Control Line Speed Phill Bussell Formula 40 Speed Natural Airframe Design Lets quickly review rules applicable design air frame have no wing loading power loading cross sectional requirements contend model shall have fixed landing gear minimum wheel no single-line control systems al lowed Thats word wise Rat Fliers 1975 National Speed Director very lenient regards using rat lines Formula 40 Speed great because time Formula 40 Speed provisional eventin 1976 case 1976 Event Director may take dim view lengthening short lines line connectors safe variety have digested AMAs rules govern ing design now lets consider Phill Dubs rules rules have estab lished through 24 years competition Speed Flying Light Strong going win model must light going safe model stay together must strong light strong air frame should weigh no 26 ounces should last three four flying seasons careful wood selection construction finishing tech niques am sure can hold weight finished model less 24 ounces includes engine pan Balance fly properly model must balance properly tail-heavy will groove nose heavy will pull hard obviously go slower Theo retically want airframe light flying lines yet groove both calm windy weather balance point center gravity airframe should exactly flying lines come out wing tip Also bring lines out wing tip close together pos sible no further back high point airfoil model bal anced properly should able hang model flying lines nose should hang down nor should tail hang down Again nose model hangs down outside circle will pull excessively hard tail hangs down model will groove properly will hard fly properly groov ing model will always outrun erratic fly ing model obvious reasons Wings Airfoils High Point Taper Leading Edge Lets establish thing right now no matter fast go airframes still considered low speed comparison Low speed air frames operate better low speed air foils blunt leading edges inte gral part low speed airfoils have found through experience symmetri cal airfoil blunt leading edge works 30 Model Aviation Patrick Hempel receives Junior High Point Tro phy 1975 Southwestern Meet held Dallas over Labor Day weekend very well Flat bottom airfoils tend rise coming wind fall down wind side circle makes model hard groove especially windy weather some smaller models /2A sometimes B will use lifting airfoil nexer ing root symmetrical tip tends cut down angle attack model must fly create enough lift support aircraft honesty cant tell difference flying character istics models lifting section opposed symmetri cal section high point airfoil should somewhere between 25% 35% chord back leading edge critical aes thetic point view like taper wings airfoil section tip thinner root necessary go fast Blunt leading edges faster sharp leading edges reasons blunt leading edge critical control correction important want model groovecontinued page 100 Tom Upton flew Aquarius B Proto model first place Southwestern Campionshipsa fast 163 mph Readying C Speed ship Pan Am Aero Club meet Flushing Meadow Park NY last summer Frank Garzon plenty DONT POWER CYTM THE ORIGINAL IN PLANE BATTERY MONITOR Now fly confidence glance POWER-CyT instantly know charge condition battery pack Three times brighter other POWER-CyT__________________________________ goes off batteries 10 20 minute safety margin Detects bad cells Easy installation Weighs Va oz Guaranteed 1 year____________________ CYI4 INDUSTRIES 611 S East Ave. Oak Park II 60304 312 848-8555 Dealer Distributor inquiries invited FF Duration continued able Model Builder magazine plan no 1174OT $350 Stick Em patterns cost additional $195 Address Box 4336 Santa Ana Ca 92702 hunch might story hind big Lanzo machine asked George about wasnt wrong Old-Timer Rubber models have built Lanzo competi tive over 3 sq ft wing stab area weight 7 oz flies al well modern birds first met Chet Lanzo 1941 Nats Chicago 21-year-old Chet boyhood idol model ings all-time greats Chet took interest showed adjusted model asked about chased model him test flights great enthusi asm can remember wonder long motor runs fondly remember Chet Lanzo fine gentleman helped little country boy Georgia learn some fine points modeling Wilders Winder advice experts occasional opportunity borrow good winder made clear smooth-running winder great help putting maximum turns rubber motor breaking propensity los ing track number turns made clear next winder must have built-in turns counter After pondering problem designing building own specifications great relief discover could such winder paltry $2450 plus $100 postage handling charge Bob Wilder 2010 Boston Irving TX 75061 Bobs winder has 20-to-i ratio little higher normal door microfilm model type winder very high some other uses intended itindoor scale example winder having mini mum friction high ratio ad vantage gives stronger feel motor torque Wilder winder sports double reduction wide-face Nylon gears precision ball bearing output shaft ensure smooth run_PATENT PE ning under load winders seem smooth operated load nearly jam under tension fully wound motor counter simple dial-and-pointer affair reading 500 turns revolution pointer increments S turns going put say 1650 turns motor will have pay little atten tion avoid putting 1150 2150 stead counter re-set simply push ing pointer back zero position CL Speed/Bussell continued page 30 Close will find line drawing showing typical wing planform lifting section ing root symmetrical tips same wing planform symmetrical section sym metrical both root tip sec tion drawings airfoils drawn oversize show properly designed airfoil high point 33% back leading edge both airfoils Indoor microfilm type winder Bob Wilder see textl smooth running includes turn counter 20-to1 ratio sells $2450 unit intended serviced owner disassembly attempted gears shafts spacers washers tend fly over workshop Reassembly trial-and-error method enough make strong man cry servicing ever necessary highly unlikely sug gest send winder back Bob Wilder address 4200 Gregory St Oak land Calif 94619 Wing Stab Control Surfaces As Formula 40 Speed need least 90 sq in wing want come off ground hurry can use much 125 sq Stab area should no less 35% wing area no 50% same use same size elevator Class B B Proto Formula 40 Ships 3 long will give plenty control movement Speed flying BA--1TYPICAL WING PLANFORM e B LIFTING ROOT SECTION A-A TIP SECTION B-B 100 Model Aviation rSTANDARD. 1195 4BV DELUXE 95 win pigsi SYMMETRICAL Control SystemHorn Length Bellcrank Length Crank Arm Length Line Spacing Handle Close please refer line drawing complete control sys tem handle elevator horn experiment have found comfortable move wrist approxi mately 600 moving arm about wrist movement can expect have flying pylon need have also found through experience 300 up elevator 300 down elevator enough control model referring diagram plugging known num bers following formula can de termine appropriate length make control horn accomplish proper elevator control 600 wrist movement B AX D C Will give l-to-l ratio between angle wrist angle elevator Length B k Arm Length C crank Length D Spacing Handle Example Lets assume use flying handle 4 wide bellcrank 2 wide crank arm length ging numbers mula can solve proper horn length /2 2_ Now leave dimensions same move leadouts fly ing handle 2 can reduce horn length l maintain I-to-I handle-to-elevator ratio think interesting observe effect flyingline spacing control handle has entire control system Obviously control-line model whether Combat Racing Speed can made less sensi tive control change moving han dle leadouts closer together can change I-to-i ratio wrist elevator 21 using following formula 2B D by using same ex ample before will now have horn length 1 can see quickly leaving practical area regards horn length Since line B - x D 4 spacing handle easiest element change control system suggest U QUE PLANS FOR GAS MODELERS E NCLUDE PATTERNS 42 BOeing P-26A $14 00Oo.oP00 45 Boeing P4B3 P12 $9 36 kker Tripe OR $747 Cor Hook P6-E $15 B Spod XIII 510 47 Goohe.rk 91 1C-2 $15 39 C B Nieoporl 17 $9 47 CorrC Holidjoer $11 ill Pop$8 48 GIon Glodiolor $10 Sooor Boo IT $9 40 5 Koydel PT17 $10 ro FBI2B&C $11 50 Polioh FIr P6 $10 DIII Sooo $9 $2 Slinoor TW SB7 $10 Snipe7Pl 911 57 CorOlEFoloon $15 _________54$14 0ebO $1360$00803$080$12 64 Coo 03 Boo Kilo $10 63 OSkIrookelPSFl $14 107 Morlir MUl $20 97 Lind Look Sirioc $12 54Sopor SpilOre$13 MANY MANY MORE 48Me 1090 FIr$14ssNAM olin 825$20 S$o ER $25 30Hodeon $orbr71SoogIoc DC 3$25 * 50816 Widooc P51$1977Boo B 170 P01$ 51Boo B17G PorI$1548$Soggo C 78$ SIOr Wldoo P4P2$1549P Mo ng PA5$ 51Jookoro JU88$10Corn, $ 615 56C WorlrocoirP40015BESURE TO ADD20 47H Mr Moilloor$12EOR HANDLING SIN MODELDOMS QUICKE$T MAIL SRRVICR use horn length no shorter 9/ long model still doesnt groove properly start moving flying lines closer together handle next column will complete designs discuss construction finishing techniques hopefully get engines props fuel address 4803 Fallon P1 Dallas TX 75227 i to-Crafts Wing Skin CoverIng System eliminates necessity specIal tools heating devices home dryer 350500 Watts ample shrinking Wing Skin professional finish pair scissors sharp knife tube vinyl cement other requirements Now can easily quickly cover wings tail surfaces like professional less cost Seamless sleeve slips like sock No adhesive backingno wrinkles High film shrinkage great tapered wings Covering instructions included FUEL-PROOF RESISTANT CAN BE PAINTED BE PATCHED SHRINES UP TO 50% ACROSS CHORD OF TO 10% LINEARLY LESS SUPS OH LICE SOCE OR SLEEVE HEAT SHRINES TO FIT LICE DRUM REDUCES COVERIRD TIME HP TO 75% EXTRA STRUmS BRILLIANT FAST COLORS LIONT-WEIBIIT HER RESISTANT NO WRINELES OMICAL TAPERED SURFACES EASILY COVERED EXCELLENT FOR FOAM SHRITACES 4 WING SKIN MAIL ORDERS SENT POSTPAID BY. POLKS HOBBY DEPT STORES 314 FIFTH AVEDept MAy-56 NY NY 10001 Tel 212-279-9034 12072 FRONT ST EAST MEADOW Ll NY 11554 Tel 516-489-1166 May1976 101 flRUR whole wing RVSRIY Wits Rormal low temperature hair dryRr .. hair drye oo 0Apply heat again smooth out u, WE EJJIRUBR8 WSB YOU tips wing root ti Wing Skin achieve finish like DealerWholesaler AVAILABLE IN 6 COLORS IN 4 SLEEVE WIDThS Innuiries InvitRd Iamma*...I 314 Fifth Ave Red White Yellow Orange Dark Blue Translucent Blue NY MAy oo 7 Wide 4 Ft Long $200 12 Wide 6 Ft Long $450 BIBTINC9IVE MINIATBRESN V 100019 Wide 6 Ft Long 400 15 Wide 6 Ft Long 500
Edition: Model Aviation - 1976/05
Page Numbers: 30, 100, 101
Edition: Model Aviation - 1976/05
Page Numbers: 30, 100, 101
Control Line Speed Phill Bussell Formula 40 Speed Natural Airframe Design Lets quickly review rules applicable design air frame have no wing loading power loading cross sectional requirements contend model shall have fixed landing gear minimum wheel no single-line control systems al lowed Thats word wise Rat Fliers 1975 National Speed Director very lenient regards using rat lines Formula 40 Speed great because time Formula 40 Speed provisional eventin 1976 case 1976 Event Director may take dim view lengthening short lines line connectors safe variety have digested AMAs rules govern ing design now lets consider Phill Dubs rules rules have estab lished through 24 years competition Speed Flying Light Strong going win model must light going safe model stay together must strong light strong air frame should weigh no 26 ounces should last three four flying seasons careful wood selection construction finishing tech niques am sure can hold weight finished model less 24 ounces includes engine pan Balance fly properly model must balance properly tail-heavy will groove nose heavy will pull hard obviously go slower Theo retically want airframe light flying lines yet groove both calm windy weather balance point center gravity airframe should exactly flying lines come out wing tip Also bring lines out wing tip close together pos sible no further back high point airfoil model bal anced properly should able hang model flying lines nose should hang down nor should tail hang down Again nose model hangs down outside circle will pull excessively hard tail hangs down model will groove properly will hard fly properly groov ing model will always outrun erratic fly ing model obvious reasons Wings Airfoils High Point Taper Leading Edge Lets establish thing right now no matter fast go airframes still considered low speed comparison Low speed air frames operate better low speed air foils blunt leading edges inte gral part low speed airfoils have found through experience symmetri cal airfoil blunt leading edge works 30 Model Aviation Patrick Hempel receives Junior High Point Tro phy 1975 Southwestern Meet held Dallas over Labor Day weekend very well Flat bottom airfoils tend rise coming wind fall down wind side circle makes model hard groove especially windy weather some smaller models /2A sometimes B will use lifting airfoil nexer ing root symmetrical tip tends cut down angle attack model must fly create enough lift support aircraft honesty cant tell difference flying character istics models lifting section opposed symmetri cal section high point airfoil should somewhere between 25% 35% chord back leading edge critical aes thetic point view like taper wings airfoil section tip thinner root necessary go fast Blunt leading edges faster sharp leading edges reasons blunt leading edge critical control correction important want model groovecontinued page 100 Tom Upton flew Aquarius B Proto model first place Southwestern Campionshipsa fast 163 mph Readying C Speed ship Pan Am Aero Club meet Flushing Meadow Park NY last summer Frank Garzon plenty DONT POWER CYTM THE ORIGINAL IN PLANE BATTERY MONITOR Now fly confidence glance POWER-CyT instantly know charge condition battery pack Three times brighter other POWER-CyT__________________________________ goes off batteries 10 20 minute safety margin Detects bad cells Easy installation Weighs Va oz Guaranteed 1 year____________________ CYI4 INDUSTRIES 611 S East Ave. Oak Park II 60304 312 848-8555 Dealer Distributor inquiries invited FF Duration continued able Model Builder magazine plan no 1174OT $350 Stick Em patterns cost additional $195 Address Box 4336 Santa Ana Ca 92702 hunch might story hind big Lanzo machine asked George about wasnt wrong Old-Timer Rubber models have built Lanzo competi tive over 3 sq ft wing stab area weight 7 oz flies al well modern birds first met Chet Lanzo 1941 Nats Chicago 21-year-old Chet boyhood idol model ings all-time greats Chet took interest showed adjusted model asked about chased model him test flights great enthusi asm can remember wonder long motor runs fondly remember Chet Lanzo fine gentleman helped little country boy Georgia learn some fine points modeling Wilders Winder advice experts occasional opportunity borrow good winder made clear smooth-running winder great help putting maximum turns rubber motor breaking propensity los ing track number turns made clear next winder must have built-in turns counter After pondering problem designing building own specifications great relief discover could such winder paltry $2450 plus $100 postage handling charge Bob Wilder 2010 Boston Irving TX 75061 Bobs winder has 20-to-i ratio little higher normal door microfilm model type winder very high some other uses intended itindoor scale example winder having mini mum friction high ratio ad vantage gives stronger feel motor torque Wilder winder sports double reduction wide-face Nylon gears precision ball bearing output shaft ensure smooth run_PATENT PE ning under load winders seem smooth operated load nearly jam under tension fully wound motor counter simple dial-and-pointer affair reading 500 turns revolution pointer increments S turns going put say 1650 turns motor will have pay little atten tion avoid putting 1150 2150 stead counter re-set simply push ing pointer back zero position CL Speed/Bussell continued page 30 Close will find line drawing showing typical wing planform lifting section ing root symmetrical tips same wing planform symmetrical section sym metrical both root tip sec tion drawings airfoils drawn oversize show properly designed airfoil high point 33% back leading edge both airfoils Indoor microfilm type winder Bob Wilder see textl smooth running includes turn counter 20-to1 ratio sells $2450 unit intended serviced owner disassembly attempted gears shafts spacers washers tend fly over workshop Reassembly trial-and-error method enough make strong man cry servicing ever necessary highly unlikely sug gest send winder back Bob Wilder address 4200 Gregory St Oak land Calif 94619 Wing Stab Control Surfaces As Formula 40 Speed need least 90 sq in wing want come off ground hurry can use much 125 sq Stab area should no less 35% wing area no 50% same use same size elevator Class B B Proto Formula 40 Ships 3 long will give plenty control movement Speed flying BA--1TYPICAL WING PLANFORM e B LIFTING ROOT SECTION A-A TIP SECTION B-B 100 Model Aviation rSTANDARD. 1195 4BV DELUXE 95 win pigsi SYMMETRICAL Control SystemHorn Length Bellcrank Length Crank Arm Length Line Spacing Handle Close please refer line drawing complete control sys tem handle elevator horn experiment have found comfortable move wrist approxi mately 600 moving arm about wrist movement can expect have flying pylon need have also found through experience 300 up elevator 300 down elevator enough control model referring diagram plugging known num bers following formula can de termine appropriate length make control horn accomplish proper elevator control 600 wrist movement B AX D C Will give l-to-l ratio between angle wrist angle elevator Length B k Arm Length C crank Length D Spacing Handle Example Lets assume use flying handle 4 wide bellcrank 2 wide crank arm length ging numbers mula can solve proper horn length /2 2_ Now leave dimensions same move leadouts fly ing handle 2 can reduce horn length l maintain I-to-I handle-to-elevator ratio think interesting observe effect flyingline spacing control handle has entire control system Obviously control-line model whether Combat Racing Speed can made less sensi tive control change moving han dle leadouts closer together can change I-to-i ratio wrist elevator 21 using following formula 2B D by using same ex ample before will now have horn length 1 can see quickly leaving practical area regards horn length Since line B - x D 4 spacing handle easiest element change control system suggest U QUE PLANS FOR GAS MODELERS E NCLUDE PATTERNS 42 BOeing P-26A $14 00Oo.oP00 45 Boeing P4B3 P12 $9 36 kker Tripe OR $747 Cor Hook P6-E $15 B Spod XIII 510 47 Goohe.rk 91 1C-2 $15 39 C B Nieoporl 17 $9 47 CorrC Holidjoer $11 ill Pop$8 48 GIon Glodiolor $10 Sooor Boo IT $9 40 5 Koydel PT17 $10 ro FBI2B&C $11 50 Polioh FIr P6 $10 DIII Sooo $9 $2 Slinoor TW SB7 $10 Snipe7Pl 911 57 CorOlEFoloon $15 _________54$14 0ebO $1360$00803$080$12 64 Coo 03 Boo Kilo $10 63 OSkIrookelPSFl $14 107 Morlir MUl $20 97 Lind Look Sirioc $12 54Sopor SpilOre$13 MANY MANY MORE 48Me 1090 FIr$14ssNAM olin 825$20 S$o ER $25 30Hodeon $orbr71SoogIoc DC 3$25 * 50816 Widooc P51$1977Boo B 170 P01$ 51Boo B17G PorI$1548$Soggo C 78$ SIOr Wldoo P4P2$1549P Mo ng PA5$ 51Jookoro JU88$10Corn, $ 615 56C WorlrocoirP40015BESURE TO ADD20 47H Mr Moilloor$12EOR HANDLING SIN MODELDOMS QUICKE$T MAIL SRRVICR use horn length no shorter 9/ long model still doesnt groove properly start moving flying lines closer together handle next column will complete designs discuss construction finishing techniques hopefully get engines props fuel address 4803 Fallon P1 Dallas TX 75227 i to-Crafts Wing Skin CoverIng System eliminates necessity specIal tools heating devices home dryer 350500 Watts ample shrinking Wing Skin professional finish pair scissors sharp knife tube vinyl cement other requirements Now can easily quickly cover wings tail surfaces like professional less cost Seamless sleeve slips like sock No adhesive backingno wrinkles High film shrinkage great tapered wings Covering instructions included FUEL-PROOF RESISTANT CAN BE PAINTED BE PATCHED SHRINES UP TO 50% ACROSS CHORD OF TO 10% LINEARLY LESS SUPS OH LICE SOCE OR SLEEVE HEAT SHRINES TO FIT LICE DRUM REDUCES COVERIRD TIME HP TO 75% EXTRA STRUmS BRILLIANT FAST COLORS LIONT-WEIBIIT HER RESISTANT NO WRINELES OMICAL TAPERED SURFACES EASILY COVERED EXCELLENT FOR FOAM SHRITACES 4 WING SKIN MAIL ORDERS SENT POSTPAID BY. POLKS HOBBY DEPT STORES 314 FIFTH AVEDept MAy-56 NY NY 10001 Tel 212-279-9034 12072 FRONT ST EAST MEADOW Ll NY 11554 Tel 516-489-1166 May1976 101 flRUR whole wing RVSRIY Wits Rormal low temperature hair dryRr .. hair drye oo 0Apply heat again smooth out u, WE EJJIRUBR8 WSB YOU tips wing root ti Wing Skin achieve finish like DealerWholesaler AVAILABLE IN 6 COLORS IN 4 SLEEVE WIDThS Innuiries InvitRd Iamma*...I 314 Fifth Ave Red White Yellow Orange Dark Blue Translucent Blue NY MAy oo 7 Wide 4 Ft Long $200 12 Wide 6 Ft Long $450 BIBTINC9IVE MINIATBRESN V 100019 Wide 6 Ft Long 400 15 Wide 6 Ft Long 500
Edition: Model Aviation - 1976/05
Page Numbers: 30, 100, 101
Control Line Speed Phill Bussell Formula 40 Speed Natural Airframe Design Lets quickly review rules applicable design air frame have no wing loading power loading cross sectional requirements contend model shall have fixed landing gear minimum wheel no single-line control systems al lowed Thats word wise Rat Fliers 1975 National Speed Director very lenient regards using rat lines Formula 40 Speed great because time Formula 40 Speed provisional eventin 1976 case 1976 Event Director may take dim view lengthening short lines line connectors safe variety have digested AMAs rules govern ing design now lets consider Phill Dubs rules rules have estab lished through 24 years competition Speed Flying Light Strong going win model must light going safe model stay together must strong light strong air frame should weigh no 26 ounces should last three four flying seasons careful wood selection construction finishing tech niques am sure can hold weight finished model less 24 ounces includes engine pan Balance fly properly model must balance properly tail-heavy will groove nose heavy will pull hard obviously go slower Theo retically want airframe light flying lines yet groove both calm windy weather balance point center gravity airframe should exactly flying lines come out wing tip Also bring lines out wing tip close together pos sible no further back high point airfoil model bal anced properly should able hang model flying lines nose should hang down nor should tail hang down Again nose model hangs down outside circle will pull excessively hard tail hangs down model will groove properly will hard fly properly groov ing model will always outrun erratic fly ing model obvious reasons Wings Airfoils High Point Taper Leading Edge Lets establish thing right now no matter fast go airframes still considered low speed comparison Low speed air frames operate better low speed air foils blunt leading edges inte gral part low speed airfoils have found through experience symmetri cal airfoil blunt leading edge works 30 Model Aviation Patrick Hempel receives Junior High Point Tro phy 1975 Southwestern Meet held Dallas over Labor Day weekend very well Flat bottom airfoils tend rise coming wind fall down wind side circle makes model hard groove especially windy weather some smaller models /2A sometimes B will use lifting airfoil nexer ing root symmetrical tip tends cut down angle attack model must fly create enough lift support aircraft honesty cant tell difference flying character istics models lifting section opposed symmetri cal section high point airfoil should somewhere between 25% 35% chord back leading edge critical aes thetic point view like taper wings airfoil section tip thinner root necessary go fast Blunt leading edges faster sharp leading edges reasons blunt leading edge critical control correction important want model groovecontinued page 100 Tom Upton flew Aquarius B Proto model first place Southwestern Campionshipsa fast 163 mph Readying C Speed ship Pan Am Aero Club meet Flushing Meadow Park NY last summer Frank Garzon plenty DONT POWER CYTM THE ORIGINAL IN PLANE BATTERY MONITOR Now fly confidence glance POWER-CyT instantly know charge condition battery pack Three times brighter other POWER-CyT__________________________________ goes off batteries 10 20 minute safety margin Detects bad cells Easy installation Weighs Va oz Guaranteed 1 year____________________ CYI4 INDUSTRIES 611 S East Ave. Oak Park II 60304 312 848-8555 Dealer Distributor inquiries invited FF Duration continued able Model Builder magazine plan no 1174OT $350 Stick Em patterns cost additional $195 Address Box 4336 Santa Ana Ca 92702 hunch might story hind big Lanzo machine asked George about wasnt wrong Old-Timer Rubber models have built Lanzo competi tive over 3 sq ft wing stab area weight 7 oz flies al well modern birds first met Chet Lanzo 1941 Nats Chicago 21-year-old Chet boyhood idol model ings all-time greats Chet took interest showed adjusted model asked about chased model him test flights great enthusi asm can remember wonder long motor runs fondly remember Chet Lanzo fine gentleman helped little country boy Georgia learn some fine points modeling Wilders Winder advice experts occasional opportunity borrow good winder made clear smooth-running winder great help putting maximum turns rubber motor breaking propensity los ing track number turns made clear next winder must have built-in turns counter After pondering problem designing building own specifications great relief discover could such winder paltry $2450 plus $100 postage handling charge Bob Wilder 2010 Boston Irving TX 75061 Bobs winder has 20-to-i ratio little higher normal door microfilm model type winder very high some other uses intended itindoor scale example winder having mini mum friction high ratio ad vantage gives stronger feel motor torque Wilder winder sports double reduction wide-face Nylon gears precision ball bearing output shaft ensure smooth run_PATENT PE ning under load winders seem smooth operated load nearly jam under tension fully wound motor counter simple dial-and-pointer affair reading 500 turns revolution pointer increments S turns going put say 1650 turns motor will have pay little atten tion avoid putting 1150 2150 stead counter re-set simply push ing pointer back zero position CL Speed/Bussell continued page 30 Close will find line drawing showing typical wing planform lifting section ing root symmetrical tips same wing planform symmetrical section sym metrical both root tip sec tion drawings airfoils drawn oversize show properly designed airfoil high point 33% back leading edge both airfoils Indoor microfilm type winder Bob Wilder see textl smooth running includes turn counter 20-to1 ratio sells $2450 unit intended serviced owner disassembly attempted gears shafts spacers washers tend fly over workshop Reassembly trial-and-error method enough make strong man cry servicing ever necessary highly unlikely sug gest send winder back Bob Wilder address 4200 Gregory St Oak land Calif 94619 Wing Stab Control Surfaces As Formula 40 Speed need least 90 sq in wing want come off ground hurry can use much 125 sq Stab area should no less 35% wing area no 50% same use same size elevator Class B B Proto Formula 40 Ships 3 long will give plenty control movement Speed flying BA--1TYPICAL WING PLANFORM e B LIFTING ROOT SECTION A-A TIP SECTION B-B 100 Model Aviation rSTANDARD. 1195 4BV DELUXE 95 win pigsi SYMMETRICAL Control SystemHorn Length Bellcrank Length Crank Arm Length Line Spacing Handle Close please refer line drawing complete control sys tem handle elevator horn experiment have found comfortable move wrist approxi mately 600 moving arm about wrist movement can expect have flying pylon need have also found through experience 300 up elevator 300 down elevator enough control model referring diagram plugging known num bers following formula can de termine appropriate length make control horn accomplish proper elevator control 600 wrist movement B AX D C Will give l-to-l ratio between angle wrist angle elevator Length B k Arm Length C crank Length D Spacing Handle Example Lets assume use flying handle 4 wide bellcrank 2 wide crank arm length ging numbers mula can solve proper horn length /2 2_ Now leave dimensions same move leadouts fly ing handle 2 can reduce horn length l maintain I-to-I handle-to-elevator ratio think interesting observe effect flyingline spacing control handle has entire control system Obviously control-line model whether Combat Racing Speed can made less sensi tive control change moving han dle leadouts closer together can change I-to-i ratio wrist elevator 21 using following formula 2B D by using same ex ample before will now have horn length 1 can see quickly leaving practical area regards horn length Since line B - x D 4 spacing handle easiest element change control system suggest U QUE PLANS FOR GAS MODELERS E NCLUDE PATTERNS 42 BOeing P-26A $14 00Oo.oP00 45 Boeing P4B3 P12 $9 36 kker Tripe OR $747 Cor Hook P6-E $15 B Spod XIII 510 47 Goohe.rk 91 1C-2 $15 39 C B Nieoporl 17 $9 47 CorrC Holidjoer $11 ill Pop$8 48 GIon Glodiolor $10 Sooor Boo IT $9 40 5 Koydel PT17 $10 ro FBI2B&C $11 50 Polioh FIr P6 $10 DIII Sooo $9 $2 Slinoor TW SB7 $10 Snipe7Pl 911 57 CorOlEFoloon $15 _________54$14 0ebO $1360$00803$080$12 64 Coo 03 Boo Kilo $10 63 OSkIrookelPSFl $14 107 Morlir MUl $20 97 Lind Look Sirioc $12 54Sopor SpilOre$13 MANY MANY MORE 48Me 1090 FIr$14ssNAM olin 825$20 S$o ER $25 30Hodeon $orbr71SoogIoc DC 3$25 * 50816 Widooc P51$1977Boo B 170 P01$ 51Boo B17G PorI$1548$Soggo C 78$ SIOr Wldoo P4P2$1549P Mo ng PA5$ 51Jookoro JU88$10Corn, $ 615 56C WorlrocoirP40015BESURE TO ADD20 47H Mr Moilloor$12EOR HANDLING SIN MODELDOMS QUICKE$T MAIL SRRVICR use horn length no shorter 9/ long model still doesnt groove properly start moving flying lines closer together handle next column will complete designs discuss construction finishing techniques hopefully get engines props fuel address 4803 Fallon P1 Dallas TX 75227 i to-Crafts Wing Skin CoverIng System eliminates necessity specIal tools heating devices home dryer 350500 Watts ample shrinking Wing Skin professional finish pair scissors sharp knife tube vinyl cement other requirements Now can easily quickly cover wings tail surfaces like professional less cost Seamless sleeve slips like sock No adhesive backingno wrinkles High film shrinkage great tapered wings Covering instructions included FUEL-PROOF RESISTANT CAN BE PAINTED BE PATCHED SHRINES UP TO 50% ACROSS CHORD OF TO 10% LINEARLY LESS SUPS OH LICE SOCE OR SLEEVE HEAT SHRINES TO FIT LICE DRUM REDUCES COVERIRD TIME HP TO 75% EXTRA STRUmS BRILLIANT FAST COLORS LIONT-WEIBIIT HER RESISTANT NO WRINELES OMICAL TAPERED SURFACES EASILY COVERED EXCELLENT FOR FOAM SHRITACES 4 WING SKIN MAIL ORDERS SENT POSTPAID BY. POLKS HOBBY DEPT STORES 314 FIFTH AVEDept MAy-56 NY NY 10001 Tel 212-279-9034 12072 FRONT ST EAST MEADOW Ll NY 11554 Tel 516-489-1166 May1976 101 flRUR whole wing RVSRIY Wits Rormal low temperature hair dryRr .. hair drye oo 0Apply heat again smooth out u, WE EJJIRUBR8 WSB YOU tips wing root ti Wing Skin achieve finish like DealerWholesaler AVAILABLE IN 6 COLORS IN 4 SLEEVE WIDThS Innuiries InvitRd Iamma*...I 314 Fifth Ave Red White Yellow Orange Dark Blue Translucent Blue NY MAy oo 7 Wide 4 Ft Long $200 12 Wide 6 Ft Long $450 BIBTINC9IVE MINIATBRESN V 100019 Wide 6 Ft Long 400 15 Wide 6 Ft Long 500
