HERES SPORT aerobatic Electric looks like full-scale airplane performs like Gas model Tigerkitten E began take shape mind late 1988 After about year building flying Electrics watching flying others built growing tired backhanded complimentsyou know flies pretty well Electric time something about After spending several months analyzing existing Electric designs giving lot thought what really wanted new airplane began taking proven designone flight characteristics wantedand making work electric power chose Bobcat Mk2 February 1988 Model Builder Reducing models size Id have option using popular 05 motors completely reengineered structure taking advantage near-total lack vibration inherent electric power achieve significant weight reduction done changing Bobcats aerodynamic layout goal maximize performance potential readily available over-the-counter electric power systems state-of-the-art design Tigerkitten created expressly best equipment achieve good sport aerobatic performance put lot time thought finding particular combination wing area structure would offset weight penalty motor batteries currently available Performance compares favorably what experienced Gas modelers have come expect airplanes wont have make excuses model field Neither takeoff performance nor durability compromised Tigerkitten E operates restriction off surface might expect fly engine-powered model similar size achieved using somewhat greater wing area hence lower wing loading other popular models intended 05 power airplane exemplifies dictum Build fly crash Tigerkitten strong enough handle reasonable flight landing loads wasnt meant used sod hammer first prototype red-and-yellow color scheme weighs 56 oz its current power system configuration wing area 450 sq yields wing loading just under 18 oz per sq ftvery good aerobatic model size plane shows no structural deterioration after year active flying Though true love Scale entered Tigerkitten local AMA Novice Pattern competition its first contest just see what would happen As Electric field tied Gas model first place .e two Tigerkitten E prototypes after active flying session red-and-yellow model covered Sig SlIray cloth dyed Rit fab ric dye attached sealed clear nitrate dope color finish Stits Polytone full-scale aircraft paint later version uses dopefinished orange Litespan Bahama Blue Stits Polytone no fuel spills worry about planes look great cleanup Put geared Astro cobalt 15 state-of-the-art Electric add 11 x 7 prop either 12-cell 900-mAh SCR battery pack 14 SR 1000 Max cellsand go show gas-power buddies what quiet aerobatics about Dont bother make excuses Electricyou wont need ERobert Benjamin 26 Model Aviation 1990 U S Scalemasters championships Dallas privileged fly /6-scale Porterfield first modeler qualify compete using electric power see article Porterfield Collegiate April 1991 Model Aviation invited demonstrate red-and-yellow prototype during noon break three days flight judging winds never dropped below 20 mph little Kitten flew satisfying basic aerobatic routine surprising large crowd its clean silent flight despite conditions would have discouraged putting Gas models air could include videocassette copy article could see yourself difference Tigerkittens performance compared typical Electric Power systems key Tigerkittens success use very best electric power systems available cannot overemphasize youre serious about Electric flight want enjoy sort performance expect gas power owe yourself spend extra money cobalt motor system Im familiar Astro Flight line cobalt motors recommend Simply put motors will handle high current loads required fly way want fly prolonged basis deteriora tion Pay qualityand enjoy Currently have two prototypes Some minor internal refinements made second reflected plan Otherwise two structurally identical feature different color schemes power systems number prototype began life part attempt optimize performance available 05-size systems Initially used stock geared Astro cobalt 05 turning cleaned-up Rev-Up 11 x 7 prop nominal battery seven 1 200-mAh Sanyo SCR cells Performance acceptable outstanding present use nine SCR 1 200-mAh cells cleaned-up Super M 11 x 814 prop no longer market cleaned-up Rev-Up 11 /2 x 8 offers nearly same performance cut way down power loss dramatically increased rpm replacing stock power connectors Sermos connectors Astro Flight way expected shortly introduce its own low-loss September 1991 27 uui-ruu~u iup 1uw1 i mu i-veuI uu-mMn oauery P8CK TOT smro co balt 15 motor author currently experimenting 16 SR 1250 Magnum cells Ldown tail surfaces No 2 model Note elevator horn pushrod connection tail wheel assembly exit routing receiver antenna nose No 2 prototype cowl removed Stepping up Astro cobalt 05 motor used first prototype geared Astro cobalt 15 author rewarded slightly better performance Mounting dimensions 05 15 motors identical its difficult tell two installations apart close examination ulose-up -wneei ware second prototype Len left back panel cockpit locking pins removable top cowl/cockpit assembly white circles used simulate instrument panel right front panel turtledeck Note small insertion tubes cowl locking pins Right look cockpit opening/cooling air outlet shows rear rudder elevator servos arming switch Astro cobalt 15 system charging plug hidden under instrument panel radio switch connector will competitive Sermos variety perhaps less tricky use Throttle control via Jomar SM-4 optically coupled high-efficiency highrate throttle combination equipment allows effortless takeoffs somewhat rough usually wet grass off normally fly clean sequential loops level fight good Cuban eights point rolls inside square loops proper use throttle retard power cruise level between maneuvers motor throttle battery moderately warm landing Duration about five minutes-plus fly lot aerobatics six seven minutes Im just cruising around considered trade-offusing less voltage fewer cells accepting less challenging performance would increase duration Heres area ongoing improvements cell technology will make Electric flight better future After developing first prototype level realized pushed Astro 05 well beyond commonly perceived limitsalthough nearly far its capable going Moving up geared Astro cobalt 15 second blue-andorange version seemed make lot sense stock geared cobalt 15 nominal battery 12 900-mAh SCR cells APC 11 x 7 prop second prototype slightly outperforms first Im currently flying model number two same cobalt 15 running pack 14 SR 1000 Max cells new Astro Model 205 throttle control throttle well worth attention Although expensive Jomar SM-4 will handle power supplied fully self-contained ready mount making vastly easier set up install power combination turns APC 11 x 7 prop 7200 rpm flies airplane distinct authority have refrained using higher pitched props airplane number two because 11 x 7 pushing cobalt 15 its recommended sustained current level 15 amps motor designed create additional power through application higher voltage contrast 05 used first prototype designed permit higher current draw hence use higher pitched props have ralsed static current nearly 30 amps have yet reach limits either airplane-equipment combination capable being pushed writing Im experimenting battery pack 16 SR 1250 Magnum cells second prototype Thus equipped airplane weighs 62 oz wing loading 20 oz per sq ft just does nominal 12-cell 900-mAli SCR pack limitations sustained current draw SR 1250 Magnums can tolerate appears point Astro cobalt 15 might ideal motor use Performance promises spectacular Ill have leave suspense As write its November western Washington State wont stop raining Let emphasize self-described pushing power systems no way abuses Astro cobalt motors proper understanding current voltage loads motors designed judicious propeller selection proper understanding air cooling equipment use throttle rather extreme performance routinely available radio equipment both airplanes based two Airtronics Championship 7 FM transmitters updated model 92765 dual-conversion 1991 receivers Airtronics 94401 servos very lightweight radio batteries SR Batteries companys 300-mAli airborne receiver packs lightweight reliable allow use fast field charging 28 Model Aviation NO lx isni osa lanaing juax oeny view OT NO 1 proxoxype AC SHEET iMLSA llNDSHIELD PER pqrnwwL0C477N6 P/Al j*iSQ7VPSrWINGER REMOVEASLE 7DP COWLL4NNATED RUDDER TE Yipiy E1JIPI1E//T TRAYI/~ PLY TE 7XOBLER F-7 DU-ERO TAILkJitEEL ASSYLAMINA7D TIP 3/~SQ rn LONEERON /sso SIDL STR I/lEER ii iiy i/osq/iCSt UPRIGHT IJNE&---PP-FI ASTRO COBALT ogOR 75 LERVOS4kSO LOWER LONGE7ON IJITII YB%6C OUTER ClIP s* /C ci PS TRIPIJIJILr WIT/I HOT STUFF /SHEET AILERON TE OUTER COVER IN& ffSHEET SrIFFENER pq F-2 MOLDED FIBEREL4SS COWL WHEEL PINT I3RALRET0Fewr L SPAR OOLJ8ER& VAXIF ASSYIii SI/EAT SKI/I MOLDED F/BEtIiLASS WI/EEL PANT 2YiSULLIVAJI SKY-LITE WI/EEL LA If/NA TED TIP r/GE-RK/rTEN E DESIjSJIED IAN 1/V R 1/ENTAIl IN Ct I%SPINNER COOL/NC- INWKE compromising batteries After comparative testing both airplanes recommend youre already committed particular equipment consider starting off geared Astro cobalt 15 12-cell battery pack Should have geared 05 can expect about same performance nine-cell battery although gross weight will about five ounces lower duration several minutes less 12-cell/cobalt-iS combination gives honest seven- eight-minute flights suppose number higher performance ferrite motors would fly design safely remain unconvinced theyd fly well youre accomplished flier wants try Electric wont have step down performance level youre accustomed Tigerkitten E Its great way get started must take exception notion experienced flier ought start out Electric inexpensive low-powered model Such airplane may simply confirm suspicions about Electrics lack performance What could discouraging Let also emphasize Tigerkitten trainer good trainers both Gas Electric available learning fly way match power performance primary Gas trainer simply equip readymade Electric trainer recommended Astro cobalt power systems Think about Aircraft structure Electric flight Given current state development electric power systems key equaling gas-powered performance compensate weight motor battery rAS- %CUSaM AU ALVAOUR/A SaraOCVU7MC I*LAMUA SPACERS CStWJMMA C5V5/MU /ACMTSU MASSE AUEAAASMMUS U/UTh- CaUSAL ISlAM EASE/MIS proportionately light structure Several characteristics electric power make practical prevent airplanes becoming fragile Because electric power very nearly vibration-free produces no fuel exhaust residue much structure thats essential Gas models becomes redundant Electric absorb damp vibration inherent smoothest running best balanced two- four-stroke engines must include lot plywood thick balsa extra glue contribute nothing airframe strength terms resisting flight loads quarter-inch sheet balsa sides 40-size sport models good example vibration submit appropriately braced %-in %2 sheet would job perfectly well Clearly would eliminate need heavy bath epoxy inside nose just sensibly constructed Electrics problem weve become accustomed building resist vibration structure designed other way tends look suspect Closely allied trend toward using largest engine will stay attached airframe full power Little wonder Gas models have wing loadings reminiscent fat brick though theyll 30 Model Aviation vertical tail rudder completely sembled Construction begins hori zontal vertical tail surfaces laminated wing tip has completely assembled except addition short spar leading edge extension top Note lamination form still place wing structurally complete except installation aileron fuselage sides have joined balsa croaspieces tail post tormers stringers added everything rounded sanding faired rudder hor izontal tail surfaces also place 1443a034flyM34 WVWVOSWVWV WVWVWVWNW4-444 *flRASMVLMWV 344334*7FWSMg*M3LWR PLrIi I34 4M4 4M3334444-737433SacrJ34Wfr33Sf/flA 341344334337 /Sp4*34/34OWTW 443*343 4333443034*34345LI II 4a4ji34A S4-*3/554rVM/S4344433 3M 434 44*37*53434 ILIII hiIL4 -53444 *4343453333[ 433 W3334S434/ 333343334 i34 34033 34 334533433PS 34 4343445 /47 5333334/EAS43SU3443434 1 -4443/Sf434/44034435 34 333 43M 34134/3377 /3/k WuWVnrwW4o33354337*3 g-Mr 334434 4/33434343 3333 --3334334333434 44S34454 3/-I/S 4MEV344 4/444/43/Mg 3443433 AAa344WA3M713w3 4d 444/1-Ti 4LWMW4//4444/ 0 p 3WOE393 3343 0333434 *45/re rn/car34Sfl 3/3343343473433343434*/4M74K3/571334 y3/0/534 353 3303 034334333* ATWA443443434-W3343334 i)034433434M3434#434rn 44334533 M3M43 7/ rIGRKIrrEN E 33334 34CM flrcar 443433 534340 43343 Car 3 jS-We Full-Size Plans AvailableSee Page 1 88Detailed construction notes accompany lull-size plans climb straight up easily enough accustomed seeing sort thing perfectly airworthy structure designed withstand normal flight loads reasonable handling too often strikes us flimsy youve built Free Flight models already understand keep Tigerkitten light intended its important use materials appropriate dimensions Several other considerations must kept mind Wood selection critical place contest-grade balsa available better hobby shops Though its somewhat expensive garden-variety stuff itNmakes difference Goodquality balsa four- six-pound density can save six ounces total weight choice adhesive equally critical isnt time lots heavy epoxy use Hot Stuff products exclusively Both Tigerkittens built thick variety UFO cyanoacrylate CyA glue occasional shot fast-setting thin variety Independent tests have shown Hot Stuff far strongest CyAs hobby market have observed UFO formulation can eliminate problems irritation sensitive individuals youre uncomfortable using type material indeed have allergy problem try aliphatic resin insteadwork area between parts being Any adhesive intended wood does itsjoined Excessive glue squeezeout removable top cowl permits battery replacement seconds Fibergiassing cowl adds Immensely strength durability No 1 model has flown year abso lutely no problems related cowl surrounding fuselage structure September 1991 31 sign sloppy work adds excess weight would-be craftsman recommends layer glue wiped outside joint betrays ignorance principles wood aircraft construction Wet area joined thoroughly lightly glue use light clamping pressure joining parts youll job right Make fit sand some build smarter subject weight Ill give some targets aim completed wing fiberglassed hinges place servo covering/finish should weigh between five seven ounces completely finished wing airplane number two weighs 85 oz flight ready bare fuselage/tail assembly motor battery landing gear radio should weigh between six eight ounces can hit weights use appropriate covering/finish install recommended equivalent power radio equipment youll have no problems related weight Covering finishing Several options available Doubtless will choose among one-step plastic film coverings comment suggest accept slight weight penalty sake somewhat greater structural rigidity heavier films offer models structure intended rely some degree tension covering torsional rigidity lightest films wont help much personally prefer traditional approach covering finishing both opportunity exercise craftsmanship because greater strength durability properly executed fabric-and-dope finish provides type covering can shrunk tighter plastic film painted finish permanently seals locks seams Airplane number covered Sig Silray cloth dyed Rit fabric dye attached sealed clear nitrate dope color finish Stits Polytone fullscale aircraft paint part Stits Process aircraft covering finishing system Stits Polytone best stuff Ive ever seen finishing airplanes size light one-part paint excellent covering power its easy spray forgiving overspray repair fuelproof glow-power friend slops fuel airplane totally nonshrinking Think about last wish write Stits information brochure manual describing companys entire product line full-scale use both available address given end article should mention Polytone paint referred intended use over Continued page 134 32 Model Aviation basic top cowl components ready assembly view base plate has opened up sufficiently accept 05 battery packs No 1 prototype airframe structurally complete ready covering Since Tigerkittens structure relies some degree tension covering tor sional rigidity use heavier film coverings old-fashioned fabric-and-dope Bet kitten brings good luck its namesake photos Robert Benlamin high-current terminal voltage seven volts 7000 millivolts total 57 millivolts average would represent 008% loss As example 10000 rpm nominal loss associated two-pin connector set would about 16 rpm would visible three-digit tack percentage rpm loss would course smaller higher cell counts Incidentally info new connectors Since have no accumulated histoty application cant say connector performance will hold up repeated mating However have no reason expect significant deterioration normal modeling use including use charging function often exercised electrical joint separate charge jack Id like close month short story about power Im always impressed seemingly awesome power can associate Astro 60 some impressive-sounding big imported motors example 60 28-cell pack peak current condition say 30 amps over horsepower C 840 watts assuming volt per cell Certainly kilowatt in-bounds Awesome huh Well just put things perspective recently enjoyed social conversation third-year physics graduate student telling project working particular developing power supply particle accelerator power supply develops megavolt supplies megampere 60 nanoseconds say supply develops 1000000 volts delivers 1000000 amps terawatt 0000000060 seconds voltage rise time 20 nanoseconds giving slew rate about 50 mega-megavolts per second Next time youre wallowing thoughts awesome power biggest Electric reflect above kinda puts us place wouldnt ya say Incidentally can anyone guess what project uses switch wire Finally case youre wondering Electric Installations will continue future another column closes Please have happy safe Electric flying season See ya Greatest Electric Show EarthKRC D & G BALSA SAVE ON YOUR BALSA & PLYWOOD NEEDS NO MINIMUM ORDER SEND SASE FOR PRICE LIST 2422 N Marks #373 Fresno CA 93722 Ph 277-WOOD 209 277-9663 RC Tiger/Benjamin Continued page 32 Stits covering base finish products have determined purposes works very well over clear nitrate dope did use Stits Process line exactly indicated full-scale aircraft Scalemasters Porterfield excellent results Tigerkitten number two covered new product called Litespan heatshrink plastic made England Litespan imported distributed Idealair Models Charlies R/C Goodies Its available number transparent opaque colors weighs 1/ oz per sq ftlighter comparable material market Like Micafilm its applied using iron separate brushed-on adhesive unlike Micafilm Litespan paintablereally tested quite few samples before deciding use stuff Tigerkitten blue-and-orange airplane covered transparent orange Litespan finished two coats clear nitrate dope shrinks tighter heating Bahama Blue Stits Polytone white striping tape two coats clear Polytone An Electric covered Litespan added paint finish would probably hold up well advantages paint finish making covering significantly tauter adding gloss durability worth several ounces added weight custom Tigerkitten E markings both airplanes made order Vinylwrite Custom Lettering Preparing flight chosen covering finish place put everything back together certain works way want Set control throws give aileron differential about two can done either bending aileron control horns forward attaching pushrods servo output aft center use combination both purpose eliminate need 134 Model Aviation DEMOUNTABLE HINGE Demountable easy * Construction * Finishing * Repair 1/4 inch Fourmost Demountable Hinge gapless Nylon hinge allows modeler easily remove control surfaces model 1/32 inch piano wire holds hinge place Hinge may installed easily CA adhesives Hinge sold packages 12 6 inch segments sufficient span 3 feet hinge Although manufactured white Hinge may dyed painted match finish Hinge deflects plus minus 45 degrees Price 3 ft $495 Product No 141 Fourmost Products 503 357-2732 PATCHES CUSTOM AND STOCK EMBROIDERED EMBLEMS NAMEBADGES FOR CLUBS AiRCRAFT MEMORABIUA JEWELRY PINS TACKS HATS BUCKLES DESK NAMEPLATES PENSETS AND MORE SASE FOR CATALOG GENERAllON PRODUCTS CO INC 3000 KAVANAUGH SUITE B LITTLE ROCK ARKANSAS 72205 SINCE 1977 coordinating rudder aileron prevent adverse yaw turns Start about 200 up 100 down Elevator movement should 200 way rudder least 350 Once youre comfortable model may want increase movements somewhat Install battery pack move around until airplane balances point shown plan25% chord balance point airplane properly responsive controls becoming jumpy Spin entry level snap rolls positive sufficient elevator throw used recovery virtually instantaneous Ive dragged both airplanes nose-high low speed over sky having anything violent mush down speed got too low suggest test Tigerkitten E balance point decide want snappier stall maneuvers move center-of-gravity back between 30% 33% cannot overstress importance doing thorough job preflight testing entire airplane its systems Range-check motor running Use ESV expanded scale voltmeter receiver transmitter batteries beginning flying session Make absolutely certain model balanced aligned warp-free before first flight youll set years rewarding flying Flying Remember start sharp anticipate actions Let airplane build up speed fly off ground fast flat until youre sure what its going Trimmed indicated Tigerkitten E will go essentially point touch positive stability axes Dont afraid blink pay attention stay oriented airplane Tigerkittens seem fD&J ELECTRONICS 900 Lucy Road Howell Michigan 48843 517-546-2644 Service & Repairs Most Radio Control Systems Utilizing Calibrated Test Equipment & Spectrum Analyzer Endorsed AMA RCMA Sticker Station #105 Futaba Airtronics JR Ace HiTec Tower Cirrus World Engines & WE USE GENUINE FACTORY REPLACEMENT PARTS Complete 1991 Narrow Banding & Upgrades RCD / HITEC R/C DEALER Carry Full Line RCD RXs & Products Upgrading. ASK ABOUT THE NEW HOT FOCUS SERIES RADIO CONTROL SYSTEMS FCC Licensed Speed Control Repairs Quality Service Fast Turn Around Shipping & Insurance Extra. UPS Mail VISA / MASTERCARD & DISCOVER WELCOMED AMA #256123ARRLWB8YSQ prefer being brought down little fast side wheel landing attitude mains first tail wheel air rather being three-pointed Once youre ease airplane urge experiment prop/battery combinations am anxious receive input build fly design order establish wider base information power options could ever alone may well 40-size version future fine points design could depend shared experience 05-15 version Good luck think Electric Additional information Stits products available through Bobs Aircraft Supply & Avionics Attention Karen Sandberg Pierce County Airport 17017 Meridian E Puyallup WA 98373 telephone 800331-4375 206-848-9349 Canada Karen Sandberg has agreed make Stits products available direct via mail order quantities modelers use Contact about purchasing copy very complete Stits manual $15 Bill Materials Balsa sheet stock contest grade strip stock light firm 11 /16 x 3 x 36 Two Y16 x 2 x 36 x 2 x 36 4 x 2 x 36 10 Y16-sq x 36 Four A-in sq x 36 Continued page 136 September 1991 135 RENEW 2 See Card Page 99 Foo FIyingS6dac AIoo LondiogGo CIeoConopyAooIobIe B6iIde 86 1255 S6ed 831365 DeI She,d I5 1695 Satisfaction Guaranteedi EAv HINc SH-710 Pkg 24- $295 THE HIGH-TECH HINGE DESIGNED FOR THE CYANOACRYLATE AGE Easier install other hinge No gouging picking messy epoxies Simply cut single knife slot hinge slide hinges place apply few drops favorite CA glue youre done SUPER FAST SUPER EASY SUPER STRONG 7de ea 9e4 foa 6aa SIG MFG CO INC.401-7 So Front StMontezuma IA 50171 623-5154 I ULTIMATESPORT RC 255 EnsI Ahiond/PO Boo 727/Sods Springs idoho 83276 ULIOIAIE ooo sri12085473742EoF~hd,foS,dSASE Eight X V16 X 36 12 / X Yt6 x 36 Eight /16 X x 36 Two x x 36 Two A-in sq x 36 Eight V16 x x 36 Spruce Two A-in sq x 36 Aircraft plywood x 6 x 12 /16 x 12 x 18 / x 6 x 18 Hardware pair 2/s-in Sullivan Skylite wheels Four A-in-dia wheel collars pair Goldberg A-in-dia axle assemblies set Goldberg strip aileron horn assemblies Two small nylon control horns Six 2-56 nylon clevis/rod sets 24-plus servo-mounting sheet metal screws Six 3A x 4-40 allen-head bolts blind nuts Four 3A x 2-56 allen-head bolts locknuts Du-Bro 10-32 nylon wing screw Du-Bro 10-32 brass threaded insert Two small nylon pushrod exit guides 15 small nylon pin-type hinges Du-Bro No 40 tail wheel mount assembly 3A-in tail wheel 2024-T3 x 090-in aluminum alloy appropriate commercial landing gear CB Associates 1 3A-in backplate-type plastic spinner Astro cobalt 05 15 motor system Throttle radio system choice yard 3A-oz fiberglass cloth Covering finish adhesive choice D responding advertisers mention read about Model Aviation RC Helicopters/Jolly Continued page 37 gimbaled Sony color video cam down-link TV transmitter unit super could have some definite industrial rescue applications interested project can contact Juan 415/930-0475 have also playing video-equipped RC aircraft helicopters quite challenge get everything working right comes together oh what picture have understand some great night flying Saturday night Im sorry missed attendance witness Orange County Radio Control Helicopter Association crash crew Kirk Olsen Herb Hoskins Joe Busher putting X Cell 60 back together Evidently switch harness failed during flight Saturday afternoon X-Cell proceeded fly about two minutesapparently mimicking Curtis Youngblood demonstration included inverted flight pirouettesall benefit help transmitter unleashed machine climbed high sky power-dived ground Anyway happy ending Leonard Nitro Alley opened shop crash crew able get parts needed Larry Lloyd Airtronics master radio tech local chopper maniac gave crew Quick Silver fuselage crew patiently watched everyone else fly work Sunday morning late afternoon renovated X-Cell took air flew well before mishap As side note OCRCHA crash crew would like thank Raves RC Products new molded X-Cell tail fins crash crew has completed rigorous field testing finds tail fins absolutely unbreakable through abnonnal usage also ran Gene Engelgau up Bakersfield Gene spending time Larry Lloyd field testing Lightest Pilots Available DARN GOOD AIRMEN Made USAFrom Jennies Jets Pilots Are Best Litelike Latex Rubber Build As Sportsman Barnstormer Bust Pilot KitFull Body Pilot Kit #108 118 acale.$695 #2061/6 scale.$ 995 #106 1/6 scale 205-1/5 scale.1095 #105 1/5 scale #204-1/4 scale.1195 / #104 1/4scale995 #2031/3 scale.1795 #103 1/3 scale.1595 Contains pilot head hands #308 1/8 jet695boots helmet cap goggles #307 1/7 Jet795full templates easy instructions Some simple sewing required Easy Assemble Finish 136 Model Aviation forerunner todays helicopters PCA-2 Pitcairn Autogiro operated regularly commercial firms experimentally US Navy Marines 1/48 WI LLIAMS BROS INC iei PAWNEE ST SAN MARCOS CA 92069619 744-3082 SEND $3 FOR COMPLETE COLOR CATALOG HM Catalog sioonGA DESIGNS Ordering InstructIons See dealer tirst 315 5483779135 East Main StreetDirect orders add $100 P&H NY residents add 70/0 tas FAX 315 5484099Phelps NY 14532 Ds OK
Edition: Model Aviation - 1991/09
Page Numbers: 26, 27, 28, 29, 30, 31, 32, 134, 135, 136
HERES SPORT aerobatic Electric looks like full-scale airplane performs like Gas model Tigerkitten E began take shape mind late 1988 After about year building flying Electrics watching flying others built growing tired backhanded complimentsyou know flies pretty well Electric time something about After spending several months analyzing existing Electric designs giving lot thought what really wanted new airplane began taking proven designone flight characteristics wantedand making work electric power chose Bobcat Mk2 February 1988 Model Builder Reducing models size Id have option using popular 05 motors completely reengineered structure taking advantage near-total lack vibration inherent electric power achieve significant weight reduction done changing Bobcats aerodynamic layout goal maximize performance potential readily available over-the-counter electric power systems state-of-the-art design Tigerkitten created expressly best equipment achieve good sport aerobatic performance put lot time thought finding particular combination wing area structure would offset weight penalty motor batteries currently available Performance compares favorably what experienced Gas modelers have come expect airplanes wont have make excuses model field Neither takeoff performance nor durability compromised Tigerkitten E operates restriction off surface might expect fly engine-powered model similar size achieved using somewhat greater wing area hence lower wing loading other popular models intended 05 power airplane exemplifies dictum Build fly crash Tigerkitten strong enough handle reasonable flight landing loads wasnt meant used sod hammer first prototype red-and-yellow color scheme weighs 56 oz its current power system configuration wing area 450 sq yields wing loading just under 18 oz per sq ftvery good aerobatic model size plane shows no structural deterioration after year active flying Though true love Scale entered Tigerkitten local AMA Novice Pattern competition its first contest just see what would happen As Electric field tied Gas model first place .e two Tigerkitten E prototypes after active flying session red-and-yellow model covered Sig SlIray cloth dyed Rit fab ric dye attached sealed clear nitrate dope color finish Stits Polytone full-scale aircraft paint later version uses dopefinished orange Litespan Bahama Blue Stits Polytone no fuel spills worry about planes look great cleanup Put geared Astro cobalt 15 state-of-the-art Electric add 11 x 7 prop either 12-cell 900-mAh SCR battery pack 14 SR 1000 Max cellsand go show gas-power buddies what quiet aerobatics about Dont bother make excuses Electricyou wont need ERobert Benjamin 26 Model Aviation 1990 U S Scalemasters championships Dallas privileged fly /6-scale Porterfield first modeler qualify compete using electric power see article Porterfield Collegiate April 1991 Model Aviation invited demonstrate red-and-yellow prototype during noon break three days flight judging winds never dropped below 20 mph little Kitten flew satisfying basic aerobatic routine surprising large crowd its clean silent flight despite conditions would have discouraged putting Gas models air could include videocassette copy article could see yourself difference Tigerkittens performance compared typical Electric Power systems key Tigerkittens success use very best electric power systems available cannot overemphasize youre serious about Electric flight want enjoy sort performance expect gas power owe yourself spend extra money cobalt motor system Im familiar Astro Flight line cobalt motors recommend Simply put motors will handle high current loads required fly way want fly prolonged basis deteriora tion Pay qualityand enjoy Currently have two prototypes Some minor internal refinements made second reflected plan Otherwise two structurally identical feature different color schemes power systems number prototype began life part attempt optimize performance available 05-size systems Initially used stock geared Astro cobalt 05 turning cleaned-up Rev-Up 11 x 7 prop nominal battery seven 1 200-mAh Sanyo SCR cells Performance acceptable outstanding present use nine SCR 1 200-mAh cells cleaned-up Super M 11 x 814 prop no longer market cleaned-up Rev-Up 11 /2 x 8 offers nearly same performance cut way down power loss dramatically increased rpm replacing stock power connectors Sermos connectors Astro Flight way expected shortly introduce its own low-loss September 1991 27 uui-ruu~u iup 1uw1 i mu i-veuI uu-mMn oauery P8CK TOT smro co balt 15 motor author currently experimenting 16 SR 1250 Magnum cells Ldown tail surfaces No 2 model Note elevator horn pushrod connection tail wheel assembly exit routing receiver antenna nose No 2 prototype cowl removed Stepping up Astro cobalt 05 motor used first prototype geared Astro cobalt 15 author rewarded slightly better performance Mounting dimensions 05 15 motors identical its difficult tell two installations apart close examination ulose-up -wneei ware second prototype Len left back panel cockpit locking pins removable top cowl/cockpit assembly white circles used simulate instrument panel right front panel turtledeck Note small insertion tubes cowl locking pins Right look cockpit opening/cooling air outlet shows rear rudder elevator servos arming switch Astro cobalt 15 system charging plug hidden under instrument panel radio switch connector will competitive Sermos variety perhaps less tricky use Throttle control via Jomar SM-4 optically coupled high-efficiency highrate throttle combination equipment allows effortless takeoffs somewhat rough usually wet grass off normally fly clean sequential loops level fight good Cuban eights point rolls inside square loops proper use throttle retard power cruise level between maneuvers motor throttle battery moderately warm landing Duration about five minutes-plus fly lot aerobatics six seven minutes Im just cruising around considered trade-offusing less voltage fewer cells accepting less challenging performance would increase duration Heres area ongoing improvements cell technology will make Electric flight better future After developing first prototype level realized pushed Astro 05 well beyond commonly perceived limitsalthough nearly far its capable going Moving up geared Astro cobalt 15 second blue-andorange version seemed make lot sense stock geared cobalt 15 nominal battery 12 900-mAh SCR cells APC 11 x 7 prop second prototype slightly outperforms first Im currently flying model number two same cobalt 15 running pack 14 SR 1000 Max cells new Astro Model 205 throttle control throttle well worth attention Although expensive Jomar SM-4 will handle power supplied fully self-contained ready mount making vastly easier set up install power combination turns APC 11 x 7 prop 7200 rpm flies airplane distinct authority have refrained using higher pitched props airplane number two because 11 x 7 pushing cobalt 15 its recommended sustained current level 15 amps motor designed create additional power through application higher voltage contrast 05 used first prototype designed permit higher current draw hence use higher pitched props have ralsed static current nearly 30 amps have yet reach limits either airplane-equipment combination capable being pushed writing Im experimenting battery pack 16 SR 1250 Magnum cells second prototype Thus equipped airplane weighs 62 oz wing loading 20 oz per sq ft just does nominal 12-cell 900-mAli SCR pack limitations sustained current draw SR 1250 Magnums can tolerate appears point Astro cobalt 15 might ideal motor use Performance promises spectacular Ill have leave suspense As write its November western Washington State wont stop raining Let emphasize self-described pushing power systems no way abuses Astro cobalt motors proper understanding current voltage loads motors designed judicious propeller selection proper understanding air cooling equipment use throttle rather extreme performance routinely available radio equipment both airplanes based two Airtronics Championship 7 FM transmitters updated model 92765 dual-conversion 1991 receivers Airtronics 94401 servos very lightweight radio batteries SR Batteries companys 300-mAli airborne receiver packs lightweight reliable allow use fast field charging 28 Model Aviation NO lx isni osa lanaing juax oeny view OT NO 1 proxoxype AC SHEET iMLSA llNDSHIELD PER pqrnwwL0C477N6 P/Al j*iSQ7VPSrWINGER REMOVEASLE 7DP COWLL4NNATED RUDDER TE Yipiy E1JIPI1E//T TRAYI/~ PLY TE 7XOBLER F-7 DU-ERO TAILkJitEEL ASSYLAMINA7D TIP 3/~SQ rn LONEERON /sso SIDL STR I/lEER ii iiy i/osq/iCSt UPRIGHT IJNE&---PP-FI ASTRO COBALT ogOR 75 LERVOS4kSO LOWER LONGE7ON IJITII YB%6C OUTER ClIP s* /C ci PS TRIPIJIJILr WIT/I HOT STUFF /SHEET AILERON TE OUTER COVER IN& ffSHEET SrIFFENER pq F-2 MOLDED FIBEREL4SS COWL WHEEL PINT I3RALRET0Fewr L SPAR OOLJ8ER& VAXIF ASSYIii SI/EAT SKI/I MOLDED F/BEtIiLASS WI/EEL PANT 2YiSULLIVAJI SKY-LITE WI/EEL LA If/NA TED TIP r/GE-RK/rTEN E DESIjSJIED IAN 1/V R 1/ENTAIl IN Ct I%SPINNER COOL/NC- INWKE compromising batteries After comparative testing both airplanes recommend youre already committed particular equipment consider starting off geared Astro cobalt 15 12-cell battery pack Should have geared 05 can expect about same performance nine-cell battery although gross weight will about five ounces lower duration several minutes less 12-cell/cobalt-iS combination gives honest seven- eight-minute flights suppose number higher performance ferrite motors would fly design safely remain unconvinced theyd fly well youre accomplished flier wants try Electric wont have step down performance level youre accustomed Tigerkitten E Its great way get started must take exception notion experienced flier ought start out Electric inexpensive low-powered model Such airplane may simply confirm suspicions about Electrics lack performance What could discouraging Let also emphasize Tigerkitten trainer good trainers both Gas Electric available learning fly way match power performance primary Gas trainer simply equip readymade Electric trainer recommended Astro cobalt power systems Think about Aircraft structure Electric flight Given current state development electric power systems key equaling gas-powered performance compensate weight motor battery rAS- %CUSaM AU ALVAOUR/A SaraOCVU7MC I*LAMUA SPACERS CStWJMMA C5V5/MU /ACMTSU MASSE AUEAAASMMUS U/UTh- CaUSAL ISlAM EASE/MIS proportionately light structure Several characteristics electric power make practical prevent airplanes becoming fragile Because electric power very nearly vibration-free produces no fuel exhaust residue much structure thats essential Gas models becomes redundant Electric absorb damp vibration inherent smoothest running best balanced two- four-stroke engines must include lot plywood thick balsa extra glue contribute nothing airframe strength terms resisting flight loads quarter-inch sheet balsa sides 40-size sport models good example vibration submit appropriately braced %-in %2 sheet would job perfectly well Clearly would eliminate need heavy bath epoxy inside nose just sensibly constructed Electrics problem weve become accustomed building resist vibration structure designed other way tends look suspect Closely allied trend toward using largest engine will stay attached airframe full power Little wonder Gas models have wing loadings reminiscent fat brick though theyll 30 Model Aviation vertical tail rudder completely sembled Construction begins hori zontal vertical tail surfaces laminated wing tip has completely assembled except addition short spar leading edge extension top Note lamination form still place wing structurally complete except installation aileron fuselage sides have joined balsa croaspieces tail post tormers stringers added everything rounded sanding faired rudder hor izontal tail surfaces also place 1443a034flyM34 WVWVOSWVWV WVWVWVWNW4-444 *flRASMVLMWV 344334*7FWSMg*M3LWR PLrIi I34 4M4 4M3334444-737433SacrJ34Wfr33Sf/flA 341344334337 /Sp4*34/34OWTW 443*343 4333443034*34345LI II 4a4ji34A S4-*3/554rVM/S4344433 3M 434 44*37*53434 ILIII hiIL4 -53444 *4343453333[ 433 W3334S434/ 333343334 i34 34033 34 334533433PS 34 4343445 /47 5333334/EAS43SU3443434 1 -4443/Sf434/44034435 34 333 43M 34134/3377 /3/k WuWVnrwW4o33354337*3 g-Mr 334434 4/33434343 3333 --3334334333434 44S34454 3/-I/S 4MEV344 4/444/43/Mg 3443433 AAa344WA3M713w3 4d 444/1-Ti 4LWMW4//4444/ 0 p 3WOE393 3343 0333434 *45/re rn/car34Sfl 3/3343343473433343434*/4M74K3/571334 y3/0/534 353 3303 034334333* ATWA443443434-W3343334 i)034433434M3434#434rn 44334533 M3M43 7/ rIGRKIrrEN E 33334 34CM flrcar 443433 534340 43343 Car 3 jS-We Full-Size Plans AvailableSee Page 1 88Detailed construction notes accompany lull-size plans climb straight up easily enough accustomed seeing sort thing perfectly airworthy structure designed withstand normal flight loads reasonable handling too often strikes us flimsy youve built Free Flight models already understand keep Tigerkitten light intended its important use materials appropriate dimensions Several other considerations must kept mind Wood selection critical place contest-grade balsa available better hobby shops Though its somewhat expensive garden-variety stuff itNmakes difference Goodquality balsa four- six-pound density can save six ounces total weight choice adhesive equally critical isnt time lots heavy epoxy use Hot Stuff products exclusively Both Tigerkittens built thick variety UFO cyanoacrylate CyA glue occasional shot fast-setting thin variety Independent tests have shown Hot Stuff far strongest CyAs hobby market have observed UFO formulation can eliminate problems irritation sensitive individuals youre uncomfortable using type material indeed have allergy problem try aliphatic resin insteadwork area between parts being Any adhesive intended wood does itsjoined Excessive glue squeezeout removable top cowl permits battery replacement seconds Fibergiassing cowl adds Immensely strength durability No 1 model has flown year abso lutely no problems related cowl surrounding fuselage structure September 1991 31 sign sloppy work adds excess weight would-be craftsman recommends layer glue wiped outside joint betrays ignorance principles wood aircraft construction Wet area joined thoroughly lightly glue use light clamping pressure joining parts youll job right Make fit sand some build smarter subject weight Ill give some targets aim completed wing fiberglassed hinges place servo covering/finish should weigh between five seven ounces completely finished wing airplane number two weighs 85 oz flight ready bare fuselage/tail assembly motor battery landing gear radio should weigh between six eight ounces can hit weights use appropriate covering/finish install recommended equivalent power radio equipment youll have no problems related weight Covering finishing Several options available Doubtless will choose among one-step plastic film coverings comment suggest accept slight weight penalty sake somewhat greater structural rigidity heavier films offer models structure intended rely some degree tension covering torsional rigidity lightest films wont help much personally prefer traditional approach covering finishing both opportunity exercise craftsmanship because greater strength durability properly executed fabric-and-dope finish provides type covering can shrunk tighter plastic film painted finish permanently seals locks seams Airplane number covered Sig Silray cloth dyed Rit fabric dye attached sealed clear nitrate dope color finish Stits Polytone fullscale aircraft paint part Stits Process aircraft covering finishing system Stits Polytone best stuff Ive ever seen finishing airplanes size light one-part paint excellent covering power its easy spray forgiving overspray repair fuelproof glow-power friend slops fuel airplane totally nonshrinking Think about last wish write Stits information brochure manual describing companys entire product line full-scale use both available address given end article should mention Polytone paint referred intended use over Continued page 134 32 Model Aviation basic top cowl components ready assembly view base plate has opened up sufficiently accept 05 battery packs No 1 prototype airframe structurally complete ready covering Since Tigerkittens structure relies some degree tension covering tor sional rigidity use heavier film coverings old-fashioned fabric-and-dope Bet kitten brings good luck its namesake photos Robert Benlamin high-current terminal voltage seven volts 7000 millivolts total 57 millivolts average would represent 008% loss As example 10000 rpm nominal loss associated two-pin connector set would about 16 rpm would visible three-digit tack percentage rpm loss would course smaller higher cell counts Incidentally info new connectors Since have no accumulated histoty application cant say connector performance will hold up repeated mating However have no reason expect significant deterioration normal modeling use including use charging function often exercised electrical joint separate charge jack Id like close month short story about power Im always impressed seemingly awesome power can associate Astro 60 some impressive-sounding big imported motors example 60 28-cell pack peak current condition say 30 amps over horsepower C 840 watts assuming volt per cell Certainly kilowatt in-bounds Awesome huh Well just put things perspective recently enjoyed social conversation third-year physics graduate student telling project working particular developing power supply particle accelerator power supply develops megavolt supplies megampere 60 nanoseconds say supply develops 1000000 volts delivers 1000000 amps terawatt 0000000060 seconds voltage rise time 20 nanoseconds giving slew rate about 50 mega-megavolts per second Next time youre wallowing thoughts awesome power biggest Electric reflect above kinda puts us place wouldnt ya say Incidentally can anyone guess what project uses switch wire Finally case youre wondering Electric Installations will continue future another column closes Please have happy safe Electric flying season See ya Greatest Electric Show EarthKRC D & G BALSA SAVE ON YOUR BALSA & PLYWOOD NEEDS NO MINIMUM ORDER SEND SASE FOR PRICE LIST 2422 N Marks #373 Fresno CA 93722 Ph 277-WOOD 209 277-9663 RC Tiger/Benjamin Continued page 32 Stits covering base finish products have determined purposes works very well over clear nitrate dope did use Stits Process line exactly indicated full-scale aircraft Scalemasters Porterfield excellent results Tigerkitten number two covered new product called Litespan heatshrink plastic made England Litespan imported distributed Idealair Models Charlies R/C Goodies Its available number transparent opaque colors weighs 1/ oz per sq ftlighter comparable material market Like Micafilm its applied using iron separate brushed-on adhesive unlike Micafilm Litespan paintablereally tested quite few samples before deciding use stuff Tigerkitten blue-and-orange airplane covered transparent orange Litespan finished two coats clear nitrate dope shrinks tighter heating Bahama Blue Stits Polytone white striping tape two coats clear Polytone An Electric covered Litespan added paint finish would probably hold up well advantages paint finish making covering significantly tauter adding gloss durability worth several ounces added weight custom Tigerkitten E markings both airplanes made order Vinylwrite Custom Lettering Preparing flight chosen covering finish place put everything back together certain works way want Set control throws give aileron differential about two can done either bending aileron control horns forward attaching pushrods servo output aft center use combination both purpose eliminate need 134 Model Aviation DEMOUNTABLE HINGE Demountable easy * Construction * Finishing * Repair 1/4 inch Fourmost Demountable Hinge gapless Nylon hinge allows modeler easily remove control surfaces model 1/32 inch piano wire holds hinge place Hinge may installed easily CA adhesives Hinge sold packages 12 6 inch segments sufficient span 3 feet hinge Although manufactured white Hinge may dyed painted match finish Hinge deflects plus minus 45 degrees Price 3 ft $495 Product No 141 Fourmost Products 503 357-2732 PATCHES CUSTOM AND STOCK EMBROIDERED EMBLEMS NAMEBADGES FOR CLUBS AiRCRAFT MEMORABIUA JEWELRY PINS TACKS HATS BUCKLES DESK NAMEPLATES PENSETS AND MORE SASE FOR CATALOG GENERAllON PRODUCTS CO INC 3000 KAVANAUGH SUITE B LITTLE ROCK ARKANSAS 72205 SINCE 1977 coordinating rudder aileron prevent adverse yaw turns Start about 200 up 100 down Elevator movement should 200 way rudder least 350 Once youre comfortable model may want increase movements somewhat Install battery pack move around until airplane balances point shown plan25% chord balance point airplane properly responsive controls becoming jumpy Spin entry level snap rolls positive sufficient elevator throw used recovery virtually instantaneous Ive dragged both airplanes nose-high low speed over sky having anything violent mush down speed got too low suggest test Tigerkitten E balance point decide want snappier stall maneuvers move center-of-gravity back between 30% 33% cannot overstress importance doing thorough job preflight testing entire airplane its systems Range-check motor running Use ESV expanded scale voltmeter receiver transmitter batteries beginning flying session Make absolutely certain model balanced aligned warp-free before first flight youll set years rewarding flying Flying Remember start sharp anticipate actions Let airplane build up speed fly off ground fast flat until youre sure what its going Trimmed indicated Tigerkitten E will go essentially point touch positive stability axes Dont afraid blink pay attention stay oriented airplane Tigerkittens seem fD&J ELECTRONICS 900 Lucy Road Howell Michigan 48843 517-546-2644 Service & Repairs Most Radio Control Systems Utilizing Calibrated Test Equipment & Spectrum Analyzer Endorsed AMA RCMA Sticker Station #105 Futaba Airtronics JR Ace HiTec Tower Cirrus World Engines & WE USE GENUINE FACTORY REPLACEMENT PARTS Complete 1991 Narrow Banding & Upgrades RCD / HITEC R/C DEALER Carry Full Line RCD RXs & Products Upgrading. ASK ABOUT THE NEW HOT FOCUS SERIES RADIO CONTROL SYSTEMS FCC Licensed Speed Control Repairs Quality Service Fast Turn Around Shipping & Insurance Extra. UPS Mail VISA / MASTERCARD & DISCOVER WELCOMED AMA #256123ARRLWB8YSQ prefer being brought down little fast side wheel landing attitude mains first tail wheel air rather being three-pointed Once youre ease airplane urge experiment prop/battery combinations am anxious receive input build fly design order establish wider base information power options could ever alone may well 40-size version future fine points design could depend shared experience 05-15 version Good luck think Electric Additional information Stits products available through Bobs Aircraft Supply & Avionics Attention Karen Sandberg Pierce County Airport 17017 Meridian E Puyallup WA 98373 telephone 800331-4375 206-848-9349 Canada Karen Sandberg has agreed make Stits products available direct via mail order quantities modelers use Contact about purchasing copy very complete Stits manual $15 Bill Materials Balsa sheet stock contest grade strip stock light firm 11 /16 x 3 x 36 Two Y16 x 2 x 36 x 2 x 36 4 x 2 x 36 10 Y16-sq x 36 Four A-in sq x 36 Continued page 136 September 1991 135 RENEW 2 See Card Page 99 Foo FIyingS6dac AIoo LondiogGo CIeoConopyAooIobIe B6iIde 86 1255 S6ed 831365 DeI She,d I5 1695 Satisfaction Guaranteedi EAv HINc SH-710 Pkg 24- $295 THE HIGH-TECH HINGE DESIGNED FOR THE CYANOACRYLATE AGE Easier install other hinge No gouging picking messy epoxies Simply cut single knife slot hinge slide hinges place apply few drops favorite CA glue youre done SUPER FAST SUPER EASY SUPER STRONG 7de ea 9e4 foa 6aa SIG MFG CO INC.401-7 So Front StMontezuma IA 50171 623-5154 I ULTIMATESPORT RC 255 EnsI Ahiond/PO Boo 727/Sods Springs idoho 83276 ULIOIAIE ooo sri12085473742EoF~hd,foS,dSASE Eight X V16 X 36 12 / X Yt6 x 36 Eight /16 X x 36 Two x x 36 Two A-in sq x 36 Eight V16 x x 36 Spruce Two A-in sq x 36 Aircraft plywood x 6 x 12 /16 x 12 x 18 / x 6 x 18 Hardware pair 2/s-in Sullivan Skylite wheels Four A-in-dia wheel collars pair Goldberg A-in-dia axle assemblies set Goldberg strip aileron horn assemblies Two small nylon control horns Six 2-56 nylon clevis/rod sets 24-plus servo-mounting sheet metal screws Six 3A x 4-40 allen-head bolts blind nuts Four 3A x 2-56 allen-head bolts locknuts Du-Bro 10-32 nylon wing screw Du-Bro 10-32 brass threaded insert Two small nylon pushrod exit guides 15 small nylon pin-type hinges Du-Bro No 40 tail wheel mount assembly 3A-in tail wheel 2024-T3 x 090-in aluminum alloy appropriate commercial landing gear CB Associates 1 3A-in backplate-type plastic spinner Astro cobalt 05 15 motor system Throttle radio system choice yard 3A-oz fiberglass cloth Covering finish adhesive choice D responding advertisers mention read about Model Aviation RC Helicopters/Jolly Continued page 37 gimbaled Sony color video cam down-link TV transmitter unit super could have some definite industrial rescue applications interested project can contact Juan 415/930-0475 have also playing video-equipped RC aircraft helicopters quite challenge get everything working right comes together oh what picture have understand some great night flying Saturday night Im sorry missed attendance witness Orange County Radio Control Helicopter Association crash crew Kirk Olsen Herb Hoskins Joe Busher putting X Cell 60 back together Evidently switch harness failed during flight Saturday afternoon X-Cell proceeded fly about two minutesapparently mimicking Curtis Youngblood demonstration included inverted flight pirouettesall benefit help transmitter unleashed machine climbed high sky power-dived ground Anyway happy ending Leonard Nitro Alley opened shop crash crew able get parts needed Larry Lloyd Airtronics master radio tech local chopper maniac gave crew Quick Silver fuselage crew patiently watched everyone else fly work Sunday morning late afternoon renovated X-Cell took air flew well before mishap As side note OCRCHA crash crew would like thank Raves RC Products new molded X-Cell tail fins crash crew has completed rigorous field testing finds tail fins absolutely unbreakable through abnonnal usage also ran Gene Engelgau up Bakersfield Gene spending time Larry Lloyd field testing Lightest Pilots Available DARN GOOD AIRMEN Made USAFrom Jennies Jets Pilots Are Best Litelike Latex Rubber Build As Sportsman Barnstormer Bust Pilot KitFull Body Pilot Kit #108 118 acale.$695 #2061/6 scale.$ 995 #106 1/6 scale 205-1/5 scale.1095 #105 1/5 scale #204-1/4 scale.1195 / #104 1/4scale995 #2031/3 scale.1795 #103 1/3 scale.1595 Contains pilot head hands #308 1/8 jet695boots helmet cap goggles #307 1/7 Jet795full templates easy instructions Some simple sewing required Easy Assemble Finish 136 Model Aviation forerunner todays helicopters PCA-2 Pitcairn Autogiro operated regularly commercial firms experimentally US Navy Marines 1/48 WI LLIAMS BROS INC iei PAWNEE ST SAN MARCOS CA 92069619 744-3082 SEND $3 FOR COMPLETE COLOR CATALOG HM Catalog sioonGA DESIGNS Ordering InstructIons See dealer tirst 315 5483779135 East Main StreetDirect orders add $100 P&H NY residents add 70/0 tas FAX 315 5484099Phelps NY 14532 Ds OK
Edition: Model Aviation - 1991/09
Page Numbers: 26, 27, 28, 29, 30, 31, 32, 134, 135, 136
HERES SPORT aerobatic Electric looks like full-scale airplane performs like Gas model Tigerkitten E began take shape mind late 1988 After about year building flying Electrics watching flying others built growing tired backhanded complimentsyou know flies pretty well Electric time something about After spending several months analyzing existing Electric designs giving lot thought what really wanted new airplane began taking proven designone flight characteristics wantedand making work electric power chose Bobcat Mk2 February 1988 Model Builder Reducing models size Id have option using popular 05 motors completely reengineered structure taking advantage near-total lack vibration inherent electric power achieve significant weight reduction done changing Bobcats aerodynamic layout goal maximize performance potential readily available over-the-counter electric power systems state-of-the-art design Tigerkitten created expressly best equipment achieve good sport aerobatic performance put lot time thought finding particular combination wing area structure would offset weight penalty motor batteries currently available Performance compares favorably what experienced Gas modelers have come expect airplanes wont have make excuses model field Neither takeoff performance nor durability compromised Tigerkitten E operates restriction off surface might expect fly engine-powered model similar size achieved using somewhat greater wing area hence lower wing loading other popular models intended 05 power airplane exemplifies dictum Build fly crash Tigerkitten strong enough handle reasonable flight landing loads wasnt meant used sod hammer first prototype red-and-yellow color scheme weighs 56 oz its current power system configuration wing area 450 sq yields wing loading just under 18 oz per sq ftvery good aerobatic model size plane shows no structural deterioration after year active flying Though true love Scale entered Tigerkitten local AMA Novice Pattern competition its first contest just see what would happen As Electric field tied Gas model first place .e two Tigerkitten E prototypes after active flying session red-and-yellow model covered Sig SlIray cloth dyed Rit fab ric dye attached sealed clear nitrate dope color finish Stits Polytone full-scale aircraft paint later version uses dopefinished orange Litespan Bahama Blue Stits Polytone no fuel spills worry about planes look great cleanup Put geared Astro cobalt 15 state-of-the-art Electric add 11 x 7 prop either 12-cell 900-mAh SCR battery pack 14 SR 1000 Max cellsand go show gas-power buddies what quiet aerobatics about Dont bother make excuses Electricyou wont need ERobert Benjamin 26 Model Aviation 1990 U S Scalemasters championships Dallas privileged fly /6-scale Porterfield first modeler qualify compete using electric power see article Porterfield Collegiate April 1991 Model Aviation invited demonstrate red-and-yellow prototype during noon break three days flight judging winds never dropped below 20 mph little Kitten flew satisfying basic aerobatic routine surprising large crowd its clean silent flight despite conditions would have discouraged putting Gas models air could include videocassette copy article could see yourself difference Tigerkittens performance compared typical Electric Power systems key Tigerkittens success use very best electric power systems available cannot overemphasize youre serious about Electric flight want enjoy sort performance expect gas power owe yourself spend extra money cobalt motor system Im familiar Astro Flight line cobalt motors recommend Simply put motors will handle high current loads required fly way want fly prolonged basis deteriora tion Pay qualityand enjoy Currently have two prototypes Some minor internal refinements made second reflected plan Otherwise two structurally identical feature different color schemes power systems number prototype began life part attempt optimize performance available 05-size systems Initially used stock geared Astro cobalt 05 turning cleaned-up Rev-Up 11 x 7 prop nominal battery seven 1 200-mAh Sanyo SCR cells Performance acceptable outstanding present use nine SCR 1 200-mAh cells cleaned-up Super M 11 x 814 prop no longer market cleaned-up Rev-Up 11 /2 x 8 offers nearly same performance cut way down power loss dramatically increased rpm replacing stock power connectors Sermos connectors Astro Flight way expected shortly introduce its own low-loss September 1991 27 uui-ruu~u iup 1uw1 i mu i-veuI uu-mMn oauery P8CK TOT smro co balt 15 motor author currently experimenting 16 SR 1250 Magnum cells Ldown tail surfaces No 2 model Note elevator horn pushrod connection tail wheel assembly exit routing receiver antenna nose No 2 prototype cowl removed Stepping up Astro cobalt 05 motor used first prototype geared Astro cobalt 15 author rewarded slightly better performance Mounting dimensions 05 15 motors identical its difficult tell two installations apart close examination ulose-up -wneei ware second prototype Len left back panel cockpit locking pins removable top cowl/cockpit assembly white circles used simulate instrument panel right front panel turtledeck Note small insertion tubes cowl locking pins Right look cockpit opening/cooling air outlet shows rear rudder elevator servos arming switch Astro cobalt 15 system charging plug hidden under instrument panel radio switch connector will competitive Sermos variety perhaps less tricky use Throttle control via Jomar SM-4 optically coupled high-efficiency highrate throttle combination equipment allows effortless takeoffs somewhat rough usually wet grass off normally fly clean sequential loops level fight good Cuban eights point rolls inside square loops proper use throttle retard power cruise level between maneuvers motor throttle battery moderately warm landing Duration about five minutes-plus fly lot aerobatics six seven minutes Im just cruising around considered trade-offusing less voltage fewer cells accepting less challenging performance would increase duration Heres area ongoing improvements cell technology will make Electric flight better future After developing first prototype level realized pushed Astro 05 well beyond commonly perceived limitsalthough nearly far its capable going Moving up geared Astro cobalt 15 second blue-andorange version seemed make lot sense stock geared cobalt 15 nominal battery 12 900-mAh SCR cells APC 11 x 7 prop second prototype slightly outperforms first Im currently flying model number two same cobalt 15 running pack 14 SR 1000 Max cells new Astro Model 205 throttle control throttle well worth attention Although expensive Jomar SM-4 will handle power supplied fully self-contained ready mount making vastly easier set up install power combination turns APC 11 x 7 prop 7200 rpm flies airplane distinct authority have refrained using higher pitched props airplane number two because 11 x 7 pushing cobalt 15 its recommended sustained current level 15 amps motor designed create additional power through application higher voltage contrast 05 used first prototype designed permit higher current draw hence use higher pitched props have ralsed static current nearly 30 amps have yet reach limits either airplane-equipment combination capable being pushed writing Im experimenting battery pack 16 SR 1250 Magnum cells second prototype Thus equipped airplane weighs 62 oz wing loading 20 oz per sq ft just does nominal 12-cell 900-mAli SCR pack limitations sustained current draw SR 1250 Magnums can tolerate appears point Astro cobalt 15 might ideal motor use Performance promises spectacular Ill have leave suspense As write its November western Washington State wont stop raining Let emphasize self-described pushing power systems no way abuses Astro cobalt motors proper understanding current voltage loads motors designed judicious propeller selection proper understanding air cooling equipment use throttle rather extreme performance routinely available radio equipment both airplanes based two Airtronics Championship 7 FM transmitters updated model 92765 dual-conversion 1991 receivers Airtronics 94401 servos very lightweight radio batteries SR Batteries companys 300-mAli airborne receiver packs lightweight reliable allow use fast field charging 28 Model Aviation NO lx isni osa lanaing juax oeny view OT NO 1 proxoxype AC SHEET iMLSA llNDSHIELD PER pqrnwwL0C477N6 P/Al j*iSQ7VPSrWINGER REMOVEASLE 7DP COWLL4NNATED RUDDER TE Yipiy E1JIPI1E//T TRAYI/~ PLY TE 7XOBLER F-7 DU-ERO TAILkJitEEL ASSYLAMINA7D TIP 3/~SQ rn LONEERON /sso SIDL STR I/lEER ii iiy i/osq/iCSt UPRIGHT IJNE&---PP-FI ASTRO COBALT ogOR 75 LERVOS4kSO LOWER LONGE7ON IJITII YB%6C OUTER ClIP s* /C ci PS TRIPIJIJILr WIT/I HOT STUFF /SHEET AILERON TE OUTER COVER IN& ffSHEET SrIFFENER pq F-2 MOLDED FIBEREL4SS COWL WHEEL PINT I3RALRET0Fewr L SPAR OOLJ8ER& VAXIF ASSYIii SI/EAT SKI/I MOLDED F/BEtIiLASS WI/EEL PANT 2YiSULLIVAJI SKY-LITE WI/EEL LA If/NA TED TIP r/GE-RK/rTEN E DESIjSJIED IAN 1/V R 1/ENTAIl IN Ct I%SPINNER COOL/NC- INWKE compromising batteries After comparative testing both airplanes recommend youre already committed particular equipment consider starting off geared Astro cobalt 15 12-cell battery pack Should have geared 05 can expect about same performance nine-cell battery although gross weight will about five ounces lower duration several minutes less 12-cell/cobalt-iS combination gives honest seven- eight-minute flights suppose number higher performance ferrite motors would fly design safely remain unconvinced theyd fly well youre accomplished flier wants try Electric wont have step down performance level youre accustomed Tigerkitten E Its great way get started must take exception notion experienced flier ought start out Electric inexpensive low-powered model Such airplane may simply confirm suspicions about Electrics lack performance What could discouraging Let also emphasize Tigerkitten trainer good trainers both Gas Electric available learning fly way match power performance primary Gas trainer simply equip readymade Electric trainer recommended Astro cobalt power systems Think about Aircraft structure Electric flight Given current state development electric power systems key equaling gas-powered performance compensate weight motor battery rAS- %CUSaM AU ALVAOUR/A SaraOCVU7MC I*LAMUA SPACERS CStWJMMA C5V5/MU /ACMTSU MASSE AUEAAASMMUS U/UTh- CaUSAL ISlAM EASE/MIS proportionately light structure Several characteristics electric power make practical prevent airplanes becoming fragile Because electric power very nearly vibration-free produces no fuel exhaust residue much structure thats essential Gas models becomes redundant Electric absorb damp vibration inherent smoothest running best balanced two- four-stroke engines must include lot plywood thick balsa extra glue contribute nothing airframe strength terms resisting flight loads quarter-inch sheet balsa sides 40-size sport models good example vibration submit appropriately braced %-in %2 sheet would job perfectly well Clearly would eliminate need heavy bath epoxy inside nose just sensibly constructed Electrics problem weve become accustomed building resist vibration structure designed other way tends look suspect Closely allied trend toward using largest engine will stay attached airframe full power Little wonder Gas models have wing loadings reminiscent fat brick though theyll 30 Model Aviation vertical tail rudder completely sembled Construction begins hori zontal vertical tail surfaces laminated wing tip has completely assembled except addition short spar leading edge extension top Note lamination form still place wing structurally complete except installation aileron fuselage sides have joined balsa croaspieces tail post tormers stringers added everything rounded sanding faired rudder hor izontal tail surfaces also place 1443a034flyM34 WVWVOSWVWV WVWVWVWNW4-444 *flRASMVLMWV 344334*7FWSMg*M3LWR PLrIi I34 4M4 4M3334444-737433SacrJ34Wfr33Sf/flA 341344334337 /Sp4*34/34OWTW 443*343 4333443034*34345LI II 4a4ji34A S4-*3/554rVM/S4344433 3M 434 44*37*53434 ILIII hiIL4 -53444 *4343453333[ 433 W3334S434/ 333343334 i34 34033 34 334533433PS 34 4343445 /47 5333334/EAS43SU3443434 1 -4443/Sf434/44034435 34 333 43M 34134/3377 /3/k WuWVnrwW4o33354337*3 g-Mr 334434 4/33434343 3333 --3334334333434 44S34454 3/-I/S 4MEV344 4/444/43/Mg 3443433 AAa344WA3M713w3 4d 444/1-Ti 4LWMW4//4444/ 0 p 3WOE393 3343 0333434 *45/re rn/car34Sfl 3/3343343473433343434*/4M74K3/571334 y3/0/534 353 3303 034334333* ATWA443443434-W3343334 i)034433434M3434#434rn 44334533 M3M43 7/ rIGRKIrrEN E 33334 34CM flrcar 443433 534340 43343 Car 3 jS-We Full-Size Plans AvailableSee Page 1 88Detailed construction notes accompany lull-size plans climb straight up easily enough accustomed seeing sort thing perfectly airworthy structure designed withstand normal flight loads reasonable handling too often strikes us flimsy youve built Free Flight models already understand keep Tigerkitten light intended its important use materials appropriate dimensions Several other considerations must kept mind Wood selection critical place contest-grade balsa available better hobby shops Though its somewhat expensive garden-variety stuff itNmakes difference Goodquality balsa four- six-pound density can save six ounces total weight choice adhesive equally critical isnt time lots heavy epoxy use Hot Stuff products exclusively Both Tigerkittens built thick variety UFO cyanoacrylate CyA glue occasional shot fast-setting thin variety Independent tests have shown Hot Stuff far strongest CyAs hobby market have observed UFO formulation can eliminate problems irritation sensitive individuals youre uncomfortable using type material indeed have allergy problem try aliphatic resin insteadwork area between parts being Any adhesive intended wood does itsjoined Excessive glue squeezeout removable top cowl permits battery replacement seconds Fibergiassing cowl adds Immensely strength durability No 1 model has flown year abso lutely no problems related cowl surrounding fuselage structure September 1991 31 sign sloppy work adds excess weight would-be craftsman recommends layer glue wiped outside joint betrays ignorance principles wood aircraft construction Wet area joined thoroughly lightly glue use light clamping pressure joining parts youll job right Make fit sand some build smarter subject weight Ill give some targets aim completed wing fiberglassed hinges place servo covering/finish should weigh between five seven ounces completely finished wing airplane number two weighs 85 oz flight ready bare fuselage/tail assembly motor battery landing gear radio should weigh between six eight ounces can hit weights use appropriate covering/finish install recommended equivalent power radio equipment youll have no problems related weight Covering finishing Several options available Doubtless will choose among one-step plastic film coverings comment suggest accept slight weight penalty sake somewhat greater structural rigidity heavier films offer models structure intended rely some degree tension covering torsional rigidity lightest films wont help much personally prefer traditional approach covering finishing both opportunity exercise craftsmanship because greater strength durability properly executed fabric-and-dope finish provides type covering can shrunk tighter plastic film painted finish permanently seals locks seams Airplane number covered Sig Silray cloth dyed Rit fabric dye attached sealed clear nitrate dope color finish Stits Polytone fullscale aircraft paint part Stits Process aircraft covering finishing system Stits Polytone best stuff Ive ever seen finishing airplanes size light one-part paint excellent covering power its easy spray forgiving overspray repair fuelproof glow-power friend slops fuel airplane totally nonshrinking Think about last wish write Stits information brochure manual describing companys entire product line full-scale use both available address given end article should mention Polytone paint referred intended use over Continued page 134 32 Model Aviation basic top cowl components ready assembly view base plate has opened up sufficiently accept 05 battery packs No 1 prototype airframe structurally complete ready covering Since Tigerkittens structure relies some degree tension covering tor sional rigidity use heavier film coverings old-fashioned fabric-and-dope Bet kitten brings good luck its namesake photos Robert Benlamin high-current terminal voltage seven volts 7000 millivolts total 57 millivolts average would represent 008% loss As example 10000 rpm nominal loss associated two-pin connector set would about 16 rpm would visible three-digit tack percentage rpm loss would course smaller higher cell counts Incidentally info new connectors Since have no accumulated histoty application cant say connector performance will hold up repeated mating However have no reason expect significant deterioration normal modeling use including use charging function often exercised electrical joint separate charge jack Id like close month short story about power Im always impressed seemingly awesome power can associate Astro 60 some impressive-sounding big imported motors example 60 28-cell pack peak current condition say 30 amps over horsepower C 840 watts assuming volt per cell Certainly kilowatt in-bounds Awesome huh Well just put things perspective recently enjoyed social conversation third-year physics graduate student telling project working particular developing power supply particle accelerator power supply develops megavolt supplies megampere 60 nanoseconds say supply develops 1000000 volts delivers 1000000 amps terawatt 0000000060 seconds voltage rise time 20 nanoseconds giving slew rate about 50 mega-megavolts per second Next time youre wallowing thoughts awesome power biggest Electric reflect above kinda puts us place wouldnt ya say Incidentally can anyone guess what project uses switch wire Finally case youre wondering Electric Installations will continue future another column closes Please have happy safe Electric flying season See ya Greatest Electric Show EarthKRC D & G BALSA SAVE ON YOUR BALSA & PLYWOOD NEEDS NO MINIMUM ORDER SEND SASE FOR PRICE LIST 2422 N Marks #373 Fresno CA 93722 Ph 277-WOOD 209 277-9663 RC Tiger/Benjamin Continued page 32 Stits covering base finish products have determined purposes works very well over clear nitrate dope did use Stits Process line exactly indicated full-scale aircraft Scalemasters Porterfield excellent results Tigerkitten number two covered new product called Litespan heatshrink plastic made England Litespan imported distributed Idealair Models Charlies R/C Goodies Its available number transparent opaque colors weighs 1/ oz per sq ftlighter comparable material market Like Micafilm its applied using iron separate brushed-on adhesive unlike Micafilm Litespan paintablereally tested quite few samples before deciding use stuff Tigerkitten blue-and-orange airplane covered transparent orange Litespan finished two coats clear nitrate dope shrinks tighter heating Bahama Blue Stits Polytone white striping tape two coats clear Polytone An Electric covered Litespan added paint finish would probably hold up well advantages paint finish making covering significantly tauter adding gloss durability worth several ounces added weight custom Tigerkitten E markings both airplanes made order Vinylwrite Custom Lettering Preparing flight chosen covering finish place put everything back together certain works way want Set control throws give aileron differential about two can done either bending aileron control horns forward attaching pushrods servo output aft center use combination both purpose eliminate need 134 Model Aviation DEMOUNTABLE HINGE Demountable easy * Construction * Finishing * Repair 1/4 inch Fourmost Demountable Hinge gapless Nylon hinge allows modeler easily remove control surfaces model 1/32 inch piano wire holds hinge place Hinge may installed easily CA adhesives Hinge sold packages 12 6 inch segments sufficient span 3 feet hinge Although manufactured white Hinge may dyed painted match finish Hinge deflects plus minus 45 degrees Price 3 ft $495 Product No 141 Fourmost Products 503 357-2732 PATCHES CUSTOM AND STOCK EMBROIDERED EMBLEMS NAMEBADGES FOR CLUBS AiRCRAFT MEMORABIUA JEWELRY PINS TACKS HATS BUCKLES DESK NAMEPLATES PENSETS AND MORE SASE FOR CATALOG GENERAllON PRODUCTS CO INC 3000 KAVANAUGH SUITE B LITTLE ROCK ARKANSAS 72205 SINCE 1977 coordinating rudder aileron prevent adverse yaw turns Start about 200 up 100 down Elevator movement should 200 way rudder least 350 Once youre comfortable model may want increase movements somewhat Install battery pack move around until airplane balances point shown plan25% chord balance point airplane properly responsive controls becoming jumpy Spin entry level snap rolls positive sufficient elevator throw used recovery virtually instantaneous Ive dragged both airplanes nose-high low speed over sky having anything violent mush down speed got too low suggest test Tigerkitten E balance point decide want snappier stall maneuvers move center-of-gravity back between 30% 33% cannot overstress importance doing thorough job preflight testing entire airplane its systems Range-check motor running Use ESV expanded scale voltmeter receiver transmitter batteries beginning flying session Make absolutely certain model balanced aligned warp-free before first flight youll set years rewarding flying Flying Remember start sharp anticipate actions Let airplane build up speed fly off ground fast flat until youre sure what its going Trimmed indicated Tigerkitten E will go essentially point touch positive stability axes Dont afraid blink pay attention stay oriented airplane Tigerkittens seem fD&J ELECTRONICS 900 Lucy Road Howell Michigan 48843 517-546-2644 Service & Repairs Most Radio Control Systems Utilizing Calibrated Test Equipment & Spectrum Analyzer Endorsed AMA RCMA Sticker Station #105 Futaba Airtronics JR Ace HiTec Tower Cirrus World Engines & WE USE GENUINE FACTORY REPLACEMENT PARTS Complete 1991 Narrow Banding & Upgrades RCD / HITEC R/C DEALER Carry Full Line RCD RXs & Products Upgrading. ASK ABOUT THE NEW HOT FOCUS SERIES RADIO CONTROL SYSTEMS FCC Licensed Speed Control Repairs Quality Service Fast Turn Around Shipping & Insurance Extra. UPS Mail VISA / MASTERCARD & DISCOVER WELCOMED AMA #256123ARRLWB8YSQ prefer being brought down little fast side wheel landing attitude mains first tail wheel air rather being three-pointed Once youre ease airplane urge experiment prop/battery combinations am anxious receive input build fly design order establish wider base information power options could ever alone may well 40-size version future fine points design could depend shared experience 05-15 version Good luck think Electric Additional information Stits products available through Bobs Aircraft Supply & Avionics Attention Karen Sandberg Pierce County Airport 17017 Meridian E Puyallup WA 98373 telephone 800331-4375 206-848-9349 Canada Karen Sandberg has agreed make Stits products available direct via mail order quantities modelers use Contact about purchasing copy very complete Stits manual $15 Bill Materials Balsa sheet stock contest grade strip stock light firm 11 /16 x 3 x 36 Two Y16 x 2 x 36 x 2 x 36 4 x 2 x 36 10 Y16-sq x 36 Four A-in sq x 36 Continued page 136 September 1991 135 RENEW 2 See Card Page 99 Foo FIyingS6dac AIoo LondiogGo CIeoConopyAooIobIe B6iIde 86 1255 S6ed 831365 DeI She,d I5 1695 Satisfaction Guaranteedi EAv HINc SH-710 Pkg 24- $295 THE HIGH-TECH HINGE DESIGNED FOR THE CYANOACRYLATE AGE Easier install other hinge No gouging picking messy epoxies Simply cut single knife slot hinge slide hinges place apply few drops favorite CA glue youre done SUPER FAST SUPER EASY SUPER STRONG 7de ea 9e4 foa 6aa SIG MFG CO INC.401-7 So Front StMontezuma IA 50171 623-5154 I ULTIMATESPORT RC 255 EnsI Ahiond/PO Boo 727/Sods Springs idoho 83276 ULIOIAIE ooo sri12085473742EoF~hd,foS,dSASE Eight X V16 X 36 12 / X Yt6 x 36 Eight /16 X x 36 Two x x 36 Two A-in sq x 36 Eight V16 x x 36 Spruce Two A-in sq x 36 Aircraft plywood x 6 x 12 /16 x 12 x 18 / x 6 x 18 Hardware pair 2/s-in Sullivan Skylite wheels Four A-in-dia wheel collars pair Goldberg A-in-dia axle assemblies set Goldberg strip aileron horn assemblies Two small nylon control horns Six 2-56 nylon clevis/rod sets 24-plus servo-mounting sheet metal screws Six 3A x 4-40 allen-head bolts blind nuts Four 3A x 2-56 allen-head bolts locknuts Du-Bro 10-32 nylon wing screw Du-Bro 10-32 brass threaded insert Two small nylon pushrod exit guides 15 small nylon pin-type hinges Du-Bro No 40 tail wheel mount assembly 3A-in tail wheel 2024-T3 x 090-in aluminum alloy appropriate commercial landing gear CB Associates 1 3A-in backplate-type plastic spinner Astro cobalt 05 15 motor system Throttle radio system choice yard 3A-oz fiberglass cloth Covering finish adhesive choice D responding advertisers mention read about Model Aviation RC Helicopters/Jolly Continued page 37 gimbaled Sony color video cam down-link TV transmitter unit super could have some definite industrial rescue applications interested project can contact Juan 415/930-0475 have also playing video-equipped RC aircraft helicopters quite challenge get everything working right comes together oh what picture have understand some great night flying Saturday night Im sorry missed attendance witness Orange County Radio Control Helicopter Association crash crew Kirk Olsen Herb Hoskins Joe Busher putting X Cell 60 back together Evidently switch harness failed during flight Saturday afternoon X-Cell proceeded fly about two minutesapparently mimicking Curtis Youngblood demonstration included inverted flight pirouettesall benefit help transmitter unleashed machine climbed high sky power-dived ground Anyway happy ending Leonard Nitro Alley opened shop crash crew able get parts needed Larry Lloyd Airtronics master radio tech local chopper maniac gave crew Quick Silver fuselage crew patiently watched everyone else fly work Sunday morning late afternoon renovated X-Cell took air flew well before mishap As side note OCRCHA crash crew would like thank Raves RC Products new molded X-Cell tail fins crash crew has completed rigorous field testing finds tail fins absolutely unbreakable through abnonnal usage also ran Gene Engelgau up Bakersfield Gene spending time Larry Lloyd field testing Lightest Pilots Available DARN GOOD AIRMEN Made USAFrom Jennies Jets Pilots Are Best Litelike Latex Rubber Build As Sportsman Barnstormer Bust Pilot KitFull Body Pilot Kit #108 118 acale.$695 #2061/6 scale.$ 995 #106 1/6 scale 205-1/5 scale.1095 #105 1/5 scale #204-1/4 scale.1195 / #104 1/4scale995 #2031/3 scale.1795 #103 1/3 scale.1595 Contains pilot head hands #308 1/8 jet695boots helmet cap goggles #307 1/7 Jet795full templates easy instructions Some simple sewing required Easy Assemble Finish 136 Model Aviation forerunner todays helicopters PCA-2 Pitcairn Autogiro operated regularly commercial firms experimentally US Navy Marines 1/48 WI LLIAMS BROS INC iei PAWNEE ST SAN MARCOS CA 92069619 744-3082 SEND $3 FOR COMPLETE COLOR CATALOG HM Catalog sioonGA DESIGNS Ordering InstructIons See dealer tirst 315 5483779135 East Main StreetDirect orders add $100 P&H NY residents add 70/0 tas FAX 315 5484099Phelps NY 14532 Ds OK
Edition: Model Aviation - 1991/09
Page Numbers: 26, 27, 28, 29, 30, 31, 32, 134, 135, 136
HERES SPORT aerobatic Electric looks like full-scale airplane performs like Gas model Tigerkitten E began take shape mind late 1988 After about year building flying Electrics watching flying others built growing tired backhanded complimentsyou know flies pretty well Electric time something about After spending several months analyzing existing Electric designs giving lot thought what really wanted new airplane began taking proven designone flight characteristics wantedand making work electric power chose Bobcat Mk2 February 1988 Model Builder Reducing models size Id have option using popular 05 motors completely reengineered structure taking advantage near-total lack vibration inherent electric power achieve significant weight reduction done changing Bobcats aerodynamic layout goal maximize performance potential readily available over-the-counter electric power systems state-of-the-art design Tigerkitten created expressly best equipment achieve good sport aerobatic performance put lot time thought finding particular combination wing area structure would offset weight penalty motor batteries currently available Performance compares favorably what experienced Gas modelers have come expect airplanes wont have make excuses model field Neither takeoff performance nor durability compromised Tigerkitten E operates restriction off surface might expect fly engine-powered model similar size achieved using somewhat greater wing area hence lower wing loading other popular models intended 05 power airplane exemplifies dictum Build fly crash Tigerkitten strong enough handle reasonable flight landing loads wasnt meant used sod hammer first prototype red-and-yellow color scheme weighs 56 oz its current power system configuration wing area 450 sq yields wing loading just under 18 oz per sq ftvery good aerobatic model size plane shows no structural deterioration after year active flying Though true love Scale entered Tigerkitten local AMA Novice Pattern competition its first contest just see what would happen As Electric field tied Gas model first place .e two Tigerkitten E prototypes after active flying session red-and-yellow model covered Sig SlIray cloth dyed Rit fab ric dye attached sealed clear nitrate dope color finish Stits Polytone full-scale aircraft paint later version uses dopefinished orange Litespan Bahama Blue Stits Polytone no fuel spills worry about planes look great cleanup Put geared Astro cobalt 15 state-of-the-art Electric add 11 x 7 prop either 12-cell 900-mAh SCR battery pack 14 SR 1000 Max cellsand go show gas-power buddies what quiet aerobatics about Dont bother make excuses Electricyou wont need ERobert Benjamin 26 Model Aviation 1990 U S Scalemasters championships Dallas privileged fly /6-scale Porterfield first modeler qualify compete using electric power see article Porterfield Collegiate April 1991 Model Aviation invited demonstrate red-and-yellow prototype during noon break three days flight judging winds never dropped below 20 mph little Kitten flew satisfying basic aerobatic routine surprising large crowd its clean silent flight despite conditions would have discouraged putting Gas models air could include videocassette copy article could see yourself difference Tigerkittens performance compared typical Electric Power systems key Tigerkittens success use very best electric power systems available cannot overemphasize youre serious about Electric flight want enjoy sort performance expect gas power owe yourself spend extra money cobalt motor system Im familiar Astro Flight line cobalt motors recommend Simply put motors will handle high current loads required fly way want fly prolonged basis deteriora tion Pay qualityand enjoy Currently have two prototypes Some minor internal refinements made second reflected plan Otherwise two structurally identical feature different color schemes power systems number prototype began life part attempt optimize performance available 05-size systems Initially used stock geared Astro cobalt 05 turning cleaned-up Rev-Up 11 x 7 prop nominal battery seven 1 200-mAh Sanyo SCR cells Performance acceptable outstanding present use nine SCR 1 200-mAh cells cleaned-up Super M 11 x 814 prop no longer market cleaned-up Rev-Up 11 /2 x 8 offers nearly same performance cut way down power loss dramatically increased rpm replacing stock power connectors Sermos connectors Astro Flight way expected shortly introduce its own low-loss September 1991 27 uui-ruu~u iup 1uw1 i mu i-veuI uu-mMn oauery P8CK TOT smro co balt 15 motor author currently experimenting 16 SR 1250 Magnum cells Ldown tail surfaces No 2 model Note elevator horn pushrod connection tail wheel assembly exit routing receiver antenna nose No 2 prototype cowl removed Stepping up Astro cobalt 05 motor used first prototype geared Astro cobalt 15 author rewarded slightly better performance Mounting dimensions 05 15 motors identical its difficult tell two installations apart close examination ulose-up -wneei ware second prototype Len left back panel cockpit locking pins removable top cowl/cockpit assembly white circles used simulate instrument panel right front panel turtledeck Note small insertion tubes cowl locking pins Right look cockpit opening/cooling air outlet shows rear rudder elevator servos arming switch Astro cobalt 15 system charging plug hidden under instrument panel radio switch connector will competitive Sermos variety perhaps less tricky use Throttle control via Jomar SM-4 optically coupled high-efficiency highrate throttle combination equipment allows effortless takeoffs somewhat rough usually wet grass off normally fly clean sequential loops level fight good Cuban eights point rolls inside square loops proper use throttle retard power cruise level between maneuvers motor throttle battery moderately warm landing Duration about five minutes-plus fly lot aerobatics six seven minutes Im just cruising around considered trade-offusing less voltage fewer cells accepting less challenging performance would increase duration Heres area ongoing improvements cell technology will make Electric flight better future After developing first prototype level realized pushed Astro 05 well beyond commonly perceived limitsalthough nearly far its capable going Moving up geared Astro cobalt 15 second blue-andorange version seemed make lot sense stock geared cobalt 15 nominal battery 12 900-mAh SCR cells APC 11 x 7 prop second prototype slightly outperforms first Im currently flying model number two same cobalt 15 running pack 14 SR 1000 Max cells new Astro Model 205 throttle control throttle well worth attention Although expensive Jomar SM-4 will handle power supplied fully self-contained ready mount making vastly easier set up install power combination turns APC 11 x 7 prop 7200 rpm flies airplane distinct authority have refrained using higher pitched props airplane number two because 11 x 7 pushing cobalt 15 its recommended sustained current level 15 amps motor designed create additional power through application higher voltage contrast 05 used first prototype designed permit higher current draw hence use higher pitched props have ralsed static current nearly 30 amps have yet reach limits either airplane-equipment combination capable being pushed writing Im experimenting battery pack 16 SR 1250 Magnum cells second prototype Thus equipped airplane weighs 62 oz wing loading 20 oz per sq ft just does nominal 12-cell 900-mAli SCR pack limitations sustained current draw SR 1250 Magnums can tolerate appears point Astro cobalt 15 might ideal motor use Performance promises spectacular Ill have leave suspense As write its November western Washington State wont stop raining Let emphasize self-described pushing power systems no way abuses Astro cobalt motors proper understanding current voltage loads motors designed judicious propeller selection proper understanding air cooling equipment use throttle rather extreme performance routinely available radio equipment both airplanes based two Airtronics Championship 7 FM transmitters updated model 92765 dual-conversion 1991 receivers Airtronics 94401 servos very lightweight radio batteries SR Batteries companys 300-mAli airborne receiver packs lightweight reliable allow use fast field charging 28 Model Aviation NO lx isni osa lanaing juax oeny view OT NO 1 proxoxype AC SHEET iMLSA llNDSHIELD PER pqrnwwL0C477N6 P/Al j*iSQ7VPSrWINGER REMOVEASLE 7DP COWLL4NNATED RUDDER TE Yipiy E1JIPI1E//T TRAYI/~ PLY TE 7XOBLER F-7 DU-ERO TAILkJitEEL ASSYLAMINA7D TIP 3/~SQ rn LONEERON /sso SIDL STR I/lEER ii iiy i/osq/iCSt UPRIGHT IJNE&---PP-FI ASTRO COBALT ogOR 75 LERVOS4kSO LOWER LONGE7ON IJITII YB%6C OUTER ClIP s* /C ci PS TRIPIJIJILr WIT/I HOT STUFF /SHEET AILERON TE OUTER COVER IN& ffSHEET SrIFFENER pq F-2 MOLDED FIBEREL4SS COWL WHEEL PINT I3RALRET0Fewr L SPAR OOLJ8ER& VAXIF ASSYIii SI/EAT SKI/I MOLDED F/BEtIiLASS WI/EEL PANT 2YiSULLIVAJI SKY-LITE WI/EEL LA If/NA TED TIP r/GE-RK/rTEN E DESIjSJIED IAN 1/V R 1/ENTAIl IN Ct I%SPINNER COOL/NC- INWKE compromising batteries After comparative testing both airplanes recommend youre already committed particular equipment consider starting off geared Astro cobalt 15 12-cell battery pack Should have geared 05 can expect about same performance nine-cell battery although gross weight will about five ounces lower duration several minutes less 12-cell/cobalt-iS combination gives honest seven- eight-minute flights suppose number higher performance ferrite motors would fly design safely remain unconvinced theyd fly well youre accomplished flier wants try Electric wont have step down performance level youre accustomed Tigerkitten E Its great way get started must take exception notion experienced flier ought start out Electric inexpensive low-powered model Such airplane may simply confirm suspicions about Electrics lack performance What could discouraging Let also emphasize Tigerkitten trainer good trainers both Gas Electric available learning fly way match power performance primary Gas trainer simply equip readymade Electric trainer recommended Astro cobalt power systems Think about Aircraft structure Electric flight Given current state development electric power systems key equaling gas-powered performance compensate weight motor battery rAS- %CUSaM AU ALVAOUR/A SaraOCVU7MC I*LAMUA SPACERS CStWJMMA C5V5/MU /ACMTSU MASSE AUEAAASMMUS U/UTh- CaUSAL ISlAM EASE/MIS proportionately light structure Several characteristics electric power make practical prevent airplanes becoming fragile Because electric power very nearly vibration-free produces no fuel exhaust residue much structure thats essential Gas models becomes redundant Electric absorb damp vibration inherent smoothest running best balanced two- four-stroke engines must include lot plywood thick balsa extra glue contribute nothing airframe strength terms resisting flight loads quarter-inch sheet balsa sides 40-size sport models good example vibration submit appropriately braced %-in %2 sheet would job perfectly well Clearly would eliminate need heavy bath epoxy inside nose just sensibly constructed Electrics problem weve become accustomed building resist vibration structure designed other way tends look suspect Closely allied trend toward using largest engine will stay attached airframe full power Little wonder Gas models have wing loadings reminiscent fat brick though theyll 30 Model Aviation vertical tail rudder completely sembled Construction begins hori zontal vertical tail surfaces laminated wing tip has completely assembled except addition short spar leading edge extension top Note lamination form still place wing structurally complete except installation aileron fuselage sides have joined balsa croaspieces tail post tormers stringers added everything rounded sanding faired rudder hor izontal tail surfaces also place 1443a034flyM34 WVWVOSWVWV WVWVWVWNW4-444 *flRASMVLMWV 344334*7FWSMg*M3LWR PLrIi I34 4M4 4M3334444-737433SacrJ34Wfr33Sf/flA 341344334337 /Sp4*34/34OWTW 443*343 4333443034*34345LI II 4a4ji34A S4-*3/554rVM/S4344433 3M 434 44*37*53434 ILIII hiIL4 -53444 *4343453333[ 433 W3334S434/ 333343334 i34 34033 34 334533433PS 34 4343445 /47 5333334/EAS43SU3443434 1 -4443/Sf434/44034435 34 333 43M 34134/3377 /3/k WuWVnrwW4o33354337*3 g-Mr 334434 4/33434343 3333 --3334334333434 44S34454 3/-I/S 4MEV344 4/444/43/Mg 3443433 AAa344WA3M713w3 4d 444/1-Ti 4LWMW4//4444/ 0 p 3WOE393 3343 0333434 *45/re rn/car34Sfl 3/3343343473433343434*/4M74K3/571334 y3/0/534 353 3303 034334333* ATWA443443434-W3343334 i)034433434M3434#434rn 44334533 M3M43 7/ rIGRKIrrEN E 33334 34CM flrcar 443433 534340 43343 Car 3 jS-We Full-Size Plans AvailableSee Page 1 88Detailed construction notes accompany lull-size plans climb straight up easily enough accustomed seeing sort thing perfectly airworthy structure designed withstand normal flight loads reasonable handling too often strikes us flimsy youve built Free Flight models already understand keep Tigerkitten light intended its important use materials appropriate dimensions Several other considerations must kept mind Wood selection critical place contest-grade balsa available better hobby shops Though its somewhat expensive garden-variety stuff itNmakes difference Goodquality balsa four- six-pound density can save six ounces total weight choice adhesive equally critical isnt time lots heavy epoxy use Hot Stuff products exclusively Both Tigerkittens built thick variety UFO cyanoacrylate CyA glue occasional shot fast-setting thin variety Independent tests have shown Hot Stuff far strongest CyAs hobby market have observed UFO formulation can eliminate problems irritation sensitive individuals youre uncomfortable using type material indeed have allergy problem try aliphatic resin insteadwork area between parts being Any adhesive intended wood does itsjoined Excessive glue squeezeout removable top cowl permits battery replacement seconds Fibergiassing cowl adds Immensely strength durability No 1 model has flown year abso lutely no problems related cowl surrounding fuselage structure September 1991 31 sign sloppy work adds excess weight would-be craftsman recommends layer glue wiped outside joint betrays ignorance principles wood aircraft construction Wet area joined thoroughly lightly glue use light clamping pressure joining parts youll job right Make fit sand some build smarter subject weight Ill give some targets aim completed wing fiberglassed hinges place servo covering/finish should weigh between five seven ounces completely finished wing airplane number two weighs 85 oz flight ready bare fuselage/tail assembly motor battery landing gear radio should weigh between six eight ounces can hit weights use appropriate covering/finish install recommended equivalent power radio equipment youll have no problems related weight Covering finishing Several options available Doubtless will choose among one-step plastic film coverings comment suggest accept slight weight penalty sake somewhat greater structural rigidity heavier films offer models structure intended rely some degree tension covering torsional rigidity lightest films wont help much personally prefer traditional approach covering finishing both opportunity exercise craftsmanship because greater strength durability properly executed fabric-and-dope finish provides type covering can shrunk tighter plastic film painted finish permanently seals locks seams Airplane number covered Sig Silray cloth dyed Rit fabric dye attached sealed clear nitrate dope color finish Stits Polytone fullscale aircraft paint part Stits Process aircraft covering finishing system Stits Polytone best stuff Ive ever seen finishing airplanes size light one-part paint excellent covering power its easy spray forgiving overspray repair fuelproof glow-power friend slops fuel airplane totally nonshrinking Think about last wish write Stits information brochure manual describing companys entire product line full-scale use both available address given end article should mention Polytone paint referred intended use over Continued page 134 32 Model Aviation basic top cowl components ready assembly view base plate has opened up sufficiently accept 05 battery packs No 1 prototype airframe structurally complete ready covering Since Tigerkittens structure relies some degree tension covering tor sional rigidity use heavier film coverings old-fashioned fabric-and-dope Bet kitten brings good luck its namesake photos Robert Benlamin high-current terminal voltage seven volts 7000 millivolts total 57 millivolts average would represent 008% loss As example 10000 rpm nominal loss associated two-pin connector set would about 16 rpm would visible three-digit tack percentage rpm loss would course smaller higher cell counts Incidentally info new connectors Since have no accumulated histoty application cant say connector performance will hold up repeated mating However have no reason expect significant deterioration normal modeling use including use charging function often exercised electrical joint separate charge jack Id like close month short story about power Im always impressed seemingly awesome power can associate Astro 60 some impressive-sounding big imported motors example 60 28-cell pack peak current condition say 30 amps over horsepower C 840 watts assuming volt per cell Certainly kilowatt in-bounds Awesome huh Well just put things perspective recently enjoyed social conversation third-year physics graduate student telling project working particular developing power supply particle accelerator power supply develops megavolt supplies megampere 60 nanoseconds say supply develops 1000000 volts delivers 1000000 amps terawatt 0000000060 seconds voltage rise time 20 nanoseconds giving slew rate about 50 mega-megavolts per second Next time youre wallowing thoughts awesome power biggest Electric reflect above kinda puts us place wouldnt ya say Incidentally can anyone guess what project uses switch wire Finally case youre wondering Electric Installations will continue future another column closes Please have happy safe Electric flying season See ya Greatest Electric Show EarthKRC D & G BALSA SAVE ON YOUR BALSA & PLYWOOD NEEDS NO MINIMUM ORDER SEND SASE FOR PRICE LIST 2422 N Marks #373 Fresno CA 93722 Ph 277-WOOD 209 277-9663 RC Tiger/Benjamin Continued page 32 Stits covering base finish products have determined purposes works very well over clear nitrate dope did use Stits Process line exactly indicated full-scale aircraft Scalemasters Porterfield excellent results Tigerkitten number two covered new product called Litespan heatshrink plastic made England Litespan imported distributed Idealair Models Charlies R/C Goodies Its available number transparent opaque colors weighs 1/ oz per sq ftlighter comparable material market Like Micafilm its applied using iron separate brushed-on adhesive unlike Micafilm Litespan paintablereally tested quite few samples before deciding use stuff Tigerkitten blue-and-orange airplane covered transparent orange Litespan finished two coats clear nitrate dope shrinks tighter heating Bahama Blue Stits Polytone white striping tape two coats clear Polytone An Electric covered Litespan added paint finish would probably hold up well advantages paint finish making covering significantly tauter adding gloss durability worth several ounces added weight custom Tigerkitten E markings both airplanes made order Vinylwrite Custom Lettering Preparing flight chosen covering finish place put everything back together certain works way want Set control throws give aileron differential about two can done either bending aileron control horns forward attaching pushrods servo output aft center use combination both purpose eliminate need 134 Model Aviation DEMOUNTABLE HINGE Demountable easy * Construction * Finishing * Repair 1/4 inch Fourmost Demountable Hinge gapless Nylon hinge allows modeler easily remove control surfaces model 1/32 inch piano wire holds hinge place Hinge may installed easily CA adhesives Hinge sold packages 12 6 inch segments sufficient span 3 feet hinge Although manufactured white Hinge may dyed painted match finish Hinge deflects plus minus 45 degrees Price 3 ft $495 Product No 141 Fourmost Products 503 357-2732 PATCHES CUSTOM AND STOCK EMBROIDERED EMBLEMS NAMEBADGES FOR CLUBS AiRCRAFT MEMORABIUA JEWELRY PINS TACKS HATS BUCKLES DESK NAMEPLATES PENSETS AND MORE SASE FOR CATALOG GENERAllON PRODUCTS CO INC 3000 KAVANAUGH SUITE B LITTLE ROCK ARKANSAS 72205 SINCE 1977 coordinating rudder aileron prevent adverse yaw turns Start about 200 up 100 down Elevator movement should 200 way rudder least 350 Once youre comfortable model may want increase movements somewhat Install battery pack move around until airplane balances point shown plan25% chord balance point airplane properly responsive controls becoming jumpy Spin entry level snap rolls positive sufficient elevator throw used recovery virtually instantaneous Ive dragged both airplanes nose-high low speed over sky having anything violent mush down speed got too low suggest test Tigerkitten E balance point decide want snappier stall maneuvers move center-of-gravity back between 30% 33% cannot overstress importance doing thorough job preflight testing entire airplane its systems Range-check motor running Use ESV expanded scale voltmeter receiver transmitter batteries beginning flying session Make absolutely certain model balanced aligned warp-free before first flight youll set years rewarding flying Flying Remember start sharp anticipate actions Let airplane build up speed fly off ground fast flat until youre sure what its going Trimmed indicated Tigerkitten E will go essentially point touch positive stability axes Dont afraid blink pay attention stay oriented airplane Tigerkittens seem fD&J ELECTRONICS 900 Lucy Road Howell Michigan 48843 517-546-2644 Service & Repairs Most Radio Control Systems Utilizing Calibrated Test Equipment & Spectrum Analyzer Endorsed AMA RCMA Sticker Station #105 Futaba Airtronics JR Ace HiTec Tower Cirrus World Engines & WE USE GENUINE FACTORY REPLACEMENT PARTS Complete 1991 Narrow Banding & Upgrades RCD / HITEC R/C DEALER Carry Full Line RCD RXs & Products Upgrading. ASK ABOUT THE NEW HOT FOCUS SERIES RADIO CONTROL SYSTEMS FCC Licensed Speed Control Repairs Quality Service Fast Turn Around Shipping & Insurance Extra. UPS Mail VISA / MASTERCARD & DISCOVER WELCOMED AMA #256123ARRLWB8YSQ prefer being brought down little fast side wheel landing attitude mains first tail wheel air rather being three-pointed Once youre ease airplane urge experiment prop/battery combinations am anxious receive input build fly design order establish wider base information power options could ever alone may well 40-size version future fine points design could depend shared experience 05-15 version Good luck think Electric Additional information Stits products available through Bobs Aircraft Supply & Avionics Attention Karen Sandberg Pierce County Airport 17017 Meridian E Puyallup WA 98373 telephone 800331-4375 206-848-9349 Canada Karen Sandberg has agreed make Stits products available direct via mail order quantities modelers use Contact about purchasing copy very complete Stits manual $15 Bill Materials Balsa sheet stock contest grade strip stock light firm 11 /16 x 3 x 36 Two Y16 x 2 x 36 x 2 x 36 4 x 2 x 36 10 Y16-sq x 36 Four A-in sq x 36 Continued page 136 September 1991 135 RENEW 2 See Card Page 99 Foo FIyingS6dac AIoo LondiogGo CIeoConopyAooIobIe B6iIde 86 1255 S6ed 831365 DeI She,d I5 1695 Satisfaction Guaranteedi EAv HINc SH-710 Pkg 24- $295 THE HIGH-TECH HINGE DESIGNED FOR THE CYANOACRYLATE AGE Easier install other hinge No gouging picking messy epoxies Simply cut single knife slot hinge slide hinges place apply few drops favorite CA glue youre done SUPER FAST SUPER EASY SUPER STRONG 7de ea 9e4 foa 6aa SIG MFG CO INC.401-7 So Front StMontezuma IA 50171 623-5154 I ULTIMATESPORT RC 255 EnsI Ahiond/PO Boo 727/Sods Springs idoho 83276 ULIOIAIE ooo sri12085473742EoF~hd,foS,dSASE Eight X V16 X 36 12 / X Yt6 x 36 Eight /16 X x 36 Two x x 36 Two A-in sq x 36 Eight V16 x x 36 Spruce Two A-in sq x 36 Aircraft plywood x 6 x 12 /16 x 12 x 18 / x 6 x 18 Hardware pair 2/s-in Sullivan Skylite wheels Four A-in-dia wheel collars pair Goldberg A-in-dia axle assemblies set Goldberg strip aileron horn assemblies Two small nylon control horns Six 2-56 nylon clevis/rod sets 24-plus servo-mounting sheet metal screws Six 3A x 4-40 allen-head bolts blind nuts Four 3A x 2-56 allen-head bolts locknuts Du-Bro 10-32 nylon wing screw Du-Bro 10-32 brass threaded insert Two small nylon pushrod exit guides 15 small nylon pin-type hinges Du-Bro No 40 tail wheel mount assembly 3A-in tail wheel 2024-T3 x 090-in aluminum alloy appropriate commercial landing gear CB Associates 1 3A-in backplate-type plastic spinner Astro cobalt 05 15 motor system Throttle radio system choice yard 3A-oz fiberglass cloth Covering finish adhesive choice D responding advertisers mention read about Model Aviation RC Helicopters/Jolly Continued page 37 gimbaled Sony color video cam down-link TV transmitter unit super could have some definite industrial rescue applications interested project can contact Juan 415/930-0475 have also playing video-equipped RC aircraft helicopters quite challenge get everything working right comes together oh what picture have understand some great night flying Saturday night Im sorry missed attendance witness Orange County Radio Control Helicopter Association crash crew Kirk Olsen Herb Hoskins Joe Busher putting X Cell 60 back together Evidently switch harness failed during flight Saturday afternoon X-Cell proceeded fly about two minutesapparently mimicking Curtis Youngblood demonstration included inverted flight pirouettesall benefit help transmitter unleashed machine climbed high sky power-dived ground Anyway happy ending Leonard Nitro Alley opened shop crash crew able get parts needed Larry Lloyd Airtronics master radio tech local chopper maniac gave crew Quick Silver fuselage crew patiently watched everyone else fly work Sunday morning late afternoon renovated X-Cell took air flew well before mishap As side note OCRCHA crash crew would like thank Raves RC Products new molded X-Cell tail fins crash crew has completed rigorous field testing finds tail fins absolutely unbreakable through abnonnal usage also ran Gene Engelgau up Bakersfield Gene spending time Larry Lloyd field testing Lightest Pilots Available DARN GOOD AIRMEN Made USAFrom Jennies Jets Pilots Are Best Litelike Latex Rubber Build As Sportsman Barnstormer Bust Pilot KitFull Body Pilot Kit #108 118 acale.$695 #2061/6 scale.$ 995 #106 1/6 scale 205-1/5 scale.1095 #105 1/5 scale #204-1/4 scale.1195 / #104 1/4scale995 #2031/3 scale.1795 #103 1/3 scale.1595 Contains pilot head hands #308 1/8 jet695boots helmet cap goggles #307 1/7 Jet795full templates easy instructions Some simple sewing required Easy Assemble Finish 136 Model Aviation forerunner todays helicopters PCA-2 Pitcairn Autogiro operated regularly commercial firms experimentally US Navy Marines 1/48 WI LLIAMS BROS INC iei PAWNEE ST SAN MARCOS CA 92069619 744-3082 SEND $3 FOR COMPLETE COLOR CATALOG HM Catalog sioonGA DESIGNS Ordering InstructIons See dealer tirst 315 5483779135 East Main StreetDirect orders add $100 P&H NY residents add 70/0 tas FAX 315 5484099Phelps NY 14532 Ds OK
Edition: Model Aviation - 1991/09
Page Numbers: 26, 27, 28, 29, 30, 31, 32, 134, 135, 136
HERES SPORT aerobatic Electric looks like full-scale airplane performs like Gas model Tigerkitten E began take shape mind late 1988 After about year building flying Electrics watching flying others built growing tired backhanded complimentsyou know flies pretty well Electric time something about After spending several months analyzing existing Electric designs giving lot thought what really wanted new airplane began taking proven designone flight characteristics wantedand making work electric power chose Bobcat Mk2 February 1988 Model Builder Reducing models size Id have option using popular 05 motors completely reengineered structure taking advantage near-total lack vibration inherent electric power achieve significant weight reduction done changing Bobcats aerodynamic layout goal maximize performance potential readily available over-the-counter electric power systems state-of-the-art design Tigerkitten created expressly best equipment achieve good sport aerobatic performance put lot time thought finding particular combination wing area structure would offset weight penalty motor batteries currently available Performance compares favorably what experienced Gas modelers have come expect airplanes wont have make excuses model field Neither takeoff performance nor durability compromised Tigerkitten E operates restriction off surface might expect fly engine-powered model similar size achieved using somewhat greater wing area hence lower wing loading other popular models intended 05 power airplane exemplifies dictum Build fly crash Tigerkitten strong enough handle reasonable flight landing loads wasnt meant used sod hammer first prototype red-and-yellow color scheme weighs 56 oz its current power system configuration wing area 450 sq yields wing loading just under 18 oz per sq ftvery good aerobatic model size plane shows no structural deterioration after year active flying Though true love Scale entered Tigerkitten local AMA Novice Pattern competition its first contest just see what would happen As Electric field tied Gas model first place .e two Tigerkitten E prototypes after active flying session red-and-yellow model covered Sig SlIray cloth dyed Rit fab ric dye attached sealed clear nitrate dope color finish Stits Polytone full-scale aircraft paint later version uses dopefinished orange Litespan Bahama Blue Stits Polytone no fuel spills worry about planes look great cleanup Put geared Astro cobalt 15 state-of-the-art Electric add 11 x 7 prop either 12-cell 900-mAh SCR battery pack 14 SR 1000 Max cellsand go show gas-power buddies what quiet aerobatics about Dont bother make excuses Electricyou wont need ERobert Benjamin 26 Model Aviation 1990 U S Scalemasters championships Dallas privileged fly /6-scale Porterfield first modeler qualify compete using electric power see article Porterfield Collegiate April 1991 Model Aviation invited demonstrate red-and-yellow prototype during noon break three days flight judging winds never dropped below 20 mph little Kitten flew satisfying basic aerobatic routine surprising large crowd its clean silent flight despite conditions would have discouraged putting Gas models air could include videocassette copy article could see yourself difference Tigerkittens performance compared typical Electric Power systems key Tigerkittens success use very best electric power systems available cannot overemphasize youre serious about Electric flight want enjoy sort performance expect gas power owe yourself spend extra money cobalt motor system Im familiar Astro Flight line cobalt motors recommend Simply put motors will handle high current loads required fly way want fly prolonged basis deteriora tion Pay qualityand enjoy Currently have two prototypes Some minor internal refinements made second reflected plan Otherwise two structurally identical feature different color schemes power systems number prototype began life part attempt optimize performance available 05-size systems Initially used stock geared Astro cobalt 05 turning cleaned-up Rev-Up 11 x 7 prop nominal battery seven 1 200-mAh Sanyo SCR cells Performance acceptable outstanding present use nine SCR 1 200-mAh cells cleaned-up Super M 11 x 814 prop no longer market cleaned-up Rev-Up 11 /2 x 8 offers nearly same performance cut way down power loss dramatically increased rpm replacing stock power connectors Sermos connectors Astro Flight way expected shortly introduce its own low-loss September 1991 27 uui-ruu~u iup 1uw1 i mu i-veuI uu-mMn oauery P8CK TOT smro co balt 15 motor author currently experimenting 16 SR 1250 Magnum cells Ldown tail surfaces No 2 model Note elevator horn pushrod connection tail wheel assembly exit routing receiver antenna nose No 2 prototype cowl removed Stepping up Astro cobalt 05 motor used first prototype geared Astro cobalt 15 author rewarded slightly better performance Mounting dimensions 05 15 motors identical its difficult tell two installations apart close examination ulose-up -wneei ware second prototype Len left back panel cockpit locking pins removable top cowl/cockpit assembly white circles used simulate instrument panel right front panel turtledeck Note small insertion tubes cowl locking pins Right look cockpit opening/cooling air outlet shows rear rudder elevator servos arming switch Astro cobalt 15 system charging plug hidden under instrument panel radio switch connector will competitive Sermos variety perhaps less tricky use Throttle control via Jomar SM-4 optically coupled high-efficiency highrate throttle combination equipment allows effortless takeoffs somewhat rough usually wet grass off normally fly clean sequential loops level fight good Cuban eights point rolls inside square loops proper use throttle retard power cruise level between maneuvers motor throttle battery moderately warm landing Duration about five minutes-plus fly lot aerobatics six seven minutes Im just cruising around considered trade-offusing less voltage fewer cells accepting less challenging performance would increase duration Heres area ongoing improvements cell technology will make Electric flight better future After developing first prototype level realized pushed Astro 05 well beyond commonly perceived limitsalthough nearly far its capable going Moving up geared Astro cobalt 15 second blue-andorange version seemed make lot sense stock geared cobalt 15 nominal battery 12 900-mAh SCR cells APC 11 x 7 prop second prototype slightly outperforms first Im currently flying model number two same cobalt 15 running pack 14 SR 1000 Max cells new Astro Model 205 throttle control throttle well worth attention Although expensive Jomar SM-4 will handle power supplied fully self-contained ready mount making vastly easier set up install power combination turns APC 11 x 7 prop 7200 rpm flies airplane distinct authority have refrained using higher pitched props airplane number two because 11 x 7 pushing cobalt 15 its recommended sustained current level 15 amps motor designed create additional power through application higher voltage contrast 05 used first prototype designed permit higher current draw hence use higher pitched props have ralsed static current nearly 30 amps have yet reach limits either airplane-equipment combination capable being pushed writing Im experimenting battery pack 16 SR 1250 Magnum cells second prototype Thus equipped airplane weighs 62 oz wing loading 20 oz per sq ft just does nominal 12-cell 900-mAli SCR pack limitations sustained current draw SR 1250 Magnums can tolerate appears point Astro cobalt 15 might ideal motor use Performance promises spectacular Ill have leave suspense As write its November western Washington State wont stop raining Let emphasize self-described pushing power systems no way abuses Astro cobalt motors proper understanding current voltage loads motors designed judicious propeller selection proper understanding air cooling equipment use throttle rather extreme performance routinely available radio equipment both airplanes based two Airtronics Championship 7 FM transmitters updated model 92765 dual-conversion 1991 receivers Airtronics 94401 servos very lightweight radio batteries SR Batteries companys 300-mAli airborne receiver packs lightweight reliable allow use fast field charging 28 Model Aviation NO lx isni osa lanaing juax oeny view OT NO 1 proxoxype AC SHEET iMLSA llNDSHIELD PER pqrnwwL0C477N6 P/Al j*iSQ7VPSrWINGER REMOVEASLE 7DP COWLL4NNATED RUDDER TE Yipiy E1JIPI1E//T TRAYI/~ PLY TE 7XOBLER F-7 DU-ERO TAILkJitEEL ASSYLAMINA7D TIP 3/~SQ rn LONEERON /sso SIDL STR I/lEER ii iiy i/osq/iCSt UPRIGHT IJNE&---PP-FI ASTRO COBALT ogOR 75 LERVOS4kSO LOWER LONGE7ON IJITII YB%6C OUTER ClIP s* /C ci PS TRIPIJIJILr WIT/I HOT STUFF /SHEET AILERON TE OUTER COVER IN& ffSHEET SrIFFENER pq F-2 MOLDED FIBEREL4SS COWL WHEEL PINT I3RALRET0Fewr L SPAR OOLJ8ER& VAXIF ASSYIii SI/EAT SKI/I MOLDED F/BEtIiLASS WI/EEL PANT 2YiSULLIVAJI SKY-LITE WI/EEL LA If/NA TED TIP r/GE-RK/rTEN E DESIjSJIED IAN 1/V R 1/ENTAIl IN Ct I%SPINNER COOL/NC- INWKE compromising batteries After comparative testing both airplanes recommend youre already committed particular equipment consider starting off geared Astro cobalt 15 12-cell battery pack Should have geared 05 can expect about same performance nine-cell battery although gross weight will about five ounces lower duration several minutes less 12-cell/cobalt-iS combination gives honest seven- eight-minute flights suppose number higher performance ferrite motors would fly design safely remain unconvinced theyd fly well youre accomplished flier wants try Electric wont have step down performance level youre accustomed Tigerkitten E Its great way get started must take exception notion experienced flier ought start out Electric inexpensive low-powered model Such airplane may simply confirm suspicions about Electrics lack performance What could discouraging Let also emphasize Tigerkitten trainer good trainers both Gas Electric available learning fly way match power performance primary Gas trainer simply equip readymade Electric trainer recommended Astro cobalt power systems Think about Aircraft structure Electric flight Given current state development electric power systems key equaling gas-powered performance compensate weight motor battery rAS- %CUSaM AU ALVAOUR/A SaraOCVU7MC I*LAMUA SPACERS CStWJMMA C5V5/MU /ACMTSU MASSE AUEAAASMMUS U/UTh- CaUSAL ISlAM EASE/MIS proportionately light structure Several characteristics electric power make practical prevent airplanes becoming fragile Because electric power very nearly vibration-free produces no fuel exhaust residue much structure thats essential Gas models becomes redundant Electric absorb damp vibration inherent smoothest running best balanced two- four-stroke engines must include lot plywood thick balsa extra glue contribute nothing airframe strength terms resisting flight loads quarter-inch sheet balsa sides 40-size sport models good example vibration submit appropriately braced %-in %2 sheet would job perfectly well Clearly would eliminate need heavy bath epoxy inside nose just sensibly constructed Electrics problem weve become accustomed building resist vibration structure designed other way tends look suspect Closely allied trend toward using largest engine will stay attached airframe full power Little wonder Gas models have wing loadings reminiscent fat brick though theyll 30 Model Aviation vertical tail rudder completely sembled Construction begins hori zontal vertical tail surfaces laminated wing tip has completely assembled except addition short spar leading edge extension top Note lamination form still place wing structurally complete except installation aileron fuselage sides have joined balsa croaspieces tail post tormers stringers added everything rounded sanding faired rudder hor izontal tail surfaces also place 1443a034flyM34 WVWVOSWVWV WVWVWVWNW4-444 *flRASMVLMWV 344334*7FWSMg*M3LWR PLrIi I34 4M4 4M3334444-737433SacrJ34Wfr33Sf/flA 341344334337 /Sp4*34/34OWTW 443*343 4333443034*34345LI II 4a4ji34A S4-*3/554rVM/S4344433 3M 434 44*37*53434 ILIII hiIL4 -53444 *4343453333[ 433 W3334S434/ 333343334 i34 34033 34 334533433PS 34 4343445 /47 5333334/EAS43SU3443434 1 -4443/Sf434/44034435 34 333 43M 34134/3377 /3/k WuWVnrwW4o33354337*3 g-Mr 334434 4/33434343 3333 --3334334333434 44S34454 3/-I/S 4MEV344 4/444/43/Mg 3443433 AAa344WA3M713w3 4d 444/1-Ti 4LWMW4//4444/ 0 p 3WOE393 3343 0333434 *45/re rn/car34Sfl 3/3343343473433343434*/4M74K3/571334 y3/0/534 353 3303 034334333* ATWA443443434-W3343334 i)034433434M3434#434rn 44334533 M3M43 7/ rIGRKIrrEN E 33334 34CM flrcar 443433 534340 43343 Car 3 jS-We Full-Size Plans AvailableSee Page 1 88Detailed construction notes accompany lull-size plans climb straight up easily enough accustomed seeing sort thing perfectly airworthy structure designed withstand normal flight loads reasonable handling too often strikes us flimsy youve built Free Flight models already understand keep Tigerkitten light intended its important use materials appropriate dimensions Several other considerations must kept mind Wood selection critical place contest-grade balsa available better hobby shops Though its somewhat expensive garden-variety stuff itNmakes difference Goodquality balsa four- six-pound density can save six ounces total weight choice adhesive equally critical isnt time lots heavy epoxy use Hot Stuff products exclusively Both Tigerkittens built thick variety UFO cyanoacrylate CyA glue occasional shot fast-setting thin variety Independent tests have shown Hot Stuff far strongest CyAs hobby market have observed UFO formulation can eliminate problems irritation sensitive individuals youre uncomfortable using type material indeed have allergy problem try aliphatic resin insteadwork area between parts being Any adhesive intended wood does itsjoined Excessive glue squeezeout removable top cowl permits battery replacement seconds Fibergiassing cowl adds Immensely strength durability No 1 model has flown year abso lutely no problems related cowl surrounding fuselage structure September 1991 31 sign sloppy work adds excess weight would-be craftsman recommends layer glue wiped outside joint betrays ignorance principles wood aircraft construction Wet area joined thoroughly lightly glue use light clamping pressure joining parts youll job right Make fit sand some build smarter subject weight Ill give some targets aim completed wing fiberglassed hinges place servo covering/finish should weigh between five seven ounces completely finished wing airplane number two weighs 85 oz flight ready bare fuselage/tail assembly motor battery landing gear radio should weigh between six eight ounces can hit weights use appropriate covering/finish install recommended equivalent power radio equipment youll have no problems related weight Covering finishing Several options available Doubtless will choose among one-step plastic film coverings comment suggest accept slight weight penalty sake somewhat greater structural rigidity heavier films offer models structure intended rely some degree tension covering torsional rigidity lightest films wont help much personally prefer traditional approach covering finishing both opportunity exercise craftsmanship because greater strength durability properly executed fabric-and-dope finish provides type covering can shrunk tighter plastic film painted finish permanently seals locks seams Airplane number covered Sig Silray cloth dyed Rit fabric dye attached sealed clear nitrate dope color finish Stits Polytone fullscale aircraft paint part Stits Process aircraft covering finishing system Stits Polytone best stuff Ive ever seen finishing airplanes size light one-part paint excellent covering power its easy spray forgiving overspray repair fuelproof glow-power friend slops fuel airplane totally nonshrinking Think about last wish write Stits information brochure manual describing companys entire product line full-scale use both available address given end article should mention Polytone paint referred intended use over Continued page 134 32 Model Aviation basic top cowl components ready assembly view base plate has opened up sufficiently accept 05 battery packs No 1 prototype airframe structurally complete ready covering Since Tigerkittens structure relies some degree tension covering tor sional rigidity use heavier film coverings old-fashioned fabric-and-dope Bet kitten brings good luck its namesake photos Robert Benlamin high-current terminal voltage seven volts 7000 millivolts total 57 millivolts average would represent 008% loss As example 10000 rpm nominal loss associated two-pin connector set would about 16 rpm would visible three-digit tack percentage rpm loss would course smaller higher cell counts Incidentally info new connectors Since have no accumulated histoty application cant say connector performance will hold up repeated mating However have no reason expect significant deterioration normal modeling use including use charging function often exercised electrical joint separate charge jack Id like close month short story about power Im always impressed seemingly awesome power can associate Astro 60 some impressive-sounding big imported motors example 60 28-cell pack peak current condition say 30 amps over horsepower C 840 watts assuming volt per cell Certainly kilowatt in-bounds Awesome huh Well just put things perspective recently enjoyed social conversation third-year physics graduate student telling project working particular developing power supply particle accelerator power supply develops megavolt supplies megampere 60 nanoseconds say supply develops 1000000 volts delivers 1000000 amps terawatt 0000000060 seconds voltage rise time 20 nanoseconds giving slew rate about 50 mega-megavolts per second Next time youre wallowing thoughts awesome power biggest Electric reflect above kinda puts us place wouldnt ya say Incidentally can anyone guess what project uses switch wire Finally case youre wondering Electric Installations will continue future another column closes Please have happy safe Electric flying season See ya Greatest Electric Show EarthKRC D & G BALSA SAVE ON YOUR BALSA & PLYWOOD NEEDS NO MINIMUM ORDER SEND SASE FOR PRICE LIST 2422 N Marks #373 Fresno CA 93722 Ph 277-WOOD 209 277-9663 RC Tiger/Benjamin Continued page 32 Stits covering base finish products have determined purposes works very well over clear nitrate dope did use Stits Process line exactly indicated full-scale aircraft Scalemasters Porterfield excellent results Tigerkitten number two covered new product called Litespan heatshrink plastic made England Litespan imported distributed Idealair Models Charlies R/C Goodies Its available number transparent opaque colors weighs 1/ oz per sq ftlighter comparable material market Like Micafilm its applied using iron separate brushed-on adhesive unlike Micafilm Litespan paintablereally tested quite few samples before deciding use stuff Tigerkitten blue-and-orange airplane covered transparent orange Litespan finished two coats clear nitrate dope shrinks tighter heating Bahama Blue Stits Polytone white striping tape two coats clear Polytone An Electric covered Litespan added paint finish would probably hold up well advantages paint finish making covering significantly tauter adding gloss durability worth several ounces added weight custom Tigerkitten E markings both airplanes made order Vinylwrite Custom Lettering Preparing flight chosen covering finish place put everything back together certain works way want Set control throws give aileron differential about two can done either bending aileron control horns forward attaching pushrods servo output aft center use combination both purpose eliminate need 134 Model Aviation DEMOUNTABLE HINGE Demountable easy * Construction * Finishing * Repair 1/4 inch Fourmost Demountable Hinge gapless Nylon hinge allows modeler easily remove control surfaces model 1/32 inch piano wire holds hinge place Hinge may installed easily CA adhesives Hinge sold packages 12 6 inch segments sufficient span 3 feet hinge Although manufactured white Hinge may dyed painted match finish Hinge deflects plus minus 45 degrees Price 3 ft $495 Product No 141 Fourmost Products 503 357-2732 PATCHES CUSTOM AND STOCK EMBROIDERED EMBLEMS NAMEBADGES FOR CLUBS AiRCRAFT MEMORABIUA JEWELRY PINS TACKS HATS BUCKLES DESK NAMEPLATES PENSETS AND MORE SASE FOR CATALOG GENERAllON PRODUCTS CO INC 3000 KAVANAUGH SUITE B LITTLE ROCK ARKANSAS 72205 SINCE 1977 coordinating rudder aileron prevent adverse yaw turns Start about 200 up 100 down Elevator movement should 200 way rudder least 350 Once youre comfortable model may want increase movements somewhat Install battery pack move around until airplane balances point shown plan25% chord balance point airplane properly responsive controls becoming jumpy Spin entry level snap rolls positive sufficient elevator throw used recovery virtually instantaneous Ive dragged both airplanes nose-high low speed over sky having anything violent mush down speed got too low suggest test Tigerkitten E balance point decide want snappier stall maneuvers move center-of-gravity back between 30% 33% cannot overstress importance doing thorough job preflight testing entire airplane its systems Range-check motor running Use ESV expanded scale voltmeter receiver transmitter batteries beginning flying session Make absolutely certain model balanced aligned warp-free before first flight youll set years rewarding flying Flying Remember start sharp anticipate actions Let airplane build up speed fly off ground fast flat until youre sure what its going Trimmed indicated Tigerkitten E will go essentially point touch positive stability axes Dont afraid blink pay attention stay oriented airplane Tigerkittens seem fD&J ELECTRONICS 900 Lucy Road Howell Michigan 48843 517-546-2644 Service & Repairs Most Radio Control Systems Utilizing Calibrated Test Equipment & Spectrum Analyzer Endorsed AMA RCMA Sticker Station #105 Futaba Airtronics JR Ace HiTec Tower Cirrus World Engines & WE USE GENUINE FACTORY REPLACEMENT PARTS Complete 1991 Narrow Banding & Upgrades RCD / HITEC R/C DEALER Carry Full Line RCD RXs & Products Upgrading. ASK ABOUT THE NEW HOT FOCUS SERIES RADIO CONTROL SYSTEMS FCC Licensed Speed Control Repairs Quality Service Fast Turn Around Shipping & Insurance Extra. UPS Mail VISA / MASTERCARD & DISCOVER WELCOMED AMA #256123ARRLWB8YSQ prefer being brought down little fast side wheel landing attitude mains first tail wheel air rather being three-pointed Once youre ease airplane urge experiment prop/battery combinations am anxious receive input build fly design order establish wider base information power options could ever alone may well 40-size version future fine points design could depend shared experience 05-15 version Good luck think Electric Additional information Stits products available through Bobs Aircraft Supply & Avionics Attention Karen Sandberg Pierce County Airport 17017 Meridian E Puyallup WA 98373 telephone 800331-4375 206-848-9349 Canada Karen Sandberg has agreed make Stits products available direct via mail order quantities modelers use Contact about purchasing copy very complete Stits manual $15 Bill Materials Balsa sheet stock contest grade strip stock light firm 11 /16 x 3 x 36 Two Y16 x 2 x 36 x 2 x 36 4 x 2 x 36 10 Y16-sq x 36 Four A-in sq x 36 Continued page 136 September 1991 135 RENEW 2 See Card Page 99 Foo FIyingS6dac AIoo LondiogGo CIeoConopyAooIobIe B6iIde 86 1255 S6ed 831365 DeI She,d I5 1695 Satisfaction Guaranteedi EAv HINc SH-710 Pkg 24- $295 THE HIGH-TECH HINGE DESIGNED FOR THE CYANOACRYLATE AGE Easier install other hinge No gouging picking messy epoxies Simply cut single knife slot hinge slide hinges place apply few drops favorite CA glue youre done SUPER FAST SUPER EASY SUPER STRONG 7de ea 9e4 foa 6aa SIG MFG CO INC.401-7 So Front StMontezuma IA 50171 623-5154 I ULTIMATESPORT RC 255 EnsI Ahiond/PO Boo 727/Sods Springs idoho 83276 ULIOIAIE ooo sri12085473742EoF~hd,foS,dSASE Eight X V16 X 36 12 / X Yt6 x 36 Eight /16 X x 36 Two x x 36 Two A-in sq x 36 Eight V16 x x 36 Spruce Two A-in sq x 36 Aircraft plywood x 6 x 12 /16 x 12 x 18 / x 6 x 18 Hardware pair 2/s-in Sullivan Skylite wheels Four A-in-dia wheel collars pair Goldberg A-in-dia axle assemblies set Goldberg strip aileron horn assemblies Two small nylon control horns Six 2-56 nylon clevis/rod sets 24-plus servo-mounting sheet metal screws Six 3A x 4-40 allen-head bolts blind nuts Four 3A x 2-56 allen-head bolts locknuts Du-Bro 10-32 nylon wing screw Du-Bro 10-32 brass threaded insert Two small nylon pushrod exit guides 15 small nylon pin-type hinges Du-Bro No 40 tail wheel mount assembly 3A-in tail wheel 2024-T3 x 090-in aluminum alloy appropriate commercial landing gear CB Associates 1 3A-in backplate-type plastic spinner Astro cobalt 05 15 motor system Throttle radio system choice yard 3A-oz fiberglass cloth Covering finish adhesive choice D responding advertisers mention read about Model Aviation RC Helicopters/Jolly Continued page 37 gimbaled Sony color video cam down-link TV transmitter unit super could have some definite industrial rescue applications interested project can contact Juan 415/930-0475 have also playing video-equipped RC aircraft helicopters quite challenge get everything working right comes together oh what picture have understand some great night flying Saturday night Im sorry missed attendance witness Orange County Radio Control Helicopter Association crash crew Kirk Olsen Herb Hoskins Joe Busher putting X Cell 60 back together Evidently switch harness failed during flight Saturday afternoon X-Cell proceeded fly about two minutesapparently mimicking Curtis Youngblood demonstration included inverted flight pirouettesall benefit help transmitter unleashed machine climbed high sky power-dived ground Anyway happy ending Leonard Nitro Alley opened shop crash crew able get parts needed Larry Lloyd Airtronics master radio tech local chopper maniac gave crew Quick Silver fuselage crew patiently watched everyone else fly work Sunday morning late afternoon renovated X-Cell took air flew well before mishap As side note OCRCHA crash crew would like thank Raves RC Products new molded X-Cell tail fins crash crew has completed rigorous field testing finds tail fins absolutely unbreakable through abnonnal usage also ran Gene Engelgau up Bakersfield Gene spending time Larry Lloyd field testing Lightest Pilots Available DARN GOOD AIRMEN Made USAFrom Jennies Jets Pilots Are Best Litelike Latex Rubber Build As Sportsman Barnstormer Bust Pilot KitFull Body Pilot Kit #108 118 acale.$695 #2061/6 scale.$ 995 #106 1/6 scale 205-1/5 scale.1095 #105 1/5 scale #204-1/4 scale.1195 / #104 1/4scale995 #2031/3 scale.1795 #103 1/3 scale.1595 Contains pilot head hands #308 1/8 jet695boots helmet cap goggles #307 1/7 Jet795full templates easy instructions Some simple sewing required Easy Assemble Finish 136 Model Aviation forerunner todays helicopters PCA-2 Pitcairn Autogiro operated regularly commercial firms experimentally US Navy Marines 1/48 WI LLIAMS BROS INC iei PAWNEE ST SAN MARCOS CA 92069619 744-3082 SEND $3 FOR COMPLETE COLOR CATALOG HM Catalog sioonGA DESIGNS Ordering InstructIons See dealer tirst 315 5483779135 East Main StreetDirect orders add $100 P&H NY residents add 70/0 tas FAX 315 5484099Phelps NY 14532 Ds OK
Edition: Model Aviation - 1991/09
Page Numbers: 26, 27, 28, 29, 30, 31, 32, 134, 135, 136
HERES SPORT aerobatic Electric looks like full-scale airplane performs like Gas model Tigerkitten E began take shape mind late 1988 After about year building flying Electrics watching flying others built growing tired backhanded complimentsyou know flies pretty well Electric time something about After spending several months analyzing existing Electric designs giving lot thought what really wanted new airplane began taking proven designone flight characteristics wantedand making work electric power chose Bobcat Mk2 February 1988 Model Builder Reducing models size Id have option using popular 05 motors completely reengineered structure taking advantage near-total lack vibration inherent electric power achieve significant weight reduction done changing Bobcats aerodynamic layout goal maximize performance potential readily available over-the-counter electric power systems state-of-the-art design Tigerkitten created expressly best equipment achieve good sport aerobatic performance put lot time thought finding particular combination wing area structure would offset weight penalty motor batteries currently available Performance compares favorably what experienced Gas modelers have come expect airplanes wont have make excuses model field Neither takeoff performance nor durability compromised Tigerkitten E operates restriction off surface might expect fly engine-powered model similar size achieved using somewhat greater wing area hence lower wing loading other popular models intended 05 power airplane exemplifies dictum Build fly crash Tigerkitten strong enough handle reasonable flight landing loads wasnt meant used sod hammer first prototype red-and-yellow color scheme weighs 56 oz its current power system configuration wing area 450 sq yields wing loading just under 18 oz per sq ftvery good aerobatic model size plane shows no structural deterioration after year active flying Though true love Scale entered Tigerkitten local AMA Novice Pattern competition its first contest just see what would happen As Electric field tied Gas model first place .e two Tigerkitten E prototypes after active flying session red-and-yellow model covered Sig SlIray cloth dyed Rit fab ric dye attached sealed clear nitrate dope color finish Stits Polytone full-scale aircraft paint later version uses dopefinished orange Litespan Bahama Blue Stits Polytone no fuel spills worry about planes look great cleanup Put geared Astro cobalt 15 state-of-the-art Electric add 11 x 7 prop either 12-cell 900-mAh SCR battery pack 14 SR 1000 Max cellsand go show gas-power buddies what quiet aerobatics about Dont bother make excuses Electricyou wont need ERobert Benjamin 26 Model Aviation 1990 U S Scalemasters championships Dallas privileged fly /6-scale Porterfield first modeler qualify compete using electric power see article Porterfield Collegiate April 1991 Model Aviation invited demonstrate red-and-yellow prototype during noon break three days flight judging winds never dropped below 20 mph little Kitten flew satisfying basic aerobatic routine surprising large crowd its clean silent flight despite conditions would have discouraged putting Gas models air could include videocassette copy article could see yourself difference Tigerkittens performance compared typical Electric Power systems key Tigerkittens success use very best electric power systems available cannot overemphasize youre serious about Electric flight want enjoy sort performance expect gas power owe yourself spend extra money cobalt motor system Im familiar Astro Flight line cobalt motors recommend Simply put motors will handle high current loads required fly way want fly prolonged basis deteriora tion Pay qualityand enjoy Currently have two prototypes Some minor internal refinements made second reflected plan Otherwise two structurally identical feature different color schemes power systems number prototype began life part attempt optimize performance available 05-size systems Initially used stock geared Astro cobalt 05 turning cleaned-up Rev-Up 11 x 7 prop nominal battery seven 1 200-mAh Sanyo SCR cells Performance acceptable outstanding present use nine SCR 1 200-mAh cells cleaned-up Super M 11 x 814 prop no longer market cleaned-up Rev-Up 11 /2 x 8 offers nearly same performance cut way down power loss dramatically increased rpm replacing stock power connectors Sermos connectors Astro Flight way expected shortly introduce its own low-loss September 1991 27 uui-ruu~u iup 1uw1 i mu i-veuI uu-mMn oauery P8CK TOT smro co balt 15 motor author currently experimenting 16 SR 1250 Magnum cells Ldown tail surfaces No 2 model Note elevator horn pushrod connection tail wheel assembly exit routing receiver antenna nose No 2 prototype cowl removed Stepping up Astro cobalt 05 motor used first prototype geared Astro cobalt 15 author rewarded slightly better performance Mounting dimensions 05 15 motors identical its difficult tell two installations apart close examination ulose-up -wneei ware second prototype Len left back panel cockpit locking pins removable top cowl/cockpit assembly white circles used simulate instrument panel right front panel turtledeck Note small insertion tubes cowl locking pins Right look cockpit opening/cooling air outlet shows rear rudder elevator servos arming switch Astro cobalt 15 system charging plug hidden under instrument panel radio switch connector will competitive Sermos variety perhaps less tricky use Throttle control via Jomar SM-4 optically coupled high-efficiency highrate throttle combination equipment allows effortless takeoffs somewhat rough usually wet grass off normally fly clean sequential loops level fight good Cuban eights point rolls inside square loops proper use throttle retard power cruise level between maneuvers motor throttle battery moderately warm landing Duration about five minutes-plus fly lot aerobatics six seven minutes Im just cruising around considered trade-offusing less voltage fewer cells accepting less challenging performance would increase duration Heres area ongoing improvements cell technology will make Electric flight better future After developing first prototype level realized pushed Astro 05 well beyond commonly perceived limitsalthough nearly far its capable going Moving up geared Astro cobalt 15 second blue-andorange version seemed make lot sense stock geared cobalt 15 nominal battery 12 900-mAh SCR cells APC 11 x 7 prop second prototype slightly outperforms first Im currently flying model number two same cobalt 15 running pack 14 SR 1000 Max cells new Astro Model 205 throttle control throttle well worth attention Although expensive Jomar SM-4 will handle power supplied fully self-contained ready mount making vastly easier set up install power combination turns APC 11 x 7 prop 7200 rpm flies airplane distinct authority have refrained using higher pitched props airplane number two because 11 x 7 pushing cobalt 15 its recommended sustained current level 15 amps motor designed create additional power through application higher voltage contrast 05 used first prototype designed permit higher current draw hence use higher pitched props have ralsed static current nearly 30 amps have yet reach limits either airplane-equipment combination capable being pushed writing Im experimenting battery pack 16 SR 1250 Magnum cells second prototype Thus equipped airplane weighs 62 oz wing loading 20 oz per sq ft just does nominal 12-cell 900-mAli SCR pack limitations sustained current draw SR 1250 Magnums can tolerate appears point Astro cobalt 15 might ideal motor use Performance promises spectacular Ill have leave suspense As write its November western Washington State wont stop raining Let emphasize self-described pushing power systems no way abuses Astro cobalt motors proper understanding current voltage loads motors designed judicious propeller selection proper understanding air cooling equipment use throttle rather extreme performance routinely available radio equipment both airplanes based two Airtronics Championship 7 FM transmitters updated model 92765 dual-conversion 1991 receivers Airtronics 94401 servos very lightweight radio batteries SR Batteries companys 300-mAli airborne receiver packs lightweight reliable allow use fast field charging 28 Model Aviation NO lx isni osa lanaing juax oeny view OT NO 1 proxoxype AC SHEET iMLSA llNDSHIELD PER pqrnwwL0C477N6 P/Al j*iSQ7VPSrWINGER REMOVEASLE 7DP COWLL4NNATED RUDDER TE Yipiy E1JIPI1E//T TRAYI/~ PLY TE 7XOBLER F-7 DU-ERO TAILkJitEEL ASSYLAMINA7D TIP 3/~SQ rn LONEERON /sso SIDL STR I/lEER ii iiy i/osq/iCSt UPRIGHT IJNE&---PP-FI ASTRO COBALT ogOR 75 LERVOS4kSO LOWER LONGE7ON IJITII YB%6C OUTER ClIP s* /C ci PS TRIPIJIJILr WIT/I HOT STUFF /SHEET AILERON TE OUTER COVER IN& ffSHEET SrIFFENER pq F-2 MOLDED FIBEREL4SS COWL WHEEL PINT I3RALRET0Fewr L SPAR OOLJ8ER& VAXIF ASSYIii SI/EAT SKI/I MOLDED F/BEtIiLASS WI/EEL PANT 2YiSULLIVAJI SKY-LITE WI/EEL LA If/NA TED TIP r/GE-RK/rTEN E DESIjSJIED IAN 1/V R 1/ENTAIl IN Ct I%SPINNER COOL/NC- INWKE compromising batteries After comparative testing both airplanes recommend youre already committed particular equipment consider starting off geared Astro cobalt 15 12-cell battery pack Should have geared 05 can expect about same performance nine-cell battery although gross weight will about five ounces lower duration several minutes less 12-cell/cobalt-iS combination gives honest seven- eight-minute flights suppose number higher performance ferrite motors would fly design safely remain unconvinced theyd fly well youre accomplished flier wants try Electric wont have step down performance level youre accustomed Tigerkitten E Its great way get started must take exception notion experienced flier ought start out Electric inexpensive low-powered model Such airplane may simply confirm suspicions about Electrics lack performance What could discouraging Let also emphasize Tigerkitten trainer good trainers both Gas Electric available learning fly way match power performance primary Gas trainer simply equip readymade Electric trainer recommended Astro cobalt power systems Think about Aircraft structure Electric flight Given current state development electric power systems key equaling gas-powered performance compensate weight motor battery rAS- %CUSaM AU ALVAOUR/A SaraOCVU7MC I*LAMUA SPACERS CStWJMMA C5V5/MU /ACMTSU MASSE AUEAAASMMUS U/UTh- CaUSAL ISlAM EASE/MIS proportionately light structure Several characteristics electric power make practical prevent airplanes becoming fragile Because electric power very nearly vibration-free produces no fuel exhaust residue much structure thats essential Gas models becomes redundant Electric absorb damp vibration inherent smoothest running best balanced two- four-stroke engines must include lot plywood thick balsa extra glue contribute nothing airframe strength terms resisting flight loads quarter-inch sheet balsa sides 40-size sport models good example vibration submit appropriately braced %-in %2 sheet would job perfectly well Clearly would eliminate need heavy bath epoxy inside nose just sensibly constructed Electrics problem weve become accustomed building resist vibration structure designed other way tends look suspect Closely allied trend toward using largest engine will stay attached airframe full power Little wonder Gas models have wing loadings reminiscent fat brick though theyll 30 Model Aviation vertical tail rudder completely sembled Construction begins hori zontal vertical tail surfaces laminated wing tip has completely assembled except addition short spar leading edge extension top Note lamination form still place wing structurally complete except installation aileron fuselage sides have joined balsa croaspieces tail post tormers stringers added everything rounded sanding faired rudder hor izontal tail surfaces also place 1443a034flyM34 WVWVOSWVWV WVWVWVWNW4-444 *flRASMVLMWV 344334*7FWSMg*M3LWR PLrIi I34 4M4 4M3334444-737433SacrJ34Wfr33Sf/flA 341344334337 /Sp4*34/34OWTW 443*343 4333443034*34345LI II 4a4ji34A S4-*3/554rVM/S4344433 3M 434 44*37*53434 ILIII hiIL4 -53444 *4343453333[ 433 W3334S434/ 333343334 i34 34033 34 334533433PS 34 4343445 /47 5333334/EAS43SU3443434 1 -4443/Sf434/44034435 34 333 43M 34134/3377 /3/k WuWVnrwW4o33354337*3 g-Mr 334434 4/33434343 3333 --3334334333434 44S34454 3/-I/S 4MEV344 4/444/43/Mg 3443433 AAa344WA3M713w3 4d 444/1-Ti 4LWMW4//4444/ 0 p 3WOE393 3343 0333434 *45/re rn/car34Sfl 3/3343343473433343434*/4M74K3/571334 y3/0/534 353 3303 034334333* ATWA443443434-W3343334 i)034433434M3434#434rn 44334533 M3M43 7/ rIGRKIrrEN E 33334 34CM flrcar 443433 534340 43343 Car 3 jS-We Full-Size Plans AvailableSee Page 1 88Detailed construction notes accompany lull-size plans climb straight up easily enough accustomed seeing sort thing perfectly airworthy structure designed withstand normal flight loads reasonable handling too often strikes us flimsy youve built Free Flight models already understand keep Tigerkitten light intended its important use materials appropriate dimensions Several other considerations must kept mind Wood selection critical place contest-grade balsa available better hobby shops Though its somewhat expensive garden-variety stuff itNmakes difference Goodquality balsa four- six-pound density can save six ounces total weight choice adhesive equally critical isnt time lots heavy epoxy use Hot Stuff products exclusively Both Tigerkittens built thick variety UFO cyanoacrylate CyA glue occasional shot fast-setting thin variety Independent tests have shown Hot Stuff far strongest CyAs hobby market have observed UFO formulation can eliminate problems irritation sensitive individuals youre uncomfortable using type material indeed have allergy problem try aliphatic resin insteadwork area between parts being Any adhesive intended wood does itsjoined Excessive glue squeezeout removable top cowl permits battery replacement seconds Fibergiassing cowl adds Immensely strength durability No 1 model has flown year abso lutely no problems related cowl surrounding fuselage structure September 1991 31 sign sloppy work adds excess weight would-be craftsman recommends layer glue wiped outside joint betrays ignorance principles wood aircraft construction Wet area joined thoroughly lightly glue use light clamping pressure joining parts youll job right Make fit sand some build smarter subject weight Ill give some targets aim completed wing fiberglassed hinges place servo covering/finish should weigh between five seven ounces completely finished wing airplane number two weighs 85 oz flight ready bare fuselage/tail assembly motor battery landing gear radio should weigh between six eight ounces can hit weights use appropriate covering/finish install recommended equivalent power radio equipment youll have no problems related weight Covering finishing Several options available Doubtless will choose among one-step plastic film coverings comment suggest accept slight weight penalty sake somewhat greater structural rigidity heavier films offer models structure intended rely some degree tension covering torsional rigidity lightest films wont help much personally prefer traditional approach covering finishing both opportunity exercise craftsmanship because greater strength durability properly executed fabric-and-dope finish provides type covering can shrunk tighter plastic film painted finish permanently seals locks seams Airplane number covered Sig Silray cloth dyed Rit fabric dye attached sealed clear nitrate dope color finish Stits Polytone fullscale aircraft paint part Stits Process aircraft covering finishing system Stits Polytone best stuff Ive ever seen finishing airplanes size light one-part paint excellent covering power its easy spray forgiving overspray repair fuelproof glow-power friend slops fuel airplane totally nonshrinking Think about last wish write Stits information brochure manual describing companys entire product line full-scale use both available address given end article should mention Polytone paint referred intended use over Continued page 134 32 Model Aviation basic top cowl components ready assembly view base plate has opened up sufficiently accept 05 battery packs No 1 prototype airframe structurally complete ready covering Since Tigerkittens structure relies some degree tension covering tor sional rigidity use heavier film coverings old-fashioned fabric-and-dope Bet kitten brings good luck its namesake photos Robert Benlamin high-current terminal voltage seven volts 7000 millivolts total 57 millivolts average would represent 008% loss As example 10000 rpm nominal loss associated two-pin connector set would about 16 rpm would visible three-digit tack percentage rpm loss would course smaller higher cell counts Incidentally info new connectors Since have no accumulated histoty application cant say connector performance will hold up repeated mating However have no reason expect significant deterioration normal modeling use including use charging function often exercised electrical joint separate charge jack Id like close month short story about power Im always impressed seemingly awesome power can associate Astro 60 some impressive-sounding big imported motors example 60 28-cell pack peak current condition say 30 amps over horsepower C 840 watts assuming volt per cell Certainly kilowatt in-bounds Awesome huh Well just put things perspective recently enjoyed social conversation third-year physics graduate student telling project working particular developing power supply particle accelerator power supply develops megavolt supplies megampere 60 nanoseconds say supply develops 1000000 volts delivers 1000000 amps terawatt 0000000060 seconds voltage rise time 20 nanoseconds giving slew rate about 50 mega-megavolts per second Next time youre wallowing thoughts awesome power biggest Electric reflect above kinda puts us place wouldnt ya say Incidentally can anyone guess what project uses switch wire Finally case youre wondering Electric Installations will continue future another column closes Please have happy safe Electric flying season See ya Greatest Electric Show EarthKRC D & G BALSA SAVE ON YOUR BALSA & PLYWOOD NEEDS NO MINIMUM ORDER SEND SASE FOR PRICE LIST 2422 N Marks #373 Fresno CA 93722 Ph 277-WOOD 209 277-9663 RC Tiger/Benjamin Continued page 32 Stits covering base finish products have determined purposes works very well over clear nitrate dope did use Stits Process line exactly indicated full-scale aircraft Scalemasters Porterfield excellent results Tigerkitten number two covered new product called Litespan heatshrink plastic made England Litespan imported distributed Idealair Models Charlies R/C Goodies Its available number transparent opaque colors weighs 1/ oz per sq ftlighter comparable material market Like Micafilm its applied using iron separate brushed-on adhesive unlike Micafilm Litespan paintablereally tested quite few samples before deciding use stuff Tigerkitten blue-and-orange airplane covered transparent orange Litespan finished two coats clear nitrate dope shrinks tighter heating Bahama Blue Stits Polytone white striping tape two coats clear Polytone An Electric covered Litespan added paint finish would probably hold up well advantages paint finish making covering significantly tauter adding gloss durability worth several ounces added weight custom Tigerkitten E markings both airplanes made order Vinylwrite Custom Lettering Preparing flight chosen covering finish place put everything back together certain works way want Set control throws give aileron differential about two can done either bending aileron control horns forward attaching pushrods servo output aft center use combination both purpose eliminate need 134 Model Aviation DEMOUNTABLE HINGE Demountable easy * Construction * Finishing * Repair 1/4 inch Fourmost Demountable Hinge gapless Nylon hinge allows modeler easily remove control surfaces model 1/32 inch piano wire holds hinge place Hinge may installed easily CA adhesives Hinge sold packages 12 6 inch segments sufficient span 3 feet hinge Although manufactured white Hinge may dyed painted match finish Hinge deflects plus minus 45 degrees Price 3 ft $495 Product No 141 Fourmost Products 503 357-2732 PATCHES CUSTOM AND STOCK EMBROIDERED EMBLEMS NAMEBADGES FOR CLUBS AiRCRAFT MEMORABIUA JEWELRY PINS TACKS HATS BUCKLES DESK NAMEPLATES PENSETS AND MORE SASE FOR CATALOG GENERAllON PRODUCTS CO INC 3000 KAVANAUGH SUITE B LITTLE ROCK ARKANSAS 72205 SINCE 1977 coordinating rudder aileron prevent adverse yaw turns Start about 200 up 100 down Elevator movement should 200 way rudder least 350 Once youre comfortable model may want increase movements somewhat Install battery pack move around until airplane balances point shown plan25% chord balance point airplane properly responsive controls becoming jumpy Spin entry level snap rolls positive sufficient elevator throw used recovery virtually instantaneous Ive dragged both airplanes nose-high low speed over sky having anything violent mush down speed got too low suggest test Tigerkitten E balance point decide want snappier stall maneuvers move center-of-gravity back between 30% 33% cannot overstress importance doing thorough job preflight testing entire airplane its systems Range-check motor running Use ESV expanded scale voltmeter receiver transmitter batteries beginning flying session Make absolutely certain model balanced aligned warp-free before first flight youll set years rewarding flying Flying Remember start sharp anticipate actions Let airplane build up speed fly off ground fast flat until youre sure what its going Trimmed indicated Tigerkitten E will go essentially point touch positive stability axes Dont afraid blink pay attention stay oriented airplane Tigerkittens seem fD&J ELECTRONICS 900 Lucy Road Howell Michigan 48843 517-546-2644 Service & Repairs Most Radio Control Systems Utilizing Calibrated Test Equipment & Spectrum Analyzer Endorsed AMA RCMA Sticker Station #105 Futaba Airtronics JR Ace HiTec Tower Cirrus World Engines & WE USE GENUINE FACTORY REPLACEMENT PARTS Complete 1991 Narrow Banding & Upgrades RCD / HITEC R/C DEALER Carry Full Line RCD RXs & Products Upgrading. ASK ABOUT THE NEW HOT FOCUS SERIES RADIO CONTROL SYSTEMS FCC Licensed Speed Control Repairs Quality Service Fast Turn Around Shipping & Insurance Extra. UPS Mail VISA / MASTERCARD & DISCOVER WELCOMED AMA #256123ARRLWB8YSQ prefer being brought down little fast side wheel landing attitude mains first tail wheel air rather being three-pointed Once youre ease airplane urge experiment prop/battery combinations am anxious receive input build fly design order establish wider base information power options could ever alone may well 40-size version future fine points design could depend shared experience 05-15 version Good luck think Electric Additional information Stits products available through Bobs Aircraft Supply & Avionics Attention Karen Sandberg Pierce County Airport 17017 Meridian E Puyallup WA 98373 telephone 800331-4375 206-848-9349 Canada Karen Sandberg has agreed make Stits products available direct via mail order quantities modelers use Contact about purchasing copy very complete Stits manual $15 Bill Materials Balsa sheet stock contest grade strip stock light firm 11 /16 x 3 x 36 Two Y16 x 2 x 36 x 2 x 36 4 x 2 x 36 10 Y16-sq x 36 Four A-in sq x 36 Continued page 136 September 1991 135 RENEW 2 See Card Page 99 Foo FIyingS6dac AIoo LondiogGo CIeoConopyAooIobIe B6iIde 86 1255 S6ed 831365 DeI She,d I5 1695 Satisfaction Guaranteedi EAv HINc SH-710 Pkg 24- $295 THE HIGH-TECH HINGE DESIGNED FOR THE CYANOACRYLATE AGE Easier install other hinge No gouging picking messy epoxies Simply cut single knife slot hinge slide hinges place apply few drops favorite CA glue youre done SUPER FAST SUPER EASY SUPER STRONG 7de ea 9e4 foa 6aa SIG MFG CO INC.401-7 So Front StMontezuma IA 50171 623-5154 I ULTIMATESPORT RC 255 EnsI Ahiond/PO Boo 727/Sods Springs idoho 83276 ULIOIAIE ooo sri12085473742EoF~hd,foS,dSASE Eight X V16 X 36 12 / X Yt6 x 36 Eight /16 X x 36 Two x x 36 Two A-in sq x 36 Eight V16 x x 36 Spruce Two A-in sq x 36 Aircraft plywood x 6 x 12 /16 x 12 x 18 / x 6 x 18 Hardware pair 2/s-in Sullivan Skylite wheels Four A-in-dia wheel collars pair Goldberg A-in-dia axle assemblies set Goldberg strip aileron horn assemblies Two small nylon control horns Six 2-56 nylon clevis/rod sets 24-plus servo-mounting sheet metal screws Six 3A x 4-40 allen-head bolts blind nuts Four 3A x 2-56 allen-head bolts locknuts Du-Bro 10-32 nylon wing screw Du-Bro 10-32 brass threaded insert Two small nylon pushrod exit guides 15 small nylon pin-type hinges Du-Bro No 40 tail wheel mount assembly 3A-in tail wheel 2024-T3 x 090-in aluminum alloy appropriate commercial landing gear CB Associates 1 3A-in backplate-type plastic spinner Astro cobalt 05 15 motor system Throttle radio system choice yard 3A-oz fiberglass cloth Covering finish adhesive choice D responding advertisers mention read about Model Aviation RC Helicopters/Jolly Continued page 37 gimbaled Sony color video cam down-link TV transmitter unit super could have some definite industrial rescue applications interested project can contact Juan 415/930-0475 have also playing video-equipped RC aircraft helicopters quite challenge get everything working right comes together oh what picture have understand some great night flying Saturday night Im sorry missed attendance witness Orange County Radio Control Helicopter Association crash crew Kirk Olsen Herb Hoskins Joe Busher putting X Cell 60 back together Evidently switch harness failed during flight Saturday afternoon X-Cell proceeded fly about two minutesapparently mimicking Curtis Youngblood demonstration included inverted flight pirouettesall benefit help transmitter unleashed machine climbed high sky power-dived ground Anyway happy ending Leonard Nitro Alley opened shop crash crew able get parts needed Larry Lloyd Airtronics master radio tech local chopper maniac gave crew Quick Silver fuselage crew patiently watched everyone else fly work Sunday morning late afternoon renovated X-Cell took air flew well before mishap As side note OCRCHA crash crew would like thank Raves RC Products new molded X-Cell tail fins crash crew has completed rigorous field testing finds tail fins absolutely unbreakable through abnonnal usage also ran Gene Engelgau up Bakersfield Gene spending time Larry Lloyd field testing Lightest Pilots Available DARN GOOD AIRMEN Made USAFrom Jennies Jets Pilots Are Best Litelike Latex Rubber Build As Sportsman Barnstormer Bust Pilot KitFull Body Pilot Kit #108 118 acale.$695 #2061/6 scale.$ 995 #106 1/6 scale 205-1/5 scale.1095 #105 1/5 scale #204-1/4 scale.1195 / #104 1/4scale995 #2031/3 scale.1795 #103 1/3 scale.1595 Contains pilot head hands #308 1/8 jet695boots helmet cap goggles #307 1/7 Jet795full templates easy instructions Some simple sewing required Easy Assemble Finish 136 Model Aviation forerunner todays helicopters PCA-2 Pitcairn Autogiro operated regularly commercial firms experimentally US Navy Marines 1/48 WI LLIAMS BROS INC iei PAWNEE ST SAN MARCOS CA 92069619 744-3082 SEND $3 FOR COMPLETE COLOR CATALOG HM Catalog sioonGA DESIGNS Ordering InstructIons See dealer tirst 315 5483779135 East Main StreetDirect orders add $100 P&H NY residents add 70/0 tas FAX 315 5484099Phelps NY 14532 Ds OK
Edition: Model Aviation - 1991/09
Page Numbers: 26, 27, 28, 29, 30, 31, 32, 134, 135, 136
HERES SPORT aerobatic Electric looks like full-scale airplane performs like Gas model Tigerkitten E began take shape mind late 1988 After about year building flying Electrics watching flying others built growing tired backhanded complimentsyou know flies pretty well Electric time something about After spending several months analyzing existing Electric designs giving lot thought what really wanted new airplane began taking proven designone flight characteristics wantedand making work electric power chose Bobcat Mk2 February 1988 Model Builder Reducing models size Id have option using popular 05 motors completely reengineered structure taking advantage near-total lack vibration inherent electric power achieve significant weight reduction done changing Bobcats aerodynamic layout goal maximize performance potential readily available over-the-counter electric power systems state-of-the-art design Tigerkitten created expressly best equipment achieve good sport aerobatic performance put lot time thought finding particular combination wing area structure would offset weight penalty motor batteries currently available Performance compares favorably what experienced Gas modelers have come expect airplanes wont have make excuses model field Neither takeoff performance nor durability compromised Tigerkitten E operates restriction off surface might expect fly engine-powered model similar size achieved using somewhat greater wing area hence lower wing loading other popular models intended 05 power airplane exemplifies dictum Build fly crash Tigerkitten strong enough handle reasonable flight landing loads wasnt meant used sod hammer first prototype red-and-yellow color scheme weighs 56 oz its current power system configuration wing area 450 sq yields wing loading just under 18 oz per sq ftvery good aerobatic model size plane shows no structural deterioration after year active flying Though true love Scale entered Tigerkitten local AMA Novice Pattern competition its first contest just see what would happen As Electric field tied Gas model first place .e two Tigerkitten E prototypes after active flying session red-and-yellow model covered Sig SlIray cloth dyed Rit fab ric dye attached sealed clear nitrate dope color finish Stits Polytone full-scale aircraft paint later version uses dopefinished orange Litespan Bahama Blue Stits Polytone no fuel spills worry about planes look great cleanup Put geared Astro cobalt 15 state-of-the-art Electric add 11 x 7 prop either 12-cell 900-mAh SCR battery pack 14 SR 1000 Max cellsand go show gas-power buddies what quiet aerobatics about Dont bother make excuses Electricyou wont need ERobert Benjamin 26 Model Aviation 1990 U S Scalemasters championships Dallas privileged fly /6-scale Porterfield first modeler qualify compete using electric power see article Porterfield Collegiate April 1991 Model Aviation invited demonstrate red-and-yellow prototype during noon break three days flight judging winds never dropped below 20 mph little Kitten flew satisfying basic aerobatic routine surprising large crowd its clean silent flight despite conditions would have discouraged putting Gas models air could include videocassette copy article could see yourself difference Tigerkittens performance compared typical Electric Power systems key Tigerkittens success use very best electric power systems available cannot overemphasize youre serious about Electric flight want enjoy sort performance expect gas power owe yourself spend extra money cobalt motor system Im familiar Astro Flight line cobalt motors recommend Simply put motors will handle high current loads required fly way want fly prolonged basis deteriora tion Pay qualityand enjoy Currently have two prototypes Some minor internal refinements made second reflected plan Otherwise two structurally identical feature different color schemes power systems number prototype began life part attempt optimize performance available 05-size systems Initially used stock geared Astro cobalt 05 turning cleaned-up Rev-Up 11 x 7 prop nominal battery seven 1 200-mAh Sanyo SCR cells Performance acceptable outstanding present use nine SCR 1 200-mAh cells cleaned-up Super M 11 x 814 prop no longer market cleaned-up Rev-Up 11 /2 x 8 offers nearly same performance cut way down power loss dramatically increased rpm replacing stock power connectors Sermos connectors Astro Flight way expected shortly introduce its own low-loss September 1991 27 uui-ruu~u iup 1uw1 i mu i-veuI uu-mMn oauery P8CK TOT smro co balt 15 motor author currently experimenting 16 SR 1250 Magnum cells Ldown tail surfaces No 2 model Note elevator horn pushrod connection tail wheel assembly exit routing receiver antenna nose No 2 prototype cowl removed Stepping up Astro cobalt 05 motor used first prototype geared Astro cobalt 15 author rewarded slightly better performance Mounting dimensions 05 15 motors identical its difficult tell two installations apart close examination ulose-up -wneei ware second prototype Len left back panel cockpit locking pins removable top cowl/cockpit assembly white circles used simulate instrument panel right front panel turtledeck Note small insertion tubes cowl locking pins Right look cockpit opening/cooling air outlet shows rear rudder elevator servos arming switch Astro cobalt 15 system charging plug hidden under instrument panel radio switch connector will competitive Sermos variety perhaps less tricky use Throttle control via Jomar SM-4 optically coupled high-efficiency highrate throttle combination equipment allows effortless takeoffs somewhat rough usually wet grass off normally fly clean sequential loops level fight good Cuban eights point rolls inside square loops proper use throttle retard power cruise level between maneuvers motor throttle battery moderately warm landing Duration about five minutes-plus fly lot aerobatics six seven minutes Im just cruising around considered trade-offusing less voltage fewer cells accepting less challenging performance would increase duration Heres area ongoing improvements cell technology will make Electric flight better future After developing first prototype level realized pushed Astro 05 well beyond commonly perceived limitsalthough nearly far its capable going Moving up geared Astro cobalt 15 second blue-andorange version seemed make lot sense stock geared cobalt 15 nominal battery 12 900-mAh SCR cells APC 11 x 7 prop second prototype slightly outperforms first Im currently flying model number two same cobalt 15 running pack 14 SR 1000 Max cells new Astro Model 205 throttle control throttle well worth attention Although expensive Jomar SM-4 will handle power supplied fully self-contained ready mount making vastly easier set up install power combination turns APC 11 x 7 prop 7200 rpm flies airplane distinct authority have refrained using higher pitched props airplane number two because 11 x 7 pushing cobalt 15 its recommended sustained current level 15 amps motor designed create additional power through application higher voltage contrast 05 used first prototype designed permit higher current draw hence use higher pitched props have ralsed static current nearly 30 amps have yet reach limits either airplane-equipment combination capable being pushed writing Im experimenting battery pack 16 SR 1250 Magnum cells second prototype Thus equipped airplane weighs 62 oz wing loading 20 oz per sq ft just does nominal 12-cell 900-mAli SCR pack limitations sustained current draw SR 1250 Magnums can tolerate appears point Astro cobalt 15 might ideal motor use Performance promises spectacular Ill have leave suspense As write its November western Washington State wont stop raining Let emphasize self-described pushing power systems no way abuses Astro cobalt motors proper understanding current voltage loads motors designed judicious propeller selection proper understanding air cooling equipment use throttle rather extreme performance routinely available radio equipment both airplanes based two Airtronics Championship 7 FM transmitters updated model 92765 dual-conversion 1991 receivers Airtronics 94401 servos very lightweight radio batteries SR Batteries companys 300-mAli airborne receiver packs lightweight reliable allow use fast field charging 28 Model Aviation NO lx isni osa lanaing juax oeny view OT NO 1 proxoxype AC SHEET iMLSA llNDSHIELD PER pqrnwwL0C477N6 P/Al j*iSQ7VPSrWINGER REMOVEASLE 7DP COWLL4NNATED RUDDER TE Yipiy E1JIPI1E//T TRAYI/~ PLY TE 7XOBLER F-7 DU-ERO TAILkJitEEL ASSYLAMINA7D TIP 3/~SQ rn LONEERON /sso SIDL STR I/lEER ii iiy i/osq/iCSt UPRIGHT IJNE&---PP-FI ASTRO COBALT ogOR 75 LERVOS4kSO LOWER LONGE7ON IJITII YB%6C OUTER ClIP s* /C ci PS TRIPIJIJILr WIT/I HOT STUFF /SHEET AILERON TE OUTER COVER IN& ffSHEET SrIFFENER pq F-2 MOLDED FIBEREL4SS COWL WHEEL PINT I3RALRET0Fewr L SPAR OOLJ8ER& VAXIF ASSYIii SI/EAT SKI/I MOLDED F/BEtIiLASS WI/EEL PANT 2YiSULLIVAJI SKY-LITE WI/EEL LA If/NA TED TIP r/GE-RK/rTEN E DESIjSJIED IAN 1/V R 1/ENTAIl IN Ct I%SPINNER COOL/NC- INWKE compromising batteries After comparative testing both airplanes recommend youre already committed particular equipment consider starting off geared Astro cobalt 15 12-cell battery pack Should have geared 05 can expect about same performance nine-cell battery although gross weight will about five ounces lower duration several minutes less 12-cell/cobalt-iS combination gives honest seven- eight-minute flights suppose number higher performance ferrite motors would fly design safely remain unconvinced theyd fly well youre accomplished flier wants try Electric wont have step down performance level youre accustomed Tigerkitten E Its great way get started must take exception notion experienced flier ought start out Electric inexpensive low-powered model Such airplane may simply confirm suspicions about Electrics lack performance What could discouraging Let also emphasize Tigerkitten trainer good trainers both Gas Electric available learning fly way match power performance primary Gas trainer simply equip readymade Electric trainer recommended Astro cobalt power systems Think about Aircraft structure Electric flight Given current state development electric power systems key equaling gas-powered performance compensate weight motor battery rAS- %CUSaM AU ALVAOUR/A SaraOCVU7MC I*LAMUA SPACERS CStWJMMA C5V5/MU /ACMTSU MASSE AUEAAASMMUS U/UTh- CaUSAL ISlAM EASE/MIS proportionately light structure Several characteristics electric power make practical prevent airplanes becoming fragile Because electric power very nearly vibration-free produces no fuel exhaust residue much structure thats essential Gas models becomes redundant Electric absorb damp vibration inherent smoothest running best balanced two- four-stroke engines must include lot plywood thick balsa extra glue contribute nothing airframe strength terms resisting flight loads quarter-inch sheet balsa sides 40-size sport models good example vibration submit appropriately braced %-in %2 sheet would job perfectly well Clearly would eliminate need heavy bath epoxy inside nose just sensibly constructed Electrics problem weve become accustomed building resist vibration structure designed other way tends look suspect Closely allied trend toward using largest engine will stay attached airframe full power Little wonder Gas models have wing loadings reminiscent fat brick though theyll 30 Model Aviation vertical tail rudder completely sembled Construction begins hori zontal vertical tail surfaces laminated wing tip has completely assembled except addition short spar leading edge extension top Note lamination form still place wing structurally complete except installation aileron fuselage sides have joined balsa croaspieces tail post tormers stringers added everything rounded sanding faired rudder hor izontal tail surfaces also place 1443a034flyM34 WVWVOSWVWV WVWVWVWNW4-444 *flRASMVLMWV 344334*7FWSMg*M3LWR PLrIi I34 4M4 4M3334444-737433SacrJ34Wfr33Sf/flA 341344334337 /Sp4*34/34OWTW 443*343 4333443034*34345LI II 4a4ji34A S4-*3/554rVM/S4344433 3M 434 44*37*53434 ILIII hiIL4 -53444 *4343453333[ 433 W3334S434/ 333343334 i34 34033 34 334533433PS 34 4343445 /47 5333334/EAS43SU3443434 1 -4443/Sf434/44034435 34 333 43M 34134/3377 /3/k WuWVnrwW4o33354337*3 g-Mr 334434 4/33434343 3333 --3334334333434 44S34454 3/-I/S 4MEV344 4/444/43/Mg 3443433 AAa344WA3M713w3 4d 444/1-Ti 4LWMW4//4444/ 0 p 3WOE393 3343 0333434 *45/re rn/car34Sfl 3/3343343473433343434*/4M74K3/571334 y3/0/534 353 3303 034334333* ATWA443443434-W3343334 i)034433434M3434#434rn 44334533 M3M43 7/ rIGRKIrrEN E 33334 34CM flrcar 443433 534340 43343 Car 3 jS-We Full-Size Plans AvailableSee Page 1 88Detailed construction notes accompany lull-size plans climb straight up easily enough accustomed seeing sort thing perfectly airworthy structure designed withstand normal flight loads reasonable handling too often strikes us flimsy youve built Free Flight models already understand keep Tigerkitten light intended its important use materials appropriate dimensions Several other considerations must kept mind Wood selection critical place contest-grade balsa available better hobby shops Though its somewhat expensive garden-variety stuff itNmakes difference Goodquality balsa four- six-pound density can save six ounces total weight choice adhesive equally critical isnt time lots heavy epoxy use Hot Stuff products exclusively Both Tigerkittens built thick variety UFO cyanoacrylate CyA glue occasional shot fast-setting thin variety Independent tests have shown Hot Stuff far strongest CyAs hobby market have observed UFO formulation can eliminate problems irritation sensitive individuals youre uncomfortable using type material indeed have allergy problem try aliphatic resin insteadwork area between parts being Any adhesive intended wood does itsjoined Excessive glue squeezeout removable top cowl permits battery replacement seconds Fibergiassing cowl adds Immensely strength durability No 1 model has flown year abso lutely no problems related cowl surrounding fuselage structure September 1991 31 sign sloppy work adds excess weight would-be craftsman recommends layer glue wiped outside joint betrays ignorance principles wood aircraft construction Wet area joined thoroughly lightly glue use light clamping pressure joining parts youll job right Make fit sand some build smarter subject weight Ill give some targets aim completed wing fiberglassed hinges place servo covering/finish should weigh between five seven ounces completely finished wing airplane number two weighs 85 oz flight ready bare fuselage/tail assembly motor battery landing gear radio should weigh between six eight ounces can hit weights use appropriate covering/finish install recommended equivalent power radio equipment youll have no problems related weight Covering finishing Several options available Doubtless will choose among one-step plastic film coverings comment suggest accept slight weight penalty sake somewhat greater structural rigidity heavier films offer models structure intended rely some degree tension covering torsional rigidity lightest films wont help much personally prefer traditional approach covering finishing both opportunity exercise craftsmanship because greater strength durability properly executed fabric-and-dope finish provides type covering can shrunk tighter plastic film painted finish permanently seals locks seams Airplane number covered Sig Silray cloth dyed Rit fabric dye attached sealed clear nitrate dope color finish Stits Polytone fullscale aircraft paint part Stits Process aircraft covering finishing system Stits Polytone best stuff Ive ever seen finishing airplanes size light one-part paint excellent covering power its easy spray forgiving overspray repair fuelproof glow-power friend slops fuel airplane totally nonshrinking Think about last wish write Stits information brochure manual describing companys entire product line full-scale use both available address given end article should mention Polytone paint referred intended use over Continued page 134 32 Model Aviation basic top cowl components ready assembly view base plate has opened up sufficiently accept 05 battery packs No 1 prototype airframe structurally complete ready covering Since Tigerkittens structure relies some degree tension covering tor sional rigidity use heavier film coverings old-fashioned fabric-and-dope Bet kitten brings good luck its namesake photos Robert Benlamin high-current terminal voltage seven volts 7000 millivolts total 57 millivolts average would represent 008% loss As example 10000 rpm nominal loss associated two-pin connector set would about 16 rpm would visible three-digit tack percentage rpm loss would course smaller higher cell counts Incidentally info new connectors Since have no accumulated histoty application cant say connector performance will hold up repeated mating However have no reason expect significant deterioration normal modeling use including use charging function often exercised electrical joint separate charge jack Id like close month short story about power Im always impressed seemingly awesome power can associate Astro 60 some impressive-sounding big imported motors example 60 28-cell pack peak current condition say 30 amps over horsepower C 840 watts assuming volt per cell Certainly kilowatt in-bounds Awesome huh Well just put things perspective recently enjoyed social conversation third-year physics graduate student telling project working particular developing power supply particle accelerator power supply develops megavolt supplies megampere 60 nanoseconds say supply develops 1000000 volts delivers 1000000 amps terawatt 0000000060 seconds voltage rise time 20 nanoseconds giving slew rate about 50 mega-megavolts per second Next time youre wallowing thoughts awesome power biggest Electric reflect above kinda puts us place wouldnt ya say Incidentally can anyone guess what project uses switch wire Finally case youre wondering Electric Installations will continue future another column closes Please have happy safe Electric flying season See ya Greatest Electric Show EarthKRC D & G BALSA SAVE ON YOUR BALSA & PLYWOOD NEEDS NO MINIMUM ORDER SEND SASE FOR PRICE LIST 2422 N Marks #373 Fresno CA 93722 Ph 277-WOOD 209 277-9663 RC Tiger/Benjamin Continued page 32 Stits covering base finish products have determined purposes works very well over clear nitrate dope did use Stits Process line exactly indicated full-scale aircraft Scalemasters Porterfield excellent results Tigerkitten number two covered new product called Litespan heatshrink plastic made England Litespan imported distributed Idealair Models Charlies R/C Goodies Its available number transparent opaque colors weighs 1/ oz per sq ftlighter comparable material market Like Micafilm its applied using iron separate brushed-on adhesive unlike Micafilm Litespan paintablereally tested quite few samples before deciding use stuff Tigerkitten blue-and-orange airplane covered transparent orange Litespan finished two coats clear nitrate dope shrinks tighter heating Bahama Blue Stits Polytone white striping tape two coats clear Polytone An Electric covered Litespan added paint finish would probably hold up well advantages paint finish making covering significantly tauter adding gloss durability worth several ounces added weight custom Tigerkitten E markings both airplanes made order Vinylwrite Custom Lettering Preparing flight chosen covering finish place put everything back together certain works way want Set control throws give aileron differential about two can done either bending aileron control horns forward attaching pushrods servo output aft center use combination both purpose eliminate need 134 Model Aviation DEMOUNTABLE HINGE Demountable easy * Construction * Finishing * Repair 1/4 inch Fourmost Demountable Hinge gapless Nylon hinge allows modeler easily remove control surfaces model 1/32 inch piano wire holds hinge place Hinge may installed easily CA adhesives Hinge sold packages 12 6 inch segments sufficient span 3 feet hinge Although manufactured white Hinge may dyed painted match finish Hinge deflects plus minus 45 degrees Price 3 ft $495 Product No 141 Fourmost Products 503 357-2732 PATCHES CUSTOM AND STOCK EMBROIDERED EMBLEMS NAMEBADGES FOR CLUBS AiRCRAFT MEMORABIUA JEWELRY PINS TACKS HATS BUCKLES DESK NAMEPLATES PENSETS AND MORE SASE FOR CATALOG GENERAllON PRODUCTS CO INC 3000 KAVANAUGH SUITE B LITTLE ROCK ARKANSAS 72205 SINCE 1977 coordinating rudder aileron prevent adverse yaw turns Start about 200 up 100 down Elevator movement should 200 way rudder least 350 Once youre comfortable model may want increase movements somewhat Install battery pack move around until airplane balances point shown plan25% chord balance point airplane properly responsive controls becoming jumpy Spin entry level snap rolls positive sufficient elevator throw used recovery virtually instantaneous Ive dragged both airplanes nose-high low speed over sky having anything violent mush down speed got too low suggest test Tigerkitten E balance point decide want snappier stall maneuvers move center-of-gravity back between 30% 33% cannot overstress importance doing thorough job preflight testing entire airplane its systems Range-check motor running Use ESV expanded scale voltmeter receiver transmitter batteries beginning flying session Make absolutely certain model balanced aligned warp-free before first flight youll set years rewarding flying Flying Remember start sharp anticipate actions Let airplane build up speed fly off ground fast flat until youre sure what its going Trimmed indicated Tigerkitten E will go essentially point touch positive stability axes Dont afraid blink pay attention stay oriented airplane Tigerkittens seem fD&J ELECTRONICS 900 Lucy Road Howell Michigan 48843 517-546-2644 Service & Repairs Most Radio Control Systems Utilizing Calibrated Test Equipment & Spectrum Analyzer Endorsed AMA RCMA Sticker Station #105 Futaba Airtronics JR Ace HiTec Tower Cirrus World Engines & WE USE GENUINE FACTORY REPLACEMENT PARTS Complete 1991 Narrow Banding & Upgrades RCD / HITEC R/C DEALER Carry Full Line RCD RXs & Products Upgrading. ASK ABOUT THE NEW HOT FOCUS SERIES RADIO CONTROL SYSTEMS FCC Licensed Speed Control Repairs Quality Service Fast Turn Around Shipping & Insurance Extra. UPS Mail VISA / MASTERCARD & DISCOVER WELCOMED AMA #256123ARRLWB8YSQ prefer being brought down little fast side wheel landing attitude mains first tail wheel air rather being three-pointed Once youre ease airplane urge experiment prop/battery combinations am anxious receive input build fly design order establish wider base information power options could ever alone may well 40-size version future fine points design could depend shared experience 05-15 version Good luck think Electric Additional information Stits products available through Bobs Aircraft Supply & Avionics Attention Karen Sandberg Pierce County Airport 17017 Meridian E Puyallup WA 98373 telephone 800331-4375 206-848-9349 Canada Karen Sandberg has agreed make Stits products available direct via mail order quantities modelers use Contact about purchasing copy very complete Stits manual $15 Bill Materials Balsa sheet stock contest grade strip stock light firm 11 /16 x 3 x 36 Two Y16 x 2 x 36 x 2 x 36 4 x 2 x 36 10 Y16-sq x 36 Four A-in sq x 36 Continued page 136 September 1991 135 RENEW 2 See Card Page 99 Foo FIyingS6dac AIoo LondiogGo CIeoConopyAooIobIe B6iIde 86 1255 S6ed 831365 DeI She,d I5 1695 Satisfaction Guaranteedi EAv HINc SH-710 Pkg 24- $295 THE HIGH-TECH HINGE DESIGNED FOR THE CYANOACRYLATE AGE Easier install other hinge No gouging picking messy epoxies Simply cut single knife slot hinge slide hinges place apply few drops favorite CA glue youre done SUPER FAST SUPER EASY SUPER STRONG 7de ea 9e4 foa 6aa SIG MFG CO INC.401-7 So Front StMontezuma IA 50171 623-5154 I ULTIMATESPORT RC 255 EnsI Ahiond/PO Boo 727/Sods Springs idoho 83276 ULIOIAIE ooo sri12085473742EoF~hd,foS,dSASE Eight X V16 X 36 12 / X Yt6 x 36 Eight /16 X x 36 Two x x 36 Two A-in sq x 36 Eight V16 x x 36 Spruce Two A-in sq x 36 Aircraft plywood x 6 x 12 /16 x 12 x 18 / x 6 x 18 Hardware pair 2/s-in Sullivan Skylite wheels Four A-in-dia wheel collars pair Goldberg A-in-dia axle assemblies set Goldberg strip aileron horn assemblies Two small nylon control horns Six 2-56 nylon clevis/rod sets 24-plus servo-mounting sheet metal screws Six 3A x 4-40 allen-head bolts blind nuts Four 3A x 2-56 allen-head bolts locknuts Du-Bro 10-32 nylon wing screw Du-Bro 10-32 brass threaded insert Two small nylon pushrod exit guides 15 small nylon pin-type hinges Du-Bro No 40 tail wheel mount assembly 3A-in tail wheel 2024-T3 x 090-in aluminum alloy appropriate commercial landing gear CB Associates 1 3A-in backplate-type plastic spinner Astro cobalt 05 15 motor system Throttle radio system choice yard 3A-oz fiberglass cloth Covering finish adhesive choice D responding advertisers mention read about Model Aviation RC Helicopters/Jolly Continued page 37 gimbaled Sony color video cam down-link TV transmitter unit super could have some definite industrial rescue applications interested project can contact Juan 415/930-0475 have also playing video-equipped RC aircraft helicopters quite challenge get everything working right comes together oh what picture have understand some great night flying Saturday night Im sorry missed attendance witness Orange County Radio Control Helicopter Association crash crew Kirk Olsen Herb Hoskins Joe Busher putting X Cell 60 back together Evidently switch harness failed during flight Saturday afternoon X-Cell proceeded fly about two minutesapparently mimicking Curtis Youngblood demonstration included inverted flight pirouettesall benefit help transmitter unleashed machine climbed high sky power-dived ground Anyway happy ending Leonard Nitro Alley opened shop crash crew able get parts needed Larry Lloyd Airtronics master radio tech local chopper maniac gave crew Quick Silver fuselage crew patiently watched everyone else fly work Sunday morning late afternoon renovated X-Cell took air flew well before mishap As side note OCRCHA crash crew would like thank Raves RC Products new molded X-Cell tail fins crash crew has completed rigorous field testing finds tail fins absolutely unbreakable through abnonnal usage also ran Gene Engelgau up Bakersfield Gene spending time Larry Lloyd field testing Lightest Pilots Available DARN GOOD AIRMEN Made USAFrom Jennies Jets Pilots Are Best Litelike Latex Rubber Build As Sportsman Barnstormer Bust Pilot KitFull Body Pilot Kit #108 118 acale.$695 #2061/6 scale.$ 995 #106 1/6 scale 205-1/5 scale.1095 #105 1/5 scale #204-1/4 scale.1195 / #104 1/4scale995 #2031/3 scale.1795 #103 1/3 scale.1595 Contains pilot head hands #308 1/8 jet695boots helmet cap goggles #307 1/7 Jet795full templates easy instructions Some simple sewing required Easy Assemble Finish 136 Model Aviation forerunner todays helicopters PCA-2 Pitcairn Autogiro operated regularly commercial firms experimentally US Navy Marines 1/48 WI LLIAMS BROS INC iei PAWNEE ST SAN MARCOS CA 92069619 744-3082 SEND $3 FOR COMPLETE COLOR CATALOG HM Catalog sioonGA DESIGNS Ordering InstructIons See dealer tirst 315 5483779135 East Main StreetDirect orders add $100 P&H NY residents add 70/0 tas FAX 315 5484099Phelps NY 14532 Ds OK
Edition: Model Aviation - 1991/09
Page Numbers: 26, 27, 28, 29, 30, 31, 32, 134, 135, 136
HERES SPORT aerobatic Electric looks like full-scale airplane performs like Gas model Tigerkitten E began take shape mind late 1988 After about year building flying Electrics watching flying others built growing tired backhanded complimentsyou know flies pretty well Electric time something about After spending several months analyzing existing Electric designs giving lot thought what really wanted new airplane began taking proven designone flight characteristics wantedand making work electric power chose Bobcat Mk2 February 1988 Model Builder Reducing models size Id have option using popular 05 motors completely reengineered structure taking advantage near-total lack vibration inherent electric power achieve significant weight reduction done changing Bobcats aerodynamic layout goal maximize performance potential readily available over-the-counter electric power systems state-of-the-art design Tigerkitten created expressly best equipment achieve good sport aerobatic performance put lot time thought finding particular combination wing area structure would offset weight penalty motor batteries currently available Performance compares favorably what experienced Gas modelers have come expect airplanes wont have make excuses model field Neither takeoff performance nor durability compromised Tigerkitten E operates restriction off surface might expect fly engine-powered model similar size achieved using somewhat greater wing area hence lower wing loading other popular models intended 05 power airplane exemplifies dictum Build fly crash Tigerkitten strong enough handle reasonable flight landing loads wasnt meant used sod hammer first prototype red-and-yellow color scheme weighs 56 oz its current power system configuration wing area 450 sq yields wing loading just under 18 oz per sq ftvery good aerobatic model size plane shows no structural deterioration after year active flying Though true love Scale entered Tigerkitten local AMA Novice Pattern competition its first contest just see what would happen As Electric field tied Gas model first place .e two Tigerkitten E prototypes after active flying session red-and-yellow model covered Sig SlIray cloth dyed Rit fab ric dye attached sealed clear nitrate dope color finish Stits Polytone full-scale aircraft paint later version uses dopefinished orange Litespan Bahama Blue Stits Polytone no fuel spills worry about planes look great cleanup Put geared Astro cobalt 15 state-of-the-art Electric add 11 x 7 prop either 12-cell 900-mAh SCR battery pack 14 SR 1000 Max cellsand go show gas-power buddies what quiet aerobatics about Dont bother make excuses Electricyou wont need ERobert Benjamin 26 Model Aviation 1990 U S Scalemasters championships Dallas privileged fly /6-scale Porterfield first modeler qualify compete using electric power see article Porterfield Collegiate April 1991 Model Aviation invited demonstrate red-and-yellow prototype during noon break three days flight judging winds never dropped below 20 mph little Kitten flew satisfying basic aerobatic routine surprising large crowd its clean silent flight despite conditions would have discouraged putting Gas models air could include videocassette copy article could see yourself difference Tigerkittens performance compared typical Electric Power systems key Tigerkittens success use very best electric power systems available cannot overemphasize youre serious about Electric flight want enjoy sort performance expect gas power owe yourself spend extra money cobalt motor system Im familiar Astro Flight line cobalt motors recommend Simply put motors will handle high current loads required fly way want fly prolonged basis deteriora tion Pay qualityand enjoy Currently have two prototypes Some minor internal refinements made second reflected plan Otherwise two structurally identical feature different color schemes power systems number prototype began life part attempt optimize performance available 05-size systems Initially used stock geared Astro cobalt 05 turning cleaned-up Rev-Up 11 x 7 prop nominal battery seven 1 200-mAh Sanyo SCR cells Performance acceptable outstanding present use nine SCR 1 200-mAh cells cleaned-up Super M 11 x 814 prop no longer market cleaned-up Rev-Up 11 /2 x 8 offers nearly same performance cut way down power loss dramatically increased rpm replacing stock power connectors Sermos connectors Astro Flight way expected shortly introduce its own low-loss September 1991 27 uui-ruu~u iup 1uw1 i mu i-veuI uu-mMn oauery P8CK TOT smro co balt 15 motor author currently experimenting 16 SR 1250 Magnum cells Ldown tail surfaces No 2 model Note elevator horn pushrod connection tail wheel assembly exit routing receiver antenna nose No 2 prototype cowl removed Stepping up Astro cobalt 05 motor used first prototype geared Astro cobalt 15 author rewarded slightly better performance Mounting dimensions 05 15 motors identical its difficult tell two installations apart close examination ulose-up -wneei ware second prototype Len left back panel cockpit locking pins removable top cowl/cockpit assembly white circles used simulate instrument panel right front panel turtledeck Note small insertion tubes cowl locking pins Right look cockpit opening/cooling air outlet shows rear rudder elevator servos arming switch Astro cobalt 15 system charging plug hidden under instrument panel radio switch connector will competitive Sermos variety perhaps less tricky use Throttle control via Jomar SM-4 optically coupled high-efficiency highrate throttle combination equipment allows effortless takeoffs somewhat rough usually wet grass off normally fly clean sequential loops level fight good Cuban eights point rolls inside square loops proper use throttle retard power cruise level between maneuvers motor throttle battery moderately warm landing Duration about five minutes-plus fly lot aerobatics six seven minutes Im just cruising around considered trade-offusing less voltage fewer cells accepting less challenging performance would increase duration Heres area ongoing improvements cell technology will make Electric flight better future After developing first prototype level realized pushed Astro 05 well beyond commonly perceived limitsalthough nearly far its capable going Moving up geared Astro cobalt 15 second blue-andorange version seemed make lot sense stock geared cobalt 15 nominal battery 12 900-mAh SCR cells APC 11 x 7 prop second prototype slightly outperforms first Im currently flying model number two same cobalt 15 running pack 14 SR 1000 Max cells new Astro Model 205 throttle control throttle well worth attention Although expensive Jomar SM-4 will handle power supplied fully self-contained ready mount making vastly easier set up install power combination turns APC 11 x 7 prop 7200 rpm flies airplane distinct authority have refrained using higher pitched props airplane number two because 11 x 7 pushing cobalt 15 its recommended sustained current level 15 amps motor designed create additional power through application higher voltage contrast 05 used first prototype designed permit higher current draw hence use higher pitched props have ralsed static current nearly 30 amps have yet reach limits either airplane-equipment combination capable being pushed writing Im experimenting battery pack 16 SR 1250 Magnum cells second prototype Thus equipped airplane weighs 62 oz wing loading 20 oz per sq ft just does nominal 12-cell 900-mAli SCR pack limitations sustained current draw SR 1250 Magnums can tolerate appears point Astro cobalt 15 might ideal motor use Performance promises spectacular Ill have leave suspense As write its November western Washington State wont stop raining Let emphasize self-described pushing power systems no way abuses Astro cobalt motors proper understanding current voltage loads motors designed judicious propeller selection proper understanding air cooling equipment use throttle rather extreme performance routinely available radio equipment both airplanes based two Airtronics Championship 7 FM transmitters updated model 92765 dual-conversion 1991 receivers Airtronics 94401 servos very lightweight radio batteries SR Batteries companys 300-mAli airborne receiver packs lightweight reliable allow use fast field charging 28 Model Aviation NO lx isni osa lanaing juax oeny view OT NO 1 proxoxype AC SHEET iMLSA llNDSHIELD PER pqrnwwL0C477N6 P/Al j*iSQ7VPSrWINGER REMOVEASLE 7DP COWLL4NNATED RUDDER TE Yipiy E1JIPI1E//T TRAYI/~ PLY TE 7XOBLER F-7 DU-ERO TAILkJitEEL ASSYLAMINA7D TIP 3/~SQ rn LONEERON /sso SIDL STR I/lEER ii iiy i/osq/iCSt UPRIGHT IJNE&---PP-FI ASTRO COBALT ogOR 75 LERVOS4kSO LOWER LONGE7ON IJITII YB%6C OUTER ClIP s* /C ci PS TRIPIJIJILr WIT/I HOT STUFF /SHEET AILERON TE OUTER COVER IN& ffSHEET SrIFFENER pq F-2 MOLDED FIBEREL4SS COWL WHEEL PINT I3RALRET0Fewr L SPAR OOLJ8ER& VAXIF ASSYIii SI/EAT SKI/I MOLDED F/BEtIiLASS WI/EEL PANT 2YiSULLIVAJI SKY-LITE WI/EEL LA If/NA TED TIP r/GE-RK/rTEN E DESIjSJIED IAN 1/V R 1/ENTAIl IN Ct I%SPINNER COOL/NC- INWKE compromising batteries After comparative testing both airplanes recommend youre already committed particular equipment consider starting off geared Astro cobalt 15 12-cell battery pack Should have geared 05 can expect about same performance nine-cell battery although gross weight will about five ounces lower duration several minutes less 12-cell/cobalt-iS combination gives honest seven- eight-minute flights suppose number higher performance ferrite motors would fly design safely remain unconvinced theyd fly well youre accomplished flier wants try Electric wont have step down performance level youre accustomed Tigerkitten E Its great way get started must take exception notion experienced flier ought start out Electric inexpensive low-powered model Such airplane may simply confirm suspicions about Electrics lack performance What could discouraging Let also emphasize Tigerkitten trainer good trainers both Gas Electric available learning fly way match power performance primary Gas trainer simply equip readymade Electric trainer recommended Astro cobalt power systems Think about Aircraft structure Electric flight Given current state development electric power systems key equaling gas-powered performance compensate weight motor battery rAS- %CUSaM AU ALVAOUR/A SaraOCVU7MC I*LAMUA SPACERS CStWJMMA C5V5/MU /ACMTSU MASSE AUEAAASMMUS U/UTh- CaUSAL ISlAM EASE/MIS proportionately light structure Several characteristics electric power make practical prevent airplanes becoming fragile Because electric power very nearly vibration-free produces no fuel exhaust residue much structure thats essential Gas models becomes redundant Electric absorb damp vibration inherent smoothest running best balanced two- four-stroke engines must include lot plywood thick balsa extra glue contribute nothing airframe strength terms resisting flight loads quarter-inch sheet balsa sides 40-size sport models good example vibration submit appropriately braced %-in %2 sheet would job perfectly well Clearly would eliminate need heavy bath epoxy inside nose just sensibly constructed Electrics problem weve become accustomed building resist vibration structure designed other way tends look suspect Closely allied trend toward using largest engine will stay attached airframe full power Little wonder Gas models have wing loadings reminiscent fat brick though theyll 30 Model Aviation vertical tail rudder completely sembled Construction begins hori zontal vertical tail surfaces laminated wing tip has completely assembled except addition short spar leading edge extension top Note lamination form still place wing structurally complete except installation aileron fuselage sides have joined balsa croaspieces tail post tormers stringers added everything rounded sanding faired rudder hor izontal tail surfaces also place 1443a034flyM34 WVWVOSWVWV WVWVWVWNW4-444 *flRASMVLMWV 344334*7FWSMg*M3LWR PLrIi I34 4M4 4M3334444-737433SacrJ34Wfr33Sf/flA 341344334337 /Sp4*34/34OWTW 443*343 4333443034*34345LI II 4a4ji34A S4-*3/554rVM/S4344433 3M 434 44*37*53434 ILIII hiIL4 -53444 *4343453333[ 433 W3334S434/ 333343334 i34 34033 34 334533433PS 34 4343445 /47 5333334/EAS43SU3443434 1 -4443/Sf434/44034435 34 333 43M 34134/3377 /3/k WuWVnrwW4o33354337*3 g-Mr 334434 4/33434343 3333 --3334334333434 44S34454 3/-I/S 4MEV344 4/444/43/Mg 3443433 AAa344WA3M713w3 4d 444/1-Ti 4LWMW4//4444/ 0 p 3WOE393 3343 0333434 *45/re rn/car34Sfl 3/3343343473433343434*/4M74K3/571334 y3/0/534 353 3303 034334333* ATWA443443434-W3343334 i)034433434M3434#434rn 44334533 M3M43 7/ rIGRKIrrEN E 33334 34CM flrcar 443433 534340 43343 Car 3 jS-We Full-Size Plans AvailableSee Page 1 88Detailed construction notes accompany lull-size plans climb straight up easily enough accustomed seeing sort thing perfectly airworthy structure designed withstand normal flight loads reasonable handling too often strikes us flimsy youve built Free Flight models already understand keep Tigerkitten light intended its important use materials appropriate dimensions Several other considerations must kept mind Wood selection critical place contest-grade balsa available better hobby shops Though its somewhat expensive garden-variety stuff itNmakes difference Goodquality balsa four- six-pound density can save six ounces total weight choice adhesive equally critical isnt time lots heavy epoxy use Hot Stuff products exclusively Both Tigerkittens built thick variety UFO cyanoacrylate CyA glue occasional shot fast-setting thin variety Independent tests have shown Hot Stuff far strongest CyAs hobby market have observed UFO formulation can eliminate problems irritation sensitive individuals youre uncomfortable using type material indeed have allergy problem try aliphatic resin insteadwork area between parts being Any adhesive intended wood does itsjoined Excessive glue squeezeout removable top cowl permits battery replacement seconds Fibergiassing cowl adds Immensely strength durability No 1 model has flown year abso lutely no problems related cowl surrounding fuselage structure September 1991 31 sign sloppy work adds excess weight would-be craftsman recommends layer glue wiped outside joint betrays ignorance principles wood aircraft construction Wet area joined thoroughly lightly glue use light clamping pressure joining parts youll job right Make fit sand some build smarter subject weight Ill give some targets aim completed wing fiberglassed hinges place servo covering/finish should weigh between five seven ounces completely finished wing airplane number two weighs 85 oz flight ready bare fuselage/tail assembly motor battery landing gear radio should weigh between six eight ounces can hit weights use appropriate covering/finish install recommended equivalent power radio equipment youll have no problems related weight Covering finishing Several options available Doubtless will choose among one-step plastic film coverings comment suggest accept slight weight penalty sake somewhat greater structural rigidity heavier films offer models structure intended rely some degree tension covering torsional rigidity lightest films wont help much personally prefer traditional approach covering finishing both opportunity exercise craftsmanship because greater strength durability properly executed fabric-and-dope finish provides type covering can shrunk tighter plastic film painted finish permanently seals locks seams Airplane number covered Sig Silray cloth dyed Rit fabric dye attached sealed clear nitrate dope color finish Stits Polytone fullscale aircraft paint part Stits Process aircraft covering finishing system Stits Polytone best stuff Ive ever seen finishing airplanes size light one-part paint excellent covering power its easy spray forgiving overspray repair fuelproof glow-power friend slops fuel airplane totally nonshrinking Think about last wish write Stits information brochure manual describing companys entire product line full-scale use both available address given end article should mention Polytone paint referred intended use over Continued page 134 32 Model Aviation basic top cowl components ready assembly view base plate has opened up sufficiently accept 05 battery packs No 1 prototype airframe structurally complete ready covering Since Tigerkittens structure relies some degree tension covering tor sional rigidity use heavier film coverings old-fashioned fabric-and-dope Bet kitten brings good luck its namesake photos Robert Benlamin high-current terminal voltage seven volts 7000 millivolts total 57 millivolts average would represent 008% loss As example 10000 rpm nominal loss associated two-pin connector set would about 16 rpm would visible three-digit tack percentage rpm loss would course smaller higher cell counts Incidentally info new connectors Since have no accumulated histoty application cant say connector performance will hold up repeated mating However have no reason expect significant deterioration normal modeling use including use charging function often exercised electrical joint separate charge jack Id like close month short story about power Im always impressed seemingly awesome power can associate Astro 60 some impressive-sounding big imported motors example 60 28-cell pack peak current condition say 30 amps over horsepower C 840 watts assuming volt per cell Certainly kilowatt in-bounds Awesome huh Well just put things perspective recently enjoyed social conversation third-year physics graduate student telling project working particular developing power supply particle accelerator power supply develops megavolt supplies megampere 60 nanoseconds say supply develops 1000000 volts delivers 1000000 amps terawatt 0000000060 seconds voltage rise time 20 nanoseconds giving slew rate about 50 mega-megavolts per second Next time youre wallowing thoughts awesome power biggest Electric reflect above kinda puts us place wouldnt ya say Incidentally can anyone guess what project uses switch wire Finally case youre wondering Electric Installations will continue future another column closes Please have happy safe Electric flying season See ya Greatest Electric Show EarthKRC D & G BALSA SAVE ON YOUR BALSA & PLYWOOD NEEDS NO MINIMUM ORDER SEND SASE FOR PRICE LIST 2422 N Marks #373 Fresno CA 93722 Ph 277-WOOD 209 277-9663 RC Tiger/Benjamin Continued page 32 Stits covering base finish products have determined purposes works very well over clear nitrate dope did use Stits Process line exactly indicated full-scale aircraft Scalemasters Porterfield excellent results Tigerkitten number two covered new product called Litespan heatshrink plastic made England Litespan imported distributed Idealair Models Charlies R/C Goodies Its available number transparent opaque colors weighs 1/ oz per sq ftlighter comparable material market Like Micafilm its applied using iron separate brushed-on adhesive unlike Micafilm Litespan paintablereally tested quite few samples before deciding use stuff Tigerkitten blue-and-orange airplane covered transparent orange Litespan finished two coats clear nitrate dope shrinks tighter heating Bahama Blue Stits Polytone white striping tape two coats clear Polytone An Electric covered Litespan added paint finish would probably hold up well advantages paint finish making covering significantly tauter adding gloss durability worth several ounces added weight custom Tigerkitten E markings both airplanes made order Vinylwrite Custom Lettering Preparing flight chosen covering finish place put everything back together certain works way want Set control throws give aileron differential about two can done either bending aileron control horns forward attaching pushrods servo output aft center use combination both purpose eliminate need 134 Model Aviation DEMOUNTABLE HINGE Demountable easy * Construction * Finishing * Repair 1/4 inch Fourmost Demountable Hinge gapless Nylon hinge allows modeler easily remove control surfaces model 1/32 inch piano wire holds hinge place Hinge may installed easily CA adhesives Hinge sold packages 12 6 inch segments sufficient span 3 feet hinge Although manufactured white Hinge may dyed painted match finish Hinge deflects plus minus 45 degrees Price 3 ft $495 Product No 141 Fourmost Products 503 357-2732 PATCHES CUSTOM AND STOCK EMBROIDERED EMBLEMS NAMEBADGES FOR CLUBS AiRCRAFT MEMORABIUA JEWELRY PINS TACKS HATS BUCKLES DESK NAMEPLATES PENSETS AND MORE SASE FOR CATALOG GENERAllON PRODUCTS CO INC 3000 KAVANAUGH SUITE B LITTLE ROCK ARKANSAS 72205 SINCE 1977 coordinating rudder aileron prevent adverse yaw turns Start about 200 up 100 down Elevator movement should 200 way rudder least 350 Once youre comfortable model may want increase movements somewhat Install battery pack move around until airplane balances point shown plan25% chord balance point airplane properly responsive controls becoming jumpy Spin entry level snap rolls positive sufficient elevator throw used recovery virtually instantaneous Ive dragged both airplanes nose-high low speed over sky having anything violent mush down speed got too low suggest test Tigerkitten E balance point decide want snappier stall maneuvers move center-of-gravity back between 30% 33% cannot overstress importance doing thorough job preflight testing entire airplane its systems Range-check motor running Use ESV expanded scale voltmeter receiver transmitter batteries beginning flying session Make absolutely certain model balanced aligned warp-free before first flight youll set years rewarding flying Flying Remember start sharp anticipate actions Let airplane build up speed fly off ground fast flat until youre sure what its going Trimmed indicated Tigerkitten E will go essentially point touch positive stability axes Dont afraid blink pay attention stay oriented airplane Tigerkittens seem fD&J ELECTRONICS 900 Lucy Road Howell Michigan 48843 517-546-2644 Service & Repairs Most Radio Control Systems Utilizing Calibrated Test Equipment & Spectrum Analyzer Endorsed AMA RCMA Sticker Station #105 Futaba Airtronics JR Ace HiTec Tower Cirrus World Engines & WE USE GENUINE FACTORY REPLACEMENT PARTS Complete 1991 Narrow Banding & Upgrades RCD / HITEC R/C DEALER Carry Full Line RCD RXs & Products Upgrading. ASK ABOUT THE NEW HOT FOCUS SERIES RADIO CONTROL SYSTEMS FCC Licensed Speed Control Repairs Quality Service Fast Turn Around Shipping & Insurance Extra. UPS Mail VISA / MASTERCARD & DISCOVER WELCOMED AMA #256123ARRLWB8YSQ prefer being brought down little fast side wheel landing attitude mains first tail wheel air rather being three-pointed Once youre ease airplane urge experiment prop/battery combinations am anxious receive input build fly design order establish wider base information power options could ever alone may well 40-size version future fine points design could depend shared experience 05-15 version Good luck think Electric Additional information Stits products available through Bobs Aircraft Supply & Avionics Attention Karen Sandberg Pierce County Airport 17017 Meridian E Puyallup WA 98373 telephone 800331-4375 206-848-9349 Canada Karen Sandberg has agreed make Stits products available direct via mail order quantities modelers use Contact about purchasing copy very complete Stits manual $15 Bill Materials Balsa sheet stock contest grade strip stock light firm 11 /16 x 3 x 36 Two Y16 x 2 x 36 x 2 x 36 4 x 2 x 36 10 Y16-sq x 36 Four A-in sq x 36 Continued page 136 September 1991 135 RENEW 2 See Card Page 99 Foo FIyingS6dac AIoo LondiogGo CIeoConopyAooIobIe B6iIde 86 1255 S6ed 831365 DeI She,d I5 1695 Satisfaction Guaranteedi EAv HINc SH-710 Pkg 24- $295 THE HIGH-TECH HINGE DESIGNED FOR THE CYANOACRYLATE AGE Easier install other hinge No gouging picking messy epoxies Simply cut single knife slot hinge slide hinges place apply few drops favorite CA glue youre done SUPER FAST SUPER EASY SUPER STRONG 7de ea 9e4 foa 6aa SIG MFG CO INC.401-7 So Front StMontezuma IA 50171 623-5154 I ULTIMATESPORT RC 255 EnsI Ahiond/PO Boo 727/Sods Springs idoho 83276 ULIOIAIE ooo sri12085473742EoF~hd,foS,dSASE Eight X V16 X 36 12 / X Yt6 x 36 Eight /16 X x 36 Two x x 36 Two A-in sq x 36 Eight V16 x x 36 Spruce Two A-in sq x 36 Aircraft plywood x 6 x 12 /16 x 12 x 18 / x 6 x 18 Hardware pair 2/s-in Sullivan Skylite wheels Four A-in-dia wheel collars pair Goldberg A-in-dia axle assemblies set Goldberg strip aileron horn assemblies Two small nylon control horns Six 2-56 nylon clevis/rod sets 24-plus servo-mounting sheet metal screws Six 3A x 4-40 allen-head bolts blind nuts Four 3A x 2-56 allen-head bolts locknuts Du-Bro 10-32 nylon wing screw Du-Bro 10-32 brass threaded insert Two small nylon pushrod exit guides 15 small nylon pin-type hinges Du-Bro No 40 tail wheel mount assembly 3A-in tail wheel 2024-T3 x 090-in aluminum alloy appropriate commercial landing gear CB Associates 1 3A-in backplate-type plastic spinner Astro cobalt 05 15 motor system Throttle radio system choice yard 3A-oz fiberglass cloth Covering finish adhesive choice D responding advertisers mention read about Model Aviation RC Helicopters/Jolly Continued page 37 gimbaled Sony color video cam down-link TV transmitter unit super could have some definite industrial rescue applications interested project can contact Juan 415/930-0475 have also playing video-equipped RC aircraft helicopters quite challenge get everything working right comes together oh what picture have understand some great night flying Saturday night Im sorry missed attendance witness Orange County Radio Control Helicopter Association crash crew Kirk Olsen Herb Hoskins Joe Busher putting X Cell 60 back together Evidently switch harness failed during flight Saturday afternoon X-Cell proceeded fly about two minutesapparently mimicking Curtis Youngblood demonstration included inverted flight pirouettesall benefit help transmitter unleashed machine climbed high sky power-dived ground Anyway happy ending Leonard Nitro Alley opened shop crash crew able get parts needed Larry Lloyd Airtronics master radio tech local chopper maniac gave crew Quick Silver fuselage crew patiently watched everyone else fly work Sunday morning late afternoon renovated X-Cell took air flew well before mishap As side note OCRCHA crash crew would like thank Raves RC Products new molded X-Cell tail fins crash crew has completed rigorous field testing finds tail fins absolutely unbreakable through abnonnal usage also ran Gene Engelgau up Bakersfield Gene spending time Larry Lloyd field testing Lightest Pilots Available DARN GOOD AIRMEN Made USAFrom Jennies Jets Pilots Are Best Litelike Latex Rubber Build As Sportsman Barnstormer Bust Pilot KitFull Body Pilot Kit #108 118 acale.$695 #2061/6 scale.$ 995 #106 1/6 scale 205-1/5 scale.1095 #105 1/5 scale #204-1/4 scale.1195 / #104 1/4scale995 #2031/3 scale.1795 #103 1/3 scale.1595 Contains pilot head hands #308 1/8 jet695boots helmet cap goggles #307 1/7 Jet795full templates easy instructions Some simple sewing required Easy Assemble Finish 136 Model Aviation forerunner todays helicopters PCA-2 Pitcairn Autogiro operated regularly commercial firms experimentally US Navy Marines 1/48 WI LLIAMS BROS INC iei PAWNEE ST SAN MARCOS CA 92069619 744-3082 SEND $3 FOR COMPLETE COLOR CATALOG HM Catalog sioonGA DESIGNS Ordering InstructIons See dealer tirst 315 5483779135 East Main StreetDirect orders add $100 P&H NY residents add 70/0 tas FAX 315 5484099Phelps NY 14532 Ds OK
Edition: Model Aviation - 1991/09
Page Numbers: 26, 27, 28, 29, 30, 31, 32, 134, 135, 136
HERES SPORT aerobatic Electric looks like full-scale airplane performs like Gas model Tigerkitten E began take shape mind late 1988 After about year building flying Electrics watching flying others built growing tired backhanded complimentsyou know flies pretty well Electric time something about After spending several months analyzing existing Electric designs giving lot thought what really wanted new airplane began taking proven designone flight characteristics wantedand making work electric power chose Bobcat Mk2 February 1988 Model Builder Reducing models size Id have option using popular 05 motors completely reengineered structure taking advantage near-total lack vibration inherent electric power achieve significant weight reduction done changing Bobcats aerodynamic layout goal maximize performance potential readily available over-the-counter electric power systems state-of-the-art design Tigerkitten created expressly best equipment achieve good sport aerobatic performance put lot time thought finding particular combination wing area structure would offset weight penalty motor batteries currently available Performance compares favorably what experienced Gas modelers have come expect airplanes wont have make excuses model field Neither takeoff performance nor durability compromised Tigerkitten E operates restriction off surface might expect fly engine-powered model similar size achieved using somewhat greater wing area hence lower wing loading other popular models intended 05 power airplane exemplifies dictum Build fly crash Tigerkitten strong enough handle reasonable flight landing loads wasnt meant used sod hammer first prototype red-and-yellow color scheme weighs 56 oz its current power system configuration wing area 450 sq yields wing loading just under 18 oz per sq ftvery good aerobatic model size plane shows no structural deterioration after year active flying Though true love Scale entered Tigerkitten local AMA Novice Pattern competition its first contest just see what would happen As Electric field tied Gas model first place .e two Tigerkitten E prototypes after active flying session red-and-yellow model covered Sig SlIray cloth dyed Rit fab ric dye attached sealed clear nitrate dope color finish Stits Polytone full-scale aircraft paint later version uses dopefinished orange Litespan Bahama Blue Stits Polytone no fuel spills worry about planes look great cleanup Put geared Astro cobalt 15 state-of-the-art Electric add 11 x 7 prop either 12-cell 900-mAh SCR battery pack 14 SR 1000 Max cellsand go show gas-power buddies what quiet aerobatics about Dont bother make excuses Electricyou wont need ERobert Benjamin 26 Model Aviation 1990 U S Scalemasters championships Dallas privileged fly /6-scale Porterfield first modeler qualify compete using electric power see article Porterfield Collegiate April 1991 Model Aviation invited demonstrate red-and-yellow prototype during noon break three days flight judging winds never dropped below 20 mph little Kitten flew satisfying basic aerobatic routine surprising large crowd its clean silent flight despite conditions would have discouraged putting Gas models air could include videocassette copy article could see yourself difference Tigerkittens performance compared typical Electric Power systems key Tigerkittens success use very best electric power systems available cannot overemphasize youre serious about Electric flight want enjoy sort performance expect gas power owe yourself spend extra money cobalt motor system Im familiar Astro Flight line cobalt motors recommend Simply put motors will handle high current loads required fly way want fly prolonged basis deteriora tion Pay qualityand enjoy Currently have two prototypes Some minor internal refinements made second reflected plan Otherwise two structurally identical feature different color schemes power systems number prototype began life part attempt optimize performance available 05-size systems Initially used stock geared Astro cobalt 05 turning cleaned-up Rev-Up 11 x 7 prop nominal battery seven 1 200-mAh Sanyo SCR cells Performance acceptable outstanding present use nine SCR 1 200-mAh cells cleaned-up Super M 11 x 814 prop no longer market cleaned-up Rev-Up 11 /2 x 8 offers nearly same performance cut way down power loss dramatically increased rpm replacing stock power connectors Sermos connectors Astro Flight way expected shortly introduce its own low-loss September 1991 27 uui-ruu~u iup 1uw1 i mu i-veuI uu-mMn oauery P8CK TOT smro co balt 15 motor author currently experimenting 16 SR 1250 Magnum cells Ldown tail surfaces No 2 model Note elevator horn pushrod connection tail wheel assembly exit routing receiver antenna nose No 2 prototype cowl removed Stepping up Astro cobalt 05 motor used first prototype geared Astro cobalt 15 author rewarded slightly better performance Mounting dimensions 05 15 motors identical its difficult tell two installations apart close examination ulose-up -wneei ware second prototype Len left back panel cockpit locking pins removable top cowl/cockpit assembly white circles used simulate instrument panel right front panel turtledeck Note small insertion tubes cowl locking pins Right look cockpit opening/cooling air outlet shows rear rudder elevator servos arming switch Astro cobalt 15 system charging plug hidden under instrument panel radio switch connector will competitive Sermos variety perhaps less tricky use Throttle control via Jomar SM-4 optically coupled high-efficiency highrate throttle combination equipment allows effortless takeoffs somewhat rough usually wet grass off normally fly clean sequential loops level fight good Cuban eights point rolls inside square loops proper use throttle retard power cruise level between maneuvers motor throttle battery moderately warm landing Duration about five minutes-plus fly lot aerobatics six seven minutes Im just cruising around considered trade-offusing less voltage fewer cells accepting less challenging performance would increase duration Heres area ongoing improvements cell technology will make Electric flight better future After developing first prototype level realized pushed Astro 05 well beyond commonly perceived limitsalthough nearly far its capable going Moving up geared Astro cobalt 15 second blue-andorange version seemed make lot sense stock geared cobalt 15 nominal battery 12 900-mAh SCR cells APC 11 x 7 prop second prototype slightly outperforms first Im currently flying model number two same cobalt 15 running pack 14 SR 1000 Max cells new Astro Model 205 throttle control throttle well worth attention Although expensive Jomar SM-4 will handle power supplied fully self-contained ready mount making vastly easier set up install power combination turns APC 11 x 7 prop 7200 rpm flies airplane distinct authority have refrained using higher pitched props airplane number two because 11 x 7 pushing cobalt 15 its recommended sustained current level 15 amps motor designed create additional power through application higher voltage contrast 05 used first prototype designed permit higher current draw hence use higher pitched props have ralsed static current nearly 30 amps have yet reach limits either airplane-equipment combination capable being pushed writing Im experimenting battery pack 16 SR 1250 Magnum cells second prototype Thus equipped airplane weighs 62 oz wing loading 20 oz per sq ft just does nominal 12-cell 900-mAli SCR pack limitations sustained current draw SR 1250 Magnums can tolerate appears point Astro cobalt 15 might ideal motor use Performance promises spectacular Ill have leave suspense As write its November western Washington State wont stop raining Let emphasize self-described pushing power systems no way abuses Astro cobalt motors proper understanding current voltage loads motors designed judicious propeller selection proper understanding air cooling equipment use throttle rather extreme performance routinely available radio equipment both airplanes based two Airtronics Championship 7 FM transmitters updated model 92765 dual-conversion 1991 receivers Airtronics 94401 servos very lightweight radio batteries SR Batteries companys 300-mAli airborne receiver packs lightweight reliable allow use fast field charging 28 Model Aviation NO lx isni osa lanaing juax oeny view OT NO 1 proxoxype AC SHEET iMLSA llNDSHIELD PER pqrnwwL0C477N6 P/Al j*iSQ7VPSrWINGER REMOVEASLE 7DP COWLL4NNATED RUDDER TE Yipiy E1JIPI1E//T TRAYI/~ PLY TE 7XOBLER F-7 DU-ERO TAILkJitEEL ASSYLAMINA7D TIP 3/~SQ rn LONEERON /sso SIDL STR I/lEER ii iiy i/osq/iCSt UPRIGHT IJNE&---PP-FI ASTRO COBALT ogOR 75 LERVOS4kSO LOWER LONGE7ON IJITII YB%6C OUTER ClIP s* /C ci PS TRIPIJIJILr WIT/I HOT STUFF /SHEET AILERON TE OUTER COVER IN& ffSHEET SrIFFENER pq F-2 MOLDED FIBEREL4SS COWL WHEEL PINT I3RALRET0Fewr L SPAR OOLJ8ER& VAXIF ASSYIii SI/EAT SKI/I MOLDED F/BEtIiLASS WI/EEL PANT 2YiSULLIVAJI SKY-LITE WI/EEL LA If/NA TED TIP r/GE-RK/rTEN E DESIjSJIED IAN 1/V R 1/ENTAIl IN Ct I%SPINNER COOL/NC- INWKE compromising batteries After comparative testing both airplanes recommend youre already committed particular equipment consider starting off geared Astro cobalt 15 12-cell battery pack Should have geared 05 can expect about same performance nine-cell battery although gross weight will about five ounces lower duration several minutes less 12-cell/cobalt-iS combination gives honest seven- eight-minute flights suppose number higher performance ferrite motors would fly design safely remain unconvinced theyd fly well youre accomplished flier wants try Electric wont have step down performance level youre accustomed Tigerkitten E Its great way get started must take exception notion experienced flier ought start out Electric inexpensive low-powered model Such airplane may simply confirm suspicions about Electrics lack performance What could discouraging Let also emphasize Tigerkitten trainer good trainers both Gas Electric available learning fly way match power performance primary Gas trainer simply equip readymade Electric trainer recommended Astro cobalt power systems Think about Aircraft structure Electric flight Given current state development electric power systems key equaling gas-powered performance compensate weight motor battery rAS- %CUSaM AU ALVAOUR/A SaraOCVU7MC I*LAMUA SPACERS CStWJMMA C5V5/MU /ACMTSU MASSE AUEAAASMMUS U/UTh- CaUSAL ISlAM EASE/MIS proportionately light structure Several characteristics electric power make practical prevent airplanes becoming fragile Because electric power very nearly vibration-free produces no fuel exhaust residue much structure thats essential Gas models becomes redundant Electric absorb damp vibration inherent smoothest running best balanced two- four-stroke engines must include lot plywood thick balsa extra glue contribute nothing airframe strength terms resisting flight loads quarter-inch sheet balsa sides 40-size sport models good example vibration submit appropriately braced %-in %2 sheet would job perfectly well Clearly would eliminate need heavy bath epoxy inside nose just sensibly constructed Electrics problem weve become accustomed building resist vibration structure designed other way tends look suspect Closely allied trend toward using largest engine will stay attached airframe full power Little wonder Gas models have wing loadings reminiscent fat brick though theyll 30 Model Aviation vertical tail rudder completely sembled Construction begins hori zontal vertical tail surfaces laminated wing tip has completely assembled except addition short spar leading edge extension top Note lamination form still place wing structurally complete except installation aileron fuselage sides have joined balsa croaspieces tail post tormers stringers added everything rounded sanding faired rudder hor izontal tail surfaces also place 1443a034flyM34 WVWVOSWVWV WVWVWVWNW4-444 *flRASMVLMWV 344334*7FWSMg*M3LWR PLrIi I34 4M4 4M3334444-737433SacrJ34Wfr33Sf/flA 341344334337 /Sp4*34/34OWTW 443*343 4333443034*34345LI II 4a4ji34A S4-*3/554rVM/S4344433 3M 434 44*37*53434 ILIII hiIL4 -53444 *4343453333[ 433 W3334S434/ 333343334 i34 34033 34 334533433PS 34 4343445 /47 5333334/EAS43SU3443434 1 -4443/Sf434/44034435 34 333 43M 34134/3377 /3/k WuWVnrwW4o33354337*3 g-Mr 334434 4/33434343 3333 --3334334333434 44S34454 3/-I/S 4MEV344 4/444/43/Mg 3443433 AAa344WA3M713w3 4d 444/1-Ti 4LWMW4//4444/ 0 p 3WOE393 3343 0333434 *45/re rn/car34Sfl 3/3343343473433343434*/4M74K3/571334 y3/0/534 353 3303 034334333* ATWA443443434-W3343334 i)034433434M3434#434rn 44334533 M3M43 7/ rIGRKIrrEN E 33334 34CM flrcar 443433 534340 43343 Car 3 jS-We Full-Size Plans AvailableSee Page 1 88Detailed construction notes accompany lull-size plans climb straight up easily enough accustomed seeing sort thing perfectly airworthy structure designed withstand normal flight loads reasonable handling too often strikes us flimsy youve built Free Flight models already understand keep Tigerkitten light intended its important use materials appropriate dimensions Several other considerations must kept mind Wood selection critical place contest-grade balsa available better hobby shops Though its somewhat expensive garden-variety stuff itNmakes difference Goodquality balsa four- six-pound density can save six ounces total weight choice adhesive equally critical isnt time lots heavy epoxy use Hot Stuff products exclusively Both Tigerkittens built thick variety UFO cyanoacrylate CyA glue occasional shot fast-setting thin variety Independent tests have shown Hot Stuff far strongest CyAs hobby market have observed UFO formulation can eliminate problems irritation sensitive individuals youre uncomfortable using type material indeed have allergy problem try aliphatic resin insteadwork area between parts being Any adhesive intended wood does itsjoined Excessive glue squeezeout removable top cowl permits battery replacement seconds Fibergiassing cowl adds Immensely strength durability No 1 model has flown year abso lutely no problems related cowl surrounding fuselage structure September 1991 31 sign sloppy work adds excess weight would-be craftsman recommends layer glue wiped outside joint betrays ignorance principles wood aircraft construction Wet area joined thoroughly lightly glue use light clamping pressure joining parts youll job right Make fit sand some build smarter subject weight Ill give some targets aim completed wing fiberglassed hinges place servo covering/finish should weigh between five seven ounces completely finished wing airplane number two weighs 85 oz flight ready bare fuselage/tail assembly motor battery landing gear radio should weigh between six eight ounces can hit weights use appropriate covering/finish install recommended equivalent power radio equipment youll have no problems related weight Covering finishing Several options available Doubtless will choose among one-step plastic film coverings comment suggest accept slight weight penalty sake somewhat greater structural rigidity heavier films offer models structure intended rely some degree tension covering torsional rigidity lightest films wont help much personally prefer traditional approach covering finishing both opportunity exercise craftsmanship because greater strength durability properly executed fabric-and-dope finish provides type covering can shrunk tighter plastic film painted finish permanently seals locks seams Airplane number covered Sig Silray cloth dyed Rit fabric dye attached sealed clear nitrate dope color finish Stits Polytone fullscale aircraft paint part Stits Process aircraft covering finishing system Stits Polytone best stuff Ive ever seen finishing airplanes size light one-part paint excellent covering power its easy spray forgiving overspray repair fuelproof glow-power friend slops fuel airplane totally nonshrinking Think about last wish write Stits information brochure manual describing companys entire product line full-scale use both available address given end article should mention Polytone paint referred intended use over Continued page 134 32 Model Aviation basic top cowl components ready assembly view base plate has opened up sufficiently accept 05 battery packs No 1 prototype airframe structurally complete ready covering Since Tigerkittens structure relies some degree tension covering tor sional rigidity use heavier film coverings old-fashioned fabric-and-dope Bet kitten brings good luck its namesake photos Robert Benlamin high-current terminal voltage seven volts 7000 millivolts total 57 millivolts average would represent 008% loss As example 10000 rpm nominal loss associated two-pin connector set would about 16 rpm would visible three-digit tack percentage rpm loss would course smaller higher cell counts Incidentally info new connectors Since have no accumulated histoty application cant say connector performance will hold up repeated mating However have no reason expect significant deterioration normal modeling use including use charging function often exercised electrical joint separate charge jack Id like close month short story about power Im always impressed seemingly awesome power can associate Astro 60 some impressive-sounding big imported motors example 60 28-cell pack peak current condition say 30 amps over horsepower C 840 watts assuming volt per cell Certainly kilowatt in-bounds Awesome huh Well just put things perspective recently enjoyed social conversation third-year physics graduate student telling project working particular developing power supply particle accelerator power supply develops megavolt supplies megampere 60 nanoseconds say supply develops 1000000 volts delivers 1000000 amps terawatt 0000000060 seconds voltage rise time 20 nanoseconds giving slew rate about 50 mega-megavolts per second Next time youre wallowing thoughts awesome power biggest Electric reflect above kinda puts us place wouldnt ya say Incidentally can anyone guess what project uses switch wire Finally case youre wondering Electric Installations will continue future another column closes Please have happy safe Electric flying season See ya Greatest Electric Show EarthKRC D & G BALSA SAVE ON YOUR BALSA & PLYWOOD NEEDS NO MINIMUM ORDER SEND SASE FOR PRICE LIST 2422 N Marks #373 Fresno CA 93722 Ph 277-WOOD 209 277-9663 RC Tiger/Benjamin Continued page 32 Stits covering base finish products have determined purposes works very well over clear nitrate dope did use Stits Process line exactly indicated full-scale aircraft Scalemasters Porterfield excellent results Tigerkitten number two covered new product called Litespan heatshrink plastic made England Litespan imported distributed Idealair Models Charlies R/C Goodies Its available number transparent opaque colors weighs 1/ oz per sq ftlighter comparable material market Like Micafilm its applied using iron separate brushed-on adhesive unlike Micafilm Litespan paintablereally tested quite few samples before deciding use stuff Tigerkitten blue-and-orange airplane covered transparent orange Litespan finished two coats clear nitrate dope shrinks tighter heating Bahama Blue Stits Polytone white striping tape two coats clear Polytone An Electric covered Litespan added paint finish would probably hold up well advantages paint finish making covering significantly tauter adding gloss durability worth several ounces added weight custom Tigerkitten E markings both airplanes made order Vinylwrite Custom Lettering Preparing flight chosen covering finish place put everything back together certain works way want Set control throws give aileron differential about two can done either bending aileron control horns forward attaching pushrods servo output aft center use combination both purpose eliminate need 134 Model Aviation DEMOUNTABLE HINGE Demountable easy * Construction * Finishing * Repair 1/4 inch Fourmost Demountable Hinge gapless Nylon hinge allows modeler easily remove control surfaces model 1/32 inch piano wire holds hinge place Hinge may installed easily CA adhesives Hinge sold packages 12 6 inch segments sufficient span 3 feet hinge Although manufactured white Hinge may dyed painted match finish Hinge deflects plus minus 45 degrees Price 3 ft $495 Product No 141 Fourmost Products 503 357-2732 PATCHES CUSTOM AND STOCK EMBROIDERED EMBLEMS NAMEBADGES FOR CLUBS AiRCRAFT MEMORABIUA JEWELRY PINS TACKS HATS BUCKLES DESK NAMEPLATES PENSETS AND MORE SASE FOR CATALOG GENERAllON PRODUCTS CO INC 3000 KAVANAUGH SUITE B LITTLE ROCK ARKANSAS 72205 SINCE 1977 coordinating rudder aileron prevent adverse yaw turns Start about 200 up 100 down Elevator movement should 200 way rudder least 350 Once youre comfortable model may want increase movements somewhat Install battery pack move around until airplane balances point shown plan25% chord balance point airplane properly responsive controls becoming jumpy Spin entry level snap rolls positive sufficient elevator throw used recovery virtually instantaneous Ive dragged both airplanes nose-high low speed over sky having anything violent mush down speed got too low suggest test Tigerkitten E balance point decide want snappier stall maneuvers move center-of-gravity back between 30% 33% cannot overstress importance doing thorough job preflight testing entire airplane its systems Range-check motor running Use ESV expanded scale voltmeter receiver transmitter batteries beginning flying session Make absolutely certain model balanced aligned warp-free before first flight youll set years rewarding flying Flying Remember start sharp anticipate actions Let airplane build up speed fly off ground fast flat until youre sure what its going Trimmed indicated Tigerkitten E will go essentially point touch positive stability axes Dont afraid blink pay attention stay oriented airplane Tigerkittens seem fD&J ELECTRONICS 900 Lucy Road Howell Michigan 48843 517-546-2644 Service & Repairs Most Radio Control Systems Utilizing Calibrated Test Equipment & Spectrum Analyzer Endorsed AMA RCMA Sticker Station #105 Futaba Airtronics JR Ace HiTec Tower Cirrus World Engines & WE USE GENUINE FACTORY REPLACEMENT PARTS Complete 1991 Narrow Banding & Upgrades RCD / HITEC R/C DEALER Carry Full Line RCD RXs & Products Upgrading. ASK ABOUT THE NEW HOT FOCUS SERIES RADIO CONTROL SYSTEMS FCC Licensed Speed Control Repairs Quality Service Fast Turn Around Shipping & Insurance Extra. UPS Mail VISA / MASTERCARD & DISCOVER WELCOMED AMA #256123ARRLWB8YSQ prefer being brought down little fast side wheel landing attitude mains first tail wheel air rather being three-pointed Once youre ease airplane urge experiment prop/battery combinations am anxious receive input build fly design order establish wider base information power options could ever alone may well 40-size version future fine points design could depend shared experience 05-15 version Good luck think Electric Additional information Stits products available through Bobs Aircraft Supply & Avionics Attention Karen Sandberg Pierce County Airport 17017 Meridian E Puyallup WA 98373 telephone 800331-4375 206-848-9349 Canada Karen Sandberg has agreed make Stits products available direct via mail order quantities modelers use Contact about purchasing copy very complete Stits manual $15 Bill Materials Balsa sheet stock contest grade strip stock light firm 11 /16 x 3 x 36 Two Y16 x 2 x 36 x 2 x 36 4 x 2 x 36 10 Y16-sq x 36 Four A-in sq x 36 Continued page 136 September 1991 135 RENEW 2 See Card Page 99 Foo FIyingS6dac AIoo LondiogGo CIeoConopyAooIobIe B6iIde 86 1255 S6ed 831365 DeI She,d I5 1695 Satisfaction Guaranteedi EAv HINc SH-710 Pkg 24- $295 THE HIGH-TECH HINGE DESIGNED FOR THE CYANOACRYLATE AGE Easier install other hinge No gouging picking messy epoxies Simply cut single knife slot hinge slide hinges place apply few drops favorite CA glue youre done SUPER FAST SUPER EASY SUPER STRONG 7de ea 9e4 foa 6aa SIG MFG CO INC.401-7 So Front StMontezuma IA 50171 623-5154 I ULTIMATESPORT RC 255 EnsI Ahiond/PO Boo 727/Sods Springs idoho 83276 ULIOIAIE ooo sri12085473742EoF~hd,foS,dSASE Eight X V16 X 36 12 / X Yt6 x 36 Eight /16 X x 36 Two x x 36 Two A-in sq x 36 Eight V16 x x 36 Spruce Two A-in sq x 36 Aircraft plywood x 6 x 12 /16 x 12 x 18 / x 6 x 18 Hardware pair 2/s-in Sullivan Skylite wheels Four A-in-dia wheel collars pair Goldberg A-in-dia axle assemblies set Goldberg strip aileron horn assemblies Two small nylon control horns Six 2-56 nylon clevis/rod sets 24-plus servo-mounting sheet metal screws Six 3A x 4-40 allen-head bolts blind nuts Four 3A x 2-56 allen-head bolts locknuts Du-Bro 10-32 nylon wing screw Du-Bro 10-32 brass threaded insert Two small nylon pushrod exit guides 15 small nylon pin-type hinges Du-Bro No 40 tail wheel mount assembly 3A-in tail wheel 2024-T3 x 090-in aluminum alloy appropriate commercial landing gear CB Associates 1 3A-in backplate-type plastic spinner Astro cobalt 05 15 motor system Throttle radio system choice yard 3A-oz fiberglass cloth Covering finish adhesive choice D responding advertisers mention read about Model Aviation RC Helicopters/Jolly Continued page 37 gimbaled Sony color video cam down-link TV transmitter unit super could have some definite industrial rescue applications interested project can contact Juan 415/930-0475 have also playing video-equipped RC aircraft helicopters quite challenge get everything working right comes together oh what picture have understand some great night flying Saturday night Im sorry missed attendance witness Orange County Radio Control Helicopter Association crash crew Kirk Olsen Herb Hoskins Joe Busher putting X Cell 60 back together Evidently switch harness failed during flight Saturday afternoon X-Cell proceeded fly about two minutesapparently mimicking Curtis Youngblood demonstration included inverted flight pirouettesall benefit help transmitter unleashed machine climbed high sky power-dived ground Anyway happy ending Leonard Nitro Alley opened shop crash crew able get parts needed Larry Lloyd Airtronics master radio tech local chopper maniac gave crew Quick Silver fuselage crew patiently watched everyone else fly work Sunday morning late afternoon renovated X-Cell took air flew well before mishap As side note OCRCHA crash crew would like thank Raves RC Products new molded X-Cell tail fins crash crew has completed rigorous field testing finds tail fins absolutely unbreakable through abnonnal usage also ran Gene Engelgau up Bakersfield Gene spending time Larry Lloyd field testing Lightest Pilots Available DARN GOOD AIRMEN Made USAFrom Jennies Jets Pilots Are Best Litelike Latex Rubber Build As Sportsman Barnstormer Bust Pilot KitFull Body Pilot Kit #108 118 acale.$695 #2061/6 scale.$ 995 #106 1/6 scale 205-1/5 scale.1095 #105 1/5 scale #204-1/4 scale.1195 / #104 1/4scale995 #2031/3 scale.1795 #103 1/3 scale.1595 Contains pilot head hands #308 1/8 jet695boots helmet cap goggles #307 1/7 Jet795full templates easy instructions Some simple sewing required Easy Assemble Finish 136 Model Aviation forerunner todays helicopters PCA-2 Pitcairn Autogiro operated regularly commercial firms experimentally US Navy Marines 1/48 WI LLIAMS BROS INC iei PAWNEE ST SAN MARCOS CA 92069619 744-3082 SEND $3 FOR COMPLETE COLOR CATALOG HM Catalog sioonGA DESIGNS Ordering InstructIons See dealer tirst 315 5483779135 East Main StreetDirect orders add $100 P&H NY residents add 70/0 tas FAX 315 5484099Phelps NY 14532 Ds OK
Edition: Model Aviation - 1991/09
Page Numbers: 26, 27, 28, 29, 30, 31, 32, 134, 135, 136
HERES SPORT aerobatic Electric looks like full-scale airplane performs like Gas model Tigerkitten E began take shape mind late 1988 After about year building flying Electrics watching flying others built growing tired backhanded complimentsyou know flies pretty well Electric time something about After spending several months analyzing existing Electric designs giving lot thought what really wanted new airplane began taking proven designone flight characteristics wantedand making work electric power chose Bobcat Mk2 February 1988 Model Builder Reducing models size Id have option using popular 05 motors completely reengineered structure taking advantage near-total lack vibration inherent electric power achieve significant weight reduction done changing Bobcats aerodynamic layout goal maximize performance potential readily available over-the-counter electric power systems state-of-the-art design Tigerkitten created expressly best equipment achieve good sport aerobatic performance put lot time thought finding particular combination wing area structure would offset weight penalty motor batteries currently available Performance compares favorably what experienced Gas modelers have come expect airplanes wont have make excuses model field Neither takeoff performance nor durability compromised Tigerkitten E operates restriction off surface might expect fly engine-powered model similar size achieved using somewhat greater wing area hence lower wing loading other popular models intended 05 power airplane exemplifies dictum Build fly crash Tigerkitten strong enough handle reasonable flight landing loads wasnt meant used sod hammer first prototype red-and-yellow color scheme weighs 56 oz its current power system configuration wing area 450 sq yields wing loading just under 18 oz per sq ftvery good aerobatic model size plane shows no structural deterioration after year active flying Though true love Scale entered Tigerkitten local AMA Novice Pattern competition its first contest just see what would happen As Electric field tied Gas model first place .e two Tigerkitten E prototypes after active flying session red-and-yellow model covered Sig SlIray cloth dyed Rit fab ric dye attached sealed clear nitrate dope color finish Stits Polytone full-scale aircraft paint later version uses dopefinished orange Litespan Bahama Blue Stits Polytone no fuel spills worry about planes look great cleanup Put geared Astro cobalt 15 state-of-the-art Electric add 11 x 7 prop either 12-cell 900-mAh SCR battery pack 14 SR 1000 Max cellsand go show gas-power buddies what quiet aerobatics about Dont bother make excuses Electricyou wont need ERobert Benjamin 26 Model Aviation 1990 U S Scalemasters championships Dallas privileged fly /6-scale Porterfield first modeler qualify compete using electric power see article Porterfield Collegiate April 1991 Model Aviation invited demonstrate red-and-yellow prototype during noon break three days flight judging winds never dropped below 20 mph little Kitten flew satisfying basic aerobatic routine surprising large crowd its clean silent flight despite conditions would have discouraged putting Gas models air could include videocassette copy article could see yourself difference Tigerkittens performance compared typical Electric Power systems key Tigerkittens success use very best electric power systems available cannot overemphasize youre serious about Electric flight want enjoy sort performance expect gas power owe yourself spend extra money cobalt motor system Im familiar Astro Flight line cobalt motors recommend Simply put motors will handle high current loads required fly way want fly prolonged basis deteriora tion Pay qualityand enjoy Currently have two prototypes Some minor internal refinements made second reflected plan Otherwise two structurally identical feature different color schemes power systems number prototype began life part attempt optimize performance available 05-size systems Initially used stock geared Astro cobalt 05 turning cleaned-up Rev-Up 11 x 7 prop nominal battery seven 1 200-mAh Sanyo SCR cells Performance acceptable outstanding present use nine SCR 1 200-mAh cells cleaned-up Super M 11 x 814 prop no longer market cleaned-up Rev-Up 11 /2 x 8 offers nearly same performance cut way down power loss dramatically increased rpm replacing stock power connectors Sermos connectors Astro Flight way expected shortly introduce its own low-loss September 1991 27 uui-ruu~u iup 1uw1 i mu i-veuI uu-mMn oauery P8CK TOT smro co balt 15 motor author currently experimenting 16 SR 1250 Magnum cells Ldown tail surfaces No 2 model Note elevator horn pushrod connection tail wheel assembly exit routing receiver antenna nose No 2 prototype cowl removed Stepping up Astro cobalt 05 motor used first prototype geared Astro cobalt 15 author rewarded slightly better performance Mounting dimensions 05 15 motors identical its difficult tell two installations apart close examination ulose-up -wneei ware second prototype Len left back panel cockpit locking pins removable top cowl/cockpit assembly white circles used simulate instrument panel right front panel turtledeck Note small insertion tubes cowl locking pins Right look cockpit opening/cooling air outlet shows rear rudder elevator servos arming switch Astro cobalt 15 system charging plug hidden under instrument panel radio switch connector will competitive Sermos variety perhaps less tricky use Throttle control via Jomar SM-4 optically coupled high-efficiency highrate throttle combination equipment allows effortless takeoffs somewhat rough usually wet grass off normally fly clean sequential loops level fight good Cuban eights point rolls inside square loops proper use throttle retard power cruise level between maneuvers motor throttle battery moderately warm landing Duration about five minutes-plus fly lot aerobatics six seven minutes Im just cruising around considered trade-offusing less voltage fewer cells accepting less challenging performance would increase duration Heres area ongoing improvements cell technology will make Electric flight better future After developing first prototype level realized pushed Astro 05 well beyond commonly perceived limitsalthough nearly far its capable going Moving up geared Astro cobalt 15 second blue-andorange version seemed make lot sense stock geared cobalt 15 nominal battery 12 900-mAh SCR cells APC 11 x 7 prop second prototype slightly outperforms first Im currently flying model number two same cobalt 15 running pack 14 SR 1000 Max cells new Astro Model 205 throttle control throttle well worth attention Although expensive Jomar SM-4 will handle power supplied fully self-contained ready mount making vastly easier set up install power combination turns APC 11 x 7 prop 7200 rpm flies airplane distinct authority have refrained using higher pitched props airplane number two because 11 x 7 pushing cobalt 15 its recommended sustained current level 15 amps motor designed create additional power through application higher voltage contrast 05 used first prototype designed permit higher current draw hence use higher pitched props have ralsed static current nearly 30 amps have yet reach limits either airplane-equipment combination capable being pushed writing Im experimenting battery pack 16 SR 1250 Magnum cells second prototype Thus equipped airplane weighs 62 oz wing loading 20 oz per sq ft just does nominal 12-cell 900-mAli SCR pack limitations sustained current draw SR 1250 Magnums can tolerate appears point Astro cobalt 15 might ideal motor use Performance promises spectacular Ill have leave suspense As write its November western Washington State wont stop raining Let emphasize self-described pushing power systems no way abuses Astro cobalt motors proper understanding current voltage loads motors designed judicious propeller selection proper understanding air cooling equipment use throttle rather extreme performance routinely available radio equipment both airplanes based two Airtronics Championship 7 FM transmitters updated model 92765 dual-conversion 1991 receivers Airtronics 94401 servos very lightweight radio batteries SR Batteries companys 300-mAli airborne receiver packs lightweight reliable allow use fast field charging 28 Model Aviation NO lx isni osa lanaing juax oeny view OT NO 1 proxoxype AC SHEET iMLSA llNDSHIELD PER pqrnwwL0C477N6 P/Al j*iSQ7VPSrWINGER REMOVEASLE 7DP COWLL4NNATED RUDDER TE Yipiy E1JIPI1E//T TRAYI/~ PLY TE 7XOBLER F-7 DU-ERO TAILkJitEEL ASSYLAMINA7D TIP 3/~SQ rn LONEERON /sso SIDL STR I/lEER ii iiy i/osq/iCSt UPRIGHT IJNE&---PP-FI ASTRO COBALT ogOR 75 LERVOS4kSO LOWER LONGE7ON IJITII YB%6C OUTER ClIP s* /C ci PS TRIPIJIJILr WIT/I HOT STUFF /SHEET AILERON TE OUTER COVER IN& ffSHEET SrIFFENER pq F-2 MOLDED FIBEREL4SS COWL WHEEL PINT I3RALRET0Fewr L SPAR OOLJ8ER& VAXIF ASSYIii SI/EAT SKI/I MOLDED F/BEtIiLASS WI/EEL PANT 2YiSULLIVAJI SKY-LITE WI/EEL LA If/NA TED TIP r/GE-RK/rTEN E DESIjSJIED IAN 1/V R 1/ENTAIl IN Ct I%SPINNER COOL/NC- INWKE compromising batteries After comparative testing both airplanes recommend youre already committed particular equipment consider starting off geared Astro cobalt 15 12-cell battery pack Should have geared 05 can expect about same performance nine-cell battery although gross weight will about five ounces lower duration several minutes less 12-cell/cobalt-iS combination gives honest seven- eight-minute flights suppose number higher performance ferrite motors would fly design safely remain unconvinced theyd fly well youre accomplished flier wants try Electric wont have step down performance level youre accustomed Tigerkitten E Its great way get started must take exception notion experienced flier ought start out Electric inexpensive low-powered model Such airplane may simply confirm suspicions about Electrics lack performance What could discouraging Let also emphasize Tigerkitten trainer good trainers both Gas Electric available learning fly way match power performance primary Gas trainer simply equip readymade Electric trainer recommended Astro cobalt power systems Think about Aircraft structure Electric flight Given current state development electric power systems key equaling gas-powered performance compensate weight motor battery rAS- %CUSaM AU ALVAOUR/A SaraOCVU7MC I*LAMUA SPACERS CStWJMMA C5V5/MU /ACMTSU MASSE AUEAAASMMUS U/UTh- CaUSAL ISlAM EASE/MIS proportionately light structure Several characteristics electric power make practical prevent airplanes becoming fragile Because electric power very nearly vibration-free produces no fuel exhaust residue much structure thats essential Gas models becomes redundant Electric absorb damp vibration inherent smoothest running best balanced two- four-stroke engines must include lot plywood thick balsa extra glue contribute nothing airframe strength terms resisting flight loads quarter-inch sheet balsa sides 40-size sport models good example vibration submit appropriately braced %-in %2 sheet would job perfectly well Clearly would eliminate need heavy bath epoxy inside nose just sensibly constructed Electrics problem weve become accustomed building resist vibration structure designed other way tends look suspect Closely allied trend toward using largest engine will stay attached airframe full power Little wonder Gas models have wing loadings reminiscent fat brick though theyll 30 Model Aviation vertical tail rudder completely sembled Construction begins hori zontal vertical tail surfaces laminated wing tip has completely assembled except addition short spar leading edge extension top Note lamination form still place wing structurally complete except installation aileron fuselage sides have joined balsa croaspieces tail post tormers stringers added everything rounded sanding faired rudder hor izontal tail surfaces also place 1443a034flyM34 WVWVOSWVWV WVWVWVWNW4-444 *flRASMVLMWV 344334*7FWSMg*M3LWR PLrIi I34 4M4 4M3334444-737433SacrJ34Wfr33Sf/flA 341344334337 /Sp4*34/34OWTW 443*343 4333443034*34345LI II 4a4ji34A S4-*3/554rVM/S4344433 3M 434 44*37*53434 ILIII hiIL4 -53444 *4343453333[ 433 W3334S434/ 333343334 i34 34033 34 334533433PS 34 4343445 /47 5333334/EAS43SU3443434 1 -4443/Sf434/44034435 34 333 43M 34134/3377 /3/k WuWVnrwW4o33354337*3 g-Mr 334434 4/33434343 3333 --3334334333434 44S34454 3/-I/S 4MEV344 4/444/43/Mg 3443433 AAa344WA3M713w3 4d 444/1-Ti 4LWMW4//4444/ 0 p 3WOE393 3343 0333434 *45/re rn/car34Sfl 3/3343343473433343434*/4M74K3/571334 y3/0/534 353 3303 034334333* ATWA443443434-W3343334 i)034433434M3434#434rn 44334533 M3M43 7/ rIGRKIrrEN E 33334 34CM flrcar 443433 534340 43343 Car 3 jS-We Full-Size Plans AvailableSee Page 1 88Detailed construction notes accompany lull-size plans climb straight up easily enough accustomed seeing sort thing perfectly airworthy structure designed withstand normal flight loads reasonable handling too often strikes us flimsy youve built Free Flight models already understand keep Tigerkitten light intended its important use materials appropriate dimensions Several other considerations must kept mind Wood selection critical place contest-grade balsa available better hobby shops Though its somewhat expensive garden-variety stuff itNmakes difference Goodquality balsa four- six-pound density can save six ounces total weight choice adhesive equally critical isnt time lots heavy epoxy use Hot Stuff products exclusively Both Tigerkittens built thick variety UFO cyanoacrylate CyA glue occasional shot fast-setting thin variety Independent tests have shown Hot Stuff far strongest CyAs hobby market have observed UFO formulation can eliminate problems irritation sensitive individuals youre uncomfortable using type material indeed have allergy problem try aliphatic resin insteadwork area between parts being Any adhesive intended wood does itsjoined Excessive glue squeezeout removable top cowl permits battery replacement seconds Fibergiassing cowl adds Immensely strength durability No 1 model has flown year abso lutely no problems related cowl surrounding fuselage structure September 1991 31 sign sloppy work adds excess weight would-be craftsman recommends layer glue wiped outside joint betrays ignorance principles wood aircraft construction Wet area joined thoroughly lightly glue use light clamping pressure joining parts youll job right Make fit sand some build smarter subject weight Ill give some targets aim completed wing fiberglassed hinges place servo covering/finish should weigh between five seven ounces completely finished wing airplane number two weighs 85 oz flight ready bare fuselage/tail assembly motor battery landing gear radio should weigh between six eight ounces can hit weights use appropriate covering/finish install recommended equivalent power radio equipment youll have no problems related weight Covering finishing Several options available Doubtless will choose among one-step plastic film coverings comment suggest accept slight weight penalty sake somewhat greater structural rigidity heavier films offer models structure intended rely some degree tension covering torsional rigidity lightest films wont help much personally prefer traditional approach covering finishing both opportunity exercise craftsmanship because greater strength durability properly executed fabric-and-dope finish provides type covering can shrunk tighter plastic film painted finish permanently seals locks seams Airplane number covered Sig Silray cloth dyed Rit fabric dye attached sealed clear nitrate dope color finish Stits Polytone fullscale aircraft paint part Stits Process aircraft covering finishing system Stits Polytone best stuff Ive ever seen finishing airplanes size light one-part paint excellent covering power its easy spray forgiving overspray repair fuelproof glow-power friend slops fuel airplane totally nonshrinking Think about last wish write Stits information brochure manual describing companys entire product line full-scale use both available address given end article should mention Polytone paint referred intended use over Continued page 134 32 Model Aviation basic top cowl components ready assembly view base plate has opened up sufficiently accept 05 battery packs No 1 prototype airframe structurally complete ready covering Since Tigerkittens structure relies some degree tension covering tor sional rigidity use heavier film coverings old-fashioned fabric-and-dope Bet kitten brings good luck its namesake photos Robert Benlamin high-current terminal voltage seven volts 7000 millivolts total 57 millivolts average would represent 008% loss As example 10000 rpm nominal loss associated two-pin connector set would about 16 rpm would visible three-digit tack percentage rpm loss would course smaller higher cell counts Incidentally info new connectors Since have no accumulated histoty application cant say connector performance will hold up repeated mating However have no reason expect significant deterioration normal modeling use including use charging function often exercised electrical joint separate charge jack Id like close month short story about power Im always impressed seemingly awesome power can associate Astro 60 some impressive-sounding big imported motors example 60 28-cell pack peak current condition say 30 amps over horsepower C 840 watts assuming volt per cell Certainly kilowatt in-bounds Awesome huh Well just put things perspective recently enjoyed social conversation third-year physics graduate student telling project working particular developing power supply particle accelerator power supply develops megavolt supplies megampere 60 nanoseconds say supply develops 1000000 volts delivers 1000000 amps terawatt 0000000060 seconds voltage rise time 20 nanoseconds giving slew rate about 50 mega-megavolts per second Next time youre wallowing thoughts awesome power biggest Electric reflect above kinda puts us place wouldnt ya say Incidentally can anyone guess what project uses switch wire Finally case youre wondering Electric Installations will continue future another column closes Please have happy safe Electric flying season See ya Greatest Electric Show EarthKRC D & G BALSA SAVE ON YOUR BALSA & PLYWOOD NEEDS NO MINIMUM ORDER SEND SASE FOR PRICE LIST 2422 N Marks #373 Fresno CA 93722 Ph 277-WOOD 209 277-9663 RC Tiger/Benjamin Continued page 32 Stits covering base finish products have determined purposes works very well over clear nitrate dope did use Stits Process line exactly indicated full-scale aircraft Scalemasters Porterfield excellent results Tigerkitten number two covered new product called Litespan heatshrink plastic made England Litespan imported distributed Idealair Models Charlies R/C Goodies Its available number transparent opaque colors weighs 1/ oz per sq ftlighter comparable material market Like Micafilm its applied using iron separate brushed-on adhesive unlike Micafilm Litespan paintablereally tested quite few samples before deciding use stuff Tigerkitten blue-and-orange airplane covered transparent orange Litespan finished two coats clear nitrate dope shrinks tighter heating Bahama Blue Stits Polytone white striping tape two coats clear Polytone An Electric covered Litespan added paint finish would probably hold up well advantages paint finish making covering significantly tauter adding gloss durability worth several ounces added weight custom Tigerkitten E markings both airplanes made order Vinylwrite Custom Lettering Preparing flight chosen covering finish place put everything back together certain works way want Set control throws give aileron differential about two can done either bending aileron control horns forward attaching pushrods servo output aft center use combination both purpose eliminate need 134 Model Aviation DEMOUNTABLE HINGE Demountable easy * Construction * Finishing * Repair 1/4 inch Fourmost Demountable Hinge gapless Nylon hinge allows modeler easily remove control surfaces model 1/32 inch piano wire holds hinge place Hinge may installed easily CA adhesives Hinge sold packages 12 6 inch segments sufficient span 3 feet hinge Although manufactured white Hinge may dyed painted match finish Hinge deflects plus minus 45 degrees Price 3 ft $495 Product No 141 Fourmost Products 503 357-2732 PATCHES CUSTOM AND STOCK EMBROIDERED EMBLEMS NAMEBADGES FOR CLUBS AiRCRAFT MEMORABIUA JEWELRY PINS TACKS HATS BUCKLES DESK NAMEPLATES PENSETS AND MORE SASE FOR CATALOG GENERAllON PRODUCTS CO INC 3000 KAVANAUGH SUITE B LITTLE ROCK ARKANSAS 72205 SINCE 1977 coordinating rudder aileron prevent adverse yaw turns Start about 200 up 100 down Elevator movement should 200 way rudder least 350 Once youre comfortable model may want increase movements somewhat Install battery pack move around until airplane balances point shown plan25% chord balance point airplane properly responsive controls becoming jumpy Spin entry level snap rolls positive sufficient elevator throw used recovery virtually instantaneous Ive dragged both airplanes nose-high low speed over sky having anything violent mush down speed got too low suggest test Tigerkitten E balance point decide want snappier stall maneuvers move center-of-gravity back between 30% 33% cannot overstress importance doing thorough job preflight testing entire airplane its systems Range-check motor running Use ESV expanded scale voltmeter receiver transmitter batteries beginning flying session Make absolutely certain model balanced aligned warp-free before first flight youll set years rewarding flying Flying Remember start sharp anticipate actions Let airplane build up speed fly off ground fast flat until youre sure what its going Trimmed indicated Tigerkitten E will go essentially point touch positive stability axes Dont afraid blink pay attention stay oriented airplane Tigerkittens seem fD&J ELECTRONICS 900 Lucy Road Howell Michigan 48843 517-546-2644 Service & Repairs Most Radio Control Systems Utilizing Calibrated Test Equipment & Spectrum Analyzer Endorsed AMA RCMA Sticker Station #105 Futaba Airtronics JR Ace HiTec Tower Cirrus World Engines & WE USE GENUINE FACTORY REPLACEMENT PARTS Complete 1991 Narrow Banding & Upgrades RCD / HITEC R/C DEALER Carry Full Line RCD RXs & Products Upgrading. ASK ABOUT THE NEW HOT FOCUS SERIES RADIO CONTROL SYSTEMS FCC Licensed Speed Control Repairs Quality Service Fast Turn Around Shipping & Insurance Extra. UPS Mail VISA / MASTERCARD & DISCOVER WELCOMED AMA #256123ARRLWB8YSQ prefer being brought down little fast side wheel landing attitude mains first tail wheel air rather being three-pointed Once youre ease airplane urge experiment prop/battery combinations am anxious receive input build fly design order establish wider base information power options could ever alone may well 40-size version future fine points design could depend shared experience 05-15 version Good luck think Electric Additional information Stits products available through Bobs Aircraft Supply & Avionics Attention Karen Sandberg Pierce County Airport 17017 Meridian E Puyallup WA 98373 telephone 800331-4375 206-848-9349 Canada Karen Sandberg has agreed make Stits products available direct via mail order quantities modelers use Contact about purchasing copy very complete Stits manual $15 Bill Materials Balsa sheet stock contest grade strip stock light firm 11 /16 x 3 x 36 Two Y16 x 2 x 36 x 2 x 36 4 x 2 x 36 10 Y16-sq x 36 Four A-in sq x 36 Continued page 136 September 1991 135 RENEW 2 See Card Page 99 Foo FIyingS6dac AIoo LondiogGo CIeoConopyAooIobIe B6iIde 86 1255 S6ed 831365 DeI She,d I5 1695 Satisfaction Guaranteedi EAv HINc SH-710 Pkg 24- $295 THE HIGH-TECH HINGE DESIGNED FOR THE CYANOACRYLATE AGE Easier install other hinge No gouging picking messy epoxies Simply cut single knife slot hinge slide hinges place apply few drops favorite CA glue youre done SUPER FAST SUPER EASY SUPER STRONG 7de ea 9e4 foa 6aa SIG MFG CO INC.401-7 So Front StMontezuma IA 50171 623-5154 I ULTIMATESPORT RC 255 EnsI Ahiond/PO Boo 727/Sods Springs idoho 83276 ULIOIAIE ooo sri12085473742EoF~hd,foS,dSASE Eight X V16 X 36 12 / X Yt6 x 36 Eight /16 X x 36 Two x x 36 Two A-in sq x 36 Eight V16 x x 36 Spruce Two A-in sq x 36 Aircraft plywood x 6 x 12 /16 x 12 x 18 / x 6 x 18 Hardware pair 2/s-in Sullivan Skylite wheels Four A-in-dia wheel collars pair Goldberg A-in-dia axle assemblies set Goldberg strip aileron horn assemblies Two small nylon control horns Six 2-56 nylon clevis/rod sets 24-plus servo-mounting sheet metal screws Six 3A x 4-40 allen-head bolts blind nuts Four 3A x 2-56 allen-head bolts locknuts Du-Bro 10-32 nylon wing screw Du-Bro 10-32 brass threaded insert Two small nylon pushrod exit guides 15 small nylon pin-type hinges Du-Bro No 40 tail wheel mount assembly 3A-in tail wheel 2024-T3 x 090-in aluminum alloy appropriate commercial landing gear CB Associates 1 3A-in backplate-type plastic spinner Astro cobalt 05 15 motor system Throttle radio system choice yard 3A-oz fiberglass cloth Covering finish adhesive choice D responding advertisers mention read about Model Aviation RC Helicopters/Jolly Continued page 37 gimbaled Sony color video cam down-link TV transmitter unit super could have some definite industrial rescue applications interested project can contact Juan 415/930-0475 have also playing video-equipped RC aircraft helicopters quite challenge get everything working right comes together oh what picture have understand some great night flying Saturday night Im sorry missed attendance witness Orange County Radio Control Helicopter Association crash crew Kirk Olsen Herb Hoskins Joe Busher putting X Cell 60 back together Evidently switch harness failed during flight Saturday afternoon X-Cell proceeded fly about two minutesapparently mimicking Curtis Youngblood demonstration included inverted flight pirouettesall benefit help transmitter unleashed machine climbed high sky power-dived ground Anyway happy ending Leonard Nitro Alley opened shop crash crew able get parts needed Larry Lloyd Airtronics master radio tech local chopper maniac gave crew Quick Silver fuselage crew patiently watched everyone else fly work Sunday morning late afternoon renovated X-Cell took air flew well before mishap As side note OCRCHA crash crew would like thank Raves RC Products new molded X-Cell tail fins crash crew has completed rigorous field testing finds tail fins absolutely unbreakable through abnonnal usage also ran Gene Engelgau up Bakersfield Gene spending time Larry Lloyd field testing Lightest Pilots Available DARN GOOD AIRMEN Made USAFrom Jennies Jets Pilots Are Best Litelike Latex Rubber Build As Sportsman Barnstormer Bust Pilot KitFull Body Pilot Kit #108 118 acale.$695 #2061/6 scale.$ 995 #106 1/6 scale 205-1/5 scale.1095 #105 1/5 scale #204-1/4 scale.1195 / #104 1/4scale995 #2031/3 scale.1795 #103 1/3 scale.1595 Contains pilot head hands #308 1/8 jet695boots helmet cap goggles #307 1/7 Jet795full templates easy instructions Some simple sewing required Easy Assemble Finish 136 Model Aviation forerunner todays helicopters PCA-2 Pitcairn Autogiro operated regularly commercial firms experimentally US Navy Marines 1/48 WI LLIAMS BROS INC iei PAWNEE ST SAN MARCOS CA 92069619 744-3082 SEND $3 FOR COMPLETE COLOR CATALOG HM Catalog sioonGA DESIGNS Ordering InstructIons See dealer tirst 315 5483779135 East Main StreetDirect orders add $100 P&H NY residents add 70/0 tas FAX 315 5484099Phelps NY 14532 Ds OK