SettinganRC *4hiC U Hubert E Bitner Jr COURSE LAYOUT UPWIND FINISHUPWIND 200 METERS—I START --/K _ _ / ENTRY N/ /I ENTRY CORRIDOR~CORRIDOR \50 METER//5OMETER // 7yWDPILOT DOWNWINDHIGH 6OMETERDOWNWIND START \ LOW2O METERALTITUDEFINISH ALTITUDE / POLE APPROX 10HIGH 4 / TIMERS 0 REFERENCE INT APPROX 200 /iALLTIMESWERE EXITAND ENTRYRELAYED TO MASTER LINES FORISCREEN ALTITUDE JUDGE ROPES WERE USED FOR L-i REFERENCE LINES yPOLE Il / I/BY USING TWO POLES AND U10SOME ROPE THE ALT JUDGE UCOULD VISUALLY CHECK THE ALTITUDE JUDGE STATEDLBOUNDARIES OFTHE COURSE WHETHER OR NOT FLIGHT WAS OFFICIALHIS HEAD RESTED ON FIXED PLATFORM speed 343 mph may sound like much flying through traps ends 200-meter course fulfilling requirements proved considerable challenge BACK IN October 1976 attended meeting Manned Spacecraft Center Radio Control Club am mem ber meeting Lars Giertz announced would radio-controlled air craft speed trials held Ellington Air Force Base 17th month said no official speed record set helicopter date attention Without further encouragement made very effort trials After setting record lot easier breaking least thats what thought until got early Sun day morning am going good sport tell break lightning record 343 mph dont mean just show up fly probably will take some important facts brought attention will cover ar ticle such modifications ma chine course lay-out limitations equipment flying techniques tim ing procedure last least prepare dossier Having very little time get ready speed trials prevented build ing new machine proceeded some minor modifications scratchbuilt helicopter few major areas changes can create increased speed First rotor rpm very im portant Revolution Helibaby have very high rpm rotor blade reasons fast in36 Model Aviation oper Speed Record 9 0 THE RECRUITER FAI CLASS F3C Piston Engine Helicopter / / ItLW 80 cm / / 220cm / ~280cm 2 50cm Metric Man Motor Disk Area Main Rotor Blade Area No Blades Tail Rotor Disk Area Horizontal Stabilizer Area Total Wt 38 kg Loading Per Unit Main Rotor Disk Area Engine Enya45RC 7496cc Speed Ratio Engine 101 Main Rotor Speed Ratio Main Rotor 14 Tail Rotor Fuel Tank Capacity English 1153008 sq cm 1699 sq 3355 sq cm525 sq 2 61544 sqcm 9498 sq 308 sq cm 481 sq 838 lb 329 gm/sq cm 69 lbIsq ft 3125cc 457 cu 101 14 105 oz crease rpm try decreasing pitch until copter lifts off just over 3/4 throttle practical procedure everyday flying getting speed will work Also rotor head has lots teetering little no resistance springs rubber will help hold speed pitching up nose Cans good maneuverability produce too much drag speed lot nose weight will counteract helicopters tendency flatten nose-up forward flight horizontal stabilizer down elevator will also help achieving speed again holding nose down discovered course 200 meters length 100-meter entry corridor top visually checked out decided going easy task after thought racing full throttle full forward cyclic turned out attempt get end course other piece add prob lem 30-degree wind blowing about 20 knots gusting up about 25 knots course set up north south have fly both directions have completed flight because downwind upwind times calculated give average speed Fortunately John Burkam has proposing new set rules would cut course 200 meters 200 feet would about right proportion considering airplane speeds versus helicopter speeds point would like make airplane can build up enough speed dive pretty much hold speed whole length 200-meter course heli copter cannot 200-foot course would also help aspect course must accurately measured checked directing official some limitations involved setting speed record cant fly copter truck car other vehicle sure check range radio machine flying must true helicopter ex plained FAI rules must weigh over 5 kg roughly 11 lbs also have Continued page 94 February 1978 37 MODEL SPECIFICATIONS nc, s . d machine After initial concept racing through traps full forward cyclic led attempt get end course other piece forced special set-upsnot good everyday flyingfor unique task see local hobby dealer WI~E almost Stahl design40 years ago t~p tTA OGA 4 lOBts famous 24 1/2 WWdGSPAN 0% FOR PACKING AND POSTAGE VA NESIDENTS ADD 4% TAX RUBBER & CO2 WINNER AT THE 50th NATS Blot 221/2 WINGSPMI $695 Kioud King Ambivalent Dennyplane Miss Arpiem Brigadeer articles skeleton photo 85% Power house photo accompanying months column Depending model size four spruce spars ranging located approximately 30% 70% chord perpendicular other Fulldepth plywood dihedral joiners placed slotting ribs hacksaw stacks appropriate thickness epoxied flush spars Shear webs 1/16 balsa added grain running vertical alternating front rear spars picture illustrates front spars should always webbed rear set may also webbed model stunted weight factor Additional strength can gained D tube sheeting leading edge ever seems add spanwise strength torsional rigidity has stated times bears repeating wing will no stronger rigid after covered heat-shrink material uncovered wing seems flexible uncovered absolutely should covered shiny stuff full set shear webs still doesnt cure flexibility get out silk pre pared pick up pieces Consider four-spar shear-web tech nique next old-timer Dr D B Mathews 506 South Walnut Greens burg KS 67054 Foam/Evans/Lester continued page 35 will take care problem mean time core isnt too bad ways salvage will discussed next issue Sectioning hot-wire method cut ting has limitation cuts must straight line Wings taper angle either LE TE must cut sections glued together Follow same procedure *108 Spo&te 28 WING8PAN S6 INE MODELS 2820 DORR AVE FAIRFAX VA 22030 Send free brochure section described cutting wing panel tip template inboard section also root template outboard section additional section requires additional template tip section also necessary cut very long wings sections due limitations tension necessary keep wire straight power uniform heating wire Dihedral Angle Cutting sim plest ways cutting dihedral angle two-piece wing raise tip prescribed height height can calcu lated angle given make vertical cut root panel can best done after cutting core core still blank can done before sheeting end-cutting jig after sheeting saw and/or sanding block endcutting jig can also done dihedral-angle cutting template angle-cutting tem plate can attached foam blank nails pressed foam can attached cutting jig see Fig 6 template angle half com plement total desired angle both sections must cut match cross sections joint example tendegree angle required template gle will 900 100/2 850 Regardless method should done systematically avoid cutting angle wrong end wrong direction two-panel wings right left sure top up cut root panel except gull wings cut angle outboard section polyhedral wing sure top up cut outer end tip inboard section root outboard section except gull wings same principles apply core cut complete right left panel sectioned polyhedral angle continued Prop Mod/Aycock continued page 31 exact eyeball part just make sure line both blades same OK now have big black line front prop will become high point wood work begins Select rather rough flat wood rasp starting high point work towards leading edge rasp being careful cut away leading edge just take down rather sharp leading edge satisfied same thing again high point towards trailing edge worrying about curved rounded surface just make flat per drawing B Repeat other blade Round off high point shown drawing tips will get quite thin will no way subtract props efficiency should have pile wood dust front now will make some Using 80-grit again hand sand blades rather smooth finish See said hard maple props work best have done respectable job put prop balancing tool should ball park After little practice will able get right money fact time will balanced closer came out box Finish sand blades 280 wet dry dry course done Notice did take anything off back prop blades Thus did alter basic pitch just added airfoil front finished prop should have quite sharp leading trailing edges Leave raw wood finish nothing please Try procedure prop size now using check engine performance airplane flying have found often can go high er pitch prop engine would lug before will turn now author ity Experiment various sizes pitches until get satisfies air remember prop rework can prove itself air ground tach have questions regard ing prop rework please feel free drop line care magazine will happy answer questions Helicopter/B itner continued page 37 altitude 20-60 meters stay within fly course start finish procedures must checked directing official Timing flight can done several ways will tell what method used four timers located south end four north end 94 Model Aviation course positioned line perpendicular start finish course Between line sight course ends vertical pole used reference point As model passed point would acti vate stopwatches times electronically relayed back master screen manned directing official numbers hit screen would vocal ly report cassette recorder avoid confusion error After flight finished times trans ferred recorder paper along information concerning whether run official order speed run accepted timing cannot 2/100 second difference end course watches two timers other words timers chance hitting within range times con verted speed Now will explain what official means speed run First improve communications used citizen-band radios converse point point points being course itself master screen timers also altitude judge As copter flew course altitude judge informed directing official whether altitude between 20 60 meters model enters course correctly stays boundaries course will stated official prepared repeat flight over over because will increase chance good flight get chance go record prepared obtain lot signatures comes time fill out paperwork just about everything requires paper Photographs three-view drawing model will also needed complete dossier will also asked ex plain course measured altutude checked method timing used will require some technical data concerning helicopter such weight overall size rotor blade area disc area power used tail-blade span mechanical ratios fuel capacity must admit lot work involved record over again would Believe will know three times about machine afterwards did before no excuse person break record Just dont break too badly because Im going give another shot someday want acknowledge Manned Spacecraft Center Radio Control Club organizing speed trial because couldnt have done writing advertisers mention read about MA Eliminator/Newton/Wade continued page 40 root tip achieved Use small steel scale marked hundredths inch 01 check alignment tip 1/16 negative root should 1/16 positive alignment correct tighten bolts re-check alignment bake required time After glue baked has cooled trailing edge filed smooth straight Control Units Although Mono-line unit shown plans will go detail its construction because parts readily available have built similar control unit before can find parts numbers plans two-line system can substituted very successfully Mono-line control unit fact reasons originally designing building Eliminator TIso could fly two lines still competitive Mono-line Final Assembly Notes Set up everything glass plate measure before final assembly ensure perfect alignment thrust line Some tooth picks might helpful aligning spar stab Drill some 1/16 holes outboard side February 1 978 95
Edition: Model Aviation - 1978/02
Page Numbers: 36, 37, 94, 95
SettinganRC *4hiC U Hubert E Bitner Jr COURSE LAYOUT UPWIND FINISHUPWIND 200 METERS—I START --/K _ _ / ENTRY N/ /I ENTRY CORRIDOR~CORRIDOR \50 METER//5OMETER // 7yWDPILOT DOWNWINDHIGH 6OMETERDOWNWIND START \ LOW2O METERALTITUDEFINISH ALTITUDE / POLE APPROX 10HIGH 4 / TIMERS 0 REFERENCE INT APPROX 200 /iALLTIMESWERE EXITAND ENTRYRELAYED TO MASTER LINES FORISCREEN ALTITUDE JUDGE ROPES WERE USED FOR L-i REFERENCE LINES yPOLE Il / I/BY USING TWO POLES AND U10SOME ROPE THE ALT JUDGE UCOULD VISUALLY CHECK THE ALTITUDE JUDGE STATEDLBOUNDARIES OFTHE COURSE WHETHER OR NOT FLIGHT WAS OFFICIALHIS HEAD RESTED ON FIXED PLATFORM speed 343 mph may sound like much flying through traps ends 200-meter course fulfilling requirements proved considerable challenge BACK IN October 1976 attended meeting Manned Spacecraft Center Radio Control Club am mem ber meeting Lars Giertz announced would radio-controlled air craft speed trials held Ellington Air Force Base 17th month said no official speed record set helicopter date attention Without further encouragement made very effort trials After setting record lot easier breaking least thats what thought until got early Sun day morning am going good sport tell break lightning record 343 mph dont mean just show up fly probably will take some important facts brought attention will cover ar ticle such modifications ma chine course lay-out limitations equipment flying techniques tim ing procedure last least prepare dossier Having very little time get ready speed trials prevented build ing new machine proceeded some minor modifications scratchbuilt helicopter few major areas changes can create increased speed First rotor rpm very im portant Revolution Helibaby have very high rpm rotor blade reasons fast in36 Model Aviation oper Speed Record 9 0 THE RECRUITER FAI CLASS F3C Piston Engine Helicopter / / ItLW 80 cm / / 220cm / ~280cm 2 50cm Metric Man Motor Disk Area Main Rotor Blade Area No Blades Tail Rotor Disk Area Horizontal Stabilizer Area Total Wt 38 kg Loading Per Unit Main Rotor Disk Area Engine Enya45RC 7496cc Speed Ratio Engine 101 Main Rotor Speed Ratio Main Rotor 14 Tail Rotor Fuel Tank Capacity English 1153008 sq cm 1699 sq 3355 sq cm525 sq 2 61544 sqcm 9498 sq 308 sq cm 481 sq 838 lb 329 gm/sq cm 69 lbIsq ft 3125cc 457 cu 101 14 105 oz crease rpm try decreasing pitch until copter lifts off just over 3/4 throttle practical procedure everyday flying getting speed will work Also rotor head has lots teetering little no resistance springs rubber will help hold speed pitching up nose Cans good maneuverability produce too much drag speed lot nose weight will counteract helicopters tendency flatten nose-up forward flight horizontal stabilizer down elevator will also help achieving speed again holding nose down discovered course 200 meters length 100-meter entry corridor top visually checked out decided going easy task after thought racing full throttle full forward cyclic turned out attempt get end course other piece add prob lem 30-degree wind blowing about 20 knots gusting up about 25 knots course set up north south have fly both directions have completed flight because downwind upwind times calculated give average speed Fortunately John Burkam has proposing new set rules would cut course 200 meters 200 feet would about right proportion considering airplane speeds versus helicopter speeds point would like make airplane can build up enough speed dive pretty much hold speed whole length 200-meter course heli copter cannot 200-foot course would also help aspect course must accurately measured checked directing official some limitations involved setting speed record cant fly copter truck car other vehicle sure check range radio machine flying must true helicopter ex plained FAI rules must weigh over 5 kg roughly 11 lbs also have Continued page 94 February 1978 37 MODEL SPECIFICATIONS nc, s . d machine After initial concept racing through traps full forward cyclic led attempt get end course other piece forced special set-upsnot good everyday flyingfor unique task see local hobby dealer WI~E almost Stahl design40 years ago t~p tTA OGA 4 lOBts famous 24 1/2 WWdGSPAN 0% FOR PACKING AND POSTAGE VA NESIDENTS ADD 4% TAX RUBBER & CO2 WINNER AT THE 50th NATS Blot 221/2 WINGSPMI $695 Kioud King Ambivalent Dennyplane Miss Arpiem Brigadeer articles skeleton photo 85% Power house photo accompanying months column Depending model size four spruce spars ranging located approximately 30% 70% chord perpendicular other Fulldepth plywood dihedral joiners placed slotting ribs hacksaw stacks appropriate thickness epoxied flush spars Shear webs 1/16 balsa added grain running vertical alternating front rear spars picture illustrates front spars should always webbed rear set may also webbed model stunted weight factor Additional strength can gained D tube sheeting leading edge ever seems add spanwise strength torsional rigidity has stated times bears repeating wing will no stronger rigid after covered heat-shrink material uncovered wing seems flexible uncovered absolutely should covered shiny stuff full set shear webs still doesnt cure flexibility get out silk pre pared pick up pieces Consider four-spar shear-web tech nique next old-timer Dr D B Mathews 506 South Walnut Greens burg KS 67054 Foam/Evans/Lester continued page 35 will take care problem mean time core isnt too bad ways salvage will discussed next issue Sectioning hot-wire method cut ting has limitation cuts must straight line Wings taper angle either LE TE must cut sections glued together Follow same procedure *108 Spo&te 28 WING8PAN S6 INE MODELS 2820 DORR AVE FAIRFAX VA 22030 Send free brochure section described cutting wing panel tip template inboard section also root template outboard section additional section requires additional template tip section also necessary cut very long wings sections due limitations tension necessary keep wire straight power uniform heating wire Dihedral Angle Cutting sim plest ways cutting dihedral angle two-piece wing raise tip prescribed height height can calcu lated angle given make vertical cut root panel can best done after cutting core core still blank can done before sheeting end-cutting jig after sheeting saw and/or sanding block endcutting jig can also done dihedral-angle cutting template angle-cutting tem plate can attached foam blank nails pressed foam can attached cutting jig see Fig 6 template angle half com plement total desired angle both sections must cut match cross sections joint example tendegree angle required template gle will 900 100/2 850 Regardless method should done systematically avoid cutting angle wrong end wrong direction two-panel wings right left sure top up cut root panel except gull wings cut angle outboard section polyhedral wing sure top up cut outer end tip inboard section root outboard section except gull wings same principles apply core cut complete right left panel sectioned polyhedral angle continued Prop Mod/Aycock continued page 31 exact eyeball part just make sure line both blades same OK now have big black line front prop will become high point wood work begins Select rather rough flat wood rasp starting high point work towards leading edge rasp being careful cut away leading edge just take down rather sharp leading edge satisfied same thing again high point towards trailing edge worrying about curved rounded surface just make flat per drawing B Repeat other blade Round off high point shown drawing tips will get quite thin will no way subtract props efficiency should have pile wood dust front now will make some Using 80-grit again hand sand blades rather smooth finish See said hard maple props work best have done respectable job put prop balancing tool should ball park After little practice will able get right money fact time will balanced closer came out box Finish sand blades 280 wet dry dry course done Notice did take anything off back prop blades Thus did alter basic pitch just added airfoil front finished prop should have quite sharp leading trailing edges Leave raw wood finish nothing please Try procedure prop size now using check engine performance airplane flying have found often can go high er pitch prop engine would lug before will turn now author ity Experiment various sizes pitches until get satisfies air remember prop rework can prove itself air ground tach have questions regard ing prop rework please feel free drop line care magazine will happy answer questions Helicopter/B itner continued page 37 altitude 20-60 meters stay within fly course start finish procedures must checked directing official Timing flight can done several ways will tell what method used four timers located south end four north end 94 Model Aviation course positioned line perpendicular start finish course Between line sight course ends vertical pole used reference point As model passed point would acti vate stopwatches times electronically relayed back master screen manned directing official numbers hit screen would vocal ly report cassette recorder avoid confusion error After flight finished times trans ferred recorder paper along information concerning whether run official order speed run accepted timing cannot 2/100 second difference end course watches two timers other words timers chance hitting within range times con verted speed Now will explain what official means speed run First improve communications used citizen-band radios converse point point points being course itself master screen timers also altitude judge As copter flew course altitude judge informed directing official whether altitude between 20 60 meters model enters course correctly stays boundaries course will stated official prepared repeat flight over over because will increase chance good flight get chance go record prepared obtain lot signatures comes time fill out paperwork just about everything requires paper Photographs three-view drawing model will also needed complete dossier will also asked ex plain course measured altutude checked method timing used will require some technical data concerning helicopter such weight overall size rotor blade area disc area power used tail-blade span mechanical ratios fuel capacity must admit lot work involved record over again would Believe will know three times about machine afterwards did before no excuse person break record Just dont break too badly because Im going give another shot someday want acknowledge Manned Spacecraft Center Radio Control Club organizing speed trial because couldnt have done writing advertisers mention read about MA Eliminator/Newton/Wade continued page 40 root tip achieved Use small steel scale marked hundredths inch 01 check alignment tip 1/16 negative root should 1/16 positive alignment correct tighten bolts re-check alignment bake required time After glue baked has cooled trailing edge filed smooth straight Control Units Although Mono-line unit shown plans will go detail its construction because parts readily available have built similar control unit before can find parts numbers plans two-line system can substituted very successfully Mono-line control unit fact reasons originally designing building Eliminator TIso could fly two lines still competitive Mono-line Final Assembly Notes Set up everything glass plate measure before final assembly ensure perfect alignment thrust line Some tooth picks might helpful aligning spar stab Drill some 1/16 holes outboard side February 1 978 95
Edition: Model Aviation - 1978/02
Page Numbers: 36, 37, 94, 95
SettinganRC *4hiC U Hubert E Bitner Jr COURSE LAYOUT UPWIND FINISHUPWIND 200 METERS—I START --/K _ _ / ENTRY N/ /I ENTRY CORRIDOR~CORRIDOR \50 METER//5OMETER // 7yWDPILOT DOWNWINDHIGH 6OMETERDOWNWIND START \ LOW2O METERALTITUDEFINISH ALTITUDE / POLE APPROX 10HIGH 4 / TIMERS 0 REFERENCE INT APPROX 200 /iALLTIMESWERE EXITAND ENTRYRELAYED TO MASTER LINES FORISCREEN ALTITUDE JUDGE ROPES WERE USED FOR L-i REFERENCE LINES yPOLE Il / I/BY USING TWO POLES AND U10SOME ROPE THE ALT JUDGE UCOULD VISUALLY CHECK THE ALTITUDE JUDGE STATEDLBOUNDARIES OFTHE COURSE WHETHER OR NOT FLIGHT WAS OFFICIALHIS HEAD RESTED ON FIXED PLATFORM speed 343 mph may sound like much flying through traps ends 200-meter course fulfilling requirements proved considerable challenge BACK IN October 1976 attended meeting Manned Spacecraft Center Radio Control Club am mem ber meeting Lars Giertz announced would radio-controlled air craft speed trials held Ellington Air Force Base 17th month said no official speed record set helicopter date attention Without further encouragement made very effort trials After setting record lot easier breaking least thats what thought until got early Sun day morning am going good sport tell break lightning record 343 mph dont mean just show up fly probably will take some important facts brought attention will cover ar ticle such modifications ma chine course lay-out limitations equipment flying techniques tim ing procedure last least prepare dossier Having very little time get ready speed trials prevented build ing new machine proceeded some minor modifications scratchbuilt helicopter few major areas changes can create increased speed First rotor rpm very im portant Revolution Helibaby have very high rpm rotor blade reasons fast in36 Model Aviation oper Speed Record 9 0 THE RECRUITER FAI CLASS F3C Piston Engine Helicopter / / ItLW 80 cm / / 220cm / ~280cm 2 50cm Metric Man Motor Disk Area Main Rotor Blade Area No Blades Tail Rotor Disk Area Horizontal Stabilizer Area Total Wt 38 kg Loading Per Unit Main Rotor Disk Area Engine Enya45RC 7496cc Speed Ratio Engine 101 Main Rotor Speed Ratio Main Rotor 14 Tail Rotor Fuel Tank Capacity English 1153008 sq cm 1699 sq 3355 sq cm525 sq 2 61544 sqcm 9498 sq 308 sq cm 481 sq 838 lb 329 gm/sq cm 69 lbIsq ft 3125cc 457 cu 101 14 105 oz crease rpm try decreasing pitch until copter lifts off just over 3/4 throttle practical procedure everyday flying getting speed will work Also rotor head has lots teetering little no resistance springs rubber will help hold speed pitching up nose Cans good maneuverability produce too much drag speed lot nose weight will counteract helicopters tendency flatten nose-up forward flight horizontal stabilizer down elevator will also help achieving speed again holding nose down discovered course 200 meters length 100-meter entry corridor top visually checked out decided going easy task after thought racing full throttle full forward cyclic turned out attempt get end course other piece add prob lem 30-degree wind blowing about 20 knots gusting up about 25 knots course set up north south have fly both directions have completed flight because downwind upwind times calculated give average speed Fortunately John Burkam has proposing new set rules would cut course 200 meters 200 feet would about right proportion considering airplane speeds versus helicopter speeds point would like make airplane can build up enough speed dive pretty much hold speed whole length 200-meter course heli copter cannot 200-foot course would also help aspect course must accurately measured checked directing official some limitations involved setting speed record cant fly copter truck car other vehicle sure check range radio machine flying must true helicopter ex plained FAI rules must weigh over 5 kg roughly 11 lbs also have Continued page 94 February 1978 37 MODEL SPECIFICATIONS nc, s . d machine After initial concept racing through traps full forward cyclic led attempt get end course other piece forced special set-upsnot good everyday flyingfor unique task see local hobby dealer WI~E almost Stahl design40 years ago t~p tTA OGA 4 lOBts famous 24 1/2 WWdGSPAN 0% FOR PACKING AND POSTAGE VA NESIDENTS ADD 4% TAX RUBBER & CO2 WINNER AT THE 50th NATS Blot 221/2 WINGSPMI $695 Kioud King Ambivalent Dennyplane Miss Arpiem Brigadeer articles skeleton photo 85% Power house photo accompanying months column Depending model size four spruce spars ranging located approximately 30% 70% chord perpendicular other Fulldepth plywood dihedral joiners placed slotting ribs hacksaw stacks appropriate thickness epoxied flush spars Shear webs 1/16 balsa added grain running vertical alternating front rear spars picture illustrates front spars should always webbed rear set may also webbed model stunted weight factor Additional strength can gained D tube sheeting leading edge ever seems add spanwise strength torsional rigidity has stated times bears repeating wing will no stronger rigid after covered heat-shrink material uncovered wing seems flexible uncovered absolutely should covered shiny stuff full set shear webs still doesnt cure flexibility get out silk pre pared pick up pieces Consider four-spar shear-web tech nique next old-timer Dr D B Mathews 506 South Walnut Greens burg KS 67054 Foam/Evans/Lester continued page 35 will take care problem mean time core isnt too bad ways salvage will discussed next issue Sectioning hot-wire method cut ting has limitation cuts must straight line Wings taper angle either LE TE must cut sections glued together Follow same procedure *108 Spo&te 28 WING8PAN S6 INE MODELS 2820 DORR AVE FAIRFAX VA 22030 Send free brochure section described cutting wing panel tip template inboard section also root template outboard section additional section requires additional template tip section also necessary cut very long wings sections due limitations tension necessary keep wire straight power uniform heating wire Dihedral Angle Cutting sim plest ways cutting dihedral angle two-piece wing raise tip prescribed height height can calcu lated angle given make vertical cut root panel can best done after cutting core core still blank can done before sheeting end-cutting jig after sheeting saw and/or sanding block endcutting jig can also done dihedral-angle cutting template angle-cutting tem plate can attached foam blank nails pressed foam can attached cutting jig see Fig 6 template angle half com plement total desired angle both sections must cut match cross sections joint example tendegree angle required template gle will 900 100/2 850 Regardless method should done systematically avoid cutting angle wrong end wrong direction two-panel wings right left sure top up cut root panel except gull wings cut angle outboard section polyhedral wing sure top up cut outer end tip inboard section root outboard section except gull wings same principles apply core cut complete right left panel sectioned polyhedral angle continued Prop Mod/Aycock continued page 31 exact eyeball part just make sure line both blades same OK now have big black line front prop will become high point wood work begins Select rather rough flat wood rasp starting high point work towards leading edge rasp being careful cut away leading edge just take down rather sharp leading edge satisfied same thing again high point towards trailing edge worrying about curved rounded surface just make flat per drawing B Repeat other blade Round off high point shown drawing tips will get quite thin will no way subtract props efficiency should have pile wood dust front now will make some Using 80-grit again hand sand blades rather smooth finish See said hard maple props work best have done respectable job put prop balancing tool should ball park After little practice will able get right money fact time will balanced closer came out box Finish sand blades 280 wet dry dry course done Notice did take anything off back prop blades Thus did alter basic pitch just added airfoil front finished prop should have quite sharp leading trailing edges Leave raw wood finish nothing please Try procedure prop size now using check engine performance airplane flying have found often can go high er pitch prop engine would lug before will turn now author ity Experiment various sizes pitches until get satisfies air remember prop rework can prove itself air ground tach have questions regard ing prop rework please feel free drop line care magazine will happy answer questions Helicopter/B itner continued page 37 altitude 20-60 meters stay within fly course start finish procedures must checked directing official Timing flight can done several ways will tell what method used four timers located south end four north end 94 Model Aviation course positioned line perpendicular start finish course Between line sight course ends vertical pole used reference point As model passed point would acti vate stopwatches times electronically relayed back master screen manned directing official numbers hit screen would vocal ly report cassette recorder avoid confusion error After flight finished times trans ferred recorder paper along information concerning whether run official order speed run accepted timing cannot 2/100 second difference end course watches two timers other words timers chance hitting within range times con verted speed Now will explain what official means speed run First improve communications used citizen-band radios converse point point points being course itself master screen timers also altitude judge As copter flew course altitude judge informed directing official whether altitude between 20 60 meters model enters course correctly stays boundaries course will stated official prepared repeat flight over over because will increase chance good flight get chance go record prepared obtain lot signatures comes time fill out paperwork just about everything requires paper Photographs three-view drawing model will also needed complete dossier will also asked ex plain course measured altutude checked method timing used will require some technical data concerning helicopter such weight overall size rotor blade area disc area power used tail-blade span mechanical ratios fuel capacity must admit lot work involved record over again would Believe will know three times about machine afterwards did before no excuse person break record Just dont break too badly because Im going give another shot someday want acknowledge Manned Spacecraft Center Radio Control Club organizing speed trial because couldnt have done writing advertisers mention read about MA Eliminator/Newton/Wade continued page 40 root tip achieved Use small steel scale marked hundredths inch 01 check alignment tip 1/16 negative root should 1/16 positive alignment correct tighten bolts re-check alignment bake required time After glue baked has cooled trailing edge filed smooth straight Control Units Although Mono-line unit shown plans will go detail its construction because parts readily available have built similar control unit before can find parts numbers plans two-line system can substituted very successfully Mono-line control unit fact reasons originally designing building Eliminator TIso could fly two lines still competitive Mono-line Final Assembly Notes Set up everything glass plate measure before final assembly ensure perfect alignment thrust line Some tooth picks might helpful aligning spar stab Drill some 1/16 holes outboard side February 1 978 95
Edition: Model Aviation - 1978/02
Page Numbers: 36, 37, 94, 95
SettinganRC *4hiC U Hubert E Bitner Jr COURSE LAYOUT UPWIND FINISHUPWIND 200 METERS—I START --/K _ _ / ENTRY N/ /I ENTRY CORRIDOR~CORRIDOR \50 METER//5OMETER // 7yWDPILOT DOWNWINDHIGH 6OMETERDOWNWIND START \ LOW2O METERALTITUDEFINISH ALTITUDE / POLE APPROX 10HIGH 4 / TIMERS 0 REFERENCE INT APPROX 200 /iALLTIMESWERE EXITAND ENTRYRELAYED TO MASTER LINES FORISCREEN ALTITUDE JUDGE ROPES WERE USED FOR L-i REFERENCE LINES yPOLE Il / I/BY USING TWO POLES AND U10SOME ROPE THE ALT JUDGE UCOULD VISUALLY CHECK THE ALTITUDE JUDGE STATEDLBOUNDARIES OFTHE COURSE WHETHER OR NOT FLIGHT WAS OFFICIALHIS HEAD RESTED ON FIXED PLATFORM speed 343 mph may sound like much flying through traps ends 200-meter course fulfilling requirements proved considerable challenge BACK IN October 1976 attended meeting Manned Spacecraft Center Radio Control Club am mem ber meeting Lars Giertz announced would radio-controlled air craft speed trials held Ellington Air Force Base 17th month said no official speed record set helicopter date attention Without further encouragement made very effort trials After setting record lot easier breaking least thats what thought until got early Sun day morning am going good sport tell break lightning record 343 mph dont mean just show up fly probably will take some important facts brought attention will cover ar ticle such modifications ma chine course lay-out limitations equipment flying techniques tim ing procedure last least prepare dossier Having very little time get ready speed trials prevented build ing new machine proceeded some minor modifications scratchbuilt helicopter few major areas changes can create increased speed First rotor rpm very im portant Revolution Helibaby have very high rpm rotor blade reasons fast in36 Model Aviation oper Speed Record 9 0 THE RECRUITER FAI CLASS F3C Piston Engine Helicopter / / ItLW 80 cm / / 220cm / ~280cm 2 50cm Metric Man Motor Disk Area Main Rotor Blade Area No Blades Tail Rotor Disk Area Horizontal Stabilizer Area Total Wt 38 kg Loading Per Unit Main Rotor Disk Area Engine Enya45RC 7496cc Speed Ratio Engine 101 Main Rotor Speed Ratio Main Rotor 14 Tail Rotor Fuel Tank Capacity English 1153008 sq cm 1699 sq 3355 sq cm525 sq 2 61544 sqcm 9498 sq 308 sq cm 481 sq 838 lb 329 gm/sq cm 69 lbIsq ft 3125cc 457 cu 101 14 105 oz crease rpm try decreasing pitch until copter lifts off just over 3/4 throttle practical procedure everyday flying getting speed will work Also rotor head has lots teetering little no resistance springs rubber will help hold speed pitching up nose Cans good maneuverability produce too much drag speed lot nose weight will counteract helicopters tendency flatten nose-up forward flight horizontal stabilizer down elevator will also help achieving speed again holding nose down discovered course 200 meters length 100-meter entry corridor top visually checked out decided going easy task after thought racing full throttle full forward cyclic turned out attempt get end course other piece add prob lem 30-degree wind blowing about 20 knots gusting up about 25 knots course set up north south have fly both directions have completed flight because downwind upwind times calculated give average speed Fortunately John Burkam has proposing new set rules would cut course 200 meters 200 feet would about right proportion considering airplane speeds versus helicopter speeds point would like make airplane can build up enough speed dive pretty much hold speed whole length 200-meter course heli copter cannot 200-foot course would also help aspect course must accurately measured checked directing official some limitations involved setting speed record cant fly copter truck car other vehicle sure check range radio machine flying must true helicopter ex plained FAI rules must weigh over 5 kg roughly 11 lbs also have Continued page 94 February 1978 37 MODEL SPECIFICATIONS nc, s . d machine After initial concept racing through traps full forward cyclic led attempt get end course other piece forced special set-upsnot good everyday flyingfor unique task see local hobby dealer WI~E almost Stahl design40 years ago t~p tTA OGA 4 lOBts famous 24 1/2 WWdGSPAN 0% FOR PACKING AND POSTAGE VA NESIDENTS ADD 4% TAX RUBBER & CO2 WINNER AT THE 50th NATS Blot 221/2 WINGSPMI $695 Kioud King Ambivalent Dennyplane Miss Arpiem Brigadeer articles skeleton photo 85% Power house photo accompanying months column Depending model size four spruce spars ranging located approximately 30% 70% chord perpendicular other Fulldepth plywood dihedral joiners placed slotting ribs hacksaw stacks appropriate thickness epoxied flush spars Shear webs 1/16 balsa added grain running vertical alternating front rear spars picture illustrates front spars should always webbed rear set may also webbed model stunted weight factor Additional strength can gained D tube sheeting leading edge ever seems add spanwise strength torsional rigidity has stated times bears repeating wing will no stronger rigid after covered heat-shrink material uncovered wing seems flexible uncovered absolutely should covered shiny stuff full set shear webs still doesnt cure flexibility get out silk pre pared pick up pieces Consider four-spar shear-web tech nique next old-timer Dr D B Mathews 506 South Walnut Greens burg KS 67054 Foam/Evans/Lester continued page 35 will take care problem mean time core isnt too bad ways salvage will discussed next issue Sectioning hot-wire method cut ting has limitation cuts must straight line Wings taper angle either LE TE must cut sections glued together Follow same procedure *108 Spo&te 28 WING8PAN S6 INE MODELS 2820 DORR AVE FAIRFAX VA 22030 Send free brochure section described cutting wing panel tip template inboard section also root template outboard section additional section requires additional template tip section also necessary cut very long wings sections due limitations tension necessary keep wire straight power uniform heating wire Dihedral Angle Cutting sim plest ways cutting dihedral angle two-piece wing raise tip prescribed height height can calcu lated angle given make vertical cut root panel can best done after cutting core core still blank can done before sheeting end-cutting jig after sheeting saw and/or sanding block endcutting jig can also done dihedral-angle cutting template angle-cutting tem plate can attached foam blank nails pressed foam can attached cutting jig see Fig 6 template angle half com plement total desired angle both sections must cut match cross sections joint example tendegree angle required template gle will 900 100/2 850 Regardless method should done systematically avoid cutting angle wrong end wrong direction two-panel wings right left sure top up cut root panel except gull wings cut angle outboard section polyhedral wing sure top up cut outer end tip inboard section root outboard section except gull wings same principles apply core cut complete right left panel sectioned polyhedral angle continued Prop Mod/Aycock continued page 31 exact eyeball part just make sure line both blades same OK now have big black line front prop will become high point wood work begins Select rather rough flat wood rasp starting high point work towards leading edge rasp being careful cut away leading edge just take down rather sharp leading edge satisfied same thing again high point towards trailing edge worrying about curved rounded surface just make flat per drawing B Repeat other blade Round off high point shown drawing tips will get quite thin will no way subtract props efficiency should have pile wood dust front now will make some Using 80-grit again hand sand blades rather smooth finish See said hard maple props work best have done respectable job put prop balancing tool should ball park After little practice will able get right money fact time will balanced closer came out box Finish sand blades 280 wet dry dry course done Notice did take anything off back prop blades Thus did alter basic pitch just added airfoil front finished prop should have quite sharp leading trailing edges Leave raw wood finish nothing please Try procedure prop size now using check engine performance airplane flying have found often can go high er pitch prop engine would lug before will turn now author ity Experiment various sizes pitches until get satisfies air remember prop rework can prove itself air ground tach have questions regard ing prop rework please feel free drop line care magazine will happy answer questions Helicopter/B itner continued page 37 altitude 20-60 meters stay within fly course start finish procedures must checked directing official Timing flight can done several ways will tell what method used four timers located south end four north end 94 Model Aviation course positioned line perpendicular start finish course Between line sight course ends vertical pole used reference point As model passed point would acti vate stopwatches times electronically relayed back master screen manned directing official numbers hit screen would vocal ly report cassette recorder avoid confusion error After flight finished times trans ferred recorder paper along information concerning whether run official order speed run accepted timing cannot 2/100 second difference end course watches two timers other words timers chance hitting within range times con verted speed Now will explain what official means speed run First improve communications used citizen-band radios converse point point points being course itself master screen timers also altitude judge As copter flew course altitude judge informed directing official whether altitude between 20 60 meters model enters course correctly stays boundaries course will stated official prepared repeat flight over over because will increase chance good flight get chance go record prepared obtain lot signatures comes time fill out paperwork just about everything requires paper Photographs three-view drawing model will also needed complete dossier will also asked ex plain course measured altutude checked method timing used will require some technical data concerning helicopter such weight overall size rotor blade area disc area power used tail-blade span mechanical ratios fuel capacity must admit lot work involved record over again would Believe will know three times about machine afterwards did before no excuse person break record Just dont break too badly because Im going give another shot someday want acknowledge Manned Spacecraft Center Radio Control Club organizing speed trial because couldnt have done writing advertisers mention read about MA Eliminator/Newton/Wade continued page 40 root tip achieved Use small steel scale marked hundredths inch 01 check alignment tip 1/16 negative root should 1/16 positive alignment correct tighten bolts re-check alignment bake required time After glue baked has cooled trailing edge filed smooth straight Control Units Although Mono-line unit shown plans will go detail its construction because parts readily available have built similar control unit before can find parts numbers plans two-line system can substituted very successfully Mono-line control unit fact reasons originally designing building Eliminator TIso could fly two lines still competitive Mono-line Final Assembly Notes Set up everything glass plate measure before final assembly ensure perfect alignment thrust line Some tooth picks might helpful aligning spar stab Drill some 1/16 holes outboard side February 1 978 95