HELICOPTERS Dave Chesney BIG Sorry about goes Uhli Baudrexel Germany regarding report February issue MA Mike Mas first world fly RC helicopter sustained inverted flight long after issue circulated informed first recorded demonstration sustained inverted flight took place Europe mid-summer 1979 Emie Huber also succeeded flying inverted well congratulations got three have pioneered inverted flight Now ofyou wanting try hand inverted flying Mike Mas sent along some back ground advice Ill pass along check out photos Looks easy right Well heres Mikes story first introduced RC helicopters December 1971 could think about day would go local flying field after unloading fueling starting heli copter would pull beauty rock solid hover nice 360 tail spin proceed flying around like fixed wing aircraft maybe few rolls loops grand finale land top car Little did know would take over year before would able hover within area foot ball field keep up tank-full fuel set goal No matter long takes Ill some day achieve ambitions make helicopter exactly what want As extension goal decided about 18 months ago first person world fly RC helicopter sustained inverted flight told impossible after months training testing finally flew helicopter inverted flight 54 seconds February 1979 time realized could done Thanks giving Day 1979 flew first public demonMike Mas proves possible fly RC helicopter sustained inverted flight stration inverted flight video tape made flew Schlueter Heliboy powered HP Gold Cup engine standard five channel Futaba radio Flying inverted aid transmitter reversing switches requires ability mentally reverse required inputs fore/aft cyclic tail rotor well throttle collec tive During months training actually hooked up control functions backwards time until able fly mentally rather just reflex youre fixed wing pilot may able simulate process hooking up flight control back wards trying fly AMA pattern crashing things happening heli copter inverted flight loss pendulum stability Pendulum stability can Continued page 99 rn boy high ,.rted pass doesnt convince Mike Mas really did nothing will June 1980 23 Shielding spark ignition Steve Auman Jena LA Process Engineer Beldon Corp maker automotive ignition wire suggests Beldon IRS ignition cable amethodof control ling radio frequency RF interference running spark ignition engine RC says wire has 10000 ohms resistance per foot shield suppress ignition noises auto radios should produce similar effect resistor high tension wire editor Bill Winter mentioned earlier Ive tried Im playing new transistorized ignition system TIS will report two months hence However anyone has experience type c able would please share experience us Im subject RE interference problems Fred Collins reminded developed shielded ignition system box featured Model Builders March 1974 issue rejected time beyond limited electronic knowledge however Fred advises needed components available Radio Shack stores minimal skills needed fabricate reader interested Freds system cannot obtain copy magazine article send large SASE copy schematic Fred says avoid metal pushrods throttle mount -watt resistor top ignition coil avoid breakage An article Charles Kenney February 1975 issue ModelAirplane News described similar shield ed ignition system utilizing rechargeable nicad battery Need mounting bracket Eli7 Yes such exotic accessories Morton M/5 Distri butor rotors fuel tank reproductions old time engines available Fred Collins 29 Stewart Avenue Pittsburgh PA 15227 Send SASE Fred list details Goodyear blimps beware Bill Effinger Berkeley Models interesting flights 1936 original Buccaneer Lakehurst NAS flew dirigible Los Angeles moored time fortunately ripped 30 feet its fabric next flight Buccaneer went cranberry bog went looking got lost tracked Out another Navy blimp About week later blimp located model Well least couldnt have too upset Bill recently retired Atlanta back modeling mood bunch interesting projects underway Could red white kit boxes coming back Dee B Mathews 506 S Walnut Greensburg KS 67054 * roam cure ana aaaa ukmna w * Machine cut selected balsa ply * * Attractive molded canopy * * 5132 dia preformed gear * * Complete hardware package * * Rolled full size p lan Isometrics * / Illustrated stepbystep Instructions * F-. An aircraft style grace beautiful V tailed machine designed Sunday sport flyer Du Bra Mixer controls tail surfaces performance outstanding Like sister-ship Executive structure mostly balsa 114 siding absorbs rigors active practice Youll like way parts fit Its good kit value real performer beautiful bird fly DEALER INQUIRIES INVITED kept stock Heliboy helicopters enough distance between rotor tail boom prevent tail boom strike Inverted flying can cause blades come close striking distance under some circum stances instance change positive pitch full negative pitch high blade rpm holding rear awash plate command could cause strike since blade will over bite Similarly strike might occur blade speed down hard rear awash plate command given since may suffici ent centrifugal force keep blades flexing boom Throttle collective throttle will have equipped either throttle hold throttle governor throttle hold set-up means 5th servo micro switch opens circuit throttle servo thereby locking servo throttle position desired approx Y open though collective changes can made assume micro switch actuated cam collective servo output arm DRC governor offers advantage nearconstant blade speeds collective pitch passes through zero degrees pitch An electronic governor developed few years ago Al Erwin also requires fifth servo Tach-Tron may still available chose throttle hold set-up fly inverted Heliboy youll need approximately 16 degrees total collective pitch travel half stick transmitter should have zero degrees pitch Movement stick forward should give approximately 8 degrees positive pitch movement stick full back should give approximately 8 degrees negative must modify pitch change wire rebending limited plastic follower Helicopters other Heliboy may need similar modifications general inverted flying requires increasing total collective pitch required plus addition fifth servo Tail rotor mixer tail rotor mixer modification may beneficial sinceideally tail rotor mix should give compensation whether main rotor pitch changing positive pitch nega tive pitch dont use tail rotor compensator ships because dont fly spring-centered stick like pilots anyway Theres really no center trim position flying helicopter aware instant collective pitch passes through negative back through positive pitch tail rotor must attended order compensate torque changes Remember now torque both positive negative settings since engine deliver ing power blades Transmitter reversing switches have used transmitter reversing switches inverted flying Continued page 23 explained example broom being suspended its handle attempting support broom upright its handle balanc ing broom hand Unlike suspended broom strong inputs required displace broom its vertical position supported broom requires strong inputs return broom vertical position further vertical power required return helicopter tendency fuselage return its natural position suspended beneath rotor just pendulum broom will return its vertical position am still doing lot testing because have answered questions about inverted flight can done few tips follow Helicopter markings problems inverted flight retraining yourself observe helicopter different manner usual vtsual clues no longer apply usually watch skids rotor disc flying inverted rotor disc seems disappear skid usually sight Youll have acquire new approach looking machine especially inverted turns steep banking left hand turn appears steep right hand turn Nose up maneuvers such stall turns will also upset judgement since again visual clues misleading photographs show mark rngs use reinforce other visual references machine inverted Fuel tank engine adjustment fuel tank must modified inverted flight otherwise youll pouring fuel over flying field Im using dual-vented tank center pick up Youll need install vent top other bottom Both vents must fitted stiff length fuel tubing bottom vents top tank vice versa fuel pick-up done normal manner sure install filter complete tank modification fill halfway invert tank should no binding pick-up tube Remember cant land adjust needle youre inverted Another important point needle valve adjustment ship inverted entire tank higher needle valve causing engine run very rich inverted Care must used adjusting needle valve want engine slightly leaner used running does mean lean means nor rich Perhaps Robart Automix pumper would valuable DRC Coning angle main rotor coning angle June 1980 99 RC Helicopters/Chesney IwIEtxE z9ruui 4I1 0- S0S0gS can greatly simplified electronically revers ing flight controls instant helicopter achieves inverted position believe feature would cut down pilot errors training time 90% Some transmitters cannot modified reversing switches have feature already installed need have switches mounted externally gang controls can reversed quickly Still throttle control servo must modified noted either throttle hold installation Tach-Tron Remember trim positions critical reversing switches installed instance trim say right tail rotor upright flip switch youll have left tail rotor trims should done helicopter trans mitter article tried outline briefly what takes fly inverted give some general settings will get air desire fly inverted forsee near future helicopter radios reversing feature builtin helicopter kits inverted set-up instruc tions enclosed skys limit Dont give up ship Youll probably see hear about inverted flight RC choppers other beginners already know inverted flight comes just before inverted landing Boy thats rough rotor blades next month its back basics Dave Chesney Rt 9 Box 621A Greensboro NC 27409 IWhen writing advertisers mention reed about Model Aviation RC Giant Scale/Beckman Continued page 24 drawings published Model Builder junked what started over model now based Westburg drawings addi tional pictures info NASM original target date finishing August 1979 still looked makeable spring 79 designed built landing gear converted Homelite 16 cu engine obtained learned cut spruce started build fuselage point decided should taking some pictures dug out 30 year old Argus C3 shot some black white pictures shop took film photographer friend processing started giving advice taking pictures led getting interested making good pictures led SLR cameras lenses lights tripods meters etc etc led wanting process own pictures led present Jekyl Hyde basement sometimes model shop sometimes darkroom between its photo studio somewhere along line found myself doing articles Model Aviation After have excuse forI mean help pay forall gear didnt turn led doing column what about Sparrowhawk guessed Im almost year behind schedule losing ground rapidly Im still making some progress Jam going finish original Curtiss F9C first flew February 12 1931 Maybe should shoot Golden Anniversary First Flight model Plans Bob Morse Several Giant Scale plans Bob Morse available Accounting Clerical Services Santa Clara CA mentioned Cessna 180 plans last month com ments appear below addition Ive chance review Bobs Berliner-Joyce P-16 P-16 particular interest cause its gulled wing roots similar Curtiss Sparrowhawk As might expect Bob have come up completely different solutions same problem Bobs wing panels fit Onto wire pins much like current sailplane practice wires two wing pass through anchored fuselage Because gull wings wires require some fancy bending no difficult bending up landing gear first glance either sets plans might seem little overwhelming two sheets 40 wide seven eight ft long addition some big structural drawings lot detailed information packed doesnt take long things start making sense however once youve taken time look over properly thing found disappointing about both plans something applies big bird plan Ive seen far materials used basically old standbys balsa plywood some spruce used good ad vantage nothing really new Its really plan developers fault expect sell plansthey cant afford go too far out techniques unfamiliar potential customers Heres area innovative planbuilder can try new things example balsa wing ribs two big birds could replaced much less expensive foam-core board Bobs use traditional materials master ful has lot comment about big birds cant just blown up versions smaller models full scale building 102 Model Aviation flOdO WARE WORKING TURNBUCKLES RIGGING & CONTROL CABLE eCONTROL HORNS e STRUT FITTINGS SHOCK CORD COCKPIT TRIM PULLEYS e INSTRUMENT HOUSINGS information catalogue en d $1 00 IlQctovENT CORP PO BOX 9641 SAN DIEGOCA32109
Edition: Model Aviation - 1980/06
Page Numbers: 23, 99, 102
HELICOPTERS Dave Chesney BIG Sorry about goes Uhli Baudrexel Germany regarding report February issue MA Mike Mas first world fly RC helicopter sustained inverted flight long after issue circulated informed first recorded demonstration sustained inverted flight took place Europe mid-summer 1979 Emie Huber also succeeded flying inverted well congratulations got three have pioneered inverted flight Now ofyou wanting try hand inverted flying Mike Mas sent along some back ground advice Ill pass along check out photos Looks easy right Well heres Mikes story first introduced RC helicopters December 1971 could think about day would go local flying field after unloading fueling starting heli copter would pull beauty rock solid hover nice 360 tail spin proceed flying around like fixed wing aircraft maybe few rolls loops grand finale land top car Little did know would take over year before would able hover within area foot ball field keep up tank-full fuel set goal No matter long takes Ill some day achieve ambitions make helicopter exactly what want As extension goal decided about 18 months ago first person world fly RC helicopter sustained inverted flight told impossible after months training testing finally flew helicopter inverted flight 54 seconds February 1979 time realized could done Thanks giving Day 1979 flew first public demonMike Mas proves possible fly RC helicopter sustained inverted flight stration inverted flight video tape made flew Schlueter Heliboy powered HP Gold Cup engine standard five channel Futaba radio Flying inverted aid transmitter reversing switches requires ability mentally reverse required inputs fore/aft cyclic tail rotor well throttle collec tive During months training actually hooked up control functions backwards time until able fly mentally rather just reflex youre fixed wing pilot may able simulate process hooking up flight control back wards trying fly AMA pattern crashing things happening heli copter inverted flight loss pendulum stability Pendulum stability can Continued page 99 rn boy high ,.rted pass doesnt convince Mike Mas really did nothing will June 1980 23 Shielding spark ignition Steve Auman Jena LA Process Engineer Beldon Corp maker automotive ignition wire suggests Beldon IRS ignition cable amethodof control ling radio frequency RF interference running spark ignition engine RC says wire has 10000 ohms resistance per foot shield suppress ignition noises auto radios should produce similar effect resistor high tension wire editor Bill Winter mentioned earlier Ive tried Im playing new transistorized ignition system TIS will report two months hence However anyone has experience type c able would please share experience us Im subject RE interference problems Fred Collins reminded developed shielded ignition system box featured Model Builders March 1974 issue rejected time beyond limited electronic knowledge however Fred advises needed components available Radio Shack stores minimal skills needed fabricate reader interested Freds system cannot obtain copy magazine article send large SASE copy schematic Fred says avoid metal pushrods throttle mount -watt resistor top ignition coil avoid breakage An article Charles Kenney February 1975 issue ModelAirplane News described similar shield ed ignition system utilizing rechargeable nicad battery Need mounting bracket Eli7 Yes such exotic accessories Morton M/5 Distri butor rotors fuel tank reproductions old time engines available Fred Collins 29 Stewart Avenue Pittsburgh PA 15227 Send SASE Fred list details Goodyear blimps beware Bill Effinger Berkeley Models interesting flights 1936 original Buccaneer Lakehurst NAS flew dirigible Los Angeles moored time fortunately ripped 30 feet its fabric next flight Buccaneer went cranberry bog went looking got lost tracked Out another Navy blimp About week later blimp located model Well least couldnt have too upset Bill recently retired Atlanta back modeling mood bunch interesting projects underway Could red white kit boxes coming back Dee B Mathews 506 S Walnut Greensburg KS 67054 * roam cure ana aaaa ukmna w * Machine cut selected balsa ply * * Attractive molded canopy * * 5132 dia preformed gear * * Complete hardware package * * Rolled full size p lan Isometrics * / Illustrated stepbystep Instructions * F-. An aircraft style grace beautiful V tailed machine designed Sunday sport flyer Du Bra Mixer controls tail surfaces performance outstanding Like sister-ship Executive structure mostly balsa 114 siding absorbs rigors active practice Youll like way parts fit Its good kit value real performer beautiful bird fly DEALER INQUIRIES INVITED kept stock Heliboy helicopters enough distance between rotor tail boom prevent tail boom strike Inverted flying can cause blades come close striking distance under some circum stances instance change positive pitch full negative pitch high blade rpm holding rear awash plate command could cause strike since blade will over bite Similarly strike might occur blade speed down hard rear awash plate command given since may suffici ent centrifugal force keep blades flexing boom Throttle collective throttle will have equipped either throttle hold throttle governor throttle hold set-up means 5th servo micro switch opens circuit throttle servo thereby locking servo throttle position desired approx Y open though collective changes can made assume micro switch actuated cam collective servo output arm DRC governor offers advantage nearconstant blade speeds collective pitch passes through zero degrees pitch An electronic governor developed few years ago Al Erwin also requires fifth servo Tach-Tron may still available chose throttle hold set-up fly inverted Heliboy youll need approximately 16 degrees total collective pitch travel half stick transmitter should have zero degrees pitch Movement stick forward should give approximately 8 degrees positive pitch movement stick full back should give approximately 8 degrees negative must modify pitch change wire rebending limited plastic follower Helicopters other Heliboy may need similar modifications general inverted flying requires increasing total collective pitch required plus addition fifth servo Tail rotor mixer tail rotor mixer modification may beneficial sinceideally tail rotor mix should give compensation whether main rotor pitch changing positive pitch nega tive pitch dont use tail rotor compensator ships because dont fly spring-centered stick like pilots anyway Theres really no center trim position flying helicopter aware instant collective pitch passes through negative back through positive pitch tail rotor must attended order compensate torque changes Remember now torque both positive negative settings since engine deliver ing power blades Transmitter reversing switches have used transmitter reversing switches inverted flying Continued page 23 explained example broom being suspended its handle attempting support broom upright its handle balanc ing broom hand Unlike suspended broom strong inputs required displace broom its vertical position supported broom requires strong inputs return broom vertical position further vertical power required return helicopter tendency fuselage return its natural position suspended beneath rotor just pendulum broom will return its vertical position am still doing lot testing because have answered questions about inverted flight can done few tips follow Helicopter markings problems inverted flight retraining yourself observe helicopter different manner usual vtsual clues no longer apply usually watch skids rotor disc flying inverted rotor disc seems disappear skid usually sight Youll have acquire new approach looking machine especially inverted turns steep banking left hand turn appears steep right hand turn Nose up maneuvers such stall turns will also upset judgement since again visual clues misleading photographs show mark rngs use reinforce other visual references machine inverted Fuel tank engine adjustment fuel tank must modified inverted flight otherwise youll pouring fuel over flying field Im using dual-vented tank center pick up Youll need install vent top other bottom Both vents must fitted stiff length fuel tubing bottom vents top tank vice versa fuel pick-up done normal manner sure install filter complete tank modification fill halfway invert tank should no binding pick-up tube Remember cant land adjust needle youre inverted Another important point needle valve adjustment ship inverted entire tank higher needle valve causing engine run very rich inverted Care must used adjusting needle valve want engine slightly leaner used running does mean lean means nor rich Perhaps Robart Automix pumper would valuable DRC Coning angle main rotor coning angle June 1980 99 RC Helicopters/Chesney IwIEtxE z9ruui 4I1 0- S0S0gS can greatly simplified electronically revers ing flight controls instant helicopter achieves inverted position believe feature would cut down pilot errors training time 90% Some transmitters cannot modified reversing switches have feature already installed need have switches mounted externally gang controls can reversed quickly Still throttle control servo must modified noted either throttle hold installation Tach-Tron Remember trim positions critical reversing switches installed instance trim say right tail rotor upright flip switch youll have left tail rotor trims should done helicopter trans mitter article tried outline briefly what takes fly inverted give some general settings will get air desire fly inverted forsee near future helicopter radios reversing feature builtin helicopter kits inverted set-up instruc tions enclosed skys limit Dont give up ship Youll probably see hear about inverted flight RC choppers other beginners already know inverted flight comes just before inverted landing Boy thats rough rotor blades next month its back basics Dave Chesney Rt 9 Box 621A Greensboro NC 27409 IWhen writing advertisers mention reed about Model Aviation RC Giant Scale/Beckman Continued page 24 drawings published Model Builder junked what started over model now based Westburg drawings addi tional pictures info NASM original target date finishing August 1979 still looked makeable spring 79 designed built landing gear converted Homelite 16 cu engine obtained learned cut spruce started build fuselage point decided should taking some pictures dug out 30 year old Argus C3 shot some black white pictures shop took film photographer friend processing started giving advice taking pictures led getting interested making good pictures led SLR cameras lenses lights tripods meters etc etc led wanting process own pictures led present Jekyl Hyde basement sometimes model shop sometimes darkroom between its photo studio somewhere along line found myself doing articles Model Aviation After have excuse forI mean help pay forall gear didnt turn led doing column what about Sparrowhawk guessed Im almost year behind schedule losing ground rapidly Im still making some progress Jam going finish original Curtiss F9C first flew February 12 1931 Maybe should shoot Golden Anniversary First Flight model Plans Bob Morse Several Giant Scale plans Bob Morse available Accounting Clerical Services Santa Clara CA mentioned Cessna 180 plans last month com ments appear below addition Ive chance review Bobs Berliner-Joyce P-16 P-16 particular interest cause its gulled wing roots similar Curtiss Sparrowhawk As might expect Bob have come up completely different solutions same problem Bobs wing panels fit Onto wire pins much like current sailplane practice wires two wing pass through anchored fuselage Because gull wings wires require some fancy bending no difficult bending up landing gear first glance either sets plans might seem little overwhelming two sheets 40 wide seven eight ft long addition some big structural drawings lot detailed information packed doesnt take long things start making sense however once youve taken time look over properly thing found disappointing about both plans something applies big bird plan Ive seen far materials used basically old standbys balsa plywood some spruce used good ad vantage nothing really new Its really plan developers fault expect sell plansthey cant afford go too far out techniques unfamiliar potential customers Heres area innovative planbuilder can try new things example balsa wing ribs two big birds could replaced much less expensive foam-core board Bobs use traditional materials master ful has lot comment about big birds cant just blown up versions smaller models full scale building 102 Model Aviation flOdO WARE WORKING TURNBUCKLES RIGGING & CONTROL CABLE eCONTROL HORNS e STRUT FITTINGS SHOCK CORD COCKPIT TRIM PULLEYS e INSTRUMENT HOUSINGS information catalogue en d $1 00 IlQctovENT CORP PO BOX 9641 SAN DIEGOCA32109
Edition: Model Aviation - 1980/06
Page Numbers: 23, 99, 102
HELICOPTERS Dave Chesney BIG Sorry about goes Uhli Baudrexel Germany regarding report February issue MA Mike Mas first world fly RC helicopter sustained inverted flight long after issue circulated informed first recorded demonstration sustained inverted flight took place Europe mid-summer 1979 Emie Huber also succeeded flying inverted well congratulations got three have pioneered inverted flight Now ofyou wanting try hand inverted flying Mike Mas sent along some back ground advice Ill pass along check out photos Looks easy right Well heres Mikes story first introduced RC helicopters December 1971 could think about day would go local flying field after unloading fueling starting heli copter would pull beauty rock solid hover nice 360 tail spin proceed flying around like fixed wing aircraft maybe few rolls loops grand finale land top car Little did know would take over year before would able hover within area foot ball field keep up tank-full fuel set goal No matter long takes Ill some day achieve ambitions make helicopter exactly what want As extension goal decided about 18 months ago first person world fly RC helicopter sustained inverted flight told impossible after months training testing finally flew helicopter inverted flight 54 seconds February 1979 time realized could done Thanks giving Day 1979 flew first public demonMike Mas proves possible fly RC helicopter sustained inverted flight stration inverted flight video tape made flew Schlueter Heliboy powered HP Gold Cup engine standard five channel Futaba radio Flying inverted aid transmitter reversing switches requires ability mentally reverse required inputs fore/aft cyclic tail rotor well throttle collec tive During months training actually hooked up control functions backwards time until able fly mentally rather just reflex youre fixed wing pilot may able simulate process hooking up flight control back wards trying fly AMA pattern crashing things happening heli copter inverted flight loss pendulum stability Pendulum stability can Continued page 99 rn boy high ,.rted pass doesnt convince Mike Mas really did nothing will June 1980 23 Shielding spark ignition Steve Auman Jena LA Process Engineer Beldon Corp maker automotive ignition wire suggests Beldon IRS ignition cable amethodof control ling radio frequency RF interference running spark ignition engine RC says wire has 10000 ohms resistance per foot shield suppress ignition noises auto radios should produce similar effect resistor high tension wire editor Bill Winter mentioned earlier Ive tried Im playing new transistorized ignition system TIS will report two months hence However anyone has experience type c able would please share experience us Im subject RE interference problems Fred Collins reminded developed shielded ignition system box featured Model Builders March 1974 issue rejected time beyond limited electronic knowledge however Fred advises needed components available Radio Shack stores minimal skills needed fabricate reader interested Freds system cannot obtain copy magazine article send large SASE copy schematic Fred says avoid metal pushrods throttle mount -watt resistor top ignition coil avoid breakage An article Charles Kenney February 1975 issue ModelAirplane News described similar shield ed ignition system utilizing rechargeable nicad battery Need mounting bracket Eli7 Yes such exotic accessories Morton M/5 Distri butor rotors fuel tank reproductions old time engines available Fred Collins 29 Stewart Avenue Pittsburgh PA 15227 Send SASE Fred list details Goodyear blimps beware Bill Effinger Berkeley Models interesting flights 1936 original Buccaneer Lakehurst NAS flew dirigible Los Angeles moored time fortunately ripped 30 feet its fabric next flight Buccaneer went cranberry bog went looking got lost tracked Out another Navy blimp About week later blimp located model Well least couldnt have too upset Bill recently retired Atlanta back modeling mood bunch interesting projects underway Could red white kit boxes coming back Dee B Mathews 506 S Walnut Greensburg KS 67054 * roam cure ana aaaa ukmna w * Machine cut selected balsa ply * * Attractive molded canopy * * 5132 dia preformed gear * * Complete hardware package * * Rolled full size p lan Isometrics * / Illustrated stepbystep Instructions * F-. An aircraft style grace beautiful V tailed machine designed Sunday sport flyer Du Bra Mixer controls tail surfaces performance outstanding Like sister-ship Executive structure mostly balsa 114 siding absorbs rigors active practice Youll like way parts fit Its good kit value real performer beautiful bird fly DEALER INQUIRIES INVITED kept stock Heliboy helicopters enough distance between rotor tail boom prevent tail boom strike Inverted flying can cause blades come close striking distance under some circum stances instance change positive pitch full negative pitch high blade rpm holding rear awash plate command could cause strike since blade will over bite Similarly strike might occur blade speed down hard rear awash plate command given since may suffici ent centrifugal force keep blades flexing boom Throttle collective throttle will have equipped either throttle hold throttle governor throttle hold set-up means 5th servo micro switch opens circuit throttle servo thereby locking servo throttle position desired approx Y open though collective changes can made assume micro switch actuated cam collective servo output arm DRC governor offers advantage nearconstant blade speeds collective pitch passes through zero degrees pitch An electronic governor developed few years ago Al Erwin also requires fifth servo Tach-Tron may still available chose throttle hold set-up fly inverted Heliboy youll need approximately 16 degrees total collective pitch travel half stick transmitter should have zero degrees pitch Movement stick forward should give approximately 8 degrees positive pitch movement stick full back should give approximately 8 degrees negative must modify pitch change wire rebending limited plastic follower Helicopters other Heliboy may need similar modifications general inverted flying requires increasing total collective pitch required plus addition fifth servo Tail rotor mixer tail rotor mixer modification may beneficial sinceideally tail rotor mix should give compensation whether main rotor pitch changing positive pitch nega tive pitch dont use tail rotor compensator ships because dont fly spring-centered stick like pilots anyway Theres really no center trim position flying helicopter aware instant collective pitch passes through negative back through positive pitch tail rotor must attended order compensate torque changes Remember now torque both positive negative settings since engine deliver ing power blades Transmitter reversing switches have used transmitter reversing switches inverted flying Continued page 23 explained example broom being suspended its handle attempting support broom upright its handle balanc ing broom hand Unlike suspended broom strong inputs required displace broom its vertical position supported broom requires strong inputs return broom vertical position further vertical power required return helicopter tendency fuselage return its natural position suspended beneath rotor just pendulum broom will return its vertical position am still doing lot testing because have answered questions about inverted flight can done few tips follow Helicopter markings problems inverted flight retraining yourself observe helicopter different manner usual vtsual clues no longer apply usually watch skids rotor disc flying inverted rotor disc seems disappear skid usually sight Youll have acquire new approach looking machine especially inverted turns steep banking left hand turn appears steep right hand turn Nose up maneuvers such stall turns will also upset judgement since again visual clues misleading photographs show mark rngs use reinforce other visual references machine inverted Fuel tank engine adjustment fuel tank must modified inverted flight otherwise youll pouring fuel over flying field Im using dual-vented tank center pick up Youll need install vent top other bottom Both vents must fitted stiff length fuel tubing bottom vents top tank vice versa fuel pick-up done normal manner sure install filter complete tank modification fill halfway invert tank should no binding pick-up tube Remember cant land adjust needle youre inverted Another important point needle valve adjustment ship inverted entire tank higher needle valve causing engine run very rich inverted Care must used adjusting needle valve want engine slightly leaner used running does mean lean means nor rich Perhaps Robart Automix pumper would valuable DRC Coning angle main rotor coning angle June 1980 99 RC Helicopters/Chesney IwIEtxE z9ruui 4I1 0- S0S0gS can greatly simplified electronically revers ing flight controls instant helicopter achieves inverted position believe feature would cut down pilot errors training time 90% Some transmitters cannot modified reversing switches have feature already installed need have switches mounted externally gang controls can reversed quickly Still throttle control servo must modified noted either throttle hold installation Tach-Tron Remember trim positions critical reversing switches installed instance trim say right tail rotor upright flip switch youll have left tail rotor trims should done helicopter trans mitter article tried outline briefly what takes fly inverted give some general settings will get air desire fly inverted forsee near future helicopter radios reversing feature builtin helicopter kits inverted set-up instruc tions enclosed skys limit Dont give up ship Youll probably see hear about inverted flight RC choppers other beginners already know inverted flight comes just before inverted landing Boy thats rough rotor blades next month its back basics Dave Chesney Rt 9 Box 621A Greensboro NC 27409 IWhen writing advertisers mention reed about Model Aviation RC Giant Scale/Beckman Continued page 24 drawings published Model Builder junked what started over model now based Westburg drawings addi tional pictures info NASM original target date finishing August 1979 still looked makeable spring 79 designed built landing gear converted Homelite 16 cu engine obtained learned cut spruce started build fuselage point decided should taking some pictures dug out 30 year old Argus C3 shot some black white pictures shop took film photographer friend processing started giving advice taking pictures led getting interested making good pictures led SLR cameras lenses lights tripods meters etc etc led wanting process own pictures led present Jekyl Hyde basement sometimes model shop sometimes darkroom between its photo studio somewhere along line found myself doing articles Model Aviation After have excuse forI mean help pay forall gear didnt turn led doing column what about Sparrowhawk guessed Im almost year behind schedule losing ground rapidly Im still making some progress Jam going finish original Curtiss F9C first flew February 12 1931 Maybe should shoot Golden Anniversary First Flight model Plans Bob Morse Several Giant Scale plans Bob Morse available Accounting Clerical Services Santa Clara CA mentioned Cessna 180 plans last month com ments appear below addition Ive chance review Bobs Berliner-Joyce P-16 P-16 particular interest cause its gulled wing roots similar Curtiss Sparrowhawk As might expect Bob have come up completely different solutions same problem Bobs wing panels fit Onto wire pins much like current sailplane practice wires two wing pass through anchored fuselage Because gull wings wires require some fancy bending no difficult bending up landing gear first glance either sets plans might seem little overwhelming two sheets 40 wide seven eight ft long addition some big structural drawings lot detailed information packed doesnt take long things start making sense however once youve taken time look over properly thing found disappointing about both plans something applies big bird plan Ive seen far materials used basically old standbys balsa plywood some spruce used good ad vantage nothing really new Its really plan developers fault expect sell plansthey cant afford go too far out techniques unfamiliar potential customers Heres area innovative planbuilder can try new things example balsa wing ribs two big birds could replaced much less expensive foam-core board Bobs use traditional materials master ful has lot comment about big birds cant just blown up versions smaller models full scale building 102 Model Aviation flOdO WARE WORKING TURNBUCKLES RIGGING & CONTROL CABLE eCONTROL HORNS e STRUT FITTINGS SHOCK CORD COCKPIT TRIM PULLEYS e INSTRUMENT HOUSINGS information catalogue en d $1 00 IlQctovENT CORP PO BOX 9641 SAN DIEGOCA32109