Helicopters BY NOW lets hope have pur chased Heli-Baby kit doubt finest small helicopter come market date say because fine engineering flight characteristics 1 have over 50 hours air time time fly am im pressed ever before However have found some wear points have made some mods increase life have some very good articles published about building helicopter article will deal flying Heli-Baby dont mean tell fly rather pass find ings old pet engine theory holds true helicopter too have seen flown kinds engines still holds true cannot overpower Heli-Baby either will fly 40 engine can get 40 Schnuerles really fine job shows up make rapid descent try stop before slamming ground two engines have abundant power Webra Speed 40 05 Max 40 Schnuerle have Webra 40 Speed flies one-third throttle leaves wide margin power spare spare power available command Ill tell later use advan tage Some mods must made get engine 1-leli-Baby First drive spool Webra must turned down will go fan recess About 50 thousandths will fine lets fan come too far back strikes carburetor use Kavan carburetor--the 61 fits 40 also front carburetor has cut off miss fan can done zona saw finished file fan still too close air-blade screw place washer between fan drive spool make proper clearance will need make four small slots side frames clear backplate bolts motor will now fit Heli-Baby ease use Kavan carburetor engine First helicopter must have instant engine response must also linear full slow full high carburetor has excellent idle linear way through control arm can loosened positioned needed have set up arm 900 pushrod servo center position air bleed can preset half open before installing K&B 500 fuel will need no further adjust ments Set barrel stop en gine can stopped closing barrel Walt Schoonard low trim Engine should start low throttle middle trim High trim should engage clutch use Schluter starting belt highly recom mend using electric starter over hand starter use Semco 202 CBT muffler very quiet rear ex haust makes very clean running ma chine Heli-Baby weighs 6/2 pounds full tank fuel hovers half throttle flies third extra power does make hot rod rather wide reserve power margin hover just push forward stick will go forward alright run right ground far away will depend high hovering So push ward add some power Now using power hover will get needed extra power transitional flight use forward trim will fly away hands off turn apply rear cyclic left right cyclic add power turn now made little no cyclic control rather power leaves nearly cyclic control left use should need Climbing done same way has enabled loop Heli Baby stock form Recovery loop done power thus tail does drop loop much tighter safer am sure sounds like odd way turn climb must realize main rotor blades very small have little pitch turns climbs made cyclic will doing blade stall will result have able sustained knife-edged flights machine cross wind wind top rotor Start practice lot altitude perfected can head high forward trim achieve lot speed downwind turn cross wind roll left add power some right rudder listen ap plause spectators doing landings transitional flight turn favorite direction roll its side goes downwind come off power suit descent want Turn wind tail rotor let slip towards Hold back cyclic keep nose high stopadd reserve power right rudder watch stop mid air Now forward cyclic reduce power let descend smooth landing Hold some left rudder come off power will make look very professional Now bring power up smoothly add ing little right rudder forward cyclic take off power little rear left cyclic Pull around head tight circle landing again Now stand back take bows have earned Just remember turns recoveries done little cyclic lot power have become acquainted Heli-Baby can spins high altitude adding power left tail-rotor command stop spinning just let go rudder fly out spin Later get brave can spiral take-offs adding power left rudder literally screw sky Almost everywhere go helicopter pilots complain about wind Well let tell litile baby loves wind have flown 30-knot winds state symposiums machine hairy part come land hover requires some deft stick movements some tight concentration recommend adding some weight nose windy conditions Prather stick-on lead great Stick near front end under floor added weight also helpful doing loops know Horace Hagen sug gested \xorks great Wear PointsMods Improve Prevent Failure control arm fly-bar tends move can cause loss control Remove Allen set screw replace Allen cap screw like ones blade holders Cut off proper length will permit larger wrench can tightened wont come loose tail rotor turning same speed engine 12000-14000 rpm some things area need im proved First T/R blades tend sling off am sure can imagine what will happen result simple fix epoxy small piece 32nd plywood back side blade holder area redrill have some 50 hours same T/R blades thus modified Another wear point belt pulley rear centered needle-bearing cages constant pulling tail rotor left wears gear left side will cause T/R shaft move back forth very sloppy T/R centering will result DuBro collars can drilled out use Kavan blade balance collars Put either side T/R shaft outside needle bearings tighten no bind slop pitch plate will have routed out clear collar has moved wear point outside can lubricated easier ad justed out wear occurs pitch con trol plate nylon squeezed between two trim collars heat results can melt nylon happens will lose T/R command will continued page 86 March 1976 19 fidti/iu%fr P 0 D U CT S N C SVILLE ROAD OW GROVE PA 19090 659-3900 NEW. YOULL GET QUITE CHARGE OUT OF THESE Introducing llivans Pylon Brand 12-volt Gel/Cell battery ttery chargertwo great new products flight box See now dealers Gel/Cell Battery Charger Completely dry can never spill leak Never worry about filling water again Lasts full 45 amp hours between recharges Can recharged 1000 times UL listed plugs ordinary house current Fully charges battery 12 hours 500 ma output ideal new battery Can used wet cell batteriestoo start loop airplane going vertically upward 80 up elevator required top loop 310 down elevator necessary air plane going vertically downward 640 up elevator required bottom loop original 100 up elevator will start airplane second loop Compare previous control inputs required perform same size loops 30 ft/sec head wind elevator inputs same points loop 600 740 700 630 600 small elevator input changes required make much easier perfect ioop comparison take look control inputs required perfect loop 30 ft/sec tailwind would take world champion able coordinate substantial control input changes necessary airplane speed loop size wind speed combination results mintmum required control input variation dont really have option make loops too large too small compared what judges looking ever worth investigating charac teristics airplane because opti mum condition may near what judges want can paint three concentric perfectly circular loops sky judges may overlook minor size discrepancy FNWSAER U obby cente oc Last month commented character Class pattern competi tion changed substantially original intent Due difficulty graduating B pattern quality flying proficiency Class has im proved point beginner faces staggering task competing apparently unbeatable group fliers class reaction clubs situation has avoid conflict between truly novice A-pattern fliers good great A-pattern com petitors offering different forms competition common variation standard contest offer Novice Ad vanced Expert categories Class way deciding competes seems vary around country flier competes other fliers nearly same ability has chance win thing dont understand ad vancement points awarded Can clarify situation Another contest variation called Continental Pattern brainchild Canadian Percy Grondin AMA District IX Vice President Jim Mowrey flier makes up own pattern list maneuvers Up 12 maneuvers may chosen list pat tern must include take-off landing perfec tion spot landing maneuver has its own K factor measure difficulty multiplied times score earned maneuver lowest total score flights subtracted high est total score difference divided number categories competi tion resulting number added pro gressively lowest score obtain point spread category Lets try example three categories lowest score 1000 highest 4000 difference 3000 1/3 1000 So categories would 1000-2000 points 2000-3000 points 3000-4000 points Continental Pattern generally al lows fliers nearly same ability compete another equal chance win particular category Un fortunately flier has equal chance lose since few extra points may pro mote flier top category bottom another Nevertheless refreshing approach revitalizing pattern competition Next month plan discuss tech niques determining proper center mass new creation call ing local expert address 12 Connie Dr Shah mar Fla 32579 RC Helicopters continued frnm naoe 19 crash machine right now small washer between collars nylon will provide bearing surface pre vent heat build-up Lubricate tail-rotor bearings flight Yes said flight tail-rotor belt should adjusted just wont slip Check holding main rotor tail rotor Only tighten just wont slip under moderate pres sure probably will find tail boom sandwiched between holding bolts wont easily adjust can improved slotting lower-bolt holes slightly loosened boom slides easily hope article will increase flying pleasure Heli-Baby have developed some hardened tail86 Model Aviation e port continued rotor shafts main-rotor shafts also seesaws three times harder stock also have blade holders dont split blades tip over available Miniature Aircraft Supply 2563 Diversified Way Orlando Fla 32804 Phone 305-422-1531 have Douglas O-38/Midkiff continued paqe 33 ance install free wheeler make prop shaft Assemble prop thrust bearings crankcase cover nose button prop shaft Assembly Assemble top bottom wings rubber bands Check wings parallel other front back shim between bottom wing bottom wing saddle achieve As semble stab its location holding place rubber bands hooked around tail wheel bracket motor anchor tube Assemble rudder through stab paper tube line up straight position 1/32 wire nearest trim hole 1/32 ply plate Flying Make up motor 12 strands er approximately 36 long Install motor ballast achieve center gravity shown Hand glide ship have move CG complete setup Heli-Baby will send anyone sends selfaddressed stamped envelope requesting Heli-Baby setup arent flying arent trying address 2080 Sharon Rd Winter Park Fla 32789 /2 way other prevent stall dive relocate CG original location shim up front stab cure stall back cure dive Test low winds achieve straight out powered glide Add winds just enough down-thrust prevent severe stall Add winds trim either side-thrust slight rudder off-set achieve wide lefthand climbing turn turning should eliminate slight stall ing may have present tempt fly power right careful Mine tendency wind right under maximum winds So suggest either left-right left-left pattern have fortune fly area close clipped grass large wheels will allow beautiful landing roll-out sight alone makes building 0-38 worth I Fuselage olive drab Wings tail group Chrome yellow Drag ring struts landing gear light gray 2 Fuselage struts landing gear drag ring blue Wings tail group Chrome yellow 3 Fuselage drag ring Dark blue Top wings tail group Chrome yellow Bottom wings landing gear Silver lettering numbering White black March 1976 87 TRY SCALE ACCESSORIES KITS INE GUN KITS ENGINE KITS & CYLINDERS PILOTS LS PROPS & HANGERS SPINNERS INGS CANOPIES K COWLS ASK FOR OUR PRODUCTS AT YOUR DEALER OR SEND 25 FOR OUR CATALOG WILLIAMS BROS DEPT M 181 PAWNEE ST SAN MARCOS CA 92069 Suggested Color Schemes
Edition: Model Aviation - 1976/03
Page Numbers: 19, 86, 87
Helicopters BY NOW lets hope have pur chased Heli-Baby kit doubt finest small helicopter come market date say because fine engineering flight characteristics 1 have over 50 hours air time time fly am im pressed ever before However have found some wear points have made some mods increase life have some very good articles published about building helicopter article will deal flying Heli-Baby dont mean tell fly rather pass find ings old pet engine theory holds true helicopter too have seen flown kinds engines still holds true cannot overpower Heli-Baby either will fly 40 engine can get 40 Schnuerles really fine job shows up make rapid descent try stop before slamming ground two engines have abundant power Webra Speed 40 05 Max 40 Schnuerle have Webra 40 Speed flies one-third throttle leaves wide margin power spare spare power available command Ill tell later use advan tage Some mods must made get engine 1-leli-Baby First drive spool Webra must turned down will go fan recess About 50 thousandths will fine lets fan come too far back strikes carburetor use Kavan carburetor--the 61 fits 40 also front carburetor has cut off miss fan can done zona saw finished file fan still too close air-blade screw place washer between fan drive spool make proper clearance will need make four small slots side frames clear backplate bolts motor will now fit Heli-Baby ease use Kavan carburetor engine First helicopter must have instant engine response must also linear full slow full high carburetor has excellent idle linear way through control arm can loosened positioned needed have set up arm 900 pushrod servo center position air bleed can preset half open before installing K&B 500 fuel will need no further adjust ments Set barrel stop en gine can stopped closing barrel Walt Schoonard low trim Engine should start low throttle middle trim High trim should engage clutch use Schluter starting belt highly recom mend using electric starter over hand starter use Semco 202 CBT muffler very quiet rear ex haust makes very clean running ma chine Heli-Baby weighs 6/2 pounds full tank fuel hovers half throttle flies third extra power does make hot rod rather wide reserve power margin hover just push forward stick will go forward alright run right ground far away will depend high hovering So push ward add some power Now using power hover will get needed extra power transitional flight use forward trim will fly away hands off turn apply rear cyclic left right cyclic add power turn now made little no cyclic control rather power leaves nearly cyclic control left use should need Climbing done same way has enabled loop Heli Baby stock form Recovery loop done power thus tail does drop loop much tighter safer am sure sounds like odd way turn climb must realize main rotor blades very small have little pitch turns climbs made cyclic will doing blade stall will result have able sustained knife-edged flights machine cross wind wind top rotor Start practice lot altitude perfected can head high forward trim achieve lot speed downwind turn cross wind roll left add power some right rudder listen ap plause spectators doing landings transitional flight turn favorite direction roll its side goes downwind come off power suit descent want Turn wind tail rotor let slip towards Hold back cyclic keep nose high stopadd reserve power right rudder watch stop mid air Now forward cyclic reduce power let descend smooth landing Hold some left rudder come off power will make look very professional Now bring power up smoothly add ing little right rudder forward cyclic take off power little rear left cyclic Pull around head tight circle landing again Now stand back take bows have earned Just remember turns recoveries done little cyclic lot power have become acquainted Heli-Baby can spins high altitude adding power left tail-rotor command stop spinning just let go rudder fly out spin Later get brave can spiral take-offs adding power left rudder literally screw sky Almost everywhere go helicopter pilots complain about wind Well let tell litile baby loves wind have flown 30-knot winds state symposiums machine hairy part come land hover requires some deft stick movements some tight concentration recommend adding some weight nose windy conditions Prather stick-on lead great Stick near front end under floor added weight also helpful doing loops know Horace Hagen sug gested \xorks great Wear PointsMods Improve Prevent Failure control arm fly-bar tends move can cause loss control Remove Allen set screw replace Allen cap screw like ones blade holders Cut off proper length will permit larger wrench can tightened wont come loose tail rotor turning same speed engine 12000-14000 rpm some things area need im proved First T/R blades tend sling off am sure can imagine what will happen result simple fix epoxy small piece 32nd plywood back side blade holder area redrill have some 50 hours same T/R blades thus modified Another wear point belt pulley rear centered needle-bearing cages constant pulling tail rotor left wears gear left side will cause T/R shaft move back forth very sloppy T/R centering will result DuBro collars can drilled out use Kavan blade balance collars Put either side T/R shaft outside needle bearings tighten no bind slop pitch plate will have routed out clear collar has moved wear point outside can lubricated easier ad justed out wear occurs pitch con trol plate nylon squeezed between two trim collars heat results can melt nylon happens will lose T/R command will continued page 86 March 1976 19 fidti/iu%fr P 0 D U CT S N C SVILLE ROAD OW GROVE PA 19090 659-3900 NEW. YOULL GET QUITE CHARGE OUT OF THESE Introducing llivans Pylon Brand 12-volt Gel/Cell battery ttery chargertwo great new products flight box See now dealers Gel/Cell Battery Charger Completely dry can never spill leak Never worry about filling water again Lasts full 45 amp hours between recharges Can recharged 1000 times UL listed plugs ordinary house current Fully charges battery 12 hours 500 ma output ideal new battery Can used wet cell batteriestoo start loop airplane going vertically upward 80 up elevator required top loop 310 down elevator necessary air plane going vertically downward 640 up elevator required bottom loop original 100 up elevator will start airplane second loop Compare previous control inputs required perform same size loops 30 ft/sec head wind elevator inputs same points loop 600 740 700 630 600 small elevator input changes required make much easier perfect ioop comparison take look control inputs required perfect loop 30 ft/sec tailwind would take world champion able coordinate substantial control input changes necessary airplane speed loop size wind speed combination results mintmum required control input variation dont really have option make loops too large too small compared what judges looking ever worth investigating charac teristics airplane because opti mum condition may near what judges want can paint three concentric perfectly circular loops sky judges may overlook minor size discrepancy FNWSAER U obby cente oc Last month commented character Class pattern competi tion changed substantially original intent Due difficulty graduating B pattern quality flying proficiency Class has im proved point beginner faces staggering task competing apparently unbeatable group fliers class reaction clubs situation has avoid conflict between truly novice A-pattern fliers good great A-pattern com petitors offering different forms competition common variation standard contest offer Novice Ad vanced Expert categories Class way deciding competes seems vary around country flier competes other fliers nearly same ability has chance win thing dont understand ad vancement points awarded Can clarify situation Another contest variation called Continental Pattern brainchild Canadian Percy Grondin AMA District IX Vice President Jim Mowrey flier makes up own pattern list maneuvers Up 12 maneuvers may chosen list pat tern must include take-off landing perfec tion spot landing maneuver has its own K factor measure difficulty multiplied times score earned maneuver lowest total score flights subtracted high est total score difference divided number categories competi tion resulting number added pro gressively lowest score obtain point spread category Lets try example three categories lowest score 1000 highest 4000 difference 3000 1/3 1000 So categories would 1000-2000 points 2000-3000 points 3000-4000 points Continental Pattern generally al lows fliers nearly same ability compete another equal chance win particular category Un fortunately flier has equal chance lose since few extra points may pro mote flier top category bottom another Nevertheless refreshing approach revitalizing pattern competition Next month plan discuss tech niques determining proper center mass new creation call ing local expert address 12 Connie Dr Shah mar Fla 32579 RC Helicopters continued frnm naoe 19 crash machine right now small washer between collars nylon will provide bearing surface pre vent heat build-up Lubricate tail-rotor bearings flight Yes said flight tail-rotor belt should adjusted just wont slip Check holding main rotor tail rotor Only tighten just wont slip under moderate pres sure probably will find tail boom sandwiched between holding bolts wont easily adjust can improved slotting lower-bolt holes slightly loosened boom slides easily hope article will increase flying pleasure Heli-Baby have developed some hardened tail86 Model Aviation e port continued rotor shafts main-rotor shafts also seesaws three times harder stock also have blade holders dont split blades tip over available Miniature Aircraft Supply 2563 Diversified Way Orlando Fla 32804 Phone 305-422-1531 have Douglas O-38/Midkiff continued paqe 33 ance install free wheeler make prop shaft Assemble prop thrust bearings crankcase cover nose button prop shaft Assembly Assemble top bottom wings rubber bands Check wings parallel other front back shim between bottom wing bottom wing saddle achieve As semble stab its location holding place rubber bands hooked around tail wheel bracket motor anchor tube Assemble rudder through stab paper tube line up straight position 1/32 wire nearest trim hole 1/32 ply plate Flying Make up motor 12 strands er approximately 36 long Install motor ballast achieve center gravity shown Hand glide ship have move CG complete setup Heli-Baby will send anyone sends selfaddressed stamped envelope requesting Heli-Baby setup arent flying arent trying address 2080 Sharon Rd Winter Park Fla 32789 /2 way other prevent stall dive relocate CG original location shim up front stab cure stall back cure dive Test low winds achieve straight out powered glide Add winds just enough down-thrust prevent severe stall Add winds trim either side-thrust slight rudder off-set achieve wide lefthand climbing turn turning should eliminate slight stall ing may have present tempt fly power right careful Mine tendency wind right under maximum winds So suggest either left-right left-left pattern have fortune fly area close clipped grass large wheels will allow beautiful landing roll-out sight alone makes building 0-38 worth I Fuselage olive drab Wings tail group Chrome yellow Drag ring struts landing gear light gray 2 Fuselage struts landing gear drag ring blue Wings tail group Chrome yellow 3 Fuselage drag ring Dark blue Top wings tail group Chrome yellow Bottom wings landing gear Silver lettering numbering White black March 1976 87 TRY SCALE ACCESSORIES KITS INE GUN KITS ENGINE KITS & CYLINDERS PILOTS LS PROPS & HANGERS SPINNERS INGS CANOPIES K COWLS ASK FOR OUR PRODUCTS AT YOUR DEALER OR SEND 25 FOR OUR CATALOG WILLIAMS BROS DEPT M 181 PAWNEE ST SAN MARCOS CA 92069 Suggested Color Schemes
Edition: Model Aviation - 1976/03
Page Numbers: 19, 86, 87
Helicopters BY NOW lets hope have pur chased Heli-Baby kit doubt finest small helicopter come market date say because fine engineering flight characteristics 1 have over 50 hours air time time fly am im pressed ever before However have found some wear points have made some mods increase life have some very good articles published about building helicopter article will deal flying Heli-Baby dont mean tell fly rather pass find ings old pet engine theory holds true helicopter too have seen flown kinds engines still holds true cannot overpower Heli-Baby either will fly 40 engine can get 40 Schnuerles really fine job shows up make rapid descent try stop before slamming ground two engines have abundant power Webra Speed 40 05 Max 40 Schnuerle have Webra 40 Speed flies one-third throttle leaves wide margin power spare spare power available command Ill tell later use advan tage Some mods must made get engine 1-leli-Baby First drive spool Webra must turned down will go fan recess About 50 thousandths will fine lets fan come too far back strikes carburetor use Kavan carburetor--the 61 fits 40 also front carburetor has cut off miss fan can done zona saw finished file fan still too close air-blade screw place washer between fan drive spool make proper clearance will need make four small slots side frames clear backplate bolts motor will now fit Heli-Baby ease use Kavan carburetor engine First helicopter must have instant engine response must also linear full slow full high carburetor has excellent idle linear way through control arm can loosened positioned needed have set up arm 900 pushrod servo center position air bleed can preset half open before installing K&B 500 fuel will need no further adjust ments Set barrel stop en gine can stopped closing barrel Walt Schoonard low trim Engine should start low throttle middle trim High trim should engage clutch use Schluter starting belt highly recom mend using electric starter over hand starter use Semco 202 CBT muffler very quiet rear ex haust makes very clean running ma chine Heli-Baby weighs 6/2 pounds full tank fuel hovers half throttle flies third extra power does make hot rod rather wide reserve power margin hover just push forward stick will go forward alright run right ground far away will depend high hovering So push ward add some power Now using power hover will get needed extra power transitional flight use forward trim will fly away hands off turn apply rear cyclic left right cyclic add power turn now made little no cyclic control rather power leaves nearly cyclic control left use should need Climbing done same way has enabled loop Heli Baby stock form Recovery loop done power thus tail does drop loop much tighter safer am sure sounds like odd way turn climb must realize main rotor blades very small have little pitch turns climbs made cyclic will doing blade stall will result have able sustained knife-edged flights machine cross wind wind top rotor Start practice lot altitude perfected can head high forward trim achieve lot speed downwind turn cross wind roll left add power some right rudder listen ap plause spectators doing landings transitional flight turn favorite direction roll its side goes downwind come off power suit descent want Turn wind tail rotor let slip towards Hold back cyclic keep nose high stopadd reserve power right rudder watch stop mid air Now forward cyclic reduce power let descend smooth landing Hold some left rudder come off power will make look very professional Now bring power up smoothly add ing little right rudder forward cyclic take off power little rear left cyclic Pull around head tight circle landing again Now stand back take bows have earned Just remember turns recoveries done little cyclic lot power have become acquainted Heli-Baby can spins high altitude adding power left tail-rotor command stop spinning just let go rudder fly out spin Later get brave can spiral take-offs adding power left rudder literally screw sky Almost everywhere go helicopter pilots complain about wind Well let tell litile baby loves wind have flown 30-knot winds state symposiums machine hairy part come land hover requires some deft stick movements some tight concentration recommend adding some weight nose windy conditions Prather stick-on lead great Stick near front end under floor added weight also helpful doing loops know Horace Hagen sug gested \xorks great Wear PointsMods Improve Prevent Failure control arm fly-bar tends move can cause loss control Remove Allen set screw replace Allen cap screw like ones blade holders Cut off proper length will permit larger wrench can tightened wont come loose tail rotor turning same speed engine 12000-14000 rpm some things area need im proved First T/R blades tend sling off am sure can imagine what will happen result simple fix epoxy small piece 32nd plywood back side blade holder area redrill have some 50 hours same T/R blades thus modified Another wear point belt pulley rear centered needle-bearing cages constant pulling tail rotor left wears gear left side will cause T/R shaft move back forth very sloppy T/R centering will result DuBro collars can drilled out use Kavan blade balance collars Put either side T/R shaft outside needle bearings tighten no bind slop pitch plate will have routed out clear collar has moved wear point outside can lubricated easier ad justed out wear occurs pitch con trol plate nylon squeezed between two trim collars heat results can melt nylon happens will lose T/R command will continued page 86 March 1976 19 fidti/iu%fr P 0 D U CT S N C SVILLE ROAD OW GROVE PA 19090 659-3900 NEW. YOULL GET QUITE CHARGE OUT OF THESE Introducing llivans Pylon Brand 12-volt Gel/Cell battery ttery chargertwo great new products flight box See now dealers Gel/Cell Battery Charger Completely dry can never spill leak Never worry about filling water again Lasts full 45 amp hours between recharges Can recharged 1000 times UL listed plugs ordinary house current Fully charges battery 12 hours 500 ma output ideal new battery Can used wet cell batteriestoo start loop airplane going vertically upward 80 up elevator required top loop 310 down elevator necessary air plane going vertically downward 640 up elevator required bottom loop original 100 up elevator will start airplane second loop Compare previous control inputs required perform same size loops 30 ft/sec head wind elevator inputs same points loop 600 740 700 630 600 small elevator input changes required make much easier perfect ioop comparison take look control inputs required perfect loop 30 ft/sec tailwind would take world champion able coordinate substantial control input changes necessary airplane speed loop size wind speed combination results mintmum required control input variation dont really have option make loops too large too small compared what judges looking ever worth investigating charac teristics airplane because opti mum condition may near what judges want can paint three concentric perfectly circular loops sky judges may overlook minor size discrepancy FNWSAER U obby cente oc Last month commented character Class pattern competi tion changed substantially original intent Due difficulty graduating B pattern quality flying proficiency Class has im proved point beginner faces staggering task competing apparently unbeatable group fliers class reaction clubs situation has avoid conflict between truly novice A-pattern fliers good great A-pattern com petitors offering different forms competition common variation standard contest offer Novice Ad vanced Expert categories Class way deciding competes seems vary around country flier competes other fliers nearly same ability has chance win thing dont understand ad vancement points awarded Can clarify situation Another contest variation called Continental Pattern brainchild Canadian Percy Grondin AMA District IX Vice President Jim Mowrey flier makes up own pattern list maneuvers Up 12 maneuvers may chosen list pat tern must include take-off landing perfec tion spot landing maneuver has its own K factor measure difficulty multiplied times score earned maneuver lowest total score flights subtracted high est total score difference divided number categories competi tion resulting number added pro gressively lowest score obtain point spread category Lets try example three categories lowest score 1000 highest 4000 difference 3000 1/3 1000 So categories would 1000-2000 points 2000-3000 points 3000-4000 points Continental Pattern generally al lows fliers nearly same ability compete another equal chance win particular category Un fortunately flier has equal chance lose since few extra points may pro mote flier top category bottom another Nevertheless refreshing approach revitalizing pattern competition Next month plan discuss tech niques determining proper center mass new creation call ing local expert address 12 Connie Dr Shah mar Fla 32579 RC Helicopters continued frnm naoe 19 crash machine right now small washer between collars nylon will provide bearing surface pre vent heat build-up Lubricate tail-rotor bearings flight Yes said flight tail-rotor belt should adjusted just wont slip Check holding main rotor tail rotor Only tighten just wont slip under moderate pres sure probably will find tail boom sandwiched between holding bolts wont easily adjust can improved slotting lower-bolt holes slightly loosened boom slides easily hope article will increase flying pleasure Heli-Baby have developed some hardened tail86 Model Aviation e port continued rotor shafts main-rotor shafts also seesaws three times harder stock also have blade holders dont split blades tip over available Miniature Aircraft Supply 2563 Diversified Way Orlando Fla 32804 Phone 305-422-1531 have Douglas O-38/Midkiff continued paqe 33 ance install free wheeler make prop shaft Assemble prop thrust bearings crankcase cover nose button prop shaft Assembly Assemble top bottom wings rubber bands Check wings parallel other front back shim between bottom wing bottom wing saddle achieve As semble stab its location holding place rubber bands hooked around tail wheel bracket motor anchor tube Assemble rudder through stab paper tube line up straight position 1/32 wire nearest trim hole 1/32 ply plate Flying Make up motor 12 strands er approximately 36 long Install motor ballast achieve center gravity shown Hand glide ship have move CG complete setup Heli-Baby will send anyone sends selfaddressed stamped envelope requesting Heli-Baby setup arent flying arent trying address 2080 Sharon Rd Winter Park Fla 32789 /2 way other prevent stall dive relocate CG original location shim up front stab cure stall back cure dive Test low winds achieve straight out powered glide Add winds just enough down-thrust prevent severe stall Add winds trim either side-thrust slight rudder off-set achieve wide lefthand climbing turn turning should eliminate slight stall ing may have present tempt fly power right careful Mine tendency wind right under maximum winds So suggest either left-right left-left pattern have fortune fly area close clipped grass large wheels will allow beautiful landing roll-out sight alone makes building 0-38 worth I Fuselage olive drab Wings tail group Chrome yellow Drag ring struts landing gear light gray 2 Fuselage struts landing gear drag ring blue Wings tail group Chrome yellow 3 Fuselage drag ring Dark blue Top wings tail group Chrome yellow Bottom wings landing gear Silver lettering numbering White black March 1976 87 TRY SCALE ACCESSORIES KITS INE GUN KITS ENGINE KITS & CYLINDERS PILOTS LS PROPS & HANGERS SPINNERS INGS CANOPIES K COWLS ASK FOR OUR PRODUCTS AT YOUR DEALER OR SEND 25 FOR OUR CATALOG WILLIAMS BROS DEPT M 181 PAWNEE ST SAN MARCOS CA 92069 Suggested Color Schemes