Using Bill Browns twin cylinder engine modified Comet kit proves gratifying performer George Gurney 7414OWOCYLNOO BROWN JR / /1 pc*OOO It-RO P THE INCENTIVE attempting CO powered indoor RC came time State College RC Club Pa submitted Bill Browns name Hall Fame award Bill flying small airplanes CO2 engines years clubs annual Delta-Dart Centre Region Indoor Meet thought RC flight using latest model CO2 en gine might complement awards cere mony should nomination accepted Bill inducted AMA Hall Fame indoor RC CO powered flight made looking suitable plane members local Jr model ing club brought 54 Comet Taylorcraft meetings thought kit looked about right project Kdoor about undertake After looking few kits decided Taylorcraft about great wing area could find span kit selected Comet Taylorcraft No 3505 wing span 54 chord 8 wing area 432 sq 3 sq ft Since ability Brown Jr two cyl inder CO2 engine provide thrust fly airplane unknown further light wing loading necessary assure slow flying plane philosophy building obvious build light Based guess/estimated wing loading 3 4 oz/ft2 projected model weight 9 12 oz Certain weights already known easily determined twin-cylinder engine eight aluminum tanks copper tubing 912 prop firewall Taybroraft tank holder measured calcu lated weigh 175 oz advertised weight lightest RC two-channel sys tem Cannon Tini-Twin 225 Ma battery 460 oz totals 625 oz plane wasnt built yet Nevertheless kit bought work begun problem areas associated fuselage seemed I Modifications nose CO2 engine 2 Reinforcing landing gear take added weight RC gear en gine etc 3 Addition structure support RC gear battery switch 4 Accessibility RC equipment 5 Overall weight 40 Model Aviation George Gurney end 54 Taylorcraft occasion ex citing demonstration ambition loop What next surprising often kit modified various events Refilling capsules another flight Author suggests advising manufacturer order twin RCa slight modification made Radio Cannon Tini Twin R E Past experience RC airplanes pro vided answers Photo No shows engine assembly made unit facilitate ease removal also could bench tested being installed airplane firewall 1/16 plywood tank holder 1/2 X 1 1/8 X 2 5/16 common pine drilled out eight /2-diameter tanks Holes 9/16 centers fire wall fastened forward bulkhead three small screws shown photo No2 engine cowling carved solid block balsa hollowed out 1/16 1/8 wall except 8-32 plastic oval-head screws fasten cowl forward bulkhead Photo No 3 shows cowl covering engine landing gear made 1/16 plywood shaped shown photo No 4 axle 042 OD X 025 ID tubing epoxied plywood land ing gear glass-headed pin epoxied end tubing hold Trexler No 6 wheels wood hubs Trexler wheels drilled out faced off both sides 1/32 plywood glued hub ends sanded shape drilled accept axle sketch shows above modifications support landing gear fuselage 1/16 X 1/8 slot cut 3/8 sq balsa piece piece glued fuse lage sketch shows relationship gear balsa piece receiverbattery platform reinforces land ing gear assembly DRILLED OUT HUB RACED OFF 1/32 PLYWOOD BOTH ENDS GLUED TO HUB SAND B DRILL BOTH ENDS LANDING GEAR 1/16 PLYWOOD Since RC airplanes use detach able wing access radio through opening seemed reasonable plane Therefore opening formed over cabin area rein forced shown photo No 5 leading edge wing back end overhead windshield built fuselage seemed like good detachment point leading edge supported windshield struts fastened cowl front windshield Photo No6 shows struts build plane light yet strong always difficult reason de cided use 3/32 sq balsa main framework instead 1/8 sq called plans Much door details well rubber motor reinforcement rear fuselage omitted Fuselage bulkhead F-I should have made 1/16 plywood instead balsa shown photo No 7 F-2 F-3 instru ment panel F-4 copied 1/16 contest balsa used place wood provided kit Curved stringers nose N-I through N-4 also made using contest balsa four windshield braces extending leading edge wing cut through 1/32 sheet ed cowl glued underside cowl bulkhead F-3 other string ers / 16 X 1/8 installed according plans except wing opening terminated rear edge opening turn page October1975 41 1 MJ 140 Brown Jr C02 engine mounted firewall CO2 tanks fit snugly 1/2 diam eter holes 5 Wing dowels 8-32 tapped holes trailing edge hold-down screws 1/8 side ply doublers underside holes 4 Landing gear Trexler #6 wheels 012 music wire bracing wire Wheel axle epoxied plywood 2 Engine tank module fastened three 1/4 long screws forward bulkhead 6 Tiny Twin receiver-servo end 225ma battery Styrofoam cutout snug fit 1/16 sheet balsa cutout switch 3 Balsa cowling 9-1/2 Paulownis hard wood prop Isanded down 10 stock size RC CO2 Indoor Taylorcraft problems associated wing follows Modifications required piece construction 2 Wing Attachment 3 Covering 4 Weight one-piece construction easy since plans showed wing center sec tion dihedral formers separately constructed item fastened fuselage top center section merely glued thetwo wing halves form piece wing wing attached fuselage two 3/16 dowels two 8-32 plastic screws dowels screws holes can seen photo S plans show two large spars running length wingspan under side wing forward spar being inserted center section dihedral former plans also show half ribs tween main rib Both large spars half ribs deleted order make curved upper surface easier cover three 1/8 balsa spars used top wing surface can seen photo No 8 lower surface two 1/8 spars used instead large spars shown plans 3/16 X 3/8 spar used second inboard rib still used engage dihe dral former center section can seen photos No 9 10 con struction involving ailerons omitted wing tips W-l through W-4 copied 1/8 contest balsa used instead wood supplied kit main ribs modified spar changes also lighter stronger trailing-edge construction sketch shows 1/32 sheet balsa used accomplish 1/16 BALSA RIBS 1/32 BALSA BUILT-UP TRAILING EDGE tail made according plans except use 3/32 sq balsa stead 1/8 balsa R-l through R-5 E-l through E-8 made contest balsa Thread used hinges usual manner cotton swab sticks glued place elevator rudder horns Photos No II 12 show details RC installation inch styrofoam glued platform appropriate cut outs equipment As can seen photo Nos 5 13 pull-pull string used actuate control surfaces cross arms rear cabin cross arm pieces connected servos cotton swab-wood sticks Goldberg snapr keepers press fitted both ends sticks Short pieces 1/16 dia music wire tight fit servo fitting snapr keeper snapped onto wire switch mounted 1/16 balsa sheet photo No 6 The antenna wrapped time around styrofoam stuffed aft end fuselage Photo No 14 shows strings exiting fuselage controlling elevator entire plane covered water shrink tissue except silk used over curved stringers N-I N-4 nose using clear dope stick tissue framework No other dope applied tissuecontinued page 80 42 Model Aviation 9 Bottom View wing showing main spar terminating second inboard rib Two 1/8 spars extend base rib tip 7 Main bulkhead cutout engine-tank mod ule 1/16 plywood Balsa used required plywood doublers back engine cowl holes 12 Typical string hinges sewn figure 8 style per RC practice 10 Main sear fits between two 1/8 sq balsa pieces glued dihedral former per kit plans 8 Top view wing showing three 1/8 balsa spars Kit construction half ribs no spars upper surface 13 How servos connected wooden drive arms control cables 14 Empennage showing elevator control 11 Cotton swab stick rudder elevator wires entering fuselage through 1/16 balsa horns Scale-type control cables show clearly filler piece FULL-SIZE PLANS No 114Ernie Violetts D H Comet CL Scale 1974 Nats first-place winner twin flies beautifully No 115Nina An RC pattern job takes advantage best existing criteria No 116Electro-Lite Hal Covers contest-type free flight VTOsHytork electric motor No 117Novice simple beginners A-i Nordic constructed entirely sheet balsa No 118Gollygeewhiz Dan Rutherfords Half-A powered Combat job turns dime No 100Hinnants F-5$450 ultimate maneuverability smoothness 60 Pattern lob has No101Short Seamew $300 40-powered class carrier model good prototype lends itself innovations No102French Wench $225 Free Flight Classes 1/2A 049 051 fully tested design No 103Kloud King S400 15-19 RC Old-Timer Free Flight based upon 1938 record breaker FF No 104Wiley Post Biplane $225 Petite durable scale design either rubber tail wagger Ipulse rudderl No 105Harold Ruarks Sportsman $450 dream RC cabin iob pretty smooth lines 40 powered fullhouse No 106Vought Kingfisher $450 semi-scale fully stuntable Control Line model Las King IFor 25 35 enginesl $900 $400 $150 $150 $150 No 107Aeronca K$200 24 wingspan rubber Indoor Scale lob old-time lghtplane Its done 90 seconds No108Electric $375 Couldns done Dick Sarpolus Astro 25 RC lob performs pattern No 109Bill Fuoris Quarter Midget $300 Developed House Balsa design modifications faster times No 110The Zipper $175 latest CL Scale Racers John Kils donk lob must racing fans No111Max-A-Million $375 fleet free flights problem good A/B FAI No112Sneat $275 Sport RC glider simple lob can flown engine No113Cessna 150 Acrobat $275 Step up Half-A CL iobs 09-powered semi-profile easy build fly rnrnmmmmmmmm Circle numbers plans wish order 105 106107 112113 108 114115 100101 102103104 109110 111 116117118 P/ease print carefully Enclosed $ NAME STREET CITY STATE 710 Price includes hrst-class postage Send check money order payable Model Aviation AMA 806 Fifteenth St. NW. Washington DC 20005 MOVING T US KNOWI WHERE YOU ARE GOINGI COMPLETETHISWhen move please let us know advancesix weeks re CARD AND ATTACHquired change address Attach current MA mailing labelI MAILING LABELin space check appropriate box below mail toI Subscription Dept. Model Aviation 806 Fifteenth St. NW. RECENTWashington DC ~ate boxenclose CheckI IC CHANGE OF ADDRESS0 NEW SUBSCRIPTION Non-AMA subscription rates $1200 12 months Canada United States possessions elsewhere $1400 Membership AMA includes subscription see separate applica- tion issue NAME ADDRESS CITY/STATE71 P____________________ L MODEL AVIATION 806 FIFTEENTH ST. NW. WASHINGTON DC 20005 J RC CO2 Indoor Taylorcral continued page 42 final weights Wing 180 oz fuselage empennage control yokes strings styrofoam receiver battet holder288 oz batteryl9 oz Cat non Tini-Twin-322 oz Total weight w 1135 oz 385 oz per square ft Flying I no trouble balancing di plane since radio weighed tha plane slight shift radi resulted significant change CG k cation After several trial flights th help &f Bill Brown able tak plane off fly several times aroun Penn State Recreation Hall Gymn sium Bill change timing th engine obtain power wants try CO2 indoor RC shoul specify its use RC ordering hi engine considers during th building process known th little CO2 would pull plane off th ground results very gratifyin goal loop think b next year will done Several improvk ments already can made especially started over Hot Stuff glue would say weight time Bill has several ideas o extract power out CC charge no means ide propeller used Quality propellers dil ferent pitches easily available intends use large quantities CC should buy 5- 10-pound CO2 fir extinguisher buy adaptor Bi] Brown small CO sparklets would ge expensive Using modified engine 10 wood prop cut down 91/2 en gine turned over 2200 2400 rpm initial burst soon settled down F 1400 1500 rpm majority th flight plane landed under power ani could taxied back pit area usin rudder control ADVERTISERS INDEX ACe Radio Control Inc Andrews Aircraft Model Company7 AMA PR Cleveland Model & Supply Co Concept Models61 Du-Bro Products Inc Emerson Electric J T Finley Co Distributors Carl Goldberg Models Grish Brothers G-S Products Corp Intl jefs Friends K&S Engineering Peck-Polymers7 Satellite City71 Sig Mfg Company Sterling Models Inc Superscale71 TeleCraft7 VI Products7 Williams Brothers7 World Engines. 68 72 Back Cove 20/20 Graphics71 80 Model Aviation
Edition: Model Aviation - 1975/10
Page Numbers: 40, 41, 42, 80
Using Bill Browns twin cylinder engine modified Comet kit proves gratifying performer George Gurney 7414OWOCYLNOO BROWN JR / /1 pc*OOO It-RO P THE INCENTIVE attempting CO powered indoor RC came time State College RC Club Pa submitted Bill Browns name Hall Fame award Bill flying small airplanes CO2 engines years clubs annual Delta-Dart Centre Region Indoor Meet thought RC flight using latest model CO2 en gine might complement awards cere mony should nomination accepted Bill inducted AMA Hall Fame indoor RC CO powered flight made looking suitable plane members local Jr model ing club brought 54 Comet Taylorcraft meetings thought kit looked about right project Kdoor about undertake After looking few kits decided Taylorcraft about great wing area could find span kit selected Comet Taylorcraft No 3505 wing span 54 chord 8 wing area 432 sq 3 sq ft Since ability Brown Jr two cyl inder CO2 engine provide thrust fly airplane unknown further light wing loading necessary assure slow flying plane philosophy building obvious build light Based guess/estimated wing loading 3 4 oz/ft2 projected model weight 9 12 oz Certain weights already known easily determined twin-cylinder engine eight aluminum tanks copper tubing 912 prop firewall Taybroraft tank holder measured calcu lated weigh 175 oz advertised weight lightest RC two-channel sys tem Cannon Tini-Twin 225 Ma battery 460 oz totals 625 oz plane wasnt built yet Nevertheless kit bought work begun problem areas associated fuselage seemed I Modifications nose CO2 engine 2 Reinforcing landing gear take added weight RC gear en gine etc 3 Addition structure support RC gear battery switch 4 Accessibility RC equipment 5 Overall weight 40 Model Aviation George Gurney end 54 Taylorcraft occasion ex citing demonstration ambition loop What next surprising often kit modified various events Refilling capsules another flight Author suggests advising manufacturer order twin RCa slight modification made Radio Cannon Tini Twin R E Past experience RC airplanes pro vided answers Photo No shows engine assembly made unit facilitate ease removal also could bench tested being installed airplane firewall 1/16 plywood tank holder 1/2 X 1 1/8 X 2 5/16 common pine drilled out eight /2-diameter tanks Holes 9/16 centers fire wall fastened forward bulkhead three small screws shown photo No2 engine cowling carved solid block balsa hollowed out 1/16 1/8 wall except 8-32 plastic oval-head screws fasten cowl forward bulkhead Photo No 3 shows cowl covering engine landing gear made 1/16 plywood shaped shown photo No 4 axle 042 OD X 025 ID tubing epoxied plywood land ing gear glass-headed pin epoxied end tubing hold Trexler No 6 wheels wood hubs Trexler wheels drilled out faced off both sides 1/32 plywood glued hub ends sanded shape drilled accept axle sketch shows above modifications support landing gear fuselage 1/16 X 1/8 slot cut 3/8 sq balsa piece piece glued fuse lage sketch shows relationship gear balsa piece receiverbattery platform reinforces land ing gear assembly DRILLED OUT HUB RACED OFF 1/32 PLYWOOD BOTH ENDS GLUED TO HUB SAND B DRILL BOTH ENDS LANDING GEAR 1/16 PLYWOOD Since RC airplanes use detach able wing access radio through opening seemed reasonable plane Therefore opening formed over cabin area rein forced shown photo No 5 leading edge wing back end overhead windshield built fuselage seemed like good detachment point leading edge supported windshield struts fastened cowl front windshield Photo No6 shows struts build plane light yet strong always difficult reason de cided use 3/32 sq balsa main framework instead 1/8 sq called plans Much door details well rubber motor reinforcement rear fuselage omitted Fuselage bulkhead F-I should have made 1/16 plywood instead balsa shown photo No 7 F-2 F-3 instru ment panel F-4 copied 1/16 contest balsa used place wood provided kit Curved stringers nose N-I through N-4 also made using contest balsa four windshield braces extending leading edge wing cut through 1/32 sheet ed cowl glued underside cowl bulkhead F-3 other string ers / 16 X 1/8 installed according plans except wing opening terminated rear edge opening turn page October1975 41 1 MJ 140 Brown Jr C02 engine mounted firewall CO2 tanks fit snugly 1/2 diam eter holes 5 Wing dowels 8-32 tapped holes trailing edge hold-down screws 1/8 side ply doublers underside holes 4 Landing gear Trexler #6 wheels 012 music wire bracing wire Wheel axle epoxied plywood 2 Engine tank module fastened three 1/4 long screws forward bulkhead 6 Tiny Twin receiver-servo end 225ma battery Styrofoam cutout snug fit 1/16 sheet balsa cutout switch 3 Balsa cowling 9-1/2 Paulownis hard wood prop Isanded down 10 stock size RC CO2 Indoor Taylorcraft problems associated wing follows Modifications required piece construction 2 Wing Attachment 3 Covering 4 Weight one-piece construction easy since plans showed wing center sec tion dihedral formers separately constructed item fastened fuselage top center section merely glued thetwo wing halves form piece wing wing attached fuselage two 3/16 dowels two 8-32 plastic screws dowels screws holes can seen photo S plans show two large spars running length wingspan under side wing forward spar being inserted center section dihedral former plans also show half ribs tween main rib Both large spars half ribs deleted order make curved upper surface easier cover three 1/8 balsa spars used top wing surface can seen photo No 8 lower surface two 1/8 spars used instead large spars shown plans 3/16 X 3/8 spar used second inboard rib still used engage dihe dral former center section can seen photos No 9 10 con struction involving ailerons omitted wing tips W-l through W-4 copied 1/8 contest balsa used instead wood supplied kit main ribs modified spar changes also lighter stronger trailing-edge construction sketch shows 1/32 sheet balsa used accomplish 1/16 BALSA RIBS 1/32 BALSA BUILT-UP TRAILING EDGE tail made according plans except use 3/32 sq balsa stead 1/8 balsa R-l through R-5 E-l through E-8 made contest balsa Thread used hinges usual manner cotton swab sticks glued place elevator rudder horns Photos No II 12 show details RC installation inch styrofoam glued platform appropriate cut outs equipment As can seen photo Nos 5 13 pull-pull string used actuate control surfaces cross arms rear cabin cross arm pieces connected servos cotton swab-wood sticks Goldberg snapr keepers press fitted both ends sticks Short pieces 1/16 dia music wire tight fit servo fitting snapr keeper snapped onto wire switch mounted 1/16 balsa sheet photo No 6 The antenna wrapped time around styrofoam stuffed aft end fuselage Photo No 14 shows strings exiting fuselage controlling elevator entire plane covered water shrink tissue except silk used over curved stringers N-I N-4 nose using clear dope stick tissue framework No other dope applied tissuecontinued page 80 42 Model Aviation 9 Bottom View wing showing main spar terminating second inboard rib Two 1/8 spars extend base rib tip 7 Main bulkhead cutout engine-tank mod ule 1/16 plywood Balsa used required plywood doublers back engine cowl holes 12 Typical string hinges sewn figure 8 style per RC practice 10 Main sear fits between two 1/8 sq balsa pieces glued dihedral former per kit plans 8 Top view wing showing three 1/8 balsa spars Kit construction half ribs no spars upper surface 13 How servos connected wooden drive arms control cables 14 Empennage showing elevator control 11 Cotton swab stick rudder elevator wires entering fuselage through 1/16 balsa horns Scale-type control cables show clearly filler piece FULL-SIZE PLANS No 114Ernie Violetts D H Comet CL Scale 1974 Nats first-place winner twin flies beautifully No 115Nina An RC pattern job takes advantage best existing criteria No 116Electro-Lite Hal Covers contest-type free flight VTOsHytork electric motor No 117Novice simple beginners A-i Nordic constructed entirely sheet balsa No 118Gollygeewhiz Dan Rutherfords Half-A powered Combat job turns dime No 100Hinnants F-5$450 ultimate maneuverability smoothness 60 Pattern lob has No101Short Seamew $300 40-powered class carrier model good prototype lends itself innovations No102French Wench $225 Free Flight Classes 1/2A 049 051 fully tested design No 103Kloud King S400 15-19 RC Old-Timer Free Flight based upon 1938 record breaker FF No 104Wiley Post Biplane $225 Petite durable scale design either rubber tail wagger Ipulse rudderl No 105Harold Ruarks Sportsman $450 dream RC cabin iob pretty smooth lines 40 powered fullhouse No 106Vought Kingfisher $450 semi-scale fully stuntable Control Line model Las King IFor 25 35 enginesl $900 $400 $150 $150 $150 No 107Aeronca K$200 24 wingspan rubber Indoor Scale lob old-time lghtplane Its done 90 seconds No108Electric $375 Couldns done Dick Sarpolus Astro 25 RC lob performs pattern No 109Bill Fuoris Quarter Midget $300 Developed House Balsa design modifications faster times No 110The Zipper $175 latest CL Scale Racers John Kils donk lob must racing fans No111Max-A-Million $375 fleet free flights problem good A/B FAI No112Sneat $275 Sport RC glider simple lob can flown engine No113Cessna 150 Acrobat $275 Step up Half-A CL iobs 09-powered semi-profile easy build fly rnrnmmmmmmmm Circle numbers plans wish order 105 106107 112113 108 114115 100101 102103104 109110 111 116117118 P/ease print carefully Enclosed $ NAME STREET CITY STATE 710 Price includes hrst-class postage Send check money order payable Model Aviation AMA 806 Fifteenth St. NW. Washington DC 20005 MOVING T US KNOWI WHERE YOU ARE GOINGI COMPLETETHISWhen move please let us know advancesix weeks re CARD AND ATTACHquired change address Attach current MA mailing labelI MAILING LABELin space check appropriate box below mail toI Subscription Dept. Model Aviation 806 Fifteenth St. NW. RECENTWashington DC ~ate boxenclose CheckI IC CHANGE OF ADDRESS0 NEW SUBSCRIPTION Non-AMA subscription rates $1200 12 months Canada United States possessions elsewhere $1400 Membership AMA includes subscription see separate applica- tion issue NAME ADDRESS CITY/STATE71 P____________________ L MODEL AVIATION 806 FIFTEENTH ST. NW. WASHINGTON DC 20005 J RC CO2 Indoor Taylorcral continued page 42 final weights Wing 180 oz fuselage empennage control yokes strings styrofoam receiver battet holder288 oz batteryl9 oz Cat non Tini-Twin-322 oz Total weight w 1135 oz 385 oz per square ft Flying I no trouble balancing di plane since radio weighed tha plane slight shift radi resulted significant change CG k cation After several trial flights th help &f Bill Brown able tak plane off fly several times aroun Penn State Recreation Hall Gymn sium Bill change timing th engine obtain power wants try CO2 indoor RC shoul specify its use RC ordering hi engine considers during th building process known th little CO2 would pull plane off th ground results very gratifyin goal loop think b next year will done Several improvk ments already can made especially started over Hot Stuff glue would say weight time Bill has several ideas o extract power out CC charge no means ide propeller used Quality propellers dil ferent pitches easily available intends use large quantities CC should buy 5- 10-pound CO2 fir extinguisher buy adaptor Bi] Brown small CO sparklets would ge expensive Using modified engine 10 wood prop cut down 91/2 en gine turned over 2200 2400 rpm initial burst soon settled down F 1400 1500 rpm majority th flight plane landed under power ani could taxied back pit area usin rudder control ADVERTISERS INDEX ACe Radio Control Inc Andrews Aircraft Model Company7 AMA PR Cleveland Model & Supply Co Concept Models61 Du-Bro Products Inc Emerson Electric J T Finley Co Distributors Carl Goldberg Models Grish Brothers G-S Products Corp Intl jefs Friends K&S Engineering Peck-Polymers7 Satellite City71 Sig Mfg Company Sterling Models Inc Superscale71 TeleCraft7 VI Products7 Williams Brothers7 World Engines. 68 72 Back Cove 20/20 Graphics71 80 Model Aviation
Edition: Model Aviation - 1975/10
Page Numbers: 40, 41, 42, 80
Using Bill Browns twin cylinder engine modified Comet kit proves gratifying performer George Gurney 7414OWOCYLNOO BROWN JR / /1 pc*OOO It-RO P THE INCENTIVE attempting CO powered indoor RC came time State College RC Club Pa submitted Bill Browns name Hall Fame award Bill flying small airplanes CO2 engines years clubs annual Delta-Dart Centre Region Indoor Meet thought RC flight using latest model CO2 en gine might complement awards cere mony should nomination accepted Bill inducted AMA Hall Fame indoor RC CO powered flight made looking suitable plane members local Jr model ing club brought 54 Comet Taylorcraft meetings thought kit looked about right project Kdoor about undertake After looking few kits decided Taylorcraft about great wing area could find span kit selected Comet Taylorcraft No 3505 wing span 54 chord 8 wing area 432 sq 3 sq ft Since ability Brown Jr two cyl inder CO2 engine provide thrust fly airplane unknown further light wing loading necessary assure slow flying plane philosophy building obvious build light Based guess/estimated wing loading 3 4 oz/ft2 projected model weight 9 12 oz Certain weights already known easily determined twin-cylinder engine eight aluminum tanks copper tubing 912 prop firewall Taybroraft tank holder measured calcu lated weigh 175 oz advertised weight lightest RC two-channel sys tem Cannon Tini-Twin 225 Ma battery 460 oz totals 625 oz plane wasnt built yet Nevertheless kit bought work begun problem areas associated fuselage seemed I Modifications nose CO2 engine 2 Reinforcing landing gear take added weight RC gear en gine etc 3 Addition structure support RC gear battery switch 4 Accessibility RC equipment 5 Overall weight 40 Model Aviation George Gurney end 54 Taylorcraft occasion ex citing demonstration ambition loop What next surprising often kit modified various events Refilling capsules another flight Author suggests advising manufacturer order twin RCa slight modification made Radio Cannon Tini Twin R E Past experience RC airplanes pro vided answers Photo No shows engine assembly made unit facilitate ease removal also could bench tested being installed airplane firewall 1/16 plywood tank holder 1/2 X 1 1/8 X 2 5/16 common pine drilled out eight /2-diameter tanks Holes 9/16 centers fire wall fastened forward bulkhead three small screws shown photo No2 engine cowling carved solid block balsa hollowed out 1/16 1/8 wall except 8-32 plastic oval-head screws fasten cowl forward bulkhead Photo No 3 shows cowl covering engine landing gear made 1/16 plywood shaped shown photo No 4 axle 042 OD X 025 ID tubing epoxied plywood land ing gear glass-headed pin epoxied end tubing hold Trexler No 6 wheels wood hubs Trexler wheels drilled out faced off both sides 1/32 plywood glued hub ends sanded shape drilled accept axle sketch shows above modifications support landing gear fuselage 1/16 X 1/8 slot cut 3/8 sq balsa piece piece glued fuse lage sketch shows relationship gear balsa piece receiverbattery platform reinforces land ing gear assembly DRILLED OUT HUB RACED OFF 1/32 PLYWOOD BOTH ENDS GLUED TO HUB SAND B DRILL BOTH ENDS LANDING GEAR 1/16 PLYWOOD Since RC airplanes use detach able wing access radio through opening seemed reasonable plane Therefore opening formed over cabin area rein forced shown photo No 5 leading edge wing back end overhead windshield built fuselage seemed like good detachment point leading edge supported windshield struts fastened cowl front windshield Photo No6 shows struts build plane light yet strong always difficult reason de cided use 3/32 sq balsa main framework instead 1/8 sq called plans Much door details well rubber motor reinforcement rear fuselage omitted Fuselage bulkhead F-I should have made 1/16 plywood instead balsa shown photo No 7 F-2 F-3 instru ment panel F-4 copied 1/16 contest balsa used place wood provided kit Curved stringers nose N-I through N-4 also made using contest balsa four windshield braces extending leading edge wing cut through 1/32 sheet ed cowl glued underside cowl bulkhead F-3 other string ers / 16 X 1/8 installed according plans except wing opening terminated rear edge opening turn page October1975 41 1 MJ 140 Brown Jr C02 engine mounted firewall CO2 tanks fit snugly 1/2 diam eter holes 5 Wing dowels 8-32 tapped holes trailing edge hold-down screws 1/8 side ply doublers underside holes 4 Landing gear Trexler #6 wheels 012 music wire bracing wire Wheel axle epoxied plywood 2 Engine tank module fastened three 1/4 long screws forward bulkhead 6 Tiny Twin receiver-servo end 225ma battery Styrofoam cutout snug fit 1/16 sheet balsa cutout switch 3 Balsa cowling 9-1/2 Paulownis hard wood prop Isanded down 10 stock size RC CO2 Indoor Taylorcraft problems associated wing follows Modifications required piece construction 2 Wing Attachment 3 Covering 4 Weight one-piece construction easy since plans showed wing center sec tion dihedral formers separately constructed item fastened fuselage top center section merely glued thetwo wing halves form piece wing wing attached fuselage two 3/16 dowels two 8-32 plastic screws dowels screws holes can seen photo S plans show two large spars running length wingspan under side wing forward spar being inserted center section dihedral former plans also show half ribs tween main rib Both large spars half ribs deleted order make curved upper surface easier cover three 1/8 balsa spars used top wing surface can seen photo No 8 lower surface two 1/8 spars used instead large spars shown plans 3/16 X 3/8 spar used second inboard rib still used engage dihe dral former center section can seen photos No 9 10 con struction involving ailerons omitted wing tips W-l through W-4 copied 1/8 contest balsa used instead wood supplied kit main ribs modified spar changes also lighter stronger trailing-edge construction sketch shows 1/32 sheet balsa used accomplish 1/16 BALSA RIBS 1/32 BALSA BUILT-UP TRAILING EDGE tail made according plans except use 3/32 sq balsa stead 1/8 balsa R-l through R-5 E-l through E-8 made contest balsa Thread used hinges usual manner cotton swab sticks glued place elevator rudder horns Photos No II 12 show details RC installation inch styrofoam glued platform appropriate cut outs equipment As can seen photo Nos 5 13 pull-pull string used actuate control surfaces cross arms rear cabin cross arm pieces connected servos cotton swab-wood sticks Goldberg snapr keepers press fitted both ends sticks Short pieces 1/16 dia music wire tight fit servo fitting snapr keeper snapped onto wire switch mounted 1/16 balsa sheet photo No 6 The antenna wrapped time around styrofoam stuffed aft end fuselage Photo No 14 shows strings exiting fuselage controlling elevator entire plane covered water shrink tissue except silk used over curved stringers N-I N-4 nose using clear dope stick tissue framework No other dope applied tissuecontinued page 80 42 Model Aviation 9 Bottom View wing showing main spar terminating second inboard rib Two 1/8 spars extend base rib tip 7 Main bulkhead cutout engine-tank mod ule 1/16 plywood Balsa used required plywood doublers back engine cowl holes 12 Typical string hinges sewn figure 8 style per RC practice 10 Main sear fits between two 1/8 sq balsa pieces glued dihedral former per kit plans 8 Top view wing showing three 1/8 balsa spars Kit construction half ribs no spars upper surface 13 How servos connected wooden drive arms control cables 14 Empennage showing elevator control 11 Cotton swab stick rudder elevator wires entering fuselage through 1/16 balsa horns Scale-type control cables show clearly filler piece FULL-SIZE PLANS No 114Ernie Violetts D H Comet CL Scale 1974 Nats first-place winner twin flies beautifully No 115Nina An RC pattern job takes advantage best existing criteria No 116Electro-Lite Hal Covers contest-type free flight VTOsHytork electric motor No 117Novice simple beginners A-i Nordic constructed entirely sheet balsa No 118Gollygeewhiz Dan Rutherfords Half-A powered Combat job turns dime No 100Hinnants F-5$450 ultimate maneuverability smoothness 60 Pattern lob has No101Short Seamew $300 40-powered class carrier model good prototype lends itself innovations No102French Wench $225 Free Flight Classes 1/2A 049 051 fully tested design No 103Kloud King S400 15-19 RC Old-Timer Free Flight based upon 1938 record breaker FF No 104Wiley Post Biplane $225 Petite durable scale design either rubber tail wagger Ipulse rudderl No 105Harold Ruarks Sportsman $450 dream RC cabin iob pretty smooth lines 40 powered fullhouse No 106Vought Kingfisher $450 semi-scale fully stuntable Control Line model Las King IFor 25 35 enginesl $900 $400 $150 $150 $150 No 107Aeronca K$200 24 wingspan rubber Indoor Scale lob old-time lghtplane Its done 90 seconds No108Electric $375 Couldns done Dick Sarpolus Astro 25 RC lob performs pattern No 109Bill Fuoris Quarter Midget $300 Developed House Balsa design modifications faster times No 110The Zipper $175 latest CL Scale Racers John Kils donk lob must racing fans No111Max-A-Million $375 fleet free flights problem good A/B FAI No112Sneat $275 Sport RC glider simple lob can flown engine No113Cessna 150 Acrobat $275 Step up Half-A CL iobs 09-powered semi-profile easy build fly rnrnmmmmmmmm Circle numbers plans wish order 105 106107 112113 108 114115 100101 102103104 109110 111 116117118 P/ease print carefully Enclosed $ NAME STREET CITY STATE 710 Price includes hrst-class postage Send check money order payable Model Aviation AMA 806 Fifteenth St. NW. Washington DC 20005 MOVING T US KNOWI WHERE YOU ARE GOINGI COMPLETETHISWhen move please let us know advancesix weeks re CARD AND ATTACHquired change address Attach current MA mailing labelI MAILING LABELin space check appropriate box below mail toI Subscription Dept. Model Aviation 806 Fifteenth St. NW. RECENTWashington DC ~ate boxenclose CheckI IC CHANGE OF ADDRESS0 NEW SUBSCRIPTION Non-AMA subscription rates $1200 12 months Canada United States possessions elsewhere $1400 Membership AMA includes subscription see separate applica- tion issue NAME ADDRESS CITY/STATE71 P____________________ L MODEL AVIATION 806 FIFTEENTH ST. NW. WASHINGTON DC 20005 J RC CO2 Indoor Taylorcral continued page 42 final weights Wing 180 oz fuselage empennage control yokes strings styrofoam receiver battet holder288 oz batteryl9 oz Cat non Tini-Twin-322 oz Total weight w 1135 oz 385 oz per square ft Flying I no trouble balancing di plane since radio weighed tha plane slight shift radi resulted significant change CG k cation After several trial flights th help &f Bill Brown able tak plane off fly several times aroun Penn State Recreation Hall Gymn sium Bill change timing th engine obtain power wants try CO2 indoor RC shoul specify its use RC ordering hi engine considers during th building process known th little CO2 would pull plane off th ground results very gratifyin goal loop think b next year will done Several improvk ments already can made especially started over Hot Stuff glue would say weight time Bill has several ideas o extract power out CC charge no means ide propeller used Quality propellers dil ferent pitches easily available intends use large quantities CC should buy 5- 10-pound CO2 fir extinguisher buy adaptor Bi] Brown small CO sparklets would ge expensive Using modified engine 10 wood prop cut down 91/2 en gine turned over 2200 2400 rpm initial burst soon settled down F 1400 1500 rpm majority th flight plane landed under power ani could taxied back pit area usin rudder control ADVERTISERS INDEX ACe Radio Control Inc Andrews Aircraft Model Company7 AMA PR Cleveland Model & Supply Co Concept Models61 Du-Bro Products Inc Emerson Electric J T Finley Co Distributors Carl Goldberg Models Grish Brothers G-S Products Corp Intl jefs Friends K&S Engineering Peck-Polymers7 Satellite City71 Sig Mfg Company Sterling Models Inc Superscale71 TeleCraft7 VI Products7 Williams Brothers7 World Engines. 68 72 Back Cove 20/20 Graphics71 80 Model Aviation
Edition: Model Aviation - 1975/10
Page Numbers: 40, 41, 42, 80
Using Bill Browns twin cylinder engine modified Comet kit proves gratifying performer George Gurney 7414OWOCYLNOO BROWN JR / /1 pc*OOO It-RO P THE INCENTIVE attempting CO powered indoor RC came time State College RC Club Pa submitted Bill Browns name Hall Fame award Bill flying small airplanes CO2 engines years clubs annual Delta-Dart Centre Region Indoor Meet thought RC flight using latest model CO2 en gine might complement awards cere mony should nomination accepted Bill inducted AMA Hall Fame indoor RC CO powered flight made looking suitable plane members local Jr model ing club brought 54 Comet Taylorcraft meetings thought kit looked about right project Kdoor about undertake After looking few kits decided Taylorcraft about great wing area could find span kit selected Comet Taylorcraft No 3505 wing span 54 chord 8 wing area 432 sq 3 sq ft Since ability Brown Jr two cyl inder CO2 engine provide thrust fly airplane unknown further light wing loading necessary assure slow flying plane philosophy building obvious build light Based guess/estimated wing loading 3 4 oz/ft2 projected model weight 9 12 oz Certain weights already known easily determined twin-cylinder engine eight aluminum tanks copper tubing 912 prop firewall Taybroraft tank holder measured calcu lated weigh 175 oz advertised weight lightest RC two-channel sys tem Cannon Tini-Twin 225 Ma battery 460 oz totals 625 oz plane wasnt built yet Nevertheless kit bought work begun problem areas associated fuselage seemed I Modifications nose CO2 engine 2 Reinforcing landing gear take added weight RC gear en gine etc 3 Addition structure support RC gear battery switch 4 Accessibility RC equipment 5 Overall weight 40 Model Aviation George Gurney end 54 Taylorcraft occasion ex citing demonstration ambition loop What next surprising often kit modified various events Refilling capsules another flight Author suggests advising manufacturer order twin RCa slight modification made Radio Cannon Tini Twin R E Past experience RC airplanes pro vided answers Photo No shows engine assembly made unit facilitate ease removal also could bench tested being installed airplane firewall 1/16 plywood tank holder 1/2 X 1 1/8 X 2 5/16 common pine drilled out eight /2-diameter tanks Holes 9/16 centers fire wall fastened forward bulkhead three small screws shown photo No2 engine cowling carved solid block balsa hollowed out 1/16 1/8 wall except 8-32 plastic oval-head screws fasten cowl forward bulkhead Photo No 3 shows cowl covering engine landing gear made 1/16 plywood shaped shown photo No 4 axle 042 OD X 025 ID tubing epoxied plywood land ing gear glass-headed pin epoxied end tubing hold Trexler No 6 wheels wood hubs Trexler wheels drilled out faced off both sides 1/32 plywood glued hub ends sanded shape drilled accept axle sketch shows above modifications support landing gear fuselage 1/16 X 1/8 slot cut 3/8 sq balsa piece piece glued fuse lage sketch shows relationship gear balsa piece receiverbattery platform reinforces land ing gear assembly DRILLED OUT HUB RACED OFF 1/32 PLYWOOD BOTH ENDS GLUED TO HUB SAND B DRILL BOTH ENDS LANDING GEAR 1/16 PLYWOOD Since RC airplanes use detach able wing access radio through opening seemed reasonable plane Therefore opening formed over cabin area rein forced shown photo No 5 leading edge wing back end overhead windshield built fuselage seemed like good detachment point leading edge supported windshield struts fastened cowl front windshield Photo No6 shows struts build plane light yet strong always difficult reason de cided use 3/32 sq balsa main framework instead 1/8 sq called plans Much door details well rubber motor reinforcement rear fuselage omitted Fuselage bulkhead F-I should have made 1/16 plywood instead balsa shown photo No 7 F-2 F-3 instru ment panel F-4 copied 1/16 contest balsa used place wood provided kit Curved stringers nose N-I through N-4 also made using contest balsa four windshield braces extending leading edge wing cut through 1/32 sheet ed cowl glued underside cowl bulkhead F-3 other string ers / 16 X 1/8 installed according plans except wing opening terminated rear edge opening turn page October1975 41 1 MJ 140 Brown Jr C02 engine mounted firewall CO2 tanks fit snugly 1/2 diam eter holes 5 Wing dowels 8-32 tapped holes trailing edge hold-down screws 1/8 side ply doublers underside holes 4 Landing gear Trexler #6 wheels 012 music wire bracing wire Wheel axle epoxied plywood 2 Engine tank module fastened three 1/4 long screws forward bulkhead 6 Tiny Twin receiver-servo end 225ma battery Styrofoam cutout snug fit 1/16 sheet balsa cutout switch 3 Balsa cowling 9-1/2 Paulownis hard wood prop Isanded down 10 stock size RC CO2 Indoor Taylorcraft problems associated wing follows Modifications required piece construction 2 Wing Attachment 3 Covering 4 Weight one-piece construction easy since plans showed wing center sec tion dihedral formers separately constructed item fastened fuselage top center section merely glued thetwo wing halves form piece wing wing attached fuselage two 3/16 dowels two 8-32 plastic screws dowels screws holes can seen photo S plans show two large spars running length wingspan under side wing forward spar being inserted center section dihedral former plans also show half ribs tween main rib Both large spars half ribs deleted order make curved upper surface easier cover three 1/8 balsa spars used top wing surface can seen photo No 8 lower surface two 1/8 spars used instead large spars shown plans 3/16 X 3/8 spar used second inboard rib still used engage dihe dral former center section can seen photos No 9 10 con struction involving ailerons omitted wing tips W-l through W-4 copied 1/8 contest balsa used instead wood supplied kit main ribs modified spar changes also lighter stronger trailing-edge construction sketch shows 1/32 sheet balsa used accomplish 1/16 BALSA RIBS 1/32 BALSA BUILT-UP TRAILING EDGE tail made according plans except use 3/32 sq balsa stead 1/8 balsa R-l through R-5 E-l through E-8 made contest balsa Thread used hinges usual manner cotton swab sticks glued place elevator rudder horns Photos No II 12 show details RC installation inch styrofoam glued platform appropriate cut outs equipment As can seen photo Nos 5 13 pull-pull string used actuate control surfaces cross arms rear cabin cross arm pieces connected servos cotton swab-wood sticks Goldberg snapr keepers press fitted both ends sticks Short pieces 1/16 dia music wire tight fit servo fitting snapr keeper snapped onto wire switch mounted 1/16 balsa sheet photo No 6 The antenna wrapped time around styrofoam stuffed aft end fuselage Photo No 14 shows strings exiting fuselage controlling elevator entire plane covered water shrink tissue except silk used over curved stringers N-I N-4 nose using clear dope stick tissue framework No other dope applied tissuecontinued page 80 42 Model Aviation 9 Bottom View wing showing main spar terminating second inboard rib Two 1/8 spars extend base rib tip 7 Main bulkhead cutout engine-tank mod ule 1/16 plywood Balsa used required plywood doublers back engine cowl holes 12 Typical string hinges sewn figure 8 style per RC practice 10 Main sear fits between two 1/8 sq balsa pieces glued dihedral former per kit plans 8 Top view wing showing three 1/8 balsa spars Kit construction half ribs no spars upper surface 13 How servos connected wooden drive arms control cables 14 Empennage showing elevator control 11 Cotton swab stick rudder elevator wires entering fuselage through 1/16 balsa horns Scale-type control cables show clearly filler piece FULL-SIZE PLANS No 114Ernie Violetts D H Comet CL Scale 1974 Nats first-place winner twin flies beautifully No 115Nina An RC pattern job takes advantage best existing criteria No 116Electro-Lite Hal Covers contest-type free flight VTOsHytork electric motor No 117Novice simple beginners A-i Nordic constructed entirely sheet balsa No 118Gollygeewhiz Dan Rutherfords Half-A powered Combat job turns dime No 100Hinnants F-5$450 ultimate maneuverability smoothness 60 Pattern lob has No101Short Seamew $300 40-powered class carrier model good prototype lends itself innovations No102French Wench $225 Free Flight Classes 1/2A 049 051 fully tested design No 103Kloud King S400 15-19 RC Old-Timer Free Flight based upon 1938 record breaker FF No 104Wiley Post Biplane $225 Petite durable scale design either rubber tail wagger Ipulse rudderl No 105Harold Ruarks Sportsman $450 dream RC cabin iob pretty smooth lines 40 powered fullhouse No 106Vought Kingfisher $450 semi-scale fully stuntable Control Line model Las King IFor 25 35 enginesl $900 $400 $150 $150 $150 No 107Aeronca K$200 24 wingspan rubber Indoor Scale lob old-time lghtplane Its done 90 seconds No108Electric $375 Couldns done Dick Sarpolus Astro 25 RC lob performs pattern No 109Bill Fuoris Quarter Midget $300 Developed House Balsa design modifications faster times No 110The Zipper $175 latest CL Scale Racers John Kils donk lob must racing fans No111Max-A-Million $375 fleet free flights problem good A/B FAI No112Sneat $275 Sport RC glider simple lob can flown engine No113Cessna 150 Acrobat $275 Step up Half-A CL iobs 09-powered semi-profile easy build fly rnrnmmmmmmmm Circle numbers plans wish order 105 106107 112113 108 114115 100101 102103104 109110 111 116117118 P/ease print carefully Enclosed $ NAME STREET CITY STATE 710 Price includes hrst-class postage Send check money order payable Model Aviation AMA 806 Fifteenth St. NW. Washington DC 20005 MOVING T US KNOWI WHERE YOU ARE GOINGI COMPLETETHISWhen move please let us know advancesix weeks re CARD AND ATTACHquired change address Attach current MA mailing labelI MAILING LABELin space check appropriate box below mail toI Subscription Dept. Model Aviation 806 Fifteenth St. NW. RECENTWashington DC ~ate boxenclose CheckI IC CHANGE OF ADDRESS0 NEW SUBSCRIPTION Non-AMA subscription rates $1200 12 months Canada United States possessions elsewhere $1400 Membership AMA includes subscription see separate applica- tion issue NAME ADDRESS CITY/STATE71 P____________________ L MODEL AVIATION 806 FIFTEENTH ST. NW. WASHINGTON DC 20005 J RC CO2 Indoor Taylorcral continued page 42 final weights Wing 180 oz fuselage empennage control yokes strings styrofoam receiver battet holder288 oz batteryl9 oz Cat non Tini-Twin-322 oz Total weight w 1135 oz 385 oz per square ft Flying I no trouble balancing di plane since radio weighed tha plane slight shift radi resulted significant change CG k cation After several trial flights th help &f Bill Brown able tak plane off fly several times aroun Penn State Recreation Hall Gymn sium Bill change timing th engine obtain power wants try CO2 indoor RC shoul specify its use RC ordering hi engine considers during th building process known th little CO2 would pull plane off th ground results very gratifyin goal loop think b next year will done Several improvk ments already can made especially started over Hot Stuff glue would say weight time Bill has several ideas o extract power out CC charge no means ide propeller used Quality propellers dil ferent pitches easily available intends use large quantities CC should buy 5- 10-pound CO2 fir extinguisher buy adaptor Bi] Brown small CO sparklets would ge expensive Using modified engine 10 wood prop cut down 91/2 en gine turned over 2200 2400 rpm initial burst soon settled down F 1400 1500 rpm majority th flight plane landed under power ani could taxied back pit area usin rudder control ADVERTISERS INDEX ACe Radio Control Inc Andrews Aircraft Model Company7 AMA PR Cleveland Model & Supply Co Concept Models61 Du-Bro Products Inc Emerson Electric J T Finley Co Distributors Carl Goldberg Models Grish Brothers G-S Products Corp Intl jefs Friends K&S Engineering Peck-Polymers7 Satellite City71 Sig Mfg Company Sterling Models Inc Superscale71 TeleCraft7 VI Products7 Williams Brothers7 World Engines. 68 72 Back Cove 20/20 Graphics71 80 Model Aviation