S vm&sTirst Frequency control RC flying field certainly safety consideration Safetycheck rubberwinder Weight limits RC models Ether diesel fuel John Preston THINK RC modelers would agree safety flying field gins system con trol use various radio frequencies May 1982 issue Model Aviation column dis cussed merits two frequency control systems com monly used RCers Take clothespin off board clip antenna system Put clothespin other marker onto board system simplicity Im going refer two systems respectively Subtractive Additive systems first probably prevalent system must remove subtract marker board before tuming transmitter absence marker board indicates use fre quency denotes second additive sys tem must add marker board its presence board denotes frequency use topic being covered second time because twice last month Ive asked question Which best system use Best instance presumably means safest Both systems have advantages disadvantages discussed May 82 column both de pend human mind remember some thing before tuming transmitter can point other say best Id very interested hear rea son selection January meeting fellow club members discussed design new frequency control board flying field would have pro vision additional II channels 72 MHz band can now use extra II channels now have choice 24 frequen cies happen have amateur radio license choice goes up 29 So make long story short belong club uses subtractive frequency control system will now need control board has 29 pins other markers Somebody club will have appointed Pin Monitor ensure always pin frequency board beginning days flying might unreasonable chore present consider what happens 1991 time will have total 50 aircraft channels Pin Monitors task could get out hand Perhaps future additive system frequency control will workable system No Pin Monitor needed system since flier provides own pin recent letter Charles Fennen Humble TX asked approved best way han dling frequency control AMA re sponse stated So far know answer vote other what Im asking Its reasons preferring versus other want see Bear mind todays 29 frequencies will multiply 50 1991 Will system work number available channels favorite models powered en ergy stored some strands twisted rubber tip Joe Wagner New Wilmington PA might save some grief happen use Stanley drill winder drill Joe talking about has wooden handle merely push fit onto metal centerpost quote Joe could readily see no mechanical connection tween hand drills wooden handle metal centerpost drill designed stand push loads pulls Joe fortunate handle let go using drill twist some wires together rather winding 16 strands -in rubber someone asks act holder rubber-motor winding operation better check what kind winder being used its Stanley drill decline offer unless handle has modi fied provide positive mechanical attach ment Joes method follows have modified winder greatly since harmless accident could have put back together epoxy drilled crosshole through both handle centerpost cross-pin However truly safe winder now made up spade grip bolted winders centerpost way hands slippery rubber lube its very unlikely winder can slip out hands Im stretch-winding Gollywock Cahill Clodhopper love oldtime rubber models Joes letter also mentioned another safety-related topicthe weight limit large model airplanes discussed column February 1983 issue magazine Joe favors Bill Northrop-proposed 40-lb limit GEN-84-9 date has poor response columns request commens model weight limits addition Joes letter five others took time respond really enough form meaningful opinion what majority modelers prefer However record letters can summarized follows letter Spillway RC Club Norco LA favors IMAA guidelines being best club also supports Kent Walters proposal summarized column February 1983 issue letter Kent himself some constructive criticism IMAA guidelines did noted largemodel flier Art Johnson Both Kents Arts comments have forwarded IMAA will useful discussion AMA Safety Committee such time meets Note As February 1 no meeting seheduled Two other letter-writers believe 40 lb too Continued page 16 /IJA 1 00K IM AlcZlNCa- IS FOR YOU G-UyS TO GIVE TI4tS l-JE.W SYSTEM FAIR -~- 14 Model Aviation 0 Top Quality Name Can Depend 4-40 STEEL KWIK-LINKS 4 4-40 links con structed top quality spring steel control linkage hook-ups Cat No 3042 $100 DU-BRO 4-40 KWIK-LINKS 12 rod17 included p7 / Cal No 306$ 75 ea NEKEL PLATED SOLDER LINKS new 4-40 solder links nickel plated easy soldering Cat No 305 2 $100 SMALL NYLON HINGESSTANDARD NYLON HINGESHEAVY DUTY 1/4 scale HINGES Easy install precisionStrong smooth andBuilt br heavy load DUeBRO molded rigid nylon hingesas easy install as-heavy duty hinges ideal blash tree lockedthe small the1/4 scale applications checked tor F y duty hinges use removable 0 0 0 smoothness thel sixCC qpj-3/64 dia cotter pin factoryholes etormax-- holding0 0 0 0Cc Cat No 1186 perpk $1 00Cat No 116 6 perpkg $110Cat No 257 Cat No 1i915 per ph Si 95Cal No 117 15 per ph $24915 per ph$375 DUeBROS COMPLETE SELECTION OF BRASS PLATED DURA-COLLARS Enough stock threads will strip can re-worked other uses Both heavy duty regular collar sets complete Allen Wrench Cat No 244 1/4243 141 3/IS Q139 1/8 138 3/32 137 IllS 4O-5/32 kHeawydutv $1 00-2perset J-$S0perset setsof4 ] HEAVY DUTY 440 BALL LINK Cat No 259 Shown actual size new hefty ball link perfect 1/4 scale application Set includes heavy duty nylon socket 5 pIece set $125 complete switch KWIK-SWITCH MOUNT mounting set Install battery switch anywhere fuse age minutes drill ing 3/1 6 hole CatNo203$13 4sf us DUOBRO SNAP-ON BALL LINKS ll Bolt-on links threaded links links rivit shafts take care misalignment Tough nylon link snaps holds tight Excellent offset steering servo throttle hookups Cat No 180 Cat No 181 Cat No 182 Belt 585 flireaded 585 DU PRODUCTS INC 480 Bonner Road Wauconda Illinois 60084 much favor respectively 20 lb 5kg II lb Seems like Charles Fennen absolutely correct stated Ask 40 people will get 40 answers Dont ask go havent faintest idea guess asked state opinion Id question anyone wishing build model going tip scales 40 lb doent join EAA construct homebuilt Ultralight other hand cant prove 55-lb model presents significantly greater hazard weighs 40 lb Changing subject model engine fuels letter Doug Dahlke points out increased would have No Charles letter prompted recent move San Antonio fliers used subtractive frequency con trol system pin clipped transmitter antenna whereas new club uses additive system Charles stated club using method person takes flag places board marked appropriate colors has nail hang flag see flag nail frequency dont fly like double negative wonder others feel same way Charles see something indicates use fre quency negative positive indication use suppose depends point view As Charles went say response own question system foolproof realize ask 40 people will get 40 answers 10 committees Probably very true can find answer question foolproof system Before diligently sit down pen paper give response lets just briefly look some merits demerits system Merits additive system presence marker board denotes frequency use flier pro vides own marker therefore no Pin Monitor needed markers have fliers name new arrival field can see-at-a-glance using frequency desired system lends itself very well forming queue fliers awaiting use frequency has provision board waiting fliers clip pins order take place line Demerits system commonly used subtractive system changeover could result confusion accidental 'shootdowns flier possession pin case shoot-down provides irre futable evidence right fly other words additive system could easily abused dishonest flier elected switch markers control board does lend itself well subtractive system use contest non-club members will pre sent Merits subtractive system pin marker antenna absence pin marker board denotes frequency use Probably prevalent system currently use flier has tan gible evidence form pin antenna really did remember follow rules frequency contrul Demerits Does tell using frequencyonly somebody using Re quires somebody club ensure pins frequencies always present pin miss ing board could mean either use frequency pin went home still clip ped someones antenna might difficult ascertain has oecurred crowded field Could prone vandalism theft pins flying fields open public Continued page 84 16 Model Aviation NEW Nor Ca ACCJAC AVIONIUS ACCU ETACH LCD2R3MONITOR VOLTM ttie state K YoU get Cead DetefmIyour NiC CNARG Makes accura1ct idle thru~afge Wit safely fast chargbY topend justment batteri5 Wik pack ~ tinY gals out Se d0 Ioam5St TX/IX ba atchIn 519a h dual scale r iOOX cycle wit i tery combosage drop capabiljitthfull Charge electronics 95 ORDER YOURS NOW 7 9 Pd Send check money order no CODs NorCal AVIONICS Inc PO Box 70956 sunnyvale CA 94086 California residents add 60/o tax Add $300 shipping outside continental USA Dealer inquiries invited 0tm ctitjPccJiJ 615 So Gallatin Rd son TN 37115 615 868-6811_____ Mon thru Sat am 500 pm RTER & GIANT SCALE S IMQOELERS.RADIO SYSTEMS I-- -FUTABAand ROYAL ACCESSORIES FOR j MOST RADIOS LLIT-SAP need LLIT-SAP multiple servo LONG LEAD INTERFERENCE TRAP & SERVO ALTERNATE POWER adap tar Specify radIo ordering $2995 postage paid send large SSAE for literature Safety/Preston Continued page 16 final word frequency control Whichever ystem prefer goes saying C flying fields should have transmitter im pound impound frequency control board same structure trip impound obtain ones transmitter should prompt old memory also doing whatever necessary indicate use frequency Transmitters scattered willy-nilly throughout pit area sure-fire way leaving oneself open frequency abuse inevitable shoot-down Now can get pen paper drop line subject Which frequency control system foolproof simple popularity model diesel engines suggests word warning diesel fuel principal tngredient makes model diesel engine oper ate benefit glow plug ether volatility ether greatly exceeds methyl alcohol Treat ether diesel fuel would gasoline Dont keep basement beside furnace gas hot water heater mix own diesel fuel outside away ig nttion source Remember ether used used anesthetic back old days avoid breath ing fumes last tip comes fellow club member Lou Bruhn really suggstion makers RC equipment latest crop transmitters appear have about exhausted number whistles bells can realistically use ful making easier control set up model Lou suggests adding built-in frequency monitor transmitter person already has everything else way might work would use three-position switch instead current two-position On/Off switch Switching transmitter would become two-step affair Going Off first position would turn frequency monitor would indicate either audible tone meter whether channel clear no incoming signal present would comfortable switching third position switch would turn transmitter turn off frequency monitor Just though might further decrease num ber accidental shoot-downs Have safe month John Preston 7012 LIvira Cr Falls Church VA 22042 Fun/Winter Continued page 24 pardon Hal hes back sharper flying Im jealous cant judge height coming over fence landings up down ttrip often rough Props prove interesting Hal tells us still speaking 2-Meter rubber power Wakefield sizes provided limited climb long low flight ground effect much smaller low-pitched prop gave good climb altitude much distance Something between gave decent altitude much longer cruise altitude plus longest distancethe realistic flight same amount rubber limited cost ability wind What noticed big props continues once two-thirds winds gone better stopping prop Fold During last portion Continued page 92 84 Model Aviation SUMLI UI-1llMUISJI.3/ti UIALI b MIIUUS Send5OforcatalogN 216-499-5323 RC Kits Mfg\ . 706 Easton NE\ IL Canton OH 44721 N STEPHENS ACRO REPAIR SERVICE FOR HOBBY LOBBY EI LOGICTROL FUTABA HOBBY SHACK ROYAL LINE
Edition: Model Aviation - 1983/05
Page Numbers: 14, 16, 84
S vm&sTirst Frequency control RC flying field certainly safety consideration Safetycheck rubberwinder Weight limits RC models Ether diesel fuel John Preston THINK RC modelers would agree safety flying field gins system con trol use various radio frequencies May 1982 issue Model Aviation column dis cussed merits two frequency control systems com monly used RCers Take clothespin off board clip antenna system Put clothespin other marker onto board system simplicity Im going refer two systems respectively Subtractive Additive systems first probably prevalent system must remove subtract marker board before tuming transmitter absence marker board indicates use fre quency denotes second additive sys tem must add marker board its presence board denotes frequency use topic being covered second time because twice last month Ive asked question Which best system use Best instance presumably means safest Both systems have advantages disadvantages discussed May 82 column both de pend human mind remember some thing before tuming transmitter can point other say best Id very interested hear rea son selection January meeting fellow club members discussed design new frequency control board flying field would have pro vision additional II channels 72 MHz band can now use extra II channels now have choice 24 frequen cies happen have amateur radio license choice goes up 29 So make long story short belong club uses subtractive frequency control system will now need control board has 29 pins other markers Somebody club will have appointed Pin Monitor ensure always pin frequency board beginning days flying might unreasonable chore present consider what happens 1991 time will have total 50 aircraft channels Pin Monitors task could get out hand Perhaps future additive system frequency control will workable system No Pin Monitor needed system since flier provides own pin recent letter Charles Fennen Humble TX asked approved best way han dling frequency control AMA re sponse stated So far know answer vote other what Im asking Its reasons preferring versus other want see Bear mind todays 29 frequencies will multiply 50 1991 Will system work number available channels favorite models powered en ergy stored some strands twisted rubber tip Joe Wagner New Wilmington PA might save some grief happen use Stanley drill winder drill Joe talking about has wooden handle merely push fit onto metal centerpost quote Joe could readily see no mechanical connection tween hand drills wooden handle metal centerpost drill designed stand push loads pulls Joe fortunate handle let go using drill twist some wires together rather winding 16 strands -in rubber someone asks act holder rubber-motor winding operation better check what kind winder being used its Stanley drill decline offer unless handle has modi fied provide positive mechanical attach ment Joes method follows have modified winder greatly since harmless accident could have put back together epoxy drilled crosshole through both handle centerpost cross-pin However truly safe winder now made up spade grip bolted winders centerpost way hands slippery rubber lube its very unlikely winder can slip out hands Im stretch-winding Gollywock Cahill Clodhopper love oldtime rubber models Joes letter also mentioned another safety-related topicthe weight limit large model airplanes discussed column February 1983 issue magazine Joe favors Bill Northrop-proposed 40-lb limit GEN-84-9 date has poor response columns request commens model weight limits addition Joes letter five others took time respond really enough form meaningful opinion what majority modelers prefer However record letters can summarized follows letter Spillway RC Club Norco LA favors IMAA guidelines being best club also supports Kent Walters proposal summarized column February 1983 issue letter Kent himself some constructive criticism IMAA guidelines did noted largemodel flier Art Johnson Both Kents Arts comments have forwarded IMAA will useful discussion AMA Safety Committee such time meets Note As February 1 no meeting seheduled Two other letter-writers believe 40 lb too Continued page 16 /IJA 1 00K IM AlcZlNCa- IS FOR YOU G-UyS TO GIVE TI4tS l-JE.W SYSTEM FAIR -~- 14 Model Aviation 0 Top Quality Name Can Depend 4-40 STEEL KWIK-LINKS 4 4-40 links con structed top quality spring steel control linkage hook-ups Cat No 3042 $100 DU-BRO 4-40 KWIK-LINKS 12 rod17 included p7 / Cal No 306$ 75 ea NEKEL PLATED SOLDER LINKS new 4-40 solder links nickel plated easy soldering Cat No 305 2 $100 SMALL NYLON HINGESSTANDARD NYLON HINGESHEAVY DUTY 1/4 scale HINGES Easy install precisionStrong smooth andBuilt br heavy load DUeBRO molded rigid nylon hingesas easy install as-heavy duty hinges ideal blash tree lockedthe small the1/4 scale applications checked tor F y duty hinges use removable 0 0 0 smoothness thel sixCC qpj-3/64 dia cotter pin factoryholes etormax-- holding0 0 0 0Cc Cat No 1186 perpk $1 00Cat No 116 6 perpkg $110Cat No 257 Cat No 1i915 per ph Si 95Cal No 117 15 per ph $24915 per ph$375 DUeBROS COMPLETE SELECTION OF BRASS PLATED DURA-COLLARS Enough stock threads will strip can re-worked other uses Both heavy duty regular collar sets complete Allen Wrench Cat No 244 1/4243 141 3/IS Q139 1/8 138 3/32 137 IllS 4O-5/32 kHeawydutv $1 00-2perset J-$S0perset setsof4 ] HEAVY DUTY 440 BALL LINK Cat No 259 Shown actual size new hefty ball link perfect 1/4 scale application Set includes heavy duty nylon socket 5 pIece set $125 complete switch KWIK-SWITCH MOUNT mounting set Install battery switch anywhere fuse age minutes drill ing 3/1 6 hole CatNo203$13 4sf us DUOBRO SNAP-ON BALL LINKS ll Bolt-on links threaded links links rivit shafts take care misalignment Tough nylon link snaps holds tight Excellent offset steering servo throttle hookups Cat No 180 Cat No 181 Cat No 182 Belt 585 flireaded 585 DU PRODUCTS INC 480 Bonner Road Wauconda Illinois 60084 much favor respectively 20 lb 5kg II lb Seems like Charles Fennen absolutely correct stated Ask 40 people will get 40 answers Dont ask go havent faintest idea guess asked state opinion Id question anyone wishing build model going tip scales 40 lb doent join EAA construct homebuilt Ultralight other hand cant prove 55-lb model presents significantly greater hazard weighs 40 lb Changing subject model engine fuels letter Doug Dahlke points out increased would have No Charles letter prompted recent move San Antonio fliers used subtractive frequency con trol system pin clipped transmitter antenna whereas new club uses additive system Charles stated club using method person takes flag places board marked appropriate colors has nail hang flag see flag nail frequency dont fly like double negative wonder others feel same way Charles see something indicates use fre quency negative positive indication use suppose depends point view As Charles went say response own question system foolproof realize ask 40 people will get 40 answers 10 committees Probably very true can find answer question foolproof system Before diligently sit down pen paper give response lets just briefly look some merits demerits system Merits additive system presence marker board denotes frequency use flier pro vides own marker therefore no Pin Monitor needed markers have fliers name new arrival field can see-at-a-glance using frequency desired system lends itself very well forming queue fliers awaiting use frequency has provision board waiting fliers clip pins order take place line Demerits system commonly used subtractive system changeover could result confusion accidental 'shootdowns flier possession pin case shoot-down provides irre futable evidence right fly other words additive system could easily abused dishonest flier elected switch markers control board does lend itself well subtractive system use contest non-club members will pre sent Merits subtractive system pin marker antenna absence pin marker board denotes frequency use Probably prevalent system currently use flier has tan gible evidence form pin antenna really did remember follow rules frequency contrul Demerits Does tell using frequencyonly somebody using Re quires somebody club ensure pins frequencies always present pin miss ing board could mean either use frequency pin went home still clip ped someones antenna might difficult ascertain has oecurred crowded field Could prone vandalism theft pins flying fields open public Continued page 84 16 Model Aviation NEW Nor Ca ACCJAC AVIONIUS ACCU ETACH LCD2R3MONITOR VOLTM ttie state K YoU get Cead DetefmIyour NiC CNARG Makes accura1ct idle thru~afge Wit safely fast chargbY topend justment batteri5 Wik pack ~ tinY gals out Se d0 Ioam5St TX/IX ba atchIn 519a h dual scale r iOOX cycle wit i tery combosage drop capabiljitthfull Charge electronics 95 ORDER YOURS NOW 7 9 Pd Send check money order no CODs NorCal AVIONICS Inc PO Box 70956 sunnyvale CA 94086 California residents add 60/o tax Add $300 shipping outside continental USA Dealer inquiries invited 0tm ctitjPccJiJ 615 So Gallatin Rd son TN 37115 615 868-6811_____ Mon thru Sat am 500 pm RTER & GIANT SCALE S IMQOELERS.RADIO SYSTEMS I-- -FUTABAand ROYAL ACCESSORIES FOR j MOST RADIOS LLIT-SAP need LLIT-SAP multiple servo LONG LEAD INTERFERENCE TRAP & SERVO ALTERNATE POWER adap tar Specify radIo ordering $2995 postage paid send large SSAE for literature Safety/Preston Continued page 16 final word frequency control Whichever ystem prefer goes saying C flying fields should have transmitter im pound impound frequency control board same structure trip impound obtain ones transmitter should prompt old memory also doing whatever necessary indicate use frequency Transmitters scattered willy-nilly throughout pit area sure-fire way leaving oneself open frequency abuse inevitable shoot-down Now can get pen paper drop line subject Which frequency control system foolproof simple popularity model diesel engines suggests word warning diesel fuel principal tngredient makes model diesel engine oper ate benefit glow plug ether volatility ether greatly exceeds methyl alcohol Treat ether diesel fuel would gasoline Dont keep basement beside furnace gas hot water heater mix own diesel fuel outside away ig nttion source Remember ether used used anesthetic back old days avoid breath ing fumes last tip comes fellow club member Lou Bruhn really suggstion makers RC equipment latest crop transmitters appear have about exhausted number whistles bells can realistically use ful making easier control set up model Lou suggests adding built-in frequency monitor transmitter person already has everything else way might work would use three-position switch instead current two-position On/Off switch Switching transmitter would become two-step affair Going Off first position would turn frequency monitor would indicate either audible tone meter whether channel clear no incoming signal present would comfortable switching third position switch would turn transmitter turn off frequency monitor Just though might further decrease num ber accidental shoot-downs Have safe month John Preston 7012 LIvira Cr Falls Church VA 22042 Fun/Winter Continued page 24 pardon Hal hes back sharper flying Im jealous cant judge height coming over fence landings up down ttrip often rough Props prove interesting Hal tells us still speaking 2-Meter rubber power Wakefield sizes provided limited climb long low flight ground effect much smaller low-pitched prop gave good climb altitude much distance Something between gave decent altitude much longer cruise altitude plus longest distancethe realistic flight same amount rubber limited cost ability wind What noticed big props continues once two-thirds winds gone better stopping prop Fold During last portion Continued page 92 84 Model Aviation SUMLI UI-1llMUISJI.3/ti UIALI b MIIUUS Send5OforcatalogN 216-499-5323 RC Kits Mfg\ . 706 Easton NE\ IL Canton OH 44721 N STEPHENS ACRO REPAIR SERVICE FOR HOBBY LOBBY EI LOGICTROL FUTABA HOBBY SHACK ROYAL LINE
Edition: Model Aviation - 1983/05
Page Numbers: 14, 16, 84
S vm&sTirst Frequency control RC flying field certainly safety consideration Safetycheck rubberwinder Weight limits RC models Ether diesel fuel John Preston THINK RC modelers would agree safety flying field gins system con trol use various radio frequencies May 1982 issue Model Aviation column dis cussed merits two frequency control systems com monly used RCers Take clothespin off board clip antenna system Put clothespin other marker onto board system simplicity Im going refer two systems respectively Subtractive Additive systems first probably prevalent system must remove subtract marker board before tuming transmitter absence marker board indicates use fre quency denotes second additive sys tem must add marker board its presence board denotes frequency use topic being covered second time because twice last month Ive asked question Which best system use Best instance presumably means safest Both systems have advantages disadvantages discussed May 82 column both de pend human mind remember some thing before tuming transmitter can point other say best Id very interested hear rea son selection January meeting fellow club members discussed design new frequency control board flying field would have pro vision additional II channels 72 MHz band can now use extra II channels now have choice 24 frequen cies happen have amateur radio license choice goes up 29 So make long story short belong club uses subtractive frequency control system will now need control board has 29 pins other markers Somebody club will have appointed Pin Monitor ensure always pin frequency board beginning days flying might unreasonable chore present consider what happens 1991 time will have total 50 aircraft channels Pin Monitors task could get out hand Perhaps future additive system frequency control will workable system No Pin Monitor needed system since flier provides own pin recent letter Charles Fennen Humble TX asked approved best way han dling frequency control AMA re sponse stated So far know answer vote other what Im asking Its reasons preferring versus other want see Bear mind todays 29 frequencies will multiply 50 1991 Will system work number available channels favorite models powered en ergy stored some strands twisted rubber tip Joe Wagner New Wilmington PA might save some grief happen use Stanley drill winder drill Joe talking about has wooden handle merely push fit onto metal centerpost quote Joe could readily see no mechanical connection tween hand drills wooden handle metal centerpost drill designed stand push loads pulls Joe fortunate handle let go using drill twist some wires together rather winding 16 strands -in rubber someone asks act holder rubber-motor winding operation better check what kind winder being used its Stanley drill decline offer unless handle has modi fied provide positive mechanical attach ment Joes method follows have modified winder greatly since harmless accident could have put back together epoxy drilled crosshole through both handle centerpost cross-pin However truly safe winder now made up spade grip bolted winders centerpost way hands slippery rubber lube its very unlikely winder can slip out hands Im stretch-winding Gollywock Cahill Clodhopper love oldtime rubber models Joes letter also mentioned another safety-related topicthe weight limit large model airplanes discussed column February 1983 issue magazine Joe favors Bill Northrop-proposed 40-lb limit GEN-84-9 date has poor response columns request commens model weight limits addition Joes letter five others took time respond really enough form meaningful opinion what majority modelers prefer However record letters can summarized follows letter Spillway RC Club Norco LA favors IMAA guidelines being best club also supports Kent Walters proposal summarized column February 1983 issue letter Kent himself some constructive criticism IMAA guidelines did noted largemodel flier Art Johnson Both Kents Arts comments have forwarded IMAA will useful discussion AMA Safety Committee such time meets Note As February 1 no meeting seheduled Two other letter-writers believe 40 lb too Continued page 16 /IJA 1 00K IM AlcZlNCa- IS FOR YOU G-UyS TO GIVE TI4tS l-JE.W SYSTEM FAIR -~- 14 Model Aviation 0 Top Quality Name Can Depend 4-40 STEEL KWIK-LINKS 4 4-40 links con structed top quality spring steel control linkage hook-ups Cat No 3042 $100 DU-BRO 4-40 KWIK-LINKS 12 rod17 included p7 / Cal No 306$ 75 ea NEKEL PLATED SOLDER LINKS new 4-40 solder links nickel plated easy soldering Cat No 305 2 $100 SMALL NYLON HINGESSTANDARD NYLON HINGESHEAVY DUTY 1/4 scale HINGES Easy install precisionStrong smooth andBuilt br heavy load DUeBRO molded rigid nylon hingesas easy install as-heavy duty hinges ideal blash tree lockedthe small the1/4 scale applications checked tor F y duty hinges use removable 0 0 0 smoothness thel sixCC qpj-3/64 dia cotter pin factoryholes etormax-- holding0 0 0 0Cc Cat No 1186 perpk $1 00Cat No 116 6 perpkg $110Cat No 257 Cat No 1i915 per ph Si 95Cal No 117 15 per ph $24915 per ph$375 DUeBROS COMPLETE SELECTION OF BRASS PLATED DURA-COLLARS Enough stock threads will strip can re-worked other uses Both heavy duty regular collar sets complete Allen Wrench Cat No 244 1/4243 141 3/IS Q139 1/8 138 3/32 137 IllS 4O-5/32 kHeawydutv $1 00-2perset J-$S0perset setsof4 ] HEAVY DUTY 440 BALL LINK Cat No 259 Shown actual size new hefty ball link perfect 1/4 scale application Set includes heavy duty nylon socket 5 pIece set $125 complete switch KWIK-SWITCH MOUNT mounting set Install battery switch anywhere fuse age minutes drill ing 3/1 6 hole CatNo203$13 4sf us DUOBRO SNAP-ON BALL LINKS ll Bolt-on links threaded links links rivit shafts take care misalignment Tough nylon link snaps holds tight Excellent offset steering servo throttle hookups Cat No 180 Cat No 181 Cat No 182 Belt 585 flireaded 585 DU PRODUCTS INC 480 Bonner Road Wauconda Illinois 60084 much favor respectively 20 lb 5kg II lb Seems like Charles Fennen absolutely correct stated Ask 40 people will get 40 answers Dont ask go havent faintest idea guess asked state opinion Id question anyone wishing build model going tip scales 40 lb doent join EAA construct homebuilt Ultralight other hand cant prove 55-lb model presents significantly greater hazard weighs 40 lb Changing subject model engine fuels letter Doug Dahlke points out increased would have No Charles letter prompted recent move San Antonio fliers used subtractive frequency con trol system pin clipped transmitter antenna whereas new club uses additive system Charles stated club using method person takes flag places board marked appropriate colors has nail hang flag see flag nail frequency dont fly like double negative wonder others feel same way Charles see something indicates use fre quency negative positive indication use suppose depends point view As Charles went say response own question system foolproof realize ask 40 people will get 40 answers 10 committees Probably very true can find answer question foolproof system Before diligently sit down pen paper give response lets just briefly look some merits demerits system Merits additive system presence marker board denotes frequency use flier pro vides own marker therefore no Pin Monitor needed markers have fliers name new arrival field can see-at-a-glance using frequency desired system lends itself very well forming queue fliers awaiting use frequency has provision board waiting fliers clip pins order take place line Demerits system commonly used subtractive system changeover could result confusion accidental 'shootdowns flier possession pin case shoot-down provides irre futable evidence right fly other words additive system could easily abused dishonest flier elected switch markers control board does lend itself well subtractive system use contest non-club members will pre sent Merits subtractive system pin marker antenna absence pin marker board denotes frequency use Probably prevalent system currently use flier has tan gible evidence form pin antenna really did remember follow rules frequency contrul Demerits Does tell using frequencyonly somebody using Re quires somebody club ensure pins frequencies always present pin miss ing board could mean either use frequency pin went home still clip ped someones antenna might difficult ascertain has oecurred crowded field Could prone vandalism theft pins flying fields open public Continued page 84 16 Model Aviation NEW Nor Ca ACCJAC AVIONIUS ACCU ETACH LCD2R3MONITOR VOLTM ttie state K YoU get Cead DetefmIyour NiC CNARG Makes accura1ct idle thru~afge Wit safely fast chargbY topend justment batteri5 Wik pack ~ tinY gals out Se d0 Ioam5St TX/IX ba atchIn 519a h dual scale r iOOX cycle wit i tery combosage drop capabiljitthfull Charge electronics 95 ORDER YOURS NOW 7 9 Pd Send check money order no CODs NorCal AVIONICS Inc PO Box 70956 sunnyvale CA 94086 California residents add 60/o tax Add $300 shipping outside continental USA Dealer inquiries invited 0tm ctitjPccJiJ 615 So Gallatin Rd son TN 37115 615 868-6811_____ Mon thru Sat am 500 pm RTER & GIANT SCALE S IMQOELERS.RADIO SYSTEMS I-- -FUTABAand ROYAL ACCESSORIES FOR j MOST RADIOS LLIT-SAP need LLIT-SAP multiple servo LONG LEAD INTERFERENCE TRAP & SERVO ALTERNATE POWER adap tar Specify radIo ordering $2995 postage paid send large SSAE for literature Safety/Preston Continued page 16 final word frequency control Whichever ystem prefer goes saying C flying fields should have transmitter im pound impound frequency control board same structure trip impound obtain ones transmitter should prompt old memory also doing whatever necessary indicate use frequency Transmitters scattered willy-nilly throughout pit area sure-fire way leaving oneself open frequency abuse inevitable shoot-down Now can get pen paper drop line subject Which frequency control system foolproof simple popularity model diesel engines suggests word warning diesel fuel principal tngredient makes model diesel engine oper ate benefit glow plug ether volatility ether greatly exceeds methyl alcohol Treat ether diesel fuel would gasoline Dont keep basement beside furnace gas hot water heater mix own diesel fuel outside away ig nttion source Remember ether used used anesthetic back old days avoid breath ing fumes last tip comes fellow club member Lou Bruhn really suggstion makers RC equipment latest crop transmitters appear have about exhausted number whistles bells can realistically use ful making easier control set up model Lou suggests adding built-in frequency monitor transmitter person already has everything else way might work would use three-position switch instead current two-position On/Off switch Switching transmitter would become two-step affair Going Off first position would turn frequency monitor would indicate either audible tone meter whether channel clear no incoming signal present would comfortable switching third position switch would turn transmitter turn off frequency monitor Just though might further decrease num ber accidental shoot-downs Have safe month John Preston 7012 LIvira Cr Falls Church VA 22042 Fun/Winter Continued page 24 pardon Hal hes back sharper flying Im jealous cant judge height coming over fence landings up down ttrip often rough Props prove interesting Hal tells us still speaking 2-Meter rubber power Wakefield sizes provided limited climb long low flight ground effect much smaller low-pitched prop gave good climb altitude much distance Something between gave decent altitude much longer cruise altitude plus longest distancethe realistic flight same amount rubber limited cost ability wind What noticed big props continues once two-thirds winds gone better stopping prop Fold During last portion Continued page 92 84 Model Aviation SUMLI UI-1llMUISJI.3/ti UIALI b MIIUUS Send5OforcatalogN 216-499-5323 RC Kits Mfg\ . 706 Easton NE\ IL Canton OH 44721 N STEPHENS ACRO REPAIR SERVICE FOR HOBBY LOBBY EI LOGICTROL FUTABA HOBBY SHACK ROYAL LINE