Sport Aerobatics Ron Van Putte FOR THE PAST several issues monthly article taken up single subject change pace month Ill cover several different subjects Theres no particular reason except bunch ideas popped head reviewing packet club newsletters AMA sent Before moving various subjects Id like share gem included Cape Ann RC Model Club newsletter edited Lowell Warren Linguistic ItemDifference netween Glitch Glinch Glitch momentary signal radio interference affecting control plane Glinch priceless momentary expression pilots face during slightly after Glitch So thats what its called Having newsletter editor Western Ohio Radio Kontrol Society four years Eglin Aero Modellers Florida two years can appreciate hard work goes turning out club newsletter one-page newsletter has gathered master typed handwritten copies produced have addressed stamped mailed job usually falls club member enlists wife occasion ally kids help Club members enjoy receiving newsletter rarely offer assistance Thats surprised received Sport models have lots dihedraland usually no ailerons turn em rudder Ron tells us possible months column Pattern models usually have little no dihedral wont turn worth hoot just rudder input modified Sig Kadet used its builder Milt Hayes test bed various radios engines turned pipes Seen flO Afl OA ADO lrn pipe Photo Earl Bud Gay copy Flightitne newsletter GreaterLast night out practicing after work Cincinnati Radio Control Club bestPattern contest will held nextweekend newsletter Ive ever seen partly because isStrangely engine problems Actually chock full good items partly because itwas doubly strange because usually dont have has professional appearance mostly be-engine problems usually cause contributions 14 clubcontest So practice field members Congratulations Greater Cm-all time needed figure out what cinnati Radio Control Club Flightline Editorwrong turned out leaky carburetor J Wambach Jr superior jobI hope thebefore discovering pulled engine club members appreciate great newsletterand tank During process checked fuel havefilter reminded Id never mentioned method fixing leaky fuel filters fuel filters supplied fiber washer After short washers come hard brittle begin leak air 40 Model Aviation CeMENt filter go local hardware store ask see asortment neoprene 0rings found plumbing section perfect fit filter housing fuel use has never caused 0-rings deteriorate detectable manner fuel filter doesnt leak air would nice filter manufacturers would supply neoprene 0-rings instead crummy fiber washers brings up another item Weve got own pet wishes about RC products start out describingby saying would nice if. Weve often come up new idea built working example own use dont like go through hassle doing job over again time want another version good example device like would Ball Link dont know orginally came up idea useful Im glad Dewey Broberg Du-Bro markets because Id hate try make form scratch point manufacturers out just itching ideas products can marketed other side modelers would glad buy products available thats required way modelers get ideas mail send several likely manufacturers designer rarely gets publicity way example invented Ball Link Another way send itto think its good idea too Ill cover column full credit source way manufacturers can get idea inventor can get credit Let hear because know hundreds great ideas out just waiting publicized RC fliers pretty good aerodynamicists regardless backgrounds because theyve developed skills experience observa tions often become respected authorities clubs write articles club newsletters about airplanes fly Most time what see about aerodynamics club newsletters very good once real clinker incorrect although appears explain situation Recently saw explana tion dihedral works developing roll stability airplane Unfortunately ex planation wrong Ive heard read same wrong explanation times think its time clarify what really happens will also explain wings dihedral can used rudder roll turn airplane First let cover wrong explanation dihedral effect explanation hinges incorrect assumption lift always upward wings Figure 1 rolling effect lift canceled out opposite side wing However wing rolled Figure 2 lift wing panel acting surface effectively smaller other panel consequently rolling moment generated restores wing level condition reasoning appears explain dihedral can used generate roll stability wrong Lift wing does just act vertical direction fact airplane has no idea has rolled could hold airplane airstream roll about fuselage axis aligned local air velocity no rolling moment would generated So does dihedral work Dihedral effects requires two factors dihedral sideslip What happens airplane rolls Figure 3 component airplane weight direction low wing causes airplane slip direction sideslip causes change effective angle attack wing panels can easily visualize difference angle attack holding book open V moving sideslip different angles attack two panels causes rolling moment generated tends roll wings back level attitude wings level no longer component weight trying slip airplane stops sideslipping rolling moment goes away Thats dihedral stabilizes airplane roll Now what about rudder can used roll airplane dihedral wings rudder used yaw airplane causing sideslip As before sideslip generates rolling moment airplane rolls direction rudder moved way may have heard reason airplane rolls rudder because yawing airplane causes wing speed up other slow down speed difference causes different amounts lift generated rolls airplane does happen has much smaller effect dihedral has can easily demonstrated attempting roll Pattern airplanes rudder Pattern airplanes have little dihedral effect just skid along rudder deflected Last week bought myself late Christmas early birthday present am anxious build try out drooling over options available transmitters featuring new Signetics NE5044 encoder integrated circuit didnt really want give up Kraft KP August 1981 41 Continued page 120 Finish international orange butyrate dope flattener added over silkspan complete fuselage top cockpit removeable access engine drive train Weldon has made electric retract mechanisms operational sprung landing gear legs reservoir supplies air bladder wheel brakes cockpit well detailed including operating hand cranks lowering side windows Unquestionably fine example Precision Scale Giant Scale class 18 lb Vito Tomeos scratch-built 1/6-scale Hawker Sea Fury first place winner Military Stand-off class seen 18 lb 77-in span model flight last years Nats Dennis Bryll placed second P-47 Thunderbolt Third place Stand-off winner anotherfamiliar plane having won first place 77 80 Nats P-6 1 Black Widow Roger Brennom 195 lb plane scratch-built Wylam drawings foam balsa construction Hobbypoxy finish Three hand-made nonretractable gear legs have two springs Roger has recently installed new OS 60 engines seems well-tried flying planes making appearance Toledo Non military Stand-off Scale Starduster Too Terry Williams awarded first place Team Selection proposal has made select three Scale Teams Seguin Nats F4C Radio Control F4B Control-line Stand-off Radio Control though nation making bid 1982 World Champ ionship has USSR have elected omit Stand-off RC being proposed basis another nation may make attractive bid 1982 would include Stand off RC preparations must made send team eventuality Therefore modelers wish have entries considered three classes must have FAI stamp AMA licenses must pay FAI entry fee addition Nats entry fee must enter model complies FAI rules should noted FAI designation event Stand-off RC Scale US called RC Sport Scale no other nation makes successful bid 1982 World Championship FAI plenary session December USSR bid accepted refunds FAI program entry fee will made AMA headquarters upon appli cation Sport Scale RC Nats contestants serious effort being made least other nation outbid USSR Stand-off RC can included present far popular Scale event nations except USSR certainly deserves World Cham pionship status Bob andDolly Wischer Rt 1 S-22lLapham Peak Roa4 Delafiel4 WI 53018 RC Aerobatics/Van Putte Continued page 41 7Z transmitter because great sticks convenient trim pot locations So made compromise bought Ace Silver Seven encoder kit replace Kraft encoder As usual Fred Marks has done fine job Ace developing kit instructions assembly adjustment troubleshooting Ace suggests experienced kit build ers attempt retrofit encoder another transmitter However Ive experience assembling Ace Royal servo kits trouble shooting servo problems building Royal re ceiver installing dual rate switches KP-7Z transmitter Consequently lam optimis tic half-vast experience will carry through job course intend thing instructions say thoroughly read what George Myers wrote column Silver Seven transmitter August 1980 is6ue Model Aviation things work out well youll hear about what great job did dont work out Ill probably forget mention Ron Van Putte 111 Sleepy Oaks Rd Fort Walton Beach FL 32548 RC Giant Scale/Beckman Continued page 43 indicates commercial props 18-10 size will deliver 20 25 lb thrust 8000 rpm Its no wonder prop pulls Wendells Skybolt good authority whole subject propellers has become fascinating hadnt really put much thought started engine project quickly became apparent testing props much engines variables involved impossible really cover everything properly space well have available going through tremendous learning process ourselves just hope will able pass along Plan reviews month reviewing two plans available Taylorcraft Ltd have around about two years first saw prototypes Bill Wendts Fokker DVIII Ken Runestrands L-4B Morgan Hill 1979 first Giant Scale Fly-in literaly overwhelmed new impressions information two birds stood out Bills DVIII built scale sounds odd US modelers 1 ft 1 meter alittlelessthan one-third scale Bill worked European drawings metric dimensions easier converting exact one-third scale plans three sheets approxi mately 3 ft 6 ft clear easily read contain fair amount detail dont have much detail control surface hinging control hook-up however dont have experience area youll need some help obvious aircraft designed big bangers mind Materials construc tion techniques rugged Basic structures spruce plywood some balsa mostly weight critical wing employs beautiful set box spars built up -in square spruce 1/32-in ply wing separates center both wing locking strut attachment systems ingenious simple effective plans show Quadra original flew nicely cowl will accept almost currently available engines building Bills plans change would make use foam-core board some ribs formers rudder elevator cores already know Im hooked foam-core L-4B Grasshopper ubiquitous Piper Cub uniform Painted olive drab cabin windows extended behind wing used throughout WW II liaison observation aircraft Kens plans unusual can used modify existing kit Nosen Balsa USA manner builder selects cuts materials work kit sure make material changes indicated Kens plans Continued page 122 120 Model Aviation job heresonethatwill 37 Cu engine develops almost 4 hp yet weighs pound over Quadra has power pull Byron Pitta straight upwithout prop reduction also takes no space Quadrait will fit entirely inside cowl Nosen D unexposed stripped chain-saw motor engine manufactured USA miniature aircraft use Comes complete ready run year 100% warranty OMPLETE MODIFIED 37 ENGINE Lnul I. r.at ramoivgq Senu .ct MO COD UPS Add $400 shipping & Ia SCALE DOCUIVIENTATION SCALE DRAWHOTOS eOCKLETS IP REPLA-TECH 191 INTERNATIONAL CATALOGS $200 4SEOO MC KENZIE HWY VIDA OREGON 974B9
Edition: Model Aviation - 1981/08
Page Numbers: 40, 41, 120
Sport Aerobatics Ron Van Putte FOR THE PAST several issues monthly article taken up single subject change pace month Ill cover several different subjects Theres no particular reason except bunch ideas popped head reviewing packet club newsletters AMA sent Before moving various subjects Id like share gem included Cape Ann RC Model Club newsletter edited Lowell Warren Linguistic ItemDifference netween Glitch Glinch Glitch momentary signal radio interference affecting control plane Glinch priceless momentary expression pilots face during slightly after Glitch So thats what its called Having newsletter editor Western Ohio Radio Kontrol Society four years Eglin Aero Modellers Florida two years can appreciate hard work goes turning out club newsletter one-page newsletter has gathered master typed handwritten copies produced have addressed stamped mailed job usually falls club member enlists wife occasion ally kids help Club members enjoy receiving newsletter rarely offer assistance Thats surprised received Sport models have lots dihedraland usually no ailerons turn em rudder Ron tells us possible months column Pattern models usually have little no dihedral wont turn worth hoot just rudder input modified Sig Kadet used its builder Milt Hayes test bed various radios engines turned pipes Seen flO Afl OA ADO lrn pipe Photo Earl Bud Gay copy Flightitne newsletter GreaterLast night out practicing after work Cincinnati Radio Control Club bestPattern contest will held nextweekend newsletter Ive ever seen partly because isStrangely engine problems Actually chock full good items partly because itwas doubly strange because usually dont have has professional appearance mostly be-engine problems usually cause contributions 14 clubcontest So practice field members Congratulations Greater Cm-all time needed figure out what cinnati Radio Control Club Flightline Editorwrong turned out leaky carburetor J Wambach Jr superior jobI hope thebefore discovering pulled engine club members appreciate great newsletterand tank During process checked fuel havefilter reminded Id never mentioned method fixing leaky fuel filters fuel filters supplied fiber washer After short washers come hard brittle begin leak air 40 Model Aviation CeMENt filter go local hardware store ask see asortment neoprene 0rings found plumbing section perfect fit filter housing fuel use has never caused 0-rings deteriorate detectable manner fuel filter doesnt leak air would nice filter manufacturers would supply neoprene 0-rings instead crummy fiber washers brings up another item Weve got own pet wishes about RC products start out describingby saying would nice if. Weve often come up new idea built working example own use dont like go through hassle doing job over again time want another version good example device like would Ball Link dont know orginally came up idea useful Im glad Dewey Broberg Du-Bro markets because Id hate try make form scratch point manufacturers out just itching ideas products can marketed other side modelers would glad buy products available thats required way modelers get ideas mail send several likely manufacturers designer rarely gets publicity way example invented Ball Link Another way send itto think its good idea too Ill cover column full credit source way manufacturers can get idea inventor can get credit Let hear because know hundreds great ideas out just waiting publicized RC fliers pretty good aerodynamicists regardless backgrounds because theyve developed skills experience observa tions often become respected authorities clubs write articles club newsletters about airplanes fly Most time what see about aerodynamics club newsletters very good once real clinker incorrect although appears explain situation Recently saw explana tion dihedral works developing roll stability airplane Unfortunately ex planation wrong Ive heard read same wrong explanation times think its time clarify what really happens will also explain wings dihedral can used rudder roll turn airplane First let cover wrong explanation dihedral effect explanation hinges incorrect assumption lift always upward wings Figure 1 rolling effect lift canceled out opposite side wing However wing rolled Figure 2 lift wing panel acting surface effectively smaller other panel consequently rolling moment generated restores wing level condition reasoning appears explain dihedral can used generate roll stability wrong Lift wing does just act vertical direction fact airplane has no idea has rolled could hold airplane airstream roll about fuselage axis aligned local air velocity no rolling moment would generated So does dihedral work Dihedral effects requires two factors dihedral sideslip What happens airplane rolls Figure 3 component airplane weight direction low wing causes airplane slip direction sideslip causes change effective angle attack wing panels can easily visualize difference angle attack holding book open V moving sideslip different angles attack two panels causes rolling moment generated tends roll wings back level attitude wings level no longer component weight trying slip airplane stops sideslipping rolling moment goes away Thats dihedral stabilizes airplane roll Now what about rudder can used roll airplane dihedral wings rudder used yaw airplane causing sideslip As before sideslip generates rolling moment airplane rolls direction rudder moved way may have heard reason airplane rolls rudder because yawing airplane causes wing speed up other slow down speed difference causes different amounts lift generated rolls airplane does happen has much smaller effect dihedral has can easily demonstrated attempting roll Pattern airplanes rudder Pattern airplanes have little dihedral effect just skid along rudder deflected Last week bought myself late Christmas early birthday present am anxious build try out drooling over options available transmitters featuring new Signetics NE5044 encoder integrated circuit didnt really want give up Kraft KP August 1981 41 Continued page 120 Finish international orange butyrate dope flattener added over silkspan complete fuselage top cockpit removeable access engine drive train Weldon has made electric retract mechanisms operational sprung landing gear legs reservoir supplies air bladder wheel brakes cockpit well detailed including operating hand cranks lowering side windows Unquestionably fine example Precision Scale Giant Scale class 18 lb Vito Tomeos scratch-built 1/6-scale Hawker Sea Fury first place winner Military Stand-off class seen 18 lb 77-in span model flight last years Nats Dennis Bryll placed second P-47 Thunderbolt Third place Stand-off winner anotherfamiliar plane having won first place 77 80 Nats P-6 1 Black Widow Roger Brennom 195 lb plane scratch-built Wylam drawings foam balsa construction Hobbypoxy finish Three hand-made nonretractable gear legs have two springs Roger has recently installed new OS 60 engines seems well-tried flying planes making appearance Toledo Non military Stand-off Scale Starduster Too Terry Williams awarded first place Team Selection proposal has made select three Scale Teams Seguin Nats F4C Radio Control F4B Control-line Stand-off Radio Control though nation making bid 1982 World Champ ionship has USSR have elected omit Stand-off RC being proposed basis another nation may make attractive bid 1982 would include Stand off RC preparations must made send team eventuality Therefore modelers wish have entries considered three classes must have FAI stamp AMA licenses must pay FAI entry fee addition Nats entry fee must enter model complies FAI rules should noted FAI designation event Stand-off RC Scale US called RC Sport Scale no other nation makes successful bid 1982 World Championship FAI plenary session December USSR bid accepted refunds FAI program entry fee will made AMA headquarters upon appli cation Sport Scale RC Nats contestants serious effort being made least other nation outbid USSR Stand-off RC can included present far popular Scale event nations except USSR certainly deserves World Cham pionship status Bob andDolly Wischer Rt 1 S-22lLapham Peak Roa4 Delafiel4 WI 53018 RC Aerobatics/Van Putte Continued page 41 7Z transmitter because great sticks convenient trim pot locations So made compromise bought Ace Silver Seven encoder kit replace Kraft encoder As usual Fred Marks has done fine job Ace developing kit instructions assembly adjustment troubleshooting Ace suggests experienced kit build ers attempt retrofit encoder another transmitter However Ive experience assembling Ace Royal servo kits trouble shooting servo problems building Royal re ceiver installing dual rate switches KP-7Z transmitter Consequently lam optimis tic half-vast experience will carry through job course intend thing instructions say thoroughly read what George Myers wrote column Silver Seven transmitter August 1980 is6ue Model Aviation things work out well youll hear about what great job did dont work out Ill probably forget mention Ron Van Putte 111 Sleepy Oaks Rd Fort Walton Beach FL 32548 RC Giant Scale/Beckman Continued page 43 indicates commercial props 18-10 size will deliver 20 25 lb thrust 8000 rpm Its no wonder prop pulls Wendells Skybolt good authority whole subject propellers has become fascinating hadnt really put much thought started engine project quickly became apparent testing props much engines variables involved impossible really cover everything properly space well have available going through tremendous learning process ourselves just hope will able pass along Plan reviews month reviewing two plans available Taylorcraft Ltd have around about two years first saw prototypes Bill Wendts Fokker DVIII Ken Runestrands L-4B Morgan Hill 1979 first Giant Scale Fly-in literaly overwhelmed new impressions information two birds stood out Bills DVIII built scale sounds odd US modelers 1 ft 1 meter alittlelessthan one-third scale Bill worked European drawings metric dimensions easier converting exact one-third scale plans three sheets approxi mately 3 ft 6 ft clear easily read contain fair amount detail dont have much detail control surface hinging control hook-up however dont have experience area youll need some help obvious aircraft designed big bangers mind Materials construc tion techniques rugged Basic structures spruce plywood some balsa mostly weight critical wing employs beautiful set box spars built up -in square spruce 1/32-in ply wing separates center both wing locking strut attachment systems ingenious simple effective plans show Quadra original flew nicely cowl will accept almost currently available engines building Bills plans change would make use foam-core board some ribs formers rudder elevator cores already know Im hooked foam-core L-4B Grasshopper ubiquitous Piper Cub uniform Painted olive drab cabin windows extended behind wing used throughout WW II liaison observation aircraft Kens plans unusual can used modify existing kit Nosen Balsa USA manner builder selects cuts materials work kit sure make material changes indicated Kens plans Continued page 122 120 Model Aviation job heresonethatwill 37 Cu engine develops almost 4 hp yet weighs pound over Quadra has power pull Byron Pitta straight upwithout prop reduction also takes no space Quadrait will fit entirely inside cowl Nosen D unexposed stripped chain-saw motor engine manufactured USA miniature aircraft use Comes complete ready run year 100% warranty OMPLETE MODIFIED 37 ENGINE Lnul I. r.at ramoivgq Senu .ct MO COD UPS Add $400 shipping & Ia SCALE DOCUIVIENTATION SCALE DRAWHOTOS eOCKLETS IP REPLA-TECH 191 INTERNATIONAL CATALOGS $200 4SEOO MC KENZIE HWY VIDA OREGON 974B9
Edition: Model Aviation - 1981/08
Page Numbers: 40, 41, 120
Sport Aerobatics Ron Van Putte FOR THE PAST several issues monthly article taken up single subject change pace month Ill cover several different subjects Theres no particular reason except bunch ideas popped head reviewing packet club newsletters AMA sent Before moving various subjects Id like share gem included Cape Ann RC Model Club newsletter edited Lowell Warren Linguistic ItemDifference netween Glitch Glinch Glitch momentary signal radio interference affecting control plane Glinch priceless momentary expression pilots face during slightly after Glitch So thats what its called Having newsletter editor Western Ohio Radio Kontrol Society four years Eglin Aero Modellers Florida two years can appreciate hard work goes turning out club newsletter one-page newsletter has gathered master typed handwritten copies produced have addressed stamped mailed job usually falls club member enlists wife occasion ally kids help Club members enjoy receiving newsletter rarely offer assistance Thats surprised received Sport models have lots dihedraland usually no ailerons turn em rudder Ron tells us possible months column Pattern models usually have little no dihedral wont turn worth hoot just rudder input modified Sig Kadet used its builder Milt Hayes test bed various radios engines turned pipes Seen flO Afl OA ADO lrn pipe Photo Earl Bud Gay copy Flightitne newsletter GreaterLast night out practicing after work Cincinnati Radio Control Club bestPattern contest will held nextweekend newsletter Ive ever seen partly because isStrangely engine problems Actually chock full good items partly because itwas doubly strange because usually dont have has professional appearance mostly be-engine problems usually cause contributions 14 clubcontest So practice field members Congratulations Greater Cm-all time needed figure out what cinnati Radio Control Club Flightline Editorwrong turned out leaky carburetor J Wambach Jr superior jobI hope thebefore discovering pulled engine club members appreciate great newsletterand tank During process checked fuel havefilter reminded Id never mentioned method fixing leaky fuel filters fuel filters supplied fiber washer After short washers come hard brittle begin leak air 40 Model Aviation CeMENt filter go local hardware store ask see asortment neoprene 0rings found plumbing section perfect fit filter housing fuel use has never caused 0-rings deteriorate detectable manner fuel filter doesnt leak air would nice filter manufacturers would supply neoprene 0-rings instead crummy fiber washers brings up another item Weve got own pet wishes about RC products start out describingby saying would nice if. Weve often come up new idea built working example own use dont like go through hassle doing job over again time want another version good example device like would Ball Link dont know orginally came up idea useful Im glad Dewey Broberg Du-Bro markets because Id hate try make form scratch point manufacturers out just itching ideas products can marketed other side modelers would glad buy products available thats required way modelers get ideas mail send several likely manufacturers designer rarely gets publicity way example invented Ball Link Another way send itto think its good idea too Ill cover column full credit source way manufacturers can get idea inventor can get credit Let hear because know hundreds great ideas out just waiting publicized RC fliers pretty good aerodynamicists regardless backgrounds because theyve developed skills experience observa tions often become respected authorities clubs write articles club newsletters about airplanes fly Most time what see about aerodynamics club newsletters very good once real clinker incorrect although appears explain situation Recently saw explana tion dihedral works developing roll stability airplane Unfortunately ex planation wrong Ive heard read same wrong explanation times think its time clarify what really happens will also explain wings dihedral can used rudder roll turn airplane First let cover wrong explanation dihedral effect explanation hinges incorrect assumption lift always upward wings Figure 1 rolling effect lift canceled out opposite side wing However wing rolled Figure 2 lift wing panel acting surface effectively smaller other panel consequently rolling moment generated restores wing level condition reasoning appears explain dihedral can used generate roll stability wrong Lift wing does just act vertical direction fact airplane has no idea has rolled could hold airplane airstream roll about fuselage axis aligned local air velocity no rolling moment would generated So does dihedral work Dihedral effects requires two factors dihedral sideslip What happens airplane rolls Figure 3 component airplane weight direction low wing causes airplane slip direction sideslip causes change effective angle attack wing panels can easily visualize difference angle attack holding book open V moving sideslip different angles attack two panels causes rolling moment generated tends roll wings back level attitude wings level no longer component weight trying slip airplane stops sideslipping rolling moment goes away Thats dihedral stabilizes airplane roll Now what about rudder can used roll airplane dihedral wings rudder used yaw airplane causing sideslip As before sideslip generates rolling moment airplane rolls direction rudder moved way may have heard reason airplane rolls rudder because yawing airplane causes wing speed up other slow down speed difference causes different amounts lift generated rolls airplane does happen has much smaller effect dihedral has can easily demonstrated attempting roll Pattern airplanes rudder Pattern airplanes have little dihedral effect just skid along rudder deflected Last week bought myself late Christmas early birthday present am anxious build try out drooling over options available transmitters featuring new Signetics NE5044 encoder integrated circuit didnt really want give up Kraft KP August 1981 41 Continued page 120 Finish international orange butyrate dope flattener added over silkspan complete fuselage top cockpit removeable access engine drive train Weldon has made electric retract mechanisms operational sprung landing gear legs reservoir supplies air bladder wheel brakes cockpit well detailed including operating hand cranks lowering side windows Unquestionably fine example Precision Scale Giant Scale class 18 lb Vito Tomeos scratch-built 1/6-scale Hawker Sea Fury first place winner Military Stand-off class seen 18 lb 77-in span model flight last years Nats Dennis Bryll placed second P-47 Thunderbolt Third place Stand-off winner anotherfamiliar plane having won first place 77 80 Nats P-6 1 Black Widow Roger Brennom 195 lb plane scratch-built Wylam drawings foam balsa construction Hobbypoxy finish Three hand-made nonretractable gear legs have two springs Roger has recently installed new OS 60 engines seems well-tried flying planes making appearance Toledo Non military Stand-off Scale Starduster Too Terry Williams awarded first place Team Selection proposal has made select three Scale Teams Seguin Nats F4C Radio Control F4B Control-line Stand-off Radio Control though nation making bid 1982 World Champ ionship has USSR have elected omit Stand-off RC being proposed basis another nation may make attractive bid 1982 would include Stand off RC preparations must made send team eventuality Therefore modelers wish have entries considered three classes must have FAI stamp AMA licenses must pay FAI entry fee addition Nats entry fee must enter model complies FAI rules should noted FAI designation event Stand-off RC Scale US called RC Sport Scale no other nation makes successful bid 1982 World Championship FAI plenary session December USSR bid accepted refunds FAI program entry fee will made AMA headquarters upon appli cation Sport Scale RC Nats contestants serious effort being made least other nation outbid USSR Stand-off RC can included present far popular Scale event nations except USSR certainly deserves World Cham pionship status Bob andDolly Wischer Rt 1 S-22lLapham Peak Roa4 Delafiel4 WI 53018 RC Aerobatics/Van Putte Continued page 41 7Z transmitter because great sticks convenient trim pot locations So made compromise bought Ace Silver Seven encoder kit replace Kraft encoder As usual Fred Marks has done fine job Ace developing kit instructions assembly adjustment troubleshooting Ace suggests experienced kit build ers attempt retrofit encoder another transmitter However Ive experience assembling Ace Royal servo kits trouble shooting servo problems building Royal re ceiver installing dual rate switches KP-7Z transmitter Consequently lam optimis tic half-vast experience will carry through job course intend thing instructions say thoroughly read what George Myers wrote column Silver Seven transmitter August 1980 is6ue Model Aviation things work out well youll hear about what great job did dont work out Ill probably forget mention Ron Van Putte 111 Sleepy Oaks Rd Fort Walton Beach FL 32548 RC Giant Scale/Beckman Continued page 43 indicates commercial props 18-10 size will deliver 20 25 lb thrust 8000 rpm Its no wonder prop pulls Wendells Skybolt good authority whole subject propellers has become fascinating hadnt really put much thought started engine project quickly became apparent testing props much engines variables involved impossible really cover everything properly space well have available going through tremendous learning process ourselves just hope will able pass along Plan reviews month reviewing two plans available Taylorcraft Ltd have around about two years first saw prototypes Bill Wendts Fokker DVIII Ken Runestrands L-4B Morgan Hill 1979 first Giant Scale Fly-in literaly overwhelmed new impressions information two birds stood out Bills DVIII built scale sounds odd US modelers 1 ft 1 meter alittlelessthan one-third scale Bill worked European drawings metric dimensions easier converting exact one-third scale plans three sheets approxi mately 3 ft 6 ft clear easily read contain fair amount detail dont have much detail control surface hinging control hook-up however dont have experience area youll need some help obvious aircraft designed big bangers mind Materials construc tion techniques rugged Basic structures spruce plywood some balsa mostly weight critical wing employs beautiful set box spars built up -in square spruce 1/32-in ply wing separates center both wing locking strut attachment systems ingenious simple effective plans show Quadra original flew nicely cowl will accept almost currently available engines building Bills plans change would make use foam-core board some ribs formers rudder elevator cores already know Im hooked foam-core L-4B Grasshopper ubiquitous Piper Cub uniform Painted olive drab cabin windows extended behind wing used throughout WW II liaison observation aircraft Kens plans unusual can used modify existing kit Nosen Balsa USA manner builder selects cuts materials work kit sure make material changes indicated Kens plans Continued page 122 120 Model Aviation job heresonethatwill 37 Cu engine develops almost 4 hp yet weighs pound over Quadra has power pull Byron Pitta straight upwithout prop reduction also takes no space Quadrait will fit entirely inside cowl Nosen D unexposed stripped chain-saw motor engine manufactured USA miniature aircraft use Comes complete ready run year 100% warranty OMPLETE MODIFIED 37 ENGINE Lnul I. r.at ramoivgq Senu .ct MO COD UPS Add $400 shipping & Ia SCALE DOCUIVIENTATION SCALE DRAWHOTOS eOCKLETS IP REPLA-TECH 191 INTERNATIONAL CATALOGS $200 4SEOO MC KENZIE HWY VIDA OREGON 974B9