3 Helicopters El Wall Schoonard HAVE BEEN telling would fill Bill Youmans head mods soon gave permission has just given few days ago meantime similar mod published September issue Model Builder magazine odd thing about Bill developed mods long hours trial error Mr Kavan done practically same thing some time ago am totally convinced Bill work ing outside help influence guess old saying great minds work same paths still holds true people Florida Helicopter Assoc including myself have pleasure flying system past year am sorry could share before now may wish make mods rotor head compare two different approaches see like best described Model Builder gives 188 fly bar blade feather ratio Bill gives difference brought about pivot point mix levers Voumans Head Mods fly bars control cage should removed rotor head Remove seesaw us ing small punch drive out rivets hold mix levers Drill 3/32-in hole 30 mm out old hole side seesaw Drill out mix lever pivot 3/32-in File off braded por tion outer ball unsolder outer balls Remove balls spacers inner spacers should filed 5/16-in length outer spacer should filed Yi-in length Reassemble mix levers solder outer balls place sure get solder ball self Make new rivets 3/32-in brass tubing reassemble levers seesaw new holes spread ends tubing rivets Remove steel yoke head remove needle bearings Now comes hard part Two brass bushings must formed will flush outside have small lip inside act retainer spacer steel yoke brass bushings pressed place must cen ter drilled fit original pivot shaft shaft will have cut off flush brass bushings Now remove pitch arms blade holders Put vise side side can bent middle large area Using block wood hammer bend about reinstalled center ball should 20 mm head holders 0 degrees Place pitch Continued page 86 24 Model Aviation First successful flight three-bladed rigid rotor system Flies 11/2 degrees pitch Reversed mixers seesaw giving ratio Bill Youmans head modifications described text system can adjusted fly hands off stiff wind yet aerobatic wish Swashplate risers going straight up reversed mixers Note bend pitch arms Also described Walt set-up Jet Ranger Combined Vouman mods result superb handling Hirobo Aerospatlale SA-i4U Gazelle will available soon Featured collective pitch Hiller Bell Note tail rotor ducted fan Another view Walts Jet Ranger rigid head fly-barless fully articulated blades very quick response tion immediate reaction con cern airplane didnt feel better about forthcoming test flight would rest go Well found hiding bushes about 100 feet down wind except dent two seemed okay fueled turkey up let warmi up really didnt have shutoff did want test full bag fuel days gone flew single channel five minutes worth lazy rolls aileron Finally launch time whipped out hands like small arrow after few moments seemed oblivious wind thoroughly enjoyable little craft capable maneuvers requiring rudder cidentally penetrates very well did best land short no difficulty stretching runway youre hesitat ing get Baby Turkey $1495 youll have airplane paid very positive stable airplane within capability newest novice recommend Bob Root has made some interesting ob servations about Cox 15 QM faster Coxs run non-finned high-com pression head no copper head gasket Several paper crankcase gaskets need ed get proper head clearance Add gas kets until maximum rpm achieved usually occurs head clearance tween 9 12 thousandths best prop seems Rev-up 7-SN cut down between 6 6 diameter thinned give ground rpm 21500 22500 Unless QM rule changed will illegal anything props other balancing movement eliminate stock prop rule QM Joe Klause submitted following obser vations problem stock engines QM Under QMRC rules competitors required use stock engines other words called custom-tuned engines big no no Fine except may just some room some honest serious questions about engine ceases stock say Stock stock isnt Everybody knows So sayings go Well simple matter fact far major percentage custom tuning volves nothing ensuring good fit between parts engine less fric tionmore horsepower Now nothing else done other properly fitting engine still stock reason product review product review product review another some guys will say no tent unquestionably honest However few questions come mind put gaskets between two parts Cox 15 case suggested Bob Root arent really changing exhaust bypass timing well head spacing Next someone might ask thats dif ferent putting gasket under Rossi 15 sleeve Someone may say gaskets part Cox Rossi what purpose Cox crankcase gasket answer seal say its also change tim ing etc have said can tune engine rather let stock out box illegal properly align bearings Everybody would probably agree its okay replace bad bearing illegal en sure its proper alignment Similarly illegal change sleeves pistons too wear out unquestionably some combinations lot better others have combination fits together well youll probably have really good engine seem straightforward valid questions Unfortunately tend shoot holes through so-called stock engine bit Because problem definition too often triggers off petty insinuations acrimony among competitors Give little thought importantly remember rule easily practically en forceable really useless Next month will have report hap penings Reno will judging pylons again year Thats now Go fast turn left Dave Lane 4477 W 136th St Haw thorne CA 90250 RC Helicopters/Schoonard continued page 24 arms vise file flat pitch arm small end inside bend Using good hard epoxy replace pitch arms blade holders sure square side blade holders Reassemble head seesaw Replace metal paddles large wood paddles Kavan part #3318A risers swashplate will have shortened mix levers will center seesaw full collective trim half collective stick system now ready run up check blade tracking will have have least 10 mm collective travel swashplate-tilt travel can adjusted suit style flying system can adjusted fly hands off stiff wind yet acrobatic wish will find heli copter will very easy fly compari son stock head interested smooth realistic flight am sure going enjoy Bills head mods 86 Model Aviation HOWTO DROP HINT THAT YOU WANT RC HELl KIT FOR CHRISTMAS youve good yeer think deserve Radio Controlled Heli copter Kit present dont want ask outright res whet Fold paper thIs ad showIng S clip ad end leave lying breakfast table wifes sewing dress ing table e front TV set kids wiil see THEYLL GET THE HINT THEYLL KNOW WHERE TO GO FOR THE KIT YOU WANT us experts Radio Con trolled Helicopter Model Kits because stock build know sell anyone else Latest Royal Tach-Tron model RC Helicopters collective pitch systems Provides electronically governed Main Rotor RPM thru control throttle automatic control collective pitch Flown extensively over past year helicopter pllotsHighly recommended Wtonly 2 ounces Installation instructions #5268 Royal Tach-Tron System $6495 Lsenct Si br new helicopter catalog & parts list write ModeiHe opesD son SC MODELER HOBBY SHOP Hells Planes Cars Boats Radios Parts RC Hobbyists 1999 Larkin Avenue Elgin Illinois 60120 Dept 132312-697-37374 product review product review product review Midwest Hawk Hawk almost readyto-f lv kit AC Soaring need ironon covering material flying surfaces primer color paint fuselage Man ufacturer states toughest materials used provide airplane almost destructible Shipped its own molded foam case can used going flying field Replacement parts available Midwest Products Co Inc 400 South Indi ans St Hobart IN 46342 have modified several heads described Model Builder much easier gives almost same results will have decide cup tea Jet Ranger Setup people have com mented about smooth effortless Jet Ranger flies Recently doing some flight demonstrations man taking bets gyro dont fly gyro Jet Ranger set up per manual set up Assuming have good Schnuerle-ported engine will deliver plenty reserve power will idle well lets go through step step full throttle trim engine should start full low trim should shut off full throttle trim half collective adjust swashplate risers mixers seesaw center neutral position point collective bellcranks servo plate should vertical will have equal travel up down full throttle trim half collective stick carburetor opening should pen tail-rotor mix bar should set collective-servo wheel will give minimal mix possible tailrotor control rod takeoff ball mix lever should far forwards tailrotor servo possible still its slot pick-off point tail-rotor servo should far out its wheel possible pushrod tail-rotor bellcrank should innermost hole tail-rotor blades should drilled 1/4 closer end order increase size tail-rotor disc Now adjust pitch main blades about 4/2 degrees half-collective stick Adjust tail-rotor pitch high trim low collective stick about 0 degrees Now start up run up blade speed Adjust main-blade pitch lift-off have between 5100 5300 rpm tail rotor tweak needle valve get blade speed rather reduce pitch Mine lifts off 5300 rpm Kraft engine K&B 500 fuel still four-cy cling Youman head mods set up described properly trimmed machine should fly hands offeven stiff wind World-Wide RC Helicopter Symposium Tentative plans being made bring together RC manufacturers world Orlando FL December 28-30 1977 along factory demon stration teams Also radio engine fuel other related product manufacturers will day booth displays day factory flight demonstrations day set aside fly get help whatever wish will space display own work art new ideas special awards best show Next months column will have final details Plan attend youre flying youre trying hard enough Walt Schoonard 2080 Sharon Rd Winter Park FL 32789 LSF Tournament/Pruss continued page 30 scale participation level Vs competed three four finished top five respective categories. protest filed. comparing weather scores its safe say bigger planes fly better. scheduled rounds 7 flown sites e Alas ka missed third place point. 42 en tered best technical achievement forms will heard about later date. 41 Junior/Seniors competed. first year manufacturers solicited supporta thanks past sponsorship. ues membership over 2500 mark tournament time500 outside USA. gue gains financial support its membership through con tributions sent PDV forms through tournaments bership free can obtained writing League Silent Flight Box 39068 Chi cago IL 60639 December 1977 87
Edition: Model Aviation - 1977/12
Page Numbers: 24, 86, 87
3 Helicopters El Wall Schoonard HAVE BEEN telling would fill Bill Youmans head mods soon gave permission has just given few days ago meantime similar mod published September issue Model Builder magazine odd thing about Bill developed mods long hours trial error Mr Kavan done practically same thing some time ago am totally convinced Bill work ing outside help influence guess old saying great minds work same paths still holds true people Florida Helicopter Assoc including myself have pleasure flying system past year am sorry could share before now may wish make mods rotor head compare two different approaches see like best described Model Builder gives 188 fly bar blade feather ratio Bill gives difference brought about pivot point mix levers Voumans Head Mods fly bars control cage should removed rotor head Remove seesaw us ing small punch drive out rivets hold mix levers Drill 3/32-in hole 30 mm out old hole side seesaw Drill out mix lever pivot 3/32-in File off braded por tion outer ball unsolder outer balls Remove balls spacers inner spacers should filed 5/16-in length outer spacer should filed Yi-in length Reassemble mix levers solder outer balls place sure get solder ball self Make new rivets 3/32-in brass tubing reassemble levers seesaw new holes spread ends tubing rivets Remove steel yoke head remove needle bearings Now comes hard part Two brass bushings must formed will flush outside have small lip inside act retainer spacer steel yoke brass bushings pressed place must cen ter drilled fit original pivot shaft shaft will have cut off flush brass bushings Now remove pitch arms blade holders Put vise side side can bent middle large area Using block wood hammer bend about reinstalled center ball should 20 mm head holders 0 degrees Place pitch Continued page 86 24 Model Aviation First successful flight three-bladed rigid rotor system Flies 11/2 degrees pitch Reversed mixers seesaw giving ratio Bill Youmans head modifications described text system can adjusted fly hands off stiff wind yet aerobatic wish Swashplate risers going straight up reversed mixers Note bend pitch arms Also described Walt set-up Jet Ranger Combined Vouman mods result superb handling Hirobo Aerospatlale SA-i4U Gazelle will available soon Featured collective pitch Hiller Bell Note tail rotor ducted fan Another view Walts Jet Ranger rigid head fly-barless fully articulated blades very quick response tion immediate reaction con cern airplane didnt feel better about forthcoming test flight would rest go Well found hiding bushes about 100 feet down wind except dent two seemed okay fueled turkey up let warmi up really didnt have shutoff did want test full bag fuel days gone flew single channel five minutes worth lazy rolls aileron Finally launch time whipped out hands like small arrow after few moments seemed oblivious wind thoroughly enjoyable little craft capable maneuvers requiring rudder cidentally penetrates very well did best land short no difficulty stretching runway youre hesitat ing get Baby Turkey $1495 youll have airplane paid very positive stable airplane within capability newest novice recommend Bob Root has made some interesting ob servations about Cox 15 QM faster Coxs run non-finned high-com pression head no copper head gasket Several paper crankcase gaskets need ed get proper head clearance Add gas kets until maximum rpm achieved usually occurs head clearance tween 9 12 thousandths best prop seems Rev-up 7-SN cut down between 6 6 diameter thinned give ground rpm 21500 22500 Unless QM rule changed will illegal anything props other balancing movement eliminate stock prop rule QM Joe Klause submitted following obser vations problem stock engines QM Under QMRC rules competitors required use stock engines other words called custom-tuned engines big no no Fine except may just some room some honest serious questions about engine ceases stock say Stock stock isnt Everybody knows So sayings go Well simple matter fact far major percentage custom tuning volves nothing ensuring good fit between parts engine less fric tionmore horsepower Now nothing else done other properly fitting engine still stock reason product review product review product review another some guys will say no tent unquestionably honest However few questions come mind put gaskets between two parts Cox 15 case suggested Bob Root arent really changing exhaust bypass timing well head spacing Next someone might ask thats dif ferent putting gasket under Rossi 15 sleeve Someone may say gaskets part Cox Rossi what purpose Cox crankcase gasket answer seal say its also change tim ing etc have said can tune engine rather let stock out box illegal properly align bearings Everybody would probably agree its okay replace bad bearing illegal en sure its proper alignment Similarly illegal change sleeves pistons too wear out unquestionably some combinations lot better others have combination fits together well youll probably have really good engine seem straightforward valid questions Unfortunately tend shoot holes through so-called stock engine bit Because problem definition too often triggers off petty insinuations acrimony among competitors Give little thought importantly remember rule easily practically en forceable really useless Next month will have report hap penings Reno will judging pylons again year Thats now Go fast turn left Dave Lane 4477 W 136th St Haw thorne CA 90250 RC Helicopters/Schoonard continued page 24 arms vise file flat pitch arm small end inside bend Using good hard epoxy replace pitch arms blade holders sure square side blade holders Reassemble head seesaw Replace metal paddles large wood paddles Kavan part #3318A risers swashplate will have shortened mix levers will center seesaw full collective trim half collective stick system now ready run up check blade tracking will have have least 10 mm collective travel swashplate-tilt travel can adjusted suit style flying system can adjusted fly hands off stiff wind yet acrobatic wish will find heli copter will very easy fly compari son stock head interested smooth realistic flight am sure going enjoy Bills head mods 86 Model Aviation HOWTO DROP HINT THAT YOU WANT RC HELl KIT FOR CHRISTMAS youve good yeer think deserve Radio Controlled Heli copter Kit present dont want ask outright res whet Fold paper thIs ad showIng S clip ad end leave lying breakfast table wifes sewing dress ing table e front TV set kids wiil see THEYLL GET THE HINT THEYLL KNOW WHERE TO GO FOR THE KIT YOU WANT us experts Radio Con trolled Helicopter Model Kits because stock build know sell anyone else Latest Royal Tach-Tron model RC Helicopters collective pitch systems Provides electronically governed Main Rotor RPM thru control throttle automatic control collective pitch Flown extensively over past year helicopter pllotsHighly recommended Wtonly 2 ounces Installation instructions #5268 Royal Tach-Tron System $6495 Lsenct Si br new helicopter catalog & parts list write ModeiHe opesD son SC MODELER HOBBY SHOP Hells Planes Cars Boats Radios Parts RC Hobbyists 1999 Larkin Avenue Elgin Illinois 60120 Dept 132312-697-37374 product review product review product review Midwest Hawk Hawk almost readyto-f lv kit AC Soaring need ironon covering material flying surfaces primer color paint fuselage Man ufacturer states toughest materials used provide airplane almost destructible Shipped its own molded foam case can used going flying field Replacement parts available Midwest Products Co Inc 400 South Indi ans St Hobart IN 46342 have modified several heads described Model Builder much easier gives almost same results will have decide cup tea Jet Ranger Setup people have com mented about smooth effortless Jet Ranger flies Recently doing some flight demonstrations man taking bets gyro dont fly gyro Jet Ranger set up per manual set up Assuming have good Schnuerle-ported engine will deliver plenty reserve power will idle well lets go through step step full throttle trim engine should start full low trim should shut off full throttle trim half collective adjust swashplate risers mixers seesaw center neutral position point collective bellcranks servo plate should vertical will have equal travel up down full throttle trim half collective stick carburetor opening should pen tail-rotor mix bar should set collective-servo wheel will give minimal mix possible tailrotor control rod takeoff ball mix lever should far forwards tailrotor servo possible still its slot pick-off point tail-rotor servo should far out its wheel possible pushrod tail-rotor bellcrank should innermost hole tail-rotor blades should drilled 1/4 closer end order increase size tail-rotor disc Now adjust pitch main blades about 4/2 degrees half-collective stick Adjust tail-rotor pitch high trim low collective stick about 0 degrees Now start up run up blade speed Adjust main-blade pitch lift-off have between 5100 5300 rpm tail rotor tweak needle valve get blade speed rather reduce pitch Mine lifts off 5300 rpm Kraft engine K&B 500 fuel still four-cy cling Youman head mods set up described properly trimmed machine should fly hands offeven stiff wind World-Wide RC Helicopter Symposium Tentative plans being made bring together RC manufacturers world Orlando FL December 28-30 1977 along factory demon stration teams Also radio engine fuel other related product manufacturers will day booth displays day factory flight demonstrations day set aside fly get help whatever wish will space display own work art new ideas special awards best show Next months column will have final details Plan attend youre flying youre trying hard enough Walt Schoonard 2080 Sharon Rd Winter Park FL 32789 LSF Tournament/Pruss continued page 30 scale participation level Vs competed three four finished top five respective categories. protest filed. comparing weather scores its safe say bigger planes fly better. scheduled rounds 7 flown sites e Alas ka missed third place point. 42 en tered best technical achievement forms will heard about later date. 41 Junior/Seniors competed. first year manufacturers solicited supporta thanks past sponsorship. ues membership over 2500 mark tournament time500 outside USA. gue gains financial support its membership through con tributions sent PDV forms through tournaments bership free can obtained writing League Silent Flight Box 39068 Chi cago IL 60639 December 1977 87
Edition: Model Aviation - 1977/12
Page Numbers: 24, 86, 87
3 Helicopters El Wall Schoonard HAVE BEEN telling would fill Bill Youmans head mods soon gave permission has just given few days ago meantime similar mod published September issue Model Builder magazine odd thing about Bill developed mods long hours trial error Mr Kavan done practically same thing some time ago am totally convinced Bill work ing outside help influence guess old saying great minds work same paths still holds true people Florida Helicopter Assoc including myself have pleasure flying system past year am sorry could share before now may wish make mods rotor head compare two different approaches see like best described Model Builder gives 188 fly bar blade feather ratio Bill gives difference brought about pivot point mix levers Voumans Head Mods fly bars control cage should removed rotor head Remove seesaw us ing small punch drive out rivets hold mix levers Drill 3/32-in hole 30 mm out old hole side seesaw Drill out mix lever pivot 3/32-in File off braded por tion outer ball unsolder outer balls Remove balls spacers inner spacers should filed 5/16-in length outer spacer should filed Yi-in length Reassemble mix levers solder outer balls place sure get solder ball self Make new rivets 3/32-in brass tubing reassemble levers seesaw new holes spread ends tubing rivets Remove steel yoke head remove needle bearings Now comes hard part Two brass bushings must formed will flush outside have small lip inside act retainer spacer steel yoke brass bushings pressed place must cen ter drilled fit original pivot shaft shaft will have cut off flush brass bushings Now remove pitch arms blade holders Put vise side side can bent middle large area Using block wood hammer bend about reinstalled center ball should 20 mm head holders 0 degrees Place pitch Continued page 86 24 Model Aviation First successful flight three-bladed rigid rotor system Flies 11/2 degrees pitch Reversed mixers seesaw giving ratio Bill Youmans head modifications described text system can adjusted fly hands off stiff wind yet aerobatic wish Swashplate risers going straight up reversed mixers Note bend pitch arms Also described Walt set-up Jet Ranger Combined Vouman mods result superb handling Hirobo Aerospatlale SA-i4U Gazelle will available soon Featured collective pitch Hiller Bell Note tail rotor ducted fan Another view Walts Jet Ranger rigid head fly-barless fully articulated blades very quick response tion immediate reaction con cern airplane didnt feel better about forthcoming test flight would rest go Well found hiding bushes about 100 feet down wind except dent two seemed okay fueled turkey up let warmi up really didnt have shutoff did want test full bag fuel days gone flew single channel five minutes worth lazy rolls aileron Finally launch time whipped out hands like small arrow after few moments seemed oblivious wind thoroughly enjoyable little craft capable maneuvers requiring rudder cidentally penetrates very well did best land short no difficulty stretching runway youre hesitat ing get Baby Turkey $1495 youll have airplane paid very positive stable airplane within capability newest novice recommend Bob Root has made some interesting ob servations about Cox 15 QM faster Coxs run non-finned high-com pression head no copper head gasket Several paper crankcase gaskets need ed get proper head clearance Add gas kets until maximum rpm achieved usually occurs head clearance tween 9 12 thousandths best prop seems Rev-up 7-SN cut down between 6 6 diameter thinned give ground rpm 21500 22500 Unless QM rule changed will illegal anything props other balancing movement eliminate stock prop rule QM Joe Klause submitted following obser vations problem stock engines QM Under QMRC rules competitors required use stock engines other words called custom-tuned engines big no no Fine except may just some room some honest serious questions about engine ceases stock say Stock stock isnt Everybody knows So sayings go Well simple matter fact far major percentage custom tuning volves nothing ensuring good fit between parts engine less fric tionmore horsepower Now nothing else done other properly fitting engine still stock reason product review product review product review another some guys will say no tent unquestionably honest However few questions come mind put gaskets between two parts Cox 15 case suggested Bob Root arent really changing exhaust bypass timing well head spacing Next someone might ask thats dif ferent putting gasket under Rossi 15 sleeve Someone may say gaskets part Cox Rossi what purpose Cox crankcase gasket answer seal say its also change tim ing etc have said can tune engine rather let stock out box illegal properly align bearings Everybody would probably agree its okay replace bad bearing illegal en sure its proper alignment Similarly illegal change sleeves pistons too wear out unquestionably some combinations lot better others have combination fits together well youll probably have really good engine seem straightforward valid questions Unfortunately tend shoot holes through so-called stock engine bit Because problem definition too often triggers off petty insinuations acrimony among competitors Give little thought importantly remember rule easily practically en forceable really useless Next month will have report hap penings Reno will judging pylons again year Thats now Go fast turn left Dave Lane 4477 W 136th St Haw thorne CA 90250 RC Helicopters/Schoonard continued page 24 arms vise file flat pitch arm small end inside bend Using good hard epoxy replace pitch arms blade holders sure square side blade holders Reassemble head seesaw Replace metal paddles large wood paddles Kavan part #3318A risers swashplate will have shortened mix levers will center seesaw full collective trim half collective stick system now ready run up check blade tracking will have have least 10 mm collective travel swashplate-tilt travel can adjusted suit style flying system can adjusted fly hands off stiff wind yet acrobatic wish will find heli copter will very easy fly compari son stock head interested smooth realistic flight am sure going enjoy Bills head mods 86 Model Aviation HOWTO DROP HINT THAT YOU WANT RC HELl KIT FOR CHRISTMAS youve good yeer think deserve Radio Controlled Heli copter Kit present dont want ask outright res whet Fold paper thIs ad showIng S clip ad end leave lying breakfast table wifes sewing dress ing table e front TV set kids wiil see THEYLL GET THE HINT THEYLL KNOW WHERE TO GO FOR THE KIT YOU WANT us experts Radio Con trolled Helicopter Model Kits because stock build know sell anyone else Latest Royal Tach-Tron model RC Helicopters collective pitch systems Provides electronically governed Main Rotor RPM thru control throttle automatic control collective pitch Flown extensively over past year helicopter pllotsHighly recommended Wtonly 2 ounces Installation instructions #5268 Royal Tach-Tron System $6495 Lsenct Si br new helicopter catalog & parts list write ModeiHe opesD son SC MODELER HOBBY SHOP Hells Planes Cars Boats Radios Parts RC Hobbyists 1999 Larkin Avenue Elgin Illinois 60120 Dept 132312-697-37374 product review product review product review Midwest Hawk Hawk almost readyto-f lv kit AC Soaring need ironon covering material flying surfaces primer color paint fuselage Man ufacturer states toughest materials used provide airplane almost destructible Shipped its own molded foam case can used going flying field Replacement parts available Midwest Products Co Inc 400 South Indi ans St Hobart IN 46342 have modified several heads described Model Builder much easier gives almost same results will have decide cup tea Jet Ranger Setup people have com mented about smooth effortless Jet Ranger flies Recently doing some flight demonstrations man taking bets gyro dont fly gyro Jet Ranger set up per manual set up Assuming have good Schnuerle-ported engine will deliver plenty reserve power will idle well lets go through step step full throttle trim engine should start full low trim should shut off full throttle trim half collective adjust swashplate risers mixers seesaw center neutral position point collective bellcranks servo plate should vertical will have equal travel up down full throttle trim half collective stick carburetor opening should pen tail-rotor mix bar should set collective-servo wheel will give minimal mix possible tailrotor control rod takeoff ball mix lever should far forwards tailrotor servo possible still its slot pick-off point tail-rotor servo should far out its wheel possible pushrod tail-rotor bellcrank should innermost hole tail-rotor blades should drilled 1/4 closer end order increase size tail-rotor disc Now adjust pitch main blades about 4/2 degrees half-collective stick Adjust tail-rotor pitch high trim low collective stick about 0 degrees Now start up run up blade speed Adjust main-blade pitch lift-off have between 5100 5300 rpm tail rotor tweak needle valve get blade speed rather reduce pitch Mine lifts off 5300 rpm Kraft engine K&B 500 fuel still four-cy cling Youman head mods set up described properly trimmed machine should fly hands offeven stiff wind World-Wide RC Helicopter Symposium Tentative plans being made bring together RC manufacturers world Orlando FL December 28-30 1977 along factory demon stration teams Also radio engine fuel other related product manufacturers will day booth displays day factory flight demonstrations day set aside fly get help whatever wish will space display own work art new ideas special awards best show Next months column will have final details Plan attend youre flying youre trying hard enough Walt Schoonard 2080 Sharon Rd Winter Park FL 32789 LSF Tournament/Pruss continued page 30 scale participation level Vs competed three four finished top five respective categories. protest filed. comparing weather scores its safe say bigger planes fly better. scheduled rounds 7 flown sites e Alas ka missed third place point. 42 en tered best technical achievement forms will heard about later date. 41 Junior/Seniors competed. first year manufacturers solicited supporta thanks past sponsorship. ues membership over 2500 mark tournament time500 outside USA. gue gains financial support its membership through con tributions sent PDV forms through tournaments bership free can obtained writing League Silent Flight Box 39068 Chi cago IL 60639 December 1977 87