____first SgItws Its spring safetycheckup time Ni-Cd batteries RC models wiring harnesses potential fire-hazards Portable safety barriers Some tips prop safety suggestion RC clubs respect first flights new models John Preston AS WE BEGIN column 1983 three days old However since will included April issue Model Aviotion will reading sometime around end February beginning March its little late wishing Happy New Year spring just around corner will wish happy safe new flying season hang up equipment duration winter perhaps few reminders might order before rush out flying field try destroy what spent winter creating RC flier last time radios checked qualified technician very least batteries should cycled determine condition lucky enough receive new radio Santa would well-advised run bat teries through discharge cycle Virtually nothing buy can guaranteed 100% free defects batteries check out OK remember jot down time took go full charge point discharger shut off Use baseline future reference models flew times dur ing 1982 should also receive going-over Are control surface hinges still secure somewhat ratty fuel-soaked might good time replace some same might apply fuel tank and/or tubing will assume took time last fall thor oughly clean up engines give liberal dose rust-inhibiting oil RCers should take s close look installation servos pushrods Are servo mounting rails still se cure did glue joint let go sometime during last year addition being safety risk model crashes can expensive An ounce prevention worth pound cure Its since mentioned RC Heli copters column receive very little mail 12 Model Aviation PROP RPM thousands 6789 10 11 12 13 34 15 16 17 181920 U 10 ul 11 12 13 14 O 15 0 16 0 17 0 18 107 125 143 161 178 196 214 232 250 268 286 303 321 125 146 167 187 208 229 250 271 292 312 333 354 375 143 161 167 187 190 214 214 241 238 268 262 295 286 321 309 348 333 375 357 402 381 428 405 455 428 482 178196214232250268286303321339357 208229250271292312333354375396416 238262286309333357381405428452476 268295321348375402428455482509535 297327357387416446476506535565595 327360393425458491524556589622654 357393428464500535571607643678714 387425464503541580619657696735773 416458500541583625666708750791833 446491535580625669714759803848892 476524571619666714762809857904952 5065566076577087598098609109611011 53558964369675080385791096410171071 Note Tip speedS equal exceed Mach number region sea ievel conditionsapproximate regarding strange machines rotating wings may mean either safety record better fixed-wing models number being flown small very few incidents involving injury associated model choppers however incident involving RC Helicopter reported District VIII VPs column Ted White February 1983 issue magazine ac count Teds column written victim received severe blow chest arms caused main rotor blades parting company hub Since Helicopters tend flown closer people fixed-wing models aware potential hazard still have February magazine Henry Haffkes Gee Bee R-l cover take time read Teds column page 105 Pennsylvania modeler recently telephone conversation ihe associate editor magazine subject Portable Safety Bar riers modeler commenting AMAs suggested field layout guidelines locate parking area 80 ft back edge runway modeler suggested cars can very effective portable safety barriers might better located closer scene activity doubt AMAs insurance carrier would too excited suggestion Based information thai received last year regarding Continued page 14 AAk iiis MAVBE 14ELL CxO AWAY IF WE cxlJ-r LOOK AT 1411A PROP TIP SPEED IN MPH 440 STEEL KWIK-LINKS P 4 40 links con structed top quality spring steel control linkage hook-ups Cat No 3042 $100 DU-BRO 4-40 KWIK-LINKS 12 rod included / / Cat No 306$ 75 ea NEKEL PLATED SOLDER LINKS new 4-40 solder links nickel plated tor easy soldering Cat No 305 2 $100 SMALL NYLON HINGESSTANDARD NYLONHINGESHEAVY DUTY e HINGES Easy install precisionStrong smooth andBuilt heavy load DUBFlO molded rigid nylon hingesas easy install asheavy duty hinges ideal flash free lockedthe small thej1/ scale applications checked forft[heavy duty hinges-They use removable 00 0 smoothness thelCCAll have six.I-mj3/64 dia cotter pin 0 0 0 factory holes each-Zy sideformax- 000 imum holding 000 Cat No 1186 perpkg $100Cat No 116 6perpkg $110Cat No 257 CatNo 119lsperpkg $195Cat No 117 l5perpkgS249lsperpkg$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 7132141 316 145- 532 139 18 138 332 1371116 K V Heavy duty $1 00- 2 per set j----------------------------- $80 per set sets 014 HEAVY DUTY 4-40 BALL LINK Cat No 259 Shown actual size new hefty ball link pertect tor 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 Cat No 203$175-q~ E~yi1 /4 DUeBRO SNAP-ON BALL LINKS Bolt-on links threaded links links rivit shafts take care misalignment Tough nylon link snaps holds tight Excellent offset steering servo throttle hook-ups Cat No 180Bolt $ 85 Cat No 181Threaded $85 Cat No 182Rivit $85 DUeBRO PRODUCTS INC 480 Banner Road Wauconda Illinois 60084 insurance claims see September t982 column frequent insurance claim atready result models hitting vehicles Whether vehicles cars parked focal flying field dont knowhut assume least some Nevertheless safety barrier separates active flying area spectators and/or other modelers good ideaprovided flying never takes place behind barrier takes us letter received just before Christmas froim good friend left Wash ington DC area upon recent retirement now resides Idaho tetter included color slides Idaho clubs flying field showed 6-ft-high chain link fence between runway pit area intended safety barrier friend states - seems work psychological deterrent rather bul wark stop low-flying models Most fly ing done front pits 3600-flying unheard Flying over pits parking allowed strongly disagree 3600-flying club members feel poses no prob lem wide-open spaces fly agree friend flying behind pits parking area safe practice such activity also violation previously mentioned AMA suggested field layout guidelines Editors note kind flying also violation AMA Safety Code Dont RBM another subjectenergy Ni-Cd bat teries letter Jesse Aronstein Pough keepsie NY reported rather unusual occurrence quote Most RC aircraft have batteries board will provide considerable energy short circuit occurs personally experience made point quite vividly sent flight pack manufacturer service fresh charge 550 mAh batteries system retumed new battery pack wiring sent old pack back explanation received shorted condition Inspec tion showed wiring switch internal parts switch shorted resulting insulation wires between switch battery being charred melted battery case showed signs very high temperature wire exit hole Fortunately no fire occurred No post office postal delivery truck burned result incident potential fire ignition clearly evident however lesson learned little cost' Some years back read report incident may have similar cause related Jesse report alleged brand new RC system purchased hobby store during trip store purchasers home battery pack shorted caused fire partially consumed station wagon being transported have no means confirming fire really started shorted battery pack does seem charged Ni-Cd pack has sufficient energy ignition source should become shorted routine check wiring harnesses switches would seem order subject switches recently read safety-related article clubs newsletter touched topic However some what puzzled about reasoning behind ad vice gave article stated Another safety item ON-OFF switch receiver must mount switch fuselage side aircraft should method ically check operation prior flight Con flnued page 118 14 Model Aviation Top Quality Name Can Depend _______NEW________ Safety/Preston Continued oaae 14 best spot mount switch servo tray inside fuselage most always switeh fails mounted side fuse majority radio manufacturers pro vide servo trays have location mounting switch articles weve seen instruct beginners install radio show receiver switch located fuselage side would like ask readers opin ion switch mounted way prone failure mounted servo tray rationale can think would cause premature failure switch fuselage side increased likelihood contacts may become dirty seems like forever mentioning something about hazards propellers letter Murray Granshack included propeller safety tip sure whether have previously mentioned Another hint about safety wood props tighten prop nut too much thereby crush wood center causing prop blades fly off two directions engine running think lot beginners tend suggest dont already own four-way prop wrench should buy chance overtightening prop nut will creased use six- seven-in -long openended wrench rather shorter four-way wrench Similarly using AMAstyle acom prop nut requires 5/32-in dia meter steel rod tightening keep length rod about four five Another letter subject props comes Phillip Nickell Longmont CO Phillip included some charts formulas give prop tip speed theoretical forward speed model respect prop diameter rpm prop pitch Since forward travel speed given prop pitch rpm somewhat con troversial issue going touch However including chart illustrates prop tip speed range prop diameters rpms Perhaps next time tweak needle valve ultimate top-end per formance will think about speed piece wood plastic thats fraction inch away fingers subject prop tip speed did ever think about prop noiseproducing component model recently attended AMA Executive Council meeting Ed Izzo VP District chairman AMAs Noise Committee talked about suppression model aircraft noise com mittee has constructed quiet Pattem model features among other things three-bladed prop reducing prop diameter adding extra blade can move same amount air some given rpm reduction prop tip speed consequent reduction prop noise Since us use ineffective mufflers hear engine exhaust noise According Ed engine exhaust noise easiest thing reduce quest tranquility flying field Muffler manufacturers take note some products sell under label muffler nothing short joke opinion writer long overdue establishing maxi mum sound output levels model aircraft en gines Perhaps Eds committee will help achiev ing goal Since previous paragraph has probably made us public enemy No muffler manufac turers lets see can upset few model maga zine publishers too exception MAs however Ron Sebosky Advance NC sent us clipping recent issue model magazines no MA part construction article RC Scale model author article stated fact often fly local super market parking lot agree Ron such flying site leaves something desired safety point view might prudent publishers magazines delete such statements made contributors lest others get idea club should solve flying site problems moving parking lot local supermarket chain True model con struction article small 38-in -winspan /2A power could still cause serious injury should hit person could totally unaware parking lot being used airport rather just place parking ones car last item round out months epistle comes Flight Line News newsletter Conejo RC Modelers edited Art Addington title Safety First Flight Courtesy Some time ago adopted rule first flight aircraft would done solono other aircraft sky As rules go has slowly lost its presence result ero sion evident two weeks ago young man asked would help him first flight did safety check took wing off another flier check controls make sure properly rigged Two other fliers up takeoff little wild nose steering too sensitive say least made ourselves known other two fliers plane far out trim would climb idle very little roll control landed plane deadstick pushing forward elevator control little work pits another flier helped put new plane up takeoff scared H--- out other flier up new model almost hit him did same thing twice trying land fliers comment dont put plane pits leave Good advice Leave until can fly its lonesome leamed lesson hope telling will save accident also hope relating story column other clubs might give some thought requirement first-flights model should performed no others air Have safe month John Preston 7012 Elvira Ct Foils Church VA 22042 Piper Cub J-3/Reese Continued paqe 28 cranks drill down through outer hole bellerank 1/16-in drill through balsa bottom drill running rotate bellerank gently cut curved slot pushrod exit Build wing center section stacking ribs spar joiners 1/16-in balsa bottom Trial-fit wing panels center section everything fits easily add top 1/16 sheeting center sec tion Epoxy wing panels center blocking up wing tip /2 Use 1 under tip dont use ailerons 118 Model Aviation Nick GIANT RIC SCALt f-LAN DESIGNS 2 4 Cu size Engines AT6 TEXAN24 1101 Span$2700pp uSA POKKER DR127 I63 TIp$2500pp USA FIF BEARCAT2/ 166 Span$2700pp USA CURTISS P-4024 19C Span$2700pp USA FALl CORSAIR2 192 Span$2700pp USA Fiberglass Cowlings & Canopies available also send slamp far derailed bocbureS an Gianl scale Accessarles Oar Plans ned Poslpaid wilbin Ibe u5Al 0. S
Edition: Model Aviation - 1983/04
Page Numbers: 12, 14, 118
____first SgItws Its spring safetycheckup time Ni-Cd batteries RC models wiring harnesses potential fire-hazards Portable safety barriers Some tips prop safety suggestion RC clubs respect first flights new models John Preston AS WE BEGIN column 1983 three days old However since will included April issue Model Aviotion will reading sometime around end February beginning March its little late wishing Happy New Year spring just around corner will wish happy safe new flying season hang up equipment duration winter perhaps few reminders might order before rush out flying field try destroy what spent winter creating RC flier last time radios checked qualified technician very least batteries should cycled determine condition lucky enough receive new radio Santa would well-advised run bat teries through discharge cycle Virtually nothing buy can guaranteed 100% free defects batteries check out OK remember jot down time took go full charge point discharger shut off Use baseline future reference models flew times dur ing 1982 should also receive going-over Are control surface hinges still secure somewhat ratty fuel-soaked might good time replace some same might apply fuel tank and/or tubing will assume took time last fall thor oughly clean up engines give liberal dose rust-inhibiting oil RCers should take s close look installation servos pushrods Are servo mounting rails still se cure did glue joint let go sometime during last year addition being safety risk model crashes can expensive An ounce prevention worth pound cure Its since mentioned RC Heli copters column receive very little mail 12 Model Aviation PROP RPM thousands 6789 10 11 12 13 34 15 16 17 181920 U 10 ul 11 12 13 14 O 15 0 16 0 17 0 18 107 125 143 161 178 196 214 232 250 268 286 303 321 125 146 167 187 208 229 250 271 292 312 333 354 375 143 161 167 187 190 214 214 241 238 268 262 295 286 321 309 348 333 375 357 402 381 428 405 455 428 482 178196214232250268286303321339357 208229250271292312333354375396416 238262286309333357381405428452476 268295321348375402428455482509535 297327357387416446476506535565595 327360393425458491524556589622654 357393428464500535571607643678714 387425464503541580619657696735773 416458500541583625666708750791833 446491535580625669714759803848892 476524571619666714762809857904952 5065566076577087598098609109611011 53558964369675080385791096410171071 Note Tip speedS equal exceed Mach number region sea ievel conditionsapproximate regarding strange machines rotating wings may mean either safety record better fixed-wing models number being flown small very few incidents involving injury associated model choppers however incident involving RC Helicopter reported District VIII VPs column Ted White February 1983 issue magazine ac count Teds column written victim received severe blow chest arms caused main rotor blades parting company hub Since Helicopters tend flown closer people fixed-wing models aware potential hazard still have February magazine Henry Haffkes Gee Bee R-l cover take time read Teds column page 105 Pennsylvania modeler recently telephone conversation ihe associate editor magazine subject Portable Safety Bar riers modeler commenting AMAs suggested field layout guidelines locate parking area 80 ft back edge runway modeler suggested cars can very effective portable safety barriers might better located closer scene activity doubt AMAs insurance carrier would too excited suggestion Based information thai received last year regarding Continued page 14 AAk iiis MAVBE 14ELL CxO AWAY IF WE cxlJ-r LOOK AT 1411A PROP TIP SPEED IN MPH 440 STEEL KWIK-LINKS P 4 40 links con structed top quality spring steel control linkage hook-ups Cat No 3042 $100 DU-BRO 4-40 KWIK-LINKS 12 rod included / / Cat No 306$ 75 ea NEKEL PLATED SOLDER LINKS new 4-40 solder links nickel plated tor easy soldering Cat No 305 2 $100 SMALL NYLON HINGESSTANDARD NYLONHINGESHEAVY DUTY e HINGES Easy install precisionStrong smooth andBuilt heavy load DUBFlO molded rigid nylon hingesas easy install asheavy duty hinges ideal flash free lockedthe small thej1/ scale applications checked forft[heavy duty hinges-They use removable 00 0 smoothness thelCCAll have six.I-mj3/64 dia cotter pin 0 0 0 factory holes each-Zy sideformax- 000 imum holding 000 Cat No 1186 perpkg $100Cat No 116 6perpkg $110Cat No 257 CatNo 119lsperpkg $195Cat No 117 l5perpkgS249lsperpkg$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 7132141 316 145- 532 139 18 138 332 1371116 K V Heavy duty $1 00- 2 per set j----------------------------- $80 per set sets 014 HEAVY DUTY 4-40 BALL LINK Cat No 259 Shown actual size new hefty ball link pertect tor 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 Cat No 203$175-q~ E~yi1 /4 DUeBRO SNAP-ON BALL LINKS Bolt-on links threaded links links rivit shafts take care misalignment Tough nylon link snaps holds tight Excellent offset steering servo throttle hook-ups Cat No 180Bolt $ 85 Cat No 181Threaded $85 Cat No 182Rivit $85 DUeBRO PRODUCTS INC 480 Banner Road Wauconda Illinois 60084 insurance claims see September t982 column frequent insurance claim atready result models hitting vehicles Whether vehicles cars parked focal flying field dont knowhut assume least some Nevertheless safety barrier separates active flying area spectators and/or other modelers good ideaprovided flying never takes place behind barrier takes us letter received just before Christmas froim good friend left Wash ington DC area upon recent retirement now resides Idaho tetter included color slides Idaho clubs flying field showed 6-ft-high chain link fence between runway pit area intended safety barrier friend states - seems work psychological deterrent rather bul wark stop low-flying models Most fly ing done front pits 3600-flying unheard Flying over pits parking allowed strongly disagree 3600-flying club members feel poses no prob lem wide-open spaces fly agree friend flying behind pits parking area safe practice such activity also violation previously mentioned AMA suggested field layout guidelines Editors note kind flying also violation AMA Safety Code Dont RBM another subjectenergy Ni-Cd bat teries letter Jesse Aronstein Pough keepsie NY reported rather unusual occurrence quote Most RC aircraft have batteries board will provide considerable energy short circuit occurs personally experience made point quite vividly sent flight pack manufacturer service fresh charge 550 mAh batteries system retumed new battery pack wiring sent old pack back explanation received shorted condition Inspec tion showed wiring switch internal parts switch shorted resulting insulation wires between switch battery being charred melted battery case showed signs very high temperature wire exit hole Fortunately no fire occurred No post office postal delivery truck burned result incident potential fire ignition clearly evident however lesson learned little cost' Some years back read report incident may have similar cause related Jesse report alleged brand new RC system purchased hobby store during trip store purchasers home battery pack shorted caused fire partially consumed station wagon being transported have no means confirming fire really started shorted battery pack does seem charged Ni-Cd pack has sufficient energy ignition source should become shorted routine check wiring harnesses switches would seem order subject switches recently read safety-related article clubs newsletter touched topic However some what puzzled about reasoning behind ad vice gave article stated Another safety item ON-OFF switch receiver must mount switch fuselage side aircraft should method ically check operation prior flight Con flnued page 118 14 Model Aviation Top Quality Name Can Depend _______NEW________ Safety/Preston Continued oaae 14 best spot mount switch servo tray inside fuselage most always switeh fails mounted side fuse majority radio manufacturers pro vide servo trays have location mounting switch articles weve seen instruct beginners install radio show receiver switch located fuselage side would like ask readers opin ion switch mounted way prone failure mounted servo tray rationale can think would cause premature failure switch fuselage side increased likelihood contacts may become dirty seems like forever mentioning something about hazards propellers letter Murray Granshack included propeller safety tip sure whether have previously mentioned Another hint about safety wood props tighten prop nut too much thereby crush wood center causing prop blades fly off two directions engine running think lot beginners tend suggest dont already own four-way prop wrench should buy chance overtightening prop nut will creased use six- seven-in -long openended wrench rather shorter four-way wrench Similarly using AMAstyle acom prop nut requires 5/32-in dia meter steel rod tightening keep length rod about four five Another letter subject props comes Phillip Nickell Longmont CO Phillip included some charts formulas give prop tip speed theoretical forward speed model respect prop diameter rpm prop pitch Since forward travel speed given prop pitch rpm somewhat con troversial issue going touch However including chart illustrates prop tip speed range prop diameters rpms Perhaps next time tweak needle valve ultimate top-end per formance will think about speed piece wood plastic thats fraction inch away fingers subject prop tip speed did ever think about prop noiseproducing component model recently attended AMA Executive Council meeting Ed Izzo VP District chairman AMAs Noise Committee talked about suppression model aircraft noise com mittee has constructed quiet Pattem model features among other things three-bladed prop reducing prop diameter adding extra blade can move same amount air some given rpm reduction prop tip speed consequent reduction prop noise Since us use ineffective mufflers hear engine exhaust noise According Ed engine exhaust noise easiest thing reduce quest tranquility flying field Muffler manufacturers take note some products sell under label muffler nothing short joke opinion writer long overdue establishing maxi mum sound output levels model aircraft en gines Perhaps Eds committee will help achiev ing goal Since previous paragraph has probably made us public enemy No muffler manufac turers lets see can upset few model maga zine publishers too exception MAs however Ron Sebosky Advance NC sent us clipping recent issue model magazines no MA part construction article RC Scale model author article stated fact often fly local super market parking lot agree Ron such flying site leaves something desired safety point view might prudent publishers magazines delete such statements made contributors lest others get idea club should solve flying site problems moving parking lot local supermarket chain True model con struction article small 38-in -winspan /2A power could still cause serious injury should hit person could totally unaware parking lot being used airport rather just place parking ones car last item round out months epistle comes Flight Line News newsletter Conejo RC Modelers edited Art Addington title Safety First Flight Courtesy Some time ago adopted rule first flight aircraft would done solono other aircraft sky As rules go has slowly lost its presence result ero sion evident two weeks ago young man asked would help him first flight did safety check took wing off another flier check controls make sure properly rigged Two other fliers up takeoff little wild nose steering too sensitive say least made ourselves known other two fliers plane far out trim would climb idle very little roll control landed plane deadstick pushing forward elevator control little work pits another flier helped put new plane up takeoff scared H--- out other flier up new model almost hit him did same thing twice trying land fliers comment dont put plane pits leave Good advice Leave until can fly its lonesome leamed lesson hope telling will save accident also hope relating story column other clubs might give some thought requirement first-flights model should performed no others air Have safe month John Preston 7012 Elvira Ct Foils Church VA 22042 Piper Cub J-3/Reese Continued paqe 28 cranks drill down through outer hole bellerank 1/16-in drill through balsa bottom drill running rotate bellerank gently cut curved slot pushrod exit Build wing center section stacking ribs spar joiners 1/16-in balsa bottom Trial-fit wing panels center section everything fits easily add top 1/16 sheeting center sec tion Epoxy wing panels center blocking up wing tip /2 Use 1 under tip dont use ailerons 118 Model Aviation Nick GIANT RIC SCALt f-LAN DESIGNS 2 4 Cu size Engines AT6 TEXAN24 1101 Span$2700pp uSA POKKER DR127 I63 TIp$2500pp USA FIF BEARCAT2/ 166 Span$2700pp USA CURTISS P-4024 19C Span$2700pp USA FALl CORSAIR2 192 Span$2700pp USA Fiberglass Cowlings & Canopies available also send slamp far derailed bocbureS an Gianl scale Accessarles Oar Plans ned Poslpaid wilbin Ibe u5Al 0. S
Edition: Model Aviation - 1983/04
Page Numbers: 12, 14, 118
____first SgItws Its spring safetycheckup time Ni-Cd batteries RC models wiring harnesses potential fire-hazards Portable safety barriers Some tips prop safety suggestion RC clubs respect first flights new models John Preston AS WE BEGIN column 1983 three days old However since will included April issue Model Aviotion will reading sometime around end February beginning March its little late wishing Happy New Year spring just around corner will wish happy safe new flying season hang up equipment duration winter perhaps few reminders might order before rush out flying field try destroy what spent winter creating RC flier last time radios checked qualified technician very least batteries should cycled determine condition lucky enough receive new radio Santa would well-advised run bat teries through discharge cycle Virtually nothing buy can guaranteed 100% free defects batteries check out OK remember jot down time took go full charge point discharger shut off Use baseline future reference models flew times dur ing 1982 should also receive going-over Are control surface hinges still secure somewhat ratty fuel-soaked might good time replace some same might apply fuel tank and/or tubing will assume took time last fall thor oughly clean up engines give liberal dose rust-inhibiting oil RCers should take s close look installation servos pushrods Are servo mounting rails still se cure did glue joint let go sometime during last year addition being safety risk model crashes can expensive An ounce prevention worth pound cure Its since mentioned RC Heli copters column receive very little mail 12 Model Aviation PROP RPM thousands 6789 10 11 12 13 34 15 16 17 181920 U 10 ul 11 12 13 14 O 15 0 16 0 17 0 18 107 125 143 161 178 196 214 232 250 268 286 303 321 125 146 167 187 208 229 250 271 292 312 333 354 375 143 161 167 187 190 214 214 241 238 268 262 295 286 321 309 348 333 375 357 402 381 428 405 455 428 482 178196214232250268286303321339357 208229250271292312333354375396416 238262286309333357381405428452476 268295321348375402428455482509535 297327357387416446476506535565595 327360393425458491524556589622654 357393428464500535571607643678714 387425464503541580619657696735773 416458500541583625666708750791833 446491535580625669714759803848892 476524571619666714762809857904952 5065566076577087598098609109611011 53558964369675080385791096410171071 Note Tip speedS equal exceed Mach number region sea ievel conditionsapproximate regarding strange machines rotating wings may mean either safety record better fixed-wing models number being flown small very few incidents involving injury associated model choppers however incident involving RC Helicopter reported District VIII VPs column Ted White February 1983 issue magazine ac count Teds column written victim received severe blow chest arms caused main rotor blades parting company hub Since Helicopters tend flown closer people fixed-wing models aware potential hazard still have February magazine Henry Haffkes Gee Bee R-l cover take time read Teds column page 105 Pennsylvania modeler recently telephone conversation ihe associate editor magazine subject Portable Safety Bar riers modeler commenting AMAs suggested field layout guidelines locate parking area 80 ft back edge runway modeler suggested cars can very effective portable safety barriers might better located closer scene activity doubt AMAs insurance carrier would too excited suggestion Based information thai received last year regarding Continued page 14 AAk iiis MAVBE 14ELL CxO AWAY IF WE cxlJ-r LOOK AT 1411A PROP TIP SPEED IN MPH 440 STEEL KWIK-LINKS P 4 40 links con structed top quality spring steel control linkage hook-ups Cat No 3042 $100 DU-BRO 4-40 KWIK-LINKS 12 rod included / / Cat No 306$ 75 ea NEKEL PLATED SOLDER LINKS new 4-40 solder links nickel plated tor easy soldering Cat No 305 2 $100 SMALL NYLON HINGESSTANDARD NYLONHINGESHEAVY DUTY e HINGES Easy install precisionStrong smooth andBuilt heavy load DUBFlO molded rigid nylon hingesas easy install asheavy duty hinges ideal flash free lockedthe small thej1/ scale applications checked forft[heavy duty hinges-They use removable 00 0 smoothness thelCCAll have six.I-mj3/64 dia cotter pin 0 0 0 factory holes each-Zy sideformax- 000 imum holding 000 Cat No 1186 perpkg $100Cat No 116 6perpkg $110Cat No 257 CatNo 119lsperpkg $195Cat No 117 l5perpkgS249lsperpkg$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 7132141 316 145- 532 139 18 138 332 1371116 K V Heavy duty $1 00- 2 per set j----------------------------- $80 per set sets 014 HEAVY DUTY 4-40 BALL LINK Cat No 259 Shown actual size new hefty ball link pertect tor 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 Cat No 203$175-q~ E~yi1 /4 DUeBRO SNAP-ON BALL LINKS Bolt-on links threaded links links rivit shafts take care misalignment Tough nylon link snaps holds tight Excellent offset steering servo throttle hook-ups Cat No 180Bolt $ 85 Cat No 181Threaded $85 Cat No 182Rivit $85 DUeBRO PRODUCTS INC 480 Banner Road Wauconda Illinois 60084 insurance claims see September t982 column frequent insurance claim atready result models hitting vehicles Whether vehicles cars parked focal flying field dont knowhut assume least some Nevertheless safety barrier separates active flying area spectators and/or other modelers good ideaprovided flying never takes place behind barrier takes us letter received just before Christmas froim good friend left Wash ington DC area upon recent retirement now resides Idaho tetter included color slides Idaho clubs flying field showed 6-ft-high chain link fence between runway pit area intended safety barrier friend states - seems work psychological deterrent rather bul wark stop low-flying models Most fly ing done front pits 3600-flying unheard Flying over pits parking allowed strongly disagree 3600-flying club members feel poses no prob lem wide-open spaces fly agree friend flying behind pits parking area safe practice such activity also violation previously mentioned AMA suggested field layout guidelines Editors note kind flying also violation AMA Safety Code Dont RBM another subjectenergy Ni-Cd bat teries letter Jesse Aronstein Pough keepsie NY reported rather unusual occurrence quote Most RC aircraft have batteries board will provide considerable energy short circuit occurs personally experience made point quite vividly sent flight pack manufacturer service fresh charge 550 mAh batteries system retumed new battery pack wiring sent old pack back explanation received shorted condition Inspec tion showed wiring switch internal parts switch shorted resulting insulation wires between switch battery being charred melted battery case showed signs very high temperature wire exit hole Fortunately no fire occurred No post office postal delivery truck burned result incident potential fire ignition clearly evident however lesson learned little cost' Some years back read report incident may have similar cause related Jesse report alleged brand new RC system purchased hobby store during trip store purchasers home battery pack shorted caused fire partially consumed station wagon being transported have no means confirming fire really started shorted battery pack does seem charged Ni-Cd pack has sufficient energy ignition source should become shorted routine check wiring harnesses switches would seem order subject switches recently read safety-related article clubs newsletter touched topic However some what puzzled about reasoning behind ad vice gave article stated Another safety item ON-OFF switch receiver must mount switch fuselage side aircraft should method ically check operation prior flight Con flnued page 118 14 Model Aviation Top Quality Name Can Depend _______NEW________ Safety/Preston Continued oaae 14 best spot mount switch servo tray inside fuselage most always switeh fails mounted side fuse majority radio manufacturers pro vide servo trays have location mounting switch articles weve seen instruct beginners install radio show receiver switch located fuselage side would like ask readers opin ion switch mounted way prone failure mounted servo tray rationale can think would cause premature failure switch fuselage side increased likelihood contacts may become dirty seems like forever mentioning something about hazards propellers letter Murray Granshack included propeller safety tip sure whether have previously mentioned Another hint about safety wood props tighten prop nut too much thereby crush wood center causing prop blades fly off two directions engine running think lot beginners tend suggest dont already own four-way prop wrench should buy chance overtightening prop nut will creased use six- seven-in -long openended wrench rather shorter four-way wrench Similarly using AMAstyle acom prop nut requires 5/32-in dia meter steel rod tightening keep length rod about four five Another letter subject props comes Phillip Nickell Longmont CO Phillip included some charts formulas give prop tip speed theoretical forward speed model respect prop diameter rpm prop pitch Since forward travel speed given prop pitch rpm somewhat con troversial issue going touch However including chart illustrates prop tip speed range prop diameters rpms Perhaps next time tweak needle valve ultimate top-end per formance will think about speed piece wood plastic thats fraction inch away fingers subject prop tip speed did ever think about prop noiseproducing component model recently attended AMA Executive Council meeting Ed Izzo VP District chairman AMAs Noise Committee talked about suppression model aircraft noise com mittee has constructed quiet Pattem model features among other things three-bladed prop reducing prop diameter adding extra blade can move same amount air some given rpm reduction prop tip speed consequent reduction prop noise Since us use ineffective mufflers hear engine exhaust noise According Ed engine exhaust noise easiest thing reduce quest tranquility flying field Muffler manufacturers take note some products sell under label muffler nothing short joke opinion writer long overdue establishing maxi mum sound output levels model aircraft en gines Perhaps Eds committee will help achiev ing goal Since previous paragraph has probably made us public enemy No muffler manufac turers lets see can upset few model maga zine publishers too exception MAs however Ron Sebosky Advance NC sent us clipping recent issue model magazines no MA part construction article RC Scale model author article stated fact often fly local super market parking lot agree Ron such flying site leaves something desired safety point view might prudent publishers magazines delete such statements made contributors lest others get idea club should solve flying site problems moving parking lot local supermarket chain True model con struction article small 38-in -winspan /2A power could still cause serious injury should hit person could totally unaware parking lot being used airport rather just place parking ones car last item round out months epistle comes Flight Line News newsletter Conejo RC Modelers edited Art Addington title Safety First Flight Courtesy Some time ago adopted rule first flight aircraft would done solono other aircraft sky As rules go has slowly lost its presence result ero sion evident two weeks ago young man asked would help him first flight did safety check took wing off another flier check controls make sure properly rigged Two other fliers up takeoff little wild nose steering too sensitive say least made ourselves known other two fliers plane far out trim would climb idle very little roll control landed plane deadstick pushing forward elevator control little work pits another flier helped put new plane up takeoff scared H--- out other flier up new model almost hit him did same thing twice trying land fliers comment dont put plane pits leave Good advice Leave until can fly its lonesome leamed lesson hope telling will save accident also hope relating story column other clubs might give some thought requirement first-flights model should performed no others air Have safe month John Preston 7012 Elvira Ct Foils Church VA 22042 Piper Cub J-3/Reese Continued paqe 28 cranks drill down through outer hole bellerank 1/16-in drill through balsa bottom drill running rotate bellerank gently cut curved slot pushrod exit Build wing center section stacking ribs spar joiners 1/16-in balsa bottom Trial-fit wing panels center section everything fits easily add top 1/16 sheeting center sec tion Epoxy wing panels center blocking up wing tip /2 Use 1 under tip dont use ailerons 118 Model Aviation Nick GIANT RIC SCALt f-LAN DESIGNS 2 4 Cu size Engines AT6 TEXAN24 1101 Span$2700pp uSA POKKER DR127 I63 TIp$2500pp USA FIF BEARCAT2/ 166 Span$2700pp USA CURTISS P-4024 19C Span$2700pp USA FALl CORSAIR2 192 Span$2700pp USA Fiberglass Cowlings & Canopies available also send slamp far derailed bocbureS an Gianl scale Accessarles Oar Plans ned Poslpaid wilbin Ibe u5Al 0. 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