Control Line. Scale Mike Gretz HIGH THROTTLE ELEVATOR NEUTRAL INEVITABLY expert comes event tends take granted things may puzzling troublesome some new comers majority last months columns devotes attention some basics usually overlooked Some experts may get little bored know correspondence guys out have pretty basic questions standing between first CL Scale model As mentioned last month throttleequipped engine absolute necessity winning CL Scale competition throt tle allows perform several optional maneuvers like taxi touch go would otherwise impos sible best very unrealistic also enables perform basic required maneuvers takeoff cruising flight landing much greater realism finesse common method operating throttle-equipped engine CL Scale model third control line addi tion normal up down elevator lines Over years ingenious modelers have designed built own 3-line throttle systems mixed results Some Ive seen basic should say crude simply providing either full high full low throttle successive pull third control line Another third line spring loaded return low throttle whenever tension released line can use own imagina tion easily realize neither methods very effective step towards realism flight What needed precise proportional control entire throttle range Sturdi-Built Mfg Co G-S Products Corp both manufacture market com plete 3-line throttle systems designed just Ive used both would hard beat either welldesigned systems dependability precision anything homemade differences manufacture tween two brands actually very similar theory operation Sturdi-Built product known i Roberts Flight Control has pro duced years probably has used CL Scale Navy Carrier models other methods combined first years reliable system market G-S Products 3-line system came out about five six years ago has acknowledged Scale TTLE PUSH ROD BELICRAN K J-ROBERTS/G-S PRODUCTS 3-LINE THROTTLE SYSTEM CONTROL HANDLE LOW THROTTLE ELEVATOR NEUTRAL Drawing No 1 Interaction matching belicrank control handle maintains constant equal tension three control lines times Elevator position affected throttle setting Upright Belicrank Bolt top plywood noont ing plate Best access bellcranh compart went frow top ot model Ecamples High shoolder wing models belicrook moonting foselage Low wing models bellcrank n top ot wing UPRIGHT BELLCRANK Cz Inoerted Bellcrash- Bolt bottom plywood moont log plate Best access bellcrash compart ment bottom model Poamples Low wing inoodels bellcrank moanting teselage High shoolder wing models bellcrank moont ing bottom wing INVERTED BELLCRANK Drawing No 2 Style G-S/J-Robertsbellcrank required depends upon sublect aircraft con trol system location Above examples assume model built wing removable Carrier experts improved version older i-Roberts system heavier duty smoother operating has 1/3 throttle pushrod movement certainly wouldnt hesitate recommend either brand since have used both equally satisfactory results Both trust worthy precision products make what could tough job CL Scale model very simple G-S i-Roberts system con sists special 3-line bellcrank matching 3-line control handle two basic components sold separately will function properly other cant mix different brands either control lines required three equal diameter length exact sizes depend size weight model Refer AMA Rule Book Sect 49 CL Precision Scale find size need Drawing #1 illustrates high Continued page 99 February 1979 37 Ace R/C proud announce new member family servos popular Digital Commander line radio equipment kits Bantam Midget brother Bantam servo has respected name servos years Bantam Midget considerably smaller lighter boasts same torque gear strength its big brother bit speed Notice extremely low profile--important interfacing elevator rudder servos aileron servo linkages Reread above paragraph consider fact Midget offers servo micro-miniature category also has power strength 60 powered pattern ships Truly universal servo Signetics 544 IC external driver transistors quality plastic conductive element pot other components make combination has become synonymous Ace R/C Digital Commander servos Servos have Competition Grade performance economical price tag Bantam Midget will work modern positive pulse system negative pulse systems ProLine etc pulse inverter 14G18--$2 required servo rotary wheel extended arm adjustable arm furnished No connectors furnished servo kits flite packs complete systems available Midget option please write details Weight 85 oz 24 grams Thrust 20 oz Transit Time Under 5 sec 900 BREAKTHROUGH IN SERVOS 14G20R--Bantam Midget Kit $2695 Please sand complete catalog Enclosed Si 00 refunded NAME first order Add $50 lot clam mail return add $100 haodlog oo other ADDRESS len cif 14G2ORC--Bantam Midget Assembled $3195 [ACE Em] STATE zrBOX SuE HIGGINSVILLE MO icularly susceptible uneven coning angle due bending blade holders achieve pitch angles After setting blade pitch per manual check static level blade may find rotor blade tip appears higher other though gimbal assembly teeter level may check coning angle quickly using transmitter anten na Set helicopter level surface transmitter placed antenna can adjusted just barely touch center rotor blade tip rotate rotor opposite blade brought same position level differs adjust whichever blade necessary achieve proper con ing angle Once proper coning angle con firmed quickly check again lead lag blade pitch readjust neces sary Finally set tail rotor blade pitch eyeball method set T/R pitch approximately twice M/R pitch setting beginning setting will also fine tuned time run-up did mention throttle set-up because instructions detail set up can differ between various fixed pitch collective machines will say should sure throttle free move full throw servo generally half stick transmitter should show throttle barrel half open Mixing throttle collective pitch should per instructions Now balance machine slightly nose heavy balanced center gravity shown plans CG usually directly through slightly forward center line MIR shaft Next month well start engine see well static set-ups work following articles Ill try ex plain some terms used describing RC hellcopter few basics helicopter flight move flying field some hints set-up hints may seem out place sure wanted start flying im mediately Before close month Ill pass word Horace Hagen planning meeting RC Helicopter enthusiasts years Toledo show Dates times will follow Another short topic Charlie Sjobeck Vermont invites prospective RC Helicopter pilots area contact him assistance address Charles F Sjobeck Happy Hollow Road South Royalton VT 05068 Charlie came North Carolina Helicopter Associa tion Championships won Sports man Class flying Hell-Boy Funny state championships won out-of-state contestants Bill Youmans won Walt Schoonard placed third both flying Hell-Boys both out state What happened home court advantage speaking Hell-Boys Ive just finished machine smooth responsive stable joy fly great year flying helicop tersjoin us See next month Dave Chesney Ri 9 Box 62 IA Greensboro NC 27409 CL Scale/Gretz continued page 37 throttle engine position obtained movement handles throttle lever forward As trigger goes forward middle throttle control line being drawn towards control handle other two up down lines being extended away movement matching bellcrank pulling updown lines extending throttle line towards handle throttle pushrod movement created bellcrank interaction up-down lines throttle line Thus equal tension pull lines flight always maintained three lines regardless throttle position Both companies have two basic types bellcranks referred Upright Inverted Drawing #2 shows February 1979 99 Bs /ktz4ut IW4t Size Height--1125 Length--143 Width--O5 style needed particular model de pends general arrangement subject aircraft layout models control system An Upright bellcrank intended bolting top plywood mounting plate model best access bellcrank compartment top model high- shoulder-wing design bellcrank mounted fuselage low-wing design bellcrank mounted top wing An verted bellcrank bolted bottom plywood mounting plate best access bellcrank com partment bottom model low-wing design bellcrank mounted fuselage high- shoulder-wing design bellcrank bottom wing Mount bellcrank least thick 5-ply plywood according manufac turers instructions Pay particular atten tion part about having slot bellcrank mounting plate 90 ele vator pushrod eliminates undesirable elevator movement flight engine throttle setting changed usually lubri cate bellcranks moving parts graphite spray available small tube hardware stores Lastly control system installation thoroughly check double-check abso lutely no binding undue friction systems operation must work perfectly free best performance stiff balky control system almost always indicates im proper installation can cause special handling problems during low line-tension maneuvers like takeoff landing taxi Give yourself model chance perform up full potential making sure control system works easily smoothly throughout its entire range Political protest model airplane con test Sounds ridiculous doesnt thats what happened last summer As probably know 1978 RC & CL Scale World Championships held con junction 1978 Control Line World Championships Stunt Speed Team Race common site Woodvale England sounded great parties countries Russia Yugo slavia Bulgaria Czechoslovakia Po land dropped out of events political protest against entry South Africa CL Team Race CL Scale WC event fatally affected FAI rules require minimum five participat ing countries qualify event ficial World Championshipsother wise simply International con test So withdrawal Russian Polish teams CL Scale forced its can cellation World Championships event last minute news reached AMA days fore US team members sched uled depart England As travel plans motion models packed team spirit high decided send over CL Scale team members Ray Smith Dan Osdoba Roland Baltes still possible hope International level competition would held never did materialize cant help feel boy cott somewhat childish its concep tion ineffectiveness water under bridge point Cana dians expected put bid host 1980 Scale World Championships Ottawa sincerely hope will tempt organize CL Scale WC event part festivities Under circum stances seems cancella tion CL Scale event Woodvale year product Scale events being tied Control Line gen eral WC reflection current interest FAI CL Scale FAI Canadian organizers should remember CL Scale event well attended strongly contested previous Scale World Championshipsincluding 1974 Lakehurst New Jersey Mike Gretz Box 162 Montezuma IA 50171 CL Racing/Lee continued page 39 sound just like Well let copy last rule assumed usual sportsman ship conduct Northwest competitors will prevail running event event director may disqualify entrant feels competing within intent spirit event Sound good Heres part note Mike added wrote newsletter Note unique rule #8 above 77 NW Regionals Racing Events Director Sport Race entrants threatened disqualification appeared competing too seriously Further highly suggested smile lot show everybody what fun having Im serious Again group racing fliers poking what ails us compete-at-any-cost syndrome seems make com petitors forget because want have fun Fast Goodyears have pretty good year Goodyear year competing Scale Race course flying has done District 8 did get chance compete Winston Salem Bill Pardues AAAA contest lucky enough win not-great time 606 However times get better season wore Turned 600 flat contest New Orleans nearly wrecked good plane Ft Worth solder joint con trol system come loose causing pancake some repairable damage didnt fly Nats since CL Category Director later wentto South western Control Line Championships Dallas Labor Day turned real good 542 Competition Dallas very good especially Goodyear Bud Doug Harris Kerry Turner Mike Wheeler Jim Ong attendance having placed top five six Open Senior Goodyear Lake Charles 100 Model Aviation -U C Plans Ae lUeded TO Inspire B18s 5i%SI 14o, 810 Bo,6$20 108 Boe 8-17G En, $48 5 100 845- 77 Boe 817 Bomb $30 58 Boeog 88 Benob$13SI 8oe B-17G Fort$25 54 Vgl Corair 025$2099 N 81k Widom P5$69 83 C SkyteoPIe P5F1 $16 48 N 81k Widon P51 $26 48$ Koydel P017 814 81 DPI MoW Bomb $36 * 60 Dog 058 CBS 515 41 88 Moq Bonb $18 42 Boeorg P26A $18 9$ lad Boob 114 $49 45 Boeag P482 P12 $14 50 Hodon Bomber $18 * 47 Cobook P1 IC2 $18 55 NA MiteIeI 825 $22 62 Coo Heek P60 $39 50 Monk 826 Boob 25 ....a.4 47 Cart 80.k P68 527 65 Marlin 826 Bomb $42 Ai~47 Cart C Helldioe $18 68 Sank JU 885 8o, $18 57 Ca 01 E P0180 $20 51 Jonk JU 88S Boo $13 ot SOSCi Sea 515 46 Jon Stalno JU$7 $22 4$ GlorGlodioto g 10E7$17 04$12 93 G8 Beonco 988 17 46 BnaloIMIC 81 $1454 Parhild P01818 43 Neo II EooTie $14 54 lfir$17 42OH2$oo Boo 10 $14 PBICB INCLUDE PSTERNS 501811 Cork DjA1 16 .SSVnkerConBo $18 S.*.45V,ber PB12B&C $14 SEND Si Complete Potorial Catalog •..sAddlO% ALL ORDERS Nicknamed Whistling Death Japanese foes F4U Corsair scored incredible 11to-i kill/lou average during World War II also Americas first 400mph-plus fighter Dick Scrogin built 36 span model version Sterling kit powered itwitha Fox 35
Edition: Model Aviation - 1979/02
Page Numbers: 37, 99, 100
Control Line. Scale Mike Gretz HIGH THROTTLE ELEVATOR NEUTRAL INEVITABLY expert comes event tends take granted things may puzzling troublesome some new comers majority last months columns devotes attention some basics usually overlooked Some experts may get little bored know correspondence guys out have pretty basic questions standing between first CL Scale model As mentioned last month throttleequipped engine absolute necessity winning CL Scale competition throt tle allows perform several optional maneuvers like taxi touch go would otherwise impos sible best very unrealistic also enables perform basic required maneuvers takeoff cruising flight landing much greater realism finesse common method operating throttle-equipped engine CL Scale model third control line addi tion normal up down elevator lines Over years ingenious modelers have designed built own 3-line throttle systems mixed results Some Ive seen basic should say crude simply providing either full high full low throttle successive pull third control line Another third line spring loaded return low throttle whenever tension released line can use own imagina tion easily realize neither methods very effective step towards realism flight What needed precise proportional control entire throttle range Sturdi-Built Mfg Co G-S Products Corp both manufacture market com plete 3-line throttle systems designed just Ive used both would hard beat either welldesigned systems dependability precision anything homemade differences manufacture tween two brands actually very similar theory operation Sturdi-Built product known i Roberts Flight Control has pro duced years probably has used CL Scale Navy Carrier models other methods combined first years reliable system market G-S Products 3-line system came out about five six years ago has acknowledged Scale TTLE PUSH ROD BELICRAN K J-ROBERTS/G-S PRODUCTS 3-LINE THROTTLE SYSTEM CONTROL HANDLE LOW THROTTLE ELEVATOR NEUTRAL Drawing No 1 Interaction matching belicrank control handle maintains constant equal tension three control lines times Elevator position affected throttle setting Upright Belicrank Bolt top plywood noont ing plate Best access bellcranh compart went frow top ot model Ecamples High shoolder wing models belicrook moonting foselage Low wing models bellcrank n top ot wing UPRIGHT BELLCRANK Cz Inoerted Bellcrash- Bolt bottom plywood moont log plate Best access bellcrash compart ment bottom model Poamples Low wing inoodels bellcrank moanting teselage High shoolder wing models bellcrank moont ing bottom wing INVERTED BELLCRANK Drawing No 2 Style G-S/J-Robertsbellcrank required depends upon sublect aircraft con trol system location Above examples assume model built wing removable Carrier experts improved version older i-Roberts system heavier duty smoother operating has 1/3 throttle pushrod movement certainly wouldnt hesitate recommend either brand since have used both equally satisfactory results Both trust worthy precision products make what could tough job CL Scale model very simple G-S i-Roberts system con sists special 3-line bellcrank matching 3-line control handle two basic components sold separately will function properly other cant mix different brands either control lines required three equal diameter length exact sizes depend size weight model Refer AMA Rule Book Sect 49 CL Precision Scale find size need Drawing #1 illustrates high Continued page 99 February 1979 37 Ace R/C proud announce new member family servos popular Digital Commander line radio equipment kits Bantam Midget brother Bantam servo has respected name servos years Bantam Midget considerably smaller lighter boasts same torque gear strength its big brother bit speed Notice extremely low profile--important interfacing elevator rudder servos aileron servo linkages Reread above paragraph consider fact Midget offers servo micro-miniature category also has power strength 60 powered pattern ships Truly universal servo Signetics 544 IC external driver transistors quality plastic conductive element pot other components make combination has become synonymous Ace R/C Digital Commander servos Servos have Competition Grade performance economical price tag Bantam Midget will work modern positive pulse system negative pulse systems ProLine etc pulse inverter 14G18--$2 required servo rotary wheel extended arm adjustable arm furnished No connectors furnished servo kits flite packs complete systems available Midget option please write details Weight 85 oz 24 grams Thrust 20 oz Transit Time Under 5 sec 900 BREAKTHROUGH IN SERVOS 14G20R--Bantam Midget Kit $2695 Please sand complete catalog Enclosed Si 00 refunded NAME first order Add $50 lot clam mail return add $100 haodlog oo other ADDRESS len cif 14G2ORC--Bantam Midget Assembled $3195 [ACE Em] STATE zrBOX SuE HIGGINSVILLE MO icularly susceptible uneven coning angle due bending blade holders achieve pitch angles After setting blade pitch per manual check static level blade may find rotor blade tip appears higher other though gimbal assembly teeter level may check coning angle quickly using transmitter anten na Set helicopter level surface transmitter placed antenna can adjusted just barely touch center rotor blade tip rotate rotor opposite blade brought same position level differs adjust whichever blade necessary achieve proper con ing angle Once proper coning angle con firmed quickly check again lead lag blade pitch readjust neces sary Finally set tail rotor blade pitch eyeball method set T/R pitch approximately twice M/R pitch setting beginning setting will also fine tuned time run-up did mention throttle set-up because instructions detail set up can differ between various fixed pitch collective machines will say should sure throttle free move full throw servo generally half stick transmitter should show throttle barrel half open Mixing throttle collective pitch should per instructions Now balance machine slightly nose heavy balanced center gravity shown plans CG usually directly through slightly forward center line MIR shaft Next month well start engine see well static set-ups work following articles Ill try ex plain some terms used describing RC hellcopter few basics helicopter flight move flying field some hints set-up hints may seem out place sure wanted start flying im mediately Before close month Ill pass word Horace Hagen planning meeting RC Helicopter enthusiasts years Toledo show Dates times will follow Another short topic Charlie Sjobeck Vermont invites prospective RC Helicopter pilots area contact him assistance address Charles F Sjobeck Happy Hollow Road South Royalton VT 05068 Charlie came North Carolina Helicopter Associa tion Championships won Sports man Class flying Hell-Boy Funny state championships won out-of-state contestants Bill Youmans won Walt Schoonard placed third both flying Hell-Boys both out state What happened home court advantage speaking Hell-Boys Ive just finished machine smooth responsive stable joy fly great year flying helicop tersjoin us See next month Dave Chesney Ri 9 Box 62 IA Greensboro NC 27409 CL Scale/Gretz continued page 37 throttle engine position obtained movement handles throttle lever forward As trigger goes forward middle throttle control line being drawn towards control handle other two up down lines being extended away movement matching bellcrank pulling updown lines extending throttle line towards handle throttle pushrod movement created bellcrank interaction up-down lines throttle line Thus equal tension pull lines flight always maintained three lines regardless throttle position Both companies have two basic types bellcranks referred Upright Inverted Drawing #2 shows February 1979 99 Bs /ktz4ut IW4t Size Height--1125 Length--143 Width--O5 style needed particular model de pends general arrangement subject aircraft layout models control system An Upright bellcrank intended bolting top plywood mounting plate model best access bellcrank compartment top model high- shoulder-wing design bellcrank mounted fuselage low-wing design bellcrank mounted top wing An verted bellcrank bolted bottom plywood mounting plate best access bellcrank com partment bottom model low-wing design bellcrank mounted fuselage high- shoulder-wing design bellcrank bottom wing Mount bellcrank least thick 5-ply plywood according manufac turers instructions Pay particular atten tion part about having slot bellcrank mounting plate 90 ele vator pushrod eliminates undesirable elevator movement flight engine throttle setting changed usually lubri cate bellcranks moving parts graphite spray available small tube hardware stores Lastly control system installation thoroughly check double-check abso lutely no binding undue friction systems operation must work perfectly free best performance stiff balky control system almost always indicates im proper installation can cause special handling problems during low line-tension maneuvers like takeoff landing taxi Give yourself model chance perform up full potential making sure control system works easily smoothly throughout its entire range Political protest model airplane con test Sounds ridiculous doesnt thats what happened last summer As probably know 1978 RC & CL Scale World Championships held con junction 1978 Control Line World Championships Stunt Speed Team Race common site Woodvale England sounded great parties countries Russia Yugo slavia Bulgaria Czechoslovakia Po land dropped out of events political protest against entry South Africa CL Team Race CL Scale WC event fatally affected FAI rules require minimum five participat ing countries qualify event ficial World Championshipsother wise simply International con test So withdrawal Russian Polish teams CL Scale forced its can cellation World Championships event last minute news reached AMA days fore US team members sched uled depart England As travel plans motion models packed team spirit high decided send over CL Scale team members Ray Smith Dan Osdoba Roland Baltes still possible hope International level competition would held never did materialize cant help feel boy cott somewhat childish its concep tion ineffectiveness water under bridge point Cana dians expected put bid host 1980 Scale World Championships Ottawa sincerely hope will tempt organize CL Scale WC event part festivities Under circum stances seems cancella tion CL Scale event Woodvale year product Scale events being tied Control Line gen eral WC reflection current interest FAI CL Scale FAI Canadian organizers should remember CL Scale event well attended strongly contested previous Scale World Championshipsincluding 1974 Lakehurst New Jersey Mike Gretz Box 162 Montezuma IA 50171 CL Racing/Lee continued page 39 sound just like Well let copy last rule assumed usual sportsman ship conduct Northwest competitors will prevail running event event director may disqualify entrant feels competing within intent spirit event Sound good Heres part note Mike added wrote newsletter Note unique rule #8 above 77 NW Regionals Racing Events Director Sport Race entrants threatened disqualification appeared competing too seriously Further highly suggested smile lot show everybody what fun having Im serious Again group racing fliers poking what ails us compete-at-any-cost syndrome seems make com petitors forget because want have fun Fast Goodyears have pretty good year Goodyear year competing Scale Race course flying has done District 8 did get chance compete Winston Salem Bill Pardues AAAA contest lucky enough win not-great time 606 However times get better season wore Turned 600 flat contest New Orleans nearly wrecked good plane Ft Worth solder joint con trol system come loose causing pancake some repairable damage didnt fly Nats since CL Category Director later wentto South western Control Line Championships Dallas Labor Day turned real good 542 Competition Dallas very good especially Goodyear Bud Doug Harris Kerry Turner Mike Wheeler Jim Ong attendance having placed top five six Open Senior Goodyear Lake Charles 100 Model Aviation -U C Plans Ae lUeded TO Inspire B18s 5i%SI 14o, 810 Bo,6$20 108 Boe 8-17G En, $48 5 100 845- 77 Boe 817 Bomb $30 58 Boeog 88 Benob$13SI 8oe B-17G Fort$25 54 Vgl Corair 025$2099 N 81k Widom P5$69 83 C SkyteoPIe P5F1 $16 48 N 81k Widon P51 $26 48$ Koydel P017 814 81 DPI MoW Bomb $36 * 60 Dog 058 CBS 515 41 88 Moq Bonb $18 42 Boeorg P26A $18 9$ lad Boob 114 $49 45 Boeag P482 P12 $14 50 Hodon Bomber $18 * 47 Cobook P1 IC2 $18 55 NA MiteIeI 825 $22 62 Coo Heek P60 $39 50 Monk 826 Boob 25 ....a.4 47 Cart 80.k P68 527 65 Marlin 826 Bomb $42 Ai~47 Cart C Helldioe $18 68 Sank JU 885 8o, $18 57 Ca 01 E P0180 $20 51 Jonk JU 88S Boo $13 ot SOSCi Sea 515 46 Jon Stalno JU$7 $22 4$ GlorGlodioto g 10E7$17 04$12 93 G8 Beonco 988 17 46 BnaloIMIC 81 $1454 Parhild P01818 43 Neo II EooTie $14 54 lfir$17 42OH2$oo Boo 10 $14 PBICB INCLUDE PSTERNS 501811 Cork DjA1 16 .SSVnkerConBo $18 S.*.45V,ber PB12B&C $14 SEND Si Complete Potorial Catalog •..sAddlO% ALL ORDERS Nicknamed Whistling Death Japanese foes F4U Corsair scored incredible 11to-i kill/lou average during World War II also Americas first 400mph-plus fighter Dick Scrogin built 36 span model version Sterling kit powered itwitha Fox 35
Edition: Model Aviation - 1979/02
Page Numbers: 37, 99, 100
Control Line. Scale Mike Gretz HIGH THROTTLE ELEVATOR NEUTRAL INEVITABLY expert comes event tends take granted things may puzzling troublesome some new comers majority last months columns devotes attention some basics usually overlooked Some experts may get little bored know correspondence guys out have pretty basic questions standing between first CL Scale model As mentioned last month throttleequipped engine absolute necessity winning CL Scale competition throt tle allows perform several optional maneuvers like taxi touch go would otherwise impos sible best very unrealistic also enables perform basic required maneuvers takeoff cruising flight landing much greater realism finesse common method operating throttle-equipped engine CL Scale model third control line addi tion normal up down elevator lines Over years ingenious modelers have designed built own 3-line throttle systems mixed results Some Ive seen basic should say crude simply providing either full high full low throttle successive pull third control line Another third line spring loaded return low throttle whenever tension released line can use own imagina tion easily realize neither methods very effective step towards realism flight What needed precise proportional control entire throttle range Sturdi-Built Mfg Co G-S Products Corp both manufacture market com plete 3-line throttle systems designed just Ive used both would hard beat either welldesigned systems dependability precision anything homemade differences manufacture tween two brands actually very similar theory operation Sturdi-Built product known i Roberts Flight Control has pro duced years probably has used CL Scale Navy Carrier models other methods combined first years reliable system market G-S Products 3-line system came out about five six years ago has acknowledged Scale TTLE PUSH ROD BELICRAN K J-ROBERTS/G-S PRODUCTS 3-LINE THROTTLE SYSTEM CONTROL HANDLE LOW THROTTLE ELEVATOR NEUTRAL Drawing No 1 Interaction matching belicrank control handle maintains constant equal tension three control lines times Elevator position affected throttle setting Upright Belicrank Bolt top plywood noont ing plate Best access bellcranh compart went frow top ot model Ecamples High shoolder wing models belicrook moonting foselage Low wing models bellcrank n top ot wing UPRIGHT BELLCRANK Cz Inoerted Bellcrash- Bolt bottom plywood moont log plate Best access bellcrash compart ment bottom model Poamples Low wing inoodels bellcrank moanting teselage High shoolder wing models bellcrank moont ing bottom wing INVERTED BELLCRANK Drawing No 2 Style G-S/J-Robertsbellcrank required depends upon sublect aircraft con trol system location Above examples assume model built wing removable Carrier experts improved version older i-Roberts system heavier duty smoother operating has 1/3 throttle pushrod movement certainly wouldnt hesitate recommend either brand since have used both equally satisfactory results Both trust worthy precision products make what could tough job CL Scale model very simple G-S i-Roberts system con sists special 3-line bellcrank matching 3-line control handle two basic components sold separately will function properly other cant mix different brands either control lines required three equal diameter length exact sizes depend size weight model Refer AMA Rule Book Sect 49 CL Precision Scale find size need Drawing #1 illustrates high Continued page 99 February 1979 37 Ace R/C proud announce new member family servos popular Digital Commander line radio equipment kits Bantam Midget brother Bantam servo has respected name servos years Bantam Midget considerably smaller lighter boasts same torque gear strength its big brother bit speed Notice extremely low profile--important interfacing elevator rudder servos aileron servo linkages Reread above paragraph consider fact Midget offers servo micro-miniature category also has power strength 60 powered pattern ships Truly universal servo Signetics 544 IC external driver transistors quality plastic conductive element pot other components make combination has become synonymous Ace R/C Digital Commander servos Servos have Competition Grade performance economical price tag Bantam Midget will work modern positive pulse system negative pulse systems ProLine etc pulse inverter 14G18--$2 required servo rotary wheel extended arm adjustable arm furnished No connectors furnished servo kits flite packs complete systems available Midget option please write details Weight 85 oz 24 grams Thrust 20 oz Transit Time Under 5 sec 900 BREAKTHROUGH IN SERVOS 14G20R--Bantam Midget Kit $2695 Please sand complete catalog Enclosed Si 00 refunded NAME first order Add $50 lot clam mail return add $100 haodlog oo other ADDRESS len cif 14G2ORC--Bantam Midget Assembled $3195 [ACE Em] STATE zrBOX SuE HIGGINSVILLE MO icularly susceptible uneven coning angle due bending blade holders achieve pitch angles After setting blade pitch per manual check static level blade may find rotor blade tip appears higher other though gimbal assembly teeter level may check coning angle quickly using transmitter anten na Set helicopter level surface transmitter placed antenna can adjusted just barely touch center rotor blade tip rotate rotor opposite blade brought same position level differs adjust whichever blade necessary achieve proper con ing angle Once proper coning angle con firmed quickly check again lead lag blade pitch readjust neces sary Finally set tail rotor blade pitch eyeball method set T/R pitch approximately twice M/R pitch setting beginning setting will also fine tuned time run-up did mention throttle set-up because instructions detail set up can differ between various fixed pitch collective machines will say should sure throttle free move full throw servo generally half stick transmitter should show throttle barrel half open Mixing throttle collective pitch should per instructions Now balance machine slightly nose heavy balanced center gravity shown plans CG usually directly through slightly forward center line MIR shaft Next month well start engine see well static set-ups work following articles Ill try ex plain some terms used describing RC hellcopter few basics helicopter flight move flying field some hints set-up hints may seem out place sure wanted start flying im mediately Before close month Ill pass word Horace Hagen planning meeting RC Helicopter enthusiasts years Toledo show Dates times will follow Another short topic Charlie Sjobeck Vermont invites prospective RC Helicopter pilots area contact him assistance address Charles F Sjobeck Happy Hollow Road South Royalton VT 05068 Charlie came North Carolina Helicopter Associa tion Championships won Sports man Class flying Hell-Boy Funny state championships won out-of-state contestants Bill Youmans won Walt Schoonard placed third both flying Hell-Boys both out state What happened home court advantage speaking Hell-Boys Ive just finished machine smooth responsive stable joy fly great year flying helicop tersjoin us See next month Dave Chesney Ri 9 Box 62 IA Greensboro NC 27409 CL Scale/Gretz continued page 37 throttle engine position obtained movement handles throttle lever forward As trigger goes forward middle throttle control line being drawn towards control handle other two up down lines being extended away movement matching bellcrank pulling updown lines extending throttle line towards handle throttle pushrod movement created bellcrank interaction up-down lines throttle line Thus equal tension pull lines flight always maintained three lines regardless throttle position Both companies have two basic types bellcranks referred Upright Inverted Drawing #2 shows February 1979 99 Bs /ktz4ut IW4t Size Height--1125 Length--143 Width--O5 style needed particular model de pends general arrangement subject aircraft layout models control system An Upright bellcrank intended bolting top plywood mounting plate model best access bellcrank compartment top model high- shoulder-wing design bellcrank mounted fuselage low-wing design bellcrank mounted top wing An verted bellcrank bolted bottom plywood mounting plate best access bellcrank com partment bottom model low-wing design bellcrank mounted fuselage high- shoulder-wing design bellcrank bottom wing Mount bellcrank least thick 5-ply plywood according manufac turers instructions Pay particular atten tion part about having slot bellcrank mounting plate 90 ele vator pushrod eliminates undesirable elevator movement flight engine throttle setting changed usually lubri cate bellcranks moving parts graphite spray available small tube hardware stores Lastly control system installation thoroughly check double-check abso lutely no binding undue friction systems operation must work perfectly free best performance stiff balky control system almost always indicates im proper installation can cause special handling problems during low line-tension maneuvers like takeoff landing taxi Give yourself model chance perform up full potential making sure control system works easily smoothly throughout its entire range Political protest model airplane con test Sounds ridiculous doesnt thats what happened last summer As probably know 1978 RC & CL Scale World Championships held con junction 1978 Control Line World Championships Stunt Speed Team Race common site Woodvale England sounded great parties countries Russia Yugo slavia Bulgaria Czechoslovakia Po land dropped out of events political protest against entry South Africa CL Team Race CL Scale WC event fatally affected FAI rules require minimum five participat ing countries qualify event ficial World Championshipsother wise simply International con test So withdrawal Russian Polish teams CL Scale forced its can cellation World Championships event last minute news reached AMA days fore US team members sched uled depart England As travel plans motion models packed team spirit high decided send over CL Scale team members Ray Smith Dan Osdoba Roland Baltes still possible hope International level competition would held never did materialize cant help feel boy cott somewhat childish its concep tion ineffectiveness water under bridge point Cana dians expected put bid host 1980 Scale World Championships Ottawa sincerely hope will tempt organize CL Scale WC event part festivities Under circum stances seems cancella tion CL Scale event Woodvale year product Scale events being tied Control Line gen eral WC reflection current interest FAI CL Scale FAI Canadian organizers should remember CL Scale event well attended strongly contested previous Scale World Championshipsincluding 1974 Lakehurst New Jersey Mike Gretz Box 162 Montezuma IA 50171 CL Racing/Lee continued page 39 sound just like Well let copy last rule assumed usual sportsman ship conduct Northwest competitors will prevail running event event director may disqualify entrant feels competing within intent spirit event Sound good Heres part note Mike added wrote newsletter Note unique rule #8 above 77 NW Regionals Racing Events Director Sport Race entrants threatened disqualification appeared competing too seriously Further highly suggested smile lot show everybody what fun having Im serious Again group racing fliers poking what ails us compete-at-any-cost syndrome seems make com petitors forget because want have fun Fast Goodyears have pretty good year Goodyear year competing Scale Race course flying has done District 8 did get chance compete Winston Salem Bill Pardues AAAA contest lucky enough win not-great time 606 However times get better season wore Turned 600 flat contest New Orleans nearly wrecked good plane Ft Worth solder joint con trol system come loose causing pancake some repairable damage didnt fly Nats since CL Category Director later wentto South western Control Line Championships Dallas Labor Day turned real good 542 Competition Dallas very good especially Goodyear Bud Doug Harris Kerry Turner Mike Wheeler Jim Ong attendance having placed top five six Open Senior Goodyear Lake Charles 100 Model Aviation -U C Plans Ae lUeded TO Inspire B18s 5i%SI 14o, 810 Bo,6$20 108 Boe 8-17G En, $48 5 100 845- 77 Boe 817 Bomb $30 58 Boeog 88 Benob$13SI 8oe B-17G Fort$25 54 Vgl Corair 025$2099 N 81k Widom P5$69 83 C SkyteoPIe P5F1 $16 48 N 81k Widon P51 $26 48$ Koydel P017 814 81 DPI MoW Bomb $36 * 60 Dog 058 CBS 515 41 88 Moq Bonb $18 42 Boeorg P26A $18 9$ lad Boob 114 $49 45 Boeag P482 P12 $14 50 Hodon Bomber $18 * 47 Cobook P1 IC2 $18 55 NA MiteIeI 825 $22 62 Coo Heek P60 $39 50 Monk 826 Boob 25 ....a.4 47 Cart 80.k P68 527 65 Marlin 826 Bomb $42 Ai~47 Cart C Helldioe $18 68 Sank JU 885 8o, $18 57 Ca 01 E P0180 $20 51 Jonk JU 88S Boo $13 ot SOSCi Sea 515 46 Jon Stalno JU$7 $22 4$ GlorGlodioto g 10E7$17 04$12 93 G8 Beonco 988 17 46 BnaloIMIC 81 $1454 Parhild P01818 43 Neo II EooTie $14 54 lfir$17 42OH2$oo Boo 10 $14 PBICB INCLUDE PSTERNS 501811 Cork DjA1 16 .SSVnkerConBo $18 S.*.45V,ber PB12B&C $14 SEND Si Complete Potorial Catalog •..sAddlO% ALL ORDERS Nicknamed Whistling Death Japanese foes F4U Corsair scored incredible 11to-i kill/lou average during World War II also Americas first 400mph-plus fighter Dick Scrogin built 36 span model version Sterling kit powered itwitha Fox 35