NO OCR TEXT NO OCR TEXT replicating particular design Original ity its strong suit Derived primarily Pik- 15 dash two other successful forerunners like Cap Laser Chipmunk RV-3 Akro its emi nently practical sport aircraft melds proven aerodynamic parameters very easy construction techniques Though its pace slower Pattern aircraft Prime Cut capable almost L access hatch cover wing bottom surface aileron control rod aileron controlled its own servo aerobatic maneuver Its steady re liable airplane takeoffs easy model can slowed down sufficiently achieve reasonably relaxed landings ever Prime Cut hardly trainer airplane big wing loading high pilot has really pay atten tion Id suggest model first step quarter-scale arena Its nice engine shots show complete access fiberglass cowl removed left close-up upside-down-mounted Quadra 40 engine 18-in prop 3-in CB plastic spinner ignition on-off switch mounted firewall handle protruding slightly through cowl photo right shows simple foam-and-tube structure fuselage exhaust system consist ing B&B muffler coupled lawn mower muffler reduce noise adapter consists two copper plumbing elbows brass tubing 26 Model Aviation view shows sleek lines big tail-dragger its tapered wing planform fully symmetrical airfoil covering Coverite Black Baron film Coverite graphics L Close-up canopy showing Wil liams Brothers -scale pilot complete dark glasses roll bar adding nice touch realism model canopy commercially available T&D Fiber glass Specialties Tinting black Tintex * view top center section wing shows 1/4-In plywood wing mounting key tongue used lieu common dowel arrangement author finds system easier install easier adjust good fit aileron servo lead seen extend ing wing Name address label wing suits AMA identification requirement ick Sarpolus N COWL PVY* DOW I. STRUCTURE3/3z BALSA &HEET OiE TECTFOAM CORE A &HEEI.j .- .___ -I 51- -- PLYL8HEET N - BALSA WING $1DDLE SQ BALSA BALSA BJOCJ / ALUMgPL 3/5 PL DOUBLiR SIG BRA&FOAM CORE LANDING CD GFAR CD 3/5BfL8ALE N 0 Co TI P& size airplanes apparent photo author left his friend Lou McGuire right showing off respective models Lous plane also powered Quadra 40 distinguished its Chipmunk-like trim scheme different canopy Lous airplane finished several months before authors benefited Lous flying experience Modifications incorporated landing gear based what Lou learned bottom shot wing off shows interior arrangement Four servos mounted side by-side across fuselage Two servos elevator control surface giving redundancy control power other two throttle rudder control Note use two lawn mower mufflers coupled B&B muffler attempt quiet large engine lack effective mufflers market large engines real problem change 40 60 size shipa bit challenge makes fun Construction sufficiently straightfor ward capable modelers will have no problems building supplies readily available fiberglass cowling wheel pants well plastic canopy available T&D Fiberglass alumi num landing gear Bravo unit Sig Manufacturing Co other hardware commercially available dont have local foam cutter foam cores can pur chased Robins Wing Balsa ply wood available locally through mail order suppliers surmise overall cost comparable less com mercial kit aircraft size friend Lou McGuire began work Prime Cut same time did Lou finished flying several months before Lous experience aircraft led us beef up landing gear mounting additional strength As shown plans has worked out well came time test fly Prime Cut knew little worry about Nevertheless took usual bundle photographs model before first flight though cant remember ever losing plane its debut always take RE/IFORCE FIRI FIBERGLASS COWL/ WITH FIBERBLM AIID EPOKY IIII III I III 11111 Ill' 'Ii IIII k4 TRIANGLEip TRIANGLE STOCKSTOCK FIBERBLASS COWL P1K-IS WHEEL PANTS NO IN AND PLASTIC CANOPY AVAILABLE FROM r o FIBERGLASS 30355 BLOCK GARDEN CITY NI 4B135 S I/B SPINNERS/SI BALSA TOP SECTID cI 91FUEL TANK Ic~I r~I ~II 41 IIi 4 - ~II I/BPLYBALSA QUADRA 55 OR 40ATTACi RECOMMENDEDWING 1/4 PLYWOOD LANDING BEAR MOUNTS FIBERGLASS WHEEL PANTS 4 I/I WHEELS photo record precautionary measure first flight uneventfuluntil midair After takeoff making few ele vator trim adjustments Lou executed some rolls loops snap rolls began making low passes photogra pher concentration must have tal because didnt notice other plane until too late heard crash watched helplessly pieces airplane flut tered through sky Interestingly other midair occurred less 30 minutes later plane surviving Prime Cut withstood impact well could expected Though radio engine survived wing tail surfaces could reused fuselage destroyed Im process construct ing new fuselage hope airborne again before long Still its just well took preflight photos Construction Prime Cuts structure follows conventional foam core design youre ready scratch-built project size youve probably already developed own preferred building techniques 28 Model Aviation Full-Size Plans Available. See Page 180 I/4 BALSA I4BALSA 3/G BALSA TOP FUSELAGE SHEETING NOT SHOWN IG PLYWOOD FUSELAGE STIFFENERIN THIS VIEW FOR CLARITYJ55 BALSA/ FIN/RLDGR TWO ELEVATON SERVOS WITH/K SEPARATE LINKAGE TO EACH ELEVATOR RECOMMENDED SQUAREI4BALSA RECEIVER SERVOS I /iI __-__ ii- _ I* IG BALSA IIG PLY DOUBLERIG BALSADOUBLERI/B PLYCB ASSOCIATES FUSELAGE SIDESTAIL WHEEL FUSELAGE SECTIONL4- SOTO HEREAND BOTTOMIM BALSAASSEMBLY ATTACHED TO WINGNYLON BOLTSTRIABBLE STOCK IB BALSA WING SADDLE PIECESMODEL AVIATION MAGAZINE PRIME CUT 10/N THE ACADEN OF MODEL AERONAUTICS FLY SAFELY AID QUIETLY O I5 5 4 B 67 BB ID II IS SPORTAEROBATIC AIRCRAFT FOR LARGER ENGINES DESIGNED AND DRAWN BY DICK SARPOLUS SHEET OF B cant find local source foam core cutting recommend Aerosmith Model Aviation RD #1 Box 290 Athens NY 12015 foam cores sheeted Y32 dium-weight balsa edge glued necessary needed width Ive used t2v Browns Southern Sorghum contact finished model wings shown supported simple foam block/cardboard tube assembly under landing gear keep weight off wheels airplane left standing prevents flat spots wheels canopy cowling wheel pants commercially available T&D Fiberglass Specialties landing gear can made up %2-in aluminum stock purchase Morrisey Bravo unit Sig Manufacturing Co cement years complete suc cess builders prefer using epoxy glue thinly applied 3M No 77 spray contact cement adhere skins September 1989 29 JJTK/F ii 11 1f4 PLYWOOD WING BOLT PLATE 00 Closeup bottom tuui nuwung CB Associates heavyduty leaf spring tail wheel assembly steering linkage tached rudder pushrod elevator pushrods Theres separate pushrod elevator devises pushrod ends heavyduty 440 size jam nuts keepers elevator devises /4 PLY WING NOUAT KEY WRAP CENTER SECT/ON Ii U9PLYWOOO A/ES I/4 PLYWOOD WINE MOUNT KEY \3/4 DOWEL TRIM FLUSN NTR NINE SWFACE DEPORE P/AERGLASS/NG I/A PLY 5 V5 PLY P/RE WALL 1/4 PLYWOOD 0 / S S S, cores Wing plywood wing mounting tongue substituted commonly used dowels wing positioning reinforced installing plywood rib root wing cores prefer mounting tongue dowels since contact area fuselage bulkhead retaining wing mount can trimmed shimmed necessary get correct wing-to-fuselage fit wing core sheeted top bottom trim off leading edge block Left shot catches aircraft climbs out its first takeoff Right its aerobatic capability undisputable dramatic photo Un fortunately lust moments later suffered midair collision extensively damaged fuselage completely replaced Prime Cut can mounted twin floats off-water flying fun foam core floats 48 x 6 have additional sheet aiuminum support strut bolted fuselage hind wing water rudder aft end float coupled aircraft rudder preparing lakeolT i ne auinor seems listening last-minute instructions Lou McGulre another member Jersey Coast Sportfliers Club just prior takeoff run tail wheel off ground Prime Cut just point smoothly lifting off Full-Size Plans Available. Page 180 SECT/ON Ar ROLASS CLOTH AND EPOXYLAYER OVER CENTER JO/NT J/N BALSA LEAD/NB EDGE SHEET WINO WITH -3/iS BALSA /NSTALL AILERON SERVOS IN WINO _____ WITH ACCESS RATCH ON BOTTOM SURFACE HOLE THROUGH FOAM CORE FOR SERVO EXTENSION CABLE ET COMPLETE WING W CUT AILERONS FREE FIN/SN EDGES I/B BALSA I\ Il 5/SB BALSA SHEETING CENTER LIRE I/U BALSA BULKHEADS ~ii 1/4 BALSA AILERON CROSS SECT/ON FOAM STABILIZER TEMPLATES USE HEAVY DI/TY N/RUES FOAM FIN/RWDER TEMPLATES 5/55 TEMPERED ALUM/MUM LARDING GEAR OR USE BIG MFG COS BRAVO LARDING GEAR hz FOAM WING CONE TEMPLATES BLOCK 11 I BALSA TIPS FOAM CORE FUSELAGE TOP BLOCK TEMPLATES 1/4 BALSA EDGES II J U I II PR/ME CUT SHEET S OF * sand square Add oversized leading edge strip plane sand shape wing tips sanded angle sheeted balsa easier sand ing tip blocks shape also produces lighter results Cut ailerons sheeted wing trim down allow balsa edges sand shape Hinge ailerons along centerline using large sturdy freely moving hingesand plenty Cut recesses lower wing surface aileron servo mounting installation aileron servo exten sion cables heat end piece A-in steel rod push through foam core root aileron servo location Removable hatches can stalled over servo areas Butt glue two wing halves wrap center joint wing heavy fiberglass cloth epoxy Use double layers cloth center Fuselage Select firm-to-hard balsa fuselage sides edge gluing splicing necessary achieve size required Glue /16 plywood doublers A-in plywood landing gear block reinforcements balsa wing saddle pieces stab saddle doublers balsa corner strips two fuselage sides before adding bulkheads Glue %-in plywood firewall next three bulkheads sides ing certain install perpendicular angle Glue second side three bulkheads sides parallel firewall wing trailing edge position Note A-in triangle stock used sides front plywood firewall -in triangle stock behind firewall Add A-in plywood wing bolt plate cockpit floor/fuselage reinforce ment piece Pull tail end together stall four rear bulkheads As certain fuselage sides taper straight line bulkhead beside wing trailing edge tail ensuring straight-cut foam top block will fit cor rectly Sheet foam fuselage top pieces /32 balsa Trim sheeting necessary glue place atop basic fuselage structure Reinforce firewall installation heavy fiberglass cloth epoxy ap plied over triangle stock behind fire wall also install several A-in-long No 4 screws through sides firewall extra security against vibration large gas engine can produce Large 8-32 blind nuts tee nuts installed firewall engine mounting bolts Add plywood landing gear mount forward bottom section fuselage Before adding fuselage bottom sheeting cut holes rear bulkheads eleva tor rudder pushrods usually wait until tail surfaces installed wing fitted fuselage before adding fuse lage bottom planlting Engine mount tail surfaces elevator stabilizer fin rudders fiberContinued page 138 September 1989 31 PRECISION MODEL PRODUCTS /ZIIflJ Made USA j7BARSTOCK ALUMINUM SPINNERS RetailAppros PriceWeight $1395058 oz 1495095oz 159510002 1695160oz 1895150oz 1895190oz 2095170or 2295220oz 2495200oz 2695260oz 2895250oz 3695340oz 4995470or 5995520oz 6995570or 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available tn Stzes Add $3 00 Per Sptnner PROP NUT ADAPTORS V Size . 1/4-28 28/7mm .6x1Omm 7x1Omm 5/1624.. 8x1Omm 8x12Smm 3/824 Approx Weight 061 061 or 063 or 082 076 076 02 076 075 sz 117 oz 115 02 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 / *ALL PARTS PRE-CUT & PREPAINTED O4/ BUILD & FLY IN TWO HOURS PAPER AIRPLANES 433 NIHOA STREET KAHULUI HI 96732 USA CATALOG $750 Contains 1000s paper airplanes postage stamp size 6 foot wing span Gliders rubber powered Diecut youcut Largest known source paper airplanes world Cost catalog deducted 1st order over $2500 ASTOUNDINGt CataLog AIR aL4plane aboue $1050 ptua $250 pohaga Letters Editor Continued page 12 sick 60 40 did fine job Keep up Homer Show young kids Beno Echerd South Padre Island TX Safety/Preston Continued page 22 associated gasoline-filled fuel cans let ter did catch eye dated September 1986 came Ernest Razzano li censed A&E mechanic 50 years experi ence Ernies letter responded article previ ous Safety column concerning hazard hav ing fuel cans batteries close proximity sent photos flight box using did use automotive fuel pump dis pense gasoline However Ernie has battery powering fuel pump located separate flight box also houses electric starter phone jack battery box used make electrical connection would welcome letters opinions pro con use electric pumps dispens ing gasoline models particular besides Ernie Razzano using automotive fuel pumps purpose would care tell us about setup Before leaving subject fuel fires/explo sions Jim Baxter Spokane WA sent news paper clipping headline Arson Sus pected Hobby Shop Fire Jim highlighted segment clipping stated 30 50 gallons methanol-based model airplane fuel stored building did ex plode letter Jim commented Since store totally gutted suspect fuel en hanced intensity fire Im sure did reason mentioning newspaper ac count question whether fuel stored metal cans safer plastic jugs guess fuel hobby shop plastic jugs melted allowed fuel burn cans metal its guess may well have exploded Any comments safety metal versus plastic fuel storage containers will welcome responding advertisers mention read about ModelAvlatlon Prime Cut/Sarpolus Continued page 31 glass cowl must trimmed necessary clear engine cylinder Mount cowl using four nylon bolts fit holes tapped fuse lage sides Tap holes A-in plywood aluminum landing gear held place A-in nylon bolts tail surface foam cores also sheeted %2 balsa Cut sheeting apart along hinge lines trim back allow added balsa edging Join horizontal stabilizer halves reinforcing fiberglass cloth epoxy Glue stabilizer fuselage elevators controlled its own servo pushrod Glue vertical fin place rudder linkage via pushrod cables tail wheel steering linked rudder small springs Balsa blocks must shaped installed behind fu selage top pieces side fin recess surfaces accept A-in plywood pieces nylon horns mounted control surfaces ailerons elevators rudder horns retained self-tapping sheet metal screws Epoxy plywood mounts control surfaces recommend using larger 4-40 threaded rods devises linkages Fiberglass tube pushrods used elevator linkages use iAin plywood servo mounts fuse lage Using separate servos elevators its own pushrod allows pushrods perfectly straight Since pushrods cross over within fuselage elevator servos mounted % higher other keep two pushrods rubbing together made up aileron extension cables Y harness two aileron servos mounted wing 1200 mAh battery pack used wrapped foam rubber positioned re cess cut foam fuselage top block bat tery pack can located behind wing posi tion necessary balance Landing gear tail wheel assembly can opy sheet aluminum landing gear can cut %2 aluminum stock available use Morrissey Bravo landing gear Sig Manufac turing Co secured T&D Fiberglass wheel pants inserting two screws through alumi num gear plywood block epoxied inside wheel pants Alternatively Sig B&B Special ties stock mounts wheel collar type leaf-spring tail wheel assembly heavy-duty model CB Associates 16oz fuel tank used space available 138 Model Aviation Paper Flying Scale Model Airplane $700 Part No IT-iSO-B fl175-B fl200B T1-225-B T1-226-B 11-250-B 11-25 1-B 11-275-B 11276-B 11300-B 11301-B 11-325-B 11-350-B 11375-8 TT-400-B Sire .. 1112 .. 13/4 .. 21/4 .. 21/4 FAt .. 21/2 2-1/2FAI . 2314 2314 FAt FAI .. 31/4 3112 . 3-314 . 4 Part No 11140-A TI 147A TT6 10-A TT-7 10-A TI- 516-A IT- 518-A TT-8 10-A 11-825-A IT- 375-A IT- 125-A Retail Price $495 495 495 495 495 495 495 495 595 595 another 16-oz tank smoke system de sired order keep ignition cutoff switch front firewall mounted sheet metal right angle bracket switch han dle protrudes slightly through slot cut fi bergiass cowl receiver antenna pushed nylon tube glued inside fuselage run ning back toward tail Finding large enough plastic bubble canopy aircraft like isnt easy T&D Fiber glass Specialties about source know large canopies might also try kit man ufacturers include large aircraft lines since will usually sell canopies sep arately shape canopy greatly influenc es general appearance type design its important find like Several canopies sold T&D Fiber glass suitable Note version shown plans differs used proto type photos canopy plans basically military style ver sion photos appropriate lightplane home-built aircraft Contact T&D de tails preference tint canopy shows up well use black Tintex dye warm water prevent distorting canopy shape few hours dye bath necessary achieve desired tint Use container large enough fully immerse canopy uniform result black plastic molding used lower edge provides finished appearance canopy attached four screws ply wood tabs glued fuselage top roll bar structure -in doweling quarter-scale-size pilot figure cockpit cut out add realism Propeller muffler cut hole through cowl permit choking carburetor other hole access carb needle valves B&B muffler fitted Quadra Lets face though B&B nearly other nominal muffler available Quadra does little actual muffling solution coupling $295 lawn mower muffler exhaust outlets using homemade adapter quieted things down considerably mower muffler neither too big nor excessively heavy its practical use two dual exhausts added mufflers mounted externally fuselage bottom positioned below landing gear course dont want hang con traptions nice clean aircraftbut theyll job until somebody makes true muffler larger engines reasonably muffled engines much noise comes propel ler As efforts other club members have shown noise level definitely affected shape prop tips Rounded pointed tips produce less noise Ive heard lot gas engine fliers engines produce lower-pitch noise eliminating need addi tional muffling achieving realistic sound general public noise noise Lets keep em quiet used 3/2-in P-SI plastic spinner CB Though looks quite attractive find myself picturing Tru-Turn machined aluminum spinner would look instead now com pany offering larger sizes polished aluminum unit would costly would certainly add pro pizzazz thats hard re sist Covering finishing Plastic film covering accepted norm todays modelers film easier faster apply contrib utes vast weight saving Its quite since put painted finish sport aircraft really dont miss fun doing good paint job used Coverites Black Baron film Prime Cut material new quarter-scale plane built-up structure Per magloss Super Coverite would contribute added strength totally sheeted foamcored model like Prime Cut knew plastic film would work fine Black Baron film requires lower heat set ting application Id previously used 20-year-old-plus heat sealing iron couldnt turned down low enough bought Coverite Black Baron iron pocket thermometers exact monitoring temperature Blackstone coating iron makes nice slippery Its lot easier use old iron lacked coating Using Coverite thermometer found setting around 225 0F worked best allover application film chose basic red-andwhite covering scheme overlapped film about /2 seams Black Baron easy apply showing little tendency bubble soft cloth used rub down bubbles assure total adhesion trimmed white areas blue stripe cut metal straightedge razor blade Black Baron film Positioning care fully ironed stripe place no trouble ironing stretching Black Baron ma terial particularly easy apply around com pound curves such tips tail surfaces Planning use red blue stars trim em phasis picked up some Coverite Graphics Trim Sheets purpose trim sheet material press-on adhesive backed simply pressed place after being cut desired shape Continued page 142 September 1989 139 SPECIALISTS IN CUSTOM COX TEE DEE & REED ENGINES O2OS 0495 051S074S& 09S ALL CUS TOM & STOCK PARTS VAILABLE INDIVIDUALLY COMPETITION ACCESSORIES & CUSTOMIZED K&B ENGINES RACING WHEELS KLOTZ OIL CARBON FIBER SOLID LINES ALL KINDS OF FUEL TUBING FOUR BRANDS OFGLOWPLUGS HA RD-TO-FIND HARD WARE OLD TIMER SUPPLIES COILS CONDENSERS NGK & STIlT SPARK PLUGS SILK 12 COLORS QUALITY DOPE BRUSHES 5& 7LOOP 1/4RUBBER BANDS TRANSISTOR IGNITION SYSTEMS RESISTOR HIGH TENSION LEADS 1/2A TEXACO PLA YBOY SR KIT 1/2A TEXACO ENGINES & PARTS KSB & IGNITION TIMERS RUBBER POWER KITS PROPS TISSUE AND OTHER SUPPLIES CYANOACRYLA TES & EPOXIES ORDER BY MAIL OR PHONE 019 729-4395 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING & HANDLING FEE $200 FOR INSURANCE ADD $100 STOCK ORDERS SHIPPED WITHIN 24 HRS Idle-Bar Glow Plugs Long Shortoniy $1 89 Also. Traditional line non-idle bar Glow Plugs Six Types 3 Heat Ranges High Performance Glow Element Blow Proof Seal Only $149 Swanson Associates PO Box 151 Wayne NJ nce 784a 07470 r PO Box 16621 Dept M Irvine CA 92714 714 250-1107 h. Prime Cut/Sarpolus Continued page 139 However found easier way Coverite offers die-cut sheet stars package containing 62 stars four sizes purchased pack red blue stars lifted off put air plane really easy trimming job Im sold Black Baron film Coverite also offers Black Baron epoxy paint colors match film its available spray cans would good choice fi berglass cowl wheel pants Flying Prime Cut solid stable flier thats nice responsive want wring out youre used flying larger air craft youll need literally adjust sights model appears same size sky smaller would youre flying too far out made lot faraway landings bigger models until learned gauge distance accurately bring closer Large aircraft quite stable landing ap proaches dont bounce around Bleed off speed bring model set plane down gently Aerobatics fun Prime Cut maneuvers require certain amount thought piloting skill cant horse around airplane would Ugly Stik smoke system definitely adds special air show appearance Treat big ones plenty respect thoughan 18-in prop big piece lumber can real damage Always have helper hanging behind aircraft start engine run up Safe flying watchword Radio Technique/Myers Continued page 33 Advanced Unlimited contestant except Basic category con structs figures FAT-CAT elements Free Program Thus figure commonly called Immelmann consists half-loop up ward entered upright level flight 721 K lf-roll exit upright level flight 9l32K4foratotalK l0Thedecimal numbers parentheses FAI-CAT numbers locate particular elements catalog corresponding K-factors Figures judged IAC competition elements no limit number elements can combined create figure long can keep within TACs Acrobatic Zone measures 3300 ft square 3500 ft above ground level AGL top zone 3280 ft AGL Unlimited cate gory bottom zone 1500 ft AGL Basic Sportsman 1200 ft AGL Intermediate 800 ft AGL Ad vanced 328 ft AGL Unlimited An TAC sequence list figures per formed sequentially during trip through Aerobatic Zone has sum K-factors appro priate category being flown order someone ground able judge well flier performs Free Pro gram flier must write paper performed IAC provides forms B C purpose Some judge must check competitors Free Program Forms B C before event involves lot work FAI-CAT adding machinefor both judge competitor Thats reason judges have familiar FAI-CAT TAC categories must fly Known Compul sory sequences made up cat egory published yearly IAC diffi culty flying Known Compulsory sequence increases Basic Unlimited first flight event competitor Known Compulsory also qualifying flight majority judges votes competi tor has demonstrated ability safely control aircraft disqualified category AMA could likewise Let digress Model Aviations Compe tition Newsletter section June 1989 issue pages 139-140 moment will find description IMAC International Miniature Aerobatics Club its compulsory sequences 1989 Aresti diagrams given names figures K factors can see what am discussing has used RC model world since 1974 Its new havent heard about before Now back airplanes can sit IAC has no compulsory advancements category competitors category pilot flies some what dependent airplane because air planes too weak structurally lack suffi cient power perform Advanced Unlimited category figures Intermediate Advanced Unlimited catego ries must also fly Unknown Compulsory Pro gram Unknown Compulsory constructed IAC headquarters supplied contest organizers particular contest Now come peculiarity Only pilots Unlimited category allowed perform Graded Unlimited Four-Minute Free Program program judged Originality K ersatility K armony & Rhythm K xecution K so done OUR REV-UP INVENTORY VERA GES OVER 9000 PROPS ii IMMEDIATE SHIPMENT ON VISAIMC CARBON FIBER LAMINATES Aerospace Composite Products offers variety rigid carbon fiber/epoxy sheets add stiffness almost material- fiberglass foam bal sawood laminates can used reinforce foam wings leading trailing edges wing spars Carbon Fiber bonds easily slow setting cyanoacrylates 5-minute epoxies laminate can stripped narrower widths CL-i 007 thick 1x48-$500 1x72-$700 CL-2 014 thick 1x48-$800 1x72-$1100 Send SASE information additional sizes products Add S300 shipping handling Calif residents add 6% tax Overseas orders add 15%-Order COD send check money order w r41 1nh1z VIIIIIII 1It5iIIIII51I source lightweight materials
Edition: Model Aviation - 1989/09
Page Numbers: 24, 25, 26, 27, 28, 29, 30, 31, 138, 139, 142
NO OCR TEXT NO OCR TEXT replicating particular design Original ity its strong suit Derived primarily Pik- 15 dash two other successful forerunners like Cap Laser Chipmunk RV-3 Akro its emi nently practical sport aircraft melds proven aerodynamic parameters very easy construction techniques Though its pace slower Pattern aircraft Prime Cut capable almost L access hatch cover wing bottom surface aileron control rod aileron controlled its own servo aerobatic maneuver Its steady re liable airplane takeoffs easy model can slowed down sufficiently achieve reasonably relaxed landings ever Prime Cut hardly trainer airplane big wing loading high pilot has really pay atten tion Id suggest model first step quarter-scale arena Its nice engine shots show complete access fiberglass cowl removed left close-up upside-down-mounted Quadra 40 engine 18-in prop 3-in CB plastic spinner ignition on-off switch mounted firewall handle protruding slightly through cowl photo right shows simple foam-and-tube structure fuselage exhaust system consist ing B&B muffler coupled lawn mower muffler reduce noise adapter consists two copper plumbing elbows brass tubing 26 Model Aviation view shows sleek lines big tail-dragger its tapered wing planform fully symmetrical airfoil covering Coverite Black Baron film Coverite graphics L Close-up canopy showing Wil liams Brothers -scale pilot complete dark glasses roll bar adding nice touch realism model canopy commercially available T&D Fiber glass Specialties Tinting black Tintex * view top center section wing shows 1/4-In plywood wing mounting key tongue used lieu common dowel arrangement author finds system easier install easier adjust good fit aileron servo lead seen extend ing wing Name address label wing suits AMA identification requirement ick Sarpolus N COWL PVY* DOW I. STRUCTURE3/3z BALSA &HEET OiE TECTFOAM CORE A &HEEI.j .- .___ -I 51- -- PLYL8HEET N - BALSA WING $1DDLE SQ BALSA BALSA BJOCJ / ALUMgPL 3/5 PL DOUBLiR SIG BRA&FOAM CORE LANDING CD GFAR CD 3/5BfL8ALE N 0 Co TI P& size airplanes apparent photo author left his friend Lou McGuire right showing off respective models Lous plane also powered Quadra 40 distinguished its Chipmunk-like trim scheme different canopy Lous airplane finished several months before authors benefited Lous flying experience Modifications incorporated landing gear based what Lou learned bottom shot wing off shows interior arrangement Four servos mounted side by-side across fuselage Two servos elevator control surface giving redundancy control power other two throttle rudder control Note use two lawn mower mufflers coupled B&B muffler attempt quiet large engine lack effective mufflers market large engines real problem change 40 60 size shipa bit challenge makes fun Construction sufficiently straightfor ward capable modelers will have no problems building supplies readily available fiberglass cowling wheel pants well plastic canopy available T&D Fiberglass alumi num landing gear Bravo unit Sig Manufacturing Co other hardware commercially available dont have local foam cutter foam cores can pur chased Robins Wing Balsa ply wood available locally through mail order suppliers surmise overall cost comparable less com mercial kit aircraft size friend Lou McGuire began work Prime Cut same time did Lou finished flying several months before Lous experience aircraft led us beef up landing gear mounting additional strength As shown plans has worked out well came time test fly Prime Cut knew little worry about Nevertheless took usual bundle photographs model before first flight though cant remember ever losing plane its debut always take RE/IFORCE FIRI FIBERGLASS COWL/ WITH FIBERBLM AIID EPOKY IIII III I III 11111 Ill' 'Ii IIII k4 TRIANGLEip TRIANGLE STOCKSTOCK FIBERBLASS COWL P1K-IS WHEEL PANTS NO IN AND PLASTIC CANOPY AVAILABLE FROM r o FIBERGLASS 30355 BLOCK GARDEN CITY NI 4B135 S I/B SPINNERS/SI BALSA TOP SECTID cI 91FUEL TANK Ic~I r~I ~II 41 IIi 4 - ~II I/BPLYBALSA QUADRA 55 OR 40ATTACi RECOMMENDEDWING 1/4 PLYWOOD LANDING BEAR MOUNTS FIBERGLASS WHEEL PANTS 4 I/I WHEELS photo record precautionary measure first flight uneventfuluntil midair After takeoff making few ele vator trim adjustments Lou executed some rolls loops snap rolls began making low passes photogra pher concentration must have tal because didnt notice other plane until too late heard crash watched helplessly pieces airplane flut tered through sky Interestingly other midair occurred less 30 minutes later plane surviving Prime Cut withstood impact well could expected Though radio engine survived wing tail surfaces could reused fuselage destroyed Im process construct ing new fuselage hope airborne again before long Still its just well took preflight photos Construction Prime Cuts structure follows conventional foam core design youre ready scratch-built project size youve probably already developed own preferred building techniques 28 Model Aviation Full-Size Plans Available. See Page 180 I/4 BALSA I4BALSA 3/G BALSA TOP FUSELAGE SHEETING NOT SHOWN IG PLYWOOD FUSELAGE STIFFENERIN THIS VIEW FOR CLARITYJ55 BALSA/ FIN/RLDGR TWO ELEVATON SERVOS WITH/K SEPARATE LINKAGE TO EACH ELEVATOR RECOMMENDED SQUAREI4BALSA RECEIVER SERVOS I /iI __-__ ii- _ I* IG BALSA IIG PLY DOUBLERIG BALSADOUBLERI/B PLYCB ASSOCIATES FUSELAGE SIDESTAIL WHEEL FUSELAGE SECTIONL4- SOTO HEREAND BOTTOMIM BALSAASSEMBLY ATTACHED TO WINGNYLON BOLTSTRIABBLE STOCK IB BALSA WING SADDLE PIECESMODEL AVIATION MAGAZINE PRIME CUT 10/N THE ACADEN OF MODEL AERONAUTICS FLY SAFELY AID QUIETLY O I5 5 4 B 67 BB ID II IS SPORTAEROBATIC AIRCRAFT FOR LARGER ENGINES DESIGNED AND DRAWN BY DICK SARPOLUS SHEET OF B cant find local source foam core cutting recommend Aerosmith Model Aviation RD #1 Box 290 Athens NY 12015 foam cores sheeted Y32 dium-weight balsa edge glued necessary needed width Ive used t2v Browns Southern Sorghum contact finished model wings shown supported simple foam block/cardboard tube assembly under landing gear keep weight off wheels airplane left standing prevents flat spots wheels canopy cowling wheel pants commercially available T&D Fiberglass Specialties landing gear can made up %2-in aluminum stock purchase Morrisey Bravo unit Sig Manufacturing Co cement years complete suc cess builders prefer using epoxy glue thinly applied 3M No 77 spray contact cement adhere skins September 1989 29 JJTK/F ii 11 1f4 PLYWOOD WING BOLT PLATE 00 Closeup bottom tuui nuwung CB Associates heavyduty leaf spring tail wheel assembly steering linkage tached rudder pushrod elevator pushrods Theres separate pushrod elevator devises pushrod ends heavyduty 440 size jam nuts keepers elevator devises /4 PLY WING NOUAT KEY WRAP CENTER SECT/ON Ii U9PLYWOOO A/ES I/4 PLYWOOD WINE MOUNT KEY \3/4 DOWEL TRIM FLUSN NTR NINE SWFACE DEPORE P/AERGLASS/NG I/A PLY 5 V5 PLY P/RE WALL 1/4 PLYWOOD 0 / S S S, cores Wing plywood wing mounting tongue substituted commonly used dowels wing positioning reinforced installing plywood rib root wing cores prefer mounting tongue dowels since contact area fuselage bulkhead retaining wing mount can trimmed shimmed necessary get correct wing-to-fuselage fit wing core sheeted top bottom trim off leading edge block Left shot catches aircraft climbs out its first takeoff Right its aerobatic capability undisputable dramatic photo Un fortunately lust moments later suffered midair collision extensively damaged fuselage completely replaced Prime Cut can mounted twin floats off-water flying fun foam core floats 48 x 6 have additional sheet aiuminum support strut bolted fuselage hind wing water rudder aft end float coupled aircraft rudder preparing lakeolT i ne auinor seems listening last-minute instructions Lou McGulre another member Jersey Coast Sportfliers Club just prior takeoff run tail wheel off ground Prime Cut just point smoothly lifting off Full-Size Plans Available. Page 180 SECT/ON Ar ROLASS CLOTH AND EPOXYLAYER OVER CENTER JO/NT J/N BALSA LEAD/NB EDGE SHEET WINO WITH -3/iS BALSA /NSTALL AILERON SERVOS IN WINO _____ WITH ACCESS RATCH ON BOTTOM SURFACE HOLE THROUGH FOAM CORE FOR SERVO EXTENSION CABLE ET COMPLETE WING W CUT AILERONS FREE FIN/SN EDGES I/B BALSA I\ Il 5/SB BALSA SHEETING CENTER LIRE I/U BALSA BULKHEADS ~ii 1/4 BALSA AILERON CROSS SECT/ON FOAM STABILIZER TEMPLATES USE HEAVY DI/TY N/RUES FOAM FIN/RWDER TEMPLATES 5/55 TEMPERED ALUM/MUM LARDING GEAR OR USE BIG MFG COS BRAVO LARDING GEAR hz FOAM WING CONE TEMPLATES BLOCK 11 I BALSA TIPS FOAM CORE FUSELAGE TOP BLOCK TEMPLATES 1/4 BALSA EDGES II J U I II PR/ME CUT SHEET S OF * sand square Add oversized leading edge strip plane sand shape wing tips sanded angle sheeted balsa easier sand ing tip blocks shape also produces lighter results Cut ailerons sheeted wing trim down allow balsa edges sand shape Hinge ailerons along centerline using large sturdy freely moving hingesand plenty Cut recesses lower wing surface aileron servo mounting installation aileron servo exten sion cables heat end piece A-in steel rod push through foam core root aileron servo location Removable hatches can stalled over servo areas Butt glue two wing halves wrap center joint wing heavy fiberglass cloth epoxy Use double layers cloth center Fuselage Select firm-to-hard balsa fuselage sides edge gluing splicing necessary achieve size required Glue /16 plywood doublers A-in plywood landing gear block reinforcements balsa wing saddle pieces stab saddle doublers balsa corner strips two fuselage sides before adding bulkheads Glue %-in plywood firewall next three bulkheads sides ing certain install perpendicular angle Glue second side three bulkheads sides parallel firewall wing trailing edge position Note A-in triangle stock used sides front plywood firewall -in triangle stock behind firewall Add A-in plywood wing bolt plate cockpit floor/fuselage reinforce ment piece Pull tail end together stall four rear bulkheads As certain fuselage sides taper straight line bulkhead beside wing trailing edge tail ensuring straight-cut foam top block will fit cor rectly Sheet foam fuselage top pieces /32 balsa Trim sheeting necessary glue place atop basic fuselage structure Reinforce firewall installation heavy fiberglass cloth epoxy ap plied over triangle stock behind fire wall also install several A-in-long No 4 screws through sides firewall extra security against vibration large gas engine can produce Large 8-32 blind nuts tee nuts installed firewall engine mounting bolts Add plywood landing gear mount forward bottom section fuselage Before adding fuselage bottom sheeting cut holes rear bulkheads eleva tor rudder pushrods usually wait until tail surfaces installed wing fitted fuselage before adding fuse lage bottom planlting Engine mount tail surfaces elevator stabilizer fin rudders fiberContinued page 138 September 1989 31 PRECISION MODEL PRODUCTS /ZIIflJ Made USA j7BARSTOCK ALUMINUM SPINNERS RetailAppros PriceWeight $1395058 oz 1495095oz 159510002 1695160oz 1895150oz 1895190oz 2095170or 2295220oz 2495200oz 2695260oz 2895250oz 3695340oz 4995470or 5995520oz 6995570or 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available tn Stzes Add $3 00 Per Sptnner PROP NUT ADAPTORS V Size . 1/4-28 28/7mm .6x1Omm 7x1Omm 5/1624.. 8x1Omm 8x12Smm 3/824 Approx Weight 061 061 or 063 or 082 076 076 02 076 075 sz 117 oz 115 02 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 / *ALL PARTS PRE-CUT & PREPAINTED O4/ BUILD & FLY IN TWO HOURS PAPER AIRPLANES 433 NIHOA STREET KAHULUI HI 96732 USA CATALOG $750 Contains 1000s paper airplanes postage stamp size 6 foot wing span Gliders rubber powered Diecut youcut Largest known source paper airplanes world Cost catalog deducted 1st order over $2500 ASTOUNDINGt CataLog AIR aL4plane aboue $1050 ptua $250 pohaga Letters Editor Continued page 12 sick 60 40 did fine job Keep up Homer Show young kids Beno Echerd South Padre Island TX Safety/Preston Continued page 22 associated gasoline-filled fuel cans let ter did catch eye dated September 1986 came Ernest Razzano li censed A&E mechanic 50 years experi ence Ernies letter responded article previ ous Safety column concerning hazard hav ing fuel cans batteries close proximity sent photos flight box using did use automotive fuel pump dis pense gasoline However Ernie has battery powering fuel pump located separate flight box also houses electric starter phone jack battery box used make electrical connection would welcome letters opinions pro con use electric pumps dispens ing gasoline models particular besides Ernie Razzano using automotive fuel pumps purpose would care tell us about setup Before leaving subject fuel fires/explo sions Jim Baxter Spokane WA sent news paper clipping headline Arson Sus pected Hobby Shop Fire Jim highlighted segment clipping stated 30 50 gallons methanol-based model airplane fuel stored building did ex plode letter Jim commented Since store totally gutted suspect fuel en hanced intensity fire Im sure did reason mentioning newspaper ac count question whether fuel stored metal cans safer plastic jugs guess fuel hobby shop plastic jugs melted allowed fuel burn cans metal its guess may well have exploded Any comments safety metal versus plastic fuel storage containers will welcome responding advertisers mention read about ModelAvlatlon Prime Cut/Sarpolus Continued page 31 glass cowl must trimmed necessary clear engine cylinder Mount cowl using four nylon bolts fit holes tapped fuse lage sides Tap holes A-in plywood aluminum landing gear held place A-in nylon bolts tail surface foam cores also sheeted %2 balsa Cut sheeting apart along hinge lines trim back allow added balsa edging Join horizontal stabilizer halves reinforcing fiberglass cloth epoxy Glue stabilizer fuselage elevators controlled its own servo pushrod Glue vertical fin place rudder linkage via pushrod cables tail wheel steering linked rudder small springs Balsa blocks must shaped installed behind fu selage top pieces side fin recess surfaces accept A-in plywood pieces nylon horns mounted control surfaces ailerons elevators rudder horns retained self-tapping sheet metal screws Epoxy plywood mounts control surfaces recommend using larger 4-40 threaded rods devises linkages Fiberglass tube pushrods used elevator linkages use iAin plywood servo mounts fuse lage Using separate servos elevators its own pushrod allows pushrods perfectly straight Since pushrods cross over within fuselage elevator servos mounted % higher other keep two pushrods rubbing together made up aileron extension cables Y harness two aileron servos mounted wing 1200 mAh battery pack used wrapped foam rubber positioned re cess cut foam fuselage top block bat tery pack can located behind wing posi tion necessary balance Landing gear tail wheel assembly can opy sheet aluminum landing gear can cut %2 aluminum stock available use Morrissey Bravo landing gear Sig Manufac turing Co secured T&D Fiberglass wheel pants inserting two screws through alumi num gear plywood block epoxied inside wheel pants Alternatively Sig B&B Special ties stock mounts wheel collar type leaf-spring tail wheel assembly heavy-duty model CB Associates 16oz fuel tank used space available 138 Model Aviation Paper Flying Scale Model Airplane $700 Part No IT-iSO-B fl175-B fl200B T1-225-B T1-226-B 11-250-B 11-25 1-B 11-275-B 11276-B 11300-B 11301-B 11-325-B 11-350-B 11375-8 TT-400-B Sire .. 1112 .. 13/4 .. 21/4 .. 21/4 FAt .. 21/2 2-1/2FAI . 2314 2314 FAt FAI .. 31/4 3112 . 3-314 . 4 Part No 11140-A TI 147A TT6 10-A TT-7 10-A TI- 516-A IT- 518-A TT-8 10-A 11-825-A IT- 375-A IT- 125-A Retail Price $495 495 495 495 495 495 495 495 595 595 another 16-oz tank smoke system de sired order keep ignition cutoff switch front firewall mounted sheet metal right angle bracket switch han dle protrudes slightly through slot cut fi bergiass cowl receiver antenna pushed nylon tube glued inside fuselage run ning back toward tail Finding large enough plastic bubble canopy aircraft like isnt easy T&D Fiber glass Specialties about source know large canopies might also try kit man ufacturers include large aircraft lines since will usually sell canopies sep arately shape canopy greatly influenc es general appearance type design its important find like Several canopies sold T&D Fiber glass suitable Note version shown plans differs used proto type photos canopy plans basically military style ver sion photos appropriate lightplane home-built aircraft Contact T&D de tails preference tint canopy shows up well use black Tintex dye warm water prevent distorting canopy shape few hours dye bath necessary achieve desired tint Use container large enough fully immerse canopy uniform result black plastic molding used lower edge provides finished appearance canopy attached four screws ply wood tabs glued fuselage top roll bar structure -in doweling quarter-scale-size pilot figure cockpit cut out add realism Propeller muffler cut hole through cowl permit choking carburetor other hole access carb needle valves B&B muffler fitted Quadra Lets face though B&B nearly other nominal muffler available Quadra does little actual muffling solution coupling $295 lawn mower muffler exhaust outlets using homemade adapter quieted things down considerably mower muffler neither too big nor excessively heavy its practical use two dual exhausts added mufflers mounted externally fuselage bottom positioned below landing gear course dont want hang con traptions nice clean aircraftbut theyll job until somebody makes true muffler larger engines reasonably muffled engines much noise comes propel ler As efforts other club members have shown noise level definitely affected shape prop tips Rounded pointed tips produce less noise Ive heard lot gas engine fliers engines produce lower-pitch noise eliminating need addi tional muffling achieving realistic sound general public noise noise Lets keep em quiet used 3/2-in P-SI plastic spinner CB Though looks quite attractive find myself picturing Tru-Turn machined aluminum spinner would look instead now com pany offering larger sizes polished aluminum unit would costly would certainly add pro pizzazz thats hard re sist Covering finishing Plastic film covering accepted norm todays modelers film easier faster apply contrib utes vast weight saving Its quite since put painted finish sport aircraft really dont miss fun doing good paint job used Coverites Black Baron film Prime Cut material new quarter-scale plane built-up structure Per magloss Super Coverite would contribute added strength totally sheeted foamcored model like Prime Cut knew plastic film would work fine Black Baron film requires lower heat set ting application Id previously used 20-year-old-plus heat sealing iron couldnt turned down low enough bought Coverite Black Baron iron pocket thermometers exact monitoring temperature Blackstone coating iron makes nice slippery Its lot easier use old iron lacked coating Using Coverite thermometer found setting around 225 0F worked best allover application film chose basic red-andwhite covering scheme overlapped film about /2 seams Black Baron easy apply showing little tendency bubble soft cloth used rub down bubbles assure total adhesion trimmed white areas blue stripe cut metal straightedge razor blade Black Baron film Positioning care fully ironed stripe place no trouble ironing stretching Black Baron ma terial particularly easy apply around com pound curves such tips tail surfaces Planning use red blue stars trim em phasis picked up some Coverite Graphics Trim Sheets purpose trim sheet material press-on adhesive backed simply pressed place after being cut desired shape Continued page 142 September 1989 139 SPECIALISTS IN CUSTOM COX TEE DEE & REED ENGINES O2OS 0495 051S074S& 09S ALL CUS TOM & STOCK PARTS VAILABLE INDIVIDUALLY COMPETITION ACCESSORIES & CUSTOMIZED K&B ENGINES RACING WHEELS KLOTZ OIL CARBON FIBER SOLID LINES ALL KINDS OF FUEL TUBING FOUR BRANDS OFGLOWPLUGS HA RD-TO-FIND HARD WARE OLD TIMER SUPPLIES COILS CONDENSERS NGK & STIlT SPARK PLUGS SILK 12 COLORS QUALITY DOPE BRUSHES 5& 7LOOP 1/4RUBBER BANDS TRANSISTOR IGNITION SYSTEMS RESISTOR HIGH TENSION LEADS 1/2A TEXACO PLA YBOY SR KIT 1/2A TEXACO ENGINES & PARTS KSB & IGNITION TIMERS RUBBER POWER KITS PROPS TISSUE AND OTHER SUPPLIES CYANOACRYLA TES & EPOXIES ORDER BY MAIL OR PHONE 019 729-4395 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING & HANDLING FEE $200 FOR INSURANCE ADD $100 STOCK ORDERS SHIPPED WITHIN 24 HRS Idle-Bar Glow Plugs Long Shortoniy $1 89 Also. Traditional line non-idle bar Glow Plugs Six Types 3 Heat Ranges High Performance Glow Element Blow Proof Seal Only $149 Swanson Associates PO Box 151 Wayne NJ nce 784a 07470 r PO Box 16621 Dept M Irvine CA 92714 714 250-1107 h. Prime Cut/Sarpolus Continued page 139 However found easier way Coverite offers die-cut sheet stars package containing 62 stars four sizes purchased pack red blue stars lifted off put air plane really easy trimming job Im sold Black Baron film Coverite also offers Black Baron epoxy paint colors match film its available spray cans would good choice fi berglass cowl wheel pants Flying Prime Cut solid stable flier thats nice responsive want wring out youre used flying larger air craft youll need literally adjust sights model appears same size sky smaller would youre flying too far out made lot faraway landings bigger models until learned gauge distance accurately bring closer Large aircraft quite stable landing ap proaches dont bounce around Bleed off speed bring model set plane down gently Aerobatics fun Prime Cut maneuvers require certain amount thought piloting skill cant horse around airplane would Ugly Stik smoke system definitely adds special air show appearance Treat big ones plenty respect thoughan 18-in prop big piece lumber can real damage Always have helper hanging behind aircraft start engine run up Safe flying watchword Radio Technique/Myers Continued page 33 Advanced Unlimited contestant except Basic category con structs figures FAT-CAT elements Free Program Thus figure commonly called Immelmann consists half-loop up ward entered upright level flight 721 K lf-roll exit upright level flight 9l32K4foratotalK l0Thedecimal numbers parentheses FAI-CAT numbers locate particular elements catalog corresponding K-factors Figures judged IAC competition elements no limit number elements can combined create figure long can keep within TACs Acrobatic Zone measures 3300 ft square 3500 ft above ground level AGL top zone 3280 ft AGL Unlimited cate gory bottom zone 1500 ft AGL Basic Sportsman 1200 ft AGL Intermediate 800 ft AGL Ad vanced 328 ft AGL Unlimited An TAC sequence list figures per formed sequentially during trip through Aerobatic Zone has sum K-factors appro priate category being flown order someone ground able judge well flier performs Free Pro gram flier must write paper performed IAC provides forms B C purpose Some judge must check competitors Free Program Forms B C before event involves lot work FAI-CAT adding machinefor both judge competitor Thats reason judges have familiar FAI-CAT TAC categories must fly Known Compul sory sequences made up cat egory published yearly IAC diffi culty flying Known Compulsory sequence increases Basic Unlimited first flight event competitor Known Compulsory also qualifying flight majority judges votes competi tor has demonstrated ability safely control aircraft disqualified category AMA could likewise Let digress Model Aviations Compe tition Newsletter section June 1989 issue pages 139-140 moment will find description IMAC International Miniature Aerobatics Club its compulsory sequences 1989 Aresti diagrams given names figures K factors can see what am discussing has used RC model world since 1974 Its new havent heard about before Now back airplanes can sit IAC has no compulsory advancements category competitors category pilot flies some what dependent airplane because air planes too weak structurally lack suffi cient power perform Advanced Unlimited category figures Intermediate Advanced Unlimited catego ries must also fly Unknown Compulsory Pro gram Unknown Compulsory constructed IAC headquarters supplied contest organizers particular contest Now come peculiarity Only pilots Unlimited category allowed perform Graded Unlimited Four-Minute Free Program program judged Originality K ersatility K armony & Rhythm K xecution K so done OUR REV-UP INVENTORY VERA GES OVER 9000 PROPS ii IMMEDIATE SHIPMENT ON VISAIMC CARBON FIBER LAMINATES Aerospace Composite Products offers variety rigid carbon fiber/epoxy sheets add stiffness almost material- fiberglass foam bal sawood laminates can used reinforce foam wings leading trailing edges wing spars Carbon Fiber bonds easily slow setting cyanoacrylates 5-minute epoxies laminate can stripped narrower widths CL-i 007 thick 1x48-$500 1x72-$700 CL-2 014 thick 1x48-$800 1x72-$1100 Send SASE information additional sizes products Add S300 shipping handling Calif residents add 6% tax Overseas orders add 15%-Order COD send check money order w r41 1nh1z VIIIIIII 1It5iIIIII51I source lightweight materials
Edition: Model Aviation - 1989/09
Page Numbers: 24, 25, 26, 27, 28, 29, 30, 31, 138, 139, 142
NO OCR TEXT NO OCR TEXT replicating particular design Original ity its strong suit Derived primarily Pik- 15 dash two other successful forerunners like Cap Laser Chipmunk RV-3 Akro its emi nently practical sport aircraft melds proven aerodynamic parameters very easy construction techniques Though its pace slower Pattern aircraft Prime Cut capable almost L access hatch cover wing bottom surface aileron control rod aileron controlled its own servo aerobatic maneuver Its steady re liable airplane takeoffs easy model can slowed down sufficiently achieve reasonably relaxed landings ever Prime Cut hardly trainer airplane big wing loading high pilot has really pay atten tion Id suggest model first step quarter-scale arena Its nice engine shots show complete access fiberglass cowl removed left close-up upside-down-mounted Quadra 40 engine 18-in prop 3-in CB plastic spinner ignition on-off switch mounted firewall handle protruding slightly through cowl photo right shows simple foam-and-tube structure fuselage exhaust system consist ing B&B muffler coupled lawn mower muffler reduce noise adapter consists two copper plumbing elbows brass tubing 26 Model Aviation view shows sleek lines big tail-dragger its tapered wing planform fully symmetrical airfoil covering Coverite Black Baron film Coverite graphics L Close-up canopy showing Wil liams Brothers -scale pilot complete dark glasses roll bar adding nice touch realism model canopy commercially available T&D Fiber glass Specialties Tinting black Tintex * view top center section wing shows 1/4-In plywood wing mounting key tongue used lieu common dowel arrangement author finds system easier install easier adjust good fit aileron servo lead seen extend ing wing Name address label wing suits AMA identification requirement ick Sarpolus N COWL PVY* DOW I. STRUCTURE3/3z BALSA &HEET OiE TECTFOAM CORE A &HEEI.j .- .___ -I 51- -- PLYL8HEET N - BALSA WING $1DDLE SQ BALSA BALSA BJOCJ / ALUMgPL 3/5 PL DOUBLiR SIG BRA&FOAM CORE LANDING CD GFAR CD 3/5BfL8ALE N 0 Co TI P& size airplanes apparent photo author left his friend Lou McGuire right showing off respective models Lous plane also powered Quadra 40 distinguished its Chipmunk-like trim scheme different canopy Lous airplane finished several months before authors benefited Lous flying experience Modifications incorporated landing gear based what Lou learned bottom shot wing off shows interior arrangement Four servos mounted side by-side across fuselage Two servos elevator control surface giving redundancy control power other two throttle rudder control Note use two lawn mower mufflers coupled B&B muffler attempt quiet large engine lack effective mufflers market large engines real problem change 40 60 size shipa bit challenge makes fun Construction sufficiently straightfor ward capable modelers will have no problems building supplies readily available fiberglass cowling wheel pants well plastic canopy available T&D Fiberglass alumi num landing gear Bravo unit Sig Manufacturing Co other hardware commercially available dont have local foam cutter foam cores can pur chased Robins Wing Balsa ply wood available locally through mail order suppliers surmise overall cost comparable less com mercial kit aircraft size friend Lou McGuire began work Prime Cut same time did Lou finished flying several months before Lous experience aircraft led us beef up landing gear mounting additional strength As shown plans has worked out well came time test fly Prime Cut knew little worry about Nevertheless took usual bundle photographs model before first flight though cant remember ever losing plane its debut always take RE/IFORCE FIRI FIBERGLASS COWL/ WITH FIBERBLM AIID EPOKY IIII III I III 11111 Ill' 'Ii IIII k4 TRIANGLEip TRIANGLE STOCKSTOCK FIBERBLASS COWL P1K-IS WHEEL PANTS NO IN AND PLASTIC CANOPY AVAILABLE FROM r o FIBERGLASS 30355 BLOCK GARDEN CITY NI 4B135 S I/B SPINNERS/SI BALSA TOP SECTID cI 91FUEL TANK Ic~I r~I ~II 41 IIi 4 - ~II I/BPLYBALSA QUADRA 55 OR 40ATTACi RECOMMENDEDWING 1/4 PLYWOOD LANDING BEAR MOUNTS FIBERGLASS WHEEL PANTS 4 I/I WHEELS photo record precautionary measure first flight uneventfuluntil midair After takeoff making few ele vator trim adjustments Lou executed some rolls loops snap rolls began making low passes photogra pher concentration must have tal because didnt notice other plane until too late heard crash watched helplessly pieces airplane flut tered through sky Interestingly other midair occurred less 30 minutes later plane surviving Prime Cut withstood impact well could expected Though radio engine survived wing tail surfaces could reused fuselage destroyed Im process construct ing new fuselage hope airborne again before long Still its just well took preflight photos Construction Prime Cuts structure follows conventional foam core design youre ready scratch-built project size youve probably already developed own preferred building techniques 28 Model Aviation Full-Size Plans Available. See Page 180 I/4 BALSA I4BALSA 3/G BALSA TOP FUSELAGE SHEETING NOT SHOWN IG PLYWOOD FUSELAGE STIFFENERIN THIS VIEW FOR CLARITYJ55 BALSA/ FIN/RLDGR TWO ELEVATON SERVOS WITH/K SEPARATE LINKAGE TO EACH ELEVATOR RECOMMENDED SQUAREI4BALSA RECEIVER SERVOS I /iI __-__ ii- _ I* IG BALSA IIG PLY DOUBLERIG BALSADOUBLERI/B PLYCB ASSOCIATES FUSELAGE SIDESTAIL WHEEL FUSELAGE SECTIONL4- SOTO HEREAND BOTTOMIM BALSAASSEMBLY ATTACHED TO WINGNYLON BOLTSTRIABBLE STOCK IB BALSA WING SADDLE PIECESMODEL AVIATION MAGAZINE PRIME CUT 10/N THE ACADEN OF MODEL AERONAUTICS FLY SAFELY AID QUIETLY O I5 5 4 B 67 BB ID II IS SPORTAEROBATIC AIRCRAFT FOR LARGER ENGINES DESIGNED AND DRAWN BY DICK SARPOLUS SHEET OF B cant find local source foam core cutting recommend Aerosmith Model Aviation RD #1 Box 290 Athens NY 12015 foam cores sheeted Y32 dium-weight balsa edge glued necessary needed width Ive used t2v Browns Southern Sorghum contact finished model wings shown supported simple foam block/cardboard tube assembly under landing gear keep weight off wheels airplane left standing prevents flat spots wheels canopy cowling wheel pants commercially available T&D Fiberglass Specialties landing gear can made up %2-in aluminum stock purchase Morrisey Bravo unit Sig Manufacturing Co cement years complete suc cess builders prefer using epoxy glue thinly applied 3M No 77 spray contact cement adhere skins September 1989 29 JJTK/F ii 11 1f4 PLYWOOD WING BOLT PLATE 00 Closeup bottom tuui nuwung CB Associates heavyduty leaf spring tail wheel assembly steering linkage tached rudder pushrod elevator pushrods Theres separate pushrod elevator devises pushrod ends heavyduty 440 size jam nuts keepers elevator devises /4 PLY WING NOUAT KEY WRAP CENTER SECT/ON Ii U9PLYWOOO A/ES I/4 PLYWOOD WINE MOUNT KEY \3/4 DOWEL TRIM FLUSN NTR NINE SWFACE DEPORE P/AERGLASS/NG I/A PLY 5 V5 PLY P/RE WALL 1/4 PLYWOOD 0 / S S S, cores Wing plywood wing mounting tongue substituted commonly used dowels wing positioning reinforced installing plywood rib root wing cores prefer mounting tongue dowels since contact area fuselage bulkhead retaining wing mount can trimmed shimmed necessary get correct wing-to-fuselage fit wing core sheeted top bottom trim off leading edge block Left shot catches aircraft climbs out its first takeoff Right its aerobatic capability undisputable dramatic photo Un fortunately lust moments later suffered midair collision extensively damaged fuselage completely replaced Prime Cut can mounted twin floats off-water flying fun foam core floats 48 x 6 have additional sheet aiuminum support strut bolted fuselage hind wing water rudder aft end float coupled aircraft rudder preparing lakeolT i ne auinor seems listening last-minute instructions Lou McGulre another member Jersey Coast Sportfliers Club just prior takeoff run tail wheel off ground Prime Cut just point smoothly lifting off Full-Size Plans Available. Page 180 SECT/ON Ar ROLASS CLOTH AND EPOXYLAYER OVER CENTER JO/NT J/N BALSA LEAD/NB EDGE SHEET WINO WITH -3/iS BALSA /NSTALL AILERON SERVOS IN WINO _____ WITH ACCESS RATCH ON BOTTOM SURFACE HOLE THROUGH FOAM CORE FOR SERVO EXTENSION CABLE ET COMPLETE WING W CUT AILERONS FREE FIN/SN EDGES I/B BALSA I\ Il 5/SB BALSA SHEETING CENTER LIRE I/U BALSA BULKHEADS ~ii 1/4 BALSA AILERON CROSS SECT/ON FOAM STABILIZER TEMPLATES USE HEAVY DI/TY N/RUES FOAM FIN/RWDER TEMPLATES 5/55 TEMPERED ALUM/MUM LARDING GEAR OR USE BIG MFG COS BRAVO LARDING GEAR hz FOAM WING CONE TEMPLATES BLOCK 11 I BALSA TIPS FOAM CORE FUSELAGE TOP BLOCK TEMPLATES 1/4 BALSA EDGES II J U I II PR/ME CUT SHEET S OF * sand square Add oversized leading edge strip plane sand shape wing tips sanded angle sheeted balsa easier sand ing tip blocks shape also produces lighter results Cut ailerons sheeted wing trim down allow balsa edges sand shape Hinge ailerons along centerline using large sturdy freely moving hingesand plenty Cut recesses lower wing surface aileron servo mounting installation aileron servo exten sion cables heat end piece A-in steel rod push through foam core root aileron servo location Removable hatches can stalled over servo areas Butt glue two wing halves wrap center joint wing heavy fiberglass cloth epoxy Use double layers cloth center Fuselage Select firm-to-hard balsa fuselage sides edge gluing splicing necessary achieve size required Glue /16 plywood doublers A-in plywood landing gear block reinforcements balsa wing saddle pieces stab saddle doublers balsa corner strips two fuselage sides before adding bulkheads Glue %-in plywood firewall next three bulkheads sides ing certain install perpendicular angle Glue second side three bulkheads sides parallel firewall wing trailing edge position Note A-in triangle stock used sides front plywood firewall -in triangle stock behind firewall Add A-in plywood wing bolt plate cockpit floor/fuselage reinforce ment piece Pull tail end together stall four rear bulkheads As certain fuselage sides taper straight line bulkhead beside wing trailing edge tail ensuring straight-cut foam top block will fit cor rectly Sheet foam fuselage top pieces /32 balsa Trim sheeting necessary glue place atop basic fuselage structure Reinforce firewall installation heavy fiberglass cloth epoxy ap plied over triangle stock behind fire wall also install several A-in-long No 4 screws through sides firewall extra security against vibration large gas engine can produce Large 8-32 blind nuts tee nuts installed firewall engine mounting bolts Add plywood landing gear mount forward bottom section fuselage Before adding fuselage bottom sheeting cut holes rear bulkheads eleva tor rudder pushrods usually wait until tail surfaces installed wing fitted fuselage before adding fuse lage bottom planlting Engine mount tail surfaces elevator stabilizer fin rudders fiberContinued page 138 September 1989 31 PRECISION MODEL PRODUCTS /ZIIflJ Made USA j7BARSTOCK ALUMINUM SPINNERS RetailAppros PriceWeight $1395058 oz 1495095oz 159510002 1695160oz 1895150oz 1895190oz 2095170or 2295220oz 2495200oz 2695260oz 2895250oz 3695340oz 4995470or 5995520oz 6995570or 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available tn Stzes Add $3 00 Per Sptnner PROP NUT ADAPTORS V Size . 1/4-28 28/7mm .6x1Omm 7x1Omm 5/1624.. 8x1Omm 8x12Smm 3/824 Approx Weight 061 061 or 063 or 082 076 076 02 076 075 sz 117 oz 115 02 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 / *ALL PARTS PRE-CUT & PREPAINTED O4/ BUILD & FLY IN TWO HOURS PAPER AIRPLANES 433 NIHOA STREET KAHULUI HI 96732 USA CATALOG $750 Contains 1000s paper airplanes postage stamp size 6 foot wing span Gliders rubber powered Diecut youcut Largest known source paper airplanes world Cost catalog deducted 1st order over $2500 ASTOUNDINGt CataLog AIR aL4plane aboue $1050 ptua $250 pohaga Letters Editor Continued page 12 sick 60 40 did fine job Keep up Homer Show young kids Beno Echerd South Padre Island TX Safety/Preston Continued page 22 associated gasoline-filled fuel cans let ter did catch eye dated September 1986 came Ernest Razzano li censed A&E mechanic 50 years experi ence Ernies letter responded article previ ous Safety column concerning hazard hav ing fuel cans batteries close proximity sent photos flight box using did use automotive fuel pump dis pense gasoline However Ernie has battery powering fuel pump located separate flight box also houses electric starter phone jack battery box used make electrical connection would welcome letters opinions pro con use electric pumps dispens ing gasoline models particular besides Ernie Razzano using automotive fuel pumps purpose would care tell us about setup Before leaving subject fuel fires/explo sions Jim Baxter Spokane WA sent news paper clipping headline Arson Sus pected Hobby Shop Fire Jim highlighted segment clipping stated 30 50 gallons methanol-based model airplane fuel stored building did ex plode letter Jim commented Since store totally gutted suspect fuel en hanced intensity fire Im sure did reason mentioning newspaper ac count question whether fuel stored metal cans safer plastic jugs guess fuel hobby shop plastic jugs melted allowed fuel burn cans metal its guess may well have exploded Any comments safety metal versus plastic fuel storage containers will welcome responding advertisers mention read about ModelAvlatlon Prime Cut/Sarpolus Continued page 31 glass cowl must trimmed necessary clear engine cylinder Mount cowl using four nylon bolts fit holes tapped fuse lage sides Tap holes A-in plywood aluminum landing gear held place A-in nylon bolts tail surface foam cores also sheeted %2 balsa Cut sheeting apart along hinge lines trim back allow added balsa edging Join horizontal stabilizer halves reinforcing fiberglass cloth epoxy Glue stabilizer fuselage elevators controlled its own servo pushrod Glue vertical fin place rudder linkage via pushrod cables tail wheel steering linked rudder small springs Balsa blocks must shaped installed behind fu selage top pieces side fin recess surfaces accept A-in plywood pieces nylon horns mounted control surfaces ailerons elevators rudder horns retained self-tapping sheet metal screws Epoxy plywood mounts control surfaces recommend using larger 4-40 threaded rods devises linkages Fiberglass tube pushrods used elevator linkages use iAin plywood servo mounts fuse lage Using separate servos elevators its own pushrod allows pushrods perfectly straight Since pushrods cross over within fuselage elevator servos mounted % higher other keep two pushrods rubbing together made up aileron extension cables Y harness two aileron servos mounted wing 1200 mAh battery pack used wrapped foam rubber positioned re cess cut foam fuselage top block bat tery pack can located behind wing posi tion necessary balance Landing gear tail wheel assembly can opy sheet aluminum landing gear can cut %2 aluminum stock available use Morrissey Bravo landing gear Sig Manufac turing Co secured T&D Fiberglass wheel pants inserting two screws through alumi num gear plywood block epoxied inside wheel pants Alternatively Sig B&B Special ties stock mounts wheel collar type leaf-spring tail wheel assembly heavy-duty model CB Associates 16oz fuel tank used space available 138 Model Aviation Paper Flying Scale Model Airplane $700 Part No IT-iSO-B fl175-B fl200B T1-225-B T1-226-B 11-250-B 11-25 1-B 11-275-B 11276-B 11300-B 11301-B 11-325-B 11-350-B 11375-8 TT-400-B Sire .. 1112 .. 13/4 .. 21/4 .. 21/4 FAt .. 21/2 2-1/2FAI . 2314 2314 FAt FAI .. 31/4 3112 . 3-314 . 4 Part No 11140-A TI 147A TT6 10-A TT-7 10-A TI- 516-A IT- 518-A TT-8 10-A 11-825-A IT- 375-A IT- 125-A Retail Price $495 495 495 495 495 495 495 495 595 595 another 16-oz tank smoke system de sired order keep ignition cutoff switch front firewall mounted sheet metal right angle bracket switch han dle protrudes slightly through slot cut fi bergiass cowl receiver antenna pushed nylon tube glued inside fuselage run ning back toward tail Finding large enough plastic bubble canopy aircraft like isnt easy T&D Fiber glass Specialties about source know large canopies might also try kit man ufacturers include large aircraft lines since will usually sell canopies sep arately shape canopy greatly influenc es general appearance type design its important find like Several canopies sold T&D Fiber glass suitable Note version shown plans differs used proto type photos canopy plans basically military style ver sion photos appropriate lightplane home-built aircraft Contact T&D de tails preference tint canopy shows up well use black Tintex dye warm water prevent distorting canopy shape few hours dye bath necessary achieve desired tint Use container large enough fully immerse canopy uniform result black plastic molding used lower edge provides finished appearance canopy attached four screws ply wood tabs glued fuselage top roll bar structure -in doweling quarter-scale-size pilot figure cockpit cut out add realism Propeller muffler cut hole through cowl permit choking carburetor other hole access carb needle valves B&B muffler fitted Quadra Lets face though B&B nearly other nominal muffler available Quadra does little actual muffling solution coupling $295 lawn mower muffler exhaust outlets using homemade adapter quieted things down considerably mower muffler neither too big nor excessively heavy its practical use two dual exhausts added mufflers mounted externally fuselage bottom positioned below landing gear course dont want hang con traptions nice clean aircraftbut theyll job until somebody makes true muffler larger engines reasonably muffled engines much noise comes propel ler As efforts other club members have shown noise level definitely affected shape prop tips Rounded pointed tips produce less noise Ive heard lot gas engine fliers engines produce lower-pitch noise eliminating need addi tional muffling achieving realistic sound general public noise noise Lets keep em quiet used 3/2-in P-SI plastic spinner CB Though looks quite attractive find myself picturing Tru-Turn machined aluminum spinner would look instead now com pany offering larger sizes polished aluminum unit would costly would certainly add pro pizzazz thats hard re sist Covering finishing Plastic film covering accepted norm todays modelers film easier faster apply contrib utes vast weight saving Its quite since put painted finish sport aircraft really dont miss fun doing good paint job used Coverites Black Baron film Prime Cut material new quarter-scale plane built-up structure Per magloss Super Coverite would contribute added strength totally sheeted foamcored model like Prime Cut knew plastic film would work fine Black Baron film requires lower heat set ting application Id previously used 20-year-old-plus heat sealing iron couldnt turned down low enough bought Coverite Black Baron iron pocket thermometers exact monitoring temperature Blackstone coating iron makes nice slippery Its lot easier use old iron lacked coating Using Coverite thermometer found setting around 225 0F worked best allover application film chose basic red-andwhite covering scheme overlapped film about /2 seams Black Baron easy apply showing little tendency bubble soft cloth used rub down bubbles assure total adhesion trimmed white areas blue stripe cut metal straightedge razor blade Black Baron film Positioning care fully ironed stripe place no trouble ironing stretching Black Baron ma terial particularly easy apply around com pound curves such tips tail surfaces Planning use red blue stars trim em phasis picked up some Coverite Graphics Trim Sheets purpose trim sheet material press-on adhesive backed simply pressed place after being cut desired shape Continued page 142 September 1989 139 SPECIALISTS IN CUSTOM COX TEE DEE & REED ENGINES O2OS 0495 051S074S& 09S ALL CUS TOM & STOCK PARTS VAILABLE INDIVIDUALLY COMPETITION ACCESSORIES & CUSTOMIZED K&B ENGINES RACING WHEELS KLOTZ OIL CARBON FIBER SOLID LINES ALL KINDS OF FUEL TUBING FOUR BRANDS OFGLOWPLUGS HA RD-TO-FIND HARD WARE OLD TIMER SUPPLIES COILS CONDENSERS NGK & STIlT SPARK PLUGS SILK 12 COLORS QUALITY DOPE BRUSHES 5& 7LOOP 1/4RUBBER BANDS TRANSISTOR IGNITION SYSTEMS RESISTOR HIGH TENSION LEADS 1/2A TEXACO PLA YBOY SR KIT 1/2A TEXACO ENGINES & PARTS KSB & IGNITION TIMERS RUBBER POWER KITS PROPS TISSUE AND OTHER SUPPLIES CYANOACRYLA TES & EPOXIES ORDER BY MAIL OR PHONE 019 729-4395 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING & HANDLING FEE $200 FOR INSURANCE ADD $100 STOCK ORDERS SHIPPED WITHIN 24 HRS Idle-Bar Glow Plugs Long Shortoniy $1 89 Also. Traditional line non-idle bar Glow Plugs Six Types 3 Heat Ranges High Performance Glow Element Blow Proof Seal Only $149 Swanson Associates PO Box 151 Wayne NJ nce 784a 07470 r PO Box 16621 Dept M Irvine CA 92714 714 250-1107 h. Prime Cut/Sarpolus Continued page 139 However found easier way Coverite offers die-cut sheet stars package containing 62 stars four sizes purchased pack red blue stars lifted off put air plane really easy trimming job Im sold Black Baron film Coverite also offers Black Baron epoxy paint colors match film its available spray cans would good choice fi berglass cowl wheel pants Flying Prime Cut solid stable flier thats nice responsive want wring out youre used flying larger air craft youll need literally adjust sights model appears same size sky smaller would youre flying too far out made lot faraway landings bigger models until learned gauge distance accurately bring closer Large aircraft quite stable landing ap proaches dont bounce around Bleed off speed bring model set plane down gently Aerobatics fun Prime Cut maneuvers require certain amount thought piloting skill cant horse around airplane would Ugly Stik smoke system definitely adds special air show appearance Treat big ones plenty respect thoughan 18-in prop big piece lumber can real damage Always have helper hanging behind aircraft start engine run up Safe flying watchword Radio Technique/Myers Continued page 33 Advanced Unlimited contestant except Basic category con structs figures FAT-CAT elements Free Program Thus figure commonly called Immelmann consists half-loop up ward entered upright level flight 721 K lf-roll exit upright level flight 9l32K4foratotalK l0Thedecimal numbers parentheses FAI-CAT numbers locate particular elements catalog corresponding K-factors Figures judged IAC competition elements no limit number elements can combined create figure long can keep within TACs Acrobatic Zone measures 3300 ft square 3500 ft above ground level AGL top zone 3280 ft AGL Unlimited cate gory bottom zone 1500 ft AGL Basic Sportsman 1200 ft AGL Intermediate 800 ft AGL Ad vanced 328 ft AGL Unlimited An TAC sequence list figures per formed sequentially during trip through Aerobatic Zone has sum K-factors appro priate category being flown order someone ground able judge well flier performs Free Pro gram flier must write paper performed IAC provides forms B C purpose Some judge must check competitors Free Program Forms B C before event involves lot work FAI-CAT adding machinefor both judge competitor Thats reason judges have familiar FAI-CAT TAC categories must fly Known Compul sory sequences made up cat egory published yearly IAC diffi culty flying Known Compulsory sequence increases Basic Unlimited first flight event competitor Known Compulsory also qualifying flight majority judges votes competi tor has demonstrated ability safely control aircraft disqualified category AMA could likewise Let digress Model Aviations Compe tition Newsletter section June 1989 issue pages 139-140 moment will find description IMAC International Miniature Aerobatics Club its compulsory sequences 1989 Aresti diagrams given names figures K factors can see what am discussing has used RC model world since 1974 Its new havent heard about before Now back airplanes can sit IAC has no compulsory advancements category competitors category pilot flies some what dependent airplane because air planes too weak structurally lack suffi cient power perform Advanced Unlimited category figures Intermediate Advanced Unlimited catego ries must also fly Unknown Compulsory Pro gram Unknown Compulsory constructed IAC headquarters supplied contest organizers particular contest Now come peculiarity Only pilots Unlimited category allowed perform Graded Unlimited Four-Minute Free Program program judged Originality K ersatility K armony & Rhythm K xecution K so done OUR REV-UP INVENTORY VERA GES OVER 9000 PROPS ii IMMEDIATE SHIPMENT ON VISAIMC CARBON FIBER LAMINATES Aerospace Composite Products offers variety rigid carbon fiber/epoxy sheets add stiffness almost material- fiberglass foam bal sawood laminates can used reinforce foam wings leading trailing edges wing spars Carbon Fiber bonds easily slow setting cyanoacrylates 5-minute epoxies laminate can stripped narrower widths CL-i 007 thick 1x48-$500 1x72-$700 CL-2 014 thick 1x48-$800 1x72-$1100 Send SASE information additional sizes products Add S300 shipping handling Calif residents add 6% tax Overseas orders add 15%-Order COD send check money order w r41 1nh1z VIIIIIII 1It5iIIIII51I source lightweight materials
Edition: Model Aviation - 1989/09
Page Numbers: 24, 25, 26, 27, 28, 29, 30, 31, 138, 139, 142
NO OCR TEXT NO OCR TEXT replicating particular design Original ity its strong suit Derived primarily Pik- 15 dash two other successful forerunners like Cap Laser Chipmunk RV-3 Akro its emi nently practical sport aircraft melds proven aerodynamic parameters very easy construction techniques Though its pace slower Pattern aircraft Prime Cut capable almost L access hatch cover wing bottom surface aileron control rod aileron controlled its own servo aerobatic maneuver Its steady re liable airplane takeoffs easy model can slowed down sufficiently achieve reasonably relaxed landings ever Prime Cut hardly trainer airplane big wing loading high pilot has really pay atten tion Id suggest model first step quarter-scale arena Its nice engine shots show complete access fiberglass cowl removed left close-up upside-down-mounted Quadra 40 engine 18-in prop 3-in CB plastic spinner ignition on-off switch mounted firewall handle protruding slightly through cowl photo right shows simple foam-and-tube structure fuselage exhaust system consist ing B&B muffler coupled lawn mower muffler reduce noise adapter consists two copper plumbing elbows brass tubing 26 Model Aviation view shows sleek lines big tail-dragger its tapered wing planform fully symmetrical airfoil covering Coverite Black Baron film Coverite graphics L Close-up canopy showing Wil liams Brothers -scale pilot complete dark glasses roll bar adding nice touch realism model canopy commercially available T&D Fiber glass Specialties Tinting black Tintex * view top center section wing shows 1/4-In plywood wing mounting key tongue used lieu common dowel arrangement author finds system easier install easier adjust good fit aileron servo lead seen extend ing wing Name address label wing suits AMA identification requirement ick Sarpolus N COWL PVY* DOW I. STRUCTURE3/3z BALSA &HEET OiE TECTFOAM CORE A &HEEI.j .- .___ -I 51- -- PLYL8HEET N - BALSA WING $1DDLE SQ BALSA BALSA BJOCJ / ALUMgPL 3/5 PL DOUBLiR SIG BRA&FOAM CORE LANDING CD GFAR CD 3/5BfL8ALE N 0 Co TI P& size airplanes apparent photo author left his friend Lou McGuire right showing off respective models Lous plane also powered Quadra 40 distinguished its Chipmunk-like trim scheme different canopy Lous airplane finished several months before authors benefited Lous flying experience Modifications incorporated landing gear based what Lou learned bottom shot wing off shows interior arrangement Four servos mounted side by-side across fuselage Two servos elevator control surface giving redundancy control power other two throttle rudder control Note use two lawn mower mufflers coupled B&B muffler attempt quiet large engine lack effective mufflers market large engines real problem change 40 60 size shipa bit challenge makes fun Construction sufficiently straightfor ward capable modelers will have no problems building supplies readily available fiberglass cowling wheel pants well plastic canopy available T&D Fiberglass alumi num landing gear Bravo unit Sig Manufacturing Co other hardware commercially available dont have local foam cutter foam cores can pur chased Robins Wing Balsa ply wood available locally through mail order suppliers surmise overall cost comparable less com mercial kit aircraft size friend Lou McGuire began work Prime Cut same time did Lou finished flying several months before Lous experience aircraft led us beef up landing gear mounting additional strength As shown plans has worked out well came time test fly Prime Cut knew little worry about Nevertheless took usual bundle photographs model before first flight though cant remember ever losing plane its debut always take RE/IFORCE FIRI FIBERGLASS COWL/ WITH FIBERBLM AIID EPOKY IIII III I III 11111 Ill' 'Ii IIII k4 TRIANGLEip TRIANGLE STOCKSTOCK FIBERBLASS COWL P1K-IS WHEEL PANTS NO IN AND PLASTIC CANOPY AVAILABLE FROM r o FIBERGLASS 30355 BLOCK GARDEN CITY NI 4B135 S I/B SPINNERS/SI BALSA TOP SECTID cI 91FUEL TANK Ic~I r~I ~II 41 IIi 4 - ~II I/BPLYBALSA QUADRA 55 OR 40ATTACi RECOMMENDEDWING 1/4 PLYWOOD LANDING BEAR MOUNTS FIBERGLASS WHEEL PANTS 4 I/I WHEELS photo record precautionary measure first flight uneventfuluntil midair After takeoff making few ele vator trim adjustments Lou executed some rolls loops snap rolls began making low passes photogra pher concentration must have tal because didnt notice other plane until too late heard crash watched helplessly pieces airplane flut tered through sky Interestingly other midair occurred less 30 minutes later plane surviving Prime Cut withstood impact well could expected Though radio engine survived wing tail surfaces could reused fuselage destroyed Im process construct ing new fuselage hope airborne again before long Still its just well took preflight photos Construction Prime Cuts structure follows conventional foam core design youre ready scratch-built project size youve probably already developed own preferred building techniques 28 Model Aviation Full-Size Plans Available. See Page 180 I/4 BALSA I4BALSA 3/G BALSA TOP FUSELAGE SHEETING NOT SHOWN IG PLYWOOD FUSELAGE STIFFENERIN THIS VIEW FOR CLARITYJ55 BALSA/ FIN/RLDGR TWO ELEVATON SERVOS WITH/K SEPARATE LINKAGE TO EACH ELEVATOR RECOMMENDED SQUAREI4BALSA RECEIVER SERVOS I /iI __-__ ii- _ I* IG BALSA IIG PLY DOUBLERIG BALSADOUBLERI/B PLYCB ASSOCIATES FUSELAGE SIDESTAIL WHEEL FUSELAGE SECTIONL4- SOTO HEREAND BOTTOMIM BALSAASSEMBLY ATTACHED TO WINGNYLON BOLTSTRIABBLE STOCK IB BALSA WING SADDLE PIECESMODEL AVIATION MAGAZINE PRIME CUT 10/N THE ACADEN OF MODEL AERONAUTICS FLY SAFELY AID QUIETLY O I5 5 4 B 67 BB ID II IS SPORTAEROBATIC AIRCRAFT FOR LARGER ENGINES DESIGNED AND DRAWN BY DICK SARPOLUS SHEET OF B cant find local source foam core cutting recommend Aerosmith Model Aviation RD #1 Box 290 Athens NY 12015 foam cores sheeted Y32 dium-weight balsa edge glued necessary needed width Ive used t2v Browns Southern Sorghum contact finished model wings shown supported simple foam block/cardboard tube assembly under landing gear keep weight off wheels airplane left standing prevents flat spots wheels canopy cowling wheel pants commercially available T&D Fiberglass Specialties landing gear can made up %2-in aluminum stock purchase Morrisey Bravo unit Sig Manufacturing Co cement years complete suc cess builders prefer using epoxy glue thinly applied 3M No 77 spray contact cement adhere skins September 1989 29 JJTK/F ii 11 1f4 PLYWOOD WING BOLT PLATE 00 Closeup bottom tuui nuwung CB Associates heavyduty leaf spring tail wheel assembly steering linkage tached rudder pushrod elevator pushrods Theres separate pushrod elevator devises pushrod ends heavyduty 440 size jam nuts keepers elevator devises /4 PLY WING NOUAT KEY WRAP CENTER SECT/ON Ii U9PLYWOOO A/ES I/4 PLYWOOD WINE MOUNT KEY \3/4 DOWEL TRIM FLUSN NTR NINE SWFACE DEPORE P/AERGLASS/NG I/A PLY 5 V5 PLY P/RE WALL 1/4 PLYWOOD 0 / S S S, cores Wing plywood wing mounting tongue substituted commonly used dowels wing positioning reinforced installing plywood rib root wing cores prefer mounting tongue dowels since contact area fuselage bulkhead retaining wing mount can trimmed shimmed necessary get correct wing-to-fuselage fit wing core sheeted top bottom trim off leading edge block Left shot catches aircraft climbs out its first takeoff Right its aerobatic capability undisputable dramatic photo Un fortunately lust moments later suffered midair collision extensively damaged fuselage completely replaced Prime Cut can mounted twin floats off-water flying fun foam core floats 48 x 6 have additional sheet aiuminum support strut bolted fuselage hind wing water rudder aft end float coupled aircraft rudder preparing lakeolT i ne auinor seems listening last-minute instructions Lou McGulre another member Jersey Coast Sportfliers Club just prior takeoff run tail wheel off ground Prime Cut just point smoothly lifting off Full-Size Plans Available. Page 180 SECT/ON Ar ROLASS CLOTH AND EPOXYLAYER OVER CENTER JO/NT J/N BALSA LEAD/NB EDGE SHEET WINO WITH -3/iS BALSA /NSTALL AILERON SERVOS IN WINO _____ WITH ACCESS RATCH ON BOTTOM SURFACE HOLE THROUGH FOAM CORE FOR SERVO EXTENSION CABLE ET COMPLETE WING W CUT AILERONS FREE FIN/SN EDGES I/B BALSA I\ Il 5/SB BALSA SHEETING CENTER LIRE I/U BALSA BULKHEADS ~ii 1/4 BALSA AILERON CROSS SECT/ON FOAM STABILIZER TEMPLATES USE HEAVY DI/TY N/RUES FOAM FIN/RWDER TEMPLATES 5/55 TEMPERED ALUM/MUM LARDING GEAR OR USE BIG MFG COS BRAVO LARDING GEAR hz FOAM WING CONE TEMPLATES BLOCK 11 I BALSA TIPS FOAM CORE FUSELAGE TOP BLOCK TEMPLATES 1/4 BALSA EDGES II J U I II PR/ME CUT SHEET S OF * sand square Add oversized leading edge strip plane sand shape wing tips sanded angle sheeted balsa easier sand ing tip blocks shape also produces lighter results Cut ailerons sheeted wing trim down allow balsa edges sand shape Hinge ailerons along centerline using large sturdy freely moving hingesand plenty Cut recesses lower wing surface aileron servo mounting installation aileron servo exten sion cables heat end piece A-in steel rod push through foam core root aileron servo location Removable hatches can stalled over servo areas Butt glue two wing halves wrap center joint wing heavy fiberglass cloth epoxy Use double layers cloth center Fuselage Select firm-to-hard balsa fuselage sides edge gluing splicing necessary achieve size required Glue /16 plywood doublers A-in plywood landing gear block reinforcements balsa wing saddle pieces stab saddle doublers balsa corner strips two fuselage sides before adding bulkheads Glue %-in plywood firewall next three bulkheads sides ing certain install perpendicular angle Glue second side three bulkheads sides parallel firewall wing trailing edge position Note A-in triangle stock used sides front plywood firewall -in triangle stock behind firewall Add A-in plywood wing bolt plate cockpit floor/fuselage reinforce ment piece Pull tail end together stall four rear bulkheads As certain fuselage sides taper straight line bulkhead beside wing trailing edge tail ensuring straight-cut foam top block will fit cor rectly Sheet foam fuselage top pieces /32 balsa Trim sheeting necessary glue place atop basic fuselage structure Reinforce firewall installation heavy fiberglass cloth epoxy ap plied over triangle stock behind fire wall also install several A-in-long No 4 screws through sides firewall extra security against vibration large gas engine can produce Large 8-32 blind nuts tee nuts installed firewall engine mounting bolts Add plywood landing gear mount forward bottom section fuselage Before adding fuselage bottom sheeting cut holes rear bulkheads eleva tor rudder pushrods usually wait until tail surfaces installed wing fitted fuselage before adding fuse lage bottom planlting Engine mount tail surfaces elevator stabilizer fin rudders fiberContinued page 138 September 1989 31 PRECISION MODEL PRODUCTS /ZIIflJ Made USA j7BARSTOCK ALUMINUM SPINNERS RetailAppros PriceWeight $1395058 oz 1495095oz 159510002 1695160oz 1895150oz 1895190oz 2095170or 2295220oz 2495200oz 2695260oz 2895250oz 3695340oz 4995470or 5995520oz 6995570or 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available tn Stzes Add $3 00 Per Sptnner PROP NUT ADAPTORS V Size . 1/4-28 28/7mm .6x1Omm 7x1Omm 5/1624.. 8x1Omm 8x12Smm 3/824 Approx Weight 061 061 or 063 or 082 076 076 02 076 075 sz 117 oz 115 02 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 / *ALL PARTS PRE-CUT & PREPAINTED O4/ BUILD & FLY IN TWO HOURS PAPER AIRPLANES 433 NIHOA STREET KAHULUI HI 96732 USA CATALOG $750 Contains 1000s paper airplanes postage stamp size 6 foot wing span Gliders rubber powered Diecut youcut Largest known source paper airplanes world Cost catalog deducted 1st order over $2500 ASTOUNDINGt CataLog AIR aL4plane aboue $1050 ptua $250 pohaga Letters Editor Continued page 12 sick 60 40 did fine job Keep up Homer Show young kids Beno Echerd South Padre Island TX Safety/Preston Continued page 22 associated gasoline-filled fuel cans let ter did catch eye dated September 1986 came Ernest Razzano li censed A&E mechanic 50 years experi ence Ernies letter responded article previ ous Safety column concerning hazard hav ing fuel cans batteries close proximity sent photos flight box using did use automotive fuel pump dis pense gasoline However Ernie has battery powering fuel pump located separate flight box also houses electric starter phone jack battery box used make electrical connection would welcome letters opinions pro con use electric pumps dispens ing gasoline models particular besides Ernie Razzano using automotive fuel pumps purpose would care tell us about setup Before leaving subject fuel fires/explo sions Jim Baxter Spokane WA sent news paper clipping headline Arson Sus pected Hobby Shop Fire Jim highlighted segment clipping stated 30 50 gallons methanol-based model airplane fuel stored building did ex plode letter Jim commented Since store totally gutted suspect fuel en hanced intensity fire Im sure did reason mentioning newspaper ac count question whether fuel stored metal cans safer plastic jugs guess fuel hobby shop plastic jugs melted allowed fuel burn cans metal its guess may well have exploded Any comments safety metal versus plastic fuel storage containers will welcome responding advertisers mention read about ModelAvlatlon Prime Cut/Sarpolus Continued page 31 glass cowl must trimmed necessary clear engine cylinder Mount cowl using four nylon bolts fit holes tapped fuse lage sides Tap holes A-in plywood aluminum landing gear held place A-in nylon bolts tail surface foam cores also sheeted %2 balsa Cut sheeting apart along hinge lines trim back allow added balsa edging Join horizontal stabilizer halves reinforcing fiberglass cloth epoxy Glue stabilizer fuselage elevators controlled its own servo pushrod Glue vertical fin place rudder linkage via pushrod cables tail wheel steering linked rudder small springs Balsa blocks must shaped installed behind fu selage top pieces side fin recess surfaces accept A-in plywood pieces nylon horns mounted control surfaces ailerons elevators rudder horns retained self-tapping sheet metal screws Epoxy plywood mounts control surfaces recommend using larger 4-40 threaded rods devises linkages Fiberglass tube pushrods used elevator linkages use iAin plywood servo mounts fuse lage Using separate servos elevators its own pushrod allows pushrods perfectly straight Since pushrods cross over within fuselage elevator servos mounted % higher other keep two pushrods rubbing together made up aileron extension cables Y harness two aileron servos mounted wing 1200 mAh battery pack used wrapped foam rubber positioned re cess cut foam fuselage top block bat tery pack can located behind wing posi tion necessary balance Landing gear tail wheel assembly can opy sheet aluminum landing gear can cut %2 aluminum stock available use Morrissey Bravo landing gear Sig Manufac turing Co secured T&D Fiberglass wheel pants inserting two screws through alumi num gear plywood block epoxied inside wheel pants Alternatively Sig B&B Special ties stock mounts wheel collar type leaf-spring tail wheel assembly heavy-duty model CB Associates 16oz fuel tank used space available 138 Model Aviation Paper Flying Scale Model Airplane $700 Part No IT-iSO-B fl175-B fl200B T1-225-B T1-226-B 11-250-B 11-25 1-B 11-275-B 11276-B 11300-B 11301-B 11-325-B 11-350-B 11375-8 TT-400-B Sire .. 1112 .. 13/4 .. 21/4 .. 21/4 FAt .. 21/2 2-1/2FAI . 2314 2314 FAt FAI .. 31/4 3112 . 3-314 . 4 Part No 11140-A TI 147A TT6 10-A TT-7 10-A TI- 516-A IT- 518-A TT-8 10-A 11-825-A IT- 375-A IT- 125-A Retail Price $495 495 495 495 495 495 495 495 595 595 another 16-oz tank smoke system de sired order keep ignition cutoff switch front firewall mounted sheet metal right angle bracket switch han dle protrudes slightly through slot cut fi bergiass cowl receiver antenna pushed nylon tube glued inside fuselage run ning back toward tail Finding large enough plastic bubble canopy aircraft like isnt easy T&D Fiber glass Specialties about source know large canopies might also try kit man ufacturers include large aircraft lines since will usually sell canopies sep arately shape canopy greatly influenc es general appearance type design its important find like Several canopies sold T&D Fiber glass suitable Note version shown plans differs used proto type photos canopy plans basically military style ver sion photos appropriate lightplane home-built aircraft Contact T&D de tails preference tint canopy shows up well use black Tintex dye warm water prevent distorting canopy shape few hours dye bath necessary achieve desired tint Use container large enough fully immerse canopy uniform result black plastic molding used lower edge provides finished appearance canopy attached four screws ply wood tabs glued fuselage top roll bar structure -in doweling quarter-scale-size pilot figure cockpit cut out add realism Propeller muffler cut hole through cowl permit choking carburetor other hole access carb needle valves B&B muffler fitted Quadra Lets face though B&B nearly other nominal muffler available Quadra does little actual muffling solution coupling $295 lawn mower muffler exhaust outlets using homemade adapter quieted things down considerably mower muffler neither too big nor excessively heavy its practical use two dual exhausts added mufflers mounted externally fuselage bottom positioned below landing gear course dont want hang con traptions nice clean aircraftbut theyll job until somebody makes true muffler larger engines reasonably muffled engines much noise comes propel ler As efforts other club members have shown noise level definitely affected shape prop tips Rounded pointed tips produce less noise Ive heard lot gas engine fliers engines produce lower-pitch noise eliminating need addi tional muffling achieving realistic sound general public noise noise Lets keep em quiet used 3/2-in P-SI plastic spinner CB Though looks quite attractive find myself picturing Tru-Turn machined aluminum spinner would look instead now com pany offering larger sizes polished aluminum unit would costly would certainly add pro pizzazz thats hard re sist Covering finishing Plastic film covering accepted norm todays modelers film easier faster apply contrib utes vast weight saving Its quite since put painted finish sport aircraft really dont miss fun doing good paint job used Coverites Black Baron film Prime Cut material new quarter-scale plane built-up structure Per magloss Super Coverite would contribute added strength totally sheeted foamcored model like Prime Cut knew plastic film would work fine Black Baron film requires lower heat set ting application Id previously used 20-year-old-plus heat sealing iron couldnt turned down low enough bought Coverite Black Baron iron pocket thermometers exact monitoring temperature Blackstone coating iron makes nice slippery Its lot easier use old iron lacked coating Using Coverite thermometer found setting around 225 0F worked best allover application film chose basic red-andwhite covering scheme overlapped film about /2 seams Black Baron easy apply showing little tendency bubble soft cloth used rub down bubbles assure total adhesion trimmed white areas blue stripe cut metal straightedge razor blade Black Baron film Positioning care fully ironed stripe place no trouble ironing stretching Black Baron ma terial particularly easy apply around com pound curves such tips tail surfaces Planning use red blue stars trim em phasis picked up some Coverite Graphics Trim Sheets purpose trim sheet material press-on adhesive backed simply pressed place after being cut desired shape Continued page 142 September 1989 139 SPECIALISTS IN CUSTOM COX TEE DEE & REED ENGINES O2OS 0495 051S074S& 09S ALL CUS TOM & STOCK PARTS VAILABLE INDIVIDUALLY COMPETITION ACCESSORIES & CUSTOMIZED K&B ENGINES RACING WHEELS KLOTZ OIL CARBON FIBER SOLID LINES ALL KINDS OF FUEL TUBING FOUR BRANDS OFGLOWPLUGS HA RD-TO-FIND HARD WARE OLD TIMER SUPPLIES COILS CONDENSERS NGK & STIlT SPARK PLUGS SILK 12 COLORS QUALITY DOPE BRUSHES 5& 7LOOP 1/4RUBBER BANDS TRANSISTOR IGNITION SYSTEMS RESISTOR HIGH TENSION LEADS 1/2A TEXACO PLA YBOY SR KIT 1/2A TEXACO ENGINES & PARTS KSB & IGNITION TIMERS RUBBER POWER KITS PROPS TISSUE AND OTHER SUPPLIES CYANOACRYLA TES & EPOXIES ORDER BY MAIL OR PHONE 019 729-4395 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING & HANDLING FEE $200 FOR INSURANCE ADD $100 STOCK ORDERS SHIPPED WITHIN 24 HRS Idle-Bar Glow Plugs Long Shortoniy $1 89 Also. Traditional line non-idle bar Glow Plugs Six Types 3 Heat Ranges High Performance Glow Element Blow Proof Seal Only $149 Swanson Associates PO Box 151 Wayne NJ nce 784a 07470 r PO Box 16621 Dept M Irvine CA 92714 714 250-1107 h. Prime Cut/Sarpolus Continued page 139 However found easier way Coverite offers die-cut sheet stars package containing 62 stars four sizes purchased pack red blue stars lifted off put air plane really easy trimming job Im sold Black Baron film Coverite also offers Black Baron epoxy paint colors match film its available spray cans would good choice fi berglass cowl wheel pants Flying Prime Cut solid stable flier thats nice responsive want wring out youre used flying larger air craft youll need literally adjust sights model appears same size sky smaller would youre flying too far out made lot faraway landings bigger models until learned gauge distance accurately bring closer Large aircraft quite stable landing ap proaches dont bounce around Bleed off speed bring model set plane down gently Aerobatics fun Prime Cut maneuvers require certain amount thought piloting skill cant horse around airplane would Ugly Stik smoke system definitely adds special air show appearance Treat big ones plenty respect thoughan 18-in prop big piece lumber can real damage Always have helper hanging behind aircraft start engine run up Safe flying watchword Radio Technique/Myers Continued page 33 Advanced Unlimited contestant except Basic category con structs figures FAT-CAT elements Free Program Thus figure commonly called Immelmann consists half-loop up ward entered upright level flight 721 K lf-roll exit upright level flight 9l32K4foratotalK l0Thedecimal numbers parentheses FAI-CAT numbers locate particular elements catalog corresponding K-factors Figures judged IAC competition elements no limit number elements can combined create figure long can keep within TACs Acrobatic Zone measures 3300 ft square 3500 ft above ground level AGL top zone 3280 ft AGL Unlimited cate gory bottom zone 1500 ft AGL Basic Sportsman 1200 ft AGL Intermediate 800 ft AGL Ad vanced 328 ft AGL Unlimited An TAC sequence list figures per formed sequentially during trip through Aerobatic Zone has sum K-factors appro priate category being flown order someone ground able judge well flier performs Free Pro gram flier must write paper performed IAC provides forms B C purpose Some judge must check competitors Free Program Forms B C before event involves lot work FAI-CAT adding machinefor both judge competitor Thats reason judges have familiar FAI-CAT TAC categories must fly Known Compul sory sequences made up cat egory published yearly IAC diffi culty flying Known Compulsory sequence increases Basic Unlimited first flight event competitor Known Compulsory also qualifying flight majority judges votes competi tor has demonstrated ability safely control aircraft disqualified category AMA could likewise Let digress Model Aviations Compe tition Newsletter section June 1989 issue pages 139-140 moment will find description IMAC International Miniature Aerobatics Club its compulsory sequences 1989 Aresti diagrams given names figures K factors can see what am discussing has used RC model world since 1974 Its new havent heard about before Now back airplanes can sit IAC has no compulsory advancements category competitors category pilot flies some what dependent airplane because air planes too weak structurally lack suffi cient power perform Advanced Unlimited category figures Intermediate Advanced Unlimited catego ries must also fly Unknown Compulsory Pro gram Unknown Compulsory constructed IAC headquarters supplied contest organizers particular contest Now come peculiarity Only pilots Unlimited category allowed perform Graded Unlimited Four-Minute Free Program program judged Originality K ersatility K armony & Rhythm K xecution K so done OUR REV-UP INVENTORY VERA GES OVER 9000 PROPS ii IMMEDIATE SHIPMENT ON VISAIMC CARBON FIBER LAMINATES Aerospace Composite Products offers variety rigid carbon fiber/epoxy sheets add stiffness almost material- fiberglass foam bal sawood laminates can used reinforce foam wings leading trailing edges wing spars Carbon Fiber bonds easily slow setting cyanoacrylates 5-minute epoxies laminate can stripped narrower widths CL-i 007 thick 1x48-$500 1x72-$700 CL-2 014 thick 1x48-$800 1x72-$1100 Send SASE information additional sizes products Add S300 shipping handling Calif residents add 6% tax Overseas orders add 15%-Order COD send check money order w r41 1nh1z VIIIIIII 1It5iIIIII51I source lightweight materials
Edition: Model Aviation - 1989/09
Page Numbers: 24, 25, 26, 27, 28, 29, 30, 31, 138, 139, 142
NO OCR TEXT NO OCR TEXT replicating particular design Original ity its strong suit Derived primarily Pik- 15 dash two other successful forerunners like Cap Laser Chipmunk RV-3 Akro its emi nently practical sport aircraft melds proven aerodynamic parameters very easy construction techniques Though its pace slower Pattern aircraft Prime Cut capable almost L access hatch cover wing bottom surface aileron control rod aileron controlled its own servo aerobatic maneuver Its steady re liable airplane takeoffs easy model can slowed down sufficiently achieve reasonably relaxed landings ever Prime Cut hardly trainer airplane big wing loading high pilot has really pay atten tion Id suggest model first step quarter-scale arena Its nice engine shots show complete access fiberglass cowl removed left close-up upside-down-mounted Quadra 40 engine 18-in prop 3-in CB plastic spinner ignition on-off switch mounted firewall handle protruding slightly through cowl photo right shows simple foam-and-tube structure fuselage exhaust system consist ing B&B muffler coupled lawn mower muffler reduce noise adapter consists two copper plumbing elbows brass tubing 26 Model Aviation view shows sleek lines big tail-dragger its tapered wing planform fully symmetrical airfoil covering Coverite Black Baron film Coverite graphics L Close-up canopy showing Wil liams Brothers -scale pilot complete dark glasses roll bar adding nice touch realism model canopy commercially available T&D Fiber glass Specialties Tinting black Tintex * view top center section wing shows 1/4-In plywood wing mounting key tongue used lieu common dowel arrangement author finds system easier install easier adjust good fit aileron servo lead seen extend ing wing Name address label wing suits AMA identification requirement ick Sarpolus N COWL PVY* DOW I. STRUCTURE3/3z BALSA &HEET OiE TECTFOAM CORE A &HEEI.j .- .___ -I 51- -- PLYL8HEET N - BALSA WING $1DDLE SQ BALSA BALSA BJOCJ / ALUMgPL 3/5 PL DOUBLiR SIG BRA&FOAM CORE LANDING CD GFAR CD 3/5BfL8ALE N 0 Co TI P& size airplanes apparent photo author left his friend Lou McGuire right showing off respective models Lous plane also powered Quadra 40 distinguished its Chipmunk-like trim scheme different canopy Lous airplane finished several months before authors benefited Lous flying experience Modifications incorporated landing gear based what Lou learned bottom shot wing off shows interior arrangement Four servos mounted side by-side across fuselage Two servos elevator control surface giving redundancy control power other two throttle rudder control Note use two lawn mower mufflers coupled B&B muffler attempt quiet large engine lack effective mufflers market large engines real problem change 40 60 size shipa bit challenge makes fun Construction sufficiently straightfor ward capable modelers will have no problems building supplies readily available fiberglass cowling wheel pants well plastic canopy available T&D Fiberglass alumi num landing gear Bravo unit Sig Manufacturing Co other hardware commercially available dont have local foam cutter foam cores can pur chased Robins Wing Balsa ply wood available locally through mail order suppliers surmise overall cost comparable less com mercial kit aircraft size friend Lou McGuire began work Prime Cut same time did Lou finished flying several months before Lous experience aircraft led us beef up landing gear mounting additional strength As shown plans has worked out well came time test fly Prime Cut knew little worry about Nevertheless took usual bundle photographs model before first flight though cant remember ever losing plane its debut always take RE/IFORCE FIRI FIBERGLASS COWL/ WITH FIBERBLM AIID EPOKY IIII III I III 11111 Ill' 'Ii IIII k4 TRIANGLEip TRIANGLE STOCKSTOCK FIBERBLASS COWL P1K-IS WHEEL PANTS NO IN AND PLASTIC CANOPY AVAILABLE FROM r o FIBERGLASS 30355 BLOCK GARDEN CITY NI 4B135 S I/B SPINNERS/SI BALSA TOP SECTID cI 91FUEL TANK Ic~I r~I ~II 41 IIi 4 - ~II I/BPLYBALSA QUADRA 55 OR 40ATTACi RECOMMENDEDWING 1/4 PLYWOOD LANDING BEAR MOUNTS FIBERGLASS WHEEL PANTS 4 I/I WHEELS photo record precautionary measure first flight uneventfuluntil midair After takeoff making few ele vator trim adjustments Lou executed some rolls loops snap rolls began making low passes photogra pher concentration must have tal because didnt notice other plane until too late heard crash watched helplessly pieces airplane flut tered through sky Interestingly other midair occurred less 30 minutes later plane surviving Prime Cut withstood impact well could expected Though radio engine survived wing tail surfaces could reused fuselage destroyed Im process construct ing new fuselage hope airborne again before long Still its just well took preflight photos Construction Prime Cuts structure follows conventional foam core design youre ready scratch-built project size youve probably already developed own preferred building techniques 28 Model Aviation Full-Size Plans Available. See Page 180 I/4 BALSA I4BALSA 3/G BALSA TOP FUSELAGE SHEETING NOT SHOWN IG PLYWOOD FUSELAGE STIFFENERIN THIS VIEW FOR CLARITYJ55 BALSA/ FIN/RLDGR TWO ELEVATON SERVOS WITH/K SEPARATE LINKAGE TO EACH ELEVATOR RECOMMENDED SQUAREI4BALSA RECEIVER SERVOS I /iI __-__ ii- _ I* IG BALSA IIG PLY DOUBLERIG BALSADOUBLERI/B PLYCB ASSOCIATES FUSELAGE SIDESTAIL WHEEL FUSELAGE SECTIONL4- SOTO HEREAND BOTTOMIM BALSAASSEMBLY ATTACHED TO WINGNYLON BOLTSTRIABBLE STOCK IB BALSA WING SADDLE PIECESMODEL AVIATION MAGAZINE PRIME CUT 10/N THE ACADEN OF MODEL AERONAUTICS FLY SAFELY AID QUIETLY O I5 5 4 B 67 BB ID II IS SPORTAEROBATIC AIRCRAFT FOR LARGER ENGINES DESIGNED AND DRAWN BY DICK SARPOLUS SHEET OF B cant find local source foam core cutting recommend Aerosmith Model Aviation RD #1 Box 290 Athens NY 12015 foam cores sheeted Y32 dium-weight balsa edge glued necessary needed width Ive used t2v Browns Southern Sorghum contact finished model wings shown supported simple foam block/cardboard tube assembly under landing gear keep weight off wheels airplane left standing prevents flat spots wheels canopy cowling wheel pants commercially available T&D Fiberglass Specialties landing gear can made up %2-in aluminum stock purchase Morrisey Bravo unit Sig Manufacturing Co cement years complete suc cess builders prefer using epoxy glue thinly applied 3M No 77 spray contact cement adhere skins September 1989 29 JJTK/F ii 11 1f4 PLYWOOD WING BOLT PLATE 00 Closeup bottom tuui nuwung CB Associates heavyduty leaf spring tail wheel assembly steering linkage tached rudder pushrod elevator pushrods Theres separate pushrod elevator devises pushrod ends heavyduty 440 size jam nuts keepers elevator devises /4 PLY WING NOUAT KEY WRAP CENTER SECT/ON Ii U9PLYWOOO A/ES I/4 PLYWOOD WINE MOUNT KEY \3/4 DOWEL TRIM FLUSN NTR NINE SWFACE DEPORE P/AERGLASS/NG I/A PLY 5 V5 PLY P/RE WALL 1/4 PLYWOOD 0 / S S S, cores Wing plywood wing mounting tongue substituted commonly used dowels wing positioning reinforced installing plywood rib root wing cores prefer mounting tongue dowels since contact area fuselage bulkhead retaining wing mount can trimmed shimmed necessary get correct wing-to-fuselage fit wing core sheeted top bottom trim off leading edge block Left shot catches aircraft climbs out its first takeoff Right its aerobatic capability undisputable dramatic photo Un fortunately lust moments later suffered midair collision extensively damaged fuselage completely replaced Prime Cut can mounted twin floats off-water flying fun foam core floats 48 x 6 have additional sheet aiuminum support strut bolted fuselage hind wing water rudder aft end float coupled aircraft rudder preparing lakeolT i ne auinor seems listening last-minute instructions Lou McGulre another member Jersey Coast Sportfliers Club just prior takeoff run tail wheel off ground Prime Cut just point smoothly lifting off Full-Size Plans Available. Page 180 SECT/ON Ar ROLASS CLOTH AND EPOXYLAYER OVER CENTER JO/NT J/N BALSA LEAD/NB EDGE SHEET WINO WITH -3/iS BALSA /NSTALL AILERON SERVOS IN WINO _____ WITH ACCESS RATCH ON BOTTOM SURFACE HOLE THROUGH FOAM CORE FOR SERVO EXTENSION CABLE ET COMPLETE WING W CUT AILERONS FREE FIN/SN EDGES I/B BALSA I\ Il 5/SB BALSA SHEETING CENTER LIRE I/U BALSA BULKHEADS ~ii 1/4 BALSA AILERON CROSS SECT/ON FOAM STABILIZER TEMPLATES USE HEAVY DI/TY N/RUES FOAM FIN/RWDER TEMPLATES 5/55 TEMPERED ALUM/MUM LARDING GEAR OR USE BIG MFG COS BRAVO LARDING GEAR hz FOAM WING CONE TEMPLATES BLOCK 11 I BALSA TIPS FOAM CORE FUSELAGE TOP BLOCK TEMPLATES 1/4 BALSA EDGES II J U I II PR/ME CUT SHEET S OF * sand square Add oversized leading edge strip plane sand shape wing tips sanded angle sheeted balsa easier sand ing tip blocks shape also produces lighter results Cut ailerons sheeted wing trim down allow balsa edges sand shape Hinge ailerons along centerline using large sturdy freely moving hingesand plenty Cut recesses lower wing surface aileron servo mounting installation aileron servo exten sion cables heat end piece A-in steel rod push through foam core root aileron servo location Removable hatches can stalled over servo areas Butt glue two wing halves wrap center joint wing heavy fiberglass cloth epoxy Use double layers cloth center Fuselage Select firm-to-hard balsa fuselage sides edge gluing splicing necessary achieve size required Glue /16 plywood doublers A-in plywood landing gear block reinforcements balsa wing saddle pieces stab saddle doublers balsa corner strips two fuselage sides before adding bulkheads Glue %-in plywood firewall next three bulkheads sides ing certain install perpendicular angle Glue second side three bulkheads sides parallel firewall wing trailing edge position Note A-in triangle stock used sides front plywood firewall -in triangle stock behind firewall Add A-in plywood wing bolt plate cockpit floor/fuselage reinforce ment piece Pull tail end together stall four rear bulkheads As certain fuselage sides taper straight line bulkhead beside wing trailing edge tail ensuring straight-cut foam top block will fit cor rectly Sheet foam fuselage top pieces /32 balsa Trim sheeting necessary glue place atop basic fuselage structure Reinforce firewall installation heavy fiberglass cloth epoxy ap plied over triangle stock behind fire wall also install several A-in-long No 4 screws through sides firewall extra security against vibration large gas engine can produce Large 8-32 blind nuts tee nuts installed firewall engine mounting bolts Add plywood landing gear mount forward bottom section fuselage Before adding fuselage bottom sheeting cut holes rear bulkheads eleva tor rudder pushrods usually wait until tail surfaces installed wing fitted fuselage before adding fuse lage bottom planlting Engine mount tail surfaces elevator stabilizer fin rudders fiberContinued page 138 September 1989 31 PRECISION MODEL PRODUCTS /ZIIflJ Made USA j7BARSTOCK ALUMINUM SPINNERS RetailAppros PriceWeight $1395058 oz 1495095oz 159510002 1695160oz 1895150oz 1895190oz 2095170or 2295220oz 2495200oz 2695260oz 2895250oz 3695340oz 4995470or 5995520oz 6995570or 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available tn Stzes Add $3 00 Per Sptnner PROP NUT ADAPTORS V Size . 1/4-28 28/7mm .6x1Omm 7x1Omm 5/1624.. 8x1Omm 8x12Smm 3/824 Approx Weight 061 061 or 063 or 082 076 076 02 076 075 sz 117 oz 115 02 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 / *ALL PARTS PRE-CUT & PREPAINTED O4/ BUILD & FLY IN TWO HOURS PAPER AIRPLANES 433 NIHOA STREET KAHULUI HI 96732 USA CATALOG $750 Contains 1000s paper airplanes postage stamp size 6 foot wing span Gliders rubber powered Diecut youcut Largest known source paper airplanes world Cost catalog deducted 1st order over $2500 ASTOUNDINGt CataLog AIR aL4plane aboue $1050 ptua $250 pohaga Letters Editor Continued page 12 sick 60 40 did fine job Keep up Homer Show young kids Beno Echerd South Padre Island TX Safety/Preston Continued page 22 associated gasoline-filled fuel cans let ter did catch eye dated September 1986 came Ernest Razzano li censed A&E mechanic 50 years experi ence Ernies letter responded article previ ous Safety column concerning hazard hav ing fuel cans batteries close proximity sent photos flight box using did use automotive fuel pump dis pense gasoline However Ernie has battery powering fuel pump located separate flight box also houses electric starter phone jack battery box used make electrical connection would welcome letters opinions pro con use electric pumps dispens ing gasoline models particular besides Ernie Razzano using automotive fuel pumps purpose would care tell us about setup Before leaving subject fuel fires/explo sions Jim Baxter Spokane WA sent news paper clipping headline Arson Sus pected Hobby Shop Fire Jim highlighted segment clipping stated 30 50 gallons methanol-based model airplane fuel stored building did ex plode letter Jim commented Since store totally gutted suspect fuel en hanced intensity fire Im sure did reason mentioning newspaper ac count question whether fuel stored metal cans safer plastic jugs guess fuel hobby shop plastic jugs melted allowed fuel burn cans metal its guess may well have exploded Any comments safety metal versus plastic fuel storage containers will welcome responding advertisers mention read about ModelAvlatlon Prime Cut/Sarpolus Continued page 31 glass cowl must trimmed necessary clear engine cylinder Mount cowl using four nylon bolts fit holes tapped fuse lage sides Tap holes A-in plywood aluminum landing gear held place A-in nylon bolts tail surface foam cores also sheeted %2 balsa Cut sheeting apart along hinge lines trim back allow added balsa edging Join horizontal stabilizer halves reinforcing fiberglass cloth epoxy Glue stabilizer fuselage elevators controlled its own servo pushrod Glue vertical fin place rudder linkage via pushrod cables tail wheel steering linked rudder small springs Balsa blocks must shaped installed behind fu selage top pieces side fin recess surfaces accept A-in plywood pieces nylon horns mounted control surfaces ailerons elevators rudder horns retained self-tapping sheet metal screws Epoxy plywood mounts control surfaces recommend using larger 4-40 threaded rods devises linkages Fiberglass tube pushrods used elevator linkages use iAin plywood servo mounts fuse lage Using separate servos elevators its own pushrod allows pushrods perfectly straight Since pushrods cross over within fuselage elevator servos mounted % higher other keep two pushrods rubbing together made up aileron extension cables Y harness two aileron servos mounted wing 1200 mAh battery pack used wrapped foam rubber positioned re cess cut foam fuselage top block bat tery pack can located behind wing posi tion necessary balance Landing gear tail wheel assembly can opy sheet aluminum landing gear can cut %2 aluminum stock available use Morrissey Bravo landing gear Sig Manufac turing Co secured T&D Fiberglass wheel pants inserting two screws through alumi num gear plywood block epoxied inside wheel pants Alternatively Sig B&B Special ties stock mounts wheel collar type leaf-spring tail wheel assembly heavy-duty model CB Associates 16oz fuel tank used space available 138 Model Aviation Paper Flying Scale Model Airplane $700 Part No IT-iSO-B fl175-B fl200B T1-225-B T1-226-B 11-250-B 11-25 1-B 11-275-B 11276-B 11300-B 11301-B 11-325-B 11-350-B 11375-8 TT-400-B Sire .. 1112 .. 13/4 .. 21/4 .. 21/4 FAt .. 21/2 2-1/2FAI . 2314 2314 FAt FAI .. 31/4 3112 . 3-314 . 4 Part No 11140-A TI 147A TT6 10-A TT-7 10-A TI- 516-A IT- 518-A TT-8 10-A 11-825-A IT- 375-A IT- 125-A Retail Price $495 495 495 495 495 495 495 495 595 595 another 16-oz tank smoke system de sired order keep ignition cutoff switch front firewall mounted sheet metal right angle bracket switch han dle protrudes slightly through slot cut fi bergiass cowl receiver antenna pushed nylon tube glued inside fuselage run ning back toward tail Finding large enough plastic bubble canopy aircraft like isnt easy T&D Fiber glass Specialties about source know large canopies might also try kit man ufacturers include large aircraft lines since will usually sell canopies sep arately shape canopy greatly influenc es general appearance type design its important find like Several canopies sold T&D Fiber glass suitable Note version shown plans differs used proto type photos canopy plans basically military style ver sion photos appropriate lightplane home-built aircraft Contact T&D de tails preference tint canopy shows up well use black Tintex dye warm water prevent distorting canopy shape few hours dye bath necessary achieve desired tint Use container large enough fully immerse canopy uniform result black plastic molding used lower edge provides finished appearance canopy attached four screws ply wood tabs glued fuselage top roll bar structure -in doweling quarter-scale-size pilot figure cockpit cut out add realism Propeller muffler cut hole through cowl permit choking carburetor other hole access carb needle valves B&B muffler fitted Quadra Lets face though B&B nearly other nominal muffler available Quadra does little actual muffling solution coupling $295 lawn mower muffler exhaust outlets using homemade adapter quieted things down considerably mower muffler neither too big nor excessively heavy its practical use two dual exhausts added mufflers mounted externally fuselage bottom positioned below landing gear course dont want hang con traptions nice clean aircraftbut theyll job until somebody makes true muffler larger engines reasonably muffled engines much noise comes propel ler As efforts other club members have shown noise level definitely affected shape prop tips Rounded pointed tips produce less noise Ive heard lot gas engine fliers engines produce lower-pitch noise eliminating need addi tional muffling achieving realistic sound general public noise noise Lets keep em quiet used 3/2-in P-SI plastic spinner CB Though looks quite attractive find myself picturing Tru-Turn machined aluminum spinner would look instead now com pany offering larger sizes polished aluminum unit would costly would certainly add pro pizzazz thats hard re sist Covering finishing Plastic film covering accepted norm todays modelers film easier faster apply contrib utes vast weight saving Its quite since put painted finish sport aircraft really dont miss fun doing good paint job used Coverites Black Baron film Prime Cut material new quarter-scale plane built-up structure Per magloss Super Coverite would contribute added strength totally sheeted foamcored model like Prime Cut knew plastic film would work fine Black Baron film requires lower heat set ting application Id previously used 20-year-old-plus heat sealing iron couldnt turned down low enough bought Coverite Black Baron iron pocket thermometers exact monitoring temperature Blackstone coating iron makes nice slippery Its lot easier use old iron lacked coating Using Coverite thermometer found setting around 225 0F worked best allover application film chose basic red-andwhite covering scheme overlapped film about /2 seams Black Baron easy apply showing little tendency bubble soft cloth used rub down bubbles assure total adhesion trimmed white areas blue stripe cut metal straightedge razor blade Black Baron film Positioning care fully ironed stripe place no trouble ironing stretching Black Baron ma terial particularly easy apply around com pound curves such tips tail surfaces Planning use red blue stars trim em phasis picked up some Coverite Graphics Trim Sheets purpose trim sheet material press-on adhesive backed simply pressed place after being cut desired shape Continued page 142 September 1989 139 SPECIALISTS IN CUSTOM COX TEE DEE & REED ENGINES O2OS 0495 051S074S& 09S ALL CUS TOM & STOCK PARTS VAILABLE INDIVIDUALLY COMPETITION ACCESSORIES & CUSTOMIZED K&B ENGINES RACING WHEELS KLOTZ OIL CARBON FIBER SOLID LINES ALL KINDS OF FUEL TUBING FOUR BRANDS OFGLOWPLUGS HA RD-TO-FIND HARD WARE OLD TIMER SUPPLIES COILS CONDENSERS NGK & STIlT SPARK PLUGS SILK 12 COLORS QUALITY DOPE BRUSHES 5& 7LOOP 1/4RUBBER BANDS TRANSISTOR IGNITION SYSTEMS RESISTOR HIGH TENSION LEADS 1/2A TEXACO PLA YBOY SR KIT 1/2A TEXACO ENGINES & PARTS KSB & IGNITION TIMERS RUBBER POWER KITS PROPS TISSUE AND OTHER SUPPLIES CYANOACRYLA TES & EPOXIES ORDER BY MAIL OR PHONE 019 729-4395 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING & HANDLING FEE $200 FOR INSURANCE ADD $100 STOCK ORDERS SHIPPED WITHIN 24 HRS Idle-Bar Glow Plugs Long Shortoniy $1 89 Also. Traditional line non-idle bar Glow Plugs Six Types 3 Heat Ranges High Performance Glow Element Blow Proof Seal Only $149 Swanson Associates PO Box 151 Wayne NJ nce 784a 07470 r PO Box 16621 Dept M Irvine CA 92714 714 250-1107 h. Prime Cut/Sarpolus Continued page 139 However found easier way Coverite offers die-cut sheet stars package containing 62 stars four sizes purchased pack red blue stars lifted off put air plane really easy trimming job Im sold Black Baron film Coverite also offers Black Baron epoxy paint colors match film its available spray cans would good choice fi berglass cowl wheel pants Flying Prime Cut solid stable flier thats nice responsive want wring out youre used flying larger air craft youll need literally adjust sights model appears same size sky smaller would youre flying too far out made lot faraway landings bigger models until learned gauge distance accurately bring closer Large aircraft quite stable landing ap proaches dont bounce around Bleed off speed bring model set plane down gently Aerobatics fun Prime Cut maneuvers require certain amount thought piloting skill cant horse around airplane would Ugly Stik smoke system definitely adds special air show appearance Treat big ones plenty respect thoughan 18-in prop big piece lumber can real damage Always have helper hanging behind aircraft start engine run up Safe flying watchword Radio Technique/Myers Continued page 33 Advanced Unlimited contestant except Basic category con structs figures FAT-CAT elements Free Program Thus figure commonly called Immelmann consists half-loop up ward entered upright level flight 721 K lf-roll exit upright level flight 9l32K4foratotalK l0Thedecimal numbers parentheses FAI-CAT numbers locate particular elements catalog corresponding K-factors Figures judged IAC competition elements no limit number elements can combined create figure long can keep within TACs Acrobatic Zone measures 3300 ft square 3500 ft above ground level AGL top zone 3280 ft AGL Unlimited cate gory bottom zone 1500 ft AGL Basic Sportsman 1200 ft AGL Intermediate 800 ft AGL Ad vanced 328 ft AGL Unlimited An TAC sequence list figures per formed sequentially during trip through Aerobatic Zone has sum K-factors appro priate category being flown order someone ground able judge well flier performs Free Pro gram flier must write paper performed IAC provides forms B C purpose Some judge must check competitors Free Program Forms B C before event involves lot work FAI-CAT adding machinefor both judge competitor Thats reason judges have familiar FAI-CAT TAC categories must fly Known Compul sory sequences made up cat egory published yearly IAC diffi culty flying Known Compulsory sequence increases Basic Unlimited first flight event competitor Known Compulsory also qualifying flight majority judges votes competi tor has demonstrated ability safely control aircraft disqualified category AMA could likewise Let digress Model Aviations Compe tition Newsletter section June 1989 issue pages 139-140 moment will find description IMAC International Miniature Aerobatics Club its compulsory sequences 1989 Aresti diagrams given names figures K factors can see what am discussing has used RC model world since 1974 Its new havent heard about before Now back airplanes can sit IAC has no compulsory advancements category competitors category pilot flies some what dependent airplane because air planes too weak structurally lack suffi cient power perform Advanced Unlimited category figures Intermediate Advanced Unlimited catego ries must also fly Unknown Compulsory Pro gram Unknown Compulsory constructed IAC headquarters supplied contest organizers particular contest Now come peculiarity Only pilots Unlimited category allowed perform Graded Unlimited Four-Minute Free Program program judged Originality K ersatility K armony & Rhythm K xecution K so done OUR REV-UP INVENTORY VERA GES OVER 9000 PROPS ii IMMEDIATE SHIPMENT ON VISAIMC CARBON FIBER LAMINATES Aerospace Composite Products offers variety rigid carbon fiber/epoxy sheets add stiffness almost material- fiberglass foam bal sawood laminates can used reinforce foam wings leading trailing edges wing spars Carbon Fiber bonds easily slow setting cyanoacrylates 5-minute epoxies laminate can stripped narrower widths CL-i 007 thick 1x48-$500 1x72-$700 CL-2 014 thick 1x48-$800 1x72-$1100 Send SASE information additional sizes products Add S300 shipping handling Calif residents add 6% tax Overseas orders add 15%-Order COD send check money order w r41 1nh1z VIIIIIII 1It5iIIIII51I source lightweight materials
Edition: Model Aviation - 1989/09
Page Numbers: 24, 25, 26, 27, 28, 29, 30, 31, 138, 139, 142
NO OCR TEXT NO OCR TEXT replicating particular design Original ity its strong suit Derived primarily Pik- 15 dash two other successful forerunners like Cap Laser Chipmunk RV-3 Akro its emi nently practical sport aircraft melds proven aerodynamic parameters very easy construction techniques Though its pace slower Pattern aircraft Prime Cut capable almost L access hatch cover wing bottom surface aileron control rod aileron controlled its own servo aerobatic maneuver Its steady re liable airplane takeoffs easy model can slowed down sufficiently achieve reasonably relaxed landings ever Prime Cut hardly trainer airplane big wing loading high pilot has really pay atten tion Id suggest model first step quarter-scale arena Its nice engine shots show complete access fiberglass cowl removed left close-up upside-down-mounted Quadra 40 engine 18-in prop 3-in CB plastic spinner ignition on-off switch mounted firewall handle protruding slightly through cowl photo right shows simple foam-and-tube structure fuselage exhaust system consist ing B&B muffler coupled lawn mower muffler reduce noise adapter consists two copper plumbing elbows brass tubing 26 Model Aviation view shows sleek lines big tail-dragger its tapered wing planform fully symmetrical airfoil covering Coverite Black Baron film Coverite graphics L Close-up canopy showing Wil liams Brothers -scale pilot complete dark glasses roll bar adding nice touch realism model canopy commercially available T&D Fiber glass Specialties Tinting black Tintex * view top center section wing shows 1/4-In plywood wing mounting key tongue used lieu common dowel arrangement author finds system easier install easier adjust good fit aileron servo lead seen extend ing wing Name address label wing suits AMA identification requirement ick Sarpolus N COWL PVY* DOW I. STRUCTURE3/3z BALSA &HEET OiE TECTFOAM CORE A &HEEI.j .- .___ -I 51- -- PLYL8HEET N - BALSA WING $1DDLE SQ BALSA BALSA BJOCJ / ALUMgPL 3/5 PL DOUBLiR SIG BRA&FOAM CORE LANDING CD GFAR CD 3/5BfL8ALE N 0 Co TI P& size airplanes apparent photo author left his friend Lou McGuire right showing off respective models Lous plane also powered Quadra 40 distinguished its Chipmunk-like trim scheme different canopy Lous airplane finished several months before authors benefited Lous flying experience Modifications incorporated landing gear based what Lou learned bottom shot wing off shows interior arrangement Four servos mounted side by-side across fuselage Two servos elevator control surface giving redundancy control power other two throttle rudder control Note use two lawn mower mufflers coupled B&B muffler attempt quiet large engine lack effective mufflers market large engines real problem change 40 60 size shipa bit challenge makes fun Construction sufficiently straightfor ward capable modelers will have no problems building supplies readily available fiberglass cowling wheel pants well plastic canopy available T&D Fiberglass alumi num landing gear Bravo unit Sig Manufacturing Co other hardware commercially available dont have local foam cutter foam cores can pur chased Robins Wing Balsa ply wood available locally through mail order suppliers surmise overall cost comparable less com mercial kit aircraft size friend Lou McGuire began work Prime Cut same time did Lou finished flying several months before Lous experience aircraft led us beef up landing gear mounting additional strength As shown plans has worked out well came time test fly Prime Cut knew little worry about Nevertheless took usual bundle photographs model before first flight though cant remember ever losing plane its debut always take RE/IFORCE FIRI FIBERGLASS COWL/ WITH FIBERBLM AIID EPOKY IIII III I III 11111 Ill' 'Ii IIII k4 TRIANGLEip TRIANGLE STOCKSTOCK FIBERBLASS COWL P1K-IS WHEEL PANTS NO IN AND PLASTIC CANOPY AVAILABLE FROM r o FIBERGLASS 30355 BLOCK GARDEN CITY NI 4B135 S I/B SPINNERS/SI BALSA TOP SECTID cI 91FUEL TANK Ic~I r~I ~II 41 IIi 4 - ~II I/BPLYBALSA QUADRA 55 OR 40ATTACi RECOMMENDEDWING 1/4 PLYWOOD LANDING BEAR MOUNTS FIBERGLASS WHEEL PANTS 4 I/I WHEELS photo record precautionary measure first flight uneventfuluntil midair After takeoff making few ele vator trim adjustments Lou executed some rolls loops snap rolls began making low passes photogra pher concentration must have tal because didnt notice other plane until too late heard crash watched helplessly pieces airplane flut tered through sky Interestingly other midair occurred less 30 minutes later plane surviving Prime Cut withstood impact well could expected Though radio engine survived wing tail surfaces could reused fuselage destroyed Im process construct ing new fuselage hope airborne again before long Still its just well took preflight photos Construction Prime Cuts structure follows conventional foam core design youre ready scratch-built project size youve probably already developed own preferred building techniques 28 Model Aviation Full-Size Plans Available. See Page 180 I/4 BALSA I4BALSA 3/G BALSA TOP FUSELAGE SHEETING NOT SHOWN IG PLYWOOD FUSELAGE STIFFENERIN THIS VIEW FOR CLARITYJ55 BALSA/ FIN/RLDGR TWO ELEVATON SERVOS WITH/K SEPARATE LINKAGE TO EACH ELEVATOR RECOMMENDED SQUAREI4BALSA RECEIVER SERVOS I /iI __-__ ii- _ I* IG BALSA IIG PLY DOUBLERIG BALSADOUBLERI/B PLYCB ASSOCIATES FUSELAGE SIDESTAIL WHEEL FUSELAGE SECTIONL4- SOTO HEREAND BOTTOMIM BALSAASSEMBLY ATTACHED TO WINGNYLON BOLTSTRIABBLE STOCK IB BALSA WING SADDLE PIECESMODEL AVIATION MAGAZINE PRIME CUT 10/N THE ACADEN OF MODEL AERONAUTICS FLY SAFELY AID QUIETLY O I5 5 4 B 67 BB ID II IS SPORTAEROBATIC AIRCRAFT FOR LARGER ENGINES DESIGNED AND DRAWN BY DICK SARPOLUS SHEET OF B cant find local source foam core cutting recommend Aerosmith Model Aviation RD #1 Box 290 Athens NY 12015 foam cores sheeted Y32 dium-weight balsa edge glued necessary needed width Ive used t2v Browns Southern Sorghum contact finished model wings shown supported simple foam block/cardboard tube assembly under landing gear keep weight off wheels airplane left standing prevents flat spots wheels canopy cowling wheel pants commercially available T&D Fiberglass Specialties landing gear can made up %2-in aluminum stock purchase Morrisey Bravo unit Sig Manufacturing Co cement years complete suc cess builders prefer using epoxy glue thinly applied 3M No 77 spray contact cement adhere skins September 1989 29 JJTK/F ii 11 1f4 PLYWOOD WING BOLT PLATE 00 Closeup bottom tuui nuwung CB Associates heavyduty leaf spring tail wheel assembly steering linkage tached rudder pushrod elevator pushrods Theres separate pushrod elevator devises pushrod ends heavyduty 440 size jam nuts keepers elevator devises /4 PLY WING NOUAT KEY WRAP CENTER SECT/ON Ii U9PLYWOOO A/ES I/4 PLYWOOD WINE MOUNT KEY \3/4 DOWEL TRIM FLUSN NTR NINE SWFACE DEPORE P/AERGLASS/NG I/A PLY 5 V5 PLY P/RE WALL 1/4 PLYWOOD 0 / S S S, cores Wing plywood wing mounting tongue substituted commonly used dowels wing positioning reinforced installing plywood rib root wing cores prefer mounting tongue dowels since contact area fuselage bulkhead retaining wing mount can trimmed shimmed necessary get correct wing-to-fuselage fit wing core sheeted top bottom trim off leading edge block Left shot catches aircraft climbs out its first takeoff Right its aerobatic capability undisputable dramatic photo Un fortunately lust moments later suffered midair collision extensively damaged fuselage completely replaced Prime Cut can mounted twin floats off-water flying fun foam core floats 48 x 6 have additional sheet aiuminum support strut bolted fuselage hind wing water rudder aft end float coupled aircraft rudder preparing lakeolT i ne auinor seems listening last-minute instructions Lou McGulre another member Jersey Coast Sportfliers Club just prior takeoff run tail wheel off ground Prime Cut just point smoothly lifting off Full-Size Plans Available. Page 180 SECT/ON Ar ROLASS CLOTH AND EPOXYLAYER OVER CENTER JO/NT J/N BALSA LEAD/NB EDGE SHEET WINO WITH -3/iS BALSA /NSTALL AILERON SERVOS IN WINO _____ WITH ACCESS RATCH ON BOTTOM SURFACE HOLE THROUGH FOAM CORE FOR SERVO EXTENSION CABLE ET COMPLETE WING W CUT AILERONS FREE FIN/SN EDGES I/B BALSA I\ Il 5/SB BALSA SHEETING CENTER LIRE I/U BALSA BULKHEADS ~ii 1/4 BALSA AILERON CROSS SECT/ON FOAM STABILIZER TEMPLATES USE HEAVY DI/TY N/RUES FOAM FIN/RWDER TEMPLATES 5/55 TEMPERED ALUM/MUM LARDING GEAR OR USE BIG MFG COS BRAVO LARDING GEAR hz FOAM WING CONE TEMPLATES BLOCK 11 I BALSA TIPS FOAM CORE FUSELAGE TOP BLOCK TEMPLATES 1/4 BALSA EDGES II J U I II PR/ME CUT SHEET S OF * sand square Add oversized leading edge strip plane sand shape wing tips sanded angle sheeted balsa easier sand ing tip blocks shape also produces lighter results Cut ailerons sheeted wing trim down allow balsa edges sand shape Hinge ailerons along centerline using large sturdy freely moving hingesand plenty Cut recesses lower wing surface aileron servo mounting installation aileron servo exten sion cables heat end piece A-in steel rod push through foam core root aileron servo location Removable hatches can stalled over servo areas Butt glue two wing halves wrap center joint wing heavy fiberglass cloth epoxy Use double layers cloth center Fuselage Select firm-to-hard balsa fuselage sides edge gluing splicing necessary achieve size required Glue /16 plywood doublers A-in plywood landing gear block reinforcements balsa wing saddle pieces stab saddle doublers balsa corner strips two fuselage sides before adding bulkheads Glue %-in plywood firewall next three bulkheads sides ing certain install perpendicular angle Glue second side three bulkheads sides parallel firewall wing trailing edge position Note A-in triangle stock used sides front plywood firewall -in triangle stock behind firewall Add A-in plywood wing bolt plate cockpit floor/fuselage reinforce ment piece Pull tail end together stall four rear bulkheads As certain fuselage sides taper straight line bulkhead beside wing trailing edge tail ensuring straight-cut foam top block will fit cor rectly Sheet foam fuselage top pieces /32 balsa Trim sheeting necessary glue place atop basic fuselage structure Reinforce firewall installation heavy fiberglass cloth epoxy ap plied over triangle stock behind fire wall also install several A-in-long No 4 screws through sides firewall extra security against vibration large gas engine can produce Large 8-32 blind nuts tee nuts installed firewall engine mounting bolts Add plywood landing gear mount forward bottom section fuselage Before adding fuselage bottom sheeting cut holes rear bulkheads eleva tor rudder pushrods usually wait until tail surfaces installed wing fitted fuselage before adding fuse lage bottom planlting Engine mount tail surfaces elevator stabilizer fin rudders fiberContinued page 138 September 1989 31 PRECISION MODEL PRODUCTS /ZIIflJ Made USA j7BARSTOCK ALUMINUM SPINNERS RetailAppros PriceWeight $1395058 oz 1495095oz 159510002 1695160oz 1895150oz 1895190oz 2095170or 2295220oz 2495200oz 2695260oz 2895250oz 3695340oz 4995470or 5995520oz 6995570or 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available tn Stzes Add $3 00 Per Sptnner PROP NUT ADAPTORS V Size . 1/4-28 28/7mm .6x1Omm 7x1Omm 5/1624.. 8x1Omm 8x12Smm 3/824 Approx Weight 061 061 or 063 or 082 076 076 02 076 075 sz 117 oz 115 02 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 / *ALL PARTS PRE-CUT & PREPAINTED O4/ BUILD & FLY IN TWO HOURS PAPER AIRPLANES 433 NIHOA STREET KAHULUI HI 96732 USA CATALOG $750 Contains 1000s paper airplanes postage stamp size 6 foot wing span Gliders rubber powered Diecut youcut Largest known source paper airplanes world Cost catalog deducted 1st order over $2500 ASTOUNDINGt CataLog AIR aL4plane aboue $1050 ptua $250 pohaga Letters Editor Continued page 12 sick 60 40 did fine job Keep up Homer Show young kids Beno Echerd South Padre Island TX Safety/Preston Continued page 22 associated gasoline-filled fuel cans let ter did catch eye dated September 1986 came Ernest Razzano li censed A&E mechanic 50 years experi ence Ernies letter responded article previ ous Safety column concerning hazard hav ing fuel cans batteries close proximity sent photos flight box using did use automotive fuel pump dis pense gasoline However Ernie has battery powering fuel pump located separate flight box also houses electric starter phone jack battery box used make electrical connection would welcome letters opinions pro con use electric pumps dispens ing gasoline models particular besides Ernie Razzano using automotive fuel pumps purpose would care tell us about setup Before leaving subject fuel fires/explo sions Jim Baxter Spokane WA sent news paper clipping headline Arson Sus pected Hobby Shop Fire Jim highlighted segment clipping stated 30 50 gallons methanol-based model airplane fuel stored building did ex plode letter Jim commented Since store totally gutted suspect fuel en hanced intensity fire Im sure did reason mentioning newspaper ac count question whether fuel stored metal cans safer plastic jugs guess fuel hobby shop plastic jugs melted allowed fuel burn cans metal its guess may well have exploded Any comments safety metal versus plastic fuel storage containers will welcome responding advertisers mention read about ModelAvlatlon Prime Cut/Sarpolus Continued page 31 glass cowl must trimmed necessary clear engine cylinder Mount cowl using four nylon bolts fit holes tapped fuse lage sides Tap holes A-in plywood aluminum landing gear held place A-in nylon bolts tail surface foam cores also sheeted %2 balsa Cut sheeting apart along hinge lines trim back allow added balsa edging Join horizontal stabilizer halves reinforcing fiberglass cloth epoxy Glue stabilizer fuselage elevators controlled its own servo pushrod Glue vertical fin place rudder linkage via pushrod cables tail wheel steering linked rudder small springs Balsa blocks must shaped installed behind fu selage top pieces side fin recess surfaces accept A-in plywood pieces nylon horns mounted control surfaces ailerons elevators rudder horns retained self-tapping sheet metal screws Epoxy plywood mounts control surfaces recommend using larger 4-40 threaded rods devises linkages Fiberglass tube pushrods used elevator linkages use iAin plywood servo mounts fuse lage Using separate servos elevators its own pushrod allows pushrods perfectly straight Since pushrods cross over within fuselage elevator servos mounted % higher other keep two pushrods rubbing together made up aileron extension cables Y harness two aileron servos mounted wing 1200 mAh battery pack used wrapped foam rubber positioned re cess cut foam fuselage top block bat tery pack can located behind wing posi tion necessary balance Landing gear tail wheel assembly can opy sheet aluminum landing gear can cut %2 aluminum stock available use Morrissey Bravo landing gear Sig Manufac turing Co secured T&D Fiberglass wheel pants inserting two screws through alumi num gear plywood block epoxied inside wheel pants Alternatively Sig B&B Special ties stock mounts wheel collar type leaf-spring tail wheel assembly heavy-duty model CB Associates 16oz fuel tank used space available 138 Model Aviation Paper Flying Scale Model Airplane $700 Part No IT-iSO-B fl175-B fl200B T1-225-B T1-226-B 11-250-B 11-25 1-B 11-275-B 11276-B 11300-B 11301-B 11-325-B 11-350-B 11375-8 TT-400-B Sire .. 1112 .. 13/4 .. 21/4 .. 21/4 FAt .. 21/2 2-1/2FAI . 2314 2314 FAt FAI .. 31/4 3112 . 3-314 . 4 Part No 11140-A TI 147A TT6 10-A TT-7 10-A TI- 516-A IT- 518-A TT-8 10-A 11-825-A IT- 375-A IT- 125-A Retail Price $495 495 495 495 495 495 495 495 595 595 another 16-oz tank smoke system de sired order keep ignition cutoff switch front firewall mounted sheet metal right angle bracket switch han dle protrudes slightly through slot cut fi bergiass cowl receiver antenna pushed nylon tube glued inside fuselage run ning back toward tail Finding large enough plastic bubble canopy aircraft like isnt easy T&D Fiber glass Specialties about source know large canopies might also try kit man ufacturers include large aircraft lines since will usually sell canopies sep arately shape canopy greatly influenc es general appearance type design its important find like Several canopies sold T&D Fiber glass suitable Note version shown plans differs used proto type photos canopy plans basically military style ver sion photos appropriate lightplane home-built aircraft Contact T&D de tails preference tint canopy shows up well use black Tintex dye warm water prevent distorting canopy shape few hours dye bath necessary achieve desired tint Use container large enough fully immerse canopy uniform result black plastic molding used lower edge provides finished appearance canopy attached four screws ply wood tabs glued fuselage top roll bar structure -in doweling quarter-scale-size pilot figure cockpit cut out add realism Propeller muffler cut hole through cowl permit choking carburetor other hole access carb needle valves B&B muffler fitted Quadra Lets face though B&B nearly other nominal muffler available Quadra does little actual muffling solution coupling $295 lawn mower muffler exhaust outlets using homemade adapter quieted things down considerably mower muffler neither too big nor excessively heavy its practical use two dual exhausts added mufflers mounted externally fuselage bottom positioned below landing gear course dont want hang con traptions nice clean aircraftbut theyll job until somebody makes true muffler larger engines reasonably muffled engines much noise comes propel ler As efforts other club members have shown noise level definitely affected shape prop tips Rounded pointed tips produce less noise Ive heard lot gas engine fliers engines produce lower-pitch noise eliminating need addi tional muffling achieving realistic sound general public noise noise Lets keep em quiet used 3/2-in P-SI plastic spinner CB Though looks quite attractive find myself picturing Tru-Turn machined aluminum spinner would look instead now com pany offering larger sizes polished aluminum unit would costly would certainly add pro pizzazz thats hard re sist Covering finishing Plastic film covering accepted norm todays modelers film easier faster apply contrib utes vast weight saving Its quite since put painted finish sport aircraft really dont miss fun doing good paint job used Coverites Black Baron film Prime Cut material new quarter-scale plane built-up structure Per magloss Super Coverite would contribute added strength totally sheeted foamcored model like Prime Cut knew plastic film would work fine Black Baron film requires lower heat set ting application Id previously used 20-year-old-plus heat sealing iron couldnt turned down low enough bought Coverite Black Baron iron pocket thermometers exact monitoring temperature Blackstone coating iron makes nice slippery Its lot easier use old iron lacked coating Using Coverite thermometer found setting around 225 0F worked best allover application film chose basic red-andwhite covering scheme overlapped film about /2 seams Black Baron easy apply showing little tendency bubble soft cloth used rub down bubbles assure total adhesion trimmed white areas blue stripe cut metal straightedge razor blade Black Baron film Positioning care fully ironed stripe place no trouble ironing stretching Black Baron ma terial particularly easy apply around com pound curves such tips tail surfaces Planning use red blue stars trim em phasis picked up some Coverite Graphics Trim Sheets purpose trim sheet material press-on adhesive backed simply pressed place after being cut desired shape Continued page 142 September 1989 139 SPECIALISTS IN CUSTOM COX TEE DEE & REED ENGINES O2OS 0495 051S074S& 09S ALL CUS TOM & STOCK PARTS VAILABLE INDIVIDUALLY COMPETITION ACCESSORIES & CUSTOMIZED K&B ENGINES RACING WHEELS KLOTZ OIL CARBON FIBER SOLID LINES ALL KINDS OF FUEL TUBING FOUR BRANDS OFGLOWPLUGS HA RD-TO-FIND HARD WARE OLD TIMER SUPPLIES COILS CONDENSERS NGK & STIlT SPARK PLUGS SILK 12 COLORS QUALITY DOPE BRUSHES 5& 7LOOP 1/4RUBBER BANDS TRANSISTOR IGNITION SYSTEMS RESISTOR HIGH TENSION LEADS 1/2A TEXACO PLA YBOY SR KIT 1/2A TEXACO ENGINES & PARTS KSB & IGNITION TIMERS RUBBER POWER KITS PROPS TISSUE AND OTHER SUPPLIES CYANOACRYLA TES & EPOXIES ORDER BY MAIL OR PHONE 019 729-4395 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING & HANDLING FEE $200 FOR INSURANCE ADD $100 STOCK ORDERS SHIPPED WITHIN 24 HRS Idle-Bar Glow Plugs Long Shortoniy $1 89 Also. Traditional line non-idle bar Glow Plugs Six Types 3 Heat Ranges High Performance Glow Element Blow Proof Seal Only $149 Swanson Associates PO Box 151 Wayne NJ nce 784a 07470 r PO Box 16621 Dept M Irvine CA 92714 714 250-1107 h. Prime Cut/Sarpolus Continued page 139 However found easier way Coverite offers die-cut sheet stars package containing 62 stars four sizes purchased pack red blue stars lifted off put air plane really easy trimming job Im sold Black Baron film Coverite also offers Black Baron epoxy paint colors match film its available spray cans would good choice fi berglass cowl wheel pants Flying Prime Cut solid stable flier thats nice responsive want wring out youre used flying larger air craft youll need literally adjust sights model appears same size sky smaller would youre flying too far out made lot faraway landings bigger models until learned gauge distance accurately bring closer Large aircraft quite stable landing ap proaches dont bounce around Bleed off speed bring model set plane down gently Aerobatics fun Prime Cut maneuvers require certain amount thought piloting skill cant horse around airplane would Ugly Stik smoke system definitely adds special air show appearance Treat big ones plenty respect thoughan 18-in prop big piece lumber can real damage Always have helper hanging behind aircraft start engine run up Safe flying watchword Radio Technique/Myers Continued page 33 Advanced Unlimited contestant except Basic category con structs figures FAT-CAT elements Free Program Thus figure commonly called Immelmann consists half-loop up ward entered upright level flight 721 K lf-roll exit upright level flight 9l32K4foratotalK l0Thedecimal numbers parentheses FAI-CAT numbers locate particular elements catalog corresponding K-factors Figures judged IAC competition elements no limit number elements can combined create figure long can keep within TACs Acrobatic Zone measures 3300 ft square 3500 ft above ground level AGL top zone 3280 ft AGL Unlimited cate gory bottom zone 1500 ft AGL Basic Sportsman 1200 ft AGL Intermediate 800 ft AGL Ad vanced 328 ft AGL Unlimited An TAC sequence list figures per formed sequentially during trip through Aerobatic Zone has sum K-factors appro priate category being flown order someone ground able judge well flier performs Free Pro gram flier must write paper performed IAC provides forms B C purpose Some judge must check competitors Free Program Forms B C before event involves lot work FAI-CAT adding machinefor both judge competitor Thats reason judges have familiar FAI-CAT TAC categories must fly Known Compul sory sequences made up cat egory published yearly IAC diffi culty flying Known Compulsory sequence increases Basic Unlimited first flight event competitor Known Compulsory also qualifying flight majority judges votes competi tor has demonstrated ability safely control aircraft disqualified category AMA could likewise Let digress Model Aviations Compe tition Newsletter section June 1989 issue pages 139-140 moment will find description IMAC International Miniature Aerobatics Club its compulsory sequences 1989 Aresti diagrams given names figures K factors can see what am discussing has used RC model world since 1974 Its new havent heard about before Now back airplanes can sit IAC has no compulsory advancements category competitors category pilot flies some what dependent airplane because air planes too weak structurally lack suffi cient power perform Advanced Unlimited category figures Intermediate Advanced Unlimited catego ries must also fly Unknown Compulsory Pro gram Unknown Compulsory constructed IAC headquarters supplied contest organizers particular contest Now come peculiarity Only pilots Unlimited category allowed perform Graded Unlimited Four-Minute Free Program program judged Originality K ersatility K armony & Rhythm K xecution K so done OUR REV-UP INVENTORY VERA GES OVER 9000 PROPS ii IMMEDIATE SHIPMENT ON VISAIMC CARBON FIBER LAMINATES Aerospace Composite Products offers variety rigid carbon fiber/epoxy sheets add stiffness almost material- fiberglass foam bal sawood laminates can used reinforce foam wings leading trailing edges wing spars Carbon Fiber bonds easily slow setting cyanoacrylates 5-minute epoxies laminate can stripped narrower widths CL-i 007 thick 1x48-$500 1x72-$700 CL-2 014 thick 1x48-$800 1x72-$1100 Send SASE information additional sizes products Add S300 shipping handling Calif residents add 6% tax Overseas orders add 15%-Order COD send check money order w r41 1nh1z VIIIIIII 1It5iIIIII51I source lightweight materials
Edition: Model Aviation - 1989/09
Page Numbers: 24, 25, 26, 27, 28, 29, 30, 31, 138, 139, 142
NO OCR TEXT NO OCR TEXT replicating particular design Original ity its strong suit Derived primarily Pik- 15 dash two other successful forerunners like Cap Laser Chipmunk RV-3 Akro its emi nently practical sport aircraft melds proven aerodynamic parameters very easy construction techniques Though its pace slower Pattern aircraft Prime Cut capable almost L access hatch cover wing bottom surface aileron control rod aileron controlled its own servo aerobatic maneuver Its steady re liable airplane takeoffs easy model can slowed down sufficiently achieve reasonably relaxed landings ever Prime Cut hardly trainer airplane big wing loading high pilot has really pay atten tion Id suggest model first step quarter-scale arena Its nice engine shots show complete access fiberglass cowl removed left close-up upside-down-mounted Quadra 40 engine 18-in prop 3-in CB plastic spinner ignition on-off switch mounted firewall handle protruding slightly through cowl photo right shows simple foam-and-tube structure fuselage exhaust system consist ing B&B muffler coupled lawn mower muffler reduce noise adapter consists two copper plumbing elbows brass tubing 26 Model Aviation view shows sleek lines big tail-dragger its tapered wing planform fully symmetrical airfoil covering Coverite Black Baron film Coverite graphics L Close-up canopy showing Wil liams Brothers -scale pilot complete dark glasses roll bar adding nice touch realism model canopy commercially available T&D Fiber glass Specialties Tinting black Tintex * view top center section wing shows 1/4-In plywood wing mounting key tongue used lieu common dowel arrangement author finds system easier install easier adjust good fit aileron servo lead seen extend ing wing Name address label wing suits AMA identification requirement ick Sarpolus N COWL PVY* DOW I. STRUCTURE3/3z BALSA &HEET OiE TECTFOAM CORE A &HEEI.j .- .___ -I 51- -- PLYL8HEET N - BALSA WING $1DDLE SQ BALSA BALSA BJOCJ / ALUMgPL 3/5 PL DOUBLiR SIG BRA&FOAM CORE LANDING CD GFAR CD 3/5BfL8ALE N 0 Co TI P& size airplanes apparent photo author left his friend Lou McGuire right showing off respective models Lous plane also powered Quadra 40 distinguished its Chipmunk-like trim scheme different canopy Lous airplane finished several months before authors benefited Lous flying experience Modifications incorporated landing gear based what Lou learned bottom shot wing off shows interior arrangement Four servos mounted side by-side across fuselage Two servos elevator control surface giving redundancy control power other two throttle rudder control Note use two lawn mower mufflers coupled B&B muffler attempt quiet large engine lack effective mufflers market large engines real problem change 40 60 size shipa bit challenge makes fun Construction sufficiently straightfor ward capable modelers will have no problems building supplies readily available fiberglass cowling wheel pants well plastic canopy available T&D Fiberglass alumi num landing gear Bravo unit Sig Manufacturing Co other hardware commercially available dont have local foam cutter foam cores can pur chased Robins Wing Balsa ply wood available locally through mail order suppliers surmise overall cost comparable less com mercial kit aircraft size friend Lou McGuire began work Prime Cut same time did Lou finished flying several months before Lous experience aircraft led us beef up landing gear mounting additional strength As shown plans has worked out well came time test fly Prime Cut knew little worry about Nevertheless took usual bundle photographs model before first flight though cant remember ever losing plane its debut always take RE/IFORCE FIRI FIBERGLASS COWL/ WITH FIBERBLM AIID EPOKY IIII III I III 11111 Ill' 'Ii IIII k4 TRIANGLEip TRIANGLE STOCKSTOCK FIBERBLASS COWL P1K-IS WHEEL PANTS NO IN AND PLASTIC CANOPY AVAILABLE FROM r o FIBERGLASS 30355 BLOCK GARDEN CITY NI 4B135 S I/B SPINNERS/SI BALSA TOP SECTID cI 91FUEL TANK Ic~I r~I ~II 41 IIi 4 - ~II I/BPLYBALSA QUADRA 55 OR 40ATTACi RECOMMENDEDWING 1/4 PLYWOOD LANDING BEAR MOUNTS FIBERGLASS WHEEL PANTS 4 I/I WHEELS photo record precautionary measure first flight uneventfuluntil midair After takeoff making few ele vator trim adjustments Lou executed some rolls loops snap rolls began making low passes photogra pher concentration must have tal because didnt notice other plane until too late heard crash watched helplessly pieces airplane flut tered through sky Interestingly other midair occurred less 30 minutes later plane surviving Prime Cut withstood impact well could expected Though radio engine survived wing tail surfaces could reused fuselage destroyed Im process construct ing new fuselage hope airborne again before long Still its just well took preflight photos Construction Prime Cuts structure follows conventional foam core design youre ready scratch-built project size youve probably already developed own preferred building techniques 28 Model Aviation Full-Size Plans Available. See Page 180 I/4 BALSA I4BALSA 3/G BALSA TOP FUSELAGE SHEETING NOT SHOWN IG PLYWOOD FUSELAGE STIFFENERIN THIS VIEW FOR CLARITYJ55 BALSA/ FIN/RLDGR TWO ELEVATON SERVOS WITH/K SEPARATE LINKAGE TO EACH ELEVATOR RECOMMENDED SQUAREI4BALSA RECEIVER SERVOS I /iI __-__ ii- _ I* IG BALSA IIG PLY DOUBLERIG BALSADOUBLERI/B PLYCB ASSOCIATES FUSELAGE SIDESTAIL WHEEL FUSELAGE SECTIONL4- SOTO HEREAND BOTTOMIM BALSAASSEMBLY ATTACHED TO WINGNYLON BOLTSTRIABBLE STOCK IB BALSA WING SADDLE PIECESMODEL AVIATION MAGAZINE PRIME CUT 10/N THE ACADEN OF MODEL AERONAUTICS FLY SAFELY AID QUIETLY O I5 5 4 B 67 BB ID II IS SPORTAEROBATIC AIRCRAFT FOR LARGER ENGINES DESIGNED AND DRAWN BY DICK SARPOLUS SHEET OF B cant find local source foam core cutting recommend Aerosmith Model Aviation RD #1 Box 290 Athens NY 12015 foam cores sheeted Y32 dium-weight balsa edge glued necessary needed width Ive used t2v Browns Southern Sorghum contact finished model wings shown supported simple foam block/cardboard tube assembly under landing gear keep weight off wheels airplane left standing prevents flat spots wheels canopy cowling wheel pants commercially available T&D Fiberglass Specialties landing gear can made up %2-in aluminum stock purchase Morrisey Bravo unit Sig Manufacturing Co cement years complete suc cess builders prefer using epoxy glue thinly applied 3M No 77 spray contact cement adhere skins September 1989 29 JJTK/F ii 11 1f4 PLYWOOD WING BOLT PLATE 00 Closeup bottom tuui nuwung CB Associates heavyduty leaf spring tail wheel assembly steering linkage tached rudder pushrod elevator pushrods Theres separate pushrod elevator devises pushrod ends heavyduty 440 size jam nuts keepers elevator devises /4 PLY WING NOUAT KEY WRAP CENTER SECT/ON Ii U9PLYWOOO A/ES I/4 PLYWOOD WINE MOUNT KEY \3/4 DOWEL TRIM FLUSN NTR NINE SWFACE DEPORE P/AERGLASS/NG I/A PLY 5 V5 PLY P/RE WALL 1/4 PLYWOOD 0 / S S S, cores Wing plywood wing mounting tongue substituted commonly used dowels wing positioning reinforced installing plywood rib root wing cores prefer mounting tongue dowels since contact area fuselage bulkhead retaining wing mount can trimmed shimmed necessary get correct wing-to-fuselage fit wing core sheeted top bottom trim off leading edge block Left shot catches aircraft climbs out its first takeoff Right its aerobatic capability undisputable dramatic photo Un fortunately lust moments later suffered midair collision extensively damaged fuselage completely replaced Prime Cut can mounted twin floats off-water flying fun foam core floats 48 x 6 have additional sheet aiuminum support strut bolted fuselage hind wing water rudder aft end float coupled aircraft rudder preparing lakeolT i ne auinor seems listening last-minute instructions Lou McGulre another member Jersey Coast Sportfliers Club just prior takeoff run tail wheel off ground Prime Cut just point smoothly lifting off Full-Size Plans Available. Page 180 SECT/ON Ar ROLASS CLOTH AND EPOXYLAYER OVER CENTER JO/NT J/N BALSA LEAD/NB EDGE SHEET WINO WITH -3/iS BALSA /NSTALL AILERON SERVOS IN WINO _____ WITH ACCESS RATCH ON BOTTOM SURFACE HOLE THROUGH FOAM CORE FOR SERVO EXTENSION CABLE ET COMPLETE WING W CUT AILERONS FREE FIN/SN EDGES I/B BALSA I\ Il 5/SB BALSA SHEETING CENTER LIRE I/U BALSA BULKHEADS ~ii 1/4 BALSA AILERON CROSS SECT/ON FOAM STABILIZER TEMPLATES USE HEAVY DI/TY N/RUES FOAM FIN/RWDER TEMPLATES 5/55 TEMPERED ALUM/MUM LARDING GEAR OR USE BIG MFG COS BRAVO LARDING GEAR hz FOAM WING CONE TEMPLATES BLOCK 11 I BALSA TIPS FOAM CORE FUSELAGE TOP BLOCK TEMPLATES 1/4 BALSA EDGES II J U I II PR/ME CUT SHEET S OF * sand square Add oversized leading edge strip plane sand shape wing tips sanded angle sheeted balsa easier sand ing tip blocks shape also produces lighter results Cut ailerons sheeted wing trim down allow balsa edges sand shape Hinge ailerons along centerline using large sturdy freely moving hingesand plenty Cut recesses lower wing surface aileron servo mounting installation aileron servo exten sion cables heat end piece A-in steel rod push through foam core root aileron servo location Removable hatches can stalled over servo areas Butt glue two wing halves wrap center joint wing heavy fiberglass cloth epoxy Use double layers cloth center Fuselage Select firm-to-hard balsa fuselage sides edge gluing splicing necessary achieve size required Glue /16 plywood doublers A-in plywood landing gear block reinforcements balsa wing saddle pieces stab saddle doublers balsa corner strips two fuselage sides before adding bulkheads Glue %-in plywood firewall next three bulkheads sides ing certain install perpendicular angle Glue second side three bulkheads sides parallel firewall wing trailing edge position Note A-in triangle stock used sides front plywood firewall -in triangle stock behind firewall Add A-in plywood wing bolt plate cockpit floor/fuselage reinforce ment piece Pull tail end together stall four rear bulkheads As certain fuselage sides taper straight line bulkhead beside wing trailing edge tail ensuring straight-cut foam top block will fit cor rectly Sheet foam fuselage top pieces /32 balsa Trim sheeting necessary glue place atop basic fuselage structure Reinforce firewall installation heavy fiberglass cloth epoxy ap plied over triangle stock behind fire wall also install several A-in-long No 4 screws through sides firewall extra security against vibration large gas engine can produce Large 8-32 blind nuts tee nuts installed firewall engine mounting bolts Add plywood landing gear mount forward bottom section fuselage Before adding fuselage bottom sheeting cut holes rear bulkheads eleva tor rudder pushrods usually wait until tail surfaces installed wing fitted fuselage before adding fuse lage bottom planlting Engine mount tail surfaces elevator stabilizer fin rudders fiberContinued page 138 September 1989 31 PRECISION MODEL PRODUCTS /ZIIflJ Made USA j7BARSTOCK ALUMINUM SPINNERS RetailAppros PriceWeight $1395058 oz 1495095oz 159510002 1695160oz 1895150oz 1895190oz 2095170or 2295220oz 2495200oz 2695260oz 2895250oz 3695340oz 4995470or 5995520oz 6995570or 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available tn Stzes Add $3 00 Per Sptnner PROP NUT ADAPTORS V Size . 1/4-28 28/7mm .6x1Omm 7x1Omm 5/1624.. 8x1Omm 8x12Smm 3/824 Approx Weight 061 061 or 063 or 082 076 076 02 076 075 sz 117 oz 115 02 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 / *ALL PARTS PRE-CUT & PREPAINTED O4/ BUILD & FLY IN TWO HOURS PAPER AIRPLANES 433 NIHOA STREET KAHULUI HI 96732 USA CATALOG $750 Contains 1000s paper airplanes postage stamp size 6 foot wing span Gliders rubber powered Diecut youcut Largest known source paper airplanes world Cost catalog deducted 1st order over $2500 ASTOUNDINGt CataLog AIR aL4plane aboue $1050 ptua $250 pohaga Letters Editor Continued page 12 sick 60 40 did fine job Keep up Homer Show young kids Beno Echerd South Padre Island TX Safety/Preston Continued page 22 associated gasoline-filled fuel cans let ter did catch eye dated September 1986 came Ernest Razzano li censed A&E mechanic 50 years experi ence Ernies letter responded article previ ous Safety column concerning hazard hav ing fuel cans batteries close proximity sent photos flight box using did use automotive fuel pump dis pense gasoline However Ernie has battery powering fuel pump located separate flight box also houses electric starter phone jack battery box used make electrical connection would welcome letters opinions pro con use electric pumps dispens ing gasoline models particular besides Ernie Razzano using automotive fuel pumps purpose would care tell us about setup Before leaving subject fuel fires/explo sions Jim Baxter Spokane WA sent news paper clipping headline Arson Sus pected Hobby Shop Fire Jim highlighted segment clipping stated 30 50 gallons methanol-based model airplane fuel stored building did ex plode letter Jim commented Since store totally gutted suspect fuel en hanced intensity fire Im sure did reason mentioning newspaper ac count question whether fuel stored metal cans safer plastic jugs guess fuel hobby shop plastic jugs melted allowed fuel burn cans metal its guess may well have exploded Any comments safety metal versus plastic fuel storage containers will welcome responding advertisers mention read about ModelAvlatlon Prime Cut/Sarpolus Continued page 31 glass cowl must trimmed necessary clear engine cylinder Mount cowl using four nylon bolts fit holes tapped fuse lage sides Tap holes A-in plywood aluminum landing gear held place A-in nylon bolts tail surface foam cores also sheeted %2 balsa Cut sheeting apart along hinge lines trim back allow added balsa edging Join horizontal stabilizer halves reinforcing fiberglass cloth epoxy Glue stabilizer fuselage elevators controlled its own servo pushrod Glue vertical fin place rudder linkage via pushrod cables tail wheel steering linked rudder small springs Balsa blocks must shaped installed behind fu selage top pieces side fin recess surfaces accept A-in plywood pieces nylon horns mounted control surfaces ailerons elevators rudder horns retained self-tapping sheet metal screws Epoxy plywood mounts control surfaces recommend using larger 4-40 threaded rods devises linkages Fiberglass tube pushrods used elevator linkages use iAin plywood servo mounts fuse lage Using separate servos elevators its own pushrod allows pushrods perfectly straight Since pushrods cross over within fuselage elevator servos mounted % higher other keep two pushrods rubbing together made up aileron extension cables Y harness two aileron servos mounted wing 1200 mAh battery pack used wrapped foam rubber positioned re cess cut foam fuselage top block bat tery pack can located behind wing posi tion necessary balance Landing gear tail wheel assembly can opy sheet aluminum landing gear can cut %2 aluminum stock available use Morrissey Bravo landing gear Sig Manufac turing Co secured T&D Fiberglass wheel pants inserting two screws through alumi num gear plywood block epoxied inside wheel pants Alternatively Sig B&B Special ties stock mounts wheel collar type leaf-spring tail wheel assembly heavy-duty model CB Associates 16oz fuel tank used space available 138 Model Aviation Paper Flying Scale Model Airplane $700 Part No IT-iSO-B fl175-B fl200B T1-225-B T1-226-B 11-250-B 11-25 1-B 11-275-B 11276-B 11300-B 11301-B 11-325-B 11-350-B 11375-8 TT-400-B Sire .. 1112 .. 13/4 .. 21/4 .. 21/4 FAt .. 21/2 2-1/2FAI . 2314 2314 FAt FAI .. 31/4 3112 . 3-314 . 4 Part No 11140-A TI 147A TT6 10-A TT-7 10-A TI- 516-A IT- 518-A TT-8 10-A 11-825-A IT- 375-A IT- 125-A Retail Price $495 495 495 495 495 495 495 495 595 595 another 16-oz tank smoke system de sired order keep ignition cutoff switch front firewall mounted sheet metal right angle bracket switch han dle protrudes slightly through slot cut fi bergiass cowl receiver antenna pushed nylon tube glued inside fuselage run ning back toward tail Finding large enough plastic bubble canopy aircraft like isnt easy T&D Fiber glass Specialties about source know large canopies might also try kit man ufacturers include large aircraft lines since will usually sell canopies sep arately shape canopy greatly influenc es general appearance type design its important find like Several canopies sold T&D Fiber glass suitable Note version shown plans differs used proto type photos canopy plans basically military style ver sion photos appropriate lightplane home-built aircraft Contact T&D de tails preference tint canopy shows up well use black Tintex dye warm water prevent distorting canopy shape few hours dye bath necessary achieve desired tint Use container large enough fully immerse canopy uniform result black plastic molding used lower edge provides finished appearance canopy attached four screws ply wood tabs glued fuselage top roll bar structure -in doweling quarter-scale-size pilot figure cockpit cut out add realism Propeller muffler cut hole through cowl permit choking carburetor other hole access carb needle valves B&B muffler fitted Quadra Lets face though B&B nearly other nominal muffler available Quadra does little actual muffling solution coupling $295 lawn mower muffler exhaust outlets using homemade adapter quieted things down considerably mower muffler neither too big nor excessively heavy its practical use two dual exhausts added mufflers mounted externally fuselage bottom positioned below landing gear course dont want hang con traptions nice clean aircraftbut theyll job until somebody makes true muffler larger engines reasonably muffled engines much noise comes propel ler As efforts other club members have shown noise level definitely affected shape prop tips Rounded pointed tips produce less noise Ive heard lot gas engine fliers engines produce lower-pitch noise eliminating need addi tional muffling achieving realistic sound general public noise noise Lets keep em quiet used 3/2-in P-SI plastic spinner CB Though looks quite attractive find myself picturing Tru-Turn machined aluminum spinner would look instead now com pany offering larger sizes polished aluminum unit would costly would certainly add pro pizzazz thats hard re sist Covering finishing Plastic film covering accepted norm todays modelers film easier faster apply contrib utes vast weight saving Its quite since put painted finish sport aircraft really dont miss fun doing good paint job used Coverites Black Baron film Prime Cut material new quarter-scale plane built-up structure Per magloss Super Coverite would contribute added strength totally sheeted foamcored model like Prime Cut knew plastic film would work fine Black Baron film requires lower heat set ting application Id previously used 20-year-old-plus heat sealing iron couldnt turned down low enough bought Coverite Black Baron iron pocket thermometers exact monitoring temperature Blackstone coating iron makes nice slippery Its lot easier use old iron lacked coating Using Coverite thermometer found setting around 225 0F worked best allover application film chose basic red-andwhite covering scheme overlapped film about /2 seams Black Baron easy apply showing little tendency bubble soft cloth used rub down bubbles assure total adhesion trimmed white areas blue stripe cut metal straightedge razor blade Black Baron film Positioning care fully ironed stripe place no trouble ironing stretching Black Baron ma terial particularly easy apply around com pound curves such tips tail surfaces Planning use red blue stars trim em phasis picked up some Coverite Graphics Trim Sheets purpose trim sheet material press-on adhesive backed simply pressed place after being cut desired shape Continued page 142 September 1989 139 SPECIALISTS IN CUSTOM COX TEE DEE & REED ENGINES O2OS 0495 051S074S& 09S ALL CUS TOM & STOCK PARTS VAILABLE INDIVIDUALLY COMPETITION ACCESSORIES & CUSTOMIZED K&B ENGINES RACING WHEELS KLOTZ OIL CARBON FIBER SOLID LINES ALL KINDS OF FUEL TUBING FOUR BRANDS OFGLOWPLUGS HA RD-TO-FIND HARD WARE OLD TIMER SUPPLIES COILS CONDENSERS NGK & STIlT SPARK PLUGS SILK 12 COLORS QUALITY DOPE BRUSHES 5& 7LOOP 1/4RUBBER BANDS TRANSISTOR IGNITION SYSTEMS RESISTOR HIGH TENSION LEADS 1/2A TEXACO PLA YBOY SR KIT 1/2A TEXACO ENGINES & PARTS KSB & IGNITION TIMERS RUBBER POWER KITS PROPS TISSUE AND OTHER SUPPLIES CYANOACRYLA TES & EPOXIES ORDER BY MAIL OR PHONE 019 729-4395 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING & HANDLING FEE $200 FOR INSURANCE ADD $100 STOCK ORDERS SHIPPED WITHIN 24 HRS Idle-Bar Glow Plugs Long Shortoniy $1 89 Also. Traditional line non-idle bar Glow Plugs Six Types 3 Heat Ranges High Performance Glow Element Blow Proof Seal Only $149 Swanson Associates PO Box 151 Wayne NJ nce 784a 07470 r PO Box 16621 Dept M Irvine CA 92714 714 250-1107 h. Prime Cut/Sarpolus Continued page 139 However found easier way Coverite offers die-cut sheet stars package containing 62 stars four sizes purchased pack red blue stars lifted off put air plane really easy trimming job Im sold Black Baron film Coverite also offers Black Baron epoxy paint colors match film its available spray cans would good choice fi berglass cowl wheel pants Flying Prime Cut solid stable flier thats nice responsive want wring out youre used flying larger air craft youll need literally adjust sights model appears same size sky smaller would youre flying too far out made lot faraway landings bigger models until learned gauge distance accurately bring closer Large aircraft quite stable landing ap proaches dont bounce around Bleed off speed bring model set plane down gently Aerobatics fun Prime Cut maneuvers require certain amount thought piloting skill cant horse around airplane would Ugly Stik smoke system definitely adds special air show appearance Treat big ones plenty respect thoughan 18-in prop big piece lumber can real damage Always have helper hanging behind aircraft start engine run up Safe flying watchword Radio Technique/Myers Continued page 33 Advanced Unlimited contestant except Basic category con structs figures FAT-CAT elements Free Program Thus figure commonly called Immelmann consists half-loop up ward entered upright level flight 721 K lf-roll exit upright level flight 9l32K4foratotalK l0Thedecimal numbers parentheses FAI-CAT numbers locate particular elements catalog corresponding K-factors Figures judged IAC competition elements no limit number elements can combined create figure long can keep within TACs Acrobatic Zone measures 3300 ft square 3500 ft above ground level AGL top zone 3280 ft AGL Unlimited cate gory bottom zone 1500 ft AGL Basic Sportsman 1200 ft AGL Intermediate 800 ft AGL Ad vanced 328 ft AGL Unlimited An TAC sequence list figures per formed sequentially during trip through Aerobatic Zone has sum K-factors appro priate category being flown order someone ground able judge well flier performs Free Pro gram flier must write paper performed IAC provides forms B C purpose Some judge must check competitors Free Program Forms B C before event involves lot work FAI-CAT adding machinefor both judge competitor Thats reason judges have familiar FAI-CAT TAC categories must fly Known Compul sory sequences made up cat egory published yearly IAC diffi culty flying Known Compulsory sequence increases Basic Unlimited first flight event competitor Known Compulsory also qualifying flight majority judges votes competi tor has demonstrated ability safely control aircraft disqualified category AMA could likewise Let digress Model Aviations Compe tition Newsletter section June 1989 issue pages 139-140 moment will find description IMAC International Miniature Aerobatics Club its compulsory sequences 1989 Aresti diagrams given names figures K factors can see what am discussing has used RC model world since 1974 Its new havent heard about before Now back airplanes can sit IAC has no compulsory advancements category competitors category pilot flies some what dependent airplane because air planes too weak structurally lack suffi cient power perform Advanced Unlimited category figures Intermediate Advanced Unlimited catego ries must also fly Unknown Compulsory Pro gram Unknown Compulsory constructed IAC headquarters supplied contest organizers particular contest Now come peculiarity Only pilots Unlimited category allowed perform Graded Unlimited Four-Minute Free Program program judged Originality K ersatility K armony & Rhythm K xecution K so done OUR REV-UP INVENTORY VERA GES OVER 9000 PROPS ii IMMEDIATE SHIPMENT ON VISAIMC CARBON FIBER LAMINATES Aerospace Composite Products offers variety rigid carbon fiber/epoxy sheets add stiffness almost material- fiberglass foam bal sawood laminates can used reinforce foam wings leading trailing edges wing spars Carbon Fiber bonds easily slow setting cyanoacrylates 5-minute epoxies laminate can stripped narrower widths CL-i 007 thick 1x48-$500 1x72-$700 CL-2 014 thick 1x48-$800 1x72-$1100 Send SASE information additional sizes products Add S300 shipping handling Calif residents add 6% tax Overseas orders add 15%-Order COD send check money order w r41 1nh1z VIIIIIII 1It5iIIIII51I source lightweight materials
Edition: Model Aviation - 1989/09
Page Numbers: 24, 25, 26, 27, 28, 29, 30, 31, 138, 139, 142
NO OCR TEXT NO OCR TEXT replicating particular design Original ity its strong suit Derived primarily Pik- 15 dash two other successful forerunners like Cap Laser Chipmunk RV-3 Akro its emi nently practical sport aircraft melds proven aerodynamic parameters very easy construction techniques Though its pace slower Pattern aircraft Prime Cut capable almost L access hatch cover wing bottom surface aileron control rod aileron controlled its own servo aerobatic maneuver Its steady re liable airplane takeoffs easy model can slowed down sufficiently achieve reasonably relaxed landings ever Prime Cut hardly trainer airplane big wing loading high pilot has really pay atten tion Id suggest model first step quarter-scale arena Its nice engine shots show complete access fiberglass cowl removed left close-up upside-down-mounted Quadra 40 engine 18-in prop 3-in CB plastic spinner ignition on-off switch mounted firewall handle protruding slightly through cowl photo right shows simple foam-and-tube structure fuselage exhaust system consist ing B&B muffler coupled lawn mower muffler reduce noise adapter consists two copper plumbing elbows brass tubing 26 Model Aviation view shows sleek lines big tail-dragger its tapered wing planform fully symmetrical airfoil covering Coverite Black Baron film Coverite graphics L Close-up canopy showing Wil liams Brothers -scale pilot complete dark glasses roll bar adding nice touch realism model canopy commercially available T&D Fiber glass Specialties Tinting black Tintex * view top center section wing shows 1/4-In plywood wing mounting key tongue used lieu common dowel arrangement author finds system easier install easier adjust good fit aileron servo lead seen extend ing wing Name address label wing suits AMA identification requirement ick Sarpolus N COWL PVY* DOW I. STRUCTURE3/3z BALSA &HEET OiE TECTFOAM CORE A &HEEI.j .- .___ -I 51- -- PLYL8HEET N - BALSA WING $1DDLE SQ BALSA BALSA BJOCJ / ALUMgPL 3/5 PL DOUBLiR SIG BRA&FOAM CORE LANDING CD GFAR CD 3/5BfL8ALE N 0 Co TI P& size airplanes apparent photo author left his friend Lou McGuire right showing off respective models Lous plane also powered Quadra 40 distinguished its Chipmunk-like trim scheme different canopy Lous airplane finished several months before authors benefited Lous flying experience Modifications incorporated landing gear based what Lou learned bottom shot wing off shows interior arrangement Four servos mounted side by-side across fuselage Two servos elevator control surface giving redundancy control power other two throttle rudder control Note use two lawn mower mufflers coupled B&B muffler attempt quiet large engine lack effective mufflers market large engines real problem change 40 60 size shipa bit challenge makes fun Construction sufficiently straightfor ward capable modelers will have no problems building supplies readily available fiberglass cowling wheel pants well plastic canopy available T&D Fiberglass alumi num landing gear Bravo unit Sig Manufacturing Co other hardware commercially available dont have local foam cutter foam cores can pur chased Robins Wing Balsa ply wood available locally through mail order suppliers surmise overall cost comparable less com mercial kit aircraft size friend Lou McGuire began work Prime Cut same time did Lou finished flying several months before Lous experience aircraft led us beef up landing gear mounting additional strength As shown plans has worked out well came time test fly Prime Cut knew little worry about Nevertheless took usual bundle photographs model before first flight though cant remember ever losing plane its debut always take RE/IFORCE FIRI FIBERGLASS COWL/ WITH FIBERBLM AIID EPOKY IIII III I III 11111 Ill' 'Ii IIII k4 TRIANGLEip TRIANGLE STOCKSTOCK FIBERBLASS COWL P1K-IS WHEEL PANTS NO IN AND PLASTIC CANOPY AVAILABLE FROM r o FIBERGLASS 30355 BLOCK GARDEN CITY NI 4B135 S I/B SPINNERS/SI BALSA TOP SECTID cI 91FUEL TANK Ic~I r~I ~II 41 IIi 4 - ~II I/BPLYBALSA QUADRA 55 OR 40ATTACi RECOMMENDEDWING 1/4 PLYWOOD LANDING BEAR MOUNTS FIBERGLASS WHEEL PANTS 4 I/I WHEELS photo record precautionary measure first flight uneventfuluntil midair After takeoff making few ele vator trim adjustments Lou executed some rolls loops snap rolls began making low passes photogra pher concentration must have tal because didnt notice other plane until too late heard crash watched helplessly pieces airplane flut tered through sky Interestingly other midair occurred less 30 minutes later plane surviving Prime Cut withstood impact well could expected Though radio engine survived wing tail surfaces could reused fuselage destroyed Im process construct ing new fuselage hope airborne again before long Still its just well took preflight photos Construction Prime Cuts structure follows conventional foam core design youre ready scratch-built project size youve probably already developed own preferred building techniques 28 Model Aviation Full-Size Plans Available. See Page 180 I/4 BALSA I4BALSA 3/G BALSA TOP FUSELAGE SHEETING NOT SHOWN IG PLYWOOD FUSELAGE STIFFENERIN THIS VIEW FOR CLARITYJ55 BALSA/ FIN/RLDGR TWO ELEVATON SERVOS WITH/K SEPARATE LINKAGE TO EACH ELEVATOR RECOMMENDED SQUAREI4BALSA RECEIVER SERVOS I /iI __-__ ii- _ I* IG BALSA IIG PLY DOUBLERIG BALSADOUBLERI/B PLYCB ASSOCIATES FUSELAGE SIDESTAIL WHEEL FUSELAGE SECTIONL4- SOTO HEREAND BOTTOMIM BALSAASSEMBLY ATTACHED TO WINGNYLON BOLTSTRIABBLE STOCK IB BALSA WING SADDLE PIECESMODEL AVIATION MAGAZINE PRIME CUT 10/N THE ACADEN OF MODEL AERONAUTICS FLY SAFELY AID QUIETLY O I5 5 4 B 67 BB ID II IS SPORTAEROBATIC AIRCRAFT FOR LARGER ENGINES DESIGNED AND DRAWN BY DICK SARPOLUS SHEET OF B cant find local source foam core cutting recommend Aerosmith Model Aviation RD #1 Box 290 Athens NY 12015 foam cores sheeted Y32 dium-weight balsa edge glued necessary needed width Ive used t2v Browns Southern Sorghum contact finished model wings shown supported simple foam block/cardboard tube assembly under landing gear keep weight off wheels airplane left standing prevents flat spots wheels canopy cowling wheel pants commercially available T&D Fiberglass Specialties landing gear can made up %2-in aluminum stock purchase Morrisey Bravo unit Sig Manufacturing Co cement years complete suc cess builders prefer using epoxy glue thinly applied 3M No 77 spray contact cement adhere skins September 1989 29 JJTK/F ii 11 1f4 PLYWOOD WING BOLT PLATE 00 Closeup bottom tuui nuwung CB Associates heavyduty leaf spring tail wheel assembly steering linkage tached rudder pushrod elevator pushrods Theres separate pushrod elevator devises pushrod ends heavyduty 440 size jam nuts keepers elevator devises /4 PLY WING NOUAT KEY WRAP CENTER SECT/ON Ii U9PLYWOOO A/ES I/4 PLYWOOD WINE MOUNT KEY \3/4 DOWEL TRIM FLUSN NTR NINE SWFACE DEPORE P/AERGLASS/NG I/A PLY 5 V5 PLY P/RE WALL 1/4 PLYWOOD 0 / S S S, cores Wing plywood wing mounting tongue substituted commonly used dowels wing positioning reinforced installing plywood rib root wing cores prefer mounting tongue dowels since contact area fuselage bulkhead retaining wing mount can trimmed shimmed necessary get correct wing-to-fuselage fit wing core sheeted top bottom trim off leading edge block Left shot catches aircraft climbs out its first takeoff Right its aerobatic capability undisputable dramatic photo Un fortunately lust moments later suffered midair collision extensively damaged fuselage completely replaced Prime Cut can mounted twin floats off-water flying fun foam core floats 48 x 6 have additional sheet aiuminum support strut bolted fuselage hind wing water rudder aft end float coupled aircraft rudder preparing lakeolT i ne auinor seems listening last-minute instructions Lou McGulre another member Jersey Coast Sportfliers Club just prior takeoff run tail wheel off ground Prime Cut just point smoothly lifting off Full-Size Plans Available. Page 180 SECT/ON Ar ROLASS CLOTH AND EPOXYLAYER OVER CENTER JO/NT J/N BALSA LEAD/NB EDGE SHEET WINO WITH -3/iS BALSA /NSTALL AILERON SERVOS IN WINO _____ WITH ACCESS RATCH ON BOTTOM SURFACE HOLE THROUGH FOAM CORE FOR SERVO EXTENSION CABLE ET COMPLETE WING W CUT AILERONS FREE FIN/SN EDGES I/B BALSA I\ Il 5/SB BALSA SHEETING CENTER LIRE I/U BALSA BULKHEADS ~ii 1/4 BALSA AILERON CROSS SECT/ON FOAM STABILIZER TEMPLATES USE HEAVY DI/TY N/RUES FOAM FIN/RWDER TEMPLATES 5/55 TEMPERED ALUM/MUM LARDING GEAR OR USE BIG MFG COS BRAVO LARDING GEAR hz FOAM WING CONE TEMPLATES BLOCK 11 I BALSA TIPS FOAM CORE FUSELAGE TOP BLOCK TEMPLATES 1/4 BALSA EDGES II J U I II PR/ME CUT SHEET S OF * sand square Add oversized leading edge strip plane sand shape wing tips sanded angle sheeted balsa easier sand ing tip blocks shape also produces lighter results Cut ailerons sheeted wing trim down allow balsa edges sand shape Hinge ailerons along centerline using large sturdy freely moving hingesand plenty Cut recesses lower wing surface aileron servo mounting installation aileron servo exten sion cables heat end piece A-in steel rod push through foam core root aileron servo location Removable hatches can stalled over servo areas Butt glue two wing halves wrap center joint wing heavy fiberglass cloth epoxy Use double layers cloth center Fuselage Select firm-to-hard balsa fuselage sides edge gluing splicing necessary achieve size required Glue /16 plywood doublers A-in plywood landing gear block reinforcements balsa wing saddle pieces stab saddle doublers balsa corner strips two fuselage sides before adding bulkheads Glue %-in plywood firewall next three bulkheads sides ing certain install perpendicular angle Glue second side three bulkheads sides parallel firewall wing trailing edge position Note A-in triangle stock used sides front plywood firewall -in triangle stock behind firewall Add A-in plywood wing bolt plate cockpit floor/fuselage reinforce ment piece Pull tail end together stall four rear bulkheads As certain fuselage sides taper straight line bulkhead beside wing trailing edge tail ensuring straight-cut foam top block will fit cor rectly Sheet foam fuselage top pieces /32 balsa Trim sheeting necessary glue place atop basic fuselage structure Reinforce firewall installation heavy fiberglass cloth epoxy ap plied over triangle stock behind fire wall also install several A-in-long No 4 screws through sides firewall extra security against vibration large gas engine can produce Large 8-32 blind nuts tee nuts installed firewall engine mounting bolts Add plywood landing gear mount forward bottom section fuselage Before adding fuselage bottom sheeting cut holes rear bulkheads eleva tor rudder pushrods usually wait until tail surfaces installed wing fitted fuselage before adding fuse lage bottom planlting Engine mount tail surfaces elevator stabilizer fin rudders fiberContinued page 138 September 1989 31 PRECISION MODEL PRODUCTS /ZIIflJ Made USA j7BARSTOCK ALUMINUM SPINNERS RetailAppros PriceWeight $1395058 oz 1495095oz 159510002 1695160oz 1895150oz 1895190oz 2095170or 2295220oz 2495200oz 2695260oz 2895250oz 3695340oz 4995470or 5995520oz 6995570or 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available tn Stzes Add $3 00 Per Sptnner PROP NUT ADAPTORS V Size . 1/4-28 28/7mm .6x1Omm 7x1Omm 5/1624.. 8x1Omm 8x12Smm 3/824 Approx Weight 061 061 or 063 or 082 076 076 02 076 075 sz 117 oz 115 02 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 / *ALL PARTS PRE-CUT & PREPAINTED O4/ BUILD & FLY IN TWO HOURS PAPER AIRPLANES 433 NIHOA STREET KAHULUI HI 96732 USA CATALOG $750 Contains 1000s paper airplanes postage stamp size 6 foot wing span Gliders rubber powered Diecut youcut Largest known source paper airplanes world Cost catalog deducted 1st order over $2500 ASTOUNDINGt CataLog AIR aL4plane aboue $1050 ptua $250 pohaga Letters Editor Continued page 12 sick 60 40 did fine job Keep up Homer Show young kids Beno Echerd South Padre Island TX Safety/Preston Continued page 22 associated gasoline-filled fuel cans let ter did catch eye dated September 1986 came Ernest Razzano li censed A&E mechanic 50 years experi ence Ernies letter responded article previ ous Safety column concerning hazard hav ing fuel cans batteries close proximity sent photos flight box using did use automotive fuel pump dis pense gasoline However Ernie has battery powering fuel pump located separate flight box also houses electric starter phone jack battery box used make electrical connection would welcome letters opinions pro con use electric pumps dispens ing gasoline models particular besides Ernie Razzano using automotive fuel pumps purpose would care tell us about setup Before leaving subject fuel fires/explo sions Jim Baxter Spokane WA sent news paper clipping headline Arson Sus pected Hobby Shop Fire Jim highlighted segment clipping stated 30 50 gallons methanol-based model airplane fuel stored building did ex plode letter Jim commented Since store totally gutted suspect fuel en hanced intensity fire Im sure did reason mentioning newspaper ac count question whether fuel stored metal cans safer plastic jugs guess fuel hobby shop plastic jugs melted allowed fuel burn cans metal its guess may well have exploded Any comments safety metal versus plastic fuel storage containers will welcome responding advertisers mention read about ModelAvlatlon Prime Cut/Sarpolus Continued page 31 glass cowl must trimmed necessary clear engine cylinder Mount cowl using four nylon bolts fit holes tapped fuse lage sides Tap holes A-in plywood aluminum landing gear held place A-in nylon bolts tail surface foam cores also sheeted %2 balsa Cut sheeting apart along hinge lines trim back allow added balsa edging Join horizontal stabilizer halves reinforcing fiberglass cloth epoxy Glue stabilizer fuselage elevators controlled its own servo pushrod Glue vertical fin place rudder linkage via pushrod cables tail wheel steering linked rudder small springs Balsa blocks must shaped installed behind fu selage top pieces side fin recess surfaces accept A-in plywood pieces nylon horns mounted control surfaces ailerons elevators rudder horns retained self-tapping sheet metal screws Epoxy plywood mounts control surfaces recommend using larger 4-40 threaded rods devises linkages Fiberglass tube pushrods used elevator linkages use iAin plywood servo mounts fuse lage Using separate servos elevators its own pushrod allows pushrods perfectly straight Since pushrods cross over within fuselage elevator servos mounted % higher other keep two pushrods rubbing together made up aileron extension cables Y harness two aileron servos mounted wing 1200 mAh battery pack used wrapped foam rubber positioned re cess cut foam fuselage top block bat tery pack can located behind wing posi tion necessary balance Landing gear tail wheel assembly can opy sheet aluminum landing gear can cut %2 aluminum stock available use Morrissey Bravo landing gear Sig Manufac turing Co secured T&D Fiberglass wheel pants inserting two screws through alumi num gear plywood block epoxied inside wheel pants Alternatively Sig B&B Special ties stock mounts wheel collar type leaf-spring tail wheel assembly heavy-duty model CB Associates 16oz fuel tank used space available 138 Model Aviation Paper Flying Scale Model Airplane $700 Part No IT-iSO-B fl175-B fl200B T1-225-B T1-226-B 11-250-B 11-25 1-B 11-275-B 11276-B 11300-B 11301-B 11-325-B 11-350-B 11375-8 TT-400-B Sire .. 1112 .. 13/4 .. 21/4 .. 21/4 FAt .. 21/2 2-1/2FAI . 2314 2314 FAt FAI .. 31/4 3112 . 3-314 . 4 Part No 11140-A TI 147A TT6 10-A TT-7 10-A TI- 516-A IT- 518-A TT-8 10-A 11-825-A IT- 375-A IT- 125-A Retail Price $495 495 495 495 495 495 495 495 595 595 another 16-oz tank smoke system de sired order keep ignition cutoff switch front firewall mounted sheet metal right angle bracket switch han dle protrudes slightly through slot cut fi bergiass cowl receiver antenna pushed nylon tube glued inside fuselage run ning back toward tail Finding large enough plastic bubble canopy aircraft like isnt easy T&D Fiber glass Specialties about source know large canopies might also try kit man ufacturers include large aircraft lines since will usually sell canopies sep arately shape canopy greatly influenc es general appearance type design its important find like Several canopies sold T&D Fiber glass suitable Note version shown plans differs used proto type photos canopy plans basically military style ver sion photos appropriate lightplane home-built aircraft Contact T&D de tails preference tint canopy shows up well use black Tintex dye warm water prevent distorting canopy shape few hours dye bath necessary achieve desired tint Use container large enough fully immerse canopy uniform result black plastic molding used lower edge provides finished appearance canopy attached four screws ply wood tabs glued fuselage top roll bar structure -in doweling quarter-scale-size pilot figure cockpit cut out add realism Propeller muffler cut hole through cowl permit choking carburetor other hole access carb needle valves B&B muffler fitted Quadra Lets face though B&B nearly other nominal muffler available Quadra does little actual muffling solution coupling $295 lawn mower muffler exhaust outlets using homemade adapter quieted things down considerably mower muffler neither too big nor excessively heavy its practical use two dual exhausts added mufflers mounted externally fuselage bottom positioned below landing gear course dont want hang con traptions nice clean aircraftbut theyll job until somebody makes true muffler larger engines reasonably muffled engines much noise comes propel ler As efforts other club members have shown noise level definitely affected shape prop tips Rounded pointed tips produce less noise Ive heard lot gas engine fliers engines produce lower-pitch noise eliminating need addi tional muffling achieving realistic sound general public noise noise Lets keep em quiet used 3/2-in P-SI plastic spinner CB Though looks quite attractive find myself picturing Tru-Turn machined aluminum spinner would look instead now com pany offering larger sizes polished aluminum unit would costly would certainly add pro pizzazz thats hard re sist Covering finishing Plastic film covering accepted norm todays modelers film easier faster apply contrib utes vast weight saving Its quite since put painted finish sport aircraft really dont miss fun doing good paint job used Coverites Black Baron film Prime Cut material new quarter-scale plane built-up structure Per magloss Super Coverite would contribute added strength totally sheeted foamcored model like Prime Cut knew plastic film would work fine Black Baron film requires lower heat set ting application Id previously used 20-year-old-plus heat sealing iron couldnt turned down low enough bought Coverite Black Baron iron pocket thermometers exact monitoring temperature Blackstone coating iron makes nice slippery Its lot easier use old iron lacked coating Using Coverite thermometer found setting around 225 0F worked best allover application film chose basic red-andwhite covering scheme overlapped film about /2 seams Black Baron easy apply showing little tendency bubble soft cloth used rub down bubbles assure total adhesion trimmed white areas blue stripe cut metal straightedge razor blade Black Baron film Positioning care fully ironed stripe place no trouble ironing stretching Black Baron ma terial particularly easy apply around com pound curves such tips tail surfaces Planning use red blue stars trim em phasis picked up some Coverite Graphics Trim Sheets purpose trim sheet material press-on adhesive backed simply pressed place after being cut desired shape Continued page 142 September 1989 139 SPECIALISTS IN CUSTOM COX TEE DEE & REED ENGINES O2OS 0495 051S074S& 09S ALL CUS TOM & STOCK PARTS VAILABLE INDIVIDUALLY COMPETITION ACCESSORIES & CUSTOMIZED K&B ENGINES RACING WHEELS KLOTZ OIL CARBON FIBER SOLID LINES ALL KINDS OF FUEL TUBING FOUR BRANDS OFGLOWPLUGS HA RD-TO-FIND HARD WARE OLD TIMER SUPPLIES COILS CONDENSERS NGK & STIlT SPARK PLUGS SILK 12 COLORS QUALITY DOPE BRUSHES 5& 7LOOP 1/4RUBBER BANDS TRANSISTOR IGNITION SYSTEMS RESISTOR HIGH TENSION LEADS 1/2A TEXACO PLA YBOY SR KIT 1/2A TEXACO ENGINES & PARTS KSB & IGNITION TIMERS RUBBER POWER KITS PROPS TISSUE AND OTHER SUPPLIES CYANOACRYLA TES & EPOXIES ORDER BY MAIL OR PHONE 019 729-4395 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING & HANDLING FEE $200 FOR INSURANCE ADD $100 STOCK ORDERS SHIPPED WITHIN 24 HRS Idle-Bar Glow Plugs Long Shortoniy $1 89 Also. Traditional line non-idle bar Glow Plugs Six Types 3 Heat Ranges High Performance Glow Element Blow Proof Seal Only $149 Swanson Associates PO Box 151 Wayne NJ nce 784a 07470 r PO Box 16621 Dept M Irvine CA 92714 714 250-1107 h. Prime Cut/Sarpolus Continued page 139 However found easier way Coverite offers die-cut sheet stars package containing 62 stars four sizes purchased pack red blue stars lifted off put air plane really easy trimming job Im sold Black Baron film Coverite also offers Black Baron epoxy paint colors match film its available spray cans would good choice fi berglass cowl wheel pants Flying Prime Cut solid stable flier thats nice responsive want wring out youre used flying larger air craft youll need literally adjust sights model appears same size sky smaller would youre flying too far out made lot faraway landings bigger models until learned gauge distance accurately bring closer Large aircraft quite stable landing ap proaches dont bounce around Bleed off speed bring model set plane down gently Aerobatics fun Prime Cut maneuvers require certain amount thought piloting skill cant horse around airplane would Ugly Stik smoke system definitely adds special air show appearance Treat big ones plenty respect thoughan 18-in prop big piece lumber can real damage Always have helper hanging behind aircraft start engine run up Safe flying watchword Radio Technique/Myers Continued page 33 Advanced Unlimited contestant except Basic category con structs figures FAT-CAT elements Free Program Thus figure commonly called Immelmann consists half-loop up ward entered upright level flight 721 K lf-roll exit upright level flight 9l32K4foratotalK l0Thedecimal numbers parentheses FAI-CAT numbers locate particular elements catalog corresponding K-factors Figures judged IAC competition elements no limit number elements can combined create figure long can keep within TACs Acrobatic Zone measures 3300 ft square 3500 ft above ground level AGL top zone 3280 ft AGL Unlimited cate gory bottom zone 1500 ft AGL Basic Sportsman 1200 ft AGL Intermediate 800 ft AGL Ad vanced 328 ft AGL Unlimited An TAC sequence list figures per formed sequentially during trip through Aerobatic Zone has sum K-factors appro priate category being flown order someone ground able judge well flier performs Free Pro gram flier must write paper performed IAC provides forms B C purpose Some judge must check competitors Free Program Forms B C before event involves lot work FAI-CAT adding machinefor both judge competitor Thats reason judges have familiar FAI-CAT TAC categories must fly Known Compul sory sequences made up cat egory published yearly IAC diffi culty flying Known Compulsory sequence increases Basic Unlimited first flight event competitor Known Compulsory also qualifying flight majority judges votes competi tor has demonstrated ability safely control aircraft disqualified category AMA could likewise Let digress Model Aviations Compe tition Newsletter section June 1989 issue pages 139-140 moment will find description IMAC International Miniature Aerobatics Club its compulsory sequences 1989 Aresti diagrams given names figures K factors can see what am discussing has used RC model world since 1974 Its new havent heard about before Now back airplanes can sit IAC has no compulsory advancements category competitors category pilot flies some what dependent airplane because air planes too weak structurally lack suffi cient power perform Advanced Unlimited category figures Intermediate Advanced Unlimited catego ries must also fly Unknown Compulsory Pro gram Unknown Compulsory constructed IAC headquarters supplied contest organizers particular contest Now come peculiarity Only pilots Unlimited category allowed perform Graded Unlimited Four-Minute Free Program program judged Originality K ersatility K armony & Rhythm K xecution K so done OUR REV-UP INVENTORY VERA GES OVER 9000 PROPS ii IMMEDIATE SHIPMENT ON VISAIMC CARBON FIBER LAMINATES Aerospace Composite Products offers variety rigid carbon fiber/epoxy sheets add stiffness almost material- fiberglass foam bal sawood laminates can used reinforce foam wings leading trailing edges wing spars Carbon Fiber bonds easily slow setting cyanoacrylates 5-minute epoxies laminate can stripped narrower widths CL-i 007 thick 1x48-$500 1x72-$700 CL-2 014 thick 1x48-$800 1x72-$1100 Send SASE information additional sizes products Add S300 shipping handling Calif residents add 6% tax Overseas orders add 15%-Order COD send check money order w r41 1nh1z VIIIIIII 1It5iIIIII51I source lightweight materials
Edition: Model Aviation - 1989/09
Page Numbers: 24, 25, 26, 27, 28, 29, 30, 31, 138, 139, 142
NO OCR TEXT NO OCR TEXT replicating particular design Original ity its strong suit Derived primarily Pik- 15 dash two other successful forerunners like Cap Laser Chipmunk RV-3 Akro its emi nently practical sport aircraft melds proven aerodynamic parameters very easy construction techniques Though its pace slower Pattern aircraft Prime Cut capable almost L access hatch cover wing bottom surface aileron control rod aileron controlled its own servo aerobatic maneuver Its steady re liable airplane takeoffs easy model can slowed down sufficiently achieve reasonably relaxed landings ever Prime Cut hardly trainer airplane big wing loading high pilot has really pay atten tion Id suggest model first step quarter-scale arena Its nice engine shots show complete access fiberglass cowl removed left close-up upside-down-mounted Quadra 40 engine 18-in prop 3-in CB plastic spinner ignition on-off switch mounted firewall handle protruding slightly through cowl photo right shows simple foam-and-tube structure fuselage exhaust system consist ing B&B muffler coupled lawn mower muffler reduce noise adapter consists two copper plumbing elbows brass tubing 26 Model Aviation view shows sleek lines big tail-dragger its tapered wing planform fully symmetrical airfoil covering Coverite Black Baron film Coverite graphics L Close-up canopy showing Wil liams Brothers -scale pilot complete dark glasses roll bar adding nice touch realism model canopy commercially available T&D Fiber glass Specialties Tinting black Tintex * view top center section wing shows 1/4-In plywood wing mounting key tongue used lieu common dowel arrangement author finds system easier install easier adjust good fit aileron servo lead seen extend ing wing Name address label wing suits AMA identification requirement ick Sarpolus N COWL PVY* DOW I. STRUCTURE3/3z BALSA &HEET OiE TECTFOAM CORE A &HEEI.j .- .___ -I 51- -- PLYL8HEET N - BALSA WING $1DDLE SQ BALSA BALSA BJOCJ / ALUMgPL 3/5 PL DOUBLiR SIG BRA&FOAM CORE LANDING CD GFAR CD 3/5BfL8ALE N 0 Co TI P& size airplanes apparent photo author left his friend Lou McGuire right showing off respective models Lous plane also powered Quadra 40 distinguished its Chipmunk-like trim scheme different canopy Lous airplane finished several months before authors benefited Lous flying experience Modifications incorporated landing gear based what Lou learned bottom shot wing off shows interior arrangement Four servos mounted side by-side across fuselage Two servos elevator control surface giving redundancy control power other two throttle rudder control Note use two lawn mower mufflers coupled B&B muffler attempt quiet large engine lack effective mufflers market large engines real problem change 40 60 size shipa bit challenge makes fun Construction sufficiently straightfor ward capable modelers will have no problems building supplies readily available fiberglass cowling wheel pants well plastic canopy available T&D Fiberglass alumi num landing gear Bravo unit Sig Manufacturing Co other hardware commercially available dont have local foam cutter foam cores can pur chased Robins Wing Balsa ply wood available locally through mail order suppliers surmise overall cost comparable less com mercial kit aircraft size friend Lou McGuire began work Prime Cut same time did Lou finished flying several months before Lous experience aircraft led us beef up landing gear mounting additional strength As shown plans has worked out well came time test fly Prime Cut knew little worry about Nevertheless took usual bundle photographs model before first flight though cant remember ever losing plane its debut always take RE/IFORCE FIRI FIBERGLASS COWL/ WITH FIBERBLM AIID EPOKY IIII III I III 11111 Ill' 'Ii IIII k4 TRIANGLEip TRIANGLE STOCKSTOCK FIBERBLASS COWL P1K-IS WHEEL PANTS NO IN AND PLASTIC CANOPY AVAILABLE FROM r o FIBERGLASS 30355 BLOCK GARDEN CITY NI 4B135 S I/B SPINNERS/SI BALSA TOP SECTID cI 91FUEL TANK Ic~I r~I ~II 41 IIi 4 - ~II I/BPLYBALSA QUADRA 55 OR 40ATTACi RECOMMENDEDWING 1/4 PLYWOOD LANDING BEAR MOUNTS FIBERGLASS WHEEL PANTS 4 I/I WHEELS photo record precautionary measure first flight uneventfuluntil midair After takeoff making few ele vator trim adjustments Lou executed some rolls loops snap rolls began making low passes photogra pher concentration must have tal because didnt notice other plane until too late heard crash watched helplessly pieces airplane flut tered through sky Interestingly other midair occurred less 30 minutes later plane surviving Prime Cut withstood impact well could expected Though radio engine survived wing tail surfaces could reused fuselage destroyed Im process construct ing new fuselage hope airborne again before long Still its just well took preflight photos Construction Prime Cuts structure follows conventional foam core design youre ready scratch-built project size youve probably already developed own preferred building techniques 28 Model Aviation Full-Size Plans Available. See Page 180 I/4 BALSA I4BALSA 3/G BALSA TOP FUSELAGE SHEETING NOT SHOWN IG PLYWOOD FUSELAGE STIFFENERIN THIS VIEW FOR CLARITYJ55 BALSA/ FIN/RLDGR TWO ELEVATON SERVOS WITH/K SEPARATE LINKAGE TO EACH ELEVATOR RECOMMENDED SQUAREI4BALSA RECEIVER SERVOS I /iI __-__ ii- _ I* IG BALSA IIG PLY DOUBLERIG BALSADOUBLERI/B PLYCB ASSOCIATES FUSELAGE SIDESTAIL WHEEL FUSELAGE SECTIONL4- SOTO HEREAND BOTTOMIM BALSAASSEMBLY ATTACHED TO WINGNYLON BOLTSTRIABBLE STOCK IB BALSA WING SADDLE PIECESMODEL AVIATION MAGAZINE PRIME CUT 10/N THE ACADEN OF MODEL AERONAUTICS FLY SAFELY AID QUIETLY O I5 5 4 B 67 BB ID II IS SPORTAEROBATIC AIRCRAFT FOR LARGER ENGINES DESIGNED AND DRAWN BY DICK SARPOLUS SHEET OF B cant find local source foam core cutting recommend Aerosmith Model Aviation RD #1 Box 290 Athens NY 12015 foam cores sheeted Y32 dium-weight balsa edge glued necessary needed width Ive used t2v Browns Southern Sorghum contact finished model wings shown supported simple foam block/cardboard tube assembly under landing gear keep weight off wheels airplane left standing prevents flat spots wheels canopy cowling wheel pants commercially available T&D Fiberglass Specialties landing gear can made up %2-in aluminum stock purchase Morrisey Bravo unit Sig Manufacturing Co cement years complete suc cess builders prefer using epoxy glue thinly applied 3M No 77 spray contact cement adhere skins September 1989 29 JJTK/F ii 11 1f4 PLYWOOD WING BOLT PLATE 00 Closeup bottom tuui nuwung CB Associates heavyduty leaf spring tail wheel assembly steering linkage tached rudder pushrod elevator pushrods Theres separate pushrod elevator devises pushrod ends heavyduty 440 size jam nuts keepers elevator devises /4 PLY WING NOUAT KEY WRAP CENTER SECT/ON Ii U9PLYWOOO A/ES I/4 PLYWOOD WINE MOUNT KEY \3/4 DOWEL TRIM FLUSN NTR NINE SWFACE DEPORE P/AERGLASS/NG I/A PLY 5 V5 PLY P/RE WALL 1/4 PLYWOOD 0 / S S S, cores Wing plywood wing mounting tongue substituted commonly used dowels wing positioning reinforced installing plywood rib root wing cores prefer mounting tongue dowels since contact area fuselage bulkhead retaining wing mount can trimmed shimmed necessary get correct wing-to-fuselage fit wing core sheeted top bottom trim off leading edge block Left shot catches aircraft climbs out its first takeoff Right its aerobatic capability undisputable dramatic photo Un fortunately lust moments later suffered midair collision extensively damaged fuselage completely replaced Prime Cut can mounted twin floats off-water flying fun foam core floats 48 x 6 have additional sheet aiuminum support strut bolted fuselage hind wing water rudder aft end float coupled aircraft rudder preparing lakeolT i ne auinor seems listening last-minute instructions Lou McGulre another member Jersey Coast Sportfliers Club just prior takeoff run tail wheel off ground Prime Cut just point smoothly lifting off Full-Size Plans Available. Page 180 SECT/ON Ar ROLASS CLOTH AND EPOXYLAYER OVER CENTER JO/NT J/N BALSA LEAD/NB EDGE SHEET WINO WITH -3/iS BALSA /NSTALL AILERON SERVOS IN WINO _____ WITH ACCESS RATCH ON BOTTOM SURFACE HOLE THROUGH FOAM CORE FOR SERVO EXTENSION CABLE ET COMPLETE WING W CUT AILERONS FREE FIN/SN EDGES I/B BALSA I\ Il 5/SB BALSA SHEETING CENTER LIRE I/U BALSA BULKHEADS ~ii 1/4 BALSA AILERON CROSS SECT/ON FOAM STABILIZER TEMPLATES USE HEAVY DI/TY N/RUES FOAM FIN/RWDER TEMPLATES 5/55 TEMPERED ALUM/MUM LARDING GEAR OR USE BIG MFG COS BRAVO LARDING GEAR hz FOAM WING CONE TEMPLATES BLOCK 11 I BALSA TIPS FOAM CORE FUSELAGE TOP BLOCK TEMPLATES 1/4 BALSA EDGES II J U I II PR/ME CUT SHEET S OF * sand square Add oversized leading edge strip plane sand shape wing tips sanded angle sheeted balsa easier sand ing tip blocks shape also produces lighter results Cut ailerons sheeted wing trim down allow balsa edges sand shape Hinge ailerons along centerline using large sturdy freely moving hingesand plenty Cut recesses lower wing surface aileron servo mounting installation aileron servo exten sion cables heat end piece A-in steel rod push through foam core root aileron servo location Removable hatches can stalled over servo areas Butt glue two wing halves wrap center joint wing heavy fiberglass cloth epoxy Use double layers cloth center Fuselage Select firm-to-hard balsa fuselage sides edge gluing splicing necessary achieve size required Glue /16 plywood doublers A-in plywood landing gear block reinforcements balsa wing saddle pieces stab saddle doublers balsa corner strips two fuselage sides before adding bulkheads Glue %-in plywood firewall next three bulkheads sides ing certain install perpendicular angle Glue second side three bulkheads sides parallel firewall wing trailing edge position Note A-in triangle stock used sides front plywood firewall -in triangle stock behind firewall Add A-in plywood wing bolt plate cockpit floor/fuselage reinforce ment piece Pull tail end together stall four rear bulkheads As certain fuselage sides taper straight line bulkhead beside wing trailing edge tail ensuring straight-cut foam top block will fit cor rectly Sheet foam fuselage top pieces /32 balsa Trim sheeting necessary glue place atop basic fuselage structure Reinforce firewall installation heavy fiberglass cloth epoxy ap plied over triangle stock behind fire wall also install several A-in-long No 4 screws through sides firewall extra security against vibration large gas engine can produce Large 8-32 blind nuts tee nuts installed firewall engine mounting bolts Add plywood landing gear mount forward bottom section fuselage Before adding fuselage bottom sheeting cut holes rear bulkheads eleva tor rudder pushrods usually wait until tail surfaces installed wing fitted fuselage before adding fuse lage bottom planlting Engine mount tail surfaces elevator stabilizer fin rudders fiberContinued page 138 September 1989 31 PRECISION MODEL PRODUCTS /ZIIflJ Made USA j7BARSTOCK ALUMINUM SPINNERS RetailAppros PriceWeight $1395058 oz 1495095oz 159510002 1695160oz 1895150oz 1895190oz 2095170or 2295220oz 2495200oz 2695260oz 2895250oz 3695340oz 4995470or 5995520oz 6995570or 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available tn Stzes Add $3 00 Per Sptnner PROP NUT ADAPTORS V Size . 1/4-28 28/7mm .6x1Omm 7x1Omm 5/1624.. 8x1Omm 8x12Smm 3/824 Approx Weight 061 061 or 063 or 082 076 076 02 076 075 sz 117 oz 115 02 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 / *ALL PARTS PRE-CUT & PREPAINTED O4/ BUILD & FLY IN TWO HOURS PAPER AIRPLANES 433 NIHOA STREET KAHULUI HI 96732 USA CATALOG $750 Contains 1000s paper airplanes postage stamp size 6 foot wing span Gliders rubber powered Diecut youcut Largest known source paper airplanes world Cost catalog deducted 1st order over $2500 ASTOUNDINGt CataLog AIR aL4plane aboue $1050 ptua $250 pohaga Letters Editor Continued page 12 sick 60 40 did fine job Keep up Homer Show young kids Beno Echerd South Padre Island TX Safety/Preston Continued page 22 associated gasoline-filled fuel cans let ter did catch eye dated September 1986 came Ernest Razzano li censed A&E mechanic 50 years experi ence Ernies letter responded article previ ous Safety column concerning hazard hav ing fuel cans batteries close proximity sent photos flight box using did use automotive fuel pump dis pense gasoline However Ernie has battery powering fuel pump located separate flight box also houses electric starter phone jack battery box used make electrical connection would welcome letters opinions pro con use electric pumps dispens ing gasoline models particular besides Ernie Razzano using automotive fuel pumps purpose would care tell us about setup Before leaving subject fuel fires/explo sions Jim Baxter Spokane WA sent news paper clipping headline Arson Sus pected Hobby Shop Fire Jim highlighted segment clipping stated 30 50 gallons methanol-based model airplane fuel stored building did ex plode letter Jim commented Since store totally gutted suspect fuel en hanced intensity fire Im sure did reason mentioning newspaper ac count question whether fuel stored metal cans safer plastic jugs guess fuel hobby shop plastic jugs melted allowed fuel burn cans metal its guess may well have exploded Any comments safety metal versus plastic fuel storage containers will welcome responding advertisers mention read about ModelAvlatlon Prime Cut/Sarpolus Continued page 31 glass cowl must trimmed necessary clear engine cylinder Mount cowl using four nylon bolts fit holes tapped fuse lage sides Tap holes A-in plywood aluminum landing gear held place A-in nylon bolts tail surface foam cores also sheeted %2 balsa Cut sheeting apart along hinge lines trim back allow added balsa edging Join horizontal stabilizer halves reinforcing fiberglass cloth epoxy Glue stabilizer fuselage elevators controlled its own servo pushrod Glue vertical fin place rudder linkage via pushrod cables tail wheel steering linked rudder small springs Balsa blocks must shaped installed behind fu selage top pieces side fin recess surfaces accept A-in plywood pieces nylon horns mounted control surfaces ailerons elevators rudder horns retained self-tapping sheet metal screws Epoxy plywood mounts control surfaces recommend using larger 4-40 threaded rods devises linkages Fiberglass tube pushrods used elevator linkages use iAin plywood servo mounts fuse lage Using separate servos elevators its own pushrod allows pushrods perfectly straight Since pushrods cross over within fuselage elevator servos mounted % higher other keep two pushrods rubbing together made up aileron extension cables Y harness two aileron servos mounted wing 1200 mAh battery pack used wrapped foam rubber positioned re cess cut foam fuselage top block bat tery pack can located behind wing posi tion necessary balance Landing gear tail wheel assembly can opy sheet aluminum landing gear can cut %2 aluminum stock available use Morrissey Bravo landing gear Sig Manufac turing Co secured T&D Fiberglass wheel pants inserting two screws through alumi num gear plywood block epoxied inside wheel pants Alternatively Sig B&B Special ties stock mounts wheel collar type leaf-spring tail wheel assembly heavy-duty model CB Associates 16oz fuel tank used space available 138 Model Aviation Paper Flying Scale Model Airplane $700 Part No IT-iSO-B fl175-B fl200B T1-225-B T1-226-B 11-250-B 11-25 1-B 11-275-B 11276-B 11300-B 11301-B 11-325-B 11-350-B 11375-8 TT-400-B Sire .. 1112 .. 13/4 .. 21/4 .. 21/4 FAt .. 21/2 2-1/2FAI . 2314 2314 FAt FAI .. 31/4 3112 . 3-314 . 4 Part No 11140-A TI 147A TT6 10-A TT-7 10-A TI- 516-A IT- 518-A TT-8 10-A 11-825-A IT- 375-A IT- 125-A Retail Price $495 495 495 495 495 495 495 495 595 595 another 16-oz tank smoke system de sired order keep ignition cutoff switch front firewall mounted sheet metal right angle bracket switch han dle protrudes slightly through slot cut fi bergiass cowl receiver antenna pushed nylon tube glued inside fuselage run ning back toward tail Finding large enough plastic bubble canopy aircraft like isnt easy T&D Fiber glass Specialties about source know large canopies might also try kit man ufacturers include large aircraft lines since will usually sell canopies sep arately shape canopy greatly influenc es general appearance type design its important find like Several canopies sold T&D Fiber glass suitable Note version shown plans differs used proto type photos canopy plans basically military style ver sion photos appropriate lightplane home-built aircraft Contact T&D de tails preference tint canopy shows up well use black Tintex dye warm water prevent distorting canopy shape few hours dye bath necessary achieve desired tint Use container large enough fully immerse canopy uniform result black plastic molding used lower edge provides finished appearance canopy attached four screws ply wood tabs glued fuselage top roll bar structure -in doweling quarter-scale-size pilot figure cockpit cut out add realism Propeller muffler cut hole through cowl permit choking carburetor other hole access carb needle valves B&B muffler fitted Quadra Lets face though B&B nearly other nominal muffler available Quadra does little actual muffling solution coupling $295 lawn mower muffler exhaust outlets using homemade adapter quieted things down considerably mower muffler neither too big nor excessively heavy its practical use two dual exhausts added mufflers mounted externally fuselage bottom positioned below landing gear course dont want hang con traptions nice clean aircraftbut theyll job until somebody makes true muffler larger engines reasonably muffled engines much noise comes propel ler As efforts other club members have shown noise level definitely affected shape prop tips Rounded pointed tips produce less noise Ive heard lot gas engine fliers engines produce lower-pitch noise eliminating need addi tional muffling achieving realistic sound general public noise noise Lets keep em quiet used 3/2-in P-SI plastic spinner CB Though looks quite attractive find myself picturing Tru-Turn machined aluminum spinner would look instead now com pany offering larger sizes polished aluminum unit would costly would certainly add pro pizzazz thats hard re sist Covering finishing Plastic film covering accepted norm todays modelers film easier faster apply contrib utes vast weight saving Its quite since put painted finish sport aircraft really dont miss fun doing good paint job used Coverites Black Baron film Prime Cut material new quarter-scale plane built-up structure Per magloss Super Coverite would contribute added strength totally sheeted foamcored model like Prime Cut knew plastic film would work fine Black Baron film requires lower heat set ting application Id previously used 20-year-old-plus heat sealing iron couldnt turned down low enough bought Coverite Black Baron iron pocket thermometers exact monitoring temperature Blackstone coating iron makes nice slippery Its lot easier use old iron lacked coating Using Coverite thermometer found setting around 225 0F worked best allover application film chose basic red-andwhite covering scheme overlapped film about /2 seams Black Baron easy apply showing little tendency bubble soft cloth used rub down bubbles assure total adhesion trimmed white areas blue stripe cut metal straightedge razor blade Black Baron film Positioning care fully ironed stripe place no trouble ironing stretching Black Baron ma terial particularly easy apply around com pound curves such tips tail surfaces Planning use red blue stars trim em phasis picked up some Coverite Graphics Trim Sheets purpose trim sheet material press-on adhesive backed simply pressed place after being cut desired shape Continued page 142 September 1989 139 SPECIALISTS IN CUSTOM COX TEE DEE & REED ENGINES O2OS 0495 051S074S& 09S ALL CUS TOM & STOCK PARTS VAILABLE INDIVIDUALLY COMPETITION ACCESSORIES & CUSTOMIZED K&B ENGINES RACING WHEELS KLOTZ OIL CARBON FIBER SOLID LINES ALL KINDS OF FUEL TUBING FOUR BRANDS OFGLOWPLUGS HA RD-TO-FIND HARD WARE OLD TIMER SUPPLIES COILS CONDENSERS NGK & STIlT SPARK PLUGS SILK 12 COLORS QUALITY DOPE BRUSHES 5& 7LOOP 1/4RUBBER BANDS TRANSISTOR IGNITION SYSTEMS RESISTOR HIGH TENSION LEADS 1/2A TEXACO PLA YBOY SR KIT 1/2A TEXACO ENGINES & PARTS KSB & IGNITION TIMERS RUBBER POWER KITS PROPS TISSUE AND OTHER SUPPLIES CYANOACRYLA TES & EPOXIES ORDER BY MAIL OR PHONE 019 729-4395 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING & HANDLING FEE $200 FOR INSURANCE ADD $100 STOCK ORDERS SHIPPED WITHIN 24 HRS Idle-Bar Glow Plugs Long Shortoniy $1 89 Also. Traditional line non-idle bar Glow Plugs Six Types 3 Heat Ranges High Performance Glow Element Blow Proof Seal Only $149 Swanson Associates PO Box 151 Wayne NJ nce 784a 07470 r PO Box 16621 Dept M Irvine CA 92714 714 250-1107 h. Prime Cut/Sarpolus Continued page 139 However found easier way Coverite offers die-cut sheet stars package containing 62 stars four sizes purchased pack red blue stars lifted off put air plane really easy trimming job Im sold Black Baron film Coverite also offers Black Baron epoxy paint colors match film its available spray cans would good choice fi berglass cowl wheel pants Flying Prime Cut solid stable flier thats nice responsive want wring out youre used flying larger air craft youll need literally adjust sights model appears same size sky smaller would youre flying too far out made lot faraway landings bigger models until learned gauge distance accurately bring closer Large aircraft quite stable landing ap proaches dont bounce around Bleed off speed bring model set plane down gently Aerobatics fun Prime Cut maneuvers require certain amount thought piloting skill cant horse around airplane would Ugly Stik smoke system definitely adds special air show appearance Treat big ones plenty respect thoughan 18-in prop big piece lumber can real damage Always have helper hanging behind aircraft start engine run up Safe flying watchword Radio Technique/Myers Continued page 33 Advanced Unlimited contestant except Basic category con structs figures FAT-CAT elements Free Program Thus figure commonly called Immelmann consists half-loop up ward entered upright level flight 721 K lf-roll exit upright level flight 9l32K4foratotalK l0Thedecimal numbers parentheses FAI-CAT numbers locate particular elements catalog corresponding K-factors Figures judged IAC competition elements no limit number elements can combined create figure long can keep within TACs Acrobatic Zone measures 3300 ft square 3500 ft above ground level AGL top zone 3280 ft AGL Unlimited cate gory bottom zone 1500 ft AGL Basic Sportsman 1200 ft AGL Intermediate 800 ft AGL Ad vanced 328 ft AGL Unlimited An TAC sequence list figures per formed sequentially during trip through Aerobatic Zone has sum K-factors appro priate category being flown order someone ground able judge well flier performs Free Pro gram flier must write paper performed IAC provides forms B C purpose Some judge must check competitors Free Program Forms B C before event involves lot work FAI-CAT adding machinefor both judge competitor Thats reason judges have familiar FAI-CAT TAC categories must fly Known Compul sory sequences made up cat egory published yearly IAC diffi culty flying Known Compulsory sequence increases Basic Unlimited first flight event competitor Known Compulsory also qualifying flight majority judges votes competi tor has demonstrated ability safely control aircraft disqualified category AMA could likewise Let digress Model Aviations Compe tition Newsletter section June 1989 issue pages 139-140 moment will find description IMAC International Miniature Aerobatics Club its compulsory sequences 1989 Aresti diagrams given names figures K factors can see what am discussing has used RC model world since 1974 Its new havent heard about before Now back airplanes can sit IAC has no compulsory advancements category competitors category pilot flies some what dependent airplane because air planes too weak structurally lack suffi cient power perform Advanced Unlimited category figures Intermediate Advanced Unlimited catego ries must also fly Unknown Compulsory Pro gram Unknown Compulsory constructed IAC headquarters supplied contest organizers particular contest Now come peculiarity Only pilots Unlimited category allowed perform Graded Unlimited Four-Minute Free Program program judged Originality K ersatility K armony & Rhythm K xecution K so done OUR REV-UP INVENTORY VERA GES OVER 9000 PROPS ii IMMEDIATE SHIPMENT ON VISAIMC CARBON FIBER LAMINATES Aerospace Composite Products offers variety rigid carbon fiber/epoxy sheets add stiffness almost material- fiberglass foam bal sawood laminates can used reinforce foam wings leading trailing edges wing spars Carbon Fiber bonds easily slow setting cyanoacrylates 5-minute epoxies laminate can stripped narrower widths CL-i 007 thick 1x48-$500 1x72-$700 CL-2 014 thick 1x48-$800 1x72-$1100 Send SASE information additional sizes products Add S300 shipping handling Calif residents add 6% tax Overseas orders add 15%-Order COD send check money order w r41 1nh1z VIIIIIII 1It5iIIIII51I source lightweight materials
Edition: Model Aviation - 1989/09
Page Numbers: 24, 25, 26, 27, 28, 29, 30, 31, 138, 139, 142
NO OCR TEXT NO OCR TEXT replicating particular design Original ity its strong suit Derived primarily Pik- 15 dash two other successful forerunners like Cap Laser Chipmunk RV-3 Akro its emi nently practical sport aircraft melds proven aerodynamic parameters very easy construction techniques Though its pace slower Pattern aircraft Prime Cut capable almost L access hatch cover wing bottom surface aileron control rod aileron controlled its own servo aerobatic maneuver Its steady re liable airplane takeoffs easy model can slowed down sufficiently achieve reasonably relaxed landings ever Prime Cut hardly trainer airplane big wing loading high pilot has really pay atten tion Id suggest model first step quarter-scale arena Its nice engine shots show complete access fiberglass cowl removed left close-up upside-down-mounted Quadra 40 engine 18-in prop 3-in CB plastic spinner ignition on-off switch mounted firewall handle protruding slightly through cowl photo right shows simple foam-and-tube structure fuselage exhaust system consist ing B&B muffler coupled lawn mower muffler reduce noise adapter consists two copper plumbing elbows brass tubing 26 Model Aviation view shows sleek lines big tail-dragger its tapered wing planform fully symmetrical airfoil covering Coverite Black Baron film Coverite graphics L Close-up canopy showing Wil liams Brothers -scale pilot complete dark glasses roll bar adding nice touch realism model canopy commercially available T&D Fiber glass Specialties Tinting black Tintex * view top center section wing shows 1/4-In plywood wing mounting key tongue used lieu common dowel arrangement author finds system easier install easier adjust good fit aileron servo lead seen extend ing wing Name address label wing suits AMA identification requirement ick Sarpolus N COWL PVY* DOW I. STRUCTURE3/3z BALSA &HEET OiE TECTFOAM CORE A &HEEI.j .- .___ -I 51- -- PLYL8HEET N - BALSA WING $1DDLE SQ BALSA BALSA BJOCJ / ALUMgPL 3/5 PL DOUBLiR SIG BRA&FOAM CORE LANDING CD GFAR CD 3/5BfL8ALE N 0 Co TI P& size airplanes apparent photo author left his friend Lou McGuire right showing off respective models Lous plane also powered Quadra 40 distinguished its Chipmunk-like trim scheme different canopy Lous airplane finished several months before authors benefited Lous flying experience Modifications incorporated landing gear based what Lou learned bottom shot wing off shows interior arrangement Four servos mounted side by-side across fuselage Two servos elevator control surface giving redundancy control power other two throttle rudder control Note use two lawn mower mufflers coupled B&B muffler attempt quiet large engine lack effective mufflers market large engines real problem change 40 60 size shipa bit challenge makes fun Construction sufficiently straightfor ward capable modelers will have no problems building supplies readily available fiberglass cowling wheel pants well plastic canopy available T&D Fiberglass alumi num landing gear Bravo unit Sig Manufacturing Co other hardware commercially available dont have local foam cutter foam cores can pur chased Robins Wing Balsa ply wood available locally through mail order suppliers surmise overall cost comparable less com mercial kit aircraft size friend Lou McGuire began work Prime Cut same time did Lou finished flying several months before Lous experience aircraft led us beef up landing gear mounting additional strength As shown plans has worked out well came time test fly Prime Cut knew little worry about Nevertheless took usual bundle photographs model before first flight though cant remember ever losing plane its debut always take RE/IFORCE FIRI FIBERGLASS COWL/ WITH FIBERBLM AIID EPOKY IIII III I III 11111 Ill' 'Ii IIII k4 TRIANGLEip TRIANGLE STOCKSTOCK FIBERBLASS COWL P1K-IS WHEEL PANTS NO IN AND PLASTIC CANOPY AVAILABLE FROM r o FIBERGLASS 30355 BLOCK GARDEN CITY NI 4B135 S I/B SPINNERS/SI BALSA TOP SECTID cI 91FUEL TANK Ic~I r~I ~II 41 IIi 4 - ~II I/BPLYBALSA QUADRA 55 OR 40ATTACi RECOMMENDEDWING 1/4 PLYWOOD LANDING BEAR MOUNTS FIBERGLASS WHEEL PANTS 4 I/I WHEELS photo record precautionary measure first flight uneventfuluntil midair After takeoff making few ele vator trim adjustments Lou executed some rolls loops snap rolls began making low passes photogra pher concentration must have tal because didnt notice other plane until too late heard crash watched helplessly pieces airplane flut tered through sky Interestingly other midair occurred less 30 minutes later plane surviving Prime Cut withstood impact well could expected Though radio engine survived wing tail surfaces could reused fuselage destroyed Im process construct ing new fuselage hope airborne again before long Still its just well took preflight photos Construction Prime Cuts structure follows conventional foam core design youre ready scratch-built project size youve probably already developed own preferred building techniques 28 Model Aviation Full-Size Plans Available. See Page 180 I/4 BALSA I4BALSA 3/G BALSA TOP FUSELAGE SHEETING NOT SHOWN IG PLYWOOD FUSELAGE STIFFENERIN THIS VIEW FOR CLARITYJ55 BALSA/ FIN/RLDGR TWO ELEVATON SERVOS WITH/K SEPARATE LINKAGE TO EACH ELEVATOR RECOMMENDED SQUAREI4BALSA RECEIVER SERVOS I /iI __-__ ii- _ I* IG BALSA IIG PLY DOUBLERIG BALSADOUBLERI/B PLYCB ASSOCIATES FUSELAGE SIDESTAIL WHEEL FUSELAGE SECTIONL4- SOTO HEREAND BOTTOMIM BALSAASSEMBLY ATTACHED TO WINGNYLON BOLTSTRIABBLE STOCK IB BALSA WING SADDLE PIECESMODEL AVIATION MAGAZINE PRIME CUT 10/N THE ACADEN OF MODEL AERONAUTICS FLY SAFELY AID QUIETLY O I5 5 4 B 67 BB ID II IS SPORTAEROBATIC AIRCRAFT FOR LARGER ENGINES DESIGNED AND DRAWN BY DICK SARPOLUS SHEET OF B cant find local source foam core cutting recommend Aerosmith Model Aviation RD #1 Box 290 Athens NY 12015 foam cores sheeted Y32 dium-weight balsa edge glued necessary needed width Ive used t2v Browns Southern Sorghum contact finished model wings shown supported simple foam block/cardboard tube assembly under landing gear keep weight off wheels airplane left standing prevents flat spots wheels canopy cowling wheel pants commercially available T&D Fiberglass Specialties landing gear can made up %2-in aluminum stock purchase Morrisey Bravo unit Sig Manufacturing Co cement years complete suc cess builders prefer using epoxy glue thinly applied 3M No 77 spray contact cement adhere skins September 1989 29 JJTK/F ii 11 1f4 PLYWOOD WING BOLT PLATE 00 Closeup bottom tuui nuwung CB Associates heavyduty leaf spring tail wheel assembly steering linkage tached rudder pushrod elevator pushrods Theres separate pushrod elevator devises pushrod ends heavyduty 440 size jam nuts keepers elevator devises /4 PLY WING NOUAT KEY WRAP CENTER SECT/ON Ii U9PLYWOOO A/ES I/4 PLYWOOD WINE MOUNT KEY \3/4 DOWEL TRIM FLUSN NTR NINE SWFACE DEPORE P/AERGLASS/NG I/A PLY 5 V5 PLY P/RE WALL 1/4 PLYWOOD 0 / S S S, cores Wing plywood wing mounting tongue substituted commonly used dowels wing positioning reinforced installing plywood rib root wing cores prefer mounting tongue dowels since contact area fuselage bulkhead retaining wing mount can trimmed shimmed necessary get correct wing-to-fuselage fit wing core sheeted top bottom trim off leading edge block Left shot catches aircraft climbs out its first takeoff Right its aerobatic capability undisputable dramatic photo Un fortunately lust moments later suffered midair collision extensively damaged fuselage completely replaced Prime Cut can mounted twin floats off-water flying fun foam core floats 48 x 6 have additional sheet aiuminum support strut bolted fuselage hind wing water rudder aft end float coupled aircraft rudder preparing lakeolT i ne auinor seems listening last-minute instructions Lou McGulre another member Jersey Coast Sportfliers Club just prior takeoff run tail wheel off ground Prime Cut just point smoothly lifting off Full-Size Plans Available. Page 180 SECT/ON Ar ROLASS CLOTH AND EPOXYLAYER OVER CENTER JO/NT J/N BALSA LEAD/NB EDGE SHEET WINO WITH -3/iS BALSA /NSTALL AILERON SERVOS IN WINO _____ WITH ACCESS RATCH ON BOTTOM SURFACE HOLE THROUGH FOAM CORE FOR SERVO EXTENSION CABLE ET COMPLETE WING W CUT AILERONS FREE FIN/SN EDGES I/B BALSA I\ Il 5/SB BALSA SHEETING CENTER LIRE I/U BALSA BULKHEADS ~ii 1/4 BALSA AILERON CROSS SECT/ON FOAM STABILIZER TEMPLATES USE HEAVY DI/TY N/RUES FOAM FIN/RWDER TEMPLATES 5/55 TEMPERED ALUM/MUM LARDING GEAR OR USE BIG MFG COS BRAVO LARDING GEAR hz FOAM WING CONE TEMPLATES BLOCK 11 I BALSA TIPS FOAM CORE FUSELAGE TOP BLOCK TEMPLATES 1/4 BALSA EDGES II J U I II PR/ME CUT SHEET S OF * sand square Add oversized leading edge strip plane sand shape wing tips sanded angle sheeted balsa easier sand ing tip blocks shape also produces lighter results Cut ailerons sheeted wing trim down allow balsa edges sand shape Hinge ailerons along centerline using large sturdy freely moving hingesand plenty Cut recesses lower wing surface aileron servo mounting installation aileron servo exten sion cables heat end piece A-in steel rod push through foam core root aileron servo location Removable hatches can stalled over servo areas Butt glue two wing halves wrap center joint wing heavy fiberglass cloth epoxy Use double layers cloth center Fuselage Select firm-to-hard balsa fuselage sides edge gluing splicing necessary achieve size required Glue /16 plywood doublers A-in plywood landing gear block reinforcements balsa wing saddle pieces stab saddle doublers balsa corner strips two fuselage sides before adding bulkheads Glue %-in plywood firewall next three bulkheads sides ing certain install perpendicular angle Glue second side three bulkheads sides parallel firewall wing trailing edge position Note A-in triangle stock used sides front plywood firewall -in triangle stock behind firewall Add A-in plywood wing bolt plate cockpit floor/fuselage reinforce ment piece Pull tail end together stall four rear bulkheads As certain fuselage sides taper straight line bulkhead beside wing trailing edge tail ensuring straight-cut foam top block will fit cor rectly Sheet foam fuselage top pieces /32 balsa Trim sheeting necessary glue place atop basic fuselage structure Reinforce firewall installation heavy fiberglass cloth epoxy ap plied over triangle stock behind fire wall also install several A-in-long No 4 screws through sides firewall extra security against vibration large gas engine can produce Large 8-32 blind nuts tee nuts installed firewall engine mounting bolts Add plywood landing gear mount forward bottom section fuselage Before adding fuselage bottom sheeting cut holes rear bulkheads eleva tor rudder pushrods usually wait until tail surfaces installed wing fitted fuselage before adding fuse lage bottom planlting Engine mount tail surfaces elevator stabilizer fin rudders fiberContinued page 138 September 1989 31 PRECISION MODEL PRODUCTS /ZIIflJ Made USA j7BARSTOCK ALUMINUM SPINNERS RetailAppros PriceWeight $1395058 oz 1495095oz 159510002 1695160oz 1895150oz 1895190oz 2095170or 2295220oz 2495200oz 2695260oz 2895250oz 3695340oz 4995470or 5995520oz 6995570or 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available tn Stzes Add $3 00 Per Sptnner PROP NUT ADAPTORS V Size . 1/4-28 28/7mm .6x1Omm 7x1Omm 5/1624.. 8x1Omm 8x12Smm 3/824 Approx Weight 061 061 or 063 or 082 076 076 02 076 075 sz 117 oz 115 02 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 / *ALL PARTS PRE-CUT & PREPAINTED O4/ BUILD & FLY IN TWO HOURS PAPER AIRPLANES 433 NIHOA STREET KAHULUI HI 96732 USA CATALOG $750 Contains 1000s paper airplanes postage stamp size 6 foot wing span Gliders rubber powered Diecut youcut Largest known source paper airplanes world Cost catalog deducted 1st order over $2500 ASTOUNDINGt CataLog AIR aL4plane aboue $1050 ptua $250 pohaga Letters Editor Continued page 12 sick 60 40 did fine job Keep up Homer Show young kids Beno Echerd South Padre Island TX Safety/Preston Continued page 22 associated gasoline-filled fuel cans let ter did catch eye dated September 1986 came Ernest Razzano li censed A&E mechanic 50 years experi ence Ernies letter responded article previ ous Safety column concerning hazard hav ing fuel cans batteries close proximity sent photos flight box using did use automotive fuel pump dis pense gasoline However Ernie has battery powering fuel pump located separate flight box also houses electric starter phone jack battery box used make electrical connection would welcome letters opinions pro con use electric pumps dispens ing gasoline models particular besides Ernie Razzano using automotive fuel pumps purpose would care tell us about setup Before leaving subject fuel fires/explo sions Jim Baxter Spokane WA sent news paper clipping headline Arson Sus pected Hobby Shop Fire Jim highlighted segment clipping stated 30 50 gallons methanol-based model airplane fuel stored building did ex plode letter Jim commented Since store totally gutted suspect fuel en hanced intensity fire Im sure did reason mentioning newspaper ac count question whether fuel stored metal cans safer plastic jugs guess fuel hobby shop plastic jugs melted allowed fuel burn cans metal its guess may well have exploded Any comments safety metal versus plastic fuel storage containers will welcome responding advertisers mention read about ModelAvlatlon Prime Cut/Sarpolus Continued page 31 glass cowl must trimmed necessary clear engine cylinder Mount cowl using four nylon bolts fit holes tapped fuse lage sides Tap holes A-in plywood aluminum landing gear held place A-in nylon bolts tail surface foam cores also sheeted %2 balsa Cut sheeting apart along hinge lines trim back allow added balsa edging Join horizontal stabilizer halves reinforcing fiberglass cloth epoxy Glue stabilizer fuselage elevators controlled its own servo pushrod Glue vertical fin place rudder linkage via pushrod cables tail wheel steering linked rudder small springs Balsa blocks must shaped installed behind fu selage top pieces side fin recess surfaces accept A-in plywood pieces nylon horns mounted control surfaces ailerons elevators rudder horns retained self-tapping sheet metal screws Epoxy plywood mounts control surfaces recommend using larger 4-40 threaded rods devises linkages Fiberglass tube pushrods used elevator linkages use iAin plywood servo mounts fuse lage Using separate servos elevators its own pushrod allows pushrods perfectly straight Since pushrods cross over within fuselage elevator servos mounted % higher other keep two pushrods rubbing together made up aileron extension cables Y harness two aileron servos mounted wing 1200 mAh battery pack used wrapped foam rubber positioned re cess cut foam fuselage top block bat tery pack can located behind wing posi tion necessary balance Landing gear tail wheel assembly can opy sheet aluminum landing gear can cut %2 aluminum stock available use Morrissey Bravo landing gear Sig Manufac turing Co secured T&D Fiberglass wheel pants inserting two screws through alumi num gear plywood block epoxied inside wheel pants Alternatively Sig B&B Special ties stock mounts wheel collar type leaf-spring tail wheel assembly heavy-duty model CB Associates 16oz fuel tank used space available 138 Model Aviation Paper Flying Scale Model Airplane $700 Part No IT-iSO-B fl175-B fl200B T1-225-B T1-226-B 11-250-B 11-25 1-B 11-275-B 11276-B 11300-B 11301-B 11-325-B 11-350-B 11375-8 TT-400-B Sire .. 1112 .. 13/4 .. 21/4 .. 21/4 FAt .. 21/2 2-1/2FAI . 2314 2314 FAt FAI .. 31/4 3112 . 3-314 . 4 Part No 11140-A TI 147A TT6 10-A TT-7 10-A TI- 516-A IT- 518-A TT-8 10-A 11-825-A IT- 375-A IT- 125-A Retail Price $495 495 495 495 495 495 495 495 595 595 another 16-oz tank smoke system de sired order keep ignition cutoff switch front firewall mounted sheet metal right angle bracket switch han dle protrudes slightly through slot cut fi bergiass cowl receiver antenna pushed nylon tube glued inside fuselage run ning back toward tail Finding large enough plastic bubble canopy aircraft like isnt easy T&D Fiber glass Specialties about source know large canopies might also try kit man ufacturers include large aircraft lines since will usually sell canopies sep arately shape canopy greatly influenc es general appearance type design its important find like Several canopies sold T&D Fiber glass suitable Note version shown plans differs used proto type photos canopy plans basically military style ver sion photos appropriate lightplane home-built aircraft Contact T&D de tails preference tint canopy shows up well use black Tintex dye warm water prevent distorting canopy shape few hours dye bath necessary achieve desired tint Use container large enough fully immerse canopy uniform result black plastic molding used lower edge provides finished appearance canopy attached four screws ply wood tabs glued fuselage top roll bar structure -in doweling quarter-scale-size pilot figure cockpit cut out add realism Propeller muffler cut hole through cowl permit choking carburetor other hole access carb needle valves B&B muffler fitted Quadra Lets face though B&B nearly other nominal muffler available Quadra does little actual muffling solution coupling $295 lawn mower muffler exhaust outlets using homemade adapter quieted things down considerably mower muffler neither too big nor excessively heavy its practical use two dual exhausts added mufflers mounted externally fuselage bottom positioned below landing gear course dont want hang con traptions nice clean aircraftbut theyll job until somebody makes true muffler larger engines reasonably muffled engines much noise comes propel ler As efforts other club members have shown noise level definitely affected shape prop tips Rounded pointed tips produce less noise Ive heard lot gas engine fliers engines produce lower-pitch noise eliminating need addi tional muffling achieving realistic sound general public noise noise Lets keep em quiet used 3/2-in P-SI plastic spinner CB Though looks quite attractive find myself picturing Tru-Turn machined aluminum spinner would look instead now com pany offering larger sizes polished aluminum unit would costly would certainly add pro pizzazz thats hard re sist Covering finishing Plastic film covering accepted norm todays modelers film easier faster apply contrib utes vast weight saving Its quite since put painted finish sport aircraft really dont miss fun doing good paint job used Coverites Black Baron film Prime Cut material new quarter-scale plane built-up structure Per magloss Super Coverite would contribute added strength totally sheeted foamcored model like Prime Cut knew plastic film would work fine Black Baron film requires lower heat set ting application Id previously used 20-year-old-plus heat sealing iron couldnt turned down low enough bought Coverite Black Baron iron pocket thermometers exact monitoring temperature Blackstone coating iron makes nice slippery Its lot easier use old iron lacked coating Using Coverite thermometer found setting around 225 0F worked best allover application film chose basic red-andwhite covering scheme overlapped film about /2 seams Black Baron easy apply showing little tendency bubble soft cloth used rub down bubbles assure total adhesion trimmed white areas blue stripe cut metal straightedge razor blade Black Baron film Positioning care fully ironed stripe place no trouble ironing stretching Black Baron ma terial particularly easy apply around com pound curves such tips tail surfaces Planning use red blue stars trim em phasis picked up some Coverite Graphics Trim Sheets purpose trim sheet material press-on adhesive backed simply pressed place after being cut desired shape Continued page 142 September 1989 139 SPECIALISTS IN CUSTOM COX TEE DEE & REED ENGINES O2OS 0495 051S074S& 09S ALL CUS TOM & STOCK PARTS VAILABLE INDIVIDUALLY COMPETITION ACCESSORIES & CUSTOMIZED K&B ENGINES RACING WHEELS KLOTZ OIL CARBON FIBER SOLID LINES ALL KINDS OF FUEL TUBING FOUR BRANDS OFGLOWPLUGS HA RD-TO-FIND HARD WARE OLD TIMER SUPPLIES COILS CONDENSERS NGK & STIlT SPARK PLUGS SILK 12 COLORS QUALITY DOPE BRUSHES 5& 7LOOP 1/4RUBBER BANDS TRANSISTOR IGNITION SYSTEMS RESISTOR HIGH TENSION LEADS 1/2A TEXACO PLA YBOY SR KIT 1/2A TEXACO ENGINES & PARTS KSB & IGNITION TIMERS RUBBER POWER KITS PROPS TISSUE AND OTHER SUPPLIES CYANOACRYLA TES & EPOXIES ORDER BY MAIL OR PHONE 019 729-4395 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING & HANDLING FEE $200 FOR INSURANCE ADD $100 STOCK ORDERS SHIPPED WITHIN 24 HRS Idle-Bar Glow Plugs Long Shortoniy $1 89 Also. Traditional line non-idle bar Glow Plugs Six Types 3 Heat Ranges High Performance Glow Element Blow Proof Seal Only $149 Swanson Associates PO Box 151 Wayne NJ nce 784a 07470 r PO Box 16621 Dept M Irvine CA 92714 714 250-1107 h. Prime Cut/Sarpolus Continued page 139 However found easier way Coverite offers die-cut sheet stars package containing 62 stars four sizes purchased pack red blue stars lifted off put air plane really easy trimming job Im sold Black Baron film Coverite also offers Black Baron epoxy paint colors match film its available spray cans would good choice fi berglass cowl wheel pants Flying Prime Cut solid stable flier thats nice responsive want wring out youre used flying larger air craft youll need literally adjust sights model appears same size sky smaller would youre flying too far out made lot faraway landings bigger models until learned gauge distance accurately bring closer Large aircraft quite stable landing ap proaches dont bounce around Bleed off speed bring model set plane down gently Aerobatics fun Prime Cut maneuvers require certain amount thought piloting skill cant horse around airplane would Ugly Stik smoke system definitely adds special air show appearance Treat big ones plenty respect thoughan 18-in prop big piece lumber can real damage Always have helper hanging behind aircraft start engine run up Safe flying watchword Radio Technique/Myers Continued page 33 Advanced Unlimited contestant except Basic category con structs figures FAT-CAT elements Free Program Thus figure commonly called Immelmann consists half-loop up ward entered upright level flight 721 K lf-roll exit upright level flight 9l32K4foratotalK l0Thedecimal numbers parentheses FAI-CAT numbers locate particular elements catalog corresponding K-factors Figures judged IAC competition elements no limit number elements can combined create figure long can keep within TACs Acrobatic Zone measures 3300 ft square 3500 ft above ground level AGL top zone 3280 ft AGL Unlimited cate gory bottom zone 1500 ft AGL Basic Sportsman 1200 ft AGL Intermediate 800 ft AGL Ad vanced 328 ft AGL Unlimited An TAC sequence list figures per formed sequentially during trip through Aerobatic Zone has sum K-factors appro priate category being flown order someone ground able judge well flier performs Free Pro gram flier must write paper performed IAC provides forms B C purpose Some judge must check competitors Free Program Forms B C before event involves lot work FAI-CAT adding machinefor both judge competitor Thats reason judges have familiar FAI-CAT TAC categories must fly Known Compul sory sequences made up cat egory published yearly IAC diffi culty flying Known Compulsory sequence increases Basic Unlimited first flight event competitor Known Compulsory also qualifying flight majority judges votes competi tor has demonstrated ability safely control aircraft disqualified category AMA could likewise Let digress Model Aviations Compe tition Newsletter section June 1989 issue pages 139-140 moment will find description IMAC International Miniature Aerobatics Club its compulsory sequences 1989 Aresti diagrams given names figures K factors can see what am discussing has used RC model world since 1974 Its new havent heard about before Now back airplanes can sit IAC has no compulsory advancements category competitors category pilot flies some what dependent airplane because air planes too weak structurally lack suffi cient power perform Advanced Unlimited category figures Intermediate Advanced Unlimited catego ries must also fly Unknown Compulsory Pro gram Unknown Compulsory constructed IAC headquarters supplied contest organizers particular contest Now come peculiarity Only pilots Unlimited category allowed perform Graded Unlimited Four-Minute Free Program program judged Originality K ersatility K armony & Rhythm K xecution K so done OUR REV-UP INVENTORY VERA GES OVER 9000 PROPS ii IMMEDIATE SHIPMENT ON VISAIMC CARBON FIBER LAMINATES Aerospace Composite Products offers variety rigid carbon fiber/epoxy sheets add stiffness almost material- fiberglass foam bal sawood laminates can used reinforce foam wings leading trailing edges wing spars Carbon Fiber bonds easily slow setting cyanoacrylates 5-minute epoxies laminate can stripped narrower widths CL-i 007 thick 1x48-$500 1x72-$700 CL-2 014 thick 1x48-$800 1x72-$1100 Send SASE information additional sizes products Add S300 shipping handling Calif residents add 6% tax Overseas orders add 15%-Order COD send check money order w r41 1nh1z VIIIIIII 1It5iIIIII51I source lightweight materials