A COUPLE months back reported contest Arizona Buckeye Southwest Regionals big event contests Southwest lately has Big Goodyear event described col umn recall made point event extremely popular right now will probably follow same pattern other racing events weve very active very competitive beginning followed gradual decline popularity performance levels go up pros start take over evidenced Big Goodyear Phoenix winning currently still record time turned Joe Klause Tune 0 SMax 35 Recently appeared Pattys Pinkie Control Line Flyer letter Mr Ron Duly noted competitor Southern California Ron has some interesting thoughts would like pass Opinion Ron Duly about Big Goodyear Aw phooey cant resist writing longer recent letters about Big Goodyear engines have gotten As last place finisher among 27 Buckeye Im certainly expert other hand aint no fool remarks SWCLA directed Ben set scene November December Continued Dare 119 October1979 51 Caught act trying fly Junior Mouse Bob Bott becomes incredible shrinking pilot try qualify Could Julie Sax Aaron Aicher just lapping him like mad I sJavU CIUUIIrIrarrIcIU flOl SIlO dUIlMOlUllraullIu site San virOS first umu out blues kept ,unor Rat winnIng 1978 called event director Albuquer que specifically asked OS 36 Tune/Hill could used After week thought got decision said OK told Joe Klause rest history discussed super engines felt since K&B 58s allowed OS 36 wouldnt harm Oh weeping wailing thats heard now spoiled event Big Good year will die Just read Bill whats-his-face MAhe knows Editors NoteThats Bill Lee case whats-his-face confuses OK children what want us use planes already specified never-been-seen-around-here Mike allowed local boys makes reported make kits anyone can get Oh Yeah What keeping SWCLA specifying particular engine will acceptable want ST 35 engines What about K&B 35 sport side-exhaust engine called K&B ask could/would build BB 35 using sport 58 case said No go buy parts hobby shop combo OK SWCLA judges cant buy engine configuration yet its OK other hand T&A Hobby Lobby has two Tune/Hill OS 36s stock ready go problem someone got beat Yes 26 teams got beat Only can first Get idea raced see would best number winner didnt like getting beat next time Ill try harder win dont care what rules SWCLA adopts Limit enginesfine about supplying fuel further equalize chemistry home-brew fuel might fun use K&B 100 see run Big Goodyear fun event Adopting further limits will still make fun event Im sure 27 entries Delta Dart would fun Make up minds what Big Goodyear should publish rules well see Buckeye 80 OK Wonder what Texas fun watch paint dry Youve heard Texans boast about having fastest guns west Must mean spray guns gums Either buy OS go fast change rules Quityerbitchen raceRon Duly Burbank CA Rons letter brings up some interesting points can wade through name-calling crying best point racing event rules compete against no matter what just let known let stay reasonably stable lets go race Big Goodyear flown Texas although wish unique will defy description interested hopefully intelligent reporter point last column topic event conceived purpose providing reason ably simple easy enter easy get started event must either kept very local basis governed some very special restrictive rules remain simple easy enter etc believe point valid would like reply Rons concern about what Texas fun least far fun model airplanes concerned Mainly fly AMA thats rightAMA events fly damn well Rat Goodyear Slow Rat flown well better place else country Ron fly AMA events must make up event compete lost us poor Texans have some fun local events too fly event down called Super Slow Rat Basically its Slow Rat few added engine tank restrictions its fun junior fliers getting Try size AMA events biggest restriction weve added Slow Rat will probably keep event slow outlaw Schnuerle ported engine suggestion Big Goodyear boys after watching Joe Klauses win Phoenix suggestion has terribly upset Ron Too bad Ron hope have fun Big Goodyear arent 27 others out youll have Tune/ Hill 05 36 come play big boys Slow Rat probably engine should first place also fly anotherfun event Texas call Quickie Rat Again Rat some additional plane engine restrictions make event simple fly simple enter simple competitive fun So what Texas fun Well watch lot paint dry Have ever seen nice Aerogloss turns milky humidity down theres nothing neater having big old roach get stuck wet epoxy Neat! final note Duke City Dope Sheet Albuquerque New Mexico edited Rich Cunningham comes following paragraph According special issue Pattys Pinkie Ron Duly finally made top ten Big Goodyear 7206 top three times Big Goodyear held now OS 36s Seems like California guys October1979 119 CL Racing/Lee continued page 51 Bob Haden Jeanette PA has already won three 1ST PLACE Helicopter trophies Tn Valley Static Show Pittsburgh PA WRAMS RIO Jam boree White Plains NY Toledo Weak Signals 24th RIO Exposition Toledo Ohio super sharp highly modified Kaven Bell Jet Ranger Bob says As can see photo Formula-U really helped make highly detailed paint job turn out great base color Flight Aluminum Raven Black nose Metallic Red Fiery Orange Aviation Yellow trim Im happy tell Formula-U stands up tool Prior photo model flown 6 times plus friction wear transporting shows events over country happy proud Bob pleased Formula-Us perform ance hope will give try next model Heres few winning reasons might consider 18 popular Gloss Metallic Flat flight line colors matching brush spray Quick Drying One-Step System OneCoat Coverage Higher Gloss Finish Fuel-Proof Mar-Resistant Lightweight Super Tough AND matches Pactras Solarfilm Colors NEED FINISHING HELP! Send $100 complete step-by-step fully illustrated instruction book covering PACTRA FINISHING SYSTEMS pwirn 7060 HOLLYWOOD BLVD LOS ANGELES CA 90028 decided couldnt beat us cubic inches theyd beat us cubic dollars may sound like sour grapes seems awful waste put Tune 36 Ringmaster rest case Bill Lee 3522 Tamarisk Lane Missouri City TX 77459 Tutor/Harrah continued page 62 mounting wingtip make sure works free flash removed slide lock mounted sheet metal screw substituted nut bolt lock washer additional locking strength Usually wing control flap elevator half will weigh other Put heavy parts outboard may save use un wanted weight later use ofMonoKote hinges recommended topic has postulation hard data approach cursory first glance started kicking around safety factor aerodynamic characteristics test fixture developed conjured up box gadgets might use someday should throw out hate worst condition test As picture exhibits used long vertical fin rudder order induce flutter strains unequal force top bottom Using Galloping Ghost actuator Rand coupled con trollable power source micro-switch counter set pulse rate between 495 535 cycles per minute tests stopped after two hours accumulated intermittent run ning over-strain motor over 60000 cycles rudder hinges purposely attached loose out alignment About 2000 additional cycles run air pressure force great enough rudder stop full throw direction Observation conclusions after tests hinges showed no points failure performed yond expectations end-view pictures trailing edge control surfaces attached show hinge works rolling manner rather bending action An interesting aspect rounded squared surfaces snugly mounted other react same way actuated tend seal off gap direction theyre moved Short running com plex wind tunnel tests application different airfoils some theories can made model applications case Tutor using symmetrical airfoil full working control flaps coupled elevator type hinge aerodynamically efficient assume general rule few exceptions upper camber line convexity curve airfoil its chord greater length lower camber line lift created conversely lift less case Tutor up-flaps/down-elevator effective lift would maintained wing lessened stabilizer turn will increase control surfaces efficiency sealing off gap surface increasing other end result being tighter uniform loop square loop could accomplished shorter radius curves corners reverse down-flaps/up-elevator wing lift would de crease stabilizer would still offer stability plus increased control surface effectiveness aiding same way above outside loops approach applicable control surfaces strictly up/down left/right conditions vertical horizontal line axis interested applicabil ity MonoKote type hinges ailerons flaps other factors must considered Flaps would benefit landing under-the-wing type upper wing camber extended over gap would assist takeoff Because amount control surface strip ailerons type hinge could considered Small wing tip type ailerons could neutralized since lift increase and/or loss needed occurs opposite and/or wrong ends wing Straight level flying long slow bank turns rudder-assist would probably controllable Because majority wing lift occurs within first 10 25% wing span beginning atthe root spin wing tip stall could uncontrollable unless other corrective measures taken proper mounting hinges and/or others little complex just having something move back forth up down Models capable attaining speeds hundreds miles per hour same real-size airplane like real airplanes can crash because structural failure neglect has shown through tests hinges will work properly longer periods time life expectancy models problem builder Hinges must mounted securely suf ficient number proper alignment unblemished control surface must square and/or parallel mating surface no binding twisting checked maximum throw control surface itself must designed constructed rigidly enough wont flutter under anticipated forces type flying Kits like Tutor have designed engineers experienced matters want make change make sure 120 Model Aviation can winner too! WITH FORMULA-U POLYURETHANE FINISH FOR GAS POWERED MODELS
Edition: Model Aviation - 1979/10
Page Numbers: 51, 119, 120
A COUPLE months back reported contest Arizona Buckeye Southwest Regionals big event contests Southwest lately has Big Goodyear event described col umn recall made point event extremely popular right now will probably follow same pattern other racing events weve very active very competitive beginning followed gradual decline popularity performance levels go up pros start take over evidenced Big Goodyear Phoenix winning currently still record time turned Joe Klause Tune 0 SMax 35 Recently appeared Pattys Pinkie Control Line Flyer letter Mr Ron Duly noted competitor Southern California Ron has some interesting thoughts would like pass Opinion Ron Duly about Big Goodyear Aw phooey cant resist writing longer recent letters about Big Goodyear engines have gotten As last place finisher among 27 Buckeye Im certainly expert other hand aint no fool remarks SWCLA directed Ben set scene November December Continued Dare 119 October1979 51 Caught act trying fly Junior Mouse Bob Bott becomes incredible shrinking pilot try qualify Could Julie Sax Aaron Aicher just lapping him like mad I sJavU CIUUIIrIrarrIcIU flOl SIlO dUIlMOlUllraullIu site San virOS first umu out blues kept ,unor Rat winnIng 1978 called event director Albuquer que specifically asked OS 36 Tune/Hill could used After week thought got decision said OK told Joe Klause rest history discussed super engines felt since K&B 58s allowed OS 36 wouldnt harm Oh weeping wailing thats heard now spoiled event Big Good year will die Just read Bill whats-his-face MAhe knows Editors NoteThats Bill Lee case whats-his-face confuses OK children what want us use planes already specified never-been-seen-around-here Mike allowed local boys makes reported make kits anyone can get Oh Yeah What keeping SWCLA specifying particular engine will acceptable want ST 35 engines What about K&B 35 sport side-exhaust engine called K&B ask could/would build BB 35 using sport 58 case said No go buy parts hobby shop combo OK SWCLA judges cant buy engine configuration yet its OK other hand T&A Hobby Lobby has two Tune/Hill OS 36s stock ready go problem someone got beat Yes 26 teams got beat Only can first Get idea raced see would best number winner didnt like getting beat next time Ill try harder win dont care what rules SWCLA adopts Limit enginesfine about supplying fuel further equalize chemistry home-brew fuel might fun use K&B 100 see run Big Goodyear fun event Adopting further limits will still make fun event Im sure 27 entries Delta Dart would fun Make up minds what Big Goodyear should publish rules well see Buckeye 80 OK Wonder what Texas fun watch paint dry Youve heard Texans boast about having fastest guns west Must mean spray guns gums Either buy OS go fast change rules Quityerbitchen raceRon Duly Burbank CA Rons letter brings up some interesting points can wade through name-calling crying best point racing event rules compete against no matter what just let known let stay reasonably stable lets go race Big Goodyear flown Texas although wish unique will defy description interested hopefully intelligent reporter point last column topic event conceived purpose providing reason ably simple easy enter easy get started event must either kept very local basis governed some very special restrictive rules remain simple easy enter etc believe point valid would like reply Rons concern about what Texas fun least far fun model airplanes concerned Mainly fly AMA thats rightAMA events fly damn well Rat Goodyear Slow Rat flown well better place else country Ron fly AMA events must make up event compete lost us poor Texans have some fun local events too fly event down called Super Slow Rat Basically its Slow Rat few added engine tank restrictions its fun junior fliers getting Try size AMA events biggest restriction weve added Slow Rat will probably keep event slow outlaw Schnuerle ported engine suggestion Big Goodyear boys after watching Joe Klauses win Phoenix suggestion has terribly upset Ron Too bad Ron hope have fun Big Goodyear arent 27 others out youll have Tune/ Hill 05 36 come play big boys Slow Rat probably engine should first place also fly anotherfun event Texas call Quickie Rat Again Rat some additional plane engine restrictions make event simple fly simple enter simple competitive fun So what Texas fun Well watch lot paint dry Have ever seen nice Aerogloss turns milky humidity down theres nothing neater having big old roach get stuck wet epoxy Neat! final note Duke City Dope Sheet Albuquerque New Mexico edited Rich Cunningham comes following paragraph According special issue Pattys Pinkie Ron Duly finally made top ten Big Goodyear 7206 top three times Big Goodyear held now OS 36s Seems like California guys October1979 119 CL Racing/Lee continued page 51 Bob Haden Jeanette PA has already won three 1ST PLACE Helicopter trophies Tn Valley Static Show Pittsburgh PA WRAMS RIO Jam boree White Plains NY Toledo Weak Signals 24th RIO Exposition Toledo Ohio super sharp highly modified Kaven Bell Jet Ranger Bob says As can see photo Formula-U really helped make highly detailed paint job turn out great base color Flight Aluminum Raven Black nose Metallic Red Fiery Orange Aviation Yellow trim Im happy tell Formula-U stands up tool Prior photo model flown 6 times plus friction wear transporting shows events over country happy proud Bob pleased Formula-Us perform ance hope will give try next model Heres few winning reasons might consider 18 popular Gloss Metallic Flat flight line colors matching brush spray Quick Drying One-Step System OneCoat Coverage Higher Gloss Finish Fuel-Proof Mar-Resistant Lightweight Super Tough AND matches Pactras Solarfilm Colors NEED FINISHING HELP! Send $100 complete step-by-step fully illustrated instruction book covering PACTRA FINISHING SYSTEMS pwirn 7060 HOLLYWOOD BLVD LOS ANGELES CA 90028 decided couldnt beat us cubic inches theyd beat us cubic dollars may sound like sour grapes seems awful waste put Tune 36 Ringmaster rest case Bill Lee 3522 Tamarisk Lane Missouri City TX 77459 Tutor/Harrah continued page 62 mounting wingtip make sure works free flash removed slide lock mounted sheet metal screw substituted nut bolt lock washer additional locking strength Usually wing control flap elevator half will weigh other Put heavy parts outboard may save use un wanted weight later use ofMonoKote hinges recommended topic has postulation hard data approach cursory first glance started kicking around safety factor aerodynamic characteristics test fixture developed conjured up box gadgets might use someday should throw out hate worst condition test As picture exhibits used long vertical fin rudder order induce flutter strains unequal force top bottom Using Galloping Ghost actuator Rand coupled con trollable power source micro-switch counter set pulse rate between 495 535 cycles per minute tests stopped after two hours accumulated intermittent run ning over-strain motor over 60000 cycles rudder hinges purposely attached loose out alignment About 2000 additional cycles run air pressure force great enough rudder stop full throw direction Observation conclusions after tests hinges showed no points failure performed yond expectations end-view pictures trailing edge control surfaces attached show hinge works rolling manner rather bending action An interesting aspect rounded squared surfaces snugly mounted other react same way actuated tend seal off gap direction theyre moved Short running com plex wind tunnel tests application different airfoils some theories can made model applications case Tutor using symmetrical airfoil full working control flaps coupled elevator type hinge aerodynamically efficient assume general rule few exceptions upper camber line convexity curve airfoil its chord greater length lower camber line lift created conversely lift less case Tutor up-flaps/down-elevator effective lift would maintained wing lessened stabilizer turn will increase control surfaces efficiency sealing off gap surface increasing other end result being tighter uniform loop square loop could accomplished shorter radius curves corners reverse down-flaps/up-elevator wing lift would de crease stabilizer would still offer stability plus increased control surface effectiveness aiding same way above outside loops approach applicable control surfaces strictly up/down left/right conditions vertical horizontal line axis interested applicabil ity MonoKote type hinges ailerons flaps other factors must considered Flaps would benefit landing under-the-wing type upper wing camber extended over gap would assist takeoff Because amount control surface strip ailerons type hinge could considered Small wing tip type ailerons could neutralized since lift increase and/or loss needed occurs opposite and/or wrong ends wing Straight level flying long slow bank turns rudder-assist would probably controllable Because majority wing lift occurs within first 10 25% wing span beginning atthe root spin wing tip stall could uncontrollable unless other corrective measures taken proper mounting hinges and/or others little complex just having something move back forth up down Models capable attaining speeds hundreds miles per hour same real-size airplane like real airplanes can crash because structural failure neglect has shown through tests hinges will work properly longer periods time life expectancy models problem builder Hinges must mounted securely suf ficient number proper alignment unblemished control surface must square and/or parallel mating surface no binding twisting checked maximum throw control surface itself must designed constructed rigidly enough wont flutter under anticipated forces type flying Kits like Tutor have designed engineers experienced matters want make change make sure 120 Model Aviation can winner too! WITH FORMULA-U POLYURETHANE FINISH FOR GAS POWERED MODELS
Edition: Model Aviation - 1979/10
Page Numbers: 51, 119, 120
A COUPLE months back reported contest Arizona Buckeye Southwest Regionals big event contests Southwest lately has Big Goodyear event described col umn recall made point event extremely popular right now will probably follow same pattern other racing events weve very active very competitive beginning followed gradual decline popularity performance levels go up pros start take over evidenced Big Goodyear Phoenix winning currently still record time turned Joe Klause Tune 0 SMax 35 Recently appeared Pattys Pinkie Control Line Flyer letter Mr Ron Duly noted competitor Southern California Ron has some interesting thoughts would like pass Opinion Ron Duly about Big Goodyear Aw phooey cant resist writing longer recent letters about Big Goodyear engines have gotten As last place finisher among 27 Buckeye Im certainly expert other hand aint no fool remarks SWCLA directed Ben set scene November December Continued Dare 119 October1979 51 Caught act trying fly Junior Mouse Bob Bott becomes incredible shrinking pilot try qualify Could Julie Sax Aaron Aicher just lapping him like mad I sJavU CIUUIIrIrarrIcIU flOl SIlO dUIlMOlUllraullIu site San virOS first umu out blues kept ,unor Rat winnIng 1978 called event director Albuquer que specifically asked OS 36 Tune/Hill could used After week thought got decision said OK told Joe Klause rest history discussed super engines felt since K&B 58s allowed OS 36 wouldnt harm Oh weeping wailing thats heard now spoiled event Big Good year will die Just read Bill whats-his-face MAhe knows Editors NoteThats Bill Lee case whats-his-face confuses OK children what want us use planes already specified never-been-seen-around-here Mike allowed local boys makes reported make kits anyone can get Oh Yeah What keeping SWCLA specifying particular engine will acceptable want ST 35 engines What about K&B 35 sport side-exhaust engine called K&B ask could/would build BB 35 using sport 58 case said No go buy parts hobby shop combo OK SWCLA judges cant buy engine configuration yet its OK other hand T&A Hobby Lobby has two Tune/Hill OS 36s stock ready go problem someone got beat Yes 26 teams got beat Only can first Get idea raced see would best number winner didnt like getting beat next time Ill try harder win dont care what rules SWCLA adopts Limit enginesfine about supplying fuel further equalize chemistry home-brew fuel might fun use K&B 100 see run Big Goodyear fun event Adopting further limits will still make fun event Im sure 27 entries Delta Dart would fun Make up minds what Big Goodyear should publish rules well see Buckeye 80 OK Wonder what Texas fun watch paint dry Youve heard Texans boast about having fastest guns west Must mean spray guns gums Either buy OS go fast change rules Quityerbitchen raceRon Duly Burbank CA Rons letter brings up some interesting points can wade through name-calling crying best point racing event rules compete against no matter what just let known let stay reasonably stable lets go race Big Goodyear flown Texas although wish unique will defy description interested hopefully intelligent reporter point last column topic event conceived purpose providing reason ably simple easy enter easy get started event must either kept very local basis governed some very special restrictive rules remain simple easy enter etc believe point valid would like reply Rons concern about what Texas fun least far fun model airplanes concerned Mainly fly AMA thats rightAMA events fly damn well Rat Goodyear Slow Rat flown well better place else country Ron fly AMA events must make up event compete lost us poor Texans have some fun local events too fly event down called Super Slow Rat Basically its Slow Rat few added engine tank restrictions its fun junior fliers getting Try size AMA events biggest restriction weve added Slow Rat will probably keep event slow outlaw Schnuerle ported engine suggestion Big Goodyear boys after watching Joe Klauses win Phoenix suggestion has terribly upset Ron Too bad Ron hope have fun Big Goodyear arent 27 others out youll have Tune/ Hill 05 36 come play big boys Slow Rat probably engine should first place also fly anotherfun event Texas call Quickie Rat Again Rat some additional plane engine restrictions make event simple fly simple enter simple competitive fun So what Texas fun Well watch lot paint dry Have ever seen nice Aerogloss turns milky humidity down theres nothing neater having big old roach get stuck wet epoxy Neat! final note Duke City Dope Sheet Albuquerque New Mexico edited Rich Cunningham comes following paragraph According special issue Pattys Pinkie Ron Duly finally made top ten Big Goodyear 7206 top three times Big Goodyear held now OS 36s Seems like California guys October1979 119 CL Racing/Lee continued page 51 Bob Haden Jeanette PA has already won three 1ST PLACE Helicopter trophies Tn Valley Static Show Pittsburgh PA WRAMS RIO Jam boree White Plains NY Toledo Weak Signals 24th RIO Exposition Toledo Ohio super sharp highly modified Kaven Bell Jet Ranger Bob says As can see photo Formula-U really helped make highly detailed paint job turn out great base color Flight Aluminum Raven Black nose Metallic Red Fiery Orange Aviation Yellow trim Im happy tell Formula-U stands up tool Prior photo model flown 6 times plus friction wear transporting shows events over country happy proud Bob pleased Formula-Us perform ance hope will give try next model Heres few winning reasons might consider 18 popular Gloss Metallic Flat flight line colors matching brush spray Quick Drying One-Step System OneCoat Coverage Higher Gloss Finish Fuel-Proof Mar-Resistant Lightweight Super Tough AND matches Pactras Solarfilm Colors NEED FINISHING HELP! Send $100 complete step-by-step fully illustrated instruction book covering PACTRA FINISHING SYSTEMS pwirn 7060 HOLLYWOOD BLVD LOS ANGELES CA 90028 decided couldnt beat us cubic inches theyd beat us cubic dollars may sound like sour grapes seems awful waste put Tune 36 Ringmaster rest case Bill Lee 3522 Tamarisk Lane Missouri City TX 77459 Tutor/Harrah continued page 62 mounting wingtip make sure works free flash removed slide lock mounted sheet metal screw substituted nut bolt lock washer additional locking strength Usually wing control flap elevator half will weigh other Put heavy parts outboard may save use un wanted weight later use ofMonoKote hinges recommended topic has postulation hard data approach cursory first glance started kicking around safety factor aerodynamic characteristics test fixture developed conjured up box gadgets might use someday should throw out hate worst condition test As picture exhibits used long vertical fin rudder order induce flutter strains unequal force top bottom Using Galloping Ghost actuator Rand coupled con trollable power source micro-switch counter set pulse rate between 495 535 cycles per minute tests stopped after two hours accumulated intermittent run ning over-strain motor over 60000 cycles rudder hinges purposely attached loose out alignment About 2000 additional cycles run air pressure force great enough rudder stop full throw direction Observation conclusions after tests hinges showed no points failure performed yond expectations end-view pictures trailing edge control surfaces attached show hinge works rolling manner rather bending action An interesting aspect rounded squared surfaces snugly mounted other react same way actuated tend seal off gap direction theyre moved Short running com plex wind tunnel tests application different airfoils some theories can made model applications case Tutor using symmetrical airfoil full working control flaps coupled elevator type hinge aerodynamically efficient assume general rule few exceptions upper camber line convexity curve airfoil its chord greater length lower camber line lift created conversely lift less case Tutor up-flaps/down-elevator effective lift would maintained wing lessened stabilizer turn will increase control surfaces efficiency sealing off gap surface increasing other end result being tighter uniform loop square loop could accomplished shorter radius curves corners reverse down-flaps/up-elevator wing lift would de crease stabilizer would still offer stability plus increased control surface effectiveness aiding same way above outside loops approach applicable control surfaces strictly up/down left/right conditions vertical horizontal line axis interested applicabil ity MonoKote type hinges ailerons flaps other factors must considered Flaps would benefit landing under-the-wing type upper wing camber extended over gap would assist takeoff Because amount control surface strip ailerons type hinge could considered Small wing tip type ailerons could neutralized since lift increase and/or loss needed occurs opposite and/or wrong ends wing Straight level flying long slow bank turns rudder-assist would probably controllable Because majority wing lift occurs within first 10 25% wing span beginning atthe root spin wing tip stall could uncontrollable unless other corrective measures taken proper mounting hinges and/or others little complex just having something move back forth up down Models capable attaining speeds hundreds miles per hour same real-size airplane like real airplanes can crash because structural failure neglect has shown through tests hinges will work properly longer periods time life expectancy models problem builder Hinges must mounted securely suf ficient number proper alignment unblemished control surface must square and/or parallel mating surface no binding twisting checked maximum throw control surface itself must designed constructed rigidly enough wont flutter under anticipated forces type flying Kits like Tutor have designed engineers experienced matters want make change make sure 120 Model Aviation can winner too! WITH FORMULA-U POLYURETHANE FINISH FOR GAS POWERED MODELS