Free Flight Old-Timers Clarence Haught REAL Old-Timers fly twin-pushers emphasis what real people nowadays just couldnt help myself Actually Real Old-Timers did fly twinpushers long before other events emerged Regardless what events may currently enjoy missing lot nostalgic fun dont try twinpusher twin-pusher may have first model airplane configuration certainly played major role model airplane competitions fact type reached high level sophistication before lost out familiar trac tor designs now accustomed Early twins essence simplici ty Just balsa A-frame supporting ward elevator rearward wing twin exposed rubber motors along frame rail rubber support ed wire loops called cans drove right-hand-rotation pusher propeller side left-hand version other No rudder fin employed model depending twin thrust sources dihedral directional stability course design some built-in headachesone major ones being problem keeping exposed lubricated motors becoming mired down grime landing field say nothing considerable aerody namic drag caused exposed motors problems overcome later versions developed 1937 1938 use motor tubes attempt overcome high-performance tractortype models emerging contest circuit course twin-pusher age fold ing props still future free-wheeling props contributed substan tial drag Still good well-trimmed twinpusher will put very creditable perform ance flown good competitor Fine say start Well designs available choose John Pond has some plans sale Im sure Also live near library has old aviation model magazines such Model Aircraft Builder mid-Thirties can probably locate interesting design abovementioned magazine July 1936 has Carl Schmaedigs Sky Scraper August issue has Championship Twin Pusher Ralph Kummel David Hecht Zaics Yearbooks 1934 193 5-36 1937 have good variety available through AMA Supply Service 1937 Zaic Yearbook also has very good article twin pushers Ed Manulkin Full-size plans arent really necessary critical dimensions called out airfoil can enlarged judicious use enlarging photocopy machine Construction twin-pusher quite straightforward Prop carving may deterrent has said prop Continued page 158 Bruce Augustus Sun Valley ID few Old-Timer fleet clockwise bot tom Goldberg Zipper redlwhite silk O&R 23 front rotor 020 Strato Streak Playboy Junior Mills 13cc diesel subsequent ly changed Elfin 249cc Bruce operates Augusta Airlines Clarence Bull Eugene OR sends photos two prides-and-joys New Ruler L uses Cyclone 65 power 14-6 prop Cover d gold silk finished c nitrate dope Sunburst colored dope Ship weighs 5502 Whats Control Line model R doing Free Flight column Clarence converted Fireball FF1 Bantam 19-powered ship weighs 18I 02 Dihedral added May1985 63 Clarence Haught favorite twinpusher American Junior Motors wound its ready iaunch Power 6 strands 1/4in FAi rubber wound 750 turns prop Power run wiii last about minute Clarence gives TP techniques column shrink slightly film will relax tiny wrinkles near ribs Turn frame upside down cut wing loose rest film ready add dihedral bracing covering method stressfree Ive usedfor microfilm may easily workable plastic covering adhesive applied first discussed below photos shows flexible frame loaded microfilm flexible frame coated thinned rubber cement allowed dry un til visible solvent gone larger microfilm frame rested top cover ing frame film will immediately adhere rubber cement frames can separated What adhesive Ray Harlan suggests proper spray cement can provide lighter adhesive plastic films con denser paper brushed-on adhesives recommends 3M Super 75 Super 77 Grumbacher 548 sprays order generate fine transparent sprays can uniformly applied Ray cautions such products must used very good ventilationopen windows fresh air suggests spray applied low room lighting strong cross lighting spray pattern will visible can controlled easily Use single pass narrow wings two passes leading edge trailing edgefor wide wings adhesive will remain tacky several hours plastic doesnt go correctly can gently pull loose try again Covering technique Ray Harlan suggests wing placed flat board over traced outline Tack-glue place necessary plastic can applied using light balsa frame lower over wing two persons can hold corners sheet plastic choose try flexible frame described above sprayed wing frame should bowed center rib contacts first Obviously would require steady hand lot practice Once film place wing use small soldering iron fine chisel tip trim excess film easier neater sharp blade seals edge film prevent tears Good luck develop other methods please share us Other photos Scale fliers several areas flying profile scale models such shown typically single-cov ered fuselages motor sticks sup port prop motor model shown being flown Bedford Boys Ranch Bedford TX Solve two Scale model problems once scale models tail-heavy require nose weight Another prob lem rubber bunching prop hook jamming prop special prop hook shown another photo machined brass aluminum needed balance model hook design prevents rubber jamming Bud Tenny Box 545 Richardson TX 75080 FF Old-Timers/Haught Continued page 63 carving builds character well pile balsa chips Most plans give prop blank dimensions layout followed prop desired 1 1 pitch/diameter ratio will result simply means pitch will 1 times diameter 12-in prop would have 18-in pitch sure carve right-hand left-hand propeller Pusher props just regular propellers driven front Proper rotation determined viewed rear model looking ward vertical prop blades rotate away other Another tip props sure free-wheeling device simple reliable system used simple sheet balsa skeeter-type flying models sold variety stores good easy duplicate Use piece brass tube having notch vertical side 158 Model Aviation 1LAi 1iiri Beach Ave na Del hi CA 2 lj21-624 NEW MK 2 H & K SUPER STARTERS Look before leap original still best Has new larger clutch fully supported applications 90 day warranty new lower prices MODEL 1 Q-35 Q-50 ZENOAH ROPER MODEL 2Super Hustler MAG II MODEL 3Tartan Twin Super Twin Glow Manufactured Distributed P K Products PO Box 62260 Hayward CA 945400 415 581-4277 Add $150 postage handling A-i Fireball t Z495 $3295 $3995 Dealers inquiries invited euw have plaea available forthe faeoua A-I Fireball Pluns show six production variants plus POUR modified also includes FirebatlF oats instructioss mid u lear other nice surprises Order Fireball Plus PakTODAY dmi Mailing Tube First Class orUFt deliverycharges price complete $25tO Ad d Secure back prop hub Also try support prop shaft two points eliminate wobble Power usually specified 10 strands Y-in brown rubber Brown rubber long gone same motor mod ern stock good place start often substitute six strands three loops A-in rubber good results Rubber motors twin pushers rigged no slack Some slack needed free-wheeling system work stretch first winding will usually provide motor should fit no droop between cans Motors wound opposite direc tions course easily determined checking prop rotation Early-day mod elers often modified egg beaters wind both motors simultaneously evenly can wound separately single winder need helper sure wind both motors equally Before flight check flying surfaces alignment warps incidence Inci dence usually 10 negative wing 3 positive elevator stabilizer Hand-glide model motors props adjust glide shifting wing forward correct diving elevator aft correct stalling fast flat glide desired first flight should low power 200-300 turns launch hold model wound props hub just give gentle push away low positive angle attack releasing props model should climb spiral Either direction fine should trimmed its natural turn direction increase turn washin elevator side away desired turn direction well gradually crease power successive flights usual ly quit about 600 750 turns 6 strands A-in rubber Glides relatively fast due drag stalling glide evident experiment basic incidences given above model refuses turn probably has too much dihedral An old rule thumb inch dihedral per foot wing span one-and-a-third inches per foot elevator span per side Competitions twin pushers widespread However informal competi tions available wherever two such models meet Todays competitions duration events time speed distance events held type can trimmed straightaway flight thus speed distance measur able comparable Today annual Society Antique Models SAM Championships include event twin-pushers one-flight duration contest often flown mass launch Last down wins although can sometimes difficult determine unless individual timers assigned model practice using panel visual judges sometimes ineffective due various flight patterns flown Welcome world twins Clarence Haught 3226 Honeysuckle Dr Coeur dAlene ID 83814 Fl B Tech/Cowley Continued page 66 rounds maxing through really wet windy ones Like fellow Aussies exhibits truly individualistic style models approach FAI flying Pauls latest concept wing chines streamlining device reduce fuselage tur bulence over flying surfaceswhich look like piggybacking space shuttle model Paul explains Wool tufts glued model showed airflow over wing near fuselage very unstableand established wing over fuselage produces less lift applying chines airflow much improved model behaves better glide Pauls ideas presented tech nical symposium during WC says found wing chines should have no 10 negative relation wing incidence claims further bonus under FAI rules wing area calculated extending line WILLIAMS ACCESSORIES BROTHER S 4 PILOTS ANDARD TSMAN RACING TARY WHEELS AGE TH CONTOUR BALLOON EN 4 ENGINES PRATT & WHITNEY HT HONE PARTS T & WHITNEY HONE GNOME AI5VICKERS DAU RELLUM FOR FULLY ILLUSTRATED CATALOG 4LLILIS SAN MARCOS CALIFORNIA 92069 ting advertisers mention read about Model Aviation 643-7616 • SHARP May1985 159
Edition: Model Aviation - 1985/05
Page Numbers: 63, 158, 159
Free Flight Old-Timers Clarence Haught REAL Old-Timers fly twin-pushers emphasis what real people nowadays just couldnt help myself Actually Real Old-Timers did fly twinpushers long before other events emerged Regardless what events may currently enjoy missing lot nostalgic fun dont try twinpusher twin-pusher may have first model airplane configuration certainly played major role model airplane competitions fact type reached high level sophistication before lost out familiar trac tor designs now accustomed Early twins essence simplici ty Just balsa A-frame supporting ward elevator rearward wing twin exposed rubber motors along frame rail rubber support ed wire loops called cans drove right-hand-rotation pusher propeller side left-hand version other No rudder fin employed model depending twin thrust sources dihedral directional stability course design some built-in headachesone major ones being problem keeping exposed lubricated motors becoming mired down grime landing field say nothing considerable aerody namic drag caused exposed motors problems overcome later versions developed 1937 1938 use motor tubes attempt overcome high-performance tractortype models emerging contest circuit course twin-pusher age fold ing props still future free-wheeling props contributed substan tial drag Still good well-trimmed twinpusher will put very creditable perform ance flown good competitor Fine say start Well designs available choose John Pond has some plans sale Im sure Also live near library has old aviation model magazines such Model Aircraft Builder mid-Thirties can probably locate interesting design abovementioned magazine July 1936 has Carl Schmaedigs Sky Scraper August issue has Championship Twin Pusher Ralph Kummel David Hecht Zaics Yearbooks 1934 193 5-36 1937 have good variety available through AMA Supply Service 1937 Zaic Yearbook also has very good article twin pushers Ed Manulkin Full-size plans arent really necessary critical dimensions called out airfoil can enlarged judicious use enlarging photocopy machine Construction twin-pusher quite straightforward Prop carving may deterrent has said prop Continued page 158 Bruce Augustus Sun Valley ID few Old-Timer fleet clockwise bot tom Goldberg Zipper redlwhite silk O&R 23 front rotor 020 Strato Streak Playboy Junior Mills 13cc diesel subsequent ly changed Elfin 249cc Bruce operates Augusta Airlines Clarence Bull Eugene OR sends photos two prides-and-joys New Ruler L uses Cyclone 65 power 14-6 prop Cover d gold silk finished c nitrate dope Sunburst colored dope Ship weighs 5502 Whats Control Line model R doing Free Flight column Clarence converted Fireball FF1 Bantam 19-powered ship weighs 18I 02 Dihedral added May1985 63 Clarence Haught favorite twinpusher American Junior Motors wound its ready iaunch Power 6 strands 1/4in FAi rubber wound 750 turns prop Power run wiii last about minute Clarence gives TP techniques column shrink slightly film will relax tiny wrinkles near ribs Turn frame upside down cut wing loose rest film ready add dihedral bracing covering method stressfree Ive usedfor microfilm may easily workable plastic covering adhesive applied first discussed below photos shows flexible frame loaded microfilm flexible frame coated thinned rubber cement allowed dry un til visible solvent gone larger microfilm frame rested top cover ing frame film will immediately adhere rubber cement frames can separated What adhesive Ray Harlan suggests proper spray cement can provide lighter adhesive plastic films con denser paper brushed-on adhesives recommends 3M Super 75 Super 77 Grumbacher 548 sprays order generate fine transparent sprays can uniformly applied Ray cautions such products must used very good ventilationopen windows fresh air suggests spray applied low room lighting strong cross lighting spray pattern will visible can controlled easily Use single pass narrow wings two passes leading edge trailing edgefor wide wings adhesive will remain tacky several hours plastic doesnt go correctly can gently pull loose try again Covering technique Ray Harlan suggests wing placed flat board over traced outline Tack-glue place necessary plastic can applied using light balsa frame lower over wing two persons can hold corners sheet plastic choose try flexible frame described above sprayed wing frame should bowed center rib contacts first Obviously would require steady hand lot practice Once film place wing use small soldering iron fine chisel tip trim excess film easier neater sharp blade seals edge film prevent tears Good luck develop other methods please share us Other photos Scale fliers several areas flying profile scale models such shown typically single-cov ered fuselages motor sticks sup port prop motor model shown being flown Bedford Boys Ranch Bedford TX Solve two Scale model problems once scale models tail-heavy require nose weight Another prob lem rubber bunching prop hook jamming prop special prop hook shown another photo machined brass aluminum needed balance model hook design prevents rubber jamming Bud Tenny Box 545 Richardson TX 75080 FF Old-Timers/Haught Continued page 63 carving builds character well pile balsa chips Most plans give prop blank dimensions layout followed prop desired 1 1 pitch/diameter ratio will result simply means pitch will 1 times diameter 12-in prop would have 18-in pitch sure carve right-hand left-hand propeller Pusher props just regular propellers driven front Proper rotation determined viewed rear model looking ward vertical prop blades rotate away other Another tip props sure free-wheeling device simple reliable system used simple sheet balsa skeeter-type flying models sold variety stores good easy duplicate Use piece brass tube having notch vertical side 158 Model Aviation 1LAi 1iiri Beach Ave na Del hi CA 2 lj21-624 NEW MK 2 H & K SUPER STARTERS Look before leap original still best Has new larger clutch fully supported applications 90 day warranty new lower prices MODEL 1 Q-35 Q-50 ZENOAH ROPER MODEL 2Super Hustler MAG II MODEL 3Tartan Twin Super Twin Glow Manufactured Distributed P K Products PO Box 62260 Hayward CA 945400 415 581-4277 Add $150 postage handling A-i Fireball t Z495 $3295 $3995 Dealers inquiries invited euw have plaea available forthe faeoua A-I Fireball Pluns show six production variants plus POUR modified also includes FirebatlF oats instructioss mid u lear other nice surprises Order Fireball Plus PakTODAY dmi Mailing Tube First Class orUFt deliverycharges price complete $25tO Ad d Secure back prop hub Also try support prop shaft two points eliminate wobble Power usually specified 10 strands Y-in brown rubber Brown rubber long gone same motor mod ern stock good place start often substitute six strands three loops A-in rubber good results Rubber motors twin pushers rigged no slack Some slack needed free-wheeling system work stretch first winding will usually provide motor should fit no droop between cans Motors wound opposite direc tions course easily determined checking prop rotation Early-day mod elers often modified egg beaters wind both motors simultaneously evenly can wound separately single winder need helper sure wind both motors equally Before flight check flying surfaces alignment warps incidence Inci dence usually 10 negative wing 3 positive elevator stabilizer Hand-glide model motors props adjust glide shifting wing forward correct diving elevator aft correct stalling fast flat glide desired first flight should low power 200-300 turns launch hold model wound props hub just give gentle push away low positive angle attack releasing props model should climb spiral Either direction fine should trimmed its natural turn direction increase turn washin elevator side away desired turn direction well gradually crease power successive flights usual ly quit about 600 750 turns 6 strands A-in rubber Glides relatively fast due drag stalling glide evident experiment basic incidences given above model refuses turn probably has too much dihedral An old rule thumb inch dihedral per foot wing span one-and-a-third inches per foot elevator span per side Competitions twin pushers widespread However informal competi tions available wherever two such models meet Todays competitions duration events time speed distance events held type can trimmed straightaway flight thus speed distance measur able comparable Today annual Society Antique Models SAM Championships include event twin-pushers one-flight duration contest often flown mass launch Last down wins although can sometimes difficult determine unless individual timers assigned model practice using panel visual judges sometimes ineffective due various flight patterns flown Welcome world twins Clarence Haught 3226 Honeysuckle Dr Coeur dAlene ID 83814 Fl B Tech/Cowley Continued page 66 rounds maxing through really wet windy ones Like fellow Aussies exhibits truly individualistic style models approach FAI flying Pauls latest concept wing chines streamlining device reduce fuselage tur bulence over flying surfaceswhich look like piggybacking space shuttle model Paul explains Wool tufts glued model showed airflow over wing near fuselage very unstableand established wing over fuselage produces less lift applying chines airflow much improved model behaves better glide Pauls ideas presented tech nical symposium during WC says found wing chines should have no 10 negative relation wing incidence claims further bonus under FAI rules wing area calculated extending line WILLIAMS ACCESSORIES BROTHER S 4 PILOTS ANDARD TSMAN RACING TARY WHEELS AGE TH CONTOUR BALLOON EN 4 ENGINES PRATT & WHITNEY HT HONE PARTS T & WHITNEY HONE GNOME AI5VICKERS DAU RELLUM FOR FULLY ILLUSTRATED CATALOG 4LLILIS SAN MARCOS CALIFORNIA 92069 ting advertisers mention read about Model Aviation 643-7616 • SHARP May1985 159
Edition: Model Aviation - 1985/05
Page Numbers: 63, 158, 159
Free Flight Old-Timers Clarence Haught REAL Old-Timers fly twin-pushers emphasis what real people nowadays just couldnt help myself Actually Real Old-Timers did fly twinpushers long before other events emerged Regardless what events may currently enjoy missing lot nostalgic fun dont try twinpusher twin-pusher may have first model airplane configuration certainly played major role model airplane competitions fact type reached high level sophistication before lost out familiar trac tor designs now accustomed Early twins essence simplici ty Just balsa A-frame supporting ward elevator rearward wing twin exposed rubber motors along frame rail rubber support ed wire loops called cans drove right-hand-rotation pusher propeller side left-hand version other No rudder fin employed model depending twin thrust sources dihedral directional stability course design some built-in headachesone major ones being problem keeping exposed lubricated motors becoming mired down grime landing field say nothing considerable aerody namic drag caused exposed motors problems overcome later versions developed 1937 1938 use motor tubes attempt overcome high-performance tractortype models emerging contest circuit course twin-pusher age fold ing props still future free-wheeling props contributed substan tial drag Still good well-trimmed twinpusher will put very creditable perform ance flown good competitor Fine say start Well designs available choose John Pond has some plans sale Im sure Also live near library has old aviation model magazines such Model Aircraft Builder mid-Thirties can probably locate interesting design abovementioned magazine July 1936 has Carl Schmaedigs Sky Scraper August issue has Championship Twin Pusher Ralph Kummel David Hecht Zaics Yearbooks 1934 193 5-36 1937 have good variety available through AMA Supply Service 1937 Zaic Yearbook also has very good article twin pushers Ed Manulkin Full-size plans arent really necessary critical dimensions called out airfoil can enlarged judicious use enlarging photocopy machine Construction twin-pusher quite straightforward Prop carving may deterrent has said prop Continued page 158 Bruce Augustus Sun Valley ID few Old-Timer fleet clockwise bot tom Goldberg Zipper redlwhite silk O&R 23 front rotor 020 Strato Streak Playboy Junior Mills 13cc diesel subsequent ly changed Elfin 249cc Bruce operates Augusta Airlines Clarence Bull Eugene OR sends photos two prides-and-joys New Ruler L uses Cyclone 65 power 14-6 prop Cover d gold silk finished c nitrate dope Sunburst colored dope Ship weighs 5502 Whats Control Line model R doing Free Flight column Clarence converted Fireball FF1 Bantam 19-powered ship weighs 18I 02 Dihedral added May1985 63 Clarence Haught favorite twinpusher American Junior Motors wound its ready iaunch Power 6 strands 1/4in FAi rubber wound 750 turns prop Power run wiii last about minute Clarence gives TP techniques column shrink slightly film will relax tiny wrinkles near ribs Turn frame upside down cut wing loose rest film ready add dihedral bracing covering method stressfree Ive usedfor microfilm may easily workable plastic covering adhesive applied first discussed below photos shows flexible frame loaded microfilm flexible frame coated thinned rubber cement allowed dry un til visible solvent gone larger microfilm frame rested top cover ing frame film will immediately adhere rubber cement frames can separated What adhesive Ray Harlan suggests proper spray cement can provide lighter adhesive plastic films con denser paper brushed-on adhesives recommends 3M Super 75 Super 77 Grumbacher 548 sprays order generate fine transparent sprays can uniformly applied Ray cautions such products must used very good ventilationopen windows fresh air suggests spray applied low room lighting strong cross lighting spray pattern will visible can controlled easily Use single pass narrow wings two passes leading edge trailing edgefor wide wings adhesive will remain tacky several hours plastic doesnt go correctly can gently pull loose try again Covering technique Ray Harlan suggests wing placed flat board over traced outline Tack-glue place necessary plastic can applied using light balsa frame lower over wing two persons can hold corners sheet plastic choose try flexible frame described above sprayed wing frame should bowed center rib contacts first Obviously would require steady hand lot practice Once film place wing use small soldering iron fine chisel tip trim excess film easier neater sharp blade seals edge film prevent tears Good luck develop other methods please share us Other photos Scale fliers several areas flying profile scale models such shown typically single-cov ered fuselages motor sticks sup port prop motor model shown being flown Bedford Boys Ranch Bedford TX Solve two Scale model problems once scale models tail-heavy require nose weight Another prob lem rubber bunching prop hook jamming prop special prop hook shown another photo machined brass aluminum needed balance model hook design prevents rubber jamming Bud Tenny Box 545 Richardson TX 75080 FF Old-Timers/Haught Continued page 63 carving builds character well pile balsa chips Most plans give prop blank dimensions layout followed prop desired 1 1 pitch/diameter ratio will result simply means pitch will 1 times diameter 12-in prop would have 18-in pitch sure carve right-hand left-hand propeller Pusher props just regular propellers driven front Proper rotation determined viewed rear model looking ward vertical prop blades rotate away other Another tip props sure free-wheeling device simple reliable system used simple sheet balsa skeeter-type flying models sold variety stores good easy duplicate Use piece brass tube having notch vertical side 158 Model Aviation 1LAi 1iiri Beach Ave na Del hi CA 2 lj21-624 NEW MK 2 H & K SUPER STARTERS Look before leap original still best Has new larger clutch fully supported applications 90 day warranty new lower prices MODEL 1 Q-35 Q-50 ZENOAH ROPER MODEL 2Super Hustler MAG II MODEL 3Tartan Twin Super Twin Glow Manufactured Distributed P K Products PO Box 62260 Hayward CA 945400 415 581-4277 Add $150 postage handling A-i Fireball t Z495 $3295 $3995 Dealers inquiries invited euw have plaea available forthe faeoua A-I Fireball Pluns show six production variants plus POUR modified also includes FirebatlF oats instructioss mid u lear other nice surprises Order Fireball Plus PakTODAY dmi Mailing Tube First Class orUFt deliverycharges price complete $25tO Ad d Secure back prop hub Also try support prop shaft two points eliminate wobble Power usually specified 10 strands Y-in brown rubber Brown rubber long gone same motor mod ern stock good place start often substitute six strands three loops A-in rubber good results Rubber motors twin pushers rigged no slack Some slack needed free-wheeling system work stretch first winding will usually provide motor should fit no droop between cans Motors wound opposite direc tions course easily determined checking prop rotation Early-day mod elers often modified egg beaters wind both motors simultaneously evenly can wound separately single winder need helper sure wind both motors equally Before flight check flying surfaces alignment warps incidence Inci dence usually 10 negative wing 3 positive elevator stabilizer Hand-glide model motors props adjust glide shifting wing forward correct diving elevator aft correct stalling fast flat glide desired first flight should low power 200-300 turns launch hold model wound props hub just give gentle push away low positive angle attack releasing props model should climb spiral Either direction fine should trimmed its natural turn direction increase turn washin elevator side away desired turn direction well gradually crease power successive flights usual ly quit about 600 750 turns 6 strands A-in rubber Glides relatively fast due drag stalling glide evident experiment basic incidences given above model refuses turn probably has too much dihedral An old rule thumb inch dihedral per foot wing span one-and-a-third inches per foot elevator span per side Competitions twin pushers widespread However informal competi tions available wherever two such models meet Todays competitions duration events time speed distance events held type can trimmed straightaway flight thus speed distance measur able comparable Today annual Society Antique Models SAM Championships include event twin-pushers one-flight duration contest often flown mass launch Last down wins although can sometimes difficult determine unless individual timers assigned model practice using panel visual judges sometimes ineffective due various flight patterns flown Welcome world twins Clarence Haught 3226 Honeysuckle Dr Coeur dAlene ID 83814 Fl B Tech/Cowley Continued page 66 rounds maxing through really wet windy ones Like fellow Aussies exhibits truly individualistic style models approach FAI flying Pauls latest concept wing chines streamlining device reduce fuselage tur bulence over flying surfaceswhich look like piggybacking space shuttle model Paul explains Wool tufts glued model showed airflow over wing near fuselage very unstableand established wing over fuselage produces less lift applying chines airflow much improved model behaves better glide Pauls ideas presented tech nical symposium during WC says found wing chines should have no 10 negative relation wing incidence claims further bonus under FAI rules wing area calculated extending line WILLIAMS ACCESSORIES BROTHER S 4 PILOTS ANDARD TSMAN RACING TARY WHEELS AGE TH CONTOUR BALLOON EN 4 ENGINES PRATT & WHITNEY HT HONE PARTS T & WHITNEY HONE GNOME AI5VICKERS DAU RELLUM FOR FULLY ILLUSTRATED CATALOG 4LLILIS SAN MARCOS CALIFORNIA 92069 ting advertisers mention read about Model Aviation 643-7616 • SHARP May1985 159