perfect comparable 36-in length braided lead-out line Perfect com parable 1 pairflying wire clips Perfect Du-Bro com parable 1 pair1%-in-dia plastic wheels Sig comparable 1 pair/s-in wheel collars Perfect Du-Bro comparable 42-56 x -in engine mounting bolts locknuts 2small control horns Perfect comparable flaps elevator 4wire pushrod keepers /6-in-dia music wire 48% x -in similar size fabric control surface hinges Aliphatic resin glue Franklin Tite Bond compar able Five-minute epoxy glue Duro comparable Garnet paper 100- 200-grit Norton compa rable Wet-or-dry paper 400-grit 3M comparable 1 sheetlightweight silkspan Fuel-proof dopeSig clear sanding sealer Diana Cream Stearman Red comparable 1-in numerals AMA license number 1 set012-inx 35-ft braided steel flying wire Sul livan comparable 1A control handle Sullivan comparable Cox Super Power Glow Fuel above parts materials should available local hobby shop Theres word some streets supplies Con trol Line models arent available anymore weve found true able secure everything needed build Lil Bit other models Johnny Clemens Hobby Counter Dallas know other shops stock order Control Line supplies So dont accept Geewe cant get anymore cause its just true Control Line alive Sparrow Hawk/ODwyer Continued page 78 Sparrow Hawk flies best four strands 3/6-in rubber Ten grams FM Champion rubber will 78 80 long Wash off powder coats rubber soapy water Use following method tying rubber will never slip Tie single overhand knot close end possible Laying two ends adja cent other tie another overhand knot two strands Use liberal amounts Continued page 178 Finest Kits Youll Ever Buy Build TraIn-Air 20 Train-Air 40 Sport-Air 40 Bel-AIr 40 40 Hydro-Floats rsa eesy handling uperior serobetic modern looking sport exhibition biplane has filled 55, 6 75 lbs 148 185 207-4901M1 Wise & Uastereeu4ed 1 KIT FEATURES Polyester fiberglass fusalage cowling retractable landing 92 wingspan gear Foam cores wing stab Available major production variations F4F-3 -3A -4 FM-i FM-2 Semi-Kit Fusalage cowling foam cores wing stab canopy retractable landing gear plans$27500 Complete Kit Everything listed semi-kit plus wood parts hardware necessary complete kit including 1/64 plywood sheeting wings$45000 Deluxe Kit Complete kit fusalage preassembled $85000 wings stab presheeted control surfaces prebuilt Information Package $100 VISA/MasterCard accepted add $1500 sh pp ng daho es add 5% Sa es tax Classic Glass PO Box 503 Blackfoot Idaho 83221-0503 Mike Zamber 208 785-2309 November 1988 175 fine tine kits ate machine cut sasist building reel show 80 has fully summetricel wing sections gives gresteat potential serobstic er upflght Inverted ship cspsble very slow close-In type flight right up robatic schedule can muster Classic Glass Grumman Wildcat B limEd ATIIE BEST IN ELECTRIC FLIGHT SPECIALIZING IH ASTRO FLIBHT SYSTEM -ENflI 111 ___________________________________________________ 1 I -RRl i 5l 1j CS Flight SgsteNs 31 Perrj Street Hiddlebero M 023483117 Phone 617947-2905 6 9 P H Go . Fredy Glow PIL 15 volt saliva lubricate knot pulled very tight small knots acting limit stops Cut off excess Coat rubber good grade rub ber lube install body tube push stick adequate length rear rubber support tube retained small rubberband shown photo Put two small rubberbands front end body tube behind little trian gles bands serves backnp difficult replace mo tor wound Cut short piece DT fuse slide snuffer tube use pair tweezers hold back wing mount rubberband sure positioned designed modernDealer hnuerle ported engines Dealer Inquiries Invited S Part Cam*ea% Auos 9w against fuse once latter place against snuffer tube Check center-of-gravity prop installed should balance rear spar bot tom surface wing off either direction little lead tape needed light end course out-of-balance situation can avoided entirely waiting until time glue pylon onto body Check Sparrow Hawk over warps wing tail steam out neces sary plan use model competi tion put AMA number right panel name address some plane Im usually eager go fly write AMA number black marking pen use mail address stickers name Since lost P-30s have returned maybe should also mention reward address label Flying Wait calm day test fly Before flying session lubricate prop shaft thin oil such sewing machine oil type comes neat pen cil dispenser fits nicely toolbox Test glide shim trim rear stab support until obtain slowest possi ble glide stalling Using winder put about 200 turns motor use various holes notches flagged safety pin see pho tos obvious Light DT fuse another piece fuse Never use match cigarette lighter light fuse air plane nitrate dope tissue al explosive WILLIAMS ACCESSORIES BROTHERS 4 PILOTS STANDARD TSMAN 0 RACING TAR VINTAGE TH CONTOUR BALLOON EN AGE 178 Model Aviation 10 Sparrow Hawk/ODwyer Continued page 175 HI-TECH ENCODER microprocessor based encoder board designed replace encoder board Futaba Conquest Ace Silver Seven transmitters compatible other AM FM radios market FEATURES complete calibration system use trimpots stores calibration constants four aircraft maintained during power off can mix first five channels other first five channels variety configoratiom exponential trim five strengtlss mixing expo trim can turned off during flight contrul trun throttle cntoff dual-rates servo reversing outputs four eight channels POWER REQUIREMENTS 32ma @ 96vdc SIZE 3 x45 x 75 inches SEND $400 installation operation manual oaly $17500 completely assembled tested encoder installation operation manual Please stare transmitter nwdel number channels Add $500 shipping handling EMULATION ELECTRONICS 2206 S Lynn Urbana 1L61801 217-344-8740or217-4697647 PARABELLUM 1975 July first issue 1976 197701982 197801983 1979-9-4-9641980-9--4-9&5198101986 i0 0 0 i0 Enclose separate $2200 check set ordered NO CASH NO CHARGES I I I I I r Print carefully shipping label II II Name II Street Addresa HStateZIP II Make checks payable AMA Send orders Academy Model Aeronautics 1810 Samuel Morse Dr Reston VA 22090 Linrnrn. urn urn ml Launch model positioning slightly nose up little left wind thrust line angles adequate model should gently climb right spiral about 10 seconds glide large left circle use short DT fuse forewarned Sparrow Hawk could startle disassembling itself air coming straight down plane does climb 200 turns flies much faster glide speed downthrust should reduced flight speed slow theres no climb try find some peppier rubber speed up right turn tight very lit tle climb reduce right thrust try again 200 turns Always use DT fuse simplest test flight things look good gradually increase number turns 650 700 about 500 turns will encounter so-called knee-in-the-torque curve sharply rapid rise potential power output Its zone Scale sport fliers tend give up win contest have keep trimming model zooms near-vertical 50 ft drops off right center-of-gravity should moved aft elevator angle reduced correct glide Dont change thrust line plane flew well 200 turns entire books have written adjusting Free Flight models theres still no substitute lot practice litfie experimenting own great deal can learned small model like P-30 anxiety worry associ ated flying bigger expensive After crashing P-30 wouldnt such big deal hold back optimal glide remember freewheel prop way out front de stabilizing influence functions gyro Therefore slower glide less effect prop will have Ill see next contest bring Sparrow Hawk well both have win ners Good luck Reno/Berliner Continued page 92 next year 1973 saw quite few rec ords overturned Lyle Shelton Wright R-3350-powered Bearcat turned time trials record 427 mph finals record 428 mph Formula Falck set qualifier record 235 mph Cote won finals 231 mph Among small field Sport Biplanes new all-metal Sundancer flown Sid White recordsetting 194 mph time trials 195 mph finals AT-6 time trials winner Jim Mott 211 mph Bill Turnbull took finals 207 mph 1974 Lyle Shelton came through another time trials record 432 mph Un limited bowed Ken Burnstine 382 mph finals hot ones dropped out Formula Ray Cote also scored record speeds 240 mph Name Street Address city State Zip HOBg RNATIONAL iNc November 1988 179 Modelers aioice High Quality Convenient Size Modest Price Jr Kwik Set Epoxy 5 OL $695 Gas Model Products 8773 Russet Dr Cincinnati OH 45239 dealer call 513-385-7398 order direct add *1 50 postage AMA INATONAII CENTENFOR Collectors Notice Just released AMA Museum BACK ISSUES Model Aviation magazinesNEW original car tons sale YEAR SETS ONLY Check selections below send SEPARATE $2200 CHECK individual set Orders will filled first-come basis set request sold out check will returned being cashed Limited Quantities Sets Are Complete L VIA
Edition: Model Aviation - 1988/11
Page Numbers: 72, 73, 74, 75, 76, 77, 78, 175, 178, 179
Hawk P-30 class has become popular cate gories out door Free Flight modeling can join ranks design thats proven winner John ODwyer WHY YOU ASK another P-30 swer should dear competitors heart P-30 lives up hopes designed really winand win does Sparrow Hawk definitely outper forms breed has placed con test its competed yet airplane maintains relative simplicity belies its capabilities As retired aeronautical engineer relative newcomer Free Flight modeling looking challenging event start off After reading rules roughed out first P-30 built flew itor tried Heavy ugly model barely got airborne Clearly better way decided use some experience education design betterperforming P-30 point lets review AMA rules P-30 40-gram minimum weight probably important consideration 30-in maximum dimension no long skinny efficient high aspect ratio wings 10 grams rubber use effectively freewheel plastic prop between 905 984 in diameter Are plastic props alike Other challenges became apparent de velopment progressed will cov ered later thing 40 years experience de signing full-scale aircraft will make totally obvious excess weight invariably primary reason poor performance Hence want competitive model keeping weight down should number consideration achieve need scale Any scale such pos tal scale weight watchers scale will Best though good threebeam laboratory scale calibrated grams 72 Model Aviation Sparrow Above A lot research went making simple-looking airplane consistent contest winner has become Fortunately hard work has already done re mains construct per plans instructions article Below author young friend Sean Bridges wind up again another trip Texas skies Thus equipped can weigh several piec es balsawood pick lightestor discover two apparenfly identical plas tic props actually differ weight two grams Also scale allows check youre flying maximum legal weight rubber arent shortchang ing yourself have simple postal scale calibrated ounces ounce equals 2834 grams 1 oz little 40 grams /4 oz slightly less 10 grams Since wingspan limited 30 low aspect ratio low wing loading seem best An aspect ratio betwecn 61 71 indicated lower limit several rea sons including rapid rise induced drag structural stability wingspan being compromise can least compensate using best possible air foil Airfoil requirements small slow Left When fastening monofilament line swivel use piece aluminum tubing crimped over lines end instead trying tie knot will inevitably sup out Right other end monofilament line permanently attached models left wing tip November 1988 73 balsa sheet trimmed shape before its formed around broom handle make body tube four pieces right glued together make wing mounting pylon aft end bulkhead mini swivel Once wing pops off its pylon dethermaliz ing remains connected fuselage piece monofilament line tied swivel pylon glued body tube CyA Placed shown acts partial exter nal bulkhead strengthening bodys center Cut out middle pylon save weight rear edge pylon notched cen ter snuffer tube Dark band around tube 24-hr epoxy Use sparingly its heavy plane like differ greatly what full-size aircraft need airfoils spe cifically designed low-speed regime considered Much has written subject Among authoritative works published Dieter Althaus based studies low-speed tunnel Stuttgart Germany Using P-30 model flight speed 8 10 ft per sec mea sured test gliding bleachers local gym best airfoil size speed appeared Sokolov Russian Glider section exhibited very good lift/drag ratio 601 tar bulator Lift/drag ratio best index gliding efficiency Sokolov mea sured nearly 80% higher easy-touse flat-bottomed Clark Y airfoil shape author lost first five Sparrow Hawks usual pop-up stab OTing failed bring back down Popping wing off way almost always gets model out thermal brings safely back down Left A common straight pin holds DT line place wing center rubberband secured Once band place lift line over pinhead rubberband will hold place against sandpaper Right band wrapped around fuselage strengthen area rear motor peg small rubberband keeps hollow peg place after tension rubber motor gone Lett The two side notcnes nob inc satety pin piace wouna moipr untii prop can installed safety pin piaced inc nose block prevent prop turning nose plug holding bands other backup hooked DT fuse lit 74 Model Aviation DT line runs along upper surface wing under hold-down rubberband back along left side fin over stab swivel end body tube Full-Size Plans Available Page 186 Fuselage first rolled tube fu selage building can kind fun begin selecting correct wood ex tremely important Whats required very straight-grained 3 x 36 x sheet medium-lightweight balsa Sig has good balsa have also found Mid west balsa carried local hobby shop very even-grained light /32 sheet thin enough can held up light check uniformity grain Reject sheets dark streaks indi cate harder-grained wood may crack rolled 3-in-wide sheet 1/3 thickness will make tube roughly 1 in diameter Thats bigger wound P-30 motor can save weight using smaller dia meter Trim /16 edge sheet along its full length cut off end length 281/2 Again save weight taper rear half %-in diame ter Referring photo prepared sheet cut two % x 14-in triangles part flat sheet will become tail end Apply two coats undiluted dope inside surface fuselage allowing about two hours drying between coats will seal inside against rubber lu bricant add strength cause tube curl like magic wet Locate broom handle something comparable % in diameter will serve mandrel body tube formed After dope thoroughly dry curl tube soaking balsa hot water bathtub about 10 min utes couple wet washcloths will hold balsa underwater soaks Place sheet broom handle wrap Ace bandage gauze strips some stretchable cloth will al Continued page 76 0 2 L aft 00 O S 2 / 012 / NH] 21 4 II ft -JK S 00 21 t0 S H 7 Li 7 E B 21 hft aa 20 Ca ft 50T ft 6 00 N 0 ft 0 L i1 K 02F 2 K4z November 1988 75 5 id 00 4 lx 4 LI Four keys black areas made two pieces dowel have split halves keys place accurate wing location pylon assured time 12 2- B aI 21Ja 2 L5kK j~ low wet tube diy handle dow el should large enough straight edges tube quite touch course tapered edges farther apart never fear will deal topic later Carefully set whole thing aside allow dry about 24 hours Cut 7-in piece off end sheet cut cross grain four equal pieces shown photo glued together edges using cyano acrylate CyA make 1% x 12-in strip will formed wing mount py lon Among CyAs Ive best luck Goldbergs Super Jet mediumviscosity fast-setting glue Make wing mount pylon using two symmetrical airfoils shown plans way make accurate copy obtain good dark Xerox copy full-size drawing Lay Xerox copy face down appropriate balsa sheet using dry flatiron MonoKote iron press down backside neatly transfer image balsa twice have two ribs Glue two ribs gether small spar-like rectangles shown Roughiy center subassembly 12-in-long A2 sheet equal amounts above below glue nose Working gradually attach side around trailing edge using CyA cut off excess rear Rough shape upper lower surfaces leave plenty material sanding time basic fuselage tube should dry Remove bandage slide mandrel straight sec tion tube can easily squeezed gether carefully secured CyA Once straight portion glued aft taper can closed Always keeping weight savings mind take care use too much CyA / ply bands shown drawing added both inside outside nose latter being rear rubber post two bands made -in-wide strips /-in-thick plywood about 3 long Make sure outside grain running direction /2-in strips Soak bands hot water wrap around mandrel used main body tube Hold plywood bands place rubberbands until dry adhere CyA Shape pylon mounting body tube sanding 180-grit paper wrapped around either mandrel fu selage body itself Attach aluminum snuffer tube angle shown using slowdrying metal bond epoxy Since epoxy very heavy sure use enough form narrow band around tube Sand both fuselage body tube pylon smooth surface reduce weight ribs pylon may cut out somewhat reduce weight further Locate glue pylon 6% 7 nose body important seam tube positioned bottom centerline before pylon attached Cut out disc / plywood making diameter aft end body tube Drill /l6 hole center insert through end small fishing swiv el short piece pin will prevent its re moval Secure swivel clear fiveminute epoxy Glue disc shown aft end fuselage body tube rein forcing couple small strips silk nylon single wrap h-in-wide silk fiveminute epoxy will strengthen front end well After epoxy has set up front cut three hes forward edge purpose upper po sition nose plug two side notches keep winding safety pin turning during transition winding motor installing prop fm made directly separate plan view facing right since cambered left turn flat left side Before begin make Xerox copies fin tail ribs use pat terns transferring wood use flat piece ceiling panel material work surface making wings tails first spray light coat Scotch spray adhesive board stick sec tion appropriate plan board spray plan section light coat same adhesive Caution sure keep spray light Cover plan section sheet wax paper latter works much better anything have tried cement super glue epoxy will stick damage plan Afterwards wax paper peels off plan leaving slightly sticky day Once youve made fin sand lightly paint outer edges coat Aero Gloss Balsa Sanding Sealer Cut Japanese tissue following grain longest dimension fin Coat struc ture thick dope lay tissue stretching out wrinldes problem areas dampen lit tle thinner trailing edge fin intended long enough extend through body tube add strength attachment Line up fin vertical wing pylon flat side fin should par allel body centerline stabilizer rest glued body tube left side about degree high aid left turn glide Water shrink fin tissue brush coat very thin nitrate dope Finish painting two coats thin sanding sealer waterproof outside body tube pylon sanding lightly between coats Wing fairly standard construction techaiques followed few suggestions order Iron Xerox copy main wing rib piece A2 plywood white painted aluminum carefully cut file shape Use template cut out ribs Stack balsa ribs us ing two pieces scrap /6-sq balsa 76 Model Aviation ii 0 m 0 K I 1 0 -I ii 0 z z 0 I0 C C n 0 z 0 z C, 0 -u 0 -a m I m 0 Q C -I CD C, C 0 C, 1 0 U 0 0 01 0 LzU N 0 C S S. S. CA S. CA x oo x x oo mini 01 x oo x S. x U spar grooves Sand stack ribs uniform contour length Pin down trailing edge waxpaper-covered plan using some scrap piec es wood block up forward edge /32 46-sq rib jig strip located about ard trailing edge preparation assures accurate undercamber extremely important low-speed airfoil triangular dihedral checker used assure center ribs set proper angle prior gluing place completed half removed plans propped up correct dihedral gle glued together quite bit Super Jet CyA rather steep V di hedral V saves about 1 grams weight over polyhedral configuration Cover Japanese tissue grain running spanwise turbulator made model railroading HO gauge scale 2 x 4s wing finished free warps washin washout makes much easier check prior flying ses sion generous amount dihedral correct pylon height will lessen need intentional wing warps Stabilizer Construction straightforward Use lightweight wood can get away coat dope Ft Worth TX coat does job live near water may have use two coats Just keep light possible Note liffle notch trailing edge center mates short peg 1/16 dowel added point rear end body help keep stab line bottom peg also keeps stab hold-down rubber body pre vents interfering dethermal izer DT swivel Propeller assembly Only few plas tic props available suitable P-30 models common Japanese rounded-tip type come green blue silver-gray doesnt seem verifiable difference among some people claim silver ones better propellers 9%-in di ameter 7-in pitch weigh 68 71 grams Another prop style now imported Europe type has square tip has same 9%-in diameter rounded-tip type has 9-in nominal pitch weighs seven grams As far know props available yellow FAT Model Supply carries facsimile prop however gram heavier original fre quently out balance AMA rules illegal shave sand P-30 prop lighten balance comparative evaluation per formance type propeller three different nose block assemblies con structedone round-tip prop Continued page 78 IWiVG MFG Tigerskini4 WHAT DO YOU CALL THE BEST SHEETING MATERIAL FOR FOAM WING CORES Wing Mfg pioneered foam core wing construction early 60s have used everything tangowood 002 stainless steel sheeting last few years have using pressure laminates evolved R & 0 work Uncle Sam Tigurskins pre-finish high density posterboard material clear laminated plastic film top simply apply contact cement such Styro-Stick adhesive cores sheeting press sheeting Onto cores material pliable can easily wrap around leading edges Tigerskins CHECK THESE FEATURES Superior strength weight ratio Superior bond capability foam 001 per sq temperature stability Smooth high gloss finish Superior resistance nitro fuel Superior resistance weather Easy apply Low low cost 01/64 23 35 size Comes following colors Waco Red Polar White Insignia Blue Sun Yellow $495 PER SHEET // pk00417 ORDERING Send check money order required amount Add $395 shipping 1 6 sheets Add $749 shipping 7 12 sheets SEND TO Wing Mfg P0 Boa 33 Crystal Lake IL 60014 Illinois Residents add 6 1/20/0 sales tea Super Styro-Stick wing skin adhesive $598 16 oz Can Item #601 can does wing up 70 No eatra shipping cost ordered Tigerskins See Tigerakins Chicago Model & Hobby Show Booth 1735 SEND $350 FOR CATALOG November 1988 77 ORDERS SHIPPED DAY RECEIVED WARBIRD VIDEOS VHS OR BETA DUR 23RD YEAR R ANY TWO VIDEOS ONLY $7595 ANY 3 VIDEOS ONLY $19795 SPECIAL IMTRDD6TDRY OFFEALL IVIDEOS ONLY $19995 WARBIRD CHECKOUT VOL 1 Flying P-40 Warhawk Corsair Hellcat SB2-A Buccanneer Avenger NF 1325 Programs2 Hr Only $3995 WARBIRD CHECKOUT VOL II Flying P-38 Mitchell Bomber P-61 Black Widow Invader NF 1454 Programsi 00 Mm Only $3995 WARBIRD CHECKOUT VOL III Flying P-Si Mustang A-20 Bomber P-39 Introduction P-39 Advanced NF 1514 Programslb Mm Only $3995 CALL TOLL FREE CREDIT CARDS Li J Day Night California outside USA 213 827-8666 Shi pin Paid Continental US-Foreign add $500 0 California residents add 6 1/2% tax NFVIDEQ LIBRARY 2554 LINCOLN BLVD #568 MARINA DEL REY CA 90291 PRECISION MODEL PRODUCTS ZZ7jjJosM Made U S BARSTOCK ALUMINUM SPINNERS Part NoSize TT-150-B .1-112 TT-175-B .1-314 TT-200-B 11-225-B 14 11-226-B 2114 FAt . TT-250-B .. 2-1/2 11-251-B . 2-1/2FAI .. 11-275-B 3/4 11-276-B 314 FAt .. 11-300-B 11-301-BFAI 11-325-B .. 3-1/4 . TI-350-B . 2 TT-375-B . 3-3/4 . TT-400-B 4 RetailApprox PriceWeight $1395058 02 149509502 1595180oz 169516002 189515002 189519002 209517002 229522002 249520002 2695260oz 289525002 369534002 499547002 5995520oz 699557002 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available Sizes Add $300 Per Spinner PROP NUT ADAPTORS Part No Size 11-140A . 1/4-28 T1-147A -28/7mm 11-610-A 6 x 10mm 11-710-A 10mm 11-516-A 5/16-24 11-518-A 5/16-24/8mm 11-810-A 8 x 10mm 11-825-A 8 x 125mm 11-375-A 3/8-24 11-125-A lOx 125mm Approx Weight 061 oz 061 oz 063 oz 0 82 oz 076 oz 076oz 076 oz 075 oz 117 oz 115 oz 3 Pieces Nut Washer Machined Bushing Add $350 Shipping Handling Prices subject change notice ROMCO MFG INC OX 836 SOUTH HOUSTON TEXAS 77587 713 943-1867 square-tip prop dummy nose same weight glide tested times bleachers local Indoor site square-tip prop consist ently showed approximately 15% longer en durance other types probably due its higher pitch lower blade area higher pitch has also appeared help climb reducing initial difficult-tomanage acceleration increasing length prop run small degree havent discovered method accurately determining prop gave P-30 higher climb prop nose block assembled standard way freewheel notch prop will work better last longer short outer end shaft bent first about 950 small bend radius pos sible Assemble bend hooked part last Assembly first five Sparrow Hawks lost thermals though conven tional pop-up-tail dethermalizer acti vated Two disappeared straight up taught us very light wing loading P-30 requires something reliable standard DT method have used last five ships variation system first used Ken Wer nicke locally may have invented George Xenakis works like DT fuse like Pecks 3/10-in-diameter lightweight fuse burns through #32 rubberband wing [ hold-down wing pops off re tained 12-lb-test monofilament fish ing line attached wing tip swivel tail end fuselage freewheel prop spinning wing re strain model during fall Using system Sparrow Hawk has never failed break out strongest thermal yet model has landed con crete runways prop nose breaking slight drawback method can difficult extricate model tree fishing line wrapped around branches solution simply cut line carry extra sup ply Dont try tie fishing line short piece Y16-diameter aluminum tubing squeezed pliers both easier adjust reliable short piece head end straight pin protrudes top wing centerline assemble wing body fishing line pulled tight tail over stab around pin out wing tip Monofilament line has sufficient stretch stay taut its proper length wing hold-down rub berband goes over line hold place during flight wing place check square body centerline Glue four keys made split halves 1A-in dowel onto wing will serve guides ensure accurate positioning reattaching wing Continued page 175 @cMlPL 8b 78 Model Aviation Retail Price S495 495 495 495 495 495 495 495 595 595 t1C IN SPIHHJ11 WELL---- YR GOT THE PLANE IN BUT WHERE ARE WE GONNR 0 -v /0 lizer braces 2/ x -in softwing TEs 1 x 1 x 4-in soft blocknose & tail blocks Other Wood l%2 x x 19-in hardwood stripflap & eleva tor joiners plywood approx 1 x 7 firewall landing gear bulkhead bellcrank mount 1A x x 13-in hardwoodmotor mounts Other Materials Plans Building board Straight pins Wax paper 1Cox Tee Dee 049 051 engine 1propeller 6 x 4 Cox plastic Top Flite Zinger wood 11-in plastic spinner Ace RC Inc 1-oz wedge fuel tank Perfect #20 /s x 4-in brats tubingtank vent extension leadout guides 2 small plastic flexible fuel line /16 x 28-in music wtrepushrods landing gear 032 x 4-in music wiretailskid 12-in bellcrank mounting hardware Perfect comparable 36-in length braided lead-out line Perfect com parable 1 pairflying wire clips Perfect Du-Bro com parable 1 pair1%-in-dia plastic wheels Sig comparable 1 pair/s-in wheel collars Perfect Du-Bro comparable 42-56 x -in engine mounting bolts locknuts 2small control horns Perfect comparable flaps elevator 4wire pushrod keepers /6-in-dia music wire 48% x -in similar size fabric control surface hinges Aliphatic resin glue Franklin Tite Bond compar able Five-minute epoxy glue Duro comparable Garnet paper 100- 200-grit Norton compa rable Wet-or-dry paper 400-grit 3M comparable 1 sheetlightweight silkspan Fuel-proof dopeSig clear sanding sealer Diana Cream Stearman Red comparable 1-in numerals AMA license number 1 set012-inx 35-ft braided steel flying wire Sul livan comparable 1A control handle Sullivan comparable Cox Super Power Glow Fuel above parts materials should available local hobby shop Theres word some streets supplies Con trol Line models arent available anymore weve found true able secure everything needed build Lil Bit other models Johnny Clemens Hobby Counter Dallas know other shops stock order Control Line supplies So dont accept Geewe cant get anymore cause its just true Control Line alive Sparrow Hawk/ODwyer Continued page 78 Sparrow Hawk flies best four strands 3/6-in rubber Ten grams FM Champion rubber will 78 80 long Wash off powder coats rubber soapy water Use following method tying rubber will never slip Tie single overhand knot close end possible Laying two ends adja cent other tie another overhand knot two strands Use liberal amounts Continued page 178 Finest Kits Youll Ever Buy Build TraIn-Air 20 Train-Air 40 Sport-Air 40 Bel-AIr 40 40 Hydro-Floats rsa eesy handling uperior serobetic modern looking sport exhibition biplane has filled 55, 6 75 lbs 148 185 207-4901M1 Wise & Uastereeu4ed 1 KIT FEATURES Polyester fiberglass fusalage cowling retractable landing 92 wingspan gear Foam cores wing stab Available major production variations F4F-3 -3A -4 FM-i FM-2 Semi-Kit Fusalage cowling foam cores wing stab canopy retractable landing gear plans$27500 Complete Kit Everything listed semi-kit plus wood parts hardware necessary complete kit including 1/64 plywood sheeting wings$45000 Deluxe Kit Complete kit fusalage preassembled $85000 wings stab presheeted control surfaces prebuilt Information Package $100 VISA/MasterCard accepted add $1500 sh pp ng daho es add 5% Sa es tax Classic Glass PO Box 503 Blackfoot Idaho 83221-0503 Mike Zamber 208 785-2309 November 1988 175 fine tine kits ate machine cut sasist building reel show 80 has fully summetricel wing sections gives gresteat potential serobstic er upflght Inverted ship cspsble very slow close-In type flight right up robatic schedule can muster Classic Glass Grumman Wildcat B limEd ATIIE BEST IN ELECTRIC FLIGHT SPECIALIZING IH ASTRO FLIBHT SYSTEM -ENflI 111 ___________________________________________________ 1 I -RRl i 5l 1j CS Flight SgsteNs 31 Perrj Street Hiddlebero M 023483117 Phone 617947-2905 6 9 P H Go . Fredy Glow PIL 15 volt saliva lubricate knot pulled very tight small knots acting limit stops Cut off excess Coat rubber good grade rub ber lube install body tube push stick adequate length rear rubber support tube retained small rubberband shown photo Put two small rubberbands front end body tube behind little trian gles bands serves backnp difficult replace mo tor wound Cut short piece DT fuse slide snuffer tube use pair tweezers hold back wing mount rubberband sure positioned designed modernDealer hnuerle ported engines Dealer Inquiries Invited S Part Cam*ea% Auos 9w against fuse once latter place against snuffer tube Check center-of-gravity prop installed should balance rear spar bot tom surface wing off either direction little lead tape needed light end course out-of-balance situation can avoided entirely waiting until time glue pylon onto body Check Sparrow Hawk over warps wing tail steam out neces sary plan use model competi tion put AMA number right panel name address some plane Im usually eager go fly write AMA number black marking pen use mail address stickers name Since lost P-30s have returned maybe should also mention reward address label Flying Wait calm day test fly Before flying session lubricate prop shaft thin oil such sewing machine oil type comes neat pen cil dispenser fits nicely toolbox Test glide shim trim rear stab support until obtain slowest possi ble glide stalling Using winder put about 200 turns motor use various holes notches flagged safety pin see pho tos obvious Light DT fuse another piece fuse Never use match cigarette lighter light fuse air plane nitrate dope tissue al explosive WILLIAMS ACCESSORIES BROTHERS 4 PILOTS STANDARD TSMAN 0 RACING TAR VINTAGE TH CONTOUR BALLOON EN AGE 178 Model Aviation 10 Sparrow Hawk/ODwyer Continued page 175 HI-TECH ENCODER microprocessor based encoder board designed replace encoder board Futaba Conquest Ace Silver Seven transmitters compatible other AM FM radios market FEATURES complete calibration system use trimpots stores calibration constants four aircraft maintained during power off can mix first five channels other first five channels variety configoratiom exponential trim five strengtlss mixing expo trim can turned off during flight contrul trun throttle cntoff dual-rates servo reversing outputs four eight channels POWER REQUIREMENTS 32ma @ 96vdc SIZE 3 x45 x 75 inches SEND $400 installation operation manual oaly $17500 completely assembled tested encoder installation operation manual Please stare transmitter nwdel number channels Add $500 shipping handling EMULATION ELECTRONICS 2206 S Lynn Urbana 1L61801 217-344-8740or217-4697647 PARABELLUM 1975 July first issue 1976 197701982 197801983 1979-9-4-9641980-9--4-9&5198101986 i0 0 0 i0 Enclose separate $2200 check set ordered NO CASH NO CHARGES I I I I I r Print carefully shipping label II II Name II Street Addresa HStateZIP II Make checks payable AMA Send orders Academy Model Aeronautics 1810 Samuel Morse Dr Reston VA 22090 Linrnrn. urn urn ml Launch model positioning slightly nose up little left wind thrust line angles adequate model should gently climb right spiral about 10 seconds glide large left circle use short DT fuse forewarned Sparrow Hawk could startle disassembling itself air coming straight down plane does climb 200 turns flies much faster glide speed downthrust should reduced flight speed slow theres no climb try find some peppier rubber speed up right turn tight very lit tle climb reduce right thrust try again 200 turns Always use DT fuse simplest test flight things look good gradually increase number turns 650 700 about 500 turns will encounter so-called knee-in-the-torque curve sharply rapid rise potential power output Its zone Scale sport fliers tend give up win contest have keep trimming model zooms near-vertical 50 ft drops off right center-of-gravity should moved aft elevator angle reduced correct glide Dont change thrust line plane flew well 200 turns entire books have written adjusting Free Flight models theres still no substitute lot practice litfie experimenting own great deal can learned small model like P-30 anxiety worry associ ated flying bigger expensive After crashing P-30 wouldnt such big deal hold back optimal glide remember freewheel prop way out front de stabilizing influence functions gyro Therefore slower glide less effect prop will have Ill see next contest bring Sparrow Hawk well both have win ners Good luck Reno/Berliner Continued page 92 next year 1973 saw quite few rec ords overturned Lyle Shelton Wright R-3350-powered Bearcat turned time trials record 427 mph finals record 428 mph Formula Falck set qualifier record 235 mph Cote won finals 231 mph Among small field Sport Biplanes new all-metal Sundancer flown Sid White recordsetting 194 mph time trials 195 mph finals AT-6 time trials winner Jim Mott 211 mph Bill Turnbull took finals 207 mph 1974 Lyle Shelton came through another time trials record 432 mph Un limited bowed Ken Burnstine 382 mph finals hot ones dropped out Formula Ray Cote also scored record speeds 240 mph Name Street Address city State Zip HOBg RNATIONAL iNc November 1988 179 Modelers aioice High Quality Convenient Size Modest Price Jr Kwik Set Epoxy 5 OL $695 Gas Model Products 8773 Russet Dr Cincinnati OH 45239 dealer call 513-385-7398 order direct add *1 50 postage AMA INATONAII CENTENFOR Collectors Notice Just released AMA Museum BACK ISSUES Model Aviation magazinesNEW original car tons sale YEAR SETS ONLY Check selections below send SEPARATE $2200 CHECK individual set Orders will filled first-come basis set request sold out check will returned being cashed Limited Quantities Sets Are Complete L VIA
Edition: Model Aviation - 1988/11
Page Numbers: 72, 73, 74, 75, 76, 77, 78, 175, 178, 179
Hawk P-30 class has become popular cate gories out door Free Flight modeling can join ranks design thats proven winner John ODwyer WHY YOU ASK another P-30 swer should dear competitors heart P-30 lives up hopes designed really winand win does Sparrow Hawk definitely outper forms breed has placed con test its competed yet airplane maintains relative simplicity belies its capabilities As retired aeronautical engineer relative newcomer Free Flight modeling looking challenging event start off After reading rules roughed out first P-30 built flew itor tried Heavy ugly model barely got airborne Clearly better way decided use some experience education design betterperforming P-30 point lets review AMA rules P-30 40-gram minimum weight probably important consideration 30-in maximum dimension no long skinny efficient high aspect ratio wings 10 grams rubber use effectively freewheel plastic prop between 905 984 in diameter Are plastic props alike Other challenges became apparent de velopment progressed will cov ered later thing 40 years experience de signing full-scale aircraft will make totally obvious excess weight invariably primary reason poor performance Hence want competitive model keeping weight down should number consideration achieve need scale Any scale such pos tal scale weight watchers scale will Best though good threebeam laboratory scale calibrated grams 72 Model Aviation Sparrow Above A lot research went making simple-looking airplane consistent contest winner has become Fortunately hard work has already done re mains construct per plans instructions article Below author young friend Sean Bridges wind up again another trip Texas skies Thus equipped can weigh several piec es balsawood pick lightestor discover two apparenfly identical plas tic props actually differ weight two grams Also scale allows check youre flying maximum legal weight rubber arent shortchang ing yourself have simple postal scale calibrated ounces ounce equals 2834 grams 1 oz little 40 grams /4 oz slightly less 10 grams Since wingspan limited 30 low aspect ratio low wing loading seem best An aspect ratio betwecn 61 71 indicated lower limit several rea sons including rapid rise induced drag structural stability wingspan being compromise can least compensate using best possible air foil Airfoil requirements small slow Left When fastening monofilament line swivel use piece aluminum tubing crimped over lines end instead trying tie knot will inevitably sup out Right other end monofilament line permanently attached models left wing tip November 1988 73 balsa sheet trimmed shape before its formed around broom handle make body tube four pieces right glued together make wing mounting pylon aft end bulkhead mini swivel Once wing pops off its pylon dethermaliz ing remains connected fuselage piece monofilament line tied swivel pylon glued body tube CyA Placed shown acts partial exter nal bulkhead strengthening bodys center Cut out middle pylon save weight rear edge pylon notched cen ter snuffer tube Dark band around tube 24-hr epoxy Use sparingly its heavy plane like differ greatly what full-size aircraft need airfoils spe cifically designed low-speed regime considered Much has written subject Among authoritative works published Dieter Althaus based studies low-speed tunnel Stuttgart Germany Using P-30 model flight speed 8 10 ft per sec mea sured test gliding bleachers local gym best airfoil size speed appeared Sokolov Russian Glider section exhibited very good lift/drag ratio 601 tar bulator Lift/drag ratio best index gliding efficiency Sokolov mea sured nearly 80% higher easy-touse flat-bottomed Clark Y airfoil shape author lost first five Sparrow Hawks usual pop-up stab OTing failed bring back down Popping wing off way almost always gets model out thermal brings safely back down Left A common straight pin holds DT line place wing center rubberband secured Once band place lift line over pinhead rubberband will hold place against sandpaper Right band wrapped around fuselage strengthen area rear motor peg small rubberband keeps hollow peg place after tension rubber motor gone Lett The two side notcnes nob inc satety pin piace wouna moipr untii prop can installed safety pin piaced inc nose block prevent prop turning nose plug holding bands other backup hooked DT fuse lit 74 Model Aviation DT line runs along upper surface wing under hold-down rubberband back along left side fin over stab swivel end body tube Full-Size Plans Available Page 186 Fuselage first rolled tube fu selage building can kind fun begin selecting correct wood ex tremely important Whats required very straight-grained 3 x 36 x sheet medium-lightweight balsa Sig has good balsa have also found Mid west balsa carried local hobby shop very even-grained light /32 sheet thin enough can held up light check uniformity grain Reject sheets dark streaks indi cate harder-grained wood may crack rolled 3-in-wide sheet 1/3 thickness will make tube roughly 1 in diameter Thats bigger wound P-30 motor can save weight using smaller dia meter Trim /16 edge sheet along its full length cut off end length 281/2 Again save weight taper rear half %-in diame ter Referring photo prepared sheet cut two % x 14-in triangles part flat sheet will become tail end Apply two coats undiluted dope inside surface fuselage allowing about two hours drying between coats will seal inside against rubber lu bricant add strength cause tube curl like magic wet Locate broom handle something comparable % in diameter will serve mandrel body tube formed After dope thoroughly dry curl tube soaking balsa hot water bathtub about 10 min utes couple wet washcloths will hold balsa underwater soaks Place sheet broom handle wrap Ace bandage gauze strips some stretchable cloth will al Continued page 76 0 2 L aft 00 O S 2 / 012 / NH] 21 4 II ft -JK S 00 21 t0 S H 7 Li 7 E B 21 hft aa 20 Ca ft 50T ft 6 00 N 0 ft 0 L i1 K 02F 2 K4z November 1988 75 5 id 00 4 lx 4 LI Four keys black areas made two pieces dowel have split halves keys place accurate wing location pylon assured time 12 2- B aI 21Ja 2 L5kK j~ low wet tube diy handle dow el should large enough straight edges tube quite touch course tapered edges farther apart never fear will deal topic later Carefully set whole thing aside allow dry about 24 hours Cut 7-in piece off end sheet cut cross grain four equal pieces shown photo glued together edges using cyano acrylate CyA make 1% x 12-in strip will formed wing mount py lon Among CyAs Ive best luck Goldbergs Super Jet mediumviscosity fast-setting glue Make wing mount pylon using two symmetrical airfoils shown plans way make accurate copy obtain good dark Xerox copy full-size drawing Lay Xerox copy face down appropriate balsa sheet using dry flatiron MonoKote iron press down backside neatly transfer image balsa twice have two ribs Glue two ribs gether small spar-like rectangles shown Roughiy center subassembly 12-in-long A2 sheet equal amounts above below glue nose Working gradually attach side around trailing edge using CyA cut off excess rear Rough shape upper lower surfaces leave plenty material sanding time basic fuselage tube should dry Remove bandage slide mandrel straight sec tion tube can easily squeezed gether carefully secured CyA Once straight portion glued aft taper can closed Always keeping weight savings mind take care use too much CyA / ply bands shown drawing added both inside outside nose latter being rear rubber post two bands made -in-wide strips /-in-thick plywood about 3 long Make sure outside grain running direction /2-in strips Soak bands hot water wrap around mandrel used main body tube Hold plywood bands place rubberbands until dry adhere CyA Shape pylon mounting body tube sanding 180-grit paper wrapped around either mandrel fu selage body itself Attach aluminum snuffer tube angle shown using slowdrying metal bond epoxy Since epoxy very heavy sure use enough form narrow band around tube Sand both fuselage body tube pylon smooth surface reduce weight ribs pylon may cut out somewhat reduce weight further Locate glue pylon 6% 7 nose body important seam tube positioned bottom centerline before pylon attached Cut out disc / plywood making diameter aft end body tube Drill /l6 hole center insert through end small fishing swiv el short piece pin will prevent its re moval Secure swivel clear fiveminute epoxy Glue disc shown aft end fuselage body tube rein forcing couple small strips silk nylon single wrap h-in-wide silk fiveminute epoxy will strengthen front end well After epoxy has set up front cut three hes forward edge purpose upper po sition nose plug two side notches keep winding safety pin turning during transition winding motor installing prop fm made directly separate plan view facing right since cambered left turn flat left side Before begin make Xerox copies fin tail ribs use pat terns transferring wood use flat piece ceiling panel material work surface making wings tails first spray light coat Scotch spray adhesive board stick sec tion appropriate plan board spray plan section light coat same adhesive Caution sure keep spray light Cover plan section sheet wax paper latter works much better anything have tried cement super glue epoxy will stick damage plan Afterwards wax paper peels off plan leaving slightly sticky day Once youve made fin sand lightly paint outer edges coat Aero Gloss Balsa Sanding Sealer Cut Japanese tissue following grain longest dimension fin Coat struc ture thick dope lay tissue stretching out wrinldes problem areas dampen lit tle thinner trailing edge fin intended long enough extend through body tube add strength attachment Line up fin vertical wing pylon flat side fin should par allel body centerline stabilizer rest glued body tube left side about degree high aid left turn glide Water shrink fin tissue brush coat very thin nitrate dope Finish painting two coats thin sanding sealer waterproof outside body tube pylon sanding lightly between coats Wing fairly standard construction techaiques followed few suggestions order Iron Xerox copy main wing rib piece A2 plywood white painted aluminum carefully cut file shape Use template cut out ribs Stack balsa ribs us ing two pieces scrap /6-sq balsa 76 Model Aviation ii 0 m 0 K I 1 0 -I ii 0 z z 0 I0 C C n 0 z 0 z C, 0 -u 0 -a m I m 0 Q C -I CD C, C 0 C, 1 0 U 0 0 01 0 LzU N 0 C S S. S. CA S. CA x oo x x oo mini 01 x oo x S. x U spar grooves Sand stack ribs uniform contour length Pin down trailing edge waxpaper-covered plan using some scrap piec es wood block up forward edge /32 46-sq rib jig strip located about ard trailing edge preparation assures accurate undercamber extremely important low-speed airfoil triangular dihedral checker used assure center ribs set proper angle prior gluing place completed half removed plans propped up correct dihedral gle glued together quite bit Super Jet CyA rather steep V di hedral V saves about 1 grams weight over polyhedral configuration Cover Japanese tissue grain running spanwise turbulator made model railroading HO gauge scale 2 x 4s wing finished free warps washin washout makes much easier check prior flying ses sion generous amount dihedral correct pylon height will lessen need intentional wing warps Stabilizer Construction straightforward Use lightweight wood can get away coat dope Ft Worth TX coat does job live near water may have use two coats Just keep light possible Note liffle notch trailing edge center mates short peg 1/16 dowel added point rear end body help keep stab line bottom peg also keeps stab hold-down rubber body pre vents interfering dethermal izer DT swivel Propeller assembly Only few plas tic props available suitable P-30 models common Japanese rounded-tip type come green blue silver-gray doesnt seem verifiable difference among some people claim silver ones better propellers 9%-in di ameter 7-in pitch weigh 68 71 grams Another prop style now imported Europe type has square tip has same 9%-in diameter rounded-tip type has 9-in nominal pitch weighs seven grams As far know props available yellow FAT Model Supply carries facsimile prop however gram heavier original fre quently out balance AMA rules illegal shave sand P-30 prop lighten balance comparative evaluation per formance type propeller three different nose block assemblies con structedone round-tip prop Continued page 78 IWiVG MFG Tigerskini4 WHAT DO YOU CALL THE BEST SHEETING MATERIAL FOR FOAM WING CORES Wing Mfg pioneered foam core wing construction early 60s have used everything tangowood 002 stainless steel sheeting last few years have using pressure laminates evolved R & 0 work Uncle Sam Tigurskins pre-finish high density posterboard material clear laminated plastic film top simply apply contact cement such Styro-Stick adhesive cores sheeting press sheeting Onto cores material pliable can easily wrap around leading edges Tigerskins CHECK THESE FEATURES Superior strength weight ratio Superior bond capability foam 001 per sq temperature stability Smooth high gloss finish Superior resistance nitro fuel Superior resistance weather Easy apply Low low cost 01/64 23 35 size Comes following colors Waco Red Polar White Insignia Blue Sun Yellow $495 PER SHEET // pk00417 ORDERING Send check money order required amount Add $395 shipping 1 6 sheets Add $749 shipping 7 12 sheets SEND TO Wing Mfg P0 Boa 33 Crystal Lake IL 60014 Illinois Residents add 6 1/20/0 sales tea Super Styro-Stick wing skin adhesive $598 16 oz Can Item #601 can does wing up 70 No eatra shipping cost ordered Tigerskins See Tigerakins Chicago Model & Hobby Show Booth 1735 SEND $350 FOR CATALOG November 1988 77 ORDERS SHIPPED DAY RECEIVED WARBIRD VIDEOS VHS OR BETA DUR 23RD YEAR R ANY TWO VIDEOS ONLY $7595 ANY 3 VIDEOS ONLY $19795 SPECIAL IMTRDD6TDRY OFFEALL IVIDEOS ONLY $19995 WARBIRD CHECKOUT VOL 1 Flying P-40 Warhawk Corsair Hellcat SB2-A Buccanneer Avenger NF 1325 Programs2 Hr Only $3995 WARBIRD CHECKOUT VOL II Flying P-38 Mitchell Bomber P-61 Black Widow Invader NF 1454 Programsi 00 Mm Only $3995 WARBIRD CHECKOUT VOL III Flying P-Si Mustang A-20 Bomber P-39 Introduction P-39 Advanced NF 1514 Programslb Mm Only $3995 CALL TOLL FREE CREDIT CARDS Li J Day Night California outside USA 213 827-8666 Shi pin Paid Continental US-Foreign add $500 0 California residents add 6 1/2% tax NFVIDEQ LIBRARY 2554 LINCOLN BLVD #568 MARINA DEL REY CA 90291 PRECISION MODEL PRODUCTS ZZ7jjJosM Made U S BARSTOCK ALUMINUM SPINNERS Part NoSize TT-150-B .1-112 TT-175-B .1-314 TT-200-B 11-225-B 14 11-226-B 2114 FAt . TT-250-B .. 2-1/2 11-251-B . 2-1/2FAI .. 11-275-B 3/4 11-276-B 314 FAt .. 11-300-B 11-301-BFAI 11-325-B .. 3-1/4 . TI-350-B . 2 TT-375-B . 3-3/4 . TT-400-B 4 RetailApprox PriceWeight $1395058 02 149509502 1595180oz 169516002 189515002 189519002 209517002 229522002 249520002 2695260oz 289525002 369534002 499547002 5995520oz 699557002 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available Sizes Add $300 Per Spinner PROP NUT ADAPTORS Part No Size 11-140A . 1/4-28 T1-147A -28/7mm 11-610-A 6 x 10mm 11-710-A 10mm 11-516-A 5/16-24 11-518-A 5/16-24/8mm 11-810-A 8 x 10mm 11-825-A 8 x 125mm 11-375-A 3/8-24 11-125-A lOx 125mm Approx Weight 061 oz 061 oz 063 oz 0 82 oz 076 oz 076oz 076 oz 075 oz 117 oz 115 oz 3 Pieces Nut Washer Machined Bushing Add $350 Shipping Handling Prices subject change notice ROMCO MFG INC OX 836 SOUTH HOUSTON TEXAS 77587 713 943-1867 square-tip prop dummy nose same weight glide tested times bleachers local Indoor site square-tip prop consist ently showed approximately 15% longer en durance other types probably due its higher pitch lower blade area higher pitch has also appeared help climb reducing initial difficult-tomanage acceleration increasing length prop run small degree havent discovered method accurately determining prop gave P-30 higher climb prop nose block assembled standard way freewheel notch prop will work better last longer short outer end shaft bent first about 950 small bend radius pos sible Assemble bend hooked part last Assembly first five Sparrow Hawks lost thermals though conven tional pop-up-tail dethermalizer acti vated Two disappeared straight up taught us very light wing loading P-30 requires something reliable standard DT method have used last five ships variation system first used Ken Wer nicke locally may have invented George Xenakis works like DT fuse like Pecks 3/10-in-diameter lightweight fuse burns through #32 rubberband wing [ hold-down wing pops off re tained 12-lb-test monofilament fish ing line attached wing tip swivel tail end fuselage freewheel prop spinning wing re strain model during fall Using system Sparrow Hawk has never failed break out strongest thermal yet model has landed con crete runways prop nose breaking slight drawback method can difficult extricate model tree fishing line wrapped around branches solution simply cut line carry extra sup ply Dont try tie fishing line short piece Y16-diameter aluminum tubing squeezed pliers both easier adjust reliable short piece head end straight pin protrudes top wing centerline assemble wing body fishing line pulled tight tail over stab around pin out wing tip Monofilament line has sufficient stretch stay taut its proper length wing hold-down rub berband goes over line hold place during flight wing place check square body centerline Glue four keys made split halves 1A-in dowel onto wing will serve guides ensure accurate positioning reattaching wing Continued page 175 @cMlPL 8b 78 Model Aviation Retail Price S495 495 495 495 495 495 495 495 595 595 t1C IN SPIHHJ11 WELL---- YR GOT THE PLANE IN BUT WHERE ARE WE GONNR 0 -v /0 lizer braces 2/ x -in softwing TEs 1 x 1 x 4-in soft blocknose & tail blocks Other Wood l%2 x x 19-in hardwood stripflap & eleva tor joiners plywood approx 1 x 7 firewall landing gear bulkhead bellcrank mount 1A x x 13-in hardwoodmotor mounts Other Materials Plans Building board Straight pins Wax paper 1Cox Tee Dee 049 051 engine 1propeller 6 x 4 Cox plastic Top Flite Zinger wood 11-in plastic spinner Ace RC Inc 1-oz wedge fuel tank Perfect #20 /s x 4-in brats tubingtank vent extension leadout guides 2 small plastic flexible fuel line /16 x 28-in music wtrepushrods landing gear 032 x 4-in music wiretailskid 12-in bellcrank mounting hardware Perfect comparable 36-in length braided lead-out line Perfect com parable 1 pairflying wire clips Perfect Du-Bro com parable 1 pair1%-in-dia plastic wheels Sig comparable 1 pair/s-in wheel collars Perfect Du-Bro comparable 42-56 x -in engine mounting bolts locknuts 2small control horns Perfect comparable flaps elevator 4wire pushrod keepers /6-in-dia music wire 48% x -in similar size fabric control surface hinges Aliphatic resin glue Franklin Tite Bond compar able Five-minute epoxy glue Duro comparable Garnet paper 100- 200-grit Norton compa rable Wet-or-dry paper 400-grit 3M comparable 1 sheetlightweight silkspan Fuel-proof dopeSig clear sanding sealer Diana Cream Stearman Red comparable 1-in numerals AMA license number 1 set012-inx 35-ft braided steel flying wire Sul livan comparable 1A control handle Sullivan comparable Cox Super Power Glow Fuel above parts materials should available local hobby shop Theres word some streets supplies Con trol Line models arent available anymore weve found true able secure everything needed build Lil Bit other models Johnny Clemens Hobby Counter Dallas know other shops stock order Control Line supplies So dont accept Geewe cant get anymore cause its just true Control Line alive Sparrow Hawk/ODwyer Continued page 78 Sparrow Hawk flies best four strands 3/6-in rubber Ten grams FM Champion rubber will 78 80 long Wash off powder coats rubber soapy water Use following method tying rubber will never slip Tie single overhand knot close end possible Laying two ends adja cent other tie another overhand knot two strands Use liberal amounts Continued page 178 Finest Kits Youll Ever Buy Build TraIn-Air 20 Train-Air 40 Sport-Air 40 Bel-AIr 40 40 Hydro-Floats rsa eesy handling uperior serobetic modern looking sport exhibition biplane has filled 55, 6 75 lbs 148 185 207-4901M1 Wise & Uastereeu4ed 1 KIT FEATURES Polyester fiberglass fusalage cowling retractable landing 92 wingspan gear Foam cores wing stab Available major production variations F4F-3 -3A -4 FM-i FM-2 Semi-Kit Fusalage cowling foam cores wing stab canopy retractable landing gear plans$27500 Complete Kit Everything listed semi-kit plus wood parts hardware necessary complete kit including 1/64 plywood sheeting wings$45000 Deluxe Kit Complete kit fusalage preassembled $85000 wings stab presheeted control surfaces prebuilt Information Package $100 VISA/MasterCard accepted add $1500 sh pp ng daho es add 5% Sa es tax Classic Glass PO Box 503 Blackfoot Idaho 83221-0503 Mike Zamber 208 785-2309 November 1988 175 fine tine kits ate machine cut sasist building reel show 80 has fully summetricel wing sections gives gresteat potential serobstic er upflght Inverted ship cspsble very slow close-In type flight right up robatic schedule can muster Classic Glass Grumman Wildcat B limEd ATIIE BEST IN ELECTRIC FLIGHT SPECIALIZING IH ASTRO FLIBHT SYSTEM -ENflI 111 ___________________________________________________ 1 I -RRl i 5l 1j CS Flight SgsteNs 31 Perrj Street Hiddlebero M 023483117 Phone 617947-2905 6 9 P H Go . Fredy Glow PIL 15 volt saliva lubricate knot pulled very tight small knots acting limit stops Cut off excess Coat rubber good grade rub ber lube install body tube push stick adequate length rear rubber support tube retained small rubberband shown photo Put two small rubberbands front end body tube behind little trian gles bands serves backnp difficult replace mo tor wound Cut short piece DT fuse slide snuffer tube use pair tweezers hold back wing mount rubberband sure positioned designed modernDealer hnuerle ported engines Dealer Inquiries Invited S Part Cam*ea% Auos 9w against fuse once latter place against snuffer tube Check center-of-gravity prop installed should balance rear spar bot tom surface wing off either direction little lead tape needed light end course out-of-balance situation can avoided entirely waiting until time glue pylon onto body Check Sparrow Hawk over warps wing tail steam out neces sary plan use model competi tion put AMA number right panel name address some plane Im usually eager go fly write AMA number black marking pen use mail address stickers name Since lost P-30s have returned maybe should also mention reward address label Flying Wait calm day test fly Before flying session lubricate prop shaft thin oil such sewing machine oil type comes neat pen cil dispenser fits nicely toolbox Test glide shim trim rear stab support until obtain slowest possi ble glide stalling Using winder put about 200 turns motor use various holes notches flagged safety pin see pho tos obvious Light DT fuse another piece fuse Never use match cigarette lighter light fuse air plane nitrate dope tissue al explosive WILLIAMS ACCESSORIES BROTHERS 4 PILOTS STANDARD TSMAN 0 RACING TAR VINTAGE TH CONTOUR BALLOON EN AGE 178 Model Aviation 10 Sparrow Hawk/ODwyer Continued page 175 HI-TECH ENCODER microprocessor based encoder board designed replace encoder board Futaba Conquest Ace Silver Seven transmitters compatible other AM FM radios market FEATURES complete calibration system use trimpots stores calibration constants four aircraft maintained during power off can mix first five channels other first five channels variety configoratiom exponential trim five strengtlss mixing expo trim can turned off during flight contrul trun throttle cntoff dual-rates servo reversing outputs four eight channels POWER REQUIREMENTS 32ma @ 96vdc SIZE 3 x45 x 75 inches SEND $400 installation operation manual oaly $17500 completely assembled tested encoder installation operation manual Please stare transmitter nwdel number channels Add $500 shipping handling EMULATION ELECTRONICS 2206 S Lynn Urbana 1L61801 217-344-8740or217-4697647 PARABELLUM 1975 July first issue 1976 197701982 197801983 1979-9-4-9641980-9--4-9&5198101986 i0 0 0 i0 Enclose separate $2200 check set ordered NO CASH NO CHARGES I I I I I r Print carefully shipping label II II Name II Street Addresa HStateZIP II Make checks payable AMA Send orders Academy Model Aeronautics 1810 Samuel Morse Dr Reston VA 22090 Linrnrn. urn urn ml Launch model positioning slightly nose up little left wind thrust line angles adequate model should gently climb right spiral about 10 seconds glide large left circle use short DT fuse forewarned Sparrow Hawk could startle disassembling itself air coming straight down plane does climb 200 turns flies much faster glide speed downthrust should reduced flight speed slow theres no climb try find some peppier rubber speed up right turn tight very lit tle climb reduce right thrust try again 200 turns Always use DT fuse simplest test flight things look good gradually increase number turns 650 700 about 500 turns will encounter so-called knee-in-the-torque curve sharply rapid rise potential power output Its zone Scale sport fliers tend give up win contest have keep trimming model zooms near-vertical 50 ft drops off right center-of-gravity should moved aft elevator angle reduced correct glide Dont change thrust line plane flew well 200 turns entire books have written adjusting Free Flight models theres still no substitute lot practice litfie experimenting own great deal can learned small model like P-30 anxiety worry associ ated flying bigger expensive After crashing P-30 wouldnt such big deal hold back optimal glide remember freewheel prop way out front de stabilizing influence functions gyro Therefore slower glide less effect prop will have Ill see next contest bring Sparrow Hawk well both have win ners Good luck Reno/Berliner Continued page 92 next year 1973 saw quite few rec ords overturned Lyle Shelton Wright R-3350-powered Bearcat turned time trials record 427 mph finals record 428 mph Formula Falck set qualifier record 235 mph Cote won finals 231 mph Among small field Sport Biplanes new all-metal Sundancer flown Sid White recordsetting 194 mph time trials 195 mph finals AT-6 time trials winner Jim Mott 211 mph Bill Turnbull took finals 207 mph 1974 Lyle Shelton came through another time trials record 432 mph Un limited bowed Ken Burnstine 382 mph finals hot ones dropped out Formula Ray Cote also scored record speeds 240 mph Name Street Address city State Zip HOBg RNATIONAL iNc November 1988 179 Modelers aioice High Quality Convenient Size Modest Price Jr Kwik Set Epoxy 5 OL $695 Gas Model Products 8773 Russet Dr Cincinnati OH 45239 dealer call 513-385-7398 order direct add *1 50 postage AMA INATONAII CENTENFOR Collectors Notice Just released AMA Museum BACK ISSUES Model Aviation magazinesNEW original car tons sale YEAR SETS ONLY Check selections below send SEPARATE $2200 CHECK individual set Orders will filled first-come basis set request sold out check will returned being cashed Limited Quantities Sets Are Complete L VIA
Edition: Model Aviation - 1988/11
Page Numbers: 72, 73, 74, 75, 76, 77, 78, 175, 178, 179
Hawk P-30 class has become popular cate gories out door Free Flight modeling can join ranks design thats proven winner John ODwyer WHY YOU ASK another P-30 swer should dear competitors heart P-30 lives up hopes designed really winand win does Sparrow Hawk definitely outper forms breed has placed con test its competed yet airplane maintains relative simplicity belies its capabilities As retired aeronautical engineer relative newcomer Free Flight modeling looking challenging event start off After reading rules roughed out first P-30 built flew itor tried Heavy ugly model barely got airborne Clearly better way decided use some experience education design betterperforming P-30 point lets review AMA rules P-30 40-gram minimum weight probably important consideration 30-in maximum dimension no long skinny efficient high aspect ratio wings 10 grams rubber use effectively freewheel plastic prop between 905 984 in diameter Are plastic props alike Other challenges became apparent de velopment progressed will cov ered later thing 40 years experience de signing full-scale aircraft will make totally obvious excess weight invariably primary reason poor performance Hence want competitive model keeping weight down should number consideration achieve need scale Any scale such pos tal scale weight watchers scale will Best though good threebeam laboratory scale calibrated grams 72 Model Aviation Sparrow Above A lot research went making simple-looking airplane consistent contest winner has become Fortunately hard work has already done re mains construct per plans instructions article Below author young friend Sean Bridges wind up again another trip Texas skies Thus equipped can weigh several piec es balsawood pick lightestor discover two apparenfly identical plas tic props actually differ weight two grams Also scale allows check youre flying maximum legal weight rubber arent shortchang ing yourself have simple postal scale calibrated ounces ounce equals 2834 grams 1 oz little 40 grams /4 oz slightly less 10 grams Since wingspan limited 30 low aspect ratio low wing loading seem best An aspect ratio betwecn 61 71 indicated lower limit several rea sons including rapid rise induced drag structural stability wingspan being compromise can least compensate using best possible air foil Airfoil requirements small slow Left When fastening monofilament line swivel use piece aluminum tubing crimped over lines end instead trying tie knot will inevitably sup out Right other end monofilament line permanently attached models left wing tip November 1988 73 balsa sheet trimmed shape before its formed around broom handle make body tube four pieces right glued together make wing mounting pylon aft end bulkhead mini swivel Once wing pops off its pylon dethermaliz ing remains connected fuselage piece monofilament line tied swivel pylon glued body tube CyA Placed shown acts partial exter nal bulkhead strengthening bodys center Cut out middle pylon save weight rear edge pylon notched cen ter snuffer tube Dark band around tube 24-hr epoxy Use sparingly its heavy plane like differ greatly what full-size aircraft need airfoils spe cifically designed low-speed regime considered Much has written subject Among authoritative works published Dieter Althaus based studies low-speed tunnel Stuttgart Germany Using P-30 model flight speed 8 10 ft per sec mea sured test gliding bleachers local gym best airfoil size speed appeared Sokolov Russian Glider section exhibited very good lift/drag ratio 601 tar bulator Lift/drag ratio best index gliding efficiency Sokolov mea sured nearly 80% higher easy-touse flat-bottomed Clark Y airfoil shape author lost first five Sparrow Hawks usual pop-up stab OTing failed bring back down Popping wing off way almost always gets model out thermal brings safely back down Left A common straight pin holds DT line place wing center rubberband secured Once band place lift line over pinhead rubberband will hold place against sandpaper Right band wrapped around fuselage strengthen area rear motor peg small rubberband keeps hollow peg place after tension rubber motor gone Lett The two side notcnes nob inc satety pin piace wouna moipr untii prop can installed safety pin piaced inc nose block prevent prop turning nose plug holding bands other backup hooked DT fuse lit 74 Model Aviation DT line runs along upper surface wing under hold-down rubberband back along left side fin over stab swivel end body tube Full-Size Plans Available Page 186 Fuselage first rolled tube fu selage building can kind fun begin selecting correct wood ex tremely important Whats required very straight-grained 3 x 36 x sheet medium-lightweight balsa Sig has good balsa have also found Mid west balsa carried local hobby shop very even-grained light /32 sheet thin enough can held up light check uniformity grain Reject sheets dark streaks indi cate harder-grained wood may crack rolled 3-in-wide sheet 1/3 thickness will make tube roughly 1 in diameter Thats bigger wound P-30 motor can save weight using smaller dia meter Trim /16 edge sheet along its full length cut off end length 281/2 Again save weight taper rear half %-in diame ter Referring photo prepared sheet cut two % x 14-in triangles part flat sheet will become tail end Apply two coats undiluted dope inside surface fuselage allowing about two hours drying between coats will seal inside against rubber lu bricant add strength cause tube curl like magic wet Locate broom handle something comparable % in diameter will serve mandrel body tube formed After dope thoroughly dry curl tube soaking balsa hot water bathtub about 10 min utes couple wet washcloths will hold balsa underwater soaks Place sheet broom handle wrap Ace bandage gauze strips some stretchable cloth will al Continued page 76 0 2 L aft 00 O S 2 / 012 / NH] 21 4 II ft -JK S 00 21 t0 S H 7 Li 7 E B 21 hft aa 20 Ca ft 50T ft 6 00 N 0 ft 0 L i1 K 02F 2 K4z November 1988 75 5 id 00 4 lx 4 LI Four keys black areas made two pieces dowel have split halves keys place accurate wing location pylon assured time 12 2- B aI 21Ja 2 L5kK j~ low wet tube diy handle dow el should large enough straight edges tube quite touch course tapered edges farther apart never fear will deal topic later Carefully set whole thing aside allow dry about 24 hours Cut 7-in piece off end sheet cut cross grain four equal pieces shown photo glued together edges using cyano acrylate CyA make 1% x 12-in strip will formed wing mount py lon Among CyAs Ive best luck Goldbergs Super Jet mediumviscosity fast-setting glue Make wing mount pylon using two symmetrical airfoils shown plans way make accurate copy obtain good dark Xerox copy full-size drawing Lay Xerox copy face down appropriate balsa sheet using dry flatiron MonoKote iron press down backside neatly transfer image balsa twice have two ribs Glue two ribs gether small spar-like rectangles shown Roughiy center subassembly 12-in-long A2 sheet equal amounts above below glue nose Working gradually attach side around trailing edge using CyA cut off excess rear Rough shape upper lower surfaces leave plenty material sanding time basic fuselage tube should dry Remove bandage slide mandrel straight sec tion tube can easily squeezed gether carefully secured CyA Once straight portion glued aft taper can closed Always keeping weight savings mind take care use too much CyA / ply bands shown drawing added both inside outside nose latter being rear rubber post two bands made -in-wide strips /-in-thick plywood about 3 long Make sure outside grain running direction /2-in strips Soak bands hot water wrap around mandrel used main body tube Hold plywood bands place rubberbands until dry adhere CyA Shape pylon mounting body tube sanding 180-grit paper wrapped around either mandrel fu selage body itself Attach aluminum snuffer tube angle shown using slowdrying metal bond epoxy Since epoxy very heavy sure use enough form narrow band around tube Sand both fuselage body tube pylon smooth surface reduce weight ribs pylon may cut out somewhat reduce weight further Locate glue pylon 6% 7 nose body important seam tube positioned bottom centerline before pylon attached Cut out disc / plywood making diameter aft end body tube Drill /l6 hole center insert through end small fishing swiv el short piece pin will prevent its re moval Secure swivel clear fiveminute epoxy Glue disc shown aft end fuselage body tube rein forcing couple small strips silk nylon single wrap h-in-wide silk fiveminute epoxy will strengthen front end well After epoxy has set up front cut three hes forward edge purpose upper po sition nose plug two side notches keep winding safety pin turning during transition winding motor installing prop fm made directly separate plan view facing right since cambered left turn flat left side Before begin make Xerox copies fin tail ribs use pat terns transferring wood use flat piece ceiling panel material work surface making wings tails first spray light coat Scotch spray adhesive board stick sec tion appropriate plan board spray plan section light coat same adhesive Caution sure keep spray light Cover plan section sheet wax paper latter works much better anything have tried cement super glue epoxy will stick damage plan Afterwards wax paper peels off plan leaving slightly sticky day Once youve made fin sand lightly paint outer edges coat Aero Gloss Balsa Sanding Sealer Cut Japanese tissue following grain longest dimension fin Coat struc ture thick dope lay tissue stretching out wrinldes problem areas dampen lit tle thinner trailing edge fin intended long enough extend through body tube add strength attachment Line up fin vertical wing pylon flat side fin should par allel body centerline stabilizer rest glued body tube left side about degree high aid left turn glide Water shrink fin tissue brush coat very thin nitrate dope Finish painting two coats thin sanding sealer waterproof outside body tube pylon sanding lightly between coats Wing fairly standard construction techaiques followed few suggestions order Iron Xerox copy main wing rib piece A2 plywood white painted aluminum carefully cut file shape Use template cut out ribs Stack balsa ribs us ing two pieces scrap /6-sq balsa 76 Model Aviation ii 0 m 0 K I 1 0 -I ii 0 z z 0 I0 C C n 0 z 0 z C, 0 -u 0 -a m I m 0 Q C -I CD C, C 0 C, 1 0 U 0 0 01 0 LzU N 0 C S S. S. CA S. CA x oo x x oo mini 01 x oo x S. x U spar grooves Sand stack ribs uniform contour length Pin down trailing edge waxpaper-covered plan using some scrap piec es wood block up forward edge /32 46-sq rib jig strip located about ard trailing edge preparation assures accurate undercamber extremely important low-speed airfoil triangular dihedral checker used assure center ribs set proper angle prior gluing place completed half removed plans propped up correct dihedral gle glued together quite bit Super Jet CyA rather steep V di hedral V saves about 1 grams weight over polyhedral configuration Cover Japanese tissue grain running spanwise turbulator made model railroading HO gauge scale 2 x 4s wing finished free warps washin washout makes much easier check prior flying ses sion generous amount dihedral correct pylon height will lessen need intentional wing warps Stabilizer Construction straightforward Use lightweight wood can get away coat dope Ft Worth TX coat does job live near water may have use two coats Just keep light possible Note liffle notch trailing edge center mates short peg 1/16 dowel added point rear end body help keep stab line bottom peg also keeps stab hold-down rubber body pre vents interfering dethermal izer DT swivel Propeller assembly Only few plas tic props available suitable P-30 models common Japanese rounded-tip type come green blue silver-gray doesnt seem verifiable difference among some people claim silver ones better propellers 9%-in di ameter 7-in pitch weigh 68 71 grams Another prop style now imported Europe type has square tip has same 9%-in diameter rounded-tip type has 9-in nominal pitch weighs seven grams As far know props available yellow FAT Model Supply carries facsimile prop however gram heavier original fre quently out balance AMA rules illegal shave sand P-30 prop lighten balance comparative evaluation per formance type propeller three different nose block assemblies con structedone round-tip prop Continued page 78 IWiVG MFG Tigerskini4 WHAT DO YOU CALL THE BEST SHEETING MATERIAL FOR FOAM WING CORES Wing Mfg pioneered foam core wing construction early 60s have used everything tangowood 002 stainless steel sheeting last few years have using pressure laminates evolved R & 0 work Uncle Sam Tigurskins pre-finish high density posterboard material clear laminated plastic film top simply apply contact cement such Styro-Stick adhesive cores sheeting press sheeting Onto cores material pliable can easily wrap around leading edges Tigerskins CHECK THESE FEATURES Superior strength weight ratio Superior bond capability foam 001 per sq temperature stability Smooth high gloss finish Superior resistance nitro fuel Superior resistance weather Easy apply Low low cost 01/64 23 35 size Comes following colors Waco Red Polar White Insignia Blue Sun Yellow $495 PER SHEET // pk00417 ORDERING Send check money order required amount Add $395 shipping 1 6 sheets Add $749 shipping 7 12 sheets SEND TO Wing Mfg P0 Boa 33 Crystal Lake IL 60014 Illinois Residents add 6 1/20/0 sales tea Super Styro-Stick wing skin adhesive $598 16 oz Can Item #601 can does wing up 70 No eatra shipping cost ordered Tigerskins See Tigerakins Chicago Model & Hobby Show Booth 1735 SEND $350 FOR CATALOG November 1988 77 ORDERS SHIPPED DAY RECEIVED WARBIRD VIDEOS VHS OR BETA DUR 23RD YEAR R ANY TWO VIDEOS ONLY $7595 ANY 3 VIDEOS ONLY $19795 SPECIAL IMTRDD6TDRY OFFEALL IVIDEOS ONLY $19995 WARBIRD CHECKOUT VOL 1 Flying P-40 Warhawk Corsair Hellcat SB2-A Buccanneer Avenger NF 1325 Programs2 Hr Only $3995 WARBIRD CHECKOUT VOL II Flying P-38 Mitchell Bomber P-61 Black Widow Invader NF 1454 Programsi 00 Mm Only $3995 WARBIRD CHECKOUT VOL III Flying P-Si Mustang A-20 Bomber P-39 Introduction P-39 Advanced NF 1514 Programslb Mm Only $3995 CALL TOLL FREE CREDIT CARDS Li J Day Night California outside USA 213 827-8666 Shi pin Paid Continental US-Foreign add $500 0 California residents add 6 1/2% tax NFVIDEQ LIBRARY 2554 LINCOLN BLVD #568 MARINA DEL REY CA 90291 PRECISION MODEL PRODUCTS ZZ7jjJosM Made U S BARSTOCK ALUMINUM SPINNERS Part NoSize TT-150-B .1-112 TT-175-B .1-314 TT-200-B 11-225-B 14 11-226-B 2114 FAt . TT-250-B .. 2-1/2 11-251-B . 2-1/2FAI .. 11-275-B 3/4 11-276-B 314 FAt .. 11-300-B 11-301-BFAI 11-325-B .. 3-1/4 . TI-350-B . 2 TT-375-B . 3-3/4 . TT-400-B 4 RetailApprox PriceWeight $1395058 02 149509502 1595180oz 169516002 189515002 189519002 209517002 229522002 249520002 2695260oz 289525002 369534002 499547002 5995520oz 699557002 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available Sizes Add $300 Per Spinner PROP NUT ADAPTORS Part No Size 11-140A . 1/4-28 T1-147A -28/7mm 11-610-A 6 x 10mm 11-710-A 10mm 11-516-A 5/16-24 11-518-A 5/16-24/8mm 11-810-A 8 x 10mm 11-825-A 8 x 125mm 11-375-A 3/8-24 11-125-A lOx 125mm Approx Weight 061 oz 061 oz 063 oz 0 82 oz 076 oz 076oz 076 oz 075 oz 117 oz 115 oz 3 Pieces Nut Washer Machined Bushing Add $350 Shipping Handling Prices subject change notice ROMCO MFG INC OX 836 SOUTH HOUSTON TEXAS 77587 713 943-1867 square-tip prop dummy nose same weight glide tested times bleachers local Indoor site square-tip prop consist ently showed approximately 15% longer en durance other types probably due its higher pitch lower blade area higher pitch has also appeared help climb reducing initial difficult-tomanage acceleration increasing length prop run small degree havent discovered method accurately determining prop gave P-30 higher climb prop nose block assembled standard way freewheel notch prop will work better last longer short outer end shaft bent first about 950 small bend radius pos sible Assemble bend hooked part last Assembly first five Sparrow Hawks lost thermals though conven tional pop-up-tail dethermalizer acti vated Two disappeared straight up taught us very light wing loading P-30 requires something reliable standard DT method have used last five ships variation system first used Ken Wer nicke locally may have invented George Xenakis works like DT fuse like Pecks 3/10-in-diameter lightweight fuse burns through #32 rubberband wing [ hold-down wing pops off re tained 12-lb-test monofilament fish ing line attached wing tip swivel tail end fuselage freewheel prop spinning wing re strain model during fall Using system Sparrow Hawk has never failed break out strongest thermal yet model has landed con crete runways prop nose breaking slight drawback method can difficult extricate model tree fishing line wrapped around branches solution simply cut line carry extra sup ply Dont try tie fishing line short piece Y16-diameter aluminum tubing squeezed pliers both easier adjust reliable short piece head end straight pin protrudes top wing centerline assemble wing body fishing line pulled tight tail over stab around pin out wing tip Monofilament line has sufficient stretch stay taut its proper length wing hold-down rub berband goes over line hold place during flight wing place check square body centerline Glue four keys made split halves 1A-in dowel onto wing will serve guides ensure accurate positioning reattaching wing Continued page 175 @cMlPL 8b 78 Model Aviation Retail Price S495 495 495 495 495 495 495 495 595 595 t1C IN SPIHHJ11 WELL---- YR GOT THE PLANE IN BUT WHERE ARE WE GONNR 0 -v /0 lizer braces 2/ x -in softwing TEs 1 x 1 x 4-in soft blocknose & tail blocks Other Wood l%2 x x 19-in hardwood stripflap & eleva tor joiners plywood approx 1 x 7 firewall landing gear bulkhead bellcrank mount 1A x x 13-in hardwoodmotor mounts Other Materials Plans Building board Straight pins Wax paper 1Cox Tee Dee 049 051 engine 1propeller 6 x 4 Cox plastic Top Flite Zinger wood 11-in plastic spinner Ace RC Inc 1-oz wedge fuel tank Perfect #20 /s x 4-in brats tubingtank vent extension leadout guides 2 small plastic flexible fuel line /16 x 28-in music wtrepushrods landing gear 032 x 4-in music wiretailskid 12-in bellcrank mounting hardware Perfect comparable 36-in length braided lead-out line Perfect com parable 1 pairflying wire clips Perfect Du-Bro com parable 1 pair1%-in-dia plastic wheels Sig comparable 1 pair/s-in wheel collars Perfect Du-Bro comparable 42-56 x -in engine mounting bolts locknuts 2small control horns Perfect comparable flaps elevator 4wire pushrod keepers /6-in-dia music wire 48% x -in similar size fabric control surface hinges Aliphatic resin glue Franklin Tite Bond compar able Five-minute epoxy glue Duro comparable Garnet paper 100- 200-grit Norton compa rable Wet-or-dry paper 400-grit 3M comparable 1 sheetlightweight silkspan Fuel-proof dopeSig clear sanding sealer Diana Cream Stearman Red comparable 1-in numerals AMA license number 1 set012-inx 35-ft braided steel flying wire Sul livan comparable 1A control handle Sullivan comparable Cox Super Power Glow Fuel above parts materials should available local hobby shop Theres word some streets supplies Con trol Line models arent available anymore weve found true able secure everything needed build Lil Bit other models Johnny Clemens Hobby Counter Dallas know other shops stock order Control Line supplies So dont accept Geewe cant get anymore cause its just true Control Line alive Sparrow Hawk/ODwyer Continued page 78 Sparrow Hawk flies best four strands 3/6-in rubber Ten grams FM Champion rubber will 78 80 long Wash off powder coats rubber soapy water Use following method tying rubber will never slip Tie single overhand knot close end possible Laying two ends adja cent other tie another overhand knot two strands Use liberal amounts Continued page 178 Finest Kits Youll Ever Buy Build TraIn-Air 20 Train-Air 40 Sport-Air 40 Bel-AIr 40 40 Hydro-Floats rsa eesy handling uperior serobetic modern looking sport exhibition biplane has filled 55, 6 75 lbs 148 185 207-4901M1 Wise & Uastereeu4ed 1 KIT FEATURES Polyester fiberglass fusalage cowling retractable landing 92 wingspan gear Foam cores wing stab Available major production variations F4F-3 -3A -4 FM-i FM-2 Semi-Kit Fusalage cowling foam cores wing stab canopy retractable landing gear plans$27500 Complete Kit Everything listed semi-kit plus wood parts hardware necessary complete kit including 1/64 plywood sheeting wings$45000 Deluxe Kit Complete kit fusalage preassembled $85000 wings stab presheeted control surfaces prebuilt Information Package $100 VISA/MasterCard accepted add $1500 sh pp ng daho es add 5% Sa es tax Classic Glass PO Box 503 Blackfoot Idaho 83221-0503 Mike Zamber 208 785-2309 November 1988 175 fine tine kits ate machine cut sasist building reel show 80 has fully summetricel wing sections gives gresteat potential serobstic er upflght Inverted ship cspsble very slow close-In type flight right up robatic schedule can muster Classic Glass Grumman Wildcat B limEd ATIIE BEST IN ELECTRIC FLIGHT SPECIALIZING IH ASTRO FLIBHT SYSTEM -ENflI 111 ___________________________________________________ 1 I -RRl i 5l 1j CS Flight SgsteNs 31 Perrj Street Hiddlebero M 023483117 Phone 617947-2905 6 9 P H Go . Fredy Glow PIL 15 volt saliva lubricate knot pulled very tight small knots acting limit stops Cut off excess Coat rubber good grade rub ber lube install body tube push stick adequate length rear rubber support tube retained small rubberband shown photo Put two small rubberbands front end body tube behind little trian gles bands serves backnp difficult replace mo tor wound Cut short piece DT fuse slide snuffer tube use pair tweezers hold back wing mount rubberband sure positioned designed modernDealer hnuerle ported engines Dealer Inquiries Invited S Part Cam*ea% Auos 9w against fuse once latter place against snuffer tube Check center-of-gravity prop installed should balance rear spar bot tom surface wing off either direction little lead tape needed light end course out-of-balance situation can avoided entirely waiting until time glue pylon onto body Check Sparrow Hawk over warps wing tail steam out neces sary plan use model competi tion put AMA number right panel name address some plane Im usually eager go fly write AMA number black marking pen use mail address stickers name Since lost P-30s have returned maybe should also mention reward address label Flying Wait calm day test fly Before flying session lubricate prop shaft thin oil such sewing machine oil type comes neat pen cil dispenser fits nicely toolbox Test glide shim trim rear stab support until obtain slowest possi ble glide stalling Using winder put about 200 turns motor use various holes notches flagged safety pin see pho tos obvious Light DT fuse another piece fuse Never use match cigarette lighter light fuse air plane nitrate dope tissue al explosive WILLIAMS ACCESSORIES BROTHERS 4 PILOTS STANDARD TSMAN 0 RACING TAR VINTAGE TH CONTOUR BALLOON EN AGE 178 Model Aviation 10 Sparrow Hawk/ODwyer Continued page 175 HI-TECH ENCODER microprocessor based encoder board designed replace encoder board Futaba Conquest Ace Silver Seven transmitters compatible other AM FM radios market FEATURES complete calibration system use trimpots stores calibration constants four aircraft maintained during power off can mix first five channels other first five channels variety configoratiom exponential trim five strengtlss mixing expo trim can turned off during flight contrul trun throttle cntoff dual-rates servo reversing outputs four eight channels POWER REQUIREMENTS 32ma @ 96vdc SIZE 3 x45 x 75 inches SEND $400 installation operation manual oaly $17500 completely assembled tested encoder installation operation manual Please stare transmitter nwdel number channels Add $500 shipping handling EMULATION ELECTRONICS 2206 S Lynn Urbana 1L61801 217-344-8740or217-4697647 PARABELLUM 1975 July first issue 1976 197701982 197801983 1979-9-4-9641980-9--4-9&5198101986 i0 0 0 i0 Enclose separate $2200 check set ordered NO CASH NO CHARGES I I I I I r Print carefully shipping label II II Name II Street Addresa HStateZIP II Make checks payable AMA Send orders Academy Model Aeronautics 1810 Samuel Morse Dr Reston VA 22090 Linrnrn. urn urn ml Launch model positioning slightly nose up little left wind thrust line angles adequate model should gently climb right spiral about 10 seconds glide large left circle use short DT fuse forewarned Sparrow Hawk could startle disassembling itself air coming straight down plane does climb 200 turns flies much faster glide speed downthrust should reduced flight speed slow theres no climb try find some peppier rubber speed up right turn tight very lit tle climb reduce right thrust try again 200 turns Always use DT fuse simplest test flight things look good gradually increase number turns 650 700 about 500 turns will encounter so-called knee-in-the-torque curve sharply rapid rise potential power output Its zone Scale sport fliers tend give up win contest have keep trimming model zooms near-vertical 50 ft drops off right center-of-gravity should moved aft elevator angle reduced correct glide Dont change thrust line plane flew well 200 turns entire books have written adjusting Free Flight models theres still no substitute lot practice litfie experimenting own great deal can learned small model like P-30 anxiety worry associ ated flying bigger expensive After crashing P-30 wouldnt such big deal hold back optimal glide remember freewheel prop way out front de stabilizing influence functions gyro Therefore slower glide less effect prop will have Ill see next contest bring Sparrow Hawk well both have win ners Good luck Reno/Berliner Continued page 92 next year 1973 saw quite few rec ords overturned Lyle Shelton Wright R-3350-powered Bearcat turned time trials record 427 mph finals record 428 mph Formula Falck set qualifier record 235 mph Cote won finals 231 mph Among small field Sport Biplanes new all-metal Sundancer flown Sid White recordsetting 194 mph time trials 195 mph finals AT-6 time trials winner Jim Mott 211 mph Bill Turnbull took finals 207 mph 1974 Lyle Shelton came through another time trials record 432 mph Un limited bowed Ken Burnstine 382 mph finals hot ones dropped out Formula Ray Cote also scored record speeds 240 mph Name Street Address city State Zip HOBg RNATIONAL iNc November 1988 179 Modelers aioice High Quality Convenient Size Modest Price Jr Kwik Set Epoxy 5 OL $695 Gas Model Products 8773 Russet Dr Cincinnati OH 45239 dealer call 513-385-7398 order direct add *1 50 postage AMA INATONAII CENTENFOR Collectors Notice Just released AMA Museum BACK ISSUES Model Aviation magazinesNEW original car tons sale YEAR SETS ONLY Check selections below send SEPARATE $2200 CHECK individual set Orders will filled first-come basis set request sold out check will returned being cashed Limited Quantities Sets Are Complete L VIA
Edition: Model Aviation - 1988/11
Page Numbers: 72, 73, 74, 75, 76, 77, 78, 175, 178, 179
Hawk P-30 class has become popular cate gories out door Free Flight modeling can join ranks design thats proven winner John ODwyer WHY YOU ASK another P-30 swer should dear competitors heart P-30 lives up hopes designed really winand win does Sparrow Hawk definitely outper forms breed has placed con test its competed yet airplane maintains relative simplicity belies its capabilities As retired aeronautical engineer relative newcomer Free Flight modeling looking challenging event start off After reading rules roughed out first P-30 built flew itor tried Heavy ugly model barely got airborne Clearly better way decided use some experience education design betterperforming P-30 point lets review AMA rules P-30 40-gram minimum weight probably important consideration 30-in maximum dimension no long skinny efficient high aspect ratio wings 10 grams rubber use effectively freewheel plastic prop between 905 984 in diameter Are plastic props alike Other challenges became apparent de velopment progressed will cov ered later thing 40 years experience de signing full-scale aircraft will make totally obvious excess weight invariably primary reason poor performance Hence want competitive model keeping weight down should number consideration achieve need scale Any scale such pos tal scale weight watchers scale will Best though good threebeam laboratory scale calibrated grams 72 Model Aviation Sparrow Above A lot research went making simple-looking airplane consistent contest winner has become Fortunately hard work has already done re mains construct per plans instructions article Below author young friend Sean Bridges wind up again another trip Texas skies Thus equipped can weigh several piec es balsawood pick lightestor discover two apparenfly identical plas tic props actually differ weight two grams Also scale allows check youre flying maximum legal weight rubber arent shortchang ing yourself have simple postal scale calibrated ounces ounce equals 2834 grams 1 oz little 40 grams /4 oz slightly less 10 grams Since wingspan limited 30 low aspect ratio low wing loading seem best An aspect ratio betwecn 61 71 indicated lower limit several rea sons including rapid rise induced drag structural stability wingspan being compromise can least compensate using best possible air foil Airfoil requirements small slow Left When fastening monofilament line swivel use piece aluminum tubing crimped over lines end instead trying tie knot will inevitably sup out Right other end monofilament line permanently attached models left wing tip November 1988 73 balsa sheet trimmed shape before its formed around broom handle make body tube four pieces right glued together make wing mounting pylon aft end bulkhead mini swivel Once wing pops off its pylon dethermaliz ing remains connected fuselage piece monofilament line tied swivel pylon glued body tube CyA Placed shown acts partial exter nal bulkhead strengthening bodys center Cut out middle pylon save weight rear edge pylon notched cen ter snuffer tube Dark band around tube 24-hr epoxy Use sparingly its heavy plane like differ greatly what full-size aircraft need airfoils spe cifically designed low-speed regime considered Much has written subject Among authoritative works published Dieter Althaus based studies low-speed tunnel Stuttgart Germany Using P-30 model flight speed 8 10 ft per sec mea sured test gliding bleachers local gym best airfoil size speed appeared Sokolov Russian Glider section exhibited very good lift/drag ratio 601 tar bulator Lift/drag ratio best index gliding efficiency Sokolov mea sured nearly 80% higher easy-touse flat-bottomed Clark Y airfoil shape author lost first five Sparrow Hawks usual pop-up stab OTing failed bring back down Popping wing off way almost always gets model out thermal brings safely back down Left A common straight pin holds DT line place wing center rubberband secured Once band place lift line over pinhead rubberband will hold place against sandpaper Right band wrapped around fuselage strengthen area rear motor peg small rubberband keeps hollow peg place after tension rubber motor gone Lett The two side notcnes nob inc satety pin piace wouna moipr untii prop can installed safety pin piaced inc nose block prevent prop turning nose plug holding bands other backup hooked DT fuse lit 74 Model Aviation DT line runs along upper surface wing under hold-down rubberband back along left side fin over stab swivel end body tube Full-Size Plans Available Page 186 Fuselage first rolled tube fu selage building can kind fun begin selecting correct wood ex tremely important Whats required very straight-grained 3 x 36 x sheet medium-lightweight balsa Sig has good balsa have also found Mid west balsa carried local hobby shop very even-grained light /32 sheet thin enough can held up light check uniformity grain Reject sheets dark streaks indi cate harder-grained wood may crack rolled 3-in-wide sheet 1/3 thickness will make tube roughly 1 in diameter Thats bigger wound P-30 motor can save weight using smaller dia meter Trim /16 edge sheet along its full length cut off end length 281/2 Again save weight taper rear half %-in diame ter Referring photo prepared sheet cut two % x 14-in triangles part flat sheet will become tail end Apply two coats undiluted dope inside surface fuselage allowing about two hours drying between coats will seal inside against rubber lu bricant add strength cause tube curl like magic wet Locate broom handle something comparable % in diameter will serve mandrel body tube formed After dope thoroughly dry curl tube soaking balsa hot water bathtub about 10 min utes couple wet washcloths will hold balsa underwater soaks Place sheet broom handle wrap Ace bandage gauze strips some stretchable cloth will al Continued page 76 0 2 L aft 00 O S 2 / 012 / NH] 21 4 II ft -JK S 00 21 t0 S H 7 Li 7 E B 21 hft aa 20 Ca ft 50T ft 6 00 N 0 ft 0 L i1 K 02F 2 K4z November 1988 75 5 id 00 4 lx 4 LI Four keys black areas made two pieces dowel have split halves keys place accurate wing location pylon assured time 12 2- B aI 21Ja 2 L5kK j~ low wet tube diy handle dow el should large enough straight edges tube quite touch course tapered edges farther apart never fear will deal topic later Carefully set whole thing aside allow dry about 24 hours Cut 7-in piece off end sheet cut cross grain four equal pieces shown photo glued together edges using cyano acrylate CyA make 1% x 12-in strip will formed wing mount py lon Among CyAs Ive best luck Goldbergs Super Jet mediumviscosity fast-setting glue Make wing mount pylon using two symmetrical airfoils shown plans way make accurate copy obtain good dark Xerox copy full-size drawing Lay Xerox copy face down appropriate balsa sheet using dry flatiron MonoKote iron press down backside neatly transfer image balsa twice have two ribs Glue two ribs gether small spar-like rectangles shown Roughiy center subassembly 12-in-long A2 sheet equal amounts above below glue nose Working gradually attach side around trailing edge using CyA cut off excess rear Rough shape upper lower surfaces leave plenty material sanding time basic fuselage tube should dry Remove bandage slide mandrel straight sec tion tube can easily squeezed gether carefully secured CyA Once straight portion glued aft taper can closed Always keeping weight savings mind take care use too much CyA / ply bands shown drawing added both inside outside nose latter being rear rubber post two bands made -in-wide strips /-in-thick plywood about 3 long Make sure outside grain running direction /2-in strips Soak bands hot water wrap around mandrel used main body tube Hold plywood bands place rubberbands until dry adhere CyA Shape pylon mounting body tube sanding 180-grit paper wrapped around either mandrel fu selage body itself Attach aluminum snuffer tube angle shown using slowdrying metal bond epoxy Since epoxy very heavy sure use enough form narrow band around tube Sand both fuselage body tube pylon smooth surface reduce weight ribs pylon may cut out somewhat reduce weight further Locate glue pylon 6% 7 nose body important seam tube positioned bottom centerline before pylon attached Cut out disc / plywood making diameter aft end body tube Drill /l6 hole center insert through end small fishing swiv el short piece pin will prevent its re moval Secure swivel clear fiveminute epoxy Glue disc shown aft end fuselage body tube rein forcing couple small strips silk nylon single wrap h-in-wide silk fiveminute epoxy will strengthen front end well After epoxy has set up front cut three hes forward edge purpose upper po sition nose plug two side notches keep winding safety pin turning during transition winding motor installing prop fm made directly separate plan view facing right since cambered left turn flat left side Before begin make Xerox copies fin tail ribs use pat terns transferring wood use flat piece ceiling panel material work surface making wings tails first spray light coat Scotch spray adhesive board stick sec tion appropriate plan board spray plan section light coat same adhesive Caution sure keep spray light Cover plan section sheet wax paper latter works much better anything have tried cement super glue epoxy will stick damage plan Afterwards wax paper peels off plan leaving slightly sticky day Once youve made fin sand lightly paint outer edges coat Aero Gloss Balsa Sanding Sealer Cut Japanese tissue following grain longest dimension fin Coat struc ture thick dope lay tissue stretching out wrinldes problem areas dampen lit tle thinner trailing edge fin intended long enough extend through body tube add strength attachment Line up fin vertical wing pylon flat side fin should par allel body centerline stabilizer rest glued body tube left side about degree high aid left turn glide Water shrink fin tissue brush coat very thin nitrate dope Finish painting two coats thin sanding sealer waterproof outside body tube pylon sanding lightly between coats Wing fairly standard construction techaiques followed few suggestions order Iron Xerox copy main wing rib piece A2 plywood white painted aluminum carefully cut file shape Use template cut out ribs Stack balsa ribs us ing two pieces scrap /6-sq balsa 76 Model Aviation ii 0 m 0 K I 1 0 -I ii 0 z z 0 I0 C C n 0 z 0 z C, 0 -u 0 -a m I m 0 Q C -I CD C, C 0 C, 1 0 U 0 0 01 0 LzU N 0 C S S. S. CA S. CA x oo x x oo mini 01 x oo x S. x U spar grooves Sand stack ribs uniform contour length Pin down trailing edge waxpaper-covered plan using some scrap piec es wood block up forward edge /32 46-sq rib jig strip located about ard trailing edge preparation assures accurate undercamber extremely important low-speed airfoil triangular dihedral checker used assure center ribs set proper angle prior gluing place completed half removed plans propped up correct dihedral gle glued together quite bit Super Jet CyA rather steep V di hedral V saves about 1 grams weight over polyhedral configuration Cover Japanese tissue grain running spanwise turbulator made model railroading HO gauge scale 2 x 4s wing finished free warps washin washout makes much easier check prior flying ses sion generous amount dihedral correct pylon height will lessen need intentional wing warps Stabilizer Construction straightforward Use lightweight wood can get away coat dope Ft Worth TX coat does job live near water may have use two coats Just keep light possible Note liffle notch trailing edge center mates short peg 1/16 dowel added point rear end body help keep stab line bottom peg also keeps stab hold-down rubber body pre vents interfering dethermal izer DT swivel Propeller assembly Only few plas tic props available suitable P-30 models common Japanese rounded-tip type come green blue silver-gray doesnt seem verifiable difference among some people claim silver ones better propellers 9%-in di ameter 7-in pitch weigh 68 71 grams Another prop style now imported Europe type has square tip has same 9%-in diameter rounded-tip type has 9-in nominal pitch weighs seven grams As far know props available yellow FAT Model Supply carries facsimile prop however gram heavier original fre quently out balance AMA rules illegal shave sand P-30 prop lighten balance comparative evaluation per formance type propeller three different nose block assemblies con structedone round-tip prop Continued page 78 IWiVG MFG Tigerskini4 WHAT DO YOU CALL THE BEST SHEETING MATERIAL FOR FOAM WING CORES Wing Mfg pioneered foam core wing construction early 60s have used everything tangowood 002 stainless steel sheeting last few years have using pressure laminates evolved R & 0 work Uncle Sam Tigurskins pre-finish high density posterboard material clear laminated plastic film top simply apply contact cement such Styro-Stick adhesive cores sheeting press sheeting Onto cores material pliable can easily wrap around leading edges Tigerskins CHECK THESE FEATURES Superior strength weight ratio Superior bond capability foam 001 per sq temperature stability Smooth high gloss finish Superior resistance nitro fuel Superior resistance weather Easy apply Low low cost 01/64 23 35 size Comes following colors Waco Red Polar White Insignia Blue Sun Yellow $495 PER SHEET // pk00417 ORDERING Send check money order required amount Add $395 shipping 1 6 sheets Add $749 shipping 7 12 sheets SEND TO Wing Mfg P0 Boa 33 Crystal Lake IL 60014 Illinois Residents add 6 1/20/0 sales tea Super Styro-Stick wing skin adhesive $598 16 oz Can Item #601 can does wing up 70 No eatra shipping cost ordered Tigerskins See Tigerakins Chicago Model & Hobby Show Booth 1735 SEND $350 FOR CATALOG November 1988 77 ORDERS SHIPPED DAY RECEIVED WARBIRD VIDEOS VHS OR BETA DUR 23RD YEAR R ANY TWO VIDEOS ONLY $7595 ANY 3 VIDEOS ONLY $19795 SPECIAL IMTRDD6TDRY OFFEALL IVIDEOS ONLY $19995 WARBIRD CHECKOUT VOL 1 Flying P-40 Warhawk Corsair Hellcat SB2-A Buccanneer Avenger NF 1325 Programs2 Hr Only $3995 WARBIRD CHECKOUT VOL II Flying P-38 Mitchell Bomber P-61 Black Widow Invader NF 1454 Programsi 00 Mm Only $3995 WARBIRD CHECKOUT VOL III Flying P-Si Mustang A-20 Bomber P-39 Introduction P-39 Advanced NF 1514 Programslb Mm Only $3995 CALL TOLL FREE CREDIT CARDS Li J Day Night California outside USA 213 827-8666 Shi pin Paid Continental US-Foreign add $500 0 California residents add 6 1/2% tax NFVIDEQ LIBRARY 2554 LINCOLN BLVD #568 MARINA DEL REY CA 90291 PRECISION MODEL PRODUCTS ZZ7jjJosM Made U S BARSTOCK ALUMINUM SPINNERS Part NoSize TT-150-B .1-112 TT-175-B .1-314 TT-200-B 11-225-B 14 11-226-B 2114 FAt . TT-250-B .. 2-1/2 11-251-B . 2-1/2FAI .. 11-275-B 3/4 11-276-B 314 FAt .. 11-300-B 11-301-BFAI 11-325-B .. 3-1/4 . TI-350-B . 2 TT-375-B . 3-3/4 . TT-400-B 4 RetailApprox PriceWeight $1395058 02 149509502 1595180oz 169516002 189515002 189519002 209517002 229522002 249520002 2695260oz 289525002 369534002 499547002 5995520oz 699557002 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available Sizes Add $300 Per Spinner PROP NUT ADAPTORS Part No Size 11-140A . 1/4-28 T1-147A -28/7mm 11-610-A 6 x 10mm 11-710-A 10mm 11-516-A 5/16-24 11-518-A 5/16-24/8mm 11-810-A 8 x 10mm 11-825-A 8 x 125mm 11-375-A 3/8-24 11-125-A lOx 125mm Approx Weight 061 oz 061 oz 063 oz 0 82 oz 076 oz 076oz 076 oz 075 oz 117 oz 115 oz 3 Pieces Nut Washer Machined Bushing Add $350 Shipping Handling Prices subject change notice ROMCO MFG INC OX 836 SOUTH HOUSTON TEXAS 77587 713 943-1867 square-tip prop dummy nose same weight glide tested times bleachers local Indoor site square-tip prop consist ently showed approximately 15% longer en durance other types probably due its higher pitch lower blade area higher pitch has also appeared help climb reducing initial difficult-tomanage acceleration increasing length prop run small degree havent discovered method accurately determining prop gave P-30 higher climb prop nose block assembled standard way freewheel notch prop will work better last longer short outer end shaft bent first about 950 small bend radius pos sible Assemble bend hooked part last Assembly first five Sparrow Hawks lost thermals though conven tional pop-up-tail dethermalizer acti vated Two disappeared straight up taught us very light wing loading P-30 requires something reliable standard DT method have used last five ships variation system first used Ken Wer nicke locally may have invented George Xenakis works like DT fuse like Pecks 3/10-in-diameter lightweight fuse burns through #32 rubberband wing [ hold-down wing pops off re tained 12-lb-test monofilament fish ing line attached wing tip swivel tail end fuselage freewheel prop spinning wing re strain model during fall Using system Sparrow Hawk has never failed break out strongest thermal yet model has landed con crete runways prop nose breaking slight drawback method can difficult extricate model tree fishing line wrapped around branches solution simply cut line carry extra sup ply Dont try tie fishing line short piece Y16-diameter aluminum tubing squeezed pliers both easier adjust reliable short piece head end straight pin protrudes top wing centerline assemble wing body fishing line pulled tight tail over stab around pin out wing tip Monofilament line has sufficient stretch stay taut its proper length wing hold-down rub berband goes over line hold place during flight wing place check square body centerline Glue four keys made split halves 1A-in dowel onto wing will serve guides ensure accurate positioning reattaching wing Continued page 175 @cMlPL 8b 78 Model Aviation Retail Price S495 495 495 495 495 495 495 495 595 595 t1C IN SPIHHJ11 WELL---- YR GOT THE PLANE IN BUT WHERE ARE WE GONNR 0 -v /0 lizer braces 2/ x -in softwing TEs 1 x 1 x 4-in soft blocknose & tail blocks Other Wood l%2 x x 19-in hardwood stripflap & eleva tor joiners plywood approx 1 x 7 firewall landing gear bulkhead bellcrank mount 1A x x 13-in hardwoodmotor mounts Other Materials Plans Building board Straight pins Wax paper 1Cox Tee Dee 049 051 engine 1propeller 6 x 4 Cox plastic Top Flite Zinger wood 11-in plastic spinner Ace RC Inc 1-oz wedge fuel tank Perfect #20 /s x 4-in brats tubingtank vent extension leadout guides 2 small plastic flexible fuel line /16 x 28-in music wtrepushrods landing gear 032 x 4-in music wiretailskid 12-in bellcrank mounting hardware Perfect comparable 36-in length braided lead-out line Perfect com parable 1 pairflying wire clips Perfect Du-Bro com parable 1 pair1%-in-dia plastic wheels Sig comparable 1 pair/s-in wheel collars Perfect Du-Bro comparable 42-56 x -in engine mounting bolts locknuts 2small control horns Perfect comparable flaps elevator 4wire pushrod keepers /6-in-dia music wire 48% x -in similar size fabric control surface hinges Aliphatic resin glue Franklin Tite Bond compar able Five-minute epoxy glue Duro comparable Garnet paper 100- 200-grit Norton compa rable Wet-or-dry paper 400-grit 3M comparable 1 sheetlightweight silkspan Fuel-proof dopeSig clear sanding sealer Diana Cream Stearman Red comparable 1-in numerals AMA license number 1 set012-inx 35-ft braided steel flying wire Sul livan comparable 1A control handle Sullivan comparable Cox Super Power Glow Fuel above parts materials should available local hobby shop Theres word some streets supplies Con trol Line models arent available anymore weve found true able secure everything needed build Lil Bit other models Johnny Clemens Hobby Counter Dallas know other shops stock order Control Line supplies So dont accept Geewe cant get anymore cause its just true Control Line alive Sparrow Hawk/ODwyer Continued page 78 Sparrow Hawk flies best four strands 3/6-in rubber Ten grams FM Champion rubber will 78 80 long Wash off powder coats rubber soapy water Use following method tying rubber will never slip Tie single overhand knot close end possible Laying two ends adja cent other tie another overhand knot two strands Use liberal amounts Continued page 178 Finest Kits Youll Ever Buy Build TraIn-Air 20 Train-Air 40 Sport-Air 40 Bel-AIr 40 40 Hydro-Floats rsa eesy handling uperior serobetic modern looking sport exhibition biplane has filled 55, 6 75 lbs 148 185 207-4901M1 Wise & Uastereeu4ed 1 KIT FEATURES Polyester fiberglass fusalage cowling retractable landing 92 wingspan gear Foam cores wing stab Available major production variations F4F-3 -3A -4 FM-i FM-2 Semi-Kit Fusalage cowling foam cores wing stab canopy retractable landing gear plans$27500 Complete Kit Everything listed semi-kit plus wood parts hardware necessary complete kit including 1/64 plywood sheeting wings$45000 Deluxe Kit Complete kit fusalage preassembled $85000 wings stab presheeted control surfaces prebuilt Information Package $100 VISA/MasterCard accepted add $1500 sh pp ng daho es add 5% Sa es tax Classic Glass PO Box 503 Blackfoot Idaho 83221-0503 Mike Zamber 208 785-2309 November 1988 175 fine tine kits ate machine cut sasist building reel show 80 has fully summetricel wing sections gives gresteat potential serobstic er upflght Inverted ship cspsble very slow close-In type flight right up robatic schedule can muster Classic Glass Grumman Wildcat B limEd ATIIE BEST IN ELECTRIC FLIGHT SPECIALIZING IH ASTRO FLIBHT SYSTEM -ENflI 111 ___________________________________________________ 1 I -RRl i 5l 1j CS Flight SgsteNs 31 Perrj Street Hiddlebero M 023483117 Phone 617947-2905 6 9 P H Go . Fredy Glow PIL 15 volt saliva lubricate knot pulled very tight small knots acting limit stops Cut off excess Coat rubber good grade rub ber lube install body tube push stick adequate length rear rubber support tube retained small rubberband shown photo Put two small rubberbands front end body tube behind little trian gles bands serves backnp difficult replace mo tor wound Cut short piece DT fuse slide snuffer tube use pair tweezers hold back wing mount rubberband sure positioned designed modernDealer hnuerle ported engines Dealer Inquiries Invited S Part Cam*ea% Auos 9w against fuse once latter place against snuffer tube Check center-of-gravity prop installed should balance rear spar bot tom surface wing off either direction little lead tape needed light end course out-of-balance situation can avoided entirely waiting until time glue pylon onto body Check Sparrow Hawk over warps wing tail steam out neces sary plan use model competi tion put AMA number right panel name address some plane Im usually eager go fly write AMA number black marking pen use mail address stickers name Since lost P-30s have returned maybe should also mention reward address label Flying Wait calm day test fly Before flying session lubricate prop shaft thin oil such sewing machine oil type comes neat pen cil dispenser fits nicely toolbox Test glide shim trim rear stab support until obtain slowest possi ble glide stalling Using winder put about 200 turns motor use various holes notches flagged safety pin see pho tos obvious Light DT fuse another piece fuse Never use match cigarette lighter light fuse air plane nitrate dope tissue al explosive WILLIAMS ACCESSORIES BROTHERS 4 PILOTS STANDARD TSMAN 0 RACING TAR VINTAGE TH CONTOUR BALLOON EN AGE 178 Model Aviation 10 Sparrow Hawk/ODwyer Continued page 175 HI-TECH ENCODER microprocessor based encoder board designed replace encoder board Futaba Conquest Ace Silver Seven transmitters compatible other AM FM radios market FEATURES complete calibration system use trimpots stores calibration constants four aircraft maintained during power off can mix first five channels other first five channels variety configoratiom exponential trim five strengtlss mixing expo trim can turned off during flight contrul trun throttle cntoff dual-rates servo reversing outputs four eight channels POWER REQUIREMENTS 32ma @ 96vdc SIZE 3 x45 x 75 inches SEND $400 installation operation manual oaly $17500 completely assembled tested encoder installation operation manual Please stare transmitter nwdel number channels Add $500 shipping handling EMULATION ELECTRONICS 2206 S Lynn Urbana 1L61801 217-344-8740or217-4697647 PARABELLUM 1975 July first issue 1976 197701982 197801983 1979-9-4-9641980-9--4-9&5198101986 i0 0 0 i0 Enclose separate $2200 check set ordered NO CASH NO CHARGES I I I I I r Print carefully shipping label II II Name II Street Addresa HStateZIP II Make checks payable AMA Send orders Academy Model Aeronautics 1810 Samuel Morse Dr Reston VA 22090 Linrnrn. urn urn ml Launch model positioning slightly nose up little left wind thrust line angles adequate model should gently climb right spiral about 10 seconds glide large left circle use short DT fuse forewarned Sparrow Hawk could startle disassembling itself air coming straight down plane does climb 200 turns flies much faster glide speed downthrust should reduced flight speed slow theres no climb try find some peppier rubber speed up right turn tight very lit tle climb reduce right thrust try again 200 turns Always use DT fuse simplest test flight things look good gradually increase number turns 650 700 about 500 turns will encounter so-called knee-in-the-torque curve sharply rapid rise potential power output Its zone Scale sport fliers tend give up win contest have keep trimming model zooms near-vertical 50 ft drops off right center-of-gravity should moved aft elevator angle reduced correct glide Dont change thrust line plane flew well 200 turns entire books have written adjusting Free Flight models theres still no substitute lot practice litfie experimenting own great deal can learned small model like P-30 anxiety worry associ ated flying bigger expensive After crashing P-30 wouldnt such big deal hold back optimal glide remember freewheel prop way out front de stabilizing influence functions gyro Therefore slower glide less effect prop will have Ill see next contest bring Sparrow Hawk well both have win ners Good luck Reno/Berliner Continued page 92 next year 1973 saw quite few rec ords overturned Lyle Shelton Wright R-3350-powered Bearcat turned time trials record 427 mph finals record 428 mph Formula Falck set qualifier record 235 mph Cote won finals 231 mph Among small field Sport Biplanes new all-metal Sundancer flown Sid White recordsetting 194 mph time trials 195 mph finals AT-6 time trials winner Jim Mott 211 mph Bill Turnbull took finals 207 mph 1974 Lyle Shelton came through another time trials record 432 mph Un limited bowed Ken Burnstine 382 mph finals hot ones dropped out Formula Ray Cote also scored record speeds 240 mph Name Street Address city State Zip HOBg RNATIONAL iNc November 1988 179 Modelers aioice High Quality Convenient Size Modest Price Jr Kwik Set Epoxy 5 OL $695 Gas Model Products 8773 Russet Dr Cincinnati OH 45239 dealer call 513-385-7398 order direct add *1 50 postage AMA INATONAII CENTENFOR Collectors Notice Just released AMA Museum BACK ISSUES Model Aviation magazinesNEW original car tons sale YEAR SETS ONLY Check selections below send SEPARATE $2200 CHECK individual set Orders will filled first-come basis set request sold out check will returned being cashed Limited Quantities Sets Are Complete L VIA
Edition: Model Aviation - 1988/11
Page Numbers: 72, 73, 74, 75, 76, 77, 78, 175, 178, 179
Hawk P-30 class has become popular cate gories out door Free Flight modeling can join ranks design thats proven winner John ODwyer WHY YOU ASK another P-30 swer should dear competitors heart P-30 lives up hopes designed really winand win does Sparrow Hawk definitely outper forms breed has placed con test its competed yet airplane maintains relative simplicity belies its capabilities As retired aeronautical engineer relative newcomer Free Flight modeling looking challenging event start off After reading rules roughed out first P-30 built flew itor tried Heavy ugly model barely got airborne Clearly better way decided use some experience education design betterperforming P-30 point lets review AMA rules P-30 40-gram minimum weight probably important consideration 30-in maximum dimension no long skinny efficient high aspect ratio wings 10 grams rubber use effectively freewheel plastic prop between 905 984 in diameter Are plastic props alike Other challenges became apparent de velopment progressed will cov ered later thing 40 years experience de signing full-scale aircraft will make totally obvious excess weight invariably primary reason poor performance Hence want competitive model keeping weight down should number consideration achieve need scale Any scale such pos tal scale weight watchers scale will Best though good threebeam laboratory scale calibrated grams 72 Model Aviation Sparrow Above A lot research went making simple-looking airplane consistent contest winner has become Fortunately hard work has already done re mains construct per plans instructions article Below author young friend Sean Bridges wind up again another trip Texas skies Thus equipped can weigh several piec es balsawood pick lightestor discover two apparenfly identical plas tic props actually differ weight two grams Also scale allows check youre flying maximum legal weight rubber arent shortchang ing yourself have simple postal scale calibrated ounces ounce equals 2834 grams 1 oz little 40 grams /4 oz slightly less 10 grams Since wingspan limited 30 low aspect ratio low wing loading seem best An aspect ratio betwecn 61 71 indicated lower limit several rea sons including rapid rise induced drag structural stability wingspan being compromise can least compensate using best possible air foil Airfoil requirements small slow Left When fastening monofilament line swivel use piece aluminum tubing crimped over lines end instead trying tie knot will inevitably sup out Right other end monofilament line permanently attached models left wing tip November 1988 73 balsa sheet trimmed shape before its formed around broom handle make body tube four pieces right glued together make wing mounting pylon aft end bulkhead mini swivel Once wing pops off its pylon dethermaliz ing remains connected fuselage piece monofilament line tied swivel pylon glued body tube CyA Placed shown acts partial exter nal bulkhead strengthening bodys center Cut out middle pylon save weight rear edge pylon notched cen ter snuffer tube Dark band around tube 24-hr epoxy Use sparingly its heavy plane like differ greatly what full-size aircraft need airfoils spe cifically designed low-speed regime considered Much has written subject Among authoritative works published Dieter Althaus based studies low-speed tunnel Stuttgart Germany Using P-30 model flight speed 8 10 ft per sec mea sured test gliding bleachers local gym best airfoil size speed appeared Sokolov Russian Glider section exhibited very good lift/drag ratio 601 tar bulator Lift/drag ratio best index gliding efficiency Sokolov mea sured nearly 80% higher easy-touse flat-bottomed Clark Y airfoil shape author lost first five Sparrow Hawks usual pop-up stab OTing failed bring back down Popping wing off way almost always gets model out thermal brings safely back down Left A common straight pin holds DT line place wing center rubberband secured Once band place lift line over pinhead rubberband will hold place against sandpaper Right band wrapped around fuselage strengthen area rear motor peg small rubberband keeps hollow peg place after tension rubber motor gone Lett The two side notcnes nob inc satety pin piace wouna moipr untii prop can installed safety pin piaced inc nose block prevent prop turning nose plug holding bands other backup hooked DT fuse lit 74 Model Aviation DT line runs along upper surface wing under hold-down rubberband back along left side fin over stab swivel end body tube Full-Size Plans Available Page 186 Fuselage first rolled tube fu selage building can kind fun begin selecting correct wood ex tremely important Whats required very straight-grained 3 x 36 x sheet medium-lightweight balsa Sig has good balsa have also found Mid west balsa carried local hobby shop very even-grained light /32 sheet thin enough can held up light check uniformity grain Reject sheets dark streaks indi cate harder-grained wood may crack rolled 3-in-wide sheet 1/3 thickness will make tube roughly 1 in diameter Thats bigger wound P-30 motor can save weight using smaller dia meter Trim /16 edge sheet along its full length cut off end length 281/2 Again save weight taper rear half %-in diame ter Referring photo prepared sheet cut two % x 14-in triangles part flat sheet will become tail end Apply two coats undiluted dope inside surface fuselage allowing about two hours drying between coats will seal inside against rubber lu bricant add strength cause tube curl like magic wet Locate broom handle something comparable % in diameter will serve mandrel body tube formed After dope thoroughly dry curl tube soaking balsa hot water bathtub about 10 min utes couple wet washcloths will hold balsa underwater soaks Place sheet broom handle wrap Ace bandage gauze strips some stretchable cloth will al Continued page 76 0 2 L aft 00 O S 2 / 012 / NH] 21 4 II ft -JK S 00 21 t0 S H 7 Li 7 E B 21 hft aa 20 Ca ft 50T ft 6 00 N 0 ft 0 L i1 K 02F 2 K4z November 1988 75 5 id 00 4 lx 4 LI Four keys black areas made two pieces dowel have split halves keys place accurate wing location pylon assured time 12 2- B aI 21Ja 2 L5kK j~ low wet tube diy handle dow el should large enough straight edges tube quite touch course tapered edges farther apart never fear will deal topic later Carefully set whole thing aside allow dry about 24 hours Cut 7-in piece off end sheet cut cross grain four equal pieces shown photo glued together edges using cyano acrylate CyA make 1% x 12-in strip will formed wing mount py lon Among CyAs Ive best luck Goldbergs Super Jet mediumviscosity fast-setting glue Make wing mount pylon using two symmetrical airfoils shown plans way make accurate copy obtain good dark Xerox copy full-size drawing Lay Xerox copy face down appropriate balsa sheet using dry flatiron MonoKote iron press down backside neatly transfer image balsa twice have two ribs Glue two ribs gether small spar-like rectangles shown Roughiy center subassembly 12-in-long A2 sheet equal amounts above below glue nose Working gradually attach side around trailing edge using CyA cut off excess rear Rough shape upper lower surfaces leave plenty material sanding time basic fuselage tube should dry Remove bandage slide mandrel straight sec tion tube can easily squeezed gether carefully secured CyA Once straight portion glued aft taper can closed Always keeping weight savings mind take care use too much CyA / ply bands shown drawing added both inside outside nose latter being rear rubber post two bands made -in-wide strips /-in-thick plywood about 3 long Make sure outside grain running direction /2-in strips Soak bands hot water wrap around mandrel used main body tube Hold plywood bands place rubberbands until dry adhere CyA Shape pylon mounting body tube sanding 180-grit paper wrapped around either mandrel fu selage body itself Attach aluminum snuffer tube angle shown using slowdrying metal bond epoxy Since epoxy very heavy sure use enough form narrow band around tube Sand both fuselage body tube pylon smooth surface reduce weight ribs pylon may cut out somewhat reduce weight further Locate glue pylon 6% 7 nose body important seam tube positioned bottom centerline before pylon attached Cut out disc / plywood making diameter aft end body tube Drill /l6 hole center insert through end small fishing swiv el short piece pin will prevent its re moval Secure swivel clear fiveminute epoxy Glue disc shown aft end fuselage body tube rein forcing couple small strips silk nylon single wrap h-in-wide silk fiveminute epoxy will strengthen front end well After epoxy has set up front cut three hes forward edge purpose upper po sition nose plug two side notches keep winding safety pin turning during transition winding motor installing prop fm made directly separate plan view facing right since cambered left turn flat left side Before begin make Xerox copies fin tail ribs use pat terns transferring wood use flat piece ceiling panel material work surface making wings tails first spray light coat Scotch spray adhesive board stick sec tion appropriate plan board spray plan section light coat same adhesive Caution sure keep spray light Cover plan section sheet wax paper latter works much better anything have tried cement super glue epoxy will stick damage plan Afterwards wax paper peels off plan leaving slightly sticky day Once youve made fin sand lightly paint outer edges coat Aero Gloss Balsa Sanding Sealer Cut Japanese tissue following grain longest dimension fin Coat struc ture thick dope lay tissue stretching out wrinldes problem areas dampen lit tle thinner trailing edge fin intended long enough extend through body tube add strength attachment Line up fin vertical wing pylon flat side fin should par allel body centerline stabilizer rest glued body tube left side about degree high aid left turn glide Water shrink fin tissue brush coat very thin nitrate dope Finish painting two coats thin sanding sealer waterproof outside body tube pylon sanding lightly between coats Wing fairly standard construction techaiques followed few suggestions order Iron Xerox copy main wing rib piece A2 plywood white painted aluminum carefully cut file shape Use template cut out ribs Stack balsa ribs us ing two pieces scrap /6-sq balsa 76 Model Aviation ii 0 m 0 K I 1 0 -I ii 0 z z 0 I0 C C n 0 z 0 z C, 0 -u 0 -a m I m 0 Q C -I CD C, C 0 C, 1 0 U 0 0 01 0 LzU N 0 C S S. S. CA S. CA x oo x x oo mini 01 x oo x S. x U spar grooves Sand stack ribs uniform contour length Pin down trailing edge waxpaper-covered plan using some scrap piec es wood block up forward edge /32 46-sq rib jig strip located about ard trailing edge preparation assures accurate undercamber extremely important low-speed airfoil triangular dihedral checker used assure center ribs set proper angle prior gluing place completed half removed plans propped up correct dihedral gle glued together quite bit Super Jet CyA rather steep V di hedral V saves about 1 grams weight over polyhedral configuration Cover Japanese tissue grain running spanwise turbulator made model railroading HO gauge scale 2 x 4s wing finished free warps washin washout makes much easier check prior flying ses sion generous amount dihedral correct pylon height will lessen need intentional wing warps Stabilizer Construction straightforward Use lightweight wood can get away coat dope Ft Worth TX coat does job live near water may have use two coats Just keep light possible Note liffle notch trailing edge center mates short peg 1/16 dowel added point rear end body help keep stab line bottom peg also keeps stab hold-down rubber body pre vents interfering dethermal izer DT swivel Propeller assembly Only few plas tic props available suitable P-30 models common Japanese rounded-tip type come green blue silver-gray doesnt seem verifiable difference among some people claim silver ones better propellers 9%-in di ameter 7-in pitch weigh 68 71 grams Another prop style now imported Europe type has square tip has same 9%-in diameter rounded-tip type has 9-in nominal pitch weighs seven grams As far know props available yellow FAT Model Supply carries facsimile prop however gram heavier original fre quently out balance AMA rules illegal shave sand P-30 prop lighten balance comparative evaluation per formance type propeller three different nose block assemblies con structedone round-tip prop Continued page 78 IWiVG MFG Tigerskini4 WHAT DO YOU CALL THE BEST SHEETING MATERIAL FOR FOAM WING CORES Wing Mfg pioneered foam core wing construction early 60s have used everything tangowood 002 stainless steel sheeting last few years have using pressure laminates evolved R & 0 work Uncle Sam Tigurskins pre-finish high density posterboard material clear laminated plastic film top simply apply contact cement such Styro-Stick adhesive cores sheeting press sheeting Onto cores material pliable can easily wrap around leading edges Tigerskins CHECK THESE FEATURES Superior strength weight ratio Superior bond capability foam 001 per sq temperature stability Smooth high gloss finish Superior resistance nitro fuel Superior resistance weather Easy apply Low low cost 01/64 23 35 size Comes following colors Waco Red Polar White Insignia Blue Sun Yellow $495 PER SHEET // pk00417 ORDERING Send check money order required amount Add $395 shipping 1 6 sheets Add $749 shipping 7 12 sheets SEND TO Wing Mfg P0 Boa 33 Crystal Lake IL 60014 Illinois Residents add 6 1/20/0 sales tea Super Styro-Stick wing skin adhesive $598 16 oz Can Item #601 can does wing up 70 No eatra shipping cost ordered Tigerskins See Tigerakins Chicago Model & Hobby Show Booth 1735 SEND $350 FOR CATALOG November 1988 77 ORDERS SHIPPED DAY RECEIVED WARBIRD VIDEOS VHS OR BETA DUR 23RD YEAR R ANY TWO VIDEOS ONLY $7595 ANY 3 VIDEOS ONLY $19795 SPECIAL IMTRDD6TDRY OFFEALL IVIDEOS ONLY $19995 WARBIRD CHECKOUT VOL 1 Flying P-40 Warhawk Corsair Hellcat SB2-A Buccanneer Avenger NF 1325 Programs2 Hr Only $3995 WARBIRD CHECKOUT VOL II Flying P-38 Mitchell Bomber P-61 Black Widow Invader NF 1454 Programsi 00 Mm Only $3995 WARBIRD CHECKOUT VOL III Flying P-Si Mustang A-20 Bomber P-39 Introduction P-39 Advanced NF 1514 Programslb Mm Only $3995 CALL TOLL FREE CREDIT CARDS Li J Day Night California outside USA 213 827-8666 Shi pin Paid Continental US-Foreign add $500 0 California residents add 6 1/2% tax NFVIDEQ LIBRARY 2554 LINCOLN BLVD #568 MARINA DEL REY CA 90291 PRECISION MODEL PRODUCTS ZZ7jjJosM Made U S BARSTOCK ALUMINUM SPINNERS Part NoSize TT-150-B .1-112 TT-175-B .1-314 TT-200-B 11-225-B 14 11-226-B 2114 FAt . TT-250-B .. 2-1/2 11-251-B . 2-1/2FAI .. 11-275-B 3/4 11-276-B 314 FAt .. 11-300-B 11-301-BFAI 11-325-B .. 3-1/4 . TI-350-B . 2 TT-375-B . 3-3/4 . TT-400-B 4 RetailApprox PriceWeight $1395058 02 149509502 1595180oz 169516002 189515002 189519002 209517002 229522002 249520002 2695260oz 289525002 369534002 499547002 5995520oz 699557002 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available Sizes Add $300 Per Spinner PROP NUT ADAPTORS Part No Size 11-140A . 1/4-28 T1-147A -28/7mm 11-610-A 6 x 10mm 11-710-A 10mm 11-516-A 5/16-24 11-518-A 5/16-24/8mm 11-810-A 8 x 10mm 11-825-A 8 x 125mm 11-375-A 3/8-24 11-125-A lOx 125mm Approx Weight 061 oz 061 oz 063 oz 0 82 oz 076 oz 076oz 076 oz 075 oz 117 oz 115 oz 3 Pieces Nut Washer Machined Bushing Add $350 Shipping Handling Prices subject change notice ROMCO MFG INC OX 836 SOUTH HOUSTON TEXAS 77587 713 943-1867 square-tip prop dummy nose same weight glide tested times bleachers local Indoor site square-tip prop consist ently showed approximately 15% longer en durance other types probably due its higher pitch lower blade area higher pitch has also appeared help climb reducing initial difficult-tomanage acceleration increasing length prop run small degree havent discovered method accurately determining prop gave P-30 higher climb prop nose block assembled standard way freewheel notch prop will work better last longer short outer end shaft bent first about 950 small bend radius pos sible Assemble bend hooked part last Assembly first five Sparrow Hawks lost thermals though conven tional pop-up-tail dethermalizer acti vated Two disappeared straight up taught us very light wing loading P-30 requires something reliable standard DT method have used last five ships variation system first used Ken Wer nicke locally may have invented George Xenakis works like DT fuse like Pecks 3/10-in-diameter lightweight fuse burns through #32 rubberband wing [ hold-down wing pops off re tained 12-lb-test monofilament fish ing line attached wing tip swivel tail end fuselage freewheel prop spinning wing re strain model during fall Using system Sparrow Hawk has never failed break out strongest thermal yet model has landed con crete runways prop nose breaking slight drawback method can difficult extricate model tree fishing line wrapped around branches solution simply cut line carry extra sup ply Dont try tie fishing line short piece Y16-diameter aluminum tubing squeezed pliers both easier adjust reliable short piece head end straight pin protrudes top wing centerline assemble wing body fishing line pulled tight tail over stab around pin out wing tip Monofilament line has sufficient stretch stay taut its proper length wing hold-down rub berband goes over line hold place during flight wing place check square body centerline Glue four keys made split halves 1A-in dowel onto wing will serve guides ensure accurate positioning reattaching wing Continued page 175 @cMlPL 8b 78 Model Aviation Retail Price S495 495 495 495 495 495 495 495 595 595 t1C IN SPIHHJ11 WELL---- YR GOT THE PLANE IN BUT WHERE ARE WE GONNR 0 -v /0 lizer braces 2/ x -in softwing TEs 1 x 1 x 4-in soft blocknose & tail blocks Other Wood l%2 x x 19-in hardwood stripflap & eleva tor joiners plywood approx 1 x 7 firewall landing gear bulkhead bellcrank mount 1A x x 13-in hardwoodmotor mounts Other Materials Plans Building board Straight pins Wax paper 1Cox Tee Dee 049 051 engine 1propeller 6 x 4 Cox plastic Top Flite Zinger wood 11-in plastic spinner Ace RC Inc 1-oz wedge fuel tank Perfect #20 /s x 4-in brats tubingtank vent extension leadout guides 2 small plastic flexible fuel line /16 x 28-in music wtrepushrods landing gear 032 x 4-in music wiretailskid 12-in bellcrank mounting hardware Perfect comparable 36-in length braided lead-out line Perfect com parable 1 pairflying wire clips Perfect Du-Bro com parable 1 pair1%-in-dia plastic wheels Sig comparable 1 pair/s-in wheel collars Perfect Du-Bro comparable 42-56 x -in engine mounting bolts locknuts 2small control horns Perfect comparable flaps elevator 4wire pushrod keepers /6-in-dia music wire 48% x -in similar size fabric control surface hinges Aliphatic resin glue Franklin Tite Bond compar able Five-minute epoxy glue Duro comparable Garnet paper 100- 200-grit Norton compa rable Wet-or-dry paper 400-grit 3M comparable 1 sheetlightweight silkspan Fuel-proof dopeSig clear sanding sealer Diana Cream Stearman Red comparable 1-in numerals AMA license number 1 set012-inx 35-ft braided steel flying wire Sul livan comparable 1A control handle Sullivan comparable Cox Super Power Glow Fuel above parts materials should available local hobby shop Theres word some streets supplies Con trol Line models arent available anymore weve found true able secure everything needed build Lil Bit other models Johnny Clemens Hobby Counter Dallas know other shops stock order Control Line supplies So dont accept Geewe cant get anymore cause its just true Control Line alive Sparrow Hawk/ODwyer Continued page 78 Sparrow Hawk flies best four strands 3/6-in rubber Ten grams FM Champion rubber will 78 80 long Wash off powder coats rubber soapy water Use following method tying rubber will never slip Tie single overhand knot close end possible Laying two ends adja cent other tie another overhand knot two strands Use liberal amounts Continued page 178 Finest Kits Youll Ever Buy Build TraIn-Air 20 Train-Air 40 Sport-Air 40 Bel-AIr 40 40 Hydro-Floats rsa eesy handling uperior serobetic modern looking sport exhibition biplane has filled 55, 6 75 lbs 148 185 207-4901M1 Wise & Uastereeu4ed 1 KIT FEATURES Polyester fiberglass fusalage cowling retractable landing 92 wingspan gear Foam cores wing stab Available major production variations F4F-3 -3A -4 FM-i FM-2 Semi-Kit Fusalage cowling foam cores wing stab canopy retractable landing gear plans$27500 Complete Kit Everything listed semi-kit plus wood parts hardware necessary complete kit including 1/64 plywood sheeting wings$45000 Deluxe Kit Complete kit fusalage preassembled $85000 wings stab presheeted control surfaces prebuilt Information Package $100 VISA/MasterCard accepted add $1500 sh pp ng daho es add 5% Sa es tax Classic Glass PO Box 503 Blackfoot Idaho 83221-0503 Mike Zamber 208 785-2309 November 1988 175 fine tine kits ate machine cut sasist building reel show 80 has fully summetricel wing sections gives gresteat potential serobstic er upflght Inverted ship cspsble very slow close-In type flight right up robatic schedule can muster Classic Glass Grumman Wildcat B limEd ATIIE BEST IN ELECTRIC FLIGHT SPECIALIZING IH ASTRO FLIBHT SYSTEM -ENflI 111 ___________________________________________________ 1 I -RRl i 5l 1j CS Flight SgsteNs 31 Perrj Street Hiddlebero M 023483117 Phone 617947-2905 6 9 P H Go . Fredy Glow PIL 15 volt saliva lubricate knot pulled very tight small knots acting limit stops Cut off excess Coat rubber good grade rub ber lube install body tube push stick adequate length rear rubber support tube retained small rubberband shown photo Put two small rubberbands front end body tube behind little trian gles bands serves backnp difficult replace mo tor wound Cut short piece DT fuse slide snuffer tube use pair tweezers hold back wing mount rubberband sure positioned designed modernDealer hnuerle ported engines Dealer Inquiries Invited S Part Cam*ea% Auos 9w against fuse once latter place against snuffer tube Check center-of-gravity prop installed should balance rear spar bot tom surface wing off either direction little lead tape needed light end course out-of-balance situation can avoided entirely waiting until time glue pylon onto body Check Sparrow Hawk over warps wing tail steam out neces sary plan use model competi tion put AMA number right panel name address some plane Im usually eager go fly write AMA number black marking pen use mail address stickers name Since lost P-30s have returned maybe should also mention reward address label Flying Wait calm day test fly Before flying session lubricate prop shaft thin oil such sewing machine oil type comes neat pen cil dispenser fits nicely toolbox Test glide shim trim rear stab support until obtain slowest possi ble glide stalling Using winder put about 200 turns motor use various holes notches flagged safety pin see pho tos obvious Light DT fuse another piece fuse Never use match cigarette lighter light fuse air plane nitrate dope tissue al explosive WILLIAMS ACCESSORIES BROTHERS 4 PILOTS STANDARD TSMAN 0 RACING TAR VINTAGE TH CONTOUR BALLOON EN AGE 178 Model Aviation 10 Sparrow Hawk/ODwyer Continued page 175 HI-TECH ENCODER microprocessor based encoder board designed replace encoder board Futaba Conquest Ace Silver Seven transmitters compatible other AM FM radios market FEATURES complete calibration system use trimpots stores calibration constants four aircraft maintained during power off can mix first five channels other first five channels variety configoratiom exponential trim five strengtlss mixing expo trim can turned off during flight contrul trun throttle cntoff dual-rates servo reversing outputs four eight channels POWER REQUIREMENTS 32ma @ 96vdc SIZE 3 x45 x 75 inches SEND $400 installation operation manual oaly $17500 completely assembled tested encoder installation operation manual Please stare transmitter nwdel number channels Add $500 shipping handling EMULATION ELECTRONICS 2206 S Lynn Urbana 1L61801 217-344-8740or217-4697647 PARABELLUM 1975 July first issue 1976 197701982 197801983 1979-9-4-9641980-9--4-9&5198101986 i0 0 0 i0 Enclose separate $2200 check set ordered NO CASH NO CHARGES I I I I I r Print carefully shipping label II II Name II Street Addresa HStateZIP II Make checks payable AMA Send orders Academy Model Aeronautics 1810 Samuel Morse Dr Reston VA 22090 Linrnrn. urn urn ml Launch model positioning slightly nose up little left wind thrust line angles adequate model should gently climb right spiral about 10 seconds glide large left circle use short DT fuse forewarned Sparrow Hawk could startle disassembling itself air coming straight down plane does climb 200 turns flies much faster glide speed downthrust should reduced flight speed slow theres no climb try find some peppier rubber speed up right turn tight very lit tle climb reduce right thrust try again 200 turns Always use DT fuse simplest test flight things look good gradually increase number turns 650 700 about 500 turns will encounter so-called knee-in-the-torque curve sharply rapid rise potential power output Its zone Scale sport fliers tend give up win contest have keep trimming model zooms near-vertical 50 ft drops off right center-of-gravity should moved aft elevator angle reduced correct glide Dont change thrust line plane flew well 200 turns entire books have written adjusting Free Flight models theres still no substitute lot practice litfie experimenting own great deal can learned small model like P-30 anxiety worry associ ated flying bigger expensive After crashing P-30 wouldnt such big deal hold back optimal glide remember freewheel prop way out front de stabilizing influence functions gyro Therefore slower glide less effect prop will have Ill see next contest bring Sparrow Hawk well both have win ners Good luck Reno/Berliner Continued page 92 next year 1973 saw quite few rec ords overturned Lyle Shelton Wright R-3350-powered Bearcat turned time trials record 427 mph finals record 428 mph Formula Falck set qualifier record 235 mph Cote won finals 231 mph Among small field Sport Biplanes new all-metal Sundancer flown Sid White recordsetting 194 mph time trials 195 mph finals AT-6 time trials winner Jim Mott 211 mph Bill Turnbull took finals 207 mph 1974 Lyle Shelton came through another time trials record 432 mph Un limited bowed Ken Burnstine 382 mph finals hot ones dropped out Formula Ray Cote also scored record speeds 240 mph Name Street Address city State Zip HOBg RNATIONAL iNc November 1988 179 Modelers aioice High Quality Convenient Size Modest Price Jr Kwik Set Epoxy 5 OL $695 Gas Model Products 8773 Russet Dr Cincinnati OH 45239 dealer call 513-385-7398 order direct add *1 50 postage AMA INATONAII CENTENFOR Collectors Notice Just released AMA Museum BACK ISSUES Model Aviation magazinesNEW original car tons sale YEAR SETS ONLY Check selections below send SEPARATE $2200 CHECK individual set Orders will filled first-come basis set request sold out check will returned being cashed Limited Quantities Sets Are Complete L VIA
Edition: Model Aviation - 1988/11
Page Numbers: 72, 73, 74, 75, 76, 77, 78, 175, 178, 179
Hawk P-30 class has become popular cate gories out door Free Flight modeling can join ranks design thats proven winner John ODwyer WHY YOU ASK another P-30 swer should dear competitors heart P-30 lives up hopes designed really winand win does Sparrow Hawk definitely outper forms breed has placed con test its competed yet airplane maintains relative simplicity belies its capabilities As retired aeronautical engineer relative newcomer Free Flight modeling looking challenging event start off After reading rules roughed out first P-30 built flew itor tried Heavy ugly model barely got airborne Clearly better way decided use some experience education design betterperforming P-30 point lets review AMA rules P-30 40-gram minimum weight probably important consideration 30-in maximum dimension no long skinny efficient high aspect ratio wings 10 grams rubber use effectively freewheel plastic prop between 905 984 in diameter Are plastic props alike Other challenges became apparent de velopment progressed will cov ered later thing 40 years experience de signing full-scale aircraft will make totally obvious excess weight invariably primary reason poor performance Hence want competitive model keeping weight down should number consideration achieve need scale Any scale such pos tal scale weight watchers scale will Best though good threebeam laboratory scale calibrated grams 72 Model Aviation Sparrow Above A lot research went making simple-looking airplane consistent contest winner has become Fortunately hard work has already done re mains construct per plans instructions article Below author young friend Sean Bridges wind up again another trip Texas skies Thus equipped can weigh several piec es balsawood pick lightestor discover two apparenfly identical plas tic props actually differ weight two grams Also scale allows check youre flying maximum legal weight rubber arent shortchang ing yourself have simple postal scale calibrated ounces ounce equals 2834 grams 1 oz little 40 grams /4 oz slightly less 10 grams Since wingspan limited 30 low aspect ratio low wing loading seem best An aspect ratio betwecn 61 71 indicated lower limit several rea sons including rapid rise induced drag structural stability wingspan being compromise can least compensate using best possible air foil Airfoil requirements small slow Left When fastening monofilament line swivel use piece aluminum tubing crimped over lines end instead trying tie knot will inevitably sup out Right other end monofilament line permanently attached models left wing tip November 1988 73 balsa sheet trimmed shape before its formed around broom handle make body tube four pieces right glued together make wing mounting pylon aft end bulkhead mini swivel Once wing pops off its pylon dethermaliz ing remains connected fuselage piece monofilament line tied swivel pylon glued body tube CyA Placed shown acts partial exter nal bulkhead strengthening bodys center Cut out middle pylon save weight rear edge pylon notched cen ter snuffer tube Dark band around tube 24-hr epoxy Use sparingly its heavy plane like differ greatly what full-size aircraft need airfoils spe cifically designed low-speed regime considered Much has written subject Among authoritative works published Dieter Althaus based studies low-speed tunnel Stuttgart Germany Using P-30 model flight speed 8 10 ft per sec mea sured test gliding bleachers local gym best airfoil size speed appeared Sokolov Russian Glider section exhibited very good lift/drag ratio 601 tar bulator Lift/drag ratio best index gliding efficiency Sokolov mea sured nearly 80% higher easy-touse flat-bottomed Clark Y airfoil shape author lost first five Sparrow Hawks usual pop-up stab OTing failed bring back down Popping wing off way almost always gets model out thermal brings safely back down Left A common straight pin holds DT line place wing center rubberband secured Once band place lift line over pinhead rubberband will hold place against sandpaper Right band wrapped around fuselage strengthen area rear motor peg small rubberband keeps hollow peg place after tension rubber motor gone Lett The two side notcnes nob inc satety pin piace wouna moipr untii prop can installed safety pin piaced inc nose block prevent prop turning nose plug holding bands other backup hooked DT fuse lit 74 Model Aviation DT line runs along upper surface wing under hold-down rubberband back along left side fin over stab swivel end body tube Full-Size Plans Available Page 186 Fuselage first rolled tube fu selage building can kind fun begin selecting correct wood ex tremely important Whats required very straight-grained 3 x 36 x sheet medium-lightweight balsa Sig has good balsa have also found Mid west balsa carried local hobby shop very even-grained light /32 sheet thin enough can held up light check uniformity grain Reject sheets dark streaks indi cate harder-grained wood may crack rolled 3-in-wide sheet 1/3 thickness will make tube roughly 1 in diameter Thats bigger wound P-30 motor can save weight using smaller dia meter Trim /16 edge sheet along its full length cut off end length 281/2 Again save weight taper rear half %-in diame ter Referring photo prepared sheet cut two % x 14-in triangles part flat sheet will become tail end Apply two coats undiluted dope inside surface fuselage allowing about two hours drying between coats will seal inside against rubber lu bricant add strength cause tube curl like magic wet Locate broom handle something comparable % in diameter will serve mandrel body tube formed After dope thoroughly dry curl tube soaking balsa hot water bathtub about 10 min utes couple wet washcloths will hold balsa underwater soaks Place sheet broom handle wrap Ace bandage gauze strips some stretchable cloth will al Continued page 76 0 2 L aft 00 O S 2 / 012 / NH] 21 4 II ft -JK S 00 21 t0 S H 7 Li 7 E B 21 hft aa 20 Ca ft 50T ft 6 00 N 0 ft 0 L i1 K 02F 2 K4z November 1988 75 5 id 00 4 lx 4 LI Four keys black areas made two pieces dowel have split halves keys place accurate wing location pylon assured time 12 2- B aI 21Ja 2 L5kK j~ low wet tube diy handle dow el should large enough straight edges tube quite touch course tapered edges farther apart never fear will deal topic later Carefully set whole thing aside allow dry about 24 hours Cut 7-in piece off end sheet cut cross grain four equal pieces shown photo glued together edges using cyano acrylate CyA make 1% x 12-in strip will formed wing mount py lon Among CyAs Ive best luck Goldbergs Super Jet mediumviscosity fast-setting glue Make wing mount pylon using two symmetrical airfoils shown plans way make accurate copy obtain good dark Xerox copy full-size drawing Lay Xerox copy face down appropriate balsa sheet using dry flatiron MonoKote iron press down backside neatly transfer image balsa twice have two ribs Glue two ribs gether small spar-like rectangles shown Roughiy center subassembly 12-in-long A2 sheet equal amounts above below glue nose Working gradually attach side around trailing edge using CyA cut off excess rear Rough shape upper lower surfaces leave plenty material sanding time basic fuselage tube should dry Remove bandage slide mandrel straight sec tion tube can easily squeezed gether carefully secured CyA Once straight portion glued aft taper can closed Always keeping weight savings mind take care use too much CyA / ply bands shown drawing added both inside outside nose latter being rear rubber post two bands made -in-wide strips /-in-thick plywood about 3 long Make sure outside grain running direction /2-in strips Soak bands hot water wrap around mandrel used main body tube Hold plywood bands place rubberbands until dry adhere CyA Shape pylon mounting body tube sanding 180-grit paper wrapped around either mandrel fu selage body itself Attach aluminum snuffer tube angle shown using slowdrying metal bond epoxy Since epoxy very heavy sure use enough form narrow band around tube Sand both fuselage body tube pylon smooth surface reduce weight ribs pylon may cut out somewhat reduce weight further Locate glue pylon 6% 7 nose body important seam tube positioned bottom centerline before pylon attached Cut out disc / plywood making diameter aft end body tube Drill /l6 hole center insert through end small fishing swiv el short piece pin will prevent its re moval Secure swivel clear fiveminute epoxy Glue disc shown aft end fuselage body tube rein forcing couple small strips silk nylon single wrap h-in-wide silk fiveminute epoxy will strengthen front end well After epoxy has set up front cut three hes forward edge purpose upper po sition nose plug two side notches keep winding safety pin turning during transition winding motor installing prop fm made directly separate plan view facing right since cambered left turn flat left side Before begin make Xerox copies fin tail ribs use pat terns transferring wood use flat piece ceiling panel material work surface making wings tails first spray light coat Scotch spray adhesive board stick sec tion appropriate plan board spray plan section light coat same adhesive Caution sure keep spray light Cover plan section sheet wax paper latter works much better anything have tried cement super glue epoxy will stick damage plan Afterwards wax paper peels off plan leaving slightly sticky day Once youve made fin sand lightly paint outer edges coat Aero Gloss Balsa Sanding Sealer Cut Japanese tissue following grain longest dimension fin Coat struc ture thick dope lay tissue stretching out wrinldes problem areas dampen lit tle thinner trailing edge fin intended long enough extend through body tube add strength attachment Line up fin vertical wing pylon flat side fin should par allel body centerline stabilizer rest glued body tube left side about degree high aid left turn glide Water shrink fin tissue brush coat very thin nitrate dope Finish painting two coats thin sanding sealer waterproof outside body tube pylon sanding lightly between coats Wing fairly standard construction techaiques followed few suggestions order Iron Xerox copy main wing rib piece A2 plywood white painted aluminum carefully cut file shape Use template cut out ribs Stack balsa ribs us ing two pieces scrap /6-sq balsa 76 Model Aviation ii 0 m 0 K I 1 0 -I ii 0 z z 0 I0 C C n 0 z 0 z C, 0 -u 0 -a m I m 0 Q C -I CD C, C 0 C, 1 0 U 0 0 01 0 LzU N 0 C S S. S. CA S. CA x oo x x oo mini 01 x oo x S. x U spar grooves Sand stack ribs uniform contour length Pin down trailing edge waxpaper-covered plan using some scrap piec es wood block up forward edge /32 46-sq rib jig strip located about ard trailing edge preparation assures accurate undercamber extremely important low-speed airfoil triangular dihedral checker used assure center ribs set proper angle prior gluing place completed half removed plans propped up correct dihedral gle glued together quite bit Super Jet CyA rather steep V di hedral V saves about 1 grams weight over polyhedral configuration Cover Japanese tissue grain running spanwise turbulator made model railroading HO gauge scale 2 x 4s wing finished free warps washin washout makes much easier check prior flying ses sion generous amount dihedral correct pylon height will lessen need intentional wing warps Stabilizer Construction straightforward Use lightweight wood can get away coat dope Ft Worth TX coat does job live near water may have use two coats Just keep light possible Note liffle notch trailing edge center mates short peg 1/16 dowel added point rear end body help keep stab line bottom peg also keeps stab hold-down rubber body pre vents interfering dethermal izer DT swivel Propeller assembly Only few plas tic props available suitable P-30 models common Japanese rounded-tip type come green blue silver-gray doesnt seem verifiable difference among some people claim silver ones better propellers 9%-in di ameter 7-in pitch weigh 68 71 grams Another prop style now imported Europe type has square tip has same 9%-in diameter rounded-tip type has 9-in nominal pitch weighs seven grams As far know props available yellow FAT Model Supply carries facsimile prop however gram heavier original fre quently out balance AMA rules illegal shave sand P-30 prop lighten balance comparative evaluation per formance type propeller three different nose block assemblies con structedone round-tip prop Continued page 78 IWiVG MFG Tigerskini4 WHAT DO YOU CALL THE BEST SHEETING MATERIAL FOR FOAM WING CORES Wing Mfg pioneered foam core wing construction early 60s have used everything tangowood 002 stainless steel sheeting last few years have using pressure laminates evolved R & 0 work Uncle Sam Tigurskins pre-finish high density posterboard material clear laminated plastic film top simply apply contact cement such Styro-Stick adhesive cores sheeting press sheeting Onto cores material pliable can easily wrap around leading edges Tigerskins CHECK THESE FEATURES Superior strength weight ratio Superior bond capability foam 001 per sq temperature stability Smooth high gloss finish Superior resistance nitro fuel Superior resistance weather Easy apply Low low cost 01/64 23 35 size Comes following colors Waco Red Polar White Insignia Blue Sun Yellow $495 PER SHEET // pk00417 ORDERING Send check money order required amount Add $395 shipping 1 6 sheets Add $749 shipping 7 12 sheets SEND TO Wing Mfg P0 Boa 33 Crystal Lake IL 60014 Illinois Residents add 6 1/20/0 sales tea Super Styro-Stick wing skin adhesive $598 16 oz Can Item #601 can does wing up 70 No eatra shipping cost ordered Tigerskins See Tigerakins Chicago Model & Hobby Show Booth 1735 SEND $350 FOR CATALOG November 1988 77 ORDERS SHIPPED DAY RECEIVED WARBIRD VIDEOS VHS OR BETA DUR 23RD YEAR R ANY TWO VIDEOS ONLY $7595 ANY 3 VIDEOS ONLY $19795 SPECIAL IMTRDD6TDRY OFFEALL IVIDEOS ONLY $19995 WARBIRD CHECKOUT VOL 1 Flying P-40 Warhawk Corsair Hellcat SB2-A Buccanneer Avenger NF 1325 Programs2 Hr Only $3995 WARBIRD CHECKOUT VOL II Flying P-38 Mitchell Bomber P-61 Black Widow Invader NF 1454 Programsi 00 Mm Only $3995 WARBIRD CHECKOUT VOL III Flying P-Si Mustang A-20 Bomber P-39 Introduction P-39 Advanced NF 1514 Programslb Mm Only $3995 CALL TOLL FREE CREDIT CARDS Li J Day Night California outside USA 213 827-8666 Shi pin Paid Continental US-Foreign add $500 0 California residents add 6 1/2% tax NFVIDEQ LIBRARY 2554 LINCOLN BLVD #568 MARINA DEL REY CA 90291 PRECISION MODEL PRODUCTS ZZ7jjJosM Made U S BARSTOCK ALUMINUM SPINNERS Part NoSize TT-150-B .1-112 TT-175-B .1-314 TT-200-B 11-225-B 14 11-226-B 2114 FAt . TT-250-B .. 2-1/2 11-251-B . 2-1/2FAI .. 11-275-B 3/4 11-276-B 314 FAt .. 11-300-B 11-301-BFAI 11-325-B .. 3-1/4 . TI-350-B . 2 TT-375-B . 3-3/4 . TT-400-B 4 RetailApprox PriceWeight $1395058 02 149509502 1595180oz 169516002 189515002 189519002 209517002 229522002 249520002 2695260oz 289525002 369534002 499547002 5995520oz 699557002 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available Sizes Add $300 Per Spinner PROP NUT ADAPTORS Part No Size 11-140A . 1/4-28 T1-147A -28/7mm 11-610-A 6 x 10mm 11-710-A 10mm 11-516-A 5/16-24 11-518-A 5/16-24/8mm 11-810-A 8 x 10mm 11-825-A 8 x 125mm 11-375-A 3/8-24 11-125-A lOx 125mm Approx Weight 061 oz 061 oz 063 oz 0 82 oz 076 oz 076oz 076 oz 075 oz 117 oz 115 oz 3 Pieces Nut Washer Machined Bushing Add $350 Shipping Handling Prices subject change notice ROMCO MFG INC OX 836 SOUTH HOUSTON TEXAS 77587 713 943-1867 square-tip prop dummy nose same weight glide tested times bleachers local Indoor site square-tip prop consist ently showed approximately 15% longer en durance other types probably due its higher pitch lower blade area higher pitch has also appeared help climb reducing initial difficult-tomanage acceleration increasing length prop run small degree havent discovered method accurately determining prop gave P-30 higher climb prop nose block assembled standard way freewheel notch prop will work better last longer short outer end shaft bent first about 950 small bend radius pos sible Assemble bend hooked part last Assembly first five Sparrow Hawks lost thermals though conven tional pop-up-tail dethermalizer acti vated Two disappeared straight up taught us very light wing loading P-30 requires something reliable standard DT method have used last five ships variation system first used Ken Wer nicke locally may have invented George Xenakis works like DT fuse like Pecks 3/10-in-diameter lightweight fuse burns through #32 rubberband wing [ hold-down wing pops off re tained 12-lb-test monofilament fish ing line attached wing tip swivel tail end fuselage freewheel prop spinning wing re strain model during fall Using system Sparrow Hawk has never failed break out strongest thermal yet model has landed con crete runways prop nose breaking slight drawback method can difficult extricate model tree fishing line wrapped around branches solution simply cut line carry extra sup ply Dont try tie fishing line short piece Y16-diameter aluminum tubing squeezed pliers both easier adjust reliable short piece head end straight pin protrudes top wing centerline assemble wing body fishing line pulled tight tail over stab around pin out wing tip Monofilament line has sufficient stretch stay taut its proper length wing hold-down rub berband goes over line hold place during flight wing place check square body centerline Glue four keys made split halves 1A-in dowel onto wing will serve guides ensure accurate positioning reattaching wing Continued page 175 @cMlPL 8b 78 Model Aviation Retail Price S495 495 495 495 495 495 495 495 595 595 t1C IN SPIHHJ11 WELL---- YR GOT THE PLANE IN BUT WHERE ARE WE GONNR 0 -v /0 lizer braces 2/ x -in softwing TEs 1 x 1 x 4-in soft blocknose & tail blocks Other Wood l%2 x x 19-in hardwood stripflap & eleva tor joiners plywood approx 1 x 7 firewall landing gear bulkhead bellcrank mount 1A x x 13-in hardwoodmotor mounts Other Materials Plans Building board Straight pins Wax paper 1Cox Tee Dee 049 051 engine 1propeller 6 x 4 Cox plastic Top Flite Zinger wood 11-in plastic spinner Ace RC Inc 1-oz wedge fuel tank Perfect #20 /s x 4-in brats tubingtank vent extension leadout guides 2 small plastic flexible fuel line /16 x 28-in music wtrepushrods landing gear 032 x 4-in music wiretailskid 12-in bellcrank mounting hardware Perfect comparable 36-in length braided lead-out line Perfect com parable 1 pairflying wire clips Perfect Du-Bro com parable 1 pair1%-in-dia plastic wheels Sig comparable 1 pair/s-in wheel collars Perfect Du-Bro comparable 42-56 x -in engine mounting bolts locknuts 2small control horns Perfect comparable flaps elevator 4wire pushrod keepers /6-in-dia music wire 48% x -in similar size fabric control surface hinges Aliphatic resin glue Franklin Tite Bond compar able Five-minute epoxy glue Duro comparable Garnet paper 100- 200-grit Norton compa rable Wet-or-dry paper 400-grit 3M comparable 1 sheetlightweight silkspan Fuel-proof dopeSig clear sanding sealer Diana Cream Stearman Red comparable 1-in numerals AMA license number 1 set012-inx 35-ft braided steel flying wire Sul livan comparable 1A control handle Sullivan comparable Cox Super Power Glow Fuel above parts materials should available local hobby shop Theres word some streets supplies Con trol Line models arent available anymore weve found true able secure everything needed build Lil Bit other models Johnny Clemens Hobby Counter Dallas know other shops stock order Control Line supplies So dont accept Geewe cant get anymore cause its just true Control Line alive Sparrow Hawk/ODwyer Continued page 78 Sparrow Hawk flies best four strands 3/6-in rubber Ten grams FM Champion rubber will 78 80 long Wash off powder coats rubber soapy water Use following method tying rubber will never slip Tie single overhand knot close end possible Laying two ends adja cent other tie another overhand knot two strands Use liberal amounts Continued page 178 Finest Kits Youll Ever Buy Build TraIn-Air 20 Train-Air 40 Sport-Air 40 Bel-AIr 40 40 Hydro-Floats rsa eesy handling uperior serobetic modern looking sport exhibition biplane has filled 55, 6 75 lbs 148 185 207-4901M1 Wise & Uastereeu4ed 1 KIT FEATURES Polyester fiberglass fusalage cowling retractable landing 92 wingspan gear Foam cores wing stab Available major production variations F4F-3 -3A -4 FM-i FM-2 Semi-Kit Fusalage cowling foam cores wing stab canopy retractable landing gear plans$27500 Complete Kit Everything listed semi-kit plus wood parts hardware necessary complete kit including 1/64 plywood sheeting wings$45000 Deluxe Kit Complete kit fusalage preassembled $85000 wings stab presheeted control surfaces prebuilt Information Package $100 VISA/MasterCard accepted add $1500 sh pp ng daho es add 5% Sa es tax Classic Glass PO Box 503 Blackfoot Idaho 83221-0503 Mike Zamber 208 785-2309 November 1988 175 fine tine kits ate machine cut sasist building reel show 80 has fully summetricel wing sections gives gresteat potential serobstic er upflght Inverted ship cspsble very slow close-In type flight right up robatic schedule can muster Classic Glass Grumman Wildcat B limEd ATIIE BEST IN ELECTRIC FLIGHT SPECIALIZING IH ASTRO FLIBHT SYSTEM -ENflI 111 ___________________________________________________ 1 I -RRl i 5l 1j CS Flight SgsteNs 31 Perrj Street Hiddlebero M 023483117 Phone 617947-2905 6 9 P H Go . Fredy Glow PIL 15 volt saliva lubricate knot pulled very tight small knots acting limit stops Cut off excess Coat rubber good grade rub ber lube install body tube push stick adequate length rear rubber support tube retained small rubberband shown photo Put two small rubberbands front end body tube behind little trian gles bands serves backnp difficult replace mo tor wound Cut short piece DT fuse slide snuffer tube use pair tweezers hold back wing mount rubberband sure positioned designed modernDealer hnuerle ported engines Dealer Inquiries Invited S Part Cam*ea% Auos 9w against fuse once latter place against snuffer tube Check center-of-gravity prop installed should balance rear spar bot tom surface wing off either direction little lead tape needed light end course out-of-balance situation can avoided entirely waiting until time glue pylon onto body Check Sparrow Hawk over warps wing tail steam out neces sary plan use model competi tion put AMA number right panel name address some plane Im usually eager go fly write AMA number black marking pen use mail address stickers name Since lost P-30s have returned maybe should also mention reward address label Flying Wait calm day test fly Before flying session lubricate prop shaft thin oil such sewing machine oil type comes neat pen cil dispenser fits nicely toolbox Test glide shim trim rear stab support until obtain slowest possi ble glide stalling Using winder put about 200 turns motor use various holes notches flagged safety pin see pho tos obvious Light DT fuse another piece fuse Never use match cigarette lighter light fuse air plane nitrate dope tissue al explosive WILLIAMS ACCESSORIES BROTHERS 4 PILOTS STANDARD TSMAN 0 RACING TAR VINTAGE TH CONTOUR BALLOON EN AGE 178 Model Aviation 10 Sparrow Hawk/ODwyer Continued page 175 HI-TECH ENCODER microprocessor based encoder board designed replace encoder board Futaba Conquest Ace Silver Seven transmitters compatible other AM FM radios market FEATURES complete calibration system use trimpots stores calibration constants four aircraft maintained during power off can mix first five channels other first five channels variety configoratiom exponential trim five strengtlss mixing expo trim can turned off during flight contrul trun throttle cntoff dual-rates servo reversing outputs four eight channels POWER REQUIREMENTS 32ma @ 96vdc SIZE 3 x45 x 75 inches SEND $400 installation operation manual oaly $17500 completely assembled tested encoder installation operation manual Please stare transmitter nwdel number channels Add $500 shipping handling EMULATION ELECTRONICS 2206 S Lynn Urbana 1L61801 217-344-8740or217-4697647 PARABELLUM 1975 July first issue 1976 197701982 197801983 1979-9-4-9641980-9--4-9&5198101986 i0 0 0 i0 Enclose separate $2200 check set ordered NO CASH NO CHARGES I I I I I r Print carefully shipping label II II Name II Street Addresa HStateZIP II Make checks payable AMA Send orders Academy Model Aeronautics 1810 Samuel Morse Dr Reston VA 22090 Linrnrn. urn urn ml Launch model positioning slightly nose up little left wind thrust line angles adequate model should gently climb right spiral about 10 seconds glide large left circle use short DT fuse forewarned Sparrow Hawk could startle disassembling itself air coming straight down plane does climb 200 turns flies much faster glide speed downthrust should reduced flight speed slow theres no climb try find some peppier rubber speed up right turn tight very lit tle climb reduce right thrust try again 200 turns Always use DT fuse simplest test flight things look good gradually increase number turns 650 700 about 500 turns will encounter so-called knee-in-the-torque curve sharply rapid rise potential power output Its zone Scale sport fliers tend give up win contest have keep trimming model zooms near-vertical 50 ft drops off right center-of-gravity should moved aft elevator angle reduced correct glide Dont change thrust line plane flew well 200 turns entire books have written adjusting Free Flight models theres still no substitute lot practice litfie experimenting own great deal can learned small model like P-30 anxiety worry associ ated flying bigger expensive After crashing P-30 wouldnt such big deal hold back optimal glide remember freewheel prop way out front de stabilizing influence functions gyro Therefore slower glide less effect prop will have Ill see next contest bring Sparrow Hawk well both have win ners Good luck Reno/Berliner Continued page 92 next year 1973 saw quite few rec ords overturned Lyle Shelton Wright R-3350-powered Bearcat turned time trials record 427 mph finals record 428 mph Formula Falck set qualifier record 235 mph Cote won finals 231 mph Among small field Sport Biplanes new all-metal Sundancer flown Sid White recordsetting 194 mph time trials 195 mph finals AT-6 time trials winner Jim Mott 211 mph Bill Turnbull took finals 207 mph 1974 Lyle Shelton came through another time trials record 432 mph Un limited bowed Ken Burnstine 382 mph finals hot ones dropped out Formula Ray Cote also scored record speeds 240 mph Name Street Address city State Zip HOBg RNATIONAL iNc November 1988 179 Modelers aioice High Quality Convenient Size Modest Price Jr Kwik Set Epoxy 5 OL $695 Gas Model Products 8773 Russet Dr Cincinnati OH 45239 dealer call 513-385-7398 order direct add *1 50 postage AMA INATONAII CENTENFOR Collectors Notice Just released AMA Museum BACK ISSUES Model Aviation magazinesNEW original car tons sale YEAR SETS ONLY Check selections below send SEPARATE $2200 CHECK individual set Orders will filled first-come basis set request sold out check will returned being cashed Limited Quantities Sets Are Complete L VIA
Edition: Model Aviation - 1988/11
Page Numbers: 72, 73, 74, 75, 76, 77, 78, 175, 178, 179
Hawk P-30 class has become popular cate gories out door Free Flight modeling can join ranks design thats proven winner John ODwyer WHY YOU ASK another P-30 swer should dear competitors heart P-30 lives up hopes designed really winand win does Sparrow Hawk definitely outper forms breed has placed con test its competed yet airplane maintains relative simplicity belies its capabilities As retired aeronautical engineer relative newcomer Free Flight modeling looking challenging event start off After reading rules roughed out first P-30 built flew itor tried Heavy ugly model barely got airborne Clearly better way decided use some experience education design betterperforming P-30 point lets review AMA rules P-30 40-gram minimum weight probably important consideration 30-in maximum dimension no long skinny efficient high aspect ratio wings 10 grams rubber use effectively freewheel plastic prop between 905 984 in diameter Are plastic props alike Other challenges became apparent de velopment progressed will cov ered later thing 40 years experience de signing full-scale aircraft will make totally obvious excess weight invariably primary reason poor performance Hence want competitive model keeping weight down should number consideration achieve need scale Any scale such pos tal scale weight watchers scale will Best though good threebeam laboratory scale calibrated grams 72 Model Aviation Sparrow Above A lot research went making simple-looking airplane consistent contest winner has become Fortunately hard work has already done re mains construct per plans instructions article Below author young friend Sean Bridges wind up again another trip Texas skies Thus equipped can weigh several piec es balsawood pick lightestor discover two apparenfly identical plas tic props actually differ weight two grams Also scale allows check youre flying maximum legal weight rubber arent shortchang ing yourself have simple postal scale calibrated ounces ounce equals 2834 grams 1 oz little 40 grams /4 oz slightly less 10 grams Since wingspan limited 30 low aspect ratio low wing loading seem best An aspect ratio betwecn 61 71 indicated lower limit several rea sons including rapid rise induced drag structural stability wingspan being compromise can least compensate using best possible air foil Airfoil requirements small slow Left When fastening monofilament line swivel use piece aluminum tubing crimped over lines end instead trying tie knot will inevitably sup out Right other end monofilament line permanently attached models left wing tip November 1988 73 balsa sheet trimmed shape before its formed around broom handle make body tube four pieces right glued together make wing mounting pylon aft end bulkhead mini swivel Once wing pops off its pylon dethermaliz ing remains connected fuselage piece monofilament line tied swivel pylon glued body tube CyA Placed shown acts partial exter nal bulkhead strengthening bodys center Cut out middle pylon save weight rear edge pylon notched cen ter snuffer tube Dark band around tube 24-hr epoxy Use sparingly its heavy plane like differ greatly what full-size aircraft need airfoils spe cifically designed low-speed regime considered Much has written subject Among authoritative works published Dieter Althaus based studies low-speed tunnel Stuttgart Germany Using P-30 model flight speed 8 10 ft per sec mea sured test gliding bleachers local gym best airfoil size speed appeared Sokolov Russian Glider section exhibited very good lift/drag ratio 601 tar bulator Lift/drag ratio best index gliding efficiency Sokolov mea sured nearly 80% higher easy-touse flat-bottomed Clark Y airfoil shape author lost first five Sparrow Hawks usual pop-up stab OTing failed bring back down Popping wing off way almost always gets model out thermal brings safely back down Left A common straight pin holds DT line place wing center rubberband secured Once band place lift line over pinhead rubberband will hold place against sandpaper Right band wrapped around fuselage strengthen area rear motor peg small rubberband keeps hollow peg place after tension rubber motor gone Lett The two side notcnes nob inc satety pin piace wouna moipr untii prop can installed safety pin piaced inc nose block prevent prop turning nose plug holding bands other backup hooked DT fuse lit 74 Model Aviation DT line runs along upper surface wing under hold-down rubberband back along left side fin over stab swivel end body tube Full-Size Plans Available Page 186 Fuselage first rolled tube fu selage building can kind fun begin selecting correct wood ex tremely important Whats required very straight-grained 3 x 36 x sheet medium-lightweight balsa Sig has good balsa have also found Mid west balsa carried local hobby shop very even-grained light /32 sheet thin enough can held up light check uniformity grain Reject sheets dark streaks indi cate harder-grained wood may crack rolled 3-in-wide sheet 1/3 thickness will make tube roughly 1 in diameter Thats bigger wound P-30 motor can save weight using smaller dia meter Trim /16 edge sheet along its full length cut off end length 281/2 Again save weight taper rear half %-in diame ter Referring photo prepared sheet cut two % x 14-in triangles part flat sheet will become tail end Apply two coats undiluted dope inside surface fuselage allowing about two hours drying between coats will seal inside against rubber lu bricant add strength cause tube curl like magic wet Locate broom handle something comparable % in diameter will serve mandrel body tube formed After dope thoroughly dry curl tube soaking balsa hot water bathtub about 10 min utes couple wet washcloths will hold balsa underwater soaks Place sheet broom handle wrap Ace bandage gauze strips some stretchable cloth will al Continued page 76 0 2 L aft 00 O S 2 / 012 / NH] 21 4 II ft -JK S 00 21 t0 S H 7 Li 7 E B 21 hft aa 20 Ca ft 50T ft 6 00 N 0 ft 0 L i1 K 02F 2 K4z November 1988 75 5 id 00 4 lx 4 LI Four keys black areas made two pieces dowel have split halves keys place accurate wing location pylon assured time 12 2- B aI 21Ja 2 L5kK j~ low wet tube diy handle dow el should large enough straight edges tube quite touch course tapered edges farther apart never fear will deal topic later Carefully set whole thing aside allow dry about 24 hours Cut 7-in piece off end sheet cut cross grain four equal pieces shown photo glued together edges using cyano acrylate CyA make 1% x 12-in strip will formed wing mount py lon Among CyAs Ive best luck Goldbergs Super Jet mediumviscosity fast-setting glue Make wing mount pylon using two symmetrical airfoils shown plans way make accurate copy obtain good dark Xerox copy full-size drawing Lay Xerox copy face down appropriate balsa sheet using dry flatiron MonoKote iron press down backside neatly transfer image balsa twice have two ribs Glue two ribs gether small spar-like rectangles shown Roughiy center subassembly 12-in-long A2 sheet equal amounts above below glue nose Working gradually attach side around trailing edge using CyA cut off excess rear Rough shape upper lower surfaces leave plenty material sanding time basic fuselage tube should dry Remove bandage slide mandrel straight sec tion tube can easily squeezed gether carefully secured CyA Once straight portion glued aft taper can closed Always keeping weight savings mind take care use too much CyA / ply bands shown drawing added both inside outside nose latter being rear rubber post two bands made -in-wide strips /-in-thick plywood about 3 long Make sure outside grain running direction /2-in strips Soak bands hot water wrap around mandrel used main body tube Hold plywood bands place rubberbands until dry adhere CyA Shape pylon mounting body tube sanding 180-grit paper wrapped around either mandrel fu selage body itself Attach aluminum snuffer tube angle shown using slowdrying metal bond epoxy Since epoxy very heavy sure use enough form narrow band around tube Sand both fuselage body tube pylon smooth surface reduce weight ribs pylon may cut out somewhat reduce weight further Locate glue pylon 6% 7 nose body important seam tube positioned bottom centerline before pylon attached Cut out disc / plywood making diameter aft end body tube Drill /l6 hole center insert through end small fishing swiv el short piece pin will prevent its re moval Secure swivel clear fiveminute epoxy Glue disc shown aft end fuselage body tube rein forcing couple small strips silk nylon single wrap h-in-wide silk fiveminute epoxy will strengthen front end well After epoxy has set up front cut three hes forward edge purpose upper po sition nose plug two side notches keep winding safety pin turning during transition winding motor installing prop fm made directly separate plan view facing right since cambered left turn flat left side Before begin make Xerox copies fin tail ribs use pat terns transferring wood use flat piece ceiling panel material work surface making wings tails first spray light coat Scotch spray adhesive board stick sec tion appropriate plan board spray plan section light coat same adhesive Caution sure keep spray light Cover plan section sheet wax paper latter works much better anything have tried cement super glue epoxy will stick damage plan Afterwards wax paper peels off plan leaving slightly sticky day Once youve made fin sand lightly paint outer edges coat Aero Gloss Balsa Sanding Sealer Cut Japanese tissue following grain longest dimension fin Coat struc ture thick dope lay tissue stretching out wrinldes problem areas dampen lit tle thinner trailing edge fin intended long enough extend through body tube add strength attachment Line up fin vertical wing pylon flat side fin should par allel body centerline stabilizer rest glued body tube left side about degree high aid left turn glide Water shrink fin tissue brush coat very thin nitrate dope Finish painting two coats thin sanding sealer waterproof outside body tube pylon sanding lightly between coats Wing fairly standard construction techaiques followed few suggestions order Iron Xerox copy main wing rib piece A2 plywood white painted aluminum carefully cut file shape Use template cut out ribs Stack balsa ribs us ing two pieces scrap /6-sq balsa 76 Model Aviation ii 0 m 0 K I 1 0 -I ii 0 z z 0 I0 C C n 0 z 0 z C, 0 -u 0 -a m I m 0 Q C -I CD C, C 0 C, 1 0 U 0 0 01 0 LzU N 0 C S S. S. CA S. CA x oo x x oo mini 01 x oo x S. x U spar grooves Sand stack ribs uniform contour length Pin down trailing edge waxpaper-covered plan using some scrap piec es wood block up forward edge /32 46-sq rib jig strip located about ard trailing edge preparation assures accurate undercamber extremely important low-speed airfoil triangular dihedral checker used assure center ribs set proper angle prior gluing place completed half removed plans propped up correct dihedral gle glued together quite bit Super Jet CyA rather steep V di hedral V saves about 1 grams weight over polyhedral configuration Cover Japanese tissue grain running spanwise turbulator made model railroading HO gauge scale 2 x 4s wing finished free warps washin washout makes much easier check prior flying ses sion generous amount dihedral correct pylon height will lessen need intentional wing warps Stabilizer Construction straightforward Use lightweight wood can get away coat dope Ft Worth TX coat does job live near water may have use two coats Just keep light possible Note liffle notch trailing edge center mates short peg 1/16 dowel added point rear end body help keep stab line bottom peg also keeps stab hold-down rubber body pre vents interfering dethermal izer DT swivel Propeller assembly Only few plas tic props available suitable P-30 models common Japanese rounded-tip type come green blue silver-gray doesnt seem verifiable difference among some people claim silver ones better propellers 9%-in di ameter 7-in pitch weigh 68 71 grams Another prop style now imported Europe type has square tip has same 9%-in diameter rounded-tip type has 9-in nominal pitch weighs seven grams As far know props available yellow FAT Model Supply carries facsimile prop however gram heavier original fre quently out balance AMA rules illegal shave sand P-30 prop lighten balance comparative evaluation per formance type propeller three different nose block assemblies con structedone round-tip prop Continued page 78 IWiVG MFG Tigerskini4 WHAT DO YOU CALL THE BEST SHEETING MATERIAL FOR FOAM WING CORES Wing Mfg pioneered foam core wing construction early 60s have used everything tangowood 002 stainless steel sheeting last few years have using pressure laminates evolved R & 0 work Uncle Sam Tigurskins pre-finish high density posterboard material clear laminated plastic film top simply apply contact cement such Styro-Stick adhesive cores sheeting press sheeting Onto cores material pliable can easily wrap around leading edges Tigerskins CHECK THESE FEATURES Superior strength weight ratio Superior bond capability foam 001 per sq temperature stability Smooth high gloss finish Superior resistance nitro fuel Superior resistance weather Easy apply Low low cost 01/64 23 35 size Comes following colors Waco Red Polar White Insignia Blue Sun Yellow $495 PER SHEET // pk00417 ORDERING Send check money order required amount Add $395 shipping 1 6 sheets Add $749 shipping 7 12 sheets SEND TO Wing Mfg P0 Boa 33 Crystal Lake IL 60014 Illinois Residents add 6 1/20/0 sales tea Super Styro-Stick wing skin adhesive $598 16 oz Can Item #601 can does wing up 70 No eatra shipping cost ordered Tigerskins See Tigerakins Chicago Model & Hobby Show Booth 1735 SEND $350 FOR CATALOG November 1988 77 ORDERS SHIPPED DAY RECEIVED WARBIRD VIDEOS VHS OR BETA DUR 23RD YEAR R ANY TWO VIDEOS ONLY $7595 ANY 3 VIDEOS ONLY $19795 SPECIAL IMTRDD6TDRY OFFEALL IVIDEOS ONLY $19995 WARBIRD CHECKOUT VOL 1 Flying P-40 Warhawk Corsair Hellcat SB2-A Buccanneer Avenger NF 1325 Programs2 Hr Only $3995 WARBIRD CHECKOUT VOL II Flying P-38 Mitchell Bomber P-61 Black Widow Invader NF 1454 Programsi 00 Mm Only $3995 WARBIRD CHECKOUT VOL III Flying P-Si Mustang A-20 Bomber P-39 Introduction P-39 Advanced NF 1514 Programslb Mm Only $3995 CALL TOLL FREE CREDIT CARDS Li J Day Night California outside USA 213 827-8666 Shi pin Paid Continental US-Foreign add $500 0 California residents add 6 1/2% tax NFVIDEQ LIBRARY 2554 LINCOLN BLVD #568 MARINA DEL REY CA 90291 PRECISION MODEL PRODUCTS ZZ7jjJosM Made U S BARSTOCK ALUMINUM SPINNERS Part NoSize TT-150-B .1-112 TT-175-B .1-314 TT-200-B 11-225-B 14 11-226-B 2114 FAt . TT-250-B .. 2-1/2 11-251-B . 2-1/2FAI .. 11-275-B 3/4 11-276-B 314 FAt .. 11-300-B 11-301-BFAI 11-325-B .. 3-1/4 . TI-350-B . 2 TT-375-B . 3-3/4 . TT-400-B 4 RetailApprox PriceWeight $1395058 02 149509502 1595180oz 169516002 189515002 189519002 209517002 229522002 249520002 2695260oz 289525002 369534002 499547002 5995520oz 699557002 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available Sizes Add $300 Per Spinner PROP NUT ADAPTORS Part No Size 11-140A . 1/4-28 T1-147A -28/7mm 11-610-A 6 x 10mm 11-710-A 10mm 11-516-A 5/16-24 11-518-A 5/16-24/8mm 11-810-A 8 x 10mm 11-825-A 8 x 125mm 11-375-A 3/8-24 11-125-A lOx 125mm Approx Weight 061 oz 061 oz 063 oz 0 82 oz 076 oz 076oz 076 oz 075 oz 117 oz 115 oz 3 Pieces Nut Washer Machined Bushing Add $350 Shipping Handling Prices subject change notice ROMCO MFG INC OX 836 SOUTH HOUSTON TEXAS 77587 713 943-1867 square-tip prop dummy nose same weight glide tested times bleachers local Indoor site square-tip prop consist ently showed approximately 15% longer en durance other types probably due its higher pitch lower blade area higher pitch has also appeared help climb reducing initial difficult-tomanage acceleration increasing length prop run small degree havent discovered method accurately determining prop gave P-30 higher climb prop nose block assembled standard way freewheel notch prop will work better last longer short outer end shaft bent first about 950 small bend radius pos sible Assemble bend hooked part last Assembly first five Sparrow Hawks lost thermals though conven tional pop-up-tail dethermalizer acti vated Two disappeared straight up taught us very light wing loading P-30 requires something reliable standard DT method have used last five ships variation system first used Ken Wer nicke locally may have invented George Xenakis works like DT fuse like Pecks 3/10-in-diameter lightweight fuse burns through #32 rubberband wing [ hold-down wing pops off re tained 12-lb-test monofilament fish ing line attached wing tip swivel tail end fuselage freewheel prop spinning wing re strain model during fall Using system Sparrow Hawk has never failed break out strongest thermal yet model has landed con crete runways prop nose breaking slight drawback method can difficult extricate model tree fishing line wrapped around branches solution simply cut line carry extra sup ply Dont try tie fishing line short piece Y16-diameter aluminum tubing squeezed pliers both easier adjust reliable short piece head end straight pin protrudes top wing centerline assemble wing body fishing line pulled tight tail over stab around pin out wing tip Monofilament line has sufficient stretch stay taut its proper length wing hold-down rub berband goes over line hold place during flight wing place check square body centerline Glue four keys made split halves 1A-in dowel onto wing will serve guides ensure accurate positioning reattaching wing Continued page 175 @cMlPL 8b 78 Model Aviation Retail Price S495 495 495 495 495 495 495 495 595 595 t1C IN SPIHHJ11 WELL---- YR GOT THE PLANE IN BUT WHERE ARE WE GONNR 0 -v /0 lizer braces 2/ x -in softwing TEs 1 x 1 x 4-in soft blocknose & tail blocks Other Wood l%2 x x 19-in hardwood stripflap & eleva tor joiners plywood approx 1 x 7 firewall landing gear bulkhead bellcrank mount 1A x x 13-in hardwoodmotor mounts Other Materials Plans Building board Straight pins Wax paper 1Cox Tee Dee 049 051 engine 1propeller 6 x 4 Cox plastic Top Flite Zinger wood 11-in plastic spinner Ace RC Inc 1-oz wedge fuel tank Perfect #20 /s x 4-in brats tubingtank vent extension leadout guides 2 small plastic flexible fuel line /16 x 28-in music wtrepushrods landing gear 032 x 4-in music wiretailskid 12-in bellcrank mounting hardware Perfect comparable 36-in length braided lead-out line Perfect com parable 1 pairflying wire clips Perfect Du-Bro com parable 1 pair1%-in-dia plastic wheels Sig comparable 1 pair/s-in wheel collars Perfect Du-Bro comparable 42-56 x -in engine mounting bolts locknuts 2small control horns Perfect comparable flaps elevator 4wire pushrod keepers /6-in-dia music wire 48% x -in similar size fabric control surface hinges Aliphatic resin glue Franklin Tite Bond compar able Five-minute epoxy glue Duro comparable Garnet paper 100- 200-grit Norton compa rable Wet-or-dry paper 400-grit 3M comparable 1 sheetlightweight silkspan Fuel-proof dopeSig clear sanding sealer Diana Cream Stearman Red comparable 1-in numerals AMA license number 1 set012-inx 35-ft braided steel flying wire Sul livan comparable 1A control handle Sullivan comparable Cox Super Power Glow Fuel above parts materials should available local hobby shop Theres word some streets supplies Con trol Line models arent available anymore weve found true able secure everything needed build Lil Bit other models Johnny Clemens Hobby Counter Dallas know other shops stock order Control Line supplies So dont accept Geewe cant get anymore cause its just true Control Line alive Sparrow Hawk/ODwyer Continued page 78 Sparrow Hawk flies best four strands 3/6-in rubber Ten grams FM Champion rubber will 78 80 long Wash off powder coats rubber soapy water Use following method tying rubber will never slip Tie single overhand knot close end possible Laying two ends adja cent other tie another overhand knot two strands Use liberal amounts Continued page 178 Finest Kits Youll Ever Buy Build TraIn-Air 20 Train-Air 40 Sport-Air 40 Bel-AIr 40 40 Hydro-Floats rsa eesy handling uperior serobetic modern looking sport exhibition biplane has filled 55, 6 75 lbs 148 185 207-4901M1 Wise & Uastereeu4ed 1 KIT FEATURES Polyester fiberglass fusalage cowling retractable landing 92 wingspan gear Foam cores wing stab Available major production variations F4F-3 -3A -4 FM-i FM-2 Semi-Kit Fusalage cowling foam cores wing stab canopy retractable landing gear plans$27500 Complete Kit Everything listed semi-kit plus wood parts hardware necessary complete kit including 1/64 plywood sheeting wings$45000 Deluxe Kit Complete kit fusalage preassembled $85000 wings stab presheeted control surfaces prebuilt Information Package $100 VISA/MasterCard accepted add $1500 sh pp ng daho es add 5% Sa es tax Classic Glass PO Box 503 Blackfoot Idaho 83221-0503 Mike Zamber 208 785-2309 November 1988 175 fine tine kits ate machine cut sasist building reel show 80 has fully summetricel wing sections gives gresteat potential serobstic er upflght Inverted ship cspsble very slow close-In type flight right up robatic schedule can muster Classic Glass Grumman Wildcat B limEd ATIIE BEST IN ELECTRIC FLIGHT SPECIALIZING IH ASTRO FLIBHT SYSTEM -ENflI 111 ___________________________________________________ 1 I -RRl i 5l 1j CS Flight SgsteNs 31 Perrj Street Hiddlebero M 023483117 Phone 617947-2905 6 9 P H Go . Fredy Glow PIL 15 volt saliva lubricate knot pulled very tight small knots acting limit stops Cut off excess Coat rubber good grade rub ber lube install body tube push stick adequate length rear rubber support tube retained small rubberband shown photo Put two small rubberbands front end body tube behind little trian gles bands serves backnp difficult replace mo tor wound Cut short piece DT fuse slide snuffer tube use pair tweezers hold back wing mount rubberband sure positioned designed modernDealer hnuerle ported engines Dealer Inquiries Invited S Part Cam*ea% Auos 9w against fuse once latter place against snuffer tube Check center-of-gravity prop installed should balance rear spar bot tom surface wing off either direction little lead tape needed light end course out-of-balance situation can avoided entirely waiting until time glue pylon onto body Check Sparrow Hawk over warps wing tail steam out neces sary plan use model competi tion put AMA number right panel name address some plane Im usually eager go fly write AMA number black marking pen use mail address stickers name Since lost P-30s have returned maybe should also mention reward address label Flying Wait calm day test fly Before flying session lubricate prop shaft thin oil such sewing machine oil type comes neat pen cil dispenser fits nicely toolbox Test glide shim trim rear stab support until obtain slowest possi ble glide stalling Using winder put about 200 turns motor use various holes notches flagged safety pin see pho tos obvious Light DT fuse another piece fuse Never use match cigarette lighter light fuse air plane nitrate dope tissue al explosive WILLIAMS ACCESSORIES BROTHERS 4 PILOTS STANDARD TSMAN 0 RACING TAR VINTAGE TH CONTOUR BALLOON EN AGE 178 Model Aviation 10 Sparrow Hawk/ODwyer Continued page 175 HI-TECH ENCODER microprocessor based encoder board designed replace encoder board Futaba Conquest Ace Silver Seven transmitters compatible other AM FM radios market FEATURES complete calibration system use trimpots stores calibration constants four aircraft maintained during power off can mix first five channels other first five channels variety configoratiom exponential trim five strengtlss mixing expo trim can turned off during flight contrul trun throttle cntoff dual-rates servo reversing outputs four eight channels POWER REQUIREMENTS 32ma @ 96vdc SIZE 3 x45 x 75 inches SEND $400 installation operation manual oaly $17500 completely assembled tested encoder installation operation manual Please stare transmitter nwdel number channels Add $500 shipping handling EMULATION ELECTRONICS 2206 S Lynn Urbana 1L61801 217-344-8740or217-4697647 PARABELLUM 1975 July first issue 1976 197701982 197801983 1979-9-4-9641980-9--4-9&5198101986 i0 0 0 i0 Enclose separate $2200 check set ordered NO CASH NO CHARGES I I I I I r Print carefully shipping label II II Name II Street Addresa HStateZIP II Make checks payable AMA Send orders Academy Model Aeronautics 1810 Samuel Morse Dr Reston VA 22090 Linrnrn. urn urn ml Launch model positioning slightly nose up little left wind thrust line angles adequate model should gently climb right spiral about 10 seconds glide large left circle use short DT fuse forewarned Sparrow Hawk could startle disassembling itself air coming straight down plane does climb 200 turns flies much faster glide speed downthrust should reduced flight speed slow theres no climb try find some peppier rubber speed up right turn tight very lit tle climb reduce right thrust try again 200 turns Always use DT fuse simplest test flight things look good gradually increase number turns 650 700 about 500 turns will encounter so-called knee-in-the-torque curve sharply rapid rise potential power output Its zone Scale sport fliers tend give up win contest have keep trimming model zooms near-vertical 50 ft drops off right center-of-gravity should moved aft elevator angle reduced correct glide Dont change thrust line plane flew well 200 turns entire books have written adjusting Free Flight models theres still no substitute lot practice litfie experimenting own great deal can learned small model like P-30 anxiety worry associ ated flying bigger expensive After crashing P-30 wouldnt such big deal hold back optimal glide remember freewheel prop way out front de stabilizing influence functions gyro Therefore slower glide less effect prop will have Ill see next contest bring Sparrow Hawk well both have win ners Good luck Reno/Berliner Continued page 92 next year 1973 saw quite few rec ords overturned Lyle Shelton Wright R-3350-powered Bearcat turned time trials record 427 mph finals record 428 mph Formula Falck set qualifier record 235 mph Cote won finals 231 mph Among small field Sport Biplanes new all-metal Sundancer flown Sid White recordsetting 194 mph time trials 195 mph finals AT-6 time trials winner Jim Mott 211 mph Bill Turnbull took finals 207 mph 1974 Lyle Shelton came through another time trials record 432 mph Un limited bowed Ken Burnstine 382 mph finals hot ones dropped out Formula Ray Cote also scored record speeds 240 mph Name Street Address city State Zip HOBg RNATIONAL iNc November 1988 179 Modelers aioice High Quality Convenient Size Modest Price Jr Kwik Set Epoxy 5 OL $695 Gas Model Products 8773 Russet Dr Cincinnati OH 45239 dealer call 513-385-7398 order direct add *1 50 postage AMA INATONAII CENTENFOR Collectors Notice Just released AMA Museum BACK ISSUES Model Aviation magazinesNEW original car tons sale YEAR SETS ONLY Check selections below send SEPARATE $2200 CHECK individual set Orders will filled first-come basis set request sold out check will returned being cashed Limited Quantities Sets Are Complete L VIA
Edition: Model Aviation - 1988/11
Page Numbers: 72, 73, 74, 75, 76, 77, 78, 175, 178, 179
Hawk P-30 class has become popular cate gories out door Free Flight modeling can join ranks design thats proven winner John ODwyer WHY YOU ASK another P-30 swer should dear competitors heart P-30 lives up hopes designed really winand win does Sparrow Hawk definitely outper forms breed has placed con test its competed yet airplane maintains relative simplicity belies its capabilities As retired aeronautical engineer relative newcomer Free Flight modeling looking challenging event start off After reading rules roughed out first P-30 built flew itor tried Heavy ugly model barely got airborne Clearly better way decided use some experience education design betterperforming P-30 point lets review AMA rules P-30 40-gram minimum weight probably important consideration 30-in maximum dimension no long skinny efficient high aspect ratio wings 10 grams rubber use effectively freewheel plastic prop between 905 984 in diameter Are plastic props alike Other challenges became apparent de velopment progressed will cov ered later thing 40 years experience de signing full-scale aircraft will make totally obvious excess weight invariably primary reason poor performance Hence want competitive model keeping weight down should number consideration achieve need scale Any scale such pos tal scale weight watchers scale will Best though good threebeam laboratory scale calibrated grams 72 Model Aviation Sparrow Above A lot research went making simple-looking airplane consistent contest winner has become Fortunately hard work has already done re mains construct per plans instructions article Below author young friend Sean Bridges wind up again another trip Texas skies Thus equipped can weigh several piec es balsawood pick lightestor discover two apparenfly identical plas tic props actually differ weight two grams Also scale allows check youre flying maximum legal weight rubber arent shortchang ing yourself have simple postal scale calibrated ounces ounce equals 2834 grams 1 oz little 40 grams /4 oz slightly less 10 grams Since wingspan limited 30 low aspect ratio low wing loading seem best An aspect ratio betwecn 61 71 indicated lower limit several rea sons including rapid rise induced drag structural stability wingspan being compromise can least compensate using best possible air foil Airfoil requirements small slow Left When fastening monofilament line swivel use piece aluminum tubing crimped over lines end instead trying tie knot will inevitably sup out Right other end monofilament line permanently attached models left wing tip November 1988 73 balsa sheet trimmed shape before its formed around broom handle make body tube four pieces right glued together make wing mounting pylon aft end bulkhead mini swivel Once wing pops off its pylon dethermaliz ing remains connected fuselage piece monofilament line tied swivel pylon glued body tube CyA Placed shown acts partial exter nal bulkhead strengthening bodys center Cut out middle pylon save weight rear edge pylon notched cen ter snuffer tube Dark band around tube 24-hr epoxy Use sparingly its heavy plane like differ greatly what full-size aircraft need airfoils spe cifically designed low-speed regime considered Much has written subject Among authoritative works published Dieter Althaus based studies low-speed tunnel Stuttgart Germany Using P-30 model flight speed 8 10 ft per sec mea sured test gliding bleachers local gym best airfoil size speed appeared Sokolov Russian Glider section exhibited very good lift/drag ratio 601 tar bulator Lift/drag ratio best index gliding efficiency Sokolov mea sured nearly 80% higher easy-touse flat-bottomed Clark Y airfoil shape author lost first five Sparrow Hawks usual pop-up stab OTing failed bring back down Popping wing off way almost always gets model out thermal brings safely back down Left A common straight pin holds DT line place wing center rubberband secured Once band place lift line over pinhead rubberband will hold place against sandpaper Right band wrapped around fuselage strengthen area rear motor peg small rubberband keeps hollow peg place after tension rubber motor gone Lett The two side notcnes nob inc satety pin piace wouna moipr untii prop can installed safety pin piaced inc nose block prevent prop turning nose plug holding bands other backup hooked DT fuse lit 74 Model Aviation DT line runs along upper surface wing under hold-down rubberband back along left side fin over stab swivel end body tube Full-Size Plans Available Page 186 Fuselage first rolled tube fu selage building can kind fun begin selecting correct wood ex tremely important Whats required very straight-grained 3 x 36 x sheet medium-lightweight balsa Sig has good balsa have also found Mid west balsa carried local hobby shop very even-grained light /32 sheet thin enough can held up light check uniformity grain Reject sheets dark streaks indi cate harder-grained wood may crack rolled 3-in-wide sheet 1/3 thickness will make tube roughly 1 in diameter Thats bigger wound P-30 motor can save weight using smaller dia meter Trim /16 edge sheet along its full length cut off end length 281/2 Again save weight taper rear half %-in diame ter Referring photo prepared sheet cut two % x 14-in triangles part flat sheet will become tail end Apply two coats undiluted dope inside surface fuselage allowing about two hours drying between coats will seal inside against rubber lu bricant add strength cause tube curl like magic wet Locate broom handle something comparable % in diameter will serve mandrel body tube formed After dope thoroughly dry curl tube soaking balsa hot water bathtub about 10 min utes couple wet washcloths will hold balsa underwater soaks Place sheet broom handle wrap Ace bandage gauze strips some stretchable cloth will al Continued page 76 0 2 L aft 00 O S 2 / 012 / NH] 21 4 II ft -JK S 00 21 t0 S H 7 Li 7 E B 21 hft aa 20 Ca ft 50T ft 6 00 N 0 ft 0 L i1 K 02F 2 K4z November 1988 75 5 id 00 4 lx 4 LI Four keys black areas made two pieces dowel have split halves keys place accurate wing location pylon assured time 12 2- B aI 21Ja 2 L5kK j~ low wet tube diy handle dow el should large enough straight edges tube quite touch course tapered edges farther apart never fear will deal topic later Carefully set whole thing aside allow dry about 24 hours Cut 7-in piece off end sheet cut cross grain four equal pieces shown photo glued together edges using cyano acrylate CyA make 1% x 12-in strip will formed wing mount py lon Among CyAs Ive best luck Goldbergs Super Jet mediumviscosity fast-setting glue Make wing mount pylon using two symmetrical airfoils shown plans way make accurate copy obtain good dark Xerox copy full-size drawing Lay Xerox copy face down appropriate balsa sheet using dry flatiron MonoKote iron press down backside neatly transfer image balsa twice have two ribs Glue two ribs gether small spar-like rectangles shown Roughiy center subassembly 12-in-long A2 sheet equal amounts above below glue nose Working gradually attach side around trailing edge using CyA cut off excess rear Rough shape upper lower surfaces leave plenty material sanding time basic fuselage tube should dry Remove bandage slide mandrel straight sec tion tube can easily squeezed gether carefully secured CyA Once straight portion glued aft taper can closed Always keeping weight savings mind take care use too much CyA / ply bands shown drawing added both inside outside nose latter being rear rubber post two bands made -in-wide strips /-in-thick plywood about 3 long Make sure outside grain running direction /2-in strips Soak bands hot water wrap around mandrel used main body tube Hold plywood bands place rubberbands until dry adhere CyA Shape pylon mounting body tube sanding 180-grit paper wrapped around either mandrel fu selage body itself Attach aluminum snuffer tube angle shown using slowdrying metal bond epoxy Since epoxy very heavy sure use enough form narrow band around tube Sand both fuselage body tube pylon smooth surface reduce weight ribs pylon may cut out somewhat reduce weight further Locate glue pylon 6% 7 nose body important seam tube positioned bottom centerline before pylon attached Cut out disc / plywood making diameter aft end body tube Drill /l6 hole center insert through end small fishing swiv el short piece pin will prevent its re moval Secure swivel clear fiveminute epoxy Glue disc shown aft end fuselage body tube rein forcing couple small strips silk nylon single wrap h-in-wide silk fiveminute epoxy will strengthen front end well After epoxy has set up front cut three hes forward edge purpose upper po sition nose plug two side notches keep winding safety pin turning during transition winding motor installing prop fm made directly separate plan view facing right since cambered left turn flat left side Before begin make Xerox copies fin tail ribs use pat terns transferring wood use flat piece ceiling panel material work surface making wings tails first spray light coat Scotch spray adhesive board stick sec tion appropriate plan board spray plan section light coat same adhesive Caution sure keep spray light Cover plan section sheet wax paper latter works much better anything have tried cement super glue epoxy will stick damage plan Afterwards wax paper peels off plan leaving slightly sticky day Once youve made fin sand lightly paint outer edges coat Aero Gloss Balsa Sanding Sealer Cut Japanese tissue following grain longest dimension fin Coat struc ture thick dope lay tissue stretching out wrinldes problem areas dampen lit tle thinner trailing edge fin intended long enough extend through body tube add strength attachment Line up fin vertical wing pylon flat side fin should par allel body centerline stabilizer rest glued body tube left side about degree high aid left turn glide Water shrink fin tissue brush coat very thin nitrate dope Finish painting two coats thin sanding sealer waterproof outside body tube pylon sanding lightly between coats Wing fairly standard construction techaiques followed few suggestions order Iron Xerox copy main wing rib piece A2 plywood white painted aluminum carefully cut file shape Use template cut out ribs Stack balsa ribs us ing two pieces scrap /6-sq balsa 76 Model Aviation ii 0 m 0 K I 1 0 -I ii 0 z z 0 I0 C C n 0 z 0 z C, 0 -u 0 -a m I m 0 Q C -I CD C, C 0 C, 1 0 U 0 0 01 0 LzU N 0 C S S. S. CA S. CA x oo x x oo mini 01 x oo x S. x U spar grooves Sand stack ribs uniform contour length Pin down trailing edge waxpaper-covered plan using some scrap piec es wood block up forward edge /32 46-sq rib jig strip located about ard trailing edge preparation assures accurate undercamber extremely important low-speed airfoil triangular dihedral checker used assure center ribs set proper angle prior gluing place completed half removed plans propped up correct dihedral gle glued together quite bit Super Jet CyA rather steep V di hedral V saves about 1 grams weight over polyhedral configuration Cover Japanese tissue grain running spanwise turbulator made model railroading HO gauge scale 2 x 4s wing finished free warps washin washout makes much easier check prior flying ses sion generous amount dihedral correct pylon height will lessen need intentional wing warps Stabilizer Construction straightforward Use lightweight wood can get away coat dope Ft Worth TX coat does job live near water may have use two coats Just keep light possible Note liffle notch trailing edge center mates short peg 1/16 dowel added point rear end body help keep stab line bottom peg also keeps stab hold-down rubber body pre vents interfering dethermal izer DT swivel Propeller assembly Only few plas tic props available suitable P-30 models common Japanese rounded-tip type come green blue silver-gray doesnt seem verifiable difference among some people claim silver ones better propellers 9%-in di ameter 7-in pitch weigh 68 71 grams Another prop style now imported Europe type has square tip has same 9%-in diameter rounded-tip type has 9-in nominal pitch weighs seven grams As far know props available yellow FAT Model Supply carries facsimile prop however gram heavier original fre quently out balance AMA rules illegal shave sand P-30 prop lighten balance comparative evaluation per formance type propeller three different nose block assemblies con structedone round-tip prop Continued page 78 IWiVG MFG Tigerskini4 WHAT DO YOU CALL THE BEST SHEETING MATERIAL FOR FOAM WING CORES Wing Mfg pioneered foam core wing construction early 60s have used everything tangowood 002 stainless steel sheeting last few years have using pressure laminates evolved R & 0 work Uncle Sam Tigurskins pre-finish high density posterboard material clear laminated plastic film top simply apply contact cement such Styro-Stick adhesive cores sheeting press sheeting Onto cores material pliable can easily wrap around leading edges Tigerskins CHECK THESE FEATURES Superior strength weight ratio Superior bond capability foam 001 per sq temperature stability Smooth high gloss finish Superior resistance nitro fuel Superior resistance weather Easy apply Low low cost 01/64 23 35 size Comes following colors Waco Red Polar White Insignia Blue Sun Yellow $495 PER SHEET // pk00417 ORDERING Send check money order required amount Add $395 shipping 1 6 sheets Add $749 shipping 7 12 sheets SEND TO Wing Mfg P0 Boa 33 Crystal Lake IL 60014 Illinois Residents add 6 1/20/0 sales tea Super Styro-Stick wing skin adhesive $598 16 oz Can Item #601 can does wing up 70 No eatra shipping cost ordered Tigerskins See Tigerakins Chicago Model & Hobby Show Booth 1735 SEND $350 FOR CATALOG November 1988 77 ORDERS SHIPPED DAY RECEIVED WARBIRD VIDEOS VHS OR BETA DUR 23RD YEAR R ANY TWO VIDEOS ONLY $7595 ANY 3 VIDEOS ONLY $19795 SPECIAL IMTRDD6TDRY OFFEALL IVIDEOS ONLY $19995 WARBIRD CHECKOUT VOL 1 Flying P-40 Warhawk Corsair Hellcat SB2-A Buccanneer Avenger NF 1325 Programs2 Hr Only $3995 WARBIRD CHECKOUT VOL II Flying P-38 Mitchell Bomber P-61 Black Widow Invader NF 1454 Programsi 00 Mm Only $3995 WARBIRD CHECKOUT VOL III Flying P-Si Mustang A-20 Bomber P-39 Introduction P-39 Advanced NF 1514 Programslb Mm Only $3995 CALL TOLL FREE CREDIT CARDS Li J Day Night California outside USA 213 827-8666 Shi pin Paid Continental US-Foreign add $500 0 California residents add 6 1/2% tax NFVIDEQ LIBRARY 2554 LINCOLN BLVD #568 MARINA DEL REY CA 90291 PRECISION MODEL PRODUCTS ZZ7jjJosM Made U S BARSTOCK ALUMINUM SPINNERS Part NoSize TT-150-B .1-112 TT-175-B .1-314 TT-200-B 11-225-B 14 11-226-B 2114 FAt . TT-250-B .. 2-1/2 11-251-B . 2-1/2FAI .. 11-275-B 3/4 11-276-B 314 FAt .. 11-300-B 11-301-BFAI 11-325-B .. 3-1/4 . TI-350-B . 2 TT-375-B . 3-3/4 . TT-400-B 4 RetailApprox PriceWeight $1395058 02 149509502 1595180oz 169516002 189515002 189519002 209517002 229522002 249520002 2695260oz 289525002 369534002 499547002 5995520oz 699557002 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available Sizes Add $300 Per Spinner PROP NUT ADAPTORS Part No Size 11-140A . 1/4-28 T1-147A -28/7mm 11-610-A 6 x 10mm 11-710-A 10mm 11-516-A 5/16-24 11-518-A 5/16-24/8mm 11-810-A 8 x 10mm 11-825-A 8 x 125mm 11-375-A 3/8-24 11-125-A lOx 125mm Approx Weight 061 oz 061 oz 063 oz 0 82 oz 076 oz 076oz 076 oz 075 oz 117 oz 115 oz 3 Pieces Nut Washer Machined Bushing Add $350 Shipping Handling Prices subject change notice ROMCO MFG INC OX 836 SOUTH HOUSTON TEXAS 77587 713 943-1867 square-tip prop dummy nose same weight glide tested times bleachers local Indoor site square-tip prop consist ently showed approximately 15% longer en durance other types probably due its higher pitch lower blade area higher pitch has also appeared help climb reducing initial difficult-tomanage acceleration increasing length prop run small degree havent discovered method accurately determining prop gave P-30 higher climb prop nose block assembled standard way freewheel notch prop will work better last longer short outer end shaft bent first about 950 small bend radius pos sible Assemble bend hooked part last Assembly first five Sparrow Hawks lost thermals though conven tional pop-up-tail dethermalizer acti vated Two disappeared straight up taught us very light wing loading P-30 requires something reliable standard DT method have used last five ships variation system first used Ken Wer nicke locally may have invented George Xenakis works like DT fuse like Pecks 3/10-in-diameter lightweight fuse burns through #32 rubberband wing [ hold-down wing pops off re tained 12-lb-test monofilament fish ing line attached wing tip swivel tail end fuselage freewheel prop spinning wing re strain model during fall Using system Sparrow Hawk has never failed break out strongest thermal yet model has landed con crete runways prop nose breaking slight drawback method can difficult extricate model tree fishing line wrapped around branches solution simply cut line carry extra sup ply Dont try tie fishing line short piece Y16-diameter aluminum tubing squeezed pliers both easier adjust reliable short piece head end straight pin protrudes top wing centerline assemble wing body fishing line pulled tight tail over stab around pin out wing tip Monofilament line has sufficient stretch stay taut its proper length wing hold-down rub berband goes over line hold place during flight wing place check square body centerline Glue four keys made split halves 1A-in dowel onto wing will serve guides ensure accurate positioning reattaching wing Continued page 175 @cMlPL 8b 78 Model Aviation Retail Price S495 495 495 495 495 495 495 495 595 595 t1C IN SPIHHJ11 WELL---- YR GOT THE PLANE IN BUT WHERE ARE WE GONNR 0 -v /0 lizer braces 2/ x -in softwing TEs 1 x 1 x 4-in soft blocknose & tail blocks Other Wood l%2 x x 19-in hardwood stripflap & eleva tor joiners plywood approx 1 x 7 firewall landing gear bulkhead bellcrank mount 1A x x 13-in hardwoodmotor mounts Other Materials Plans Building board Straight pins Wax paper 1Cox Tee Dee 049 051 engine 1propeller 6 x 4 Cox plastic Top Flite Zinger wood 11-in plastic spinner Ace RC Inc 1-oz wedge fuel tank Perfect #20 /s x 4-in brats tubingtank vent extension leadout guides 2 small plastic flexible fuel line /16 x 28-in music wtrepushrods landing gear 032 x 4-in music wiretailskid 12-in bellcrank mounting hardware Perfect comparable 36-in length braided lead-out line Perfect com parable 1 pairflying wire clips Perfect Du-Bro com parable 1 pair1%-in-dia plastic wheels Sig comparable 1 pair/s-in wheel collars Perfect Du-Bro comparable 42-56 x -in engine mounting bolts locknuts 2small control horns Perfect comparable flaps elevator 4wire pushrod keepers /6-in-dia music wire 48% x -in similar size fabric control surface hinges Aliphatic resin glue Franklin Tite Bond compar able Five-minute epoxy glue Duro comparable Garnet paper 100- 200-grit Norton compa rable Wet-or-dry paper 400-grit 3M comparable 1 sheetlightweight silkspan Fuel-proof dopeSig clear sanding sealer Diana Cream Stearman Red comparable 1-in numerals AMA license number 1 set012-inx 35-ft braided steel flying wire Sul livan comparable 1A control handle Sullivan comparable Cox Super Power Glow Fuel above parts materials should available local hobby shop Theres word some streets supplies Con trol Line models arent available anymore weve found true able secure everything needed build Lil Bit other models Johnny Clemens Hobby Counter Dallas know other shops stock order Control Line supplies So dont accept Geewe cant get anymore cause its just true Control Line alive Sparrow Hawk/ODwyer Continued page 78 Sparrow Hawk flies best four strands 3/6-in rubber Ten grams FM Champion rubber will 78 80 long Wash off powder coats rubber soapy water Use following method tying rubber will never slip Tie single overhand knot close end possible Laying two ends adja cent other tie another overhand knot two strands Use liberal amounts Continued page 178 Finest Kits Youll Ever Buy Build TraIn-Air 20 Train-Air 40 Sport-Air 40 Bel-AIr 40 40 Hydro-Floats rsa eesy handling uperior serobetic modern looking sport exhibition biplane has filled 55, 6 75 lbs 148 185 207-4901M1 Wise & Uastereeu4ed 1 KIT FEATURES Polyester fiberglass fusalage cowling retractable landing 92 wingspan gear Foam cores wing stab Available major production variations F4F-3 -3A -4 FM-i FM-2 Semi-Kit Fusalage cowling foam cores wing stab canopy retractable landing gear plans$27500 Complete Kit Everything listed semi-kit plus wood parts hardware necessary complete kit including 1/64 plywood sheeting wings$45000 Deluxe Kit Complete kit fusalage preassembled $85000 wings stab presheeted control surfaces prebuilt Information Package $100 VISA/MasterCard accepted add $1500 sh pp ng daho es add 5% Sa es tax Classic Glass PO Box 503 Blackfoot Idaho 83221-0503 Mike Zamber 208 785-2309 November 1988 175 fine tine kits ate machine cut sasist building reel show 80 has fully summetricel wing sections gives gresteat potential serobstic er upflght Inverted ship cspsble very slow close-In type flight right up robatic schedule can muster Classic Glass Grumman Wildcat B limEd ATIIE BEST IN ELECTRIC FLIGHT SPECIALIZING IH ASTRO FLIBHT SYSTEM -ENflI 111 ___________________________________________________ 1 I -RRl i 5l 1j CS Flight SgsteNs 31 Perrj Street Hiddlebero M 023483117 Phone 617947-2905 6 9 P H Go . Fredy Glow PIL 15 volt saliva lubricate knot pulled very tight small knots acting limit stops Cut off excess Coat rubber good grade rub ber lube install body tube push stick adequate length rear rubber support tube retained small rubberband shown photo Put two small rubberbands front end body tube behind little trian gles bands serves backnp difficult replace mo tor wound Cut short piece DT fuse slide snuffer tube use pair tweezers hold back wing mount rubberband sure positioned designed modernDealer hnuerle ported engines Dealer Inquiries Invited S Part Cam*ea% Auos 9w against fuse once latter place against snuffer tube Check center-of-gravity prop installed should balance rear spar bot tom surface wing off either direction little lead tape needed light end course out-of-balance situation can avoided entirely waiting until time glue pylon onto body Check Sparrow Hawk over warps wing tail steam out neces sary plan use model competi tion put AMA number right panel name address some plane Im usually eager go fly write AMA number black marking pen use mail address stickers name Since lost P-30s have returned maybe should also mention reward address label Flying Wait calm day test fly Before flying session lubricate prop shaft thin oil such sewing machine oil type comes neat pen cil dispenser fits nicely toolbox Test glide shim trim rear stab support until obtain slowest possi ble glide stalling Using winder put about 200 turns motor use various holes notches flagged safety pin see pho tos obvious Light DT fuse another piece fuse Never use match cigarette lighter light fuse air plane nitrate dope tissue al explosive WILLIAMS ACCESSORIES BROTHERS 4 PILOTS STANDARD TSMAN 0 RACING TAR VINTAGE TH CONTOUR BALLOON EN AGE 178 Model Aviation 10 Sparrow Hawk/ODwyer Continued page 175 HI-TECH ENCODER microprocessor based encoder board designed replace encoder board Futaba Conquest Ace Silver Seven transmitters compatible other AM FM radios market FEATURES complete calibration system use trimpots stores calibration constants four aircraft maintained during power off can mix first five channels other first five channels variety configoratiom exponential trim five strengtlss mixing expo trim can turned off during flight contrul trun throttle cntoff dual-rates servo reversing outputs four eight channels POWER REQUIREMENTS 32ma @ 96vdc SIZE 3 x45 x 75 inches SEND $400 installation operation manual oaly $17500 completely assembled tested encoder installation operation manual Please stare transmitter nwdel number channels Add $500 shipping handling EMULATION ELECTRONICS 2206 S Lynn Urbana 1L61801 217-344-8740or217-4697647 PARABELLUM 1975 July first issue 1976 197701982 197801983 1979-9-4-9641980-9--4-9&5198101986 i0 0 0 i0 Enclose separate $2200 check set ordered NO CASH NO CHARGES I I I I I r Print carefully shipping label II II Name II Street Addresa HStateZIP II Make checks payable AMA Send orders Academy Model Aeronautics 1810 Samuel Morse Dr Reston VA 22090 Linrnrn. urn urn ml Launch model positioning slightly nose up little left wind thrust line angles adequate model should gently climb right spiral about 10 seconds glide large left circle use short DT fuse forewarned Sparrow Hawk could startle disassembling itself air coming straight down plane does climb 200 turns flies much faster glide speed downthrust should reduced flight speed slow theres no climb try find some peppier rubber speed up right turn tight very lit tle climb reduce right thrust try again 200 turns Always use DT fuse simplest test flight things look good gradually increase number turns 650 700 about 500 turns will encounter so-called knee-in-the-torque curve sharply rapid rise potential power output Its zone Scale sport fliers tend give up win contest have keep trimming model zooms near-vertical 50 ft drops off right center-of-gravity should moved aft elevator angle reduced correct glide Dont change thrust line plane flew well 200 turns entire books have written adjusting Free Flight models theres still no substitute lot practice litfie experimenting own great deal can learned small model like P-30 anxiety worry associ ated flying bigger expensive After crashing P-30 wouldnt such big deal hold back optimal glide remember freewheel prop way out front de stabilizing influence functions gyro Therefore slower glide less effect prop will have Ill see next contest bring Sparrow Hawk well both have win ners Good luck Reno/Berliner Continued page 92 next year 1973 saw quite few rec ords overturned Lyle Shelton Wright R-3350-powered Bearcat turned time trials record 427 mph finals record 428 mph Formula Falck set qualifier record 235 mph Cote won finals 231 mph Among small field Sport Biplanes new all-metal Sundancer flown Sid White recordsetting 194 mph time trials 195 mph finals AT-6 time trials winner Jim Mott 211 mph Bill Turnbull took finals 207 mph 1974 Lyle Shelton came through another time trials record 432 mph Un limited bowed Ken Burnstine 382 mph finals hot ones dropped out Formula Ray Cote also scored record speeds 240 mph Name Street Address city State Zip HOBg RNATIONAL iNc November 1988 179 Modelers aioice High Quality Convenient Size Modest Price Jr Kwik Set Epoxy 5 OL $695 Gas Model Products 8773 Russet Dr Cincinnati OH 45239 dealer call 513-385-7398 order direct add *1 50 postage AMA INATONAII CENTENFOR Collectors Notice Just released AMA Museum BACK ISSUES Model Aviation magazinesNEW original car tons sale YEAR SETS ONLY Check selections below send SEPARATE $2200 CHECK individual set Orders will filled first-come basis set request sold out check will returned being cashed Limited Quantities Sets Are Complete L VIA
Edition: Model Aviation - 1988/11
Page Numbers: 72, 73, 74, 75, 76, 77, 78, 175, 178, 179
Hawk P-30 class has become popular cate gories out door Free Flight modeling can join ranks design thats proven winner John ODwyer WHY YOU ASK another P-30 swer should dear competitors heart P-30 lives up hopes designed really winand win does Sparrow Hawk definitely outper forms breed has placed con test its competed yet airplane maintains relative simplicity belies its capabilities As retired aeronautical engineer relative newcomer Free Flight modeling looking challenging event start off After reading rules roughed out first P-30 built flew itor tried Heavy ugly model barely got airborne Clearly better way decided use some experience education design betterperforming P-30 point lets review AMA rules P-30 40-gram minimum weight probably important consideration 30-in maximum dimension no long skinny efficient high aspect ratio wings 10 grams rubber use effectively freewheel plastic prop between 905 984 in diameter Are plastic props alike Other challenges became apparent de velopment progressed will cov ered later thing 40 years experience de signing full-scale aircraft will make totally obvious excess weight invariably primary reason poor performance Hence want competitive model keeping weight down should number consideration achieve need scale Any scale such pos tal scale weight watchers scale will Best though good threebeam laboratory scale calibrated grams 72 Model Aviation Sparrow Above A lot research went making simple-looking airplane consistent contest winner has become Fortunately hard work has already done re mains construct per plans instructions article Below author young friend Sean Bridges wind up again another trip Texas skies Thus equipped can weigh several piec es balsawood pick lightestor discover two apparenfly identical plas tic props actually differ weight two grams Also scale allows check youre flying maximum legal weight rubber arent shortchang ing yourself have simple postal scale calibrated ounces ounce equals 2834 grams 1 oz little 40 grams /4 oz slightly less 10 grams Since wingspan limited 30 low aspect ratio low wing loading seem best An aspect ratio betwecn 61 71 indicated lower limit several rea sons including rapid rise induced drag structural stability wingspan being compromise can least compensate using best possible air foil Airfoil requirements small slow Left When fastening monofilament line swivel use piece aluminum tubing crimped over lines end instead trying tie knot will inevitably sup out Right other end monofilament line permanently attached models left wing tip November 1988 73 balsa sheet trimmed shape before its formed around broom handle make body tube four pieces right glued together make wing mounting pylon aft end bulkhead mini swivel Once wing pops off its pylon dethermaliz ing remains connected fuselage piece monofilament line tied swivel pylon glued body tube CyA Placed shown acts partial exter nal bulkhead strengthening bodys center Cut out middle pylon save weight rear edge pylon notched cen ter snuffer tube Dark band around tube 24-hr epoxy Use sparingly its heavy plane like differ greatly what full-size aircraft need airfoils spe cifically designed low-speed regime considered Much has written subject Among authoritative works published Dieter Althaus based studies low-speed tunnel Stuttgart Germany Using P-30 model flight speed 8 10 ft per sec mea sured test gliding bleachers local gym best airfoil size speed appeared Sokolov Russian Glider section exhibited very good lift/drag ratio 601 tar bulator Lift/drag ratio best index gliding efficiency Sokolov mea sured nearly 80% higher easy-touse flat-bottomed Clark Y airfoil shape author lost first five Sparrow Hawks usual pop-up stab OTing failed bring back down Popping wing off way almost always gets model out thermal brings safely back down Left A common straight pin holds DT line place wing center rubberband secured Once band place lift line over pinhead rubberband will hold place against sandpaper Right band wrapped around fuselage strengthen area rear motor peg small rubberband keeps hollow peg place after tension rubber motor gone Lett The two side notcnes nob inc satety pin piace wouna moipr untii prop can installed safety pin piaced inc nose block prevent prop turning nose plug holding bands other backup hooked DT fuse lit 74 Model Aviation DT line runs along upper surface wing under hold-down rubberband back along left side fin over stab swivel end body tube Full-Size Plans Available Page 186 Fuselage first rolled tube fu selage building can kind fun begin selecting correct wood ex tremely important Whats required very straight-grained 3 x 36 x sheet medium-lightweight balsa Sig has good balsa have also found Mid west balsa carried local hobby shop very even-grained light /32 sheet thin enough can held up light check uniformity grain Reject sheets dark streaks indi cate harder-grained wood may crack rolled 3-in-wide sheet 1/3 thickness will make tube roughly 1 in diameter Thats bigger wound P-30 motor can save weight using smaller dia meter Trim /16 edge sheet along its full length cut off end length 281/2 Again save weight taper rear half %-in diame ter Referring photo prepared sheet cut two % x 14-in triangles part flat sheet will become tail end Apply two coats undiluted dope inside surface fuselage allowing about two hours drying between coats will seal inside against rubber lu bricant add strength cause tube curl like magic wet Locate broom handle something comparable % in diameter will serve mandrel body tube formed After dope thoroughly dry curl tube soaking balsa hot water bathtub about 10 min utes couple wet washcloths will hold balsa underwater soaks Place sheet broom handle wrap Ace bandage gauze strips some stretchable cloth will al Continued page 76 0 2 L aft 00 O S 2 / 012 / NH] 21 4 II ft -JK S 00 21 t0 S H 7 Li 7 E B 21 hft aa 20 Ca ft 50T ft 6 00 N 0 ft 0 L i1 K 02F 2 K4z November 1988 75 5 id 00 4 lx 4 LI Four keys black areas made two pieces dowel have split halves keys place accurate wing location pylon assured time 12 2- B aI 21Ja 2 L5kK j~ low wet tube diy handle dow el should large enough straight edges tube quite touch course tapered edges farther apart never fear will deal topic later Carefully set whole thing aside allow dry about 24 hours Cut 7-in piece off end sheet cut cross grain four equal pieces shown photo glued together edges using cyano acrylate CyA make 1% x 12-in strip will formed wing mount py lon Among CyAs Ive best luck Goldbergs Super Jet mediumviscosity fast-setting glue Make wing mount pylon using two symmetrical airfoils shown plans way make accurate copy obtain good dark Xerox copy full-size drawing Lay Xerox copy face down appropriate balsa sheet using dry flatiron MonoKote iron press down backside neatly transfer image balsa twice have two ribs Glue two ribs gether small spar-like rectangles shown Roughiy center subassembly 12-in-long A2 sheet equal amounts above below glue nose Working gradually attach side around trailing edge using CyA cut off excess rear Rough shape upper lower surfaces leave plenty material sanding time basic fuselage tube should dry Remove bandage slide mandrel straight sec tion tube can easily squeezed gether carefully secured CyA Once straight portion glued aft taper can closed Always keeping weight savings mind take care use too much CyA / ply bands shown drawing added both inside outside nose latter being rear rubber post two bands made -in-wide strips /-in-thick plywood about 3 long Make sure outside grain running direction /2-in strips Soak bands hot water wrap around mandrel used main body tube Hold plywood bands place rubberbands until dry adhere CyA Shape pylon mounting body tube sanding 180-grit paper wrapped around either mandrel fu selage body itself Attach aluminum snuffer tube angle shown using slowdrying metal bond epoxy Since epoxy very heavy sure use enough form narrow band around tube Sand both fuselage body tube pylon smooth surface reduce weight ribs pylon may cut out somewhat reduce weight further Locate glue pylon 6% 7 nose body important seam tube positioned bottom centerline before pylon attached Cut out disc / plywood making diameter aft end body tube Drill /l6 hole center insert through end small fishing swiv el short piece pin will prevent its re moval Secure swivel clear fiveminute epoxy Glue disc shown aft end fuselage body tube rein forcing couple small strips silk nylon single wrap h-in-wide silk fiveminute epoxy will strengthen front end well After epoxy has set up front cut three hes forward edge purpose upper po sition nose plug two side notches keep winding safety pin turning during transition winding motor installing prop fm made directly separate plan view facing right since cambered left turn flat left side Before begin make Xerox copies fin tail ribs use pat terns transferring wood use flat piece ceiling panel material work surface making wings tails first spray light coat Scotch spray adhesive board stick sec tion appropriate plan board spray plan section light coat same adhesive Caution sure keep spray light Cover plan section sheet wax paper latter works much better anything have tried cement super glue epoxy will stick damage plan Afterwards wax paper peels off plan leaving slightly sticky day Once youve made fin sand lightly paint outer edges coat Aero Gloss Balsa Sanding Sealer Cut Japanese tissue following grain longest dimension fin Coat struc ture thick dope lay tissue stretching out wrinldes problem areas dampen lit tle thinner trailing edge fin intended long enough extend through body tube add strength attachment Line up fin vertical wing pylon flat side fin should par allel body centerline stabilizer rest glued body tube left side about degree high aid left turn glide Water shrink fin tissue brush coat very thin nitrate dope Finish painting two coats thin sanding sealer waterproof outside body tube pylon sanding lightly between coats Wing fairly standard construction techaiques followed few suggestions order Iron Xerox copy main wing rib piece A2 plywood white painted aluminum carefully cut file shape Use template cut out ribs Stack balsa ribs us ing two pieces scrap /6-sq balsa 76 Model Aviation ii 0 m 0 K I 1 0 -I ii 0 z z 0 I0 C C n 0 z 0 z C, 0 -u 0 -a m I m 0 Q C -I CD C, C 0 C, 1 0 U 0 0 01 0 LzU N 0 C S S. S. CA S. CA x oo x x oo mini 01 x oo x S. x U spar grooves Sand stack ribs uniform contour length Pin down trailing edge waxpaper-covered plan using some scrap piec es wood block up forward edge /32 46-sq rib jig strip located about ard trailing edge preparation assures accurate undercamber extremely important low-speed airfoil triangular dihedral checker used assure center ribs set proper angle prior gluing place completed half removed plans propped up correct dihedral gle glued together quite bit Super Jet CyA rather steep V di hedral V saves about 1 grams weight over polyhedral configuration Cover Japanese tissue grain running spanwise turbulator made model railroading HO gauge scale 2 x 4s wing finished free warps washin washout makes much easier check prior flying ses sion generous amount dihedral correct pylon height will lessen need intentional wing warps Stabilizer Construction straightforward Use lightweight wood can get away coat dope Ft Worth TX coat does job live near water may have use two coats Just keep light possible Note liffle notch trailing edge center mates short peg 1/16 dowel added point rear end body help keep stab line bottom peg also keeps stab hold-down rubber body pre vents interfering dethermal izer DT swivel Propeller assembly Only few plas tic props available suitable P-30 models common Japanese rounded-tip type come green blue silver-gray doesnt seem verifiable difference among some people claim silver ones better propellers 9%-in di ameter 7-in pitch weigh 68 71 grams Another prop style now imported Europe type has square tip has same 9%-in diameter rounded-tip type has 9-in nominal pitch weighs seven grams As far know props available yellow FAT Model Supply carries facsimile prop however gram heavier original fre quently out balance AMA rules illegal shave sand P-30 prop lighten balance comparative evaluation per formance type propeller three different nose block assemblies con structedone round-tip prop Continued page 78 IWiVG MFG Tigerskini4 WHAT DO YOU CALL THE BEST SHEETING MATERIAL FOR FOAM WING CORES Wing Mfg pioneered foam core wing construction early 60s have used everything tangowood 002 stainless steel sheeting last few years have using pressure laminates evolved R & 0 work Uncle Sam Tigurskins pre-finish high density posterboard material clear laminated plastic film top simply apply contact cement such Styro-Stick adhesive cores sheeting press sheeting Onto cores material pliable can easily wrap around leading edges Tigerskins CHECK THESE FEATURES Superior strength weight ratio Superior bond capability foam 001 per sq temperature stability Smooth high gloss finish Superior resistance nitro fuel Superior resistance weather Easy apply Low low cost 01/64 23 35 size Comes following colors Waco Red Polar White Insignia Blue Sun Yellow $495 PER SHEET // pk00417 ORDERING Send check money order required amount Add $395 shipping 1 6 sheets Add $749 shipping 7 12 sheets SEND TO Wing Mfg P0 Boa 33 Crystal Lake IL 60014 Illinois Residents add 6 1/20/0 sales tea Super Styro-Stick wing skin adhesive $598 16 oz Can Item #601 can does wing up 70 No eatra shipping cost ordered Tigerskins See Tigerakins Chicago Model & Hobby Show Booth 1735 SEND $350 FOR CATALOG November 1988 77 ORDERS SHIPPED DAY RECEIVED WARBIRD VIDEOS VHS OR BETA DUR 23RD YEAR R ANY TWO VIDEOS ONLY $7595 ANY 3 VIDEOS ONLY $19795 SPECIAL IMTRDD6TDRY OFFEALL IVIDEOS ONLY $19995 WARBIRD CHECKOUT VOL 1 Flying P-40 Warhawk Corsair Hellcat SB2-A Buccanneer Avenger NF 1325 Programs2 Hr Only $3995 WARBIRD CHECKOUT VOL II Flying P-38 Mitchell Bomber P-61 Black Widow Invader NF 1454 Programsi 00 Mm Only $3995 WARBIRD CHECKOUT VOL III Flying P-Si Mustang A-20 Bomber P-39 Introduction P-39 Advanced NF 1514 Programslb Mm Only $3995 CALL TOLL FREE CREDIT CARDS Li J Day Night California outside USA 213 827-8666 Shi pin Paid Continental US-Foreign add $500 0 California residents add 6 1/2% tax NFVIDEQ LIBRARY 2554 LINCOLN BLVD #568 MARINA DEL REY CA 90291 PRECISION MODEL PRODUCTS ZZ7jjJosM Made U S BARSTOCK ALUMINUM SPINNERS Part NoSize TT-150-B .1-112 TT-175-B .1-314 TT-200-B 11-225-B 14 11-226-B 2114 FAt . TT-250-B .. 2-1/2 11-251-B . 2-1/2FAI .. 11-275-B 3/4 11-276-B 314 FAt .. 11-300-B 11-301-BFAI 11-325-B .. 3-1/4 . TI-350-B . 2 TT-375-B . 3-3/4 . TT-400-B 4 RetailApprox PriceWeight $1395058 02 149509502 1595180oz 169516002 189515002 189519002 209517002 229522002 249520002 2695260oz 289525002 369534002 499547002 5995520oz 699557002 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available Sizes Add $300 Per Spinner PROP NUT ADAPTORS Part No Size 11-140A . 1/4-28 T1-147A -28/7mm 11-610-A 6 x 10mm 11-710-A 10mm 11-516-A 5/16-24 11-518-A 5/16-24/8mm 11-810-A 8 x 10mm 11-825-A 8 x 125mm 11-375-A 3/8-24 11-125-A lOx 125mm Approx Weight 061 oz 061 oz 063 oz 0 82 oz 076 oz 076oz 076 oz 075 oz 117 oz 115 oz 3 Pieces Nut Washer Machined Bushing Add $350 Shipping Handling Prices subject change notice ROMCO MFG INC OX 836 SOUTH HOUSTON TEXAS 77587 713 943-1867 square-tip prop dummy nose same weight glide tested times bleachers local Indoor site square-tip prop consist ently showed approximately 15% longer en durance other types probably due its higher pitch lower blade area higher pitch has also appeared help climb reducing initial difficult-tomanage acceleration increasing length prop run small degree havent discovered method accurately determining prop gave P-30 higher climb prop nose block assembled standard way freewheel notch prop will work better last longer short outer end shaft bent first about 950 small bend radius pos sible Assemble bend hooked part last Assembly first five Sparrow Hawks lost thermals though conven tional pop-up-tail dethermalizer acti vated Two disappeared straight up taught us very light wing loading P-30 requires something reliable standard DT method have used last five ships variation system first used Ken Wer nicke locally may have invented George Xenakis works like DT fuse like Pecks 3/10-in-diameter lightweight fuse burns through #32 rubberband wing [ hold-down wing pops off re tained 12-lb-test monofilament fish ing line attached wing tip swivel tail end fuselage freewheel prop spinning wing re strain model during fall Using system Sparrow Hawk has never failed break out strongest thermal yet model has landed con crete runways prop nose breaking slight drawback method can difficult extricate model tree fishing line wrapped around branches solution simply cut line carry extra sup ply Dont try tie fishing line short piece Y16-diameter aluminum tubing squeezed pliers both easier adjust reliable short piece head end straight pin protrudes top wing centerline assemble wing body fishing line pulled tight tail over stab around pin out wing tip Monofilament line has sufficient stretch stay taut its proper length wing hold-down rub berband goes over line hold place during flight wing place check square body centerline Glue four keys made split halves 1A-in dowel onto wing will serve guides ensure accurate positioning reattaching wing Continued page 175 @cMlPL 8b 78 Model Aviation Retail Price S495 495 495 495 495 495 495 495 595 595 t1C IN SPIHHJ11 WELL---- YR GOT THE PLANE IN BUT WHERE ARE WE GONNR 0 -v /0 lizer braces 2/ x -in softwing TEs 1 x 1 x 4-in soft blocknose & tail blocks Other Wood l%2 x x 19-in hardwood stripflap & eleva tor joiners plywood approx 1 x 7 firewall landing gear bulkhead bellcrank mount 1A x x 13-in hardwoodmotor mounts Other Materials Plans Building board Straight pins Wax paper 1Cox Tee Dee 049 051 engine 1propeller 6 x 4 Cox plastic Top Flite Zinger wood 11-in plastic spinner Ace RC Inc 1-oz wedge fuel tank Perfect #20 /s x 4-in brats tubingtank vent extension leadout guides 2 small plastic flexible fuel line /16 x 28-in music wtrepushrods landing gear 032 x 4-in music wiretailskid 12-in bellcrank mounting hardware Perfect comparable 36-in length braided lead-out line Perfect com parable 1 pairflying wire clips Perfect Du-Bro com parable 1 pair1%-in-dia plastic wheels Sig comparable 1 pair/s-in wheel collars Perfect Du-Bro comparable 42-56 x -in engine mounting bolts locknuts 2small control horns Perfect comparable flaps elevator 4wire pushrod keepers /6-in-dia music wire 48% x -in similar size fabric control surface hinges Aliphatic resin glue Franklin Tite Bond compar able Five-minute epoxy glue Duro comparable Garnet paper 100- 200-grit Norton compa rable Wet-or-dry paper 400-grit 3M comparable 1 sheetlightweight silkspan Fuel-proof dopeSig clear sanding sealer Diana Cream Stearman Red comparable 1-in numerals AMA license number 1 set012-inx 35-ft braided steel flying wire Sul livan comparable 1A control handle Sullivan comparable Cox Super Power Glow Fuel above parts materials should available local hobby shop Theres word some streets supplies Con trol Line models arent available anymore weve found true able secure everything needed build Lil Bit other models Johnny Clemens Hobby Counter Dallas know other shops stock order Control Line supplies So dont accept Geewe cant get anymore cause its just true Control Line alive Sparrow Hawk/ODwyer Continued page 78 Sparrow Hawk flies best four strands 3/6-in rubber Ten grams FM Champion rubber will 78 80 long Wash off powder coats rubber soapy water Use following method tying rubber will never slip Tie single overhand knot close end possible Laying two ends adja cent other tie another overhand knot two strands Use liberal amounts Continued page 178 Finest Kits Youll Ever Buy Build TraIn-Air 20 Train-Air 40 Sport-Air 40 Bel-AIr 40 40 Hydro-Floats rsa eesy handling uperior serobetic modern looking sport exhibition biplane has filled 55, 6 75 lbs 148 185 207-4901M1 Wise & Uastereeu4ed 1 KIT FEATURES Polyester fiberglass fusalage cowling retractable landing 92 wingspan gear Foam cores wing stab Available major production variations F4F-3 -3A -4 FM-i FM-2 Semi-Kit Fusalage cowling foam cores wing stab canopy retractable landing gear plans$27500 Complete Kit Everything listed semi-kit plus wood parts hardware necessary complete kit including 1/64 plywood sheeting wings$45000 Deluxe Kit Complete kit fusalage preassembled $85000 wings stab presheeted control surfaces prebuilt Information Package $100 VISA/MasterCard accepted add $1500 sh pp ng daho es add 5% Sa es tax Classic Glass PO Box 503 Blackfoot Idaho 83221-0503 Mike Zamber 208 785-2309 November 1988 175 fine tine kits ate machine cut sasist building reel show 80 has fully summetricel wing sections gives gresteat potential serobstic er upflght Inverted ship cspsble very slow close-In type flight right up robatic schedule can muster Classic Glass Grumman Wildcat B limEd ATIIE BEST IN ELECTRIC FLIGHT SPECIALIZING IH ASTRO FLIBHT SYSTEM -ENflI 111 ___________________________________________________ 1 I -RRl i 5l 1j CS Flight SgsteNs 31 Perrj Street Hiddlebero M 023483117 Phone 617947-2905 6 9 P H Go . Fredy Glow PIL 15 volt saliva lubricate knot pulled very tight small knots acting limit stops Cut off excess Coat rubber good grade rub ber lube install body tube push stick adequate length rear rubber support tube retained small rubberband shown photo Put two small rubberbands front end body tube behind little trian gles bands serves backnp difficult replace mo tor wound Cut short piece DT fuse slide snuffer tube use pair tweezers hold back wing mount rubberband sure positioned designed modernDealer hnuerle ported engines Dealer Inquiries Invited S Part Cam*ea% Auos 9w against fuse once latter place against snuffer tube Check center-of-gravity prop installed should balance rear spar bot tom surface wing off either direction little lead tape needed light end course out-of-balance situation can avoided entirely waiting until time glue pylon onto body Check Sparrow Hawk over warps wing tail steam out neces sary plan use model competi tion put AMA number right panel name address some plane Im usually eager go fly write AMA number black marking pen use mail address stickers name Since lost P-30s have returned maybe should also mention reward address label Flying Wait calm day test fly Before flying session lubricate prop shaft thin oil such sewing machine oil type comes neat pen cil dispenser fits nicely toolbox Test glide shim trim rear stab support until obtain slowest possi ble glide stalling Using winder put about 200 turns motor use various holes notches flagged safety pin see pho tos obvious Light DT fuse another piece fuse Never use match cigarette lighter light fuse air plane nitrate dope tissue al explosive WILLIAMS ACCESSORIES BROTHERS 4 PILOTS STANDARD TSMAN 0 RACING TAR VINTAGE TH CONTOUR BALLOON EN AGE 178 Model Aviation 10 Sparrow Hawk/ODwyer Continued page 175 HI-TECH ENCODER microprocessor based encoder board designed replace encoder board Futaba Conquest Ace Silver Seven transmitters compatible other AM FM radios market FEATURES complete calibration system use trimpots stores calibration constants four aircraft maintained during power off can mix first five channels other first five channels variety configoratiom exponential trim five strengtlss mixing expo trim can turned off during flight contrul trun throttle cntoff dual-rates servo reversing outputs four eight channels POWER REQUIREMENTS 32ma @ 96vdc SIZE 3 x45 x 75 inches SEND $400 installation operation manual oaly $17500 completely assembled tested encoder installation operation manual Please stare transmitter nwdel number channels Add $500 shipping handling EMULATION ELECTRONICS 2206 S Lynn Urbana 1L61801 217-344-8740or217-4697647 PARABELLUM 1975 July first issue 1976 197701982 197801983 1979-9-4-9641980-9--4-9&5198101986 i0 0 0 i0 Enclose separate $2200 check set ordered NO CASH NO CHARGES I I I I I r Print carefully shipping label II II Name II Street Addresa HStateZIP II Make checks payable AMA Send orders Academy Model Aeronautics 1810 Samuel Morse Dr Reston VA 22090 Linrnrn. urn urn ml Launch model positioning slightly nose up little left wind thrust line angles adequate model should gently climb right spiral about 10 seconds glide large left circle use short DT fuse forewarned Sparrow Hawk could startle disassembling itself air coming straight down plane does climb 200 turns flies much faster glide speed downthrust should reduced flight speed slow theres no climb try find some peppier rubber speed up right turn tight very lit tle climb reduce right thrust try again 200 turns Always use DT fuse simplest test flight things look good gradually increase number turns 650 700 about 500 turns will encounter so-called knee-in-the-torque curve sharply rapid rise potential power output Its zone Scale sport fliers tend give up win contest have keep trimming model zooms near-vertical 50 ft drops off right center-of-gravity should moved aft elevator angle reduced correct glide Dont change thrust line plane flew well 200 turns entire books have written adjusting Free Flight models theres still no substitute lot practice litfie experimenting own great deal can learned small model like P-30 anxiety worry associ ated flying bigger expensive After crashing P-30 wouldnt such big deal hold back optimal glide remember freewheel prop way out front de stabilizing influence functions gyro Therefore slower glide less effect prop will have Ill see next contest bring Sparrow Hawk well both have win ners Good luck Reno/Berliner Continued page 92 next year 1973 saw quite few rec ords overturned Lyle Shelton Wright R-3350-powered Bearcat turned time trials record 427 mph finals record 428 mph Formula Falck set qualifier record 235 mph Cote won finals 231 mph Among small field Sport Biplanes new all-metal Sundancer flown Sid White recordsetting 194 mph time trials 195 mph finals AT-6 time trials winner Jim Mott 211 mph Bill Turnbull took finals 207 mph 1974 Lyle Shelton came through another time trials record 432 mph Un limited bowed Ken Burnstine 382 mph finals hot ones dropped out Formula Ray Cote also scored record speeds 240 mph Name Street Address city State Zip HOBg RNATIONAL iNc November 1988 179 Modelers aioice High Quality Convenient Size Modest Price Jr Kwik Set Epoxy 5 OL $695 Gas Model Products 8773 Russet Dr Cincinnati OH 45239 dealer call 513-385-7398 order direct add *1 50 postage AMA INATONAII CENTENFOR Collectors Notice Just released AMA Museum BACK ISSUES Model Aviation magazinesNEW original car tons sale YEAR SETS ONLY Check selections below send SEPARATE $2200 CHECK individual set Orders will filled first-come basis set request sold out check will returned being cashed Limited Quantities Sets Are Complete L VIA