Helicopters THIS COLUMN will what promised past month has very hectic have able complete testing tail-rotor mix set-up have working satisfac tion So rather confuse Ill some testing fill couple things last months column did make too clear First did include draw ing collective cam have following articles set up machine apologize delay size cam will depend throw servo would suggest point select fastest smoothest powerful servo collective position servo must drive carburetor collective bellcrank other mechanics go head would also suggest use nylon devices wherever possible cam bellcrank carburetor connections re duce drag much possible want servo operate very fine incre ments drag will greatly hinder should make cam 1/16 phe Wall Schoonard nolic printed circuit board Draw out board drill large center hole before cutting cam out hole servo-wheel retaining screw its size will depend screw size should somewhat larger screw hinder screws function two holes hold cam servo wheel should drilled fit servo wheel hole pushrod collective bellcrank will drilled later setup will dictate following procedure setting up cam should followed closely Make pushrod go carburetor collective servo Fasten end nylon clevis carburetor align other end servo wheel low throttle half-trim carburetor slightly open half throttle stick posi tion carburetor should open 5/s remaining /8 opening should come last half stick movement set up should result following form Half trim low throttle start engine full trim engage clutch half throttle stick 5/8 carburetor open full throttle full carburetor open Helmut Holders first copter interesting scratch-built Webra 60 carries its 12-1/2 lb weight Photograph Phil Edwards completed now will work out collective setting Put collective bellcrank its lowest position notice bearing hits fan shroud Mark point using Dremel tool burr cut hole shroud crank bearing will go freely hole thus permitting far lower positioning crank Now position collective servo neutral trim high collective bellcrank mixers main rotor-shaft slider horizon tal Make pushrod nylon clevis attach lowest hole col lective bellcrankthe other end should go cam positioning cam servo-wheel will now have done trial error Using Hot Stuff equivalent hold cam once located will permit make several positions cam fore permanently attached cam should permit servo travel end end binding either end setup will give negative pitch low throttle ee positive half throttle continued page 84 Y SERVO MOUNT SCREWS IIIGHCOLLECTIVE March 1977 23 PUSH-RODS DRAWINGS BY TIM SCHOONARO SERVO K jQI NUT AND BOLTS I e S 4 LIFTOFF POSITION SERVO-MOUNT LOW-COLLECTIVE ~OPE1 MORE w/AfiWflid7d o ofl same power YELLOW jaster e pttCPROPELLER JB ade e\\e e~Ta o O9 5354 e S 00 O 2 PosIer 3 544 6364354 8-6 ss 9-6 106 1 3 Blade Tractor 53 54 63 6-4 504 3 Blade Pusiw 63 CL Aerobatics/Paul continued page 40 lighter efficient well cidentally 35-size wing cut out cored weighs about /t ounce Despite concern weight two biggest factors plus side foam wings fact usually very straight possess constant airfoil points two factors should enough make plane fly well Both Bob Hunt CSC Arnold Stott Foam Flite have developed pop corn wings craftsmanship outstanding results being seen standings contests Na tionals more foam wings show up winners Nationals Format Change PAMPA Pres ident Keith Trostle currently reviewing several proposals change format precision aerobatics event Na tionals 1977 three items have received lot talk well right griping must about stunt Nats need open stunt con testants have official flights qualifications processin past sev eral years contestants have able put up flight whole stunt event Nats 2 National Champion should decided official flight 3 Walker Cup flyoff could representative award slightly altered program flyoffs adopted would call 5 10 finalists participate including Junior Senior champions contestant performing three official flights 1977 Nats may see two days open stunt qualifications two official flights day Qualifiers would chosen adding best score day After picking 15 20 qualifiers semi finals Walker Cup Eliminations top 5 10 would advance Walker Cup flyoff Comments should sent Keith Trostle 10900 Phillips Dr Upper Marlboro MD 20870 Special Stunt Products several specialized products stunt 5 3 54304 6364354 747678504 848688654 949-697q O4106854 RC 124 125126150 ORISH BROS ST JOHN ND ANA 46373 usually local hobby dealers shelves few Muffler produced Bob Paul no kin writer used success fully Bob Gieseke Bill Werwage picture muffler appeared December 1976 issue Model Aviation page 25 Weighing competitive ounce muffler hand-built Bob engine has no parts can come loose fall off engine Bob can build use muffler pressure muffler has minimum back pressure bulky looking airplane Cost $2150 including postage handling Bob also now offering engine work popular stunt engines Contact him 4428 W 49th St Cleveland OH 44144 Leadout Cable Rolland Bob Mc Donald report have sale 040-diameter nylon-coated steel leadout cable l5 per foot extremely tough cable will fray wear bellcrank Contact 28746 Westfield Livonia MI 48150 Engines Engine Rework Carlos Aloise famous championship carrier planes stunt now offer ing stunt version Cox TD 049 051 special 58-oz 40 stunt engine special 92-oz 60 stunt engine engines especially made up Carlos states easy starting very powerful have low fuel consump tion also states will rework commercial engine spec ifications Send catalog services offered 2314 Loy Lane Los Angeles CA 90041 telephone 213 254-9795 Bisco Bender Harry Higley also carrier fame manufacturing very use ful tubing bender can used shape hard brass tubing well soft tube Can used fuel tank pickups vents needle valve extensions other miscellaneous plumbing Price $125 address 433 Arquilla Dr Glenwood IL 60425 information about PAMPA anything else contact writer Wynn Paul 1640 Maywick Dr Lex ington KY 40504 RC Helicopters/Schoonard continued page 23 much pitch full throttle wish Now making die final adjustments what should take place half throttle full trim 5A carburetor opening full-blade speed should occur point should have ee posi tive pitch As servo advances last 3/ carburetor opening should come collective added As pitch increases carburetor will compensate increased torque brought increased pitch Also pitch decreased torque de creases engine speed will automatical ly compensate end result near con stant-blade speed negative pitch available will permit rapid descents constant blade speed will permit quick stops adjusting can accom plished running engine may have break cam loose several times reposition order get proper throws sure have want drill two outer retaining holes through cam servo wheel use either small screws bolts attach permanently Make sure screws touch servo case Now am sure sounds very com plicated possibly confusing suggest read several times carefully proceed After hard engi neering developing has done now have copy end results will very re warding well worth time Once get done truth will flying Super-Baby should sit very firmly ground full blade speed collective added should come up very sharply descents landing should precise well defined last thing order use clevis servo-wheel will have cut away area next clevis low throttle will hindered would like mention very good up coming helicopter contest April 23 24 1977 Second Annual Atlanta RC Helicopter Championships hosted Cobb County RC Club plan Saturday night April 23 buffet dinner 730 pm Holiday Inn Marrietta Georgia Proposed AMA Rules Novice Intermediate Expert plus begin ners event qualify have start engine Trophies third place First place Novice 1977 Kraft 5channel radio hotel reservations further information contact Dan Daugherty 3761 Macedonia Road Pow der Springs Georgia 30073Phone 404 943-6776 Good luck youre flying youre trying Walt Schoonard 2080 Sharon Rd. Winter Park FL 32789 84 Model Aviation
Edition: Model Aviation - 1977/03
Page Numbers: 23, 84
Helicopters THIS COLUMN will what promised past month has very hectic have able complete testing tail-rotor mix set-up have working satisfac tion So rather confuse Ill some testing fill couple things last months column did make too clear First did include draw ing collective cam have following articles set up machine apologize delay size cam will depend throw servo would suggest point select fastest smoothest powerful servo collective position servo must drive carburetor collective bellcrank other mechanics go head would also suggest use nylon devices wherever possible cam bellcrank carburetor connections re duce drag much possible want servo operate very fine incre ments drag will greatly hinder should make cam 1/16 phe Wall Schoonard nolic printed circuit board Draw out board drill large center hole before cutting cam out hole servo-wheel retaining screw its size will depend screw size should somewhat larger screw hinder screws function two holes hold cam servo wheel should drilled fit servo wheel hole pushrod collective bellcrank will drilled later setup will dictate following procedure setting up cam should followed closely Make pushrod go carburetor collective servo Fasten end nylon clevis carburetor align other end servo wheel low throttle half-trim carburetor slightly open half throttle stick posi tion carburetor should open 5/s remaining /8 opening should come last half stick movement set up should result following form Half trim low throttle start engine full trim engage clutch half throttle stick 5/8 carburetor open full throttle full carburetor open Helmut Holders first copter interesting scratch-built Webra 60 carries its 12-1/2 lb weight Photograph Phil Edwards completed now will work out collective setting Put collective bellcrank its lowest position notice bearing hits fan shroud Mark point using Dremel tool burr cut hole shroud crank bearing will go freely hole thus permitting far lower positioning crank Now position collective servo neutral trim high collective bellcrank mixers main rotor-shaft slider horizon tal Make pushrod nylon clevis attach lowest hole col lective bellcrankthe other end should go cam positioning cam servo-wheel will now have done trial error Using Hot Stuff equivalent hold cam once located will permit make several positions cam fore permanently attached cam should permit servo travel end end binding either end setup will give negative pitch low throttle ee positive half throttle continued page 84 Y SERVO MOUNT SCREWS IIIGHCOLLECTIVE March 1977 23 PUSH-RODS DRAWINGS BY TIM SCHOONARO SERVO K jQI NUT AND BOLTS I e S 4 LIFTOFF POSITION SERVO-MOUNT LOW-COLLECTIVE ~OPE1 MORE w/AfiWflid7d o ofl same power YELLOW jaster e pttCPROPELLER JB ade e\\e e~Ta o O9 5354 e S 00 O 2 PosIer 3 544 6364354 8-6 ss 9-6 106 1 3 Blade Tractor 53 54 63 6-4 504 3 Blade Pusiw 63 CL Aerobatics/Paul continued page 40 lighter efficient well cidentally 35-size wing cut out cored weighs about /t ounce Despite concern weight two biggest factors plus side foam wings fact usually very straight possess constant airfoil points two factors should enough make plane fly well Both Bob Hunt CSC Arnold Stott Foam Flite have developed pop corn wings craftsmanship outstanding results being seen standings contests Na tionals more foam wings show up winners Nationals Format Change PAMPA Pres ident Keith Trostle currently reviewing several proposals change format precision aerobatics event Na tionals 1977 three items have received lot talk well right griping must about stunt Nats need open stunt con testants have official flights qualifications processin past sev eral years contestants have able put up flight whole stunt event Nats 2 National Champion should decided official flight 3 Walker Cup flyoff could representative award slightly altered program flyoffs adopted would call 5 10 finalists participate including Junior Senior champions contestant performing three official flights 1977 Nats may see two days open stunt qualifications two official flights day Qualifiers would chosen adding best score day After picking 15 20 qualifiers semi finals Walker Cup Eliminations top 5 10 would advance Walker Cup flyoff Comments should sent Keith Trostle 10900 Phillips Dr Upper Marlboro MD 20870 Special Stunt Products several specialized products stunt 5 3 54304 6364354 747678504 848688654 949-697q O4106854 RC 124 125126150 ORISH BROS ST JOHN ND ANA 46373 usually local hobby dealers shelves few Muffler produced Bob Paul no kin writer used success fully Bob Gieseke Bill Werwage picture muffler appeared December 1976 issue Model Aviation page 25 Weighing competitive ounce muffler hand-built Bob engine has no parts can come loose fall off engine Bob can build use muffler pressure muffler has minimum back pressure bulky looking airplane Cost $2150 including postage handling Bob also now offering engine work popular stunt engines Contact him 4428 W 49th St Cleveland OH 44144 Leadout Cable Rolland Bob Mc Donald report have sale 040-diameter nylon-coated steel leadout cable l5 per foot extremely tough cable will fray wear bellcrank Contact 28746 Westfield Livonia MI 48150 Engines Engine Rework Carlos Aloise famous championship carrier planes stunt now offer ing stunt version Cox TD 049 051 special 58-oz 40 stunt engine special 92-oz 60 stunt engine engines especially made up Carlos states easy starting very powerful have low fuel consump tion also states will rework commercial engine spec ifications Send catalog services offered 2314 Loy Lane Los Angeles CA 90041 telephone 213 254-9795 Bisco Bender Harry Higley also carrier fame manufacturing very use ful tubing bender can used shape hard brass tubing well soft tube Can used fuel tank pickups vents needle valve extensions other miscellaneous plumbing Price $125 address 433 Arquilla Dr Glenwood IL 60425 information about PAMPA anything else contact writer Wynn Paul 1640 Maywick Dr Lex ington KY 40504 RC Helicopters/Schoonard continued page 23 much pitch full throttle wish Now making die final adjustments what should take place half throttle full trim 5A carburetor opening full-blade speed should occur point should have ee posi tive pitch As servo advances last 3/ carburetor opening should come collective added As pitch increases carburetor will compensate increased torque brought increased pitch Also pitch decreased torque de creases engine speed will automatical ly compensate end result near con stant-blade speed negative pitch available will permit rapid descents constant blade speed will permit quick stops adjusting can accom plished running engine may have break cam loose several times reposition order get proper throws sure have want drill two outer retaining holes through cam servo wheel use either small screws bolts attach permanently Make sure screws touch servo case Now am sure sounds very com plicated possibly confusing suggest read several times carefully proceed After hard engi neering developing has done now have copy end results will very re warding well worth time Once get done truth will flying Super-Baby should sit very firmly ground full blade speed collective added should come up very sharply descents landing should precise well defined last thing order use clevis servo-wheel will have cut away area next clevis low throttle will hindered would like mention very good up coming helicopter contest April 23 24 1977 Second Annual Atlanta RC Helicopter Championships hosted Cobb County RC Club plan Saturday night April 23 buffet dinner 730 pm Holiday Inn Marrietta Georgia Proposed AMA Rules Novice Intermediate Expert plus begin ners event qualify have start engine Trophies third place First place Novice 1977 Kraft 5channel radio hotel reservations further information contact Dan Daugherty 3761 Macedonia Road Pow der Springs Georgia 30073Phone 404 943-6776 Good luck youre flying youre trying Walt Schoonard 2080 Sharon Rd. Winter Park FL 32789 84 Model Aviation