THIS may seem like just another issue marks beginning fifth year columnist ModelAviation little four years ago publisher Carl Wheeley startled devil out calling ask would consider writing column Little did expect Id still doing now reasons has possible continue long bulky packages AMA Headquarters sends contaming club newsletters over country ideas excerpts inspi ration draw big help Another major assistance get letters sent readers comments reports suggestions photographs make job easier provide column lot would possible come up own also get letters asking assistance Most time can provide help myself know someone can recently got Ed Kirtley Bowling Green Kentucky referred Steve Helms K/C South Ed needs header pipe mates Webra Speed 61 OPS tuned pipe Since question probably general interest Steves response Webra no longer makes header pipe Speed 61 However HB makes both 2 3 elbow 2 elbow used upright engines pipe goes over top wing 3 elbow used side-mounted engines pipe goes below wing Ac cording Steve Macs also sells headers Speed 6 hOPS pipe combination hard get another letter just arrived Major Dick Cline Sierra Vista Arizona sug gests about Pattern Problem Monthsubmitted readers winning entry month receive some fabulous prize like broken 11 X 7 3/4 Zinger prop autographed pattern pilot choice problem let guy name exactly what Continued page 111 36 Model Aviation After Bob Christophers Hornet ate tail off Chuck Shades sistership Western Ohio Radio Kontrol SocietyA races pilot walked away carnage otherwent land Looking like cat ate canary Bobwe presume Shade Plc Good things come small packages Jim Prells Chickadee 1 /2A pattern ship features two-channel Ace tapered Ace foam wing Entire model Solaiflim coverediower temperature iron-on works OK over foam Right Both aileron eievator servos mounted wing elevator servo being accessible through top hatch Doubting Thomass please copy Half pattern absolutely practical Larry Kruse pix lective pushrod connections servo shown per Americans instruc tions made piggy-back servo arm standard arm two bushings discarded Robart servo two 2-56 screws nuts throttle pushrod top arm collective beneath may follow similar installation follow Americans instruc tions main rotor blade assembly notes regarding trimming blades length may misleading beginner trim blades length instruc tions call trimming root end ap proximately 1/16 measuring ex actly 21 root end blade achieve blades equal length Id recommend after cutting 1/16 off root ends closest end mounting holes blades fastened together blade top other using two 4-40x1 screws nuts through mounting holes cut 21 mark measured root top blade both blades cut together com mon reference being attachment points sure glass 4 roots blade per instructions didnt encounter problems rotor-head construction lead-lag ad justment coning-angle adjustment covered pages 8 9 10 tighten 5-40x1 bolt head must teeter limited dampener tubing during adjustment coning angle finally helicopter flown Install radio equipment liking reference instructions page 10 Radio Pushrod stallation through remainder factorys instructions notes check lists excellent American R/C really impressed detail re garding pushrod installation pre flight set-up Before first flight Com mander required two packages Pra ther Products Stick-On Weights 12 oz nose balance helicopter recommended Center Gravity Adding much weight disap pointing probably due choice light weight airborne battery pack location airborne sys tem used Ace R/C Digital Com mander receiver converted negative pulse four Pro-Line PLS-l 2 servos complete airborne system easily installed under seat Am erican R/C recommends battery pack installed forward seat couldnt resist hiding Hovering Commander should present particular problems Like helicopter similar aerobatic capabilities control response immedi ate first flights winds gust ing 20 knots machine behaved quite well tail rotor mixer date have flown Commander fast forward flight done aerobatics Im sure capable As mentioned earlier Command er may fitted autorotation device see photo modification kit consists basically replacement ny lon gear uni-directional bearing replacement bearing block has relieved accept addition one-way bearing gear ltest Commander fuselage side plates have drilled factory ac cept modification retro-fit standard Commander main ro tor blades must also replaced included model kit use autorotation device allows main rotor windmill event engine failure planned engine shut-down Since tail rotor drive via direct belt drive engine turning during autorotation main rotor pilot has control cy clic main rotor collective pitch tail rotor no longer necessary anti-torque function anyway autorotation device neat sys tem ability autorotate likely immedintely benefit rank beginner since beginners practice should altitude blade inertia alone will get helicop ter ground minimal damage advanced helicopter fliers wanting autorotation capability may de sire modification potential saving helicopter crashes due engine failure just provide new maneuver practice cer tainly degree skill necessary properly perform autorotation down soft landing device has proven itself re cent Tangerine several Ameri can R/C Helicopter Team demonstrated successful engine-out landings alti tudes 75 300 feet look forward trying autorotations soon will comment further time Gone flying Commander See next month Tbe AMA Nats arent far off folks scan Competition Newsletter section latest April issue Model viat ion has preliminaries late entry fee year $5000 Dave Chesney Rt 9 Box 621A Greensboro NC 27409 RC Aerobatics/Van Putte continued page 36 giving him troubleand other expert can con helping will answer question think Dick has great idea am willing give try Just case receptive Dick included two problems Ill give first shot month 10-6 9 7 Nashville Slow 8- 8 Gillopt 8 8 Regular 8-7 Regular 7 6 7 55 KELLY PROPS Winningest Fiberglas Graphite Propellers U S Nationals $650 Rat $650 $500 $475 $475 $375 Graphite $500 6% 5% Willoughby $375 Graphite $500 6 7/8 52 Anderson Ballard Latest Version Mk-3 $375 Graphite $500 7 4 FAI Combat Prop $375 Team Race Props DRAZEK NOVA JOHN GRAY Fiber $375 Graphite $500 ODDY ONE BLADE PROP W/out Counter Balence Fiber $400 Graphite $500 ORDER DIRECT 72 hour shipping cashiers checks money orders 10-day personal checks Money promptly refunded prop stock See Winston-Salem KELLY PRODUCTS NC P0 BOX 38 WESTERN SPRINGS IL 60558 June1979 111 DiCK MATHIS TRYING TO SET RIC FLYiNG BACK 43 YEARS HERES PAiR OF 1936 BEAUTiES FOR OLD TiMER FANS N-FOOT QUAKER $5500 NINE-FOOT VALLAIRE $6500 DICK MATHiS DESIGN GROUP BOX 338 LONE OAK TX 75453 PHONE 214/662-5326 Embryo Model RIE IRD#ISo $395Complete 79 Catalog sioolR EPLOTECH 16 WINGSPANGUIDE OF RUBBER MODEL SUPPLIESJINTERNATI0NAL INC PO BOX 2490-MA46500 MC KENZIE HWY pPLANS LA MESA CALIF 92041VIDA O9EQON 97469 try second next month So winning entry first monthly Pattern Problem Month have Airborne Associates Phoenix 6 OS6O F SR/pump CG front-to-back has checked both ground air appears okay plane balanced side-to-side wing engine stab 00 according Robart gauge Inside Loops superno falling off problem Outside Loops Almost Outside Loop has aborted plane tucks wing seems perform half roll problem could caused several things aileron gap wing warp aileron/rudder trim mismatch split elevator unequal movement pilot input forced say further information Id say probably due unequal aileron gap However look above potential causes might helpful Most airplanes perform tighter outside loops inside loops given amount elevator deflection pattern fliers adjust elevator travel achieve up elevator down elevator equal control stick deflection about neutral Consequently since natural move stick about same amount loops outside loops much smaller inside loops particularly true Phoenix 6 airplanes have flown reason always obtain some elevator dif ferential allowing servo arm neutral point rotated about 350 400 straight across servo elevator moves up moves down given stick deflection does aileron gap cause problems what does elevator differential have Well flier has airplane does tighter outside loops inside loops same stick movement wing will working harder develop lift perform outside loops Unless perfectly matched gap both ailerons wing will allow air leak through gap other will result unequal lift wings corresponding rolling tendency airplane out side loop maneuver aileron gap effect will have greatest effect since wing loading higher best way confirm cause solve problem put clear matching color vinyl tape across aileron gap bottom wing wont seen can expect substantial increase roll rate same aileron throw ready Wing warp could also culprit isnt difficult trim out effects wing warp using aileron rudder trim upright flying Unfortunately wing gets loaded up loops effect warp tendency airplane roll out loop Again airplane does tighter outside loops inside loops can expect rolling tendency worse during outside loop easy come up aileron rudder trim mismatch fliers start setting ailerons rudder streamwise direction adjust ailerons correct rolling tendency during upright flight Unfortunately airplane could sideslipping skidding would difficult determine loops performed airplane set up way acts like wings warped air plane will try roll course outside loops will probably worse inside loops same reason before way set up aileron/rudder trim initially eliminate rolling tendency during upright flight using aileron trim pullup vertical flight airplane heading directly upwind tendency airplane yaw appropriate rudder trim should added aileron trim should readjusted eliminate rolling tendency during upright flight whole procedure should repeated until no change trim required Airplanes swept trailing edges horizontal stabilizer required have split elevators unusual discover linkage operates elevators causes elevator move another have seen some fliers use different length elevator horns two elevators effect elevator moving another loop performed tendency airplane roll since elevator acts like small aileron Airplanes generally exhibit severe rolling tendency outside loops same reasons before Pilot error can also cause airplane roll out outside loops Pilots normally 112 Model Aviation 90~C 0 a. spa US SW % I, Ud,,UflVU irupimius awarded torSouthwostern B/C Championships clubsturning awaytrom traditional trophies very comfortable doing inside loops stick movement appears natural Outside ioops quite another story Most pilots have orientation problems difficult figure out just what airplane comes out groove addition pushing stick top box awkward pilots put some aileron deflection same time hope above discussion help Dick Cline some rest Please send favorite/worst problem Ill share everyone else Lets hope potential solutions dont run quite long has Ron Van Putte 12 Connie Drive Shah mar FL 32579 RC Pylon/Hager continued page 37 will need protection workers would suggest use 3/4 plywood barriers need barriers three pylons timers would also recommend use hard hats Someone club may work construction may able borrow hard hats weekend will need flags number pylon must different color color plane should have walkie talkie some means communication between starter number pylon will aid calling cuts etc race ten laps long have room race-horse start best planes take off once enough room must start planes second intervals fast can drop flag will have draw straws flip coin determine takeoff order race over planes have finished ten laps plane has cut pylon must make up lap Two cuts gets zero race Scoring done pointsfirst place 4 points second place 3 points third place 2 points fourth place point zero cutting out finishing Watch out frequency conflicts Fly rounds can person end day has points winner can spice up contest little concession stand will help club earn little money just done local level can have barbecue picnic AMA will send Pylon Racing Contest Procedure Guide asking guide will give run-down safety procedures complete easy understand instructions run race guide put together National Miniature Pylon Racing Associa tion Heres contest report winter contests did attend Tangerine Pylon Races missed good ten rounds very exciting racing no sure winner until very end Fast time 115 Dennis OBrien FirstBob Reuther 2nd J Little 3rdJ Moorehead 4thDennis OBrien 5thClyde Yarbrough 6thG Jacobson want know what going Send us contest reports small write-up about what went will try print can sent directly Bill Hager 5200 Rye Drive Dayton OH 45424 CORRECTION The plan Frank Ful lers Seversky SEV-32 September 1978 shows dihedral angle outer wing panels similar Army P-35 incorrect Fullers machine upper surface wing straight no dihedral throughout its span fuselage weight pod held onto bottom wing 4-40 nylon screw hard landing screw breaks wing bulkhead Something must have worked Warren ended up third Standard Class An impressive bird showed up past contest season Dennis Harveys Starfire Six second places isnt bad track record eighth place out 34 Stan dard Class contest survival paramount isnt bad either Harvey molds own epoxy glass fuse lages Wings styrofoam cores covered 1/64-in plywood Root airfoil NACA 6409 tip airfoil NACA 4411 FOR PIN full-span flaps solid balsa actuated root flaps have unusual feature Harvey labled Pas sively Restrained Flapsan idea en tered LSF Best Technical Achieve ment category last summer flaps will drop 40 degrees reflex 10 degrees However pin wing tip prevents tip reflexing see sketch Therefore flap reflexed flap pinned both ends preventing flutter Startire has 985 wingspan weighs 62 ounces gives relatively high wing loading 128 ounces per square foot does perform well eats up windy weather June1979 113 RC Soaring/Pruss continued page 38
Edition: Model Aviation - 1979/06
Page Numbers: 36, 111, 112, 113
THIS may seem like just another issue marks beginning fifth year columnist ModelAviation little four years ago publisher Carl Wheeley startled devil out calling ask would consider writing column Little did expect Id still doing now reasons has possible continue long bulky packages AMA Headquarters sends contaming club newsletters over country ideas excerpts inspi ration draw big help Another major assistance get letters sent readers comments reports suggestions photographs make job easier provide column lot would possible come up own also get letters asking assistance Most time can provide help myself know someone can recently got Ed Kirtley Bowling Green Kentucky referred Steve Helms K/C South Ed needs header pipe mates Webra Speed 61 OPS tuned pipe Since question probably general interest Steves response Webra no longer makes header pipe Speed 61 However HB makes both 2 3 elbow 2 elbow used upright engines pipe goes over top wing 3 elbow used side-mounted engines pipe goes below wing Ac cording Steve Macs also sells headers Speed 6 hOPS pipe combination hard get another letter just arrived Major Dick Cline Sierra Vista Arizona sug gests about Pattern Problem Monthsubmitted readers winning entry month receive some fabulous prize like broken 11 X 7 3/4 Zinger prop autographed pattern pilot choice problem let guy name exactly what Continued page 111 36 Model Aviation After Bob Christophers Hornet ate tail off Chuck Shades sistership Western Ohio Radio Kontrol SocietyA races pilot walked away carnage otherwent land Looking like cat ate canary Bobwe presume Shade Plc Good things come small packages Jim Prells Chickadee 1 /2A pattern ship features two-channel Ace tapered Ace foam wing Entire model Solaiflim coverediower temperature iron-on works OK over foam Right Both aileron eievator servos mounted wing elevator servo being accessible through top hatch Doubting Thomass please copy Half pattern absolutely practical Larry Kruse pix lective pushrod connections servo shown per Americans instruc tions made piggy-back servo arm standard arm two bushings discarded Robart servo two 2-56 screws nuts throttle pushrod top arm collective beneath may follow similar installation follow Americans instruc tions main rotor blade assembly notes regarding trimming blades length may misleading beginner trim blades length instruc tions call trimming root end ap proximately 1/16 measuring ex actly 21 root end blade achieve blades equal length Id recommend after cutting 1/16 off root ends closest end mounting holes blades fastened together blade top other using two 4-40x1 screws nuts through mounting holes cut 21 mark measured root top blade both blades cut together com mon reference being attachment points sure glass 4 roots blade per instructions didnt encounter problems rotor-head construction lead-lag ad justment coning-angle adjustment covered pages 8 9 10 tighten 5-40x1 bolt head must teeter limited dampener tubing during adjustment coning angle finally helicopter flown Install radio equipment liking reference instructions page 10 Radio Pushrod stallation through remainder factorys instructions notes check lists excellent American R/C really impressed detail re garding pushrod installation pre flight set-up Before first flight Com mander required two packages Pra ther Products Stick-On Weights 12 oz nose balance helicopter recommended Center Gravity Adding much weight disap pointing probably due choice light weight airborne battery pack location airborne sys tem used Ace R/C Digital Com mander receiver converted negative pulse four Pro-Line PLS-l 2 servos complete airborne system easily installed under seat Am erican R/C recommends battery pack installed forward seat couldnt resist hiding Hovering Commander should present particular problems Like helicopter similar aerobatic capabilities control response immedi ate first flights winds gust ing 20 knots machine behaved quite well tail rotor mixer date have flown Commander fast forward flight done aerobatics Im sure capable As mentioned earlier Command er may fitted autorotation device see photo modification kit consists basically replacement ny lon gear uni-directional bearing replacement bearing block has relieved accept addition one-way bearing gear ltest Commander fuselage side plates have drilled factory ac cept modification retro-fit standard Commander main ro tor blades must also replaced included model kit use autorotation device allows main rotor windmill event engine failure planned engine shut-down Since tail rotor drive via direct belt drive engine turning during autorotation main rotor pilot has control cy clic main rotor collective pitch tail rotor no longer necessary anti-torque function anyway autorotation device neat sys tem ability autorotate likely immedintely benefit rank beginner since beginners practice should altitude blade inertia alone will get helicop ter ground minimal damage advanced helicopter fliers wanting autorotation capability may de sire modification potential saving helicopter crashes due engine failure just provide new maneuver practice cer tainly degree skill necessary properly perform autorotation down soft landing device has proven itself re cent Tangerine several Ameri can R/C Helicopter Team demonstrated successful engine-out landings alti tudes 75 300 feet look forward trying autorotations soon will comment further time Gone flying Commander See next month Tbe AMA Nats arent far off folks scan Competition Newsletter section latest April issue Model viat ion has preliminaries late entry fee year $5000 Dave Chesney Rt 9 Box 621A Greensboro NC 27409 RC Aerobatics/Van Putte continued page 36 giving him troubleand other expert can con helping will answer question think Dick has great idea am willing give try Just case receptive Dick included two problems Ill give first shot month 10-6 9 7 Nashville Slow 8- 8 Gillopt 8 8 Regular 8-7 Regular 7 6 7 55 KELLY PROPS Winningest Fiberglas Graphite Propellers U S Nationals $650 Rat $650 $500 $475 $475 $375 Graphite $500 6% 5% Willoughby $375 Graphite $500 6 7/8 52 Anderson Ballard Latest Version Mk-3 $375 Graphite $500 7 4 FAI Combat Prop $375 Team Race Props DRAZEK NOVA JOHN GRAY Fiber $375 Graphite $500 ODDY ONE BLADE PROP W/out Counter Balence Fiber $400 Graphite $500 ORDER DIRECT 72 hour shipping cashiers checks money orders 10-day personal checks Money promptly refunded prop stock See Winston-Salem KELLY PRODUCTS NC P0 BOX 38 WESTERN SPRINGS IL 60558 June1979 111 DiCK MATHIS TRYING TO SET RIC FLYiNG BACK 43 YEARS HERES PAiR OF 1936 BEAUTiES FOR OLD TiMER FANS N-FOOT QUAKER $5500 NINE-FOOT VALLAIRE $6500 DICK MATHiS DESIGN GROUP BOX 338 LONE OAK TX 75453 PHONE 214/662-5326 Embryo Model RIE IRD#ISo $395Complete 79 Catalog sioolR EPLOTECH 16 WINGSPANGUIDE OF RUBBER MODEL SUPPLIESJINTERNATI0NAL INC PO BOX 2490-MA46500 MC KENZIE HWY pPLANS LA MESA CALIF 92041VIDA O9EQON 97469 try second next month So winning entry first monthly Pattern Problem Month have Airborne Associates Phoenix 6 OS6O F SR/pump CG front-to-back has checked both ground air appears okay plane balanced side-to-side wing engine stab 00 according Robart gauge Inside Loops superno falling off problem Outside Loops Almost Outside Loop has aborted plane tucks wing seems perform half roll problem could caused several things aileron gap wing warp aileron/rudder trim mismatch split elevator unequal movement pilot input forced say further information Id say probably due unequal aileron gap However look above potential causes might helpful Most airplanes perform tighter outside loops inside loops given amount elevator deflection pattern fliers adjust elevator travel achieve up elevator down elevator equal control stick deflection about neutral Consequently since natural move stick about same amount loops outside loops much smaller inside loops particularly true Phoenix 6 airplanes have flown reason always obtain some elevator dif ferential allowing servo arm neutral point rotated about 350 400 straight across servo elevator moves up moves down given stick deflection does aileron gap cause problems what does elevator differential have Well flier has airplane does tighter outside loops inside loops same stick movement wing will working harder develop lift perform outside loops Unless perfectly matched gap both ailerons wing will allow air leak through gap other will result unequal lift wings corresponding rolling tendency airplane out side loop maneuver aileron gap effect will have greatest effect since wing loading higher best way confirm cause solve problem put clear matching color vinyl tape across aileron gap bottom wing wont seen can expect substantial increase roll rate same aileron throw ready Wing warp could also culprit isnt difficult trim out effects wing warp using aileron rudder trim upright flying Unfortunately wing gets loaded up loops effect warp tendency airplane roll out loop Again airplane does tighter outside loops inside loops can expect rolling tendency worse during outside loop easy come up aileron rudder trim mismatch fliers start setting ailerons rudder streamwise direction adjust ailerons correct rolling tendency during upright flight Unfortunately airplane could sideslipping skidding would difficult determine loops performed airplane set up way acts like wings warped air plane will try roll course outside loops will probably worse inside loops same reason before way set up aileron/rudder trim initially eliminate rolling tendency during upright flight using aileron trim pullup vertical flight airplane heading directly upwind tendency airplane yaw appropriate rudder trim should added aileron trim should readjusted eliminate rolling tendency during upright flight whole procedure should repeated until no change trim required Airplanes swept trailing edges horizontal stabilizer required have split elevators unusual discover linkage operates elevators causes elevator move another have seen some fliers use different length elevator horns two elevators effect elevator moving another loop performed tendency airplane roll since elevator acts like small aileron Airplanes generally exhibit severe rolling tendency outside loops same reasons before Pilot error can also cause airplane roll out outside loops Pilots normally 112 Model Aviation 90~C 0 a. spa US SW % I, Ud,,UflVU irupimius awarded torSouthwostern B/C Championships clubsturning awaytrom traditional trophies very comfortable doing inside loops stick movement appears natural Outside ioops quite another story Most pilots have orientation problems difficult figure out just what airplane comes out groove addition pushing stick top box awkward pilots put some aileron deflection same time hope above discussion help Dick Cline some rest Please send favorite/worst problem Ill share everyone else Lets hope potential solutions dont run quite long has Ron Van Putte 12 Connie Drive Shah mar FL 32579 RC Pylon/Hager continued page 37 will need protection workers would suggest use 3/4 plywood barriers need barriers three pylons timers would also recommend use hard hats Someone club may work construction may able borrow hard hats weekend will need flags number pylon must different color color plane should have walkie talkie some means communication between starter number pylon will aid calling cuts etc race ten laps long have room race-horse start best planes take off once enough room must start planes second intervals fast can drop flag will have draw straws flip coin determine takeoff order race over planes have finished ten laps plane has cut pylon must make up lap Two cuts gets zero race Scoring done pointsfirst place 4 points second place 3 points third place 2 points fourth place point zero cutting out finishing Watch out frequency conflicts Fly rounds can person end day has points winner can spice up contest little concession stand will help club earn little money just done local level can have barbecue picnic AMA will send Pylon Racing Contest Procedure Guide asking guide will give run-down safety procedures complete easy understand instructions run race guide put together National Miniature Pylon Racing Associa tion Heres contest report winter contests did attend Tangerine Pylon Races missed good ten rounds very exciting racing no sure winner until very end Fast time 115 Dennis OBrien FirstBob Reuther 2nd J Little 3rdJ Moorehead 4thDennis OBrien 5thClyde Yarbrough 6thG Jacobson want know what going Send us contest reports small write-up about what went will try print can sent directly Bill Hager 5200 Rye Drive Dayton OH 45424 CORRECTION The plan Frank Ful lers Seversky SEV-32 September 1978 shows dihedral angle outer wing panels similar Army P-35 incorrect Fullers machine upper surface wing straight no dihedral throughout its span fuselage weight pod held onto bottom wing 4-40 nylon screw hard landing screw breaks wing bulkhead Something must have worked Warren ended up third Standard Class An impressive bird showed up past contest season Dennis Harveys Starfire Six second places isnt bad track record eighth place out 34 Stan dard Class contest survival paramount isnt bad either Harvey molds own epoxy glass fuse lages Wings styrofoam cores covered 1/64-in plywood Root airfoil NACA 6409 tip airfoil NACA 4411 FOR PIN full-span flaps solid balsa actuated root flaps have unusual feature Harvey labled Pas sively Restrained Flapsan idea en tered LSF Best Technical Achieve ment category last summer flaps will drop 40 degrees reflex 10 degrees However pin wing tip prevents tip reflexing see sketch Therefore flap reflexed flap pinned both ends preventing flutter Startire has 985 wingspan weighs 62 ounces gives relatively high wing loading 128 ounces per square foot does perform well eats up windy weather June1979 113 RC Soaring/Pruss continued page 38
Edition: Model Aviation - 1979/06
Page Numbers: 36, 111, 112, 113
THIS may seem like just another issue marks beginning fifth year columnist ModelAviation little four years ago publisher Carl Wheeley startled devil out calling ask would consider writing column Little did expect Id still doing now reasons has possible continue long bulky packages AMA Headquarters sends contaming club newsletters over country ideas excerpts inspi ration draw big help Another major assistance get letters sent readers comments reports suggestions photographs make job easier provide column lot would possible come up own also get letters asking assistance Most time can provide help myself know someone can recently got Ed Kirtley Bowling Green Kentucky referred Steve Helms K/C South Ed needs header pipe mates Webra Speed 61 OPS tuned pipe Since question probably general interest Steves response Webra no longer makes header pipe Speed 61 However HB makes both 2 3 elbow 2 elbow used upright engines pipe goes over top wing 3 elbow used side-mounted engines pipe goes below wing Ac cording Steve Macs also sells headers Speed 6 hOPS pipe combination hard get another letter just arrived Major Dick Cline Sierra Vista Arizona sug gests about Pattern Problem Monthsubmitted readers winning entry month receive some fabulous prize like broken 11 X 7 3/4 Zinger prop autographed pattern pilot choice problem let guy name exactly what Continued page 111 36 Model Aviation After Bob Christophers Hornet ate tail off Chuck Shades sistership Western Ohio Radio Kontrol SocietyA races pilot walked away carnage otherwent land Looking like cat ate canary Bobwe presume Shade Plc Good things come small packages Jim Prells Chickadee 1 /2A pattern ship features two-channel Ace tapered Ace foam wing Entire model Solaiflim coverediower temperature iron-on works OK over foam Right Both aileron eievator servos mounted wing elevator servo being accessible through top hatch Doubting Thomass please copy Half pattern absolutely practical Larry Kruse pix lective pushrod connections servo shown per Americans instruc tions made piggy-back servo arm standard arm two bushings discarded Robart servo two 2-56 screws nuts throttle pushrod top arm collective beneath may follow similar installation follow Americans instruc tions main rotor blade assembly notes regarding trimming blades length may misleading beginner trim blades length instruc tions call trimming root end ap proximately 1/16 measuring ex actly 21 root end blade achieve blades equal length Id recommend after cutting 1/16 off root ends closest end mounting holes blades fastened together blade top other using two 4-40x1 screws nuts through mounting holes cut 21 mark measured root top blade both blades cut together com mon reference being attachment points sure glass 4 roots blade per instructions didnt encounter problems rotor-head construction lead-lag ad justment coning-angle adjustment covered pages 8 9 10 tighten 5-40x1 bolt head must teeter limited dampener tubing during adjustment coning angle finally helicopter flown Install radio equipment liking reference instructions page 10 Radio Pushrod stallation through remainder factorys instructions notes check lists excellent American R/C really impressed detail re garding pushrod installation pre flight set-up Before first flight Com mander required two packages Pra ther Products Stick-On Weights 12 oz nose balance helicopter recommended Center Gravity Adding much weight disap pointing probably due choice light weight airborne battery pack location airborne sys tem used Ace R/C Digital Com mander receiver converted negative pulse four Pro-Line PLS-l 2 servos complete airborne system easily installed under seat Am erican R/C recommends battery pack installed forward seat couldnt resist hiding Hovering Commander should present particular problems Like helicopter similar aerobatic capabilities control response immedi ate first flights winds gust ing 20 knots machine behaved quite well tail rotor mixer date have flown Commander fast forward flight done aerobatics Im sure capable As mentioned earlier Command er may fitted autorotation device see photo modification kit consists basically replacement ny lon gear uni-directional bearing replacement bearing block has relieved accept addition one-way bearing gear ltest Commander fuselage side plates have drilled factory ac cept modification retro-fit standard Commander main ro tor blades must also replaced included model kit use autorotation device allows main rotor windmill event engine failure planned engine shut-down Since tail rotor drive via direct belt drive engine turning during autorotation main rotor pilot has control cy clic main rotor collective pitch tail rotor no longer necessary anti-torque function anyway autorotation device neat sys tem ability autorotate likely immedintely benefit rank beginner since beginners practice should altitude blade inertia alone will get helicop ter ground minimal damage advanced helicopter fliers wanting autorotation capability may de sire modification potential saving helicopter crashes due engine failure just provide new maneuver practice cer tainly degree skill necessary properly perform autorotation down soft landing device has proven itself re cent Tangerine several Ameri can R/C Helicopter Team demonstrated successful engine-out landings alti tudes 75 300 feet look forward trying autorotations soon will comment further time Gone flying Commander See next month Tbe AMA Nats arent far off folks scan Competition Newsletter section latest April issue Model viat ion has preliminaries late entry fee year $5000 Dave Chesney Rt 9 Box 621A Greensboro NC 27409 RC Aerobatics/Van Putte continued page 36 giving him troubleand other expert can con helping will answer question think Dick has great idea am willing give try Just case receptive Dick included two problems Ill give first shot month 10-6 9 7 Nashville Slow 8- 8 Gillopt 8 8 Regular 8-7 Regular 7 6 7 55 KELLY PROPS Winningest Fiberglas Graphite Propellers U S Nationals $650 Rat $650 $500 $475 $475 $375 Graphite $500 6% 5% Willoughby $375 Graphite $500 6 7/8 52 Anderson Ballard Latest Version Mk-3 $375 Graphite $500 7 4 FAI Combat Prop $375 Team Race Props DRAZEK NOVA JOHN GRAY Fiber $375 Graphite $500 ODDY ONE BLADE PROP W/out Counter Balence Fiber $400 Graphite $500 ORDER DIRECT 72 hour shipping cashiers checks money orders 10-day personal checks Money promptly refunded prop stock See Winston-Salem KELLY PRODUCTS NC P0 BOX 38 WESTERN SPRINGS IL 60558 June1979 111 DiCK MATHIS TRYING TO SET RIC FLYiNG BACK 43 YEARS HERES PAiR OF 1936 BEAUTiES FOR OLD TiMER FANS N-FOOT QUAKER $5500 NINE-FOOT VALLAIRE $6500 DICK MATHiS DESIGN GROUP BOX 338 LONE OAK TX 75453 PHONE 214/662-5326 Embryo Model RIE IRD#ISo $395Complete 79 Catalog sioolR EPLOTECH 16 WINGSPANGUIDE OF RUBBER MODEL SUPPLIESJINTERNATI0NAL INC PO BOX 2490-MA46500 MC KENZIE HWY pPLANS LA MESA CALIF 92041VIDA O9EQON 97469 try second next month So winning entry first monthly Pattern Problem Month have Airborne Associates Phoenix 6 OS6O F SR/pump CG front-to-back has checked both ground air appears okay plane balanced side-to-side wing engine stab 00 according Robart gauge Inside Loops superno falling off problem Outside Loops Almost Outside Loop has aborted plane tucks wing seems perform half roll problem could caused several things aileron gap wing warp aileron/rudder trim mismatch split elevator unequal movement pilot input forced say further information Id say probably due unequal aileron gap However look above potential causes might helpful Most airplanes perform tighter outside loops inside loops given amount elevator deflection pattern fliers adjust elevator travel achieve up elevator down elevator equal control stick deflection about neutral Consequently since natural move stick about same amount loops outside loops much smaller inside loops particularly true Phoenix 6 airplanes have flown reason always obtain some elevator dif ferential allowing servo arm neutral point rotated about 350 400 straight across servo elevator moves up moves down given stick deflection does aileron gap cause problems what does elevator differential have Well flier has airplane does tighter outside loops inside loops same stick movement wing will working harder develop lift perform outside loops Unless perfectly matched gap both ailerons wing will allow air leak through gap other will result unequal lift wings corresponding rolling tendency airplane out side loop maneuver aileron gap effect will have greatest effect since wing loading higher best way confirm cause solve problem put clear matching color vinyl tape across aileron gap bottom wing wont seen can expect substantial increase roll rate same aileron throw ready Wing warp could also culprit isnt difficult trim out effects wing warp using aileron rudder trim upright flying Unfortunately wing gets loaded up loops effect warp tendency airplane roll out loop Again airplane does tighter outside loops inside loops can expect rolling tendency worse during outside loop easy come up aileron rudder trim mismatch fliers start setting ailerons rudder streamwise direction adjust ailerons correct rolling tendency during upright flight Unfortunately airplane could sideslipping skidding would difficult determine loops performed airplane set up way acts like wings warped air plane will try roll course outside loops will probably worse inside loops same reason before way set up aileron/rudder trim initially eliminate rolling tendency during upright flight using aileron trim pullup vertical flight airplane heading directly upwind tendency airplane yaw appropriate rudder trim should added aileron trim should readjusted eliminate rolling tendency during upright flight whole procedure should repeated until no change trim required Airplanes swept trailing edges horizontal stabilizer required have split elevators unusual discover linkage operates elevators causes elevator move another have seen some fliers use different length elevator horns two elevators effect elevator moving another loop performed tendency airplane roll since elevator acts like small aileron Airplanes generally exhibit severe rolling tendency outside loops same reasons before Pilot error can also cause airplane roll out outside loops Pilots normally 112 Model Aviation 90~C 0 a. spa US SW % I, Ud,,UflVU irupimius awarded torSouthwostern B/C Championships clubsturning awaytrom traditional trophies very comfortable doing inside loops stick movement appears natural Outside ioops quite another story Most pilots have orientation problems difficult figure out just what airplane comes out groove addition pushing stick top box awkward pilots put some aileron deflection same time hope above discussion help Dick Cline some rest Please send favorite/worst problem Ill share everyone else Lets hope potential solutions dont run quite long has Ron Van Putte 12 Connie Drive Shah mar FL 32579 RC Pylon/Hager continued page 37 will need protection workers would suggest use 3/4 plywood barriers need barriers three pylons timers would also recommend use hard hats Someone club may work construction may able borrow hard hats weekend will need flags number pylon must different color color plane should have walkie talkie some means communication between starter number pylon will aid calling cuts etc race ten laps long have room race-horse start best planes take off once enough room must start planes second intervals fast can drop flag will have draw straws flip coin determine takeoff order race over planes have finished ten laps plane has cut pylon must make up lap Two cuts gets zero race Scoring done pointsfirst place 4 points second place 3 points third place 2 points fourth place point zero cutting out finishing Watch out frequency conflicts Fly rounds can person end day has points winner can spice up contest little concession stand will help club earn little money just done local level can have barbecue picnic AMA will send Pylon Racing Contest Procedure Guide asking guide will give run-down safety procedures complete easy understand instructions run race guide put together National Miniature Pylon Racing Associa tion Heres contest report winter contests did attend Tangerine Pylon Races missed good ten rounds very exciting racing no sure winner until very end Fast time 115 Dennis OBrien FirstBob Reuther 2nd J Little 3rdJ Moorehead 4thDennis OBrien 5thClyde Yarbrough 6thG Jacobson want know what going Send us contest reports small write-up about what went will try print can sent directly Bill Hager 5200 Rye Drive Dayton OH 45424 CORRECTION The plan Frank Ful lers Seversky SEV-32 September 1978 shows dihedral angle outer wing panels similar Army P-35 incorrect Fullers machine upper surface wing straight no dihedral throughout its span fuselage weight pod held onto bottom wing 4-40 nylon screw hard landing screw breaks wing bulkhead Something must have worked Warren ended up third Standard Class An impressive bird showed up past contest season Dennis Harveys Starfire Six second places isnt bad track record eighth place out 34 Stan dard Class contest survival paramount isnt bad either Harvey molds own epoxy glass fuse lages Wings styrofoam cores covered 1/64-in plywood Root airfoil NACA 6409 tip airfoil NACA 4411 FOR PIN full-span flaps solid balsa actuated root flaps have unusual feature Harvey labled Pas sively Restrained Flapsan idea en tered LSF Best Technical Achieve ment category last summer flaps will drop 40 degrees reflex 10 degrees However pin wing tip prevents tip reflexing see sketch Therefore flap reflexed flap pinned both ends preventing flutter Startire has 985 wingspan weighs 62 ounces gives relatively high wing loading 128 ounces per square foot does perform well eats up windy weather June1979 113 RC Soaring/Pruss continued page 38
Edition: Model Aviation - 1979/06
Page Numbers: 36, 111, 112, 113
THIS may seem like just another issue marks beginning fifth year columnist ModelAviation little four years ago publisher Carl Wheeley startled devil out calling ask would consider writing column Little did expect Id still doing now reasons has possible continue long bulky packages AMA Headquarters sends contaming club newsletters over country ideas excerpts inspi ration draw big help Another major assistance get letters sent readers comments reports suggestions photographs make job easier provide column lot would possible come up own also get letters asking assistance Most time can provide help myself know someone can recently got Ed Kirtley Bowling Green Kentucky referred Steve Helms K/C South Ed needs header pipe mates Webra Speed 61 OPS tuned pipe Since question probably general interest Steves response Webra no longer makes header pipe Speed 61 However HB makes both 2 3 elbow 2 elbow used upright engines pipe goes over top wing 3 elbow used side-mounted engines pipe goes below wing Ac cording Steve Macs also sells headers Speed 6 hOPS pipe combination hard get another letter just arrived Major Dick Cline Sierra Vista Arizona sug gests about Pattern Problem Monthsubmitted readers winning entry month receive some fabulous prize like broken 11 X 7 3/4 Zinger prop autographed pattern pilot choice problem let guy name exactly what Continued page 111 36 Model Aviation After Bob Christophers Hornet ate tail off Chuck Shades sistership Western Ohio Radio Kontrol SocietyA races pilot walked away carnage otherwent land Looking like cat ate canary Bobwe presume Shade Plc Good things come small packages Jim Prells Chickadee 1 /2A pattern ship features two-channel Ace tapered Ace foam wing Entire model Solaiflim coverediower temperature iron-on works OK over foam Right Both aileron eievator servos mounted wing elevator servo being accessible through top hatch Doubting Thomass please copy Half pattern absolutely practical Larry Kruse pix lective pushrod connections servo shown per Americans instruc tions made piggy-back servo arm standard arm two bushings discarded Robart servo two 2-56 screws nuts throttle pushrod top arm collective beneath may follow similar installation follow Americans instruc tions main rotor blade assembly notes regarding trimming blades length may misleading beginner trim blades length instruc tions call trimming root end ap proximately 1/16 measuring ex actly 21 root end blade achieve blades equal length Id recommend after cutting 1/16 off root ends closest end mounting holes blades fastened together blade top other using two 4-40x1 screws nuts through mounting holes cut 21 mark measured root top blade both blades cut together com mon reference being attachment points sure glass 4 roots blade per instructions didnt encounter problems rotor-head construction lead-lag ad justment coning-angle adjustment covered pages 8 9 10 tighten 5-40x1 bolt head must teeter limited dampener tubing during adjustment coning angle finally helicopter flown Install radio equipment liking reference instructions page 10 Radio Pushrod stallation through remainder factorys instructions notes check lists excellent American R/C really impressed detail re garding pushrod installation pre flight set-up Before first flight Com mander required two packages Pra ther Products Stick-On Weights 12 oz nose balance helicopter recommended Center Gravity Adding much weight disap pointing probably due choice light weight airborne battery pack location airborne sys tem used Ace R/C Digital Com mander receiver converted negative pulse four Pro-Line PLS-l 2 servos complete airborne system easily installed under seat Am erican R/C recommends battery pack installed forward seat couldnt resist hiding Hovering Commander should present particular problems Like helicopter similar aerobatic capabilities control response immedi ate first flights winds gust ing 20 knots machine behaved quite well tail rotor mixer date have flown Commander fast forward flight done aerobatics Im sure capable As mentioned earlier Command er may fitted autorotation device see photo modification kit consists basically replacement ny lon gear uni-directional bearing replacement bearing block has relieved accept addition one-way bearing gear ltest Commander fuselage side plates have drilled factory ac cept modification retro-fit standard Commander main ro tor blades must also replaced included model kit use autorotation device allows main rotor windmill event engine failure planned engine shut-down Since tail rotor drive via direct belt drive engine turning during autorotation main rotor pilot has control cy clic main rotor collective pitch tail rotor no longer necessary anti-torque function anyway autorotation device neat sys tem ability autorotate likely immedintely benefit rank beginner since beginners practice should altitude blade inertia alone will get helicop ter ground minimal damage advanced helicopter fliers wanting autorotation capability may de sire modification potential saving helicopter crashes due engine failure just provide new maneuver practice cer tainly degree skill necessary properly perform autorotation down soft landing device has proven itself re cent Tangerine several Ameri can R/C Helicopter Team demonstrated successful engine-out landings alti tudes 75 300 feet look forward trying autorotations soon will comment further time Gone flying Commander See next month Tbe AMA Nats arent far off folks scan Competition Newsletter section latest April issue Model viat ion has preliminaries late entry fee year $5000 Dave Chesney Rt 9 Box 621A Greensboro NC 27409 RC Aerobatics/Van Putte continued page 36 giving him troubleand other expert can con helping will answer question think Dick has great idea am willing give try Just case receptive Dick included two problems Ill give first shot month 10-6 9 7 Nashville Slow 8- 8 Gillopt 8 8 Regular 8-7 Regular 7 6 7 55 KELLY PROPS Winningest Fiberglas Graphite Propellers U S Nationals $650 Rat $650 $500 $475 $475 $375 Graphite $500 6% 5% Willoughby $375 Graphite $500 6 7/8 52 Anderson Ballard Latest Version Mk-3 $375 Graphite $500 7 4 FAI Combat Prop $375 Team Race Props DRAZEK NOVA JOHN GRAY Fiber $375 Graphite $500 ODDY ONE BLADE PROP W/out Counter Balence Fiber $400 Graphite $500 ORDER DIRECT 72 hour shipping cashiers checks money orders 10-day personal checks Money promptly refunded prop stock See Winston-Salem KELLY PRODUCTS NC P0 BOX 38 WESTERN SPRINGS IL 60558 June1979 111 DiCK MATHIS TRYING TO SET RIC FLYiNG BACK 43 YEARS HERES PAiR OF 1936 BEAUTiES FOR OLD TiMER FANS N-FOOT QUAKER $5500 NINE-FOOT VALLAIRE $6500 DICK MATHiS DESIGN GROUP BOX 338 LONE OAK TX 75453 PHONE 214/662-5326 Embryo Model RIE IRD#ISo $395Complete 79 Catalog sioolR EPLOTECH 16 WINGSPANGUIDE OF RUBBER MODEL SUPPLIESJINTERNATI0NAL INC PO BOX 2490-MA46500 MC KENZIE HWY pPLANS LA MESA CALIF 92041VIDA O9EQON 97469 try second next month So winning entry first monthly Pattern Problem Month have Airborne Associates Phoenix 6 OS6O F SR/pump CG front-to-back has checked both ground air appears okay plane balanced side-to-side wing engine stab 00 according Robart gauge Inside Loops superno falling off problem Outside Loops Almost Outside Loop has aborted plane tucks wing seems perform half roll problem could caused several things aileron gap wing warp aileron/rudder trim mismatch split elevator unequal movement pilot input forced say further information Id say probably due unequal aileron gap However look above potential causes might helpful Most airplanes perform tighter outside loops inside loops given amount elevator deflection pattern fliers adjust elevator travel achieve up elevator down elevator equal control stick deflection about neutral Consequently since natural move stick about same amount loops outside loops much smaller inside loops particularly true Phoenix 6 airplanes have flown reason always obtain some elevator dif ferential allowing servo arm neutral point rotated about 350 400 straight across servo elevator moves up moves down given stick deflection does aileron gap cause problems what does elevator differential have Well flier has airplane does tighter outside loops inside loops same stick movement wing will working harder develop lift perform outside loops Unless perfectly matched gap both ailerons wing will allow air leak through gap other will result unequal lift wings corresponding rolling tendency airplane out side loop maneuver aileron gap effect will have greatest effect since wing loading higher best way confirm cause solve problem put clear matching color vinyl tape across aileron gap bottom wing wont seen can expect substantial increase roll rate same aileron throw ready Wing warp could also culprit isnt difficult trim out effects wing warp using aileron rudder trim upright flying Unfortunately wing gets loaded up loops effect warp tendency airplane roll out loop Again airplane does tighter outside loops inside loops can expect rolling tendency worse during outside loop easy come up aileron rudder trim mismatch fliers start setting ailerons rudder streamwise direction adjust ailerons correct rolling tendency during upright flight Unfortunately airplane could sideslipping skidding would difficult determine loops performed airplane set up way acts like wings warped air plane will try roll course outside loops will probably worse inside loops same reason before way set up aileron/rudder trim initially eliminate rolling tendency during upright flight using aileron trim pullup vertical flight airplane heading directly upwind tendency airplane yaw appropriate rudder trim should added aileron trim should readjusted eliminate rolling tendency during upright flight whole procedure should repeated until no change trim required Airplanes swept trailing edges horizontal stabilizer required have split elevators unusual discover linkage operates elevators causes elevator move another have seen some fliers use different length elevator horns two elevators effect elevator moving another loop performed tendency airplane roll since elevator acts like small aileron Airplanes generally exhibit severe rolling tendency outside loops same reasons before Pilot error can also cause airplane roll out outside loops Pilots normally 112 Model Aviation 90~C 0 a. spa US SW % I, Ud,,UflVU irupimius awarded torSouthwostern B/C Championships clubsturning awaytrom traditional trophies very comfortable doing inside loops stick movement appears natural Outside ioops quite another story Most pilots have orientation problems difficult figure out just what airplane comes out groove addition pushing stick top box awkward pilots put some aileron deflection same time hope above discussion help Dick Cline some rest Please send favorite/worst problem Ill share everyone else Lets hope potential solutions dont run quite long has Ron Van Putte 12 Connie Drive Shah mar FL 32579 RC Pylon/Hager continued page 37 will need protection workers would suggest use 3/4 plywood barriers need barriers three pylons timers would also recommend use hard hats Someone club may work construction may able borrow hard hats weekend will need flags number pylon must different color color plane should have walkie talkie some means communication between starter number pylon will aid calling cuts etc race ten laps long have room race-horse start best planes take off once enough room must start planes second intervals fast can drop flag will have draw straws flip coin determine takeoff order race over planes have finished ten laps plane has cut pylon must make up lap Two cuts gets zero race Scoring done pointsfirst place 4 points second place 3 points third place 2 points fourth place point zero cutting out finishing Watch out frequency conflicts Fly rounds can person end day has points winner can spice up contest little concession stand will help club earn little money just done local level can have barbecue picnic AMA will send Pylon Racing Contest Procedure Guide asking guide will give run-down safety procedures complete easy understand instructions run race guide put together National Miniature Pylon Racing Associa tion Heres contest report winter contests did attend Tangerine Pylon Races missed good ten rounds very exciting racing no sure winner until very end Fast time 115 Dennis OBrien FirstBob Reuther 2nd J Little 3rdJ Moorehead 4thDennis OBrien 5thClyde Yarbrough 6thG Jacobson want know what going Send us contest reports small write-up about what went will try print can sent directly Bill Hager 5200 Rye Drive Dayton OH 45424 CORRECTION The plan Frank Ful lers Seversky SEV-32 September 1978 shows dihedral angle outer wing panels similar Army P-35 incorrect Fullers machine upper surface wing straight no dihedral throughout its span fuselage weight pod held onto bottom wing 4-40 nylon screw hard landing screw breaks wing bulkhead Something must have worked Warren ended up third Standard Class An impressive bird showed up past contest season Dennis Harveys Starfire Six second places isnt bad track record eighth place out 34 Stan dard Class contest survival paramount isnt bad either Harvey molds own epoxy glass fuse lages Wings styrofoam cores covered 1/64-in plywood Root airfoil NACA 6409 tip airfoil NACA 4411 FOR PIN full-span flaps solid balsa actuated root flaps have unusual feature Harvey labled Pas sively Restrained Flapsan idea en tered LSF Best Technical Achieve ment category last summer flaps will drop 40 degrees reflex 10 degrees However pin wing tip prevents tip reflexing see sketch Therefore flap reflexed flap pinned both ends preventing flutter Startire has 985 wingspan weighs 62 ounces gives relatively high wing loading 128 ounces per square foot does perform well eats up windy weather June1979 113 RC Soaring/Pruss continued page 38