PET SUBJECTS going fo cus next months columns several points Scale RC modeling fall categories pet subjects Im go ing cover Though certainly unique points feel important hope ideas will different enough both inter esting helpful Tail-draggers pet subject number seems high percentage beginning RCers plan eventually becoming involved building flying Scale models Since Scale mod els RCers want fly tail-draggers fol lows RCers should skilled han dling tail-dragger models Unfortunately students learn fly trainers trike-geared Also unfortunately learning take off land trike-geared plane does poor job teaching student handle taildragger especially comes landing However student flies tail-dragger beginning flight training cannot automatically handle trike-geared models also set move typical tail-dragger Scale model Since properly set up tail-dragger trainer just about easy take off slightly harder land trike-geared no reasons beginner shouldnt start taildragger several good reasons he/she should will learning fly using taildragger trainer prepare better going Scale will benefit other ways will make better pilot youll break far fewer props always present challenge mak ing perfect landing especially fully stalled three-point landing will increase fun factor bunch An added bonus building tail-dragger eliminates steerable nose wheel gets way everything up nose plane top nose wheel easily damaged requires much maintenance tail wheel subjects rudder servos gear train other parts lot hard knocks whole secret properly set up tail drag ger get main gear close CG close Im talking two 2/2 Ugly Stik similar size model three four inches larger planes steerable tail wheel 400 500 movement must good ground hand ling steerable tail wheel can driven di rectly rudder separate pushrod rudder servoeither method works fine So go ahead convert trainer sport plane tail-dragger Try youll like proper CG location next item dis cuss especially important center-ofgravity located properly first flight Scale model proper location really mean its too far aft Its amazing certainly sad often learn about beautiful Scale model badly damaged destroyed its first flight because CU too far aft Either builder followed wrong info drawing designer goofed builder goofed got CU too far aft good rule thumb CU location first critical knee-shaking flight have no farther aft 25% mean aerodynamic chord MAC Notice did reference CU leading edge wing often done measurement could rather meaningless thus dangerous accurate safe actu 58 Model Aviation Radio Control Scale Dan Parsons 11809 Fulmer Dr Albuquerque NM 8711 Steve Grays veteran New York-Berlin Bellanca climbout Shortly afterwards mid-aired Fly Baby Bipe destroyed photos month author Dan Parsons Lloyd Roberts unique 102-in-span electric-powered de Havilland Canada Turbo Beaver left Total weight 12 lb Its power pack con sists 28 1 200-mAh Ni-Cd cells flew Odessa winds 20-25 mph no problem right Claude McCulloughs Giant Scale Waco AYN-8 flyby Prototype very unique aircraft After tricycle-geared cabin biplanes have ever seen left Jess Wrights -scale Fairchild PT-22 RCAF markings flyby Yes roundel wing correct position Most iceable difference between PT-22 PT-19 -22s canopy right Gene Thurbers 1/4-scale Porterfleld flies over Odessa TX Steve King picked very beautiful rare exec utive airplane Thirties scale effort Spartan Executive ally easy way measure CG referenced MAC After spending hundreds perhaps thousands hours building magnificent Scale model makes lots sense spend two hours making sure CO safe position first flight Only proper oper ation radio critical proper CO location mean aerodynamic chord can easily de termined graphical means has cov ered several good articles model maga zines over years Im sorry cant reference moment book basic aerody namics would show technique constantchord wing easy since its chord MAC last very important word Before first flight Scale plane always add nose ballast bring CO located too far aft 25% point MAC Never never worry about adding ballast leaving CO too far aft always far better car rying extra weight trying fly CG too far aft critical first flight now its batteries Stories keep ap pearing magazines battery failure usu ally receiver pack still number cause equipment-failure crashes true its real shame because Ni-Cds today prop erly treated cared extremely reliable will last several years Over years have excellent articles model magazines relating care feeding Ni-Cd batteries tend covering ground again t want add point checking batteries Ive never seen mentioned article go step checking health batteries Ive doing years believe its very important step tts simple quick check voltage cell during discharge cycle will pick up weak cell can replace before suddenly goes bad during flight Im talk ing about checking receiver pack since critical cell goes buy made-up receiver packs will have cut away plastic covering pack order get cell voltmeter leads causes no problems youve fin ished checking just wrap pack foam stuff small plastic bag course would good check cell transmitter battery pack too usually sealed tougher cover would fit back transmitter case wrapped foam plastic bag So dont check cell transmitter pack just keep close watch complete pack watch batteries like hawk give re ceiver battery cells quick voltage check under load course after flying session keeps up date condition catches problem before can develop catastrophe final suggestion dont have good dig ital voltmeter get will make checking Continued page 163 Put Fun Back Fun Fly Get ROUN TUIT Today Its round sflat flier 30 Flying DISC STOL SUPERIOR Small Field S FUN FLY Aircraft STABLE PREDICTABLE EtAGILE $43plus s ettipping TX Res add 7% sales tsx VISA Foam ft Lite Ply Construction ELEVON Mixer Included j 25 49 old 3-35 lbs Accurste QUALITY Materials HAS MOVED INTO LARGER QUARTERS 21658 Cloud Way Hayward CA 94545 CAL 415 783-4868 Out CAL 800 482-8663 4 U major decals 024000, announce TATONE PRODUCTS CORPORATION has acquired CB ASSOCIATES PRESIDENT TATONE PRODUCTS CORP.4 L Over 750 Select *7 1/4 Scalet15Sheets *60 Size38Sheets *40 Size35Sheets *Propeller Decals .WT 5 Sheets-3sizes *Kill MarkingsWT onlyt5Sheets * Nonencletore Markings 3 Sizes-12 Sheets Black White copy * Letters Numbers t1/4-3/5-1/2-5/S-3/4-7/g-12344-13/16 10 Colors See color chart * Fleas. tAmerican Uniled Kingdom Confederate * Stars Colors 9 Sizes pbs Sheet Assorted Sizes * Trim Sheets 4-3/4 26 10 Colors see color chart DECALS PRESSURE SENSITIVE R TRANSFER Asthentic model insignias prescore sensitine water transfer tsr 1/4 scale 40 60 r decals size propeller decals World War II kill mark ings stars flags letters numbers trim sheets9S NORTHEAST SCREEN GRAPHICS 2 FISHER AVE EAST LONGMEADOW MA 01026 TEt 4135204110 December 1989 59 MIN Consi Time HOVERABLE Durable UNUSUAL Will NOT Spin donded Model Products Box 10996 Suite 543 Austin TX 78766 512 250-1420 512 444-3368 ONLY Money Back GUARANTEE Business SUCKER-KIT$5995 VHS Show & Tell Video$3995 Add $400 shipping & handling MI residents add 40/0 sales tax Co Sand 3100 BASE product list Cssamples real Wood veneer Skins Product List locludes Gapless Arrow Shall Hinges Carbon Tow Mylar Sheet Eand High-Tech items Co0--c 5 ealer Inquires Welcome CHECK OR MONEY E ORDER TO CO CtS ox 866 Lapeer Ml 48446 313 664-3330 mar units Given results above would seem reason able question ask high must high rate Surely rates between low-speed frame-rate types SC-4 highrate unit produce in-between results Also probably some high-rate value above little performance difference obtained sounds like winter project mefor come future first speed control matter great interest matter non-optically-coupled speed con trols glitching see October 89 MA page 59 get see test fly large number Electrics process experience wide variety flight performance results too often experience case motorinduced glitching recently saw case truly phenomenal level same effect plane unflyable fact ground range motor running measurable tens feet Substituting different radio significantly im proved situation concluded something wrong first radio advised pilot send warranty re pair brand new first asked could try something Since speed control case optically coupled wanted try separate speed control receiver radio frequencies installed three small chokes three speed-control-toreceiver leads effectively broke radio/speed control connection radio frequency DC servo-pulse-signal condi tions worked just great plane perfectly flyable what still believe defective radio Since success two other systems per formed normally meaning somewhat glitchy flyable similarly modified good results normal glitching reduced significantly sounds like some thing would useful 10microhenry chokes available Ace R/C Inc part #LL106 SOC photo herein shows installing cannot assure same success ra dio speed control power system can find out yourself few bucks lit tle time now speed control item up coming new big-motor unit soon announced S ES MILLS MET5LS 500KS PRECISI0s INST5YIE5TS C0NLETE 5T5LOG $200 Ku IbIs 1t,S 4MPIIU GLf c 2100 C S1,s Rooc Spr,gfo1d 1ioo 45505 Compac3 13 322-8562 Jomar intended use 24 32 cells dont have release date price writing Interest can call write Jomar see ad magazine get prompt reliable accu rate answer goes service too could name some places hobby doesnt happenbut wont dont ask either Electric supplies available littleknown source SR Batteries Its SR lit tIe known indeed very well knownbut batteries fact SR can supply wide range Electric goodies including Astro Jomar Robbe KSC other name brands discount prices addition popular SR batteries latter bring quite bit reader mail espe cially high-capacity Magnums seems readers have really taken liking l250sa cell specified 1250 mAb capac ity physical size nominal weight familiar 800 ARs Ive some interesting correspondence Larry Sribnick chief charge arry tells wont tell anyone else just what cell-secrets Larry maintains proprietary info regarding suppliers processes cant blame him Its se cret success Anyway case youre aware Larry will make up custom battery packs re quirements Check SR ad issue send note get SR catalog tells except secrets As closing note remember Electrics work just great winter its very easy keep em clean low temperatures cause theres no thick sticky goo wipe off plane Happy quiet Electric landings everyone RC Scale/Parsons Continued page 59 batteries much easier quicker ac curate old-style analog voltmeter Beckman Circuitmate DM15B compact high quality has good ranges fac tors make ideal both workshop field box paid around 60 bucks about five years ago RC Helicopters/Jolly Continued page 60 special new feature Rebel hi-tech composite rotor head After much designing ex perimenting flight testing GMP has devel oped unique rotor head offers utmost simplicity performance new rotor head consists one-piece ny lon center unit dual-ball-bearing-supported hub Hiller flybar control pivots nylon center unit Prebent blade holders automatically adjust main rotor blade pitch optimum setting Hence Rebel very easy set up has fewest parts count rotor head market provides lots inherent static stability maintaining very adequate acro batic capability main rotor blades specifically designed matched maximize flight performance Rebel combination unique airfoil blade chord dimensions has produced flight re sponse very conducive learning tly quickly little no damage model Cyclic control soft yet responsive Altitude control normally less effective other fixed-pitch Helicopters much improved Rebel climbs descends ease precision improved altitude control re sult extensive research testing led simple yet very effective rotor blade head design standard starting system Rebel cone start now demanded discriminating mod elers worldwide greatly eases starting process eliminates problems can arise starting belt-type system Rebel however OMP has developed sys tem further accommodate airplane fliers special adapter electric starter no longer needed Rebel designed use standard airplane starter cone fit ted electric starters However rub ber insert may need reversed smaller opening engages Rebels starting cone clutch classic GMP standard one-piece design machined steel plastic pro vides superior reliable performance GMP clutch unit times expensive manufacture other plastic some twopiece metal clutches available today gives smoother engagement drive performance lasts virtually forever clutch bell fitted special lining individually factoryfitted particular OMP kit provide cor rect engagement reliable operating perform ance will buy Rebel aimed toward Continued page 167 December 1989 163 BLUES CA getting down get protected CA mask Safety Plus mask will eliminate CA fumes epoxy polyester resin vapors air breath Lightweight easy breathing comfortable CA Mask $1595 Paint Mask $2045 See hobby dealer first doesnt have what need order direct Safety Plus PO Box 1173 Dept 12M Clinton Mississippi 39056 Call toll free 1-800-842-7233 Mississippi dial 601-924-9640 VISA MASTERCARD accepted COD add $250 shipping handling included Dealer Inquiries Invited PLU5 Bob FiorenzeI Hobby Center Inc Dealer Yellow Aircraft Complete Line Mail Order Hobby Suppliex Now available Faatcover Covering Material Welt Shownoom 35 mm Dextey woridl Omegaleool Power Fuela Diacountad Z 420 W.t SR 434--407 3274353 Winter Spdnga FL 32708 'Fax 407 327-7148 FOAM CORE FLOATS PLANS AND KITS WE OFFER SELECTION OF FLOAT PLANS AND KITS FOR 4 12 POUND AIRPLANES WITH V HULL lESION IN USE SIIWE 1972 SEND SASE FOR CATALOG SHEET KIRCHER R/C PRODUCTS INC 9 SHEFFIELD WAY CLARK NJ 07066
Edition: Model Aviation - 1989/12
Page Numbers: 58, 59, 163
PET SUBJECTS going fo cus next months columns several points Scale RC modeling fall categories pet subjects Im go ing cover Though certainly unique points feel important hope ideas will different enough both inter esting helpful Tail-draggers pet subject number seems high percentage beginning RCers plan eventually becoming involved building flying Scale models Since Scale mod els RCers want fly tail-draggers fol lows RCers should skilled han dling tail-dragger models Unfortunately students learn fly trainers trike-geared Also unfortunately learning take off land trike-geared plane does poor job teaching student handle taildragger especially comes landing However student flies tail-dragger beginning flight training cannot automatically handle trike-geared models also set move typical tail-dragger Scale model Since properly set up tail-dragger trainer just about easy take off slightly harder land trike-geared no reasons beginner shouldnt start taildragger several good reasons he/she should will learning fly using taildragger trainer prepare better going Scale will benefit other ways will make better pilot youll break far fewer props always present challenge mak ing perfect landing especially fully stalled three-point landing will increase fun factor bunch An added bonus building tail-dragger eliminates steerable nose wheel gets way everything up nose plane top nose wheel easily damaged requires much maintenance tail wheel subjects rudder servos gear train other parts lot hard knocks whole secret properly set up tail drag ger get main gear close CG close Im talking two 2/2 Ugly Stik similar size model three four inches larger planes steerable tail wheel 400 500 movement must good ground hand ling steerable tail wheel can driven di rectly rudder separate pushrod rudder servoeither method works fine So go ahead convert trainer sport plane tail-dragger Try youll like proper CG location next item dis cuss especially important center-ofgravity located properly first flight Scale model proper location really mean its too far aft Its amazing certainly sad often learn about beautiful Scale model badly damaged destroyed its first flight because CU too far aft Either builder followed wrong info drawing designer goofed builder goofed got CU too far aft good rule thumb CU location first critical knee-shaking flight have no farther aft 25% mean aerodynamic chord MAC Notice did reference CU leading edge wing often done measurement could rather meaningless thus dangerous accurate safe actu 58 Model Aviation Radio Control Scale Dan Parsons 11809 Fulmer Dr Albuquerque NM 8711 Steve Grays veteran New York-Berlin Bellanca climbout Shortly afterwards mid-aired Fly Baby Bipe destroyed photos month author Dan Parsons Lloyd Roberts unique 102-in-span electric-powered de Havilland Canada Turbo Beaver left Total weight 12 lb Its power pack con sists 28 1 200-mAh Ni-Cd cells flew Odessa winds 20-25 mph no problem right Claude McCulloughs Giant Scale Waco AYN-8 flyby Prototype very unique aircraft After tricycle-geared cabin biplanes have ever seen left Jess Wrights -scale Fairchild PT-22 RCAF markings flyby Yes roundel wing correct position Most iceable difference between PT-22 PT-19 -22s canopy right Gene Thurbers 1/4-scale Porterfleld flies over Odessa TX Steve King picked very beautiful rare exec utive airplane Thirties scale effort Spartan Executive ally easy way measure CG referenced MAC After spending hundreds perhaps thousands hours building magnificent Scale model makes lots sense spend two hours making sure CO safe position first flight Only proper oper ation radio critical proper CO location mean aerodynamic chord can easily de termined graphical means has cov ered several good articles model maga zines over years Im sorry cant reference moment book basic aerody namics would show technique constantchord wing easy since its chord MAC last very important word Before first flight Scale plane always add nose ballast bring CO located too far aft 25% point MAC Never never worry about adding ballast leaving CO too far aft always far better car rying extra weight trying fly CG too far aft critical first flight now its batteries Stories keep ap pearing magazines battery failure usu ally receiver pack still number cause equipment-failure crashes true its real shame because Ni-Cds today prop erly treated cared extremely reliable will last several years Over years have excellent articles model magazines relating care feeding Ni-Cd batteries tend covering ground again t want add point checking batteries Ive never seen mentioned article go step checking health batteries Ive doing years believe its very important step tts simple quick check voltage cell during discharge cycle will pick up weak cell can replace before suddenly goes bad during flight Im talk ing about checking receiver pack since critical cell goes buy made-up receiver packs will have cut away plastic covering pack order get cell voltmeter leads causes no problems youve fin ished checking just wrap pack foam stuff small plastic bag course would good check cell transmitter battery pack too usually sealed tougher cover would fit back transmitter case wrapped foam plastic bag So dont check cell transmitter pack just keep close watch complete pack watch batteries like hawk give re ceiver battery cells quick voltage check under load course after flying session keeps up date condition catches problem before can develop catastrophe final suggestion dont have good dig ital voltmeter get will make checking Continued page 163 Put Fun Back Fun Fly Get ROUN TUIT Today Its round sflat flier 30 Flying DISC STOL SUPERIOR Small Field S FUN FLY Aircraft STABLE PREDICTABLE EtAGILE $43plus s ettipping TX Res add 7% sales tsx VISA Foam ft Lite Ply Construction ELEVON Mixer Included j 25 49 old 3-35 lbs Accurste QUALITY Materials HAS MOVED INTO LARGER QUARTERS 21658 Cloud Way Hayward CA 94545 CAL 415 783-4868 Out CAL 800 482-8663 4 U major decals 024000, announce TATONE PRODUCTS CORPORATION has acquired CB ASSOCIATES PRESIDENT TATONE PRODUCTS CORP.4 L Over 750 Select *7 1/4 Scalet15Sheets *60 Size38Sheets *40 Size35Sheets *Propeller Decals .WT 5 Sheets-3sizes *Kill MarkingsWT onlyt5Sheets * Nonencletore Markings 3 Sizes-12 Sheets Black White copy * Letters Numbers t1/4-3/5-1/2-5/S-3/4-7/g-12344-13/16 10 Colors See color chart * Fleas. tAmerican Uniled Kingdom Confederate * Stars Colors 9 Sizes pbs Sheet Assorted Sizes * Trim Sheets 4-3/4 26 10 Colors see color chart DECALS PRESSURE SENSITIVE R TRANSFER Asthentic model insignias prescore sensitine water transfer tsr 1/4 scale 40 60 r decals size propeller decals World War II kill mark ings stars flags letters numbers trim sheets9S NORTHEAST SCREEN GRAPHICS 2 FISHER AVE EAST LONGMEADOW MA 01026 TEt 4135204110 December 1989 59 MIN Consi Time HOVERABLE Durable UNUSUAL Will NOT Spin donded Model Products Box 10996 Suite 543 Austin TX 78766 512 250-1420 512 444-3368 ONLY Money Back GUARANTEE Business SUCKER-KIT$5995 VHS Show & Tell Video$3995 Add $400 shipping & handling MI residents add 40/0 sales tax Co Sand 3100 BASE product list Cssamples real Wood veneer Skins Product List locludes Gapless Arrow Shall Hinges Carbon Tow Mylar Sheet Eand High-Tech items Co0--c 5 ealer Inquires Welcome CHECK OR MONEY E ORDER TO CO CtS ox 866 Lapeer Ml 48446 313 664-3330 mar units Given results above would seem reason able question ask high must high rate Surely rates between low-speed frame-rate types SC-4 highrate unit produce in-between results Also probably some high-rate value above little performance difference obtained sounds like winter project mefor come future first speed control matter great interest matter non-optically-coupled speed con trols glitching see October 89 MA page 59 get see test fly large number Electrics process experience wide variety flight performance results too often experience case motorinduced glitching recently saw case truly phenomenal level same effect plane unflyable fact ground range motor running measurable tens feet Substituting different radio significantly im proved situation concluded something wrong first radio advised pilot send warranty re pair brand new first asked could try something Since speed control case optically coupled wanted try separate speed control receiver radio frequencies installed three small chokes three speed-control-toreceiver leads effectively broke radio/speed control connection radio frequency DC servo-pulse-signal condi tions worked just great plane perfectly flyable what still believe defective radio Since success two other systems per formed normally meaning somewhat glitchy flyable similarly modified good results normal glitching reduced significantly sounds like some thing would useful 10microhenry chokes available Ace R/C Inc part #LL106 SOC photo herein shows installing cannot assure same success ra dio speed control power system can find out yourself few bucks lit tle time now speed control item up coming new big-motor unit soon announced S ES MILLS MET5LS 500KS PRECISI0s INST5YIE5TS C0NLETE 5T5LOG $200 Ku IbIs 1t,S 4MPIIU GLf c 2100 C S1,s Rooc Spr,gfo1d 1ioo 45505 Compac3 13 322-8562 Jomar intended use 24 32 cells dont have release date price writing Interest can call write Jomar see ad magazine get prompt reliable accu rate answer goes service too could name some places hobby doesnt happenbut wont dont ask either Electric supplies available littleknown source SR Batteries Its SR lit tIe known indeed very well knownbut batteries fact SR can supply wide range Electric goodies including Astro Jomar Robbe KSC other name brands discount prices addition popular SR batteries latter bring quite bit reader mail espe cially high-capacity Magnums seems readers have really taken liking l250sa cell specified 1250 mAb capac ity physical size nominal weight familiar 800 ARs Ive some interesting correspondence Larry Sribnick chief charge arry tells wont tell anyone else just what cell-secrets Larry maintains proprietary info regarding suppliers processes cant blame him Its se cret success Anyway case youre aware Larry will make up custom battery packs re quirements Check SR ad issue send note get SR catalog tells except secrets As closing note remember Electrics work just great winter its very easy keep em clean low temperatures cause theres no thick sticky goo wipe off plane Happy quiet Electric landings everyone RC Scale/Parsons Continued page 59 batteries much easier quicker ac curate old-style analog voltmeter Beckman Circuitmate DM15B compact high quality has good ranges fac tors make ideal both workshop field box paid around 60 bucks about five years ago RC Helicopters/Jolly Continued page 60 special new feature Rebel hi-tech composite rotor head After much designing ex perimenting flight testing GMP has devel oped unique rotor head offers utmost simplicity performance new rotor head consists one-piece ny lon center unit dual-ball-bearing-supported hub Hiller flybar control pivots nylon center unit Prebent blade holders automatically adjust main rotor blade pitch optimum setting Hence Rebel very easy set up has fewest parts count rotor head market provides lots inherent static stability maintaining very adequate acro batic capability main rotor blades specifically designed matched maximize flight performance Rebel combination unique airfoil blade chord dimensions has produced flight re sponse very conducive learning tly quickly little no damage model Cyclic control soft yet responsive Altitude control normally less effective other fixed-pitch Helicopters much improved Rebel climbs descends ease precision improved altitude control re sult extensive research testing led simple yet very effective rotor blade head design standard starting system Rebel cone start now demanded discriminating mod elers worldwide greatly eases starting process eliminates problems can arise starting belt-type system Rebel however OMP has developed sys tem further accommodate airplane fliers special adapter electric starter no longer needed Rebel designed use standard airplane starter cone fit ted electric starters However rub ber insert may need reversed smaller opening engages Rebels starting cone clutch classic GMP standard one-piece design machined steel plastic pro vides superior reliable performance GMP clutch unit times expensive manufacture other plastic some twopiece metal clutches available today gives smoother engagement drive performance lasts virtually forever clutch bell fitted special lining individually factoryfitted particular OMP kit provide cor rect engagement reliable operating perform ance will buy Rebel aimed toward Continued page 167 December 1989 163 BLUES CA getting down get protected CA mask Safety Plus mask will eliminate CA fumes epoxy polyester resin vapors air breath Lightweight easy breathing comfortable CA Mask $1595 Paint Mask $2045 See hobby dealer first doesnt have what need order direct Safety Plus PO Box 1173 Dept 12M Clinton Mississippi 39056 Call toll free 1-800-842-7233 Mississippi dial 601-924-9640 VISA MASTERCARD accepted COD add $250 shipping handling included Dealer Inquiries Invited PLU5 Bob FiorenzeI Hobby Center Inc Dealer Yellow Aircraft Complete Line Mail Order Hobby Suppliex Now available Faatcover Covering Material Welt Shownoom 35 mm Dextey woridl Omegaleool Power Fuela Diacountad Z 420 W.t SR 434--407 3274353 Winter Spdnga FL 32708 'Fax 407 327-7148 FOAM CORE FLOATS PLANS AND KITS WE OFFER SELECTION OF FLOAT PLANS AND KITS FOR 4 12 POUND AIRPLANES WITH V HULL lESION IN USE SIIWE 1972 SEND SASE FOR CATALOG SHEET KIRCHER R/C PRODUCTS INC 9 SHEFFIELD WAY CLARK NJ 07066
Edition: Model Aviation - 1989/12
Page Numbers: 58, 59, 163
PET SUBJECTS going fo cus next months columns several points Scale RC modeling fall categories pet subjects Im go ing cover Though certainly unique points feel important hope ideas will different enough both inter esting helpful Tail-draggers pet subject number seems high percentage beginning RCers plan eventually becoming involved building flying Scale models Since Scale mod els RCers want fly tail-draggers fol lows RCers should skilled han dling tail-dragger models Unfortunately students learn fly trainers trike-geared Also unfortunately learning take off land trike-geared plane does poor job teaching student handle taildragger especially comes landing However student flies tail-dragger beginning flight training cannot automatically handle trike-geared models also set move typical tail-dragger Scale model Since properly set up tail-dragger trainer just about easy take off slightly harder land trike-geared no reasons beginner shouldnt start taildragger several good reasons he/she should will learning fly using taildragger trainer prepare better going Scale will benefit other ways will make better pilot youll break far fewer props always present challenge mak ing perfect landing especially fully stalled three-point landing will increase fun factor bunch An added bonus building tail-dragger eliminates steerable nose wheel gets way everything up nose plane top nose wheel easily damaged requires much maintenance tail wheel subjects rudder servos gear train other parts lot hard knocks whole secret properly set up tail drag ger get main gear close CG close Im talking two 2/2 Ugly Stik similar size model three four inches larger planes steerable tail wheel 400 500 movement must good ground hand ling steerable tail wheel can driven di rectly rudder separate pushrod rudder servoeither method works fine So go ahead convert trainer sport plane tail-dragger Try youll like proper CG location next item dis cuss especially important center-ofgravity located properly first flight Scale model proper location really mean its too far aft Its amazing certainly sad often learn about beautiful Scale model badly damaged destroyed its first flight because CU too far aft Either builder followed wrong info drawing designer goofed builder goofed got CU too far aft good rule thumb CU location first critical knee-shaking flight have no farther aft 25% mean aerodynamic chord MAC Notice did reference CU leading edge wing often done measurement could rather meaningless thus dangerous accurate safe actu 58 Model Aviation Radio Control Scale Dan Parsons 11809 Fulmer Dr Albuquerque NM 8711 Steve Grays veteran New York-Berlin Bellanca climbout Shortly afterwards mid-aired Fly Baby Bipe destroyed photos month author Dan Parsons Lloyd Roberts unique 102-in-span electric-powered de Havilland Canada Turbo Beaver left Total weight 12 lb Its power pack con sists 28 1 200-mAh Ni-Cd cells flew Odessa winds 20-25 mph no problem right Claude McCulloughs Giant Scale Waco AYN-8 flyby Prototype very unique aircraft After tricycle-geared cabin biplanes have ever seen left Jess Wrights -scale Fairchild PT-22 RCAF markings flyby Yes roundel wing correct position Most iceable difference between PT-22 PT-19 -22s canopy right Gene Thurbers 1/4-scale Porterfleld flies over Odessa TX Steve King picked very beautiful rare exec utive airplane Thirties scale effort Spartan Executive ally easy way measure CG referenced MAC After spending hundreds perhaps thousands hours building magnificent Scale model makes lots sense spend two hours making sure CO safe position first flight Only proper oper ation radio critical proper CO location mean aerodynamic chord can easily de termined graphical means has cov ered several good articles model maga zines over years Im sorry cant reference moment book basic aerody namics would show technique constantchord wing easy since its chord MAC last very important word Before first flight Scale plane always add nose ballast bring CO located too far aft 25% point MAC Never never worry about adding ballast leaving CO too far aft always far better car rying extra weight trying fly CG too far aft critical first flight now its batteries Stories keep ap pearing magazines battery failure usu ally receiver pack still number cause equipment-failure crashes true its real shame because Ni-Cds today prop erly treated cared extremely reliable will last several years Over years have excellent articles model magazines relating care feeding Ni-Cd batteries tend covering ground again t want add point checking batteries Ive never seen mentioned article go step checking health batteries Ive doing years believe its very important step tts simple quick check voltage cell during discharge cycle will pick up weak cell can replace before suddenly goes bad during flight Im talk ing about checking receiver pack since critical cell goes buy made-up receiver packs will have cut away plastic covering pack order get cell voltmeter leads causes no problems youve fin ished checking just wrap pack foam stuff small plastic bag course would good check cell transmitter battery pack too usually sealed tougher cover would fit back transmitter case wrapped foam plastic bag So dont check cell transmitter pack just keep close watch complete pack watch batteries like hawk give re ceiver battery cells quick voltage check under load course after flying session keeps up date condition catches problem before can develop catastrophe final suggestion dont have good dig ital voltmeter get will make checking Continued page 163 Put Fun Back Fun Fly Get ROUN TUIT Today Its round sflat flier 30 Flying DISC STOL SUPERIOR Small Field S FUN FLY Aircraft STABLE PREDICTABLE EtAGILE $43plus s ettipping TX Res add 7% sales tsx VISA Foam ft Lite Ply Construction ELEVON Mixer Included j 25 49 old 3-35 lbs Accurste QUALITY Materials HAS MOVED INTO LARGER QUARTERS 21658 Cloud Way Hayward CA 94545 CAL 415 783-4868 Out CAL 800 482-8663 4 U major decals 024000, announce TATONE PRODUCTS CORPORATION has acquired CB ASSOCIATES PRESIDENT TATONE PRODUCTS CORP.4 L Over 750 Select *7 1/4 Scalet15Sheets *60 Size38Sheets *40 Size35Sheets *Propeller Decals .WT 5 Sheets-3sizes *Kill MarkingsWT onlyt5Sheets * Nonencletore Markings 3 Sizes-12 Sheets Black White copy * Letters Numbers t1/4-3/5-1/2-5/S-3/4-7/g-12344-13/16 10 Colors See color chart * Fleas. tAmerican Uniled Kingdom Confederate * Stars Colors 9 Sizes pbs Sheet Assorted Sizes * Trim Sheets 4-3/4 26 10 Colors see color chart DECALS PRESSURE SENSITIVE R TRANSFER Asthentic model insignias prescore sensitine water transfer tsr 1/4 scale 40 60 r decals size propeller decals World War II kill mark ings stars flags letters numbers trim sheets9S NORTHEAST SCREEN GRAPHICS 2 FISHER AVE EAST LONGMEADOW MA 01026 TEt 4135204110 December 1989 59 MIN Consi Time HOVERABLE Durable UNUSUAL Will NOT Spin donded Model Products Box 10996 Suite 543 Austin TX 78766 512 250-1420 512 444-3368 ONLY Money Back GUARANTEE Business SUCKER-KIT$5995 VHS Show & Tell Video$3995 Add $400 shipping & handling MI residents add 40/0 sales tax Co Sand 3100 BASE product list Cssamples real Wood veneer Skins Product List locludes Gapless Arrow Shall Hinges Carbon Tow Mylar Sheet Eand High-Tech items Co0--c 5 ealer Inquires Welcome CHECK OR MONEY E ORDER TO CO CtS ox 866 Lapeer Ml 48446 313 664-3330 mar units Given results above would seem reason able question ask high must high rate Surely rates between low-speed frame-rate types SC-4 highrate unit produce in-between results Also probably some high-rate value above little performance difference obtained sounds like winter project mefor come future first speed control matter great interest matter non-optically-coupled speed con trols glitching see October 89 MA page 59 get see test fly large number Electrics process experience wide variety flight performance results too often experience case motorinduced glitching recently saw case truly phenomenal level same effect plane unflyable fact ground range motor running measurable tens feet Substituting different radio significantly im proved situation concluded something wrong first radio advised pilot send warranty re pair brand new first asked could try something Since speed control case optically coupled wanted try separate speed control receiver radio frequencies installed three small chokes three speed-control-toreceiver leads effectively broke radio/speed control connection radio frequency DC servo-pulse-signal condi tions worked just great plane perfectly flyable what still believe defective radio Since success two other systems per formed normally meaning somewhat glitchy flyable similarly modified good results normal glitching reduced significantly sounds like some thing would useful 10microhenry chokes available Ace R/C Inc part #LL106 SOC photo herein shows installing cannot assure same success ra dio speed control power system can find out yourself few bucks lit tle time now speed control item up coming new big-motor unit soon announced S ES MILLS MET5LS 500KS PRECISI0s INST5YIE5TS C0NLETE 5T5LOG $200 Ku IbIs 1t,S 4MPIIU GLf c 2100 C S1,s Rooc Spr,gfo1d 1ioo 45505 Compac3 13 322-8562 Jomar intended use 24 32 cells dont have release date price writing Interest can call write Jomar see ad magazine get prompt reliable accu rate answer goes service too could name some places hobby doesnt happenbut wont dont ask either Electric supplies available littleknown source SR Batteries Its SR lit tIe known indeed very well knownbut batteries fact SR can supply wide range Electric goodies including Astro Jomar Robbe KSC other name brands discount prices addition popular SR batteries latter bring quite bit reader mail espe cially high-capacity Magnums seems readers have really taken liking l250sa cell specified 1250 mAb capac ity physical size nominal weight familiar 800 ARs Ive some interesting correspondence Larry Sribnick chief charge arry tells wont tell anyone else just what cell-secrets Larry maintains proprietary info regarding suppliers processes cant blame him Its se cret success Anyway case youre aware Larry will make up custom battery packs re quirements Check SR ad issue send note get SR catalog tells except secrets As closing note remember Electrics work just great winter its very easy keep em clean low temperatures cause theres no thick sticky goo wipe off plane Happy quiet Electric landings everyone RC Scale/Parsons Continued page 59 batteries much easier quicker ac curate old-style analog voltmeter Beckman Circuitmate DM15B compact high quality has good ranges fac tors make ideal both workshop field box paid around 60 bucks about five years ago RC Helicopters/Jolly Continued page 60 special new feature Rebel hi-tech composite rotor head After much designing ex perimenting flight testing GMP has devel oped unique rotor head offers utmost simplicity performance new rotor head consists one-piece ny lon center unit dual-ball-bearing-supported hub Hiller flybar control pivots nylon center unit Prebent blade holders automatically adjust main rotor blade pitch optimum setting Hence Rebel very easy set up has fewest parts count rotor head market provides lots inherent static stability maintaining very adequate acro batic capability main rotor blades specifically designed matched maximize flight performance Rebel combination unique airfoil blade chord dimensions has produced flight re sponse very conducive learning tly quickly little no damage model Cyclic control soft yet responsive Altitude control normally less effective other fixed-pitch Helicopters much improved Rebel climbs descends ease precision improved altitude control re sult extensive research testing led simple yet very effective rotor blade head design standard starting system Rebel cone start now demanded discriminating mod elers worldwide greatly eases starting process eliminates problems can arise starting belt-type system Rebel however OMP has developed sys tem further accommodate airplane fliers special adapter electric starter no longer needed Rebel designed use standard airplane starter cone fit ted electric starters However rub ber insert may need reversed smaller opening engages Rebels starting cone clutch classic GMP standard one-piece design machined steel plastic pro vides superior reliable performance GMP clutch unit times expensive manufacture other plastic some twopiece metal clutches available today gives smoother engagement drive performance lasts virtually forever clutch bell fitted special lining individually factoryfitted particular OMP kit provide cor rect engagement reliable operating perform ance will buy Rebel aimed toward Continued page 167 December 1989 163 BLUES CA getting down get protected CA mask Safety Plus mask will eliminate CA fumes epoxy polyester resin vapors air breath Lightweight easy breathing comfortable CA Mask $1595 Paint Mask $2045 See hobby dealer first doesnt have what need order direct Safety Plus PO Box 1173 Dept 12M Clinton Mississippi 39056 Call toll free 1-800-842-7233 Mississippi dial 601-924-9640 VISA MASTERCARD accepted COD add $250 shipping handling included Dealer Inquiries Invited PLU5 Bob FiorenzeI Hobby Center Inc Dealer Yellow Aircraft Complete Line Mail Order Hobby Suppliex Now available Faatcover Covering Material Welt Shownoom 35 mm Dextey woridl Omegaleool Power Fuela Diacountad Z 420 W.t SR 434--407 3274353 Winter Spdnga FL 32708 'Fax 407 327-7148 FOAM CORE FLOATS PLANS AND KITS WE OFFER SELECTION OF FLOAT PLANS AND KITS FOR 4 12 POUND AIRPLANES WITH V HULL lESION IN USE SIIWE 1972 SEND SASE FOR CATALOG SHEET KIRCHER R/C PRODUCTS INC 9 SHEFFIELD WAY CLARK NJ 07066