WE Satfig wuwsTiESV w Sailplanes can getcha Big RC mod els need heavy-duty RC system wiring youre running model engine youve got con stantly alert No stu pidity allowed John Preston BEFORE getting discussion con tents last months mailbag let point home ad dress used ap pear end Safety column no longer valid Ive movedtemporarilyto apartment until new home completed sometime spring Meanwhile mail Safety Comes First should sent magazine marked attention Lets start months Safety column subject RC Sailplanes Perhaps absence noise generally slower ti ight characteristics engine-powered RC models would lead forgetting being hit Sailplane could result injury Just remember world speed record RC model aircraft established RC Sailplane Anyway back correspondence Two letters phone call during last month subject engineless models First phone call Unfortuntely caller must remain anonymous notes made somewhere cardboard boxa victim recent move memory names isnt what used seems modeler area competed number Sailplane contests during past summer regularly crashed entry areas occupied contestants and/or spectators phone caller wanted some advice what could done prevent happening future example can contestant barred entering contest because lack flying proficiency Good question standards estab lish acceptable level flying pro ficiency after entering contest fly ing first round contestant observed CD guilty infraction good safety practice pro cedure could disqualified stated AMA rule book Section 1 Paragraph 17 However Im aware provision would permit CD exclude contestant contest merely because crashed model previous contests response phone caller regard safety spectators other con testants Sailplane contests point out models flown over people unlikely crash people event modeler loses control Unfortunately models being flown Sailplane contests will frequently pass over spectator pit areas appears practice will result disqualification un sportsmanlike conduct hazardous flying over controlled spectator area takes place rule book doesnt tell us determined contests engine-powered RC models flying over controlled spectator areas defined haz ardous will generally result dis qualification flight during occurs Perhaps should also case contests RC Sailplanes Any com ments Sailplane fliers will wel comed case Sailplane fliers feel Im being unfair suggesting shouldnt fly over people perhaps fol lowing account appeared news letter North County Clouds Sailplane Club may illustrate what can happen severe crash occurred pits plane experienced radio failure dove very high speed straight ground exploding impact wing near root struck Bob Williams forearm resting arm chair has large lump nasty bruise foot different direction might have killed Im alarmist scenario must mentioned Flying over pits anything less launch height cannot condoned Common sense seems have way being forgotten heat com petition especially setting up pre cision landing approach Im sure writer pre ceding tale seems condone flying over pits launch height safer high altitude receiver batteries roll over play dead9 opinion Before leaving subject RC Sailplanes letter Rick McCullum Salem IL warns us another way might struck RC Sail plane last contest incident occurred put scare flight about 530 going six minutes hollered Coming did 15-second circle entered pattern did downwind base turned onto final Continued page 14 12 Model Aviation 7 TUSE RU5&ER EANDS NEEI 10 E PLACEV thereb beholdwere pilot timer landing circle measuring landing couldnt have better bead Joes head Fortunately able give plane some Up get over people still get 45 landing points did ever utter naughty word apologize earshotlike East St Louis Perhaps easiest way offer com ment Ricks story quote para graph rule book deals landing points RC Sailplane event 125 The retrieval model landing area must done extreme caution utmost dispatch measurement required position nose model may marked model removed measurement may performed later safer time Ricks case timer new job gave no warning peo ple landing circle Sailplane pilot does have assistant timer should take duty warning pilot and/or retrievers other models conflict developing Turning Sailplanes subject big models following warning re ceived Ralph Warner Radio Con trolled Models Inc RAM makers number safety devices RC fliers WARNING BIG MODELS REQUIRE BIG WIRES Have some unusual radio glitches maneuvered through various stunts Are suspicious servos very sluggish high loads placed Has model crashed because unable recover high-airload maneuver Radio servo problems can caused limited conducting ability stan dard No 24 No 26 gauge hook-up wire commonly used radio systems Typical high-power servos draw amp start movement Airloads large surfaces especially elevators can easily double amperage demand Simultaneous servo operation places ad ditional load wires circuit Dis tant servos automatically suffer current loss due restriction through conducting wires Current demand under airload can high eight amps tests show voltage available through various gauges quality stranded hook-up wire shown below using standard 48 volt Ni-Cd pack two-amp load servo circuit Voltage Available Wire Wire GaugeLength 1 Ft 3Ft 6Ft 26464 V437 V384 V 24470 V450 V420 V 22473 V461 V442 V 20476 V466 V454 V 18477 V473 V465 V Continued page 16 14 Model Aviation conclusion obvious expect get sufficient current through system servos will function designed voltage spikes wont glitch receiver must use least No 20 gauge wire throughout system means need heavy wire starting cells receiver pack heavy duty switch harnesses especially wire going distant servos Dont think high-amp receiver pack will solve prob lem Only sufficiently large wire able conduct current distant locations supply high demand feel havent suffered problems described dont misled model critical low-level attitude requires full servo power time battery wir ing circuit wont able deliver Since Im neither flier big models nor electrical engineer must accept Ralphs warning fact Im passing consideration next time install radio system big model As final topic month return favorite subjectpropellers lengthy letter received Marvin Denny Wichita KS Im reprinting its en tirety Some Marvins suggestions procedures should followed order prevent propeller accidents have stated column previously However dont think can ever say too much about hazard rotating props Over Marvin have two subjects would like bring attention serious safety hazards inherent hobby Although both occurrences happened Control Line activities equally applicable other fields powered model aviation first incident happened recently during break-in test bench glow engine 36 size initial start what thought good propeller blade came off either due bad grain wood because plug leads got prop happened fast dont know whether battery clip came off broke prop blade slung off resulting vibration shook clip off just started engine moving around front hazardous place rear just point line prop arc accident occurred Fortunately wearing safety glasses time blade struck lens left side inflicting deep scratch glass ap proximately 3/s-in long glass did break deflected blade such surrounding skin scratched point careful place yourself front running engine can dangerous place during transition dangerous place safe place So safetys sake always careful wear safety equipmentin case glasses incident started thinking Continued page 123 16 Model Aviation WITH FEATURES YOU THE MODELER WANTED 24 insignia sheets also letters numbers 0 majardecals available popular 40- 6Qsizes plus American Giant Scale size believe majardecals have comprehensive assortment available now -with sizes styles coming time pressure sensitive water transfer Well bet line handing line.the complete line decals available model anywhere ___@0 youll love being handed major decals D s bu o s nqu ries nv ted TEL 413 525 410 cONTAcT YOUR LOCAL HOBBY SHOP OR WRITE DIRECT NORTHEAST SCREEN GRAPHICS 21 FISHER AVE. EAST LONOMEASOW MA 01028 small portion threepage letter Bill wrotemostly concerning experiences CL modeling near close WW II afterwards Its fascinating stuff Weve invited him write feature article about CL modeling era Safety/Preston Continued oaoe 16 results thoughts First front engine start Hold ing battery clip left hand reaching around prop arc exhaust side flipping prop right hand normal Hazard number What happens engine starts slip am caused move right left forearm wrist very close proximity whirling prop should use battery clip does require physical holding stay connected Hazard number two Did check prop tightness Loose props broken crankshafts engines coming out test mount go forward dont stay front running engine Always double check prop tightness use engine test stand strong enough handle size engine runningdouble check securing engine being firmly bolted down Third hazard moving front engine back thrown prop blades broken prop blades items hitting blades thrown out sides often great velocity Make transition front rear quickly possible linger line prop arc check prop blade tracking other Hazard number four Has prop tip painted contrasting visible color turning outer edge prop arc can seen should painted back about bright ye low red white engine running prop arc will visible Hazard number five monitoring running engine behind remember gravel small items can picked up prop blast propelled rearward enough force cause eye damage sure gravel debris small items cleared away engine test stand area before starting engine Hazard number six adjusting needle valve new engine during breakin should careful engine often runs erratically surges making diffi cult get secure hold needle valve front-intake engine surging could cause get fingers prop needle hard turn would safer shut engine down make adjustments Hazard number seven After shut-down engine often very hot Placing hands engine right after shut-down could result painful burns Dont touch engine just after shut-down see hot Hazard number eight common prac tice flip propeller through several times right after engine quits break-in runs get better cool-down warpage cases cylinders careful engine often hot enough restart fire benefit hooking up battery Flip prop respect would give fuel engine battery hooked up above-listed eight hazards jumped up bit tunate have worn safety glasses got attention enough make think hazards involved routine project simple breaking-in new engine am sure other dangerous things did mention two common causes accidents negligence stupidity PS read son also competitor said Dad missed couple told missed cut fingers hand-cranking new engines Theyre often very tight seize bind first couple starts fact along propellers have very sharp trailing edges often leads severely lacer ated fingers should use wood pro pellers during break-in sure both blades have blunted leading trailing edges Blunted edges espe cially necessary using plastic nylon fiberglass-type props other item mentioned physi cally painful just important sonoise Ear damage cumulative insidious sneaks up fore realize permanent damage can incurred should use mufflers ear muffs ear plugs protect ears second accident happened actually occurred several years ago recently reminded seeing other modeler almost having identical ac cident hazard caused byand herent withmulti-engine aircraft scale model B-29 four Enya 19 engines agreed fly exhibition flight Dumas TX Saturday afternoon whats new waited until morning get model ready hadnt flown run recently drove over Dumas about noon leaving little time prepare flying site After getting engine run-in site getting everything else ready sup posedly moved plane circle Now time essence tie up circle excessive amount time Helpers consisted man holding plane fuselage tail man behind wing move booster bat tery engine engine myself front plane starting engines Plenty help right Now plot got sticky engines running smoothly run indi vidually just prior remember both wing men moved fuel boosters other equipment clear plane Now Continued page 126 March 1984 123 holder near plane sud denly No 2 engine inboard engine left wing started sag due trash cold castor something fuel instinc tively reached around No 2 engine pro peller quickly adjust needleright through No 1 propeller screaming full bore Ow Extremely severe lacerations incurred back right hand impact killed No 1 No 2 died anyway wing helpers came over killed No 3 No 4 did later complete exhibition flight though considerable pain wrapped hand myself didnt go doctor until Mondayand after noticed some unusual bone movement placed little pressure fingers right hand Lets look what caused accident First delayed getting plane ready until last day didnt have act together second didnt give myself enough time day demo too much hurry third too much concerned tying up circle too long preoccupied fourth coordinated helpers should what therefore leaving insufficient help up until launch fifth stupidity previous four items re sulted wrong move could have let die got helper back restarted Fifth stupidity again though knew injured quite badly bleeding long deep gashes back hand deep pain armpit slight nausea neglected go doctor have treated also told stupid analysis going some thing used doing regu larly prepare well advance let desire get job done cause hurry point forgetting careful Al ways coordinate helpers will know what sure have enough help last probably important have ac cident injured self-diagnose injuries doubt serious see doctor should constantly aware adja cent engines running hand-starting careful get running engine either starting flip passing through after flip best use electric starter multi-engine air craft Marvin included pictures scratched safety glasses letter However came time write column couldnt find have recently moved new home will no doubt remember takes find everything again Have safe month John Preston Model Aviation 1810 Samuel Morse Dr Reston VA 22090 Fun/Winter Continued page 28 used 11-8 prop though manufac turer Leisure recommends 11-7 LeCrate seven cells 41 oz 134 wing loading should 1006 accord ing formula Thats exact average dont come up formulas prediction something wronglike prop cant go Dons prop work too much relates best propel ler diameter airplane flight speed wing loading LeCrate 12 14 An efficient pitch/diameter figure region 60 70% indicating 7 10-in pitch am using 11-7/2 Rev-Up 21/21 reduction am now flying 12-7 deBolt-modified Y-O seven cells 381 reduction guessing right direction glide find LeCrate two different airplanes depending whether use direct drive reduction drive because dont have folder 21/21 381 larger props really change glide seven cells glide faster Thats wing loading factor work though terms max duration important advantage battery weight prop free* * Long Engine Life * * Use BRU LINE Air Cleaner Completely Fuel Proof Nylon Rubber Parts Cat No 102 Air Cleaner Coarse $225 Cat No 202 Air Cleaner Fine $225 Replacement Inserts Cat No 104 Pk/2 Inserts Coarse $195 Cat No204 Pk/2 Inserts Fine $195 FITS MOST ENGINES 25 UP SEE YOUR LOCAL HOBBY DEALER IF UNAVAILABLE LOCALLY SEND TO Add 75 shippingMichigan residents add 4% sales tax Bru Line Industries Inc PO Box 3786 Center Line Michigan 48015 U orasriU man nru lar inquIres/For. ncr .nisnfls ROOKIE Super beginner di 60 wing span $2799 CITARRIA65 wing span25-40 power$3399 SCALE KITS CHAMPION CITABRIA Owing span 60 pwr & up $6499 BUD NOSEN TRAINER 102 wing span 60 pwr-up $5599 PIPER CUP J3 9 wing span 60 power & up $7588 P51-B 102 wing span quadra power $10899 P-5 1-0 102 wing span quadra power $10899 1933 GERE SPORT 8 wing span 60 power & up $8999 CESSNA 310 TWIN lOwing span twin 60 pwr $12299 MR MULLIGAN 9 wing span 60 power $8499 F4-U CORSAIR 109 wing span quadra powerwrite/caII Other kits & accessories available for price Catalog $200 126 Model Aviation Safety/Preston Continued page 123
Edition: Model Aviation - 1984/03
Page Numbers: 12, 14, 16, 123, 126
WE Satfig wuwsTiESV w Sailplanes can getcha Big RC mod els need heavy-duty RC system wiring youre running model engine youve got con stantly alert No stu pidity allowed John Preston BEFORE getting discussion con tents last months mailbag let point home ad dress used ap pear end Safety column no longer valid Ive movedtemporarilyto apartment until new home completed sometime spring Meanwhile mail Safety Comes First should sent magazine marked attention Lets start months Safety column subject RC Sailplanes Perhaps absence noise generally slower ti ight characteristics engine-powered RC models would lead forgetting being hit Sailplane could result injury Just remember world speed record RC model aircraft established RC Sailplane Anyway back correspondence Two letters phone call during last month subject engineless models First phone call Unfortuntely caller must remain anonymous notes made somewhere cardboard boxa victim recent move memory names isnt what used seems modeler area competed number Sailplane contests during past summer regularly crashed entry areas occupied contestants and/or spectators phone caller wanted some advice what could done prevent happening future example can contestant barred entering contest because lack flying proficiency Good question standards estab lish acceptable level flying pro ficiency after entering contest fly ing first round contestant observed CD guilty infraction good safety practice pro cedure could disqualified stated AMA rule book Section 1 Paragraph 17 However Im aware provision would permit CD exclude contestant contest merely because crashed model previous contests response phone caller regard safety spectators other con testants Sailplane contests point out models flown over people unlikely crash people event modeler loses control Unfortunately models being flown Sailplane contests will frequently pass over spectator pit areas appears practice will result disqualification un sportsmanlike conduct hazardous flying over controlled spectator area takes place rule book doesnt tell us determined contests engine-powered RC models flying over controlled spectator areas defined haz ardous will generally result dis qualification flight during occurs Perhaps should also case contests RC Sailplanes Any com ments Sailplane fliers will wel comed case Sailplane fliers feel Im being unfair suggesting shouldnt fly over people perhaps fol lowing account appeared news letter North County Clouds Sailplane Club may illustrate what can happen severe crash occurred pits plane experienced radio failure dove very high speed straight ground exploding impact wing near root struck Bob Williams forearm resting arm chair has large lump nasty bruise foot different direction might have killed Im alarmist scenario must mentioned Flying over pits anything less launch height cannot condoned Common sense seems have way being forgotten heat com petition especially setting up pre cision landing approach Im sure writer pre ceding tale seems condone flying over pits launch height safer high altitude receiver batteries roll over play dead9 opinion Before leaving subject RC Sailplanes letter Rick McCullum Salem IL warns us another way might struck RC Sail plane last contest incident occurred put scare flight about 530 going six minutes hollered Coming did 15-second circle entered pattern did downwind base turned onto final Continued page 14 12 Model Aviation 7 TUSE RU5&ER EANDS NEEI 10 E PLACEV thereb beholdwere pilot timer landing circle measuring landing couldnt have better bead Joes head Fortunately able give plane some Up get over people still get 45 landing points did ever utter naughty word apologize earshotlike East St Louis Perhaps easiest way offer com ment Ricks story quote para graph rule book deals landing points RC Sailplane event 125 The retrieval model landing area must done extreme caution utmost dispatch measurement required position nose model may marked model removed measurement may performed later safer time Ricks case timer new job gave no warning peo ple landing circle Sailplane pilot does have assistant timer should take duty warning pilot and/or retrievers other models conflict developing Turning Sailplanes subject big models following warning re ceived Ralph Warner Radio Con trolled Models Inc RAM makers number safety devices RC fliers WARNING BIG MODELS REQUIRE BIG WIRES Have some unusual radio glitches maneuvered through various stunts Are suspicious servos very sluggish high loads placed Has model crashed because unable recover high-airload maneuver Radio servo problems can caused limited conducting ability stan dard No 24 No 26 gauge hook-up wire commonly used radio systems Typical high-power servos draw amp start movement Airloads large surfaces especially elevators can easily double amperage demand Simultaneous servo operation places ad ditional load wires circuit Dis tant servos automatically suffer current loss due restriction through conducting wires Current demand under airload can high eight amps tests show voltage available through various gauges quality stranded hook-up wire shown below using standard 48 volt Ni-Cd pack two-amp load servo circuit Voltage Available Wire Wire GaugeLength 1 Ft 3Ft 6Ft 26464 V437 V384 V 24470 V450 V420 V 22473 V461 V442 V 20476 V466 V454 V 18477 V473 V465 V Continued page 16 14 Model Aviation conclusion obvious expect get sufficient current through system servos will function designed voltage spikes wont glitch receiver must use least No 20 gauge wire throughout system means need heavy wire starting cells receiver pack heavy duty switch harnesses especially wire going distant servos Dont think high-amp receiver pack will solve prob lem Only sufficiently large wire able conduct current distant locations supply high demand feel havent suffered problems described dont misled model critical low-level attitude requires full servo power time battery wir ing circuit wont able deliver Since Im neither flier big models nor electrical engineer must accept Ralphs warning fact Im passing consideration next time install radio system big model As final topic month return favorite subjectpropellers lengthy letter received Marvin Denny Wichita KS Im reprinting its en tirety Some Marvins suggestions procedures should followed order prevent propeller accidents have stated column previously However dont think can ever say too much about hazard rotating props Over Marvin have two subjects would like bring attention serious safety hazards inherent hobby Although both occurrences happened Control Line activities equally applicable other fields powered model aviation first incident happened recently during break-in test bench glow engine 36 size initial start what thought good propeller blade came off either due bad grain wood because plug leads got prop happened fast dont know whether battery clip came off broke prop blade slung off resulting vibration shook clip off just started engine moving around front hazardous place rear just point line prop arc accident occurred Fortunately wearing safety glasses time blade struck lens left side inflicting deep scratch glass ap proximately 3/s-in long glass did break deflected blade such surrounding skin scratched point careful place yourself front running engine can dangerous place during transition dangerous place safe place So safetys sake always careful wear safety equipmentin case glasses incident started thinking Continued page 123 16 Model Aviation WITH FEATURES YOU THE MODELER WANTED 24 insignia sheets also letters numbers 0 majardecals available popular 40- 6Qsizes plus American Giant Scale size believe majardecals have comprehensive assortment available now -with sizes styles coming time pressure sensitive water transfer Well bet line handing line.the complete line decals available model anywhere ___@0 youll love being handed major decals D s bu o s nqu ries nv ted TEL 413 525 410 cONTAcT YOUR LOCAL HOBBY SHOP OR WRITE DIRECT NORTHEAST SCREEN GRAPHICS 21 FISHER AVE. EAST LONOMEASOW MA 01028 small portion threepage letter Bill wrotemostly concerning experiences CL modeling near close WW II afterwards Its fascinating stuff Weve invited him write feature article about CL modeling era Safety/Preston Continued oaoe 16 results thoughts First front engine start Hold ing battery clip left hand reaching around prop arc exhaust side flipping prop right hand normal Hazard number What happens engine starts slip am caused move right left forearm wrist very close proximity whirling prop should use battery clip does require physical holding stay connected Hazard number two Did check prop tightness Loose props broken crankshafts engines coming out test mount go forward dont stay front running engine Always double check prop tightness use engine test stand strong enough handle size engine runningdouble check securing engine being firmly bolted down Third hazard moving front engine back thrown prop blades broken prop blades items hitting blades thrown out sides often great velocity Make transition front rear quickly possible linger line prop arc check prop blade tracking other Hazard number four Has prop tip painted contrasting visible color turning outer edge prop arc can seen should painted back about bright ye low red white engine running prop arc will visible Hazard number five monitoring running engine behind remember gravel small items can picked up prop blast propelled rearward enough force cause eye damage sure gravel debris small items cleared away engine test stand area before starting engine Hazard number six adjusting needle valve new engine during breakin should careful engine often runs erratically surges making diffi cult get secure hold needle valve front-intake engine surging could cause get fingers prop needle hard turn would safer shut engine down make adjustments Hazard number seven After shut-down engine often very hot Placing hands engine right after shut-down could result painful burns Dont touch engine just after shut-down see hot Hazard number eight common prac tice flip propeller through several times right after engine quits break-in runs get better cool-down warpage cases cylinders careful engine often hot enough restart fire benefit hooking up battery Flip prop respect would give fuel engine battery hooked up above-listed eight hazards jumped up bit tunate have worn safety glasses got attention enough make think hazards involved routine project simple breaking-in new engine am sure other dangerous things did mention two common causes accidents negligence stupidity PS read son also competitor said Dad missed couple told missed cut fingers hand-cranking new engines Theyre often very tight seize bind first couple starts fact along propellers have very sharp trailing edges often leads severely lacer ated fingers should use wood pro pellers during break-in sure both blades have blunted leading trailing edges Blunted edges espe cially necessary using plastic nylon fiberglass-type props other item mentioned physi cally painful just important sonoise Ear damage cumulative insidious sneaks up fore realize permanent damage can incurred should use mufflers ear muffs ear plugs protect ears second accident happened actually occurred several years ago recently reminded seeing other modeler almost having identical ac cident hazard caused byand herent withmulti-engine aircraft scale model B-29 four Enya 19 engines agreed fly exhibition flight Dumas TX Saturday afternoon whats new waited until morning get model ready hadnt flown run recently drove over Dumas about noon leaving little time prepare flying site After getting engine run-in site getting everything else ready sup posedly moved plane circle Now time essence tie up circle excessive amount time Helpers consisted man holding plane fuselage tail man behind wing move booster bat tery engine engine myself front plane starting engines Plenty help right Now plot got sticky engines running smoothly run indi vidually just prior remember both wing men moved fuel boosters other equipment clear plane Now Continued page 126 March 1984 123 holder near plane sud denly No 2 engine inboard engine left wing started sag due trash cold castor something fuel instinc tively reached around No 2 engine pro peller quickly adjust needleright through No 1 propeller screaming full bore Ow Extremely severe lacerations incurred back right hand impact killed No 1 No 2 died anyway wing helpers came over killed No 3 No 4 did later complete exhibition flight though considerable pain wrapped hand myself didnt go doctor until Mondayand after noticed some unusual bone movement placed little pressure fingers right hand Lets look what caused accident First delayed getting plane ready until last day didnt have act together second didnt give myself enough time day demo too much hurry third too much concerned tying up circle too long preoccupied fourth coordinated helpers should what therefore leaving insufficient help up until launch fifth stupidity previous four items re sulted wrong move could have let die got helper back restarted Fifth stupidity again though knew injured quite badly bleeding long deep gashes back hand deep pain armpit slight nausea neglected go doctor have treated also told stupid analysis going some thing used doing regu larly prepare well advance let desire get job done cause hurry point forgetting careful Al ways coordinate helpers will know what sure have enough help last probably important have ac cident injured self-diagnose injuries doubt serious see doctor should constantly aware adja cent engines running hand-starting careful get running engine either starting flip passing through after flip best use electric starter multi-engine air craft Marvin included pictures scratched safety glasses letter However came time write column couldnt find have recently moved new home will no doubt remember takes find everything again Have safe month John Preston Model Aviation 1810 Samuel Morse Dr Reston VA 22090 Fun/Winter Continued page 28 used 11-8 prop though manufac turer Leisure recommends 11-7 LeCrate seven cells 41 oz 134 wing loading should 1006 accord ing formula Thats exact average dont come up formulas prediction something wronglike prop cant go Dons prop work too much relates best propel ler diameter airplane flight speed wing loading LeCrate 12 14 An efficient pitch/diameter figure region 60 70% indicating 7 10-in pitch am using 11-7/2 Rev-Up 21/21 reduction am now flying 12-7 deBolt-modified Y-O seven cells 381 reduction guessing right direction glide find LeCrate two different airplanes depending whether use direct drive reduction drive because dont have folder 21/21 381 larger props really change glide seven cells glide faster Thats wing loading factor work though terms max duration important advantage battery weight prop free* * Long Engine Life * * Use BRU LINE Air Cleaner Completely Fuel Proof Nylon Rubber Parts Cat No 102 Air Cleaner Coarse $225 Cat No 202 Air Cleaner Fine $225 Replacement Inserts Cat No 104 Pk/2 Inserts Coarse $195 Cat No204 Pk/2 Inserts Fine $195 FITS MOST ENGINES 25 UP SEE YOUR LOCAL HOBBY DEALER IF UNAVAILABLE LOCALLY SEND TO Add 75 shippingMichigan residents add 4% sales tax Bru Line Industries Inc PO Box 3786 Center Line Michigan 48015 U orasriU man nru lar inquIres/For. ncr .nisnfls ROOKIE Super beginner di 60 wing span $2799 CITARRIA65 wing span25-40 power$3399 SCALE KITS CHAMPION CITABRIA Owing span 60 pwr & up $6499 BUD NOSEN TRAINER 102 wing span 60 pwr-up $5599 PIPER CUP J3 9 wing span 60 power & up $7588 P51-B 102 wing span quadra power $10899 P-5 1-0 102 wing span quadra power $10899 1933 GERE SPORT 8 wing span 60 power & up $8999 CESSNA 310 TWIN lOwing span twin 60 pwr $12299 MR MULLIGAN 9 wing span 60 power $8499 F4-U CORSAIR 109 wing span quadra powerwrite/caII Other kits & accessories available for price Catalog $200 126 Model Aviation Safety/Preston Continued page 123
Edition: Model Aviation - 1984/03
Page Numbers: 12, 14, 16, 123, 126
WE Satfig wuwsTiESV w Sailplanes can getcha Big RC mod els need heavy-duty RC system wiring youre running model engine youve got con stantly alert No stu pidity allowed John Preston BEFORE getting discussion con tents last months mailbag let point home ad dress used ap pear end Safety column no longer valid Ive movedtemporarilyto apartment until new home completed sometime spring Meanwhile mail Safety Comes First should sent magazine marked attention Lets start months Safety column subject RC Sailplanes Perhaps absence noise generally slower ti ight characteristics engine-powered RC models would lead forgetting being hit Sailplane could result injury Just remember world speed record RC model aircraft established RC Sailplane Anyway back correspondence Two letters phone call during last month subject engineless models First phone call Unfortuntely caller must remain anonymous notes made somewhere cardboard boxa victim recent move memory names isnt what used seems modeler area competed number Sailplane contests during past summer regularly crashed entry areas occupied contestants and/or spectators phone caller wanted some advice what could done prevent happening future example can contestant barred entering contest because lack flying proficiency Good question standards estab lish acceptable level flying pro ficiency after entering contest fly ing first round contestant observed CD guilty infraction good safety practice pro cedure could disqualified stated AMA rule book Section 1 Paragraph 17 However Im aware provision would permit CD exclude contestant contest merely because crashed model previous contests response phone caller regard safety spectators other con testants Sailplane contests point out models flown over people unlikely crash people event modeler loses control Unfortunately models being flown Sailplane contests will frequently pass over spectator pit areas appears practice will result disqualification un sportsmanlike conduct hazardous flying over controlled spectator area takes place rule book doesnt tell us determined contests engine-powered RC models flying over controlled spectator areas defined haz ardous will generally result dis qualification flight during occurs Perhaps should also case contests RC Sailplanes Any com ments Sailplane fliers will wel comed case Sailplane fliers feel Im being unfair suggesting shouldnt fly over people perhaps fol lowing account appeared news letter North County Clouds Sailplane Club may illustrate what can happen severe crash occurred pits plane experienced radio failure dove very high speed straight ground exploding impact wing near root struck Bob Williams forearm resting arm chair has large lump nasty bruise foot different direction might have killed Im alarmist scenario must mentioned Flying over pits anything less launch height cannot condoned Common sense seems have way being forgotten heat com petition especially setting up pre cision landing approach Im sure writer pre ceding tale seems condone flying over pits launch height safer high altitude receiver batteries roll over play dead9 opinion Before leaving subject RC Sailplanes letter Rick McCullum Salem IL warns us another way might struck RC Sail plane last contest incident occurred put scare flight about 530 going six minutes hollered Coming did 15-second circle entered pattern did downwind base turned onto final Continued page 14 12 Model Aviation 7 TUSE RU5&ER EANDS NEEI 10 E PLACEV thereb beholdwere pilot timer landing circle measuring landing couldnt have better bead Joes head Fortunately able give plane some Up get over people still get 45 landing points did ever utter naughty word apologize earshotlike East St Louis Perhaps easiest way offer com ment Ricks story quote para graph rule book deals landing points RC Sailplane event 125 The retrieval model landing area must done extreme caution utmost dispatch measurement required position nose model may marked model removed measurement may performed later safer time Ricks case timer new job gave no warning peo ple landing circle Sailplane pilot does have assistant timer should take duty warning pilot and/or retrievers other models conflict developing Turning Sailplanes subject big models following warning re ceived Ralph Warner Radio Con trolled Models Inc RAM makers number safety devices RC fliers WARNING BIG MODELS REQUIRE BIG WIRES Have some unusual radio glitches maneuvered through various stunts Are suspicious servos very sluggish high loads placed Has model crashed because unable recover high-airload maneuver Radio servo problems can caused limited conducting ability stan dard No 24 No 26 gauge hook-up wire commonly used radio systems Typical high-power servos draw amp start movement Airloads large surfaces especially elevators can easily double amperage demand Simultaneous servo operation places ad ditional load wires circuit Dis tant servos automatically suffer current loss due restriction through conducting wires Current demand under airload can high eight amps tests show voltage available through various gauges quality stranded hook-up wire shown below using standard 48 volt Ni-Cd pack two-amp load servo circuit Voltage Available Wire Wire GaugeLength 1 Ft 3Ft 6Ft 26464 V437 V384 V 24470 V450 V420 V 22473 V461 V442 V 20476 V466 V454 V 18477 V473 V465 V Continued page 16 14 Model Aviation conclusion obvious expect get sufficient current through system servos will function designed voltage spikes wont glitch receiver must use least No 20 gauge wire throughout system means need heavy wire starting cells receiver pack heavy duty switch harnesses especially wire going distant servos Dont think high-amp receiver pack will solve prob lem Only sufficiently large wire able conduct current distant locations supply high demand feel havent suffered problems described dont misled model critical low-level attitude requires full servo power time battery wir ing circuit wont able deliver Since Im neither flier big models nor electrical engineer must accept Ralphs warning fact Im passing consideration next time install radio system big model As final topic month return favorite subjectpropellers lengthy letter received Marvin Denny Wichita KS Im reprinting its en tirety Some Marvins suggestions procedures should followed order prevent propeller accidents have stated column previously However dont think can ever say too much about hazard rotating props Over Marvin have two subjects would like bring attention serious safety hazards inherent hobby Although both occurrences happened Control Line activities equally applicable other fields powered model aviation first incident happened recently during break-in test bench glow engine 36 size initial start what thought good propeller blade came off either due bad grain wood because plug leads got prop happened fast dont know whether battery clip came off broke prop blade slung off resulting vibration shook clip off just started engine moving around front hazardous place rear just point line prop arc accident occurred Fortunately wearing safety glasses time blade struck lens left side inflicting deep scratch glass ap proximately 3/s-in long glass did break deflected blade such surrounding skin scratched point careful place yourself front running engine can dangerous place during transition dangerous place safe place So safetys sake always careful wear safety equipmentin case glasses incident started thinking Continued page 123 16 Model Aviation WITH FEATURES YOU THE MODELER WANTED 24 insignia sheets also letters numbers 0 majardecals available popular 40- 6Qsizes plus American Giant Scale size believe majardecals have comprehensive assortment available now -with sizes styles coming time pressure sensitive water transfer Well bet line handing line.the complete line decals available model anywhere ___@0 youll love being handed major decals D s bu o s nqu ries nv ted TEL 413 525 410 cONTAcT YOUR LOCAL HOBBY SHOP OR WRITE DIRECT NORTHEAST SCREEN GRAPHICS 21 FISHER AVE. EAST LONOMEASOW MA 01028 small portion threepage letter Bill wrotemostly concerning experiences CL modeling near close WW II afterwards Its fascinating stuff Weve invited him write feature article about CL modeling era Safety/Preston Continued oaoe 16 results thoughts First front engine start Hold ing battery clip left hand reaching around prop arc exhaust side flipping prop right hand normal Hazard number What happens engine starts slip am caused move right left forearm wrist very close proximity whirling prop should use battery clip does require physical holding stay connected Hazard number two Did check prop tightness Loose props broken crankshafts engines coming out test mount go forward dont stay front running engine Always double check prop tightness use engine test stand strong enough handle size engine runningdouble check securing engine being firmly bolted down Third hazard moving front engine back thrown prop blades broken prop blades items hitting blades thrown out sides often great velocity Make transition front rear quickly possible linger line prop arc check prop blade tracking other Hazard number four Has prop tip painted contrasting visible color turning outer edge prop arc can seen should painted back about bright ye low red white engine running prop arc will visible Hazard number five monitoring running engine behind remember gravel small items can picked up prop blast propelled rearward enough force cause eye damage sure gravel debris small items cleared away engine test stand area before starting engine Hazard number six adjusting needle valve new engine during breakin should careful engine often runs erratically surges making diffi cult get secure hold needle valve front-intake engine surging could cause get fingers prop needle hard turn would safer shut engine down make adjustments Hazard number seven After shut-down engine often very hot Placing hands engine right after shut-down could result painful burns Dont touch engine just after shut-down see hot Hazard number eight common prac tice flip propeller through several times right after engine quits break-in runs get better cool-down warpage cases cylinders careful engine often hot enough restart fire benefit hooking up battery Flip prop respect would give fuel engine battery hooked up above-listed eight hazards jumped up bit tunate have worn safety glasses got attention enough make think hazards involved routine project simple breaking-in new engine am sure other dangerous things did mention two common causes accidents negligence stupidity PS read son also competitor said Dad missed couple told missed cut fingers hand-cranking new engines Theyre often very tight seize bind first couple starts fact along propellers have very sharp trailing edges often leads severely lacer ated fingers should use wood pro pellers during break-in sure both blades have blunted leading trailing edges Blunted edges espe cially necessary using plastic nylon fiberglass-type props other item mentioned physi cally painful just important sonoise Ear damage cumulative insidious sneaks up fore realize permanent damage can incurred should use mufflers ear muffs ear plugs protect ears second accident happened actually occurred several years ago recently reminded seeing other modeler almost having identical ac cident hazard caused byand herent withmulti-engine aircraft scale model B-29 four Enya 19 engines agreed fly exhibition flight Dumas TX Saturday afternoon whats new waited until morning get model ready hadnt flown run recently drove over Dumas about noon leaving little time prepare flying site After getting engine run-in site getting everything else ready sup posedly moved plane circle Now time essence tie up circle excessive amount time Helpers consisted man holding plane fuselage tail man behind wing move booster bat tery engine engine myself front plane starting engines Plenty help right Now plot got sticky engines running smoothly run indi vidually just prior remember both wing men moved fuel boosters other equipment clear plane Now Continued page 126 March 1984 123 holder near plane sud denly No 2 engine inboard engine left wing started sag due trash cold castor something fuel instinc tively reached around No 2 engine pro peller quickly adjust needleright through No 1 propeller screaming full bore Ow Extremely severe lacerations incurred back right hand impact killed No 1 No 2 died anyway wing helpers came over killed No 3 No 4 did later complete exhibition flight though considerable pain wrapped hand myself didnt go doctor until Mondayand after noticed some unusual bone movement placed little pressure fingers right hand Lets look what caused accident First delayed getting plane ready until last day didnt have act together second didnt give myself enough time day demo too much hurry third too much concerned tying up circle too long preoccupied fourth coordinated helpers should what therefore leaving insufficient help up until launch fifth stupidity previous four items re sulted wrong move could have let die got helper back restarted Fifth stupidity again though knew injured quite badly bleeding long deep gashes back hand deep pain armpit slight nausea neglected go doctor have treated also told stupid analysis going some thing used doing regu larly prepare well advance let desire get job done cause hurry point forgetting careful Al ways coordinate helpers will know what sure have enough help last probably important have ac cident injured self-diagnose injuries doubt serious see doctor should constantly aware adja cent engines running hand-starting careful get running engine either starting flip passing through after flip best use electric starter multi-engine air craft Marvin included pictures scratched safety glasses letter However came time write column couldnt find have recently moved new home will no doubt remember takes find everything again Have safe month John Preston Model Aviation 1810 Samuel Morse Dr Reston VA 22090 Fun/Winter Continued page 28 used 11-8 prop though manufac turer Leisure recommends 11-7 LeCrate seven cells 41 oz 134 wing loading should 1006 accord ing formula Thats exact average dont come up formulas prediction something wronglike prop cant go Dons prop work too much relates best propel ler diameter airplane flight speed wing loading LeCrate 12 14 An efficient pitch/diameter figure region 60 70% indicating 7 10-in pitch am using 11-7/2 Rev-Up 21/21 reduction am now flying 12-7 deBolt-modified Y-O seven cells 381 reduction guessing right direction glide find LeCrate two different airplanes depending whether use direct drive reduction drive because dont have folder 21/21 381 larger props really change glide seven cells glide faster Thats wing loading factor work though terms max duration important advantage battery weight prop free* * Long Engine Life * * Use BRU LINE Air Cleaner Completely Fuel Proof Nylon Rubber Parts Cat No 102 Air Cleaner Coarse $225 Cat No 202 Air Cleaner Fine $225 Replacement Inserts Cat No 104 Pk/2 Inserts Coarse $195 Cat No204 Pk/2 Inserts Fine $195 FITS MOST ENGINES 25 UP SEE YOUR LOCAL HOBBY DEALER IF UNAVAILABLE LOCALLY SEND TO Add 75 shippingMichigan residents add 4% sales tax Bru Line Industries Inc PO Box 3786 Center Line Michigan 48015 U orasriU man nru lar inquIres/For. ncr .nisnfls ROOKIE Super beginner di 60 wing span $2799 CITARRIA65 wing span25-40 power$3399 SCALE KITS CHAMPION CITABRIA Owing span 60 pwr & up $6499 BUD NOSEN TRAINER 102 wing span 60 pwr-up $5599 PIPER CUP J3 9 wing span 60 power & up $7588 P51-B 102 wing span quadra power $10899 P-5 1-0 102 wing span quadra power $10899 1933 GERE SPORT 8 wing span 60 power & up $8999 CESSNA 310 TWIN lOwing span twin 60 pwr $12299 MR MULLIGAN 9 wing span 60 power $8499 F4-U CORSAIR 109 wing span quadra powerwrite/caII Other kits & accessories available for price Catalog $200 126 Model Aviation Safety/Preston Continued page 123
Edition: Model Aviation - 1984/03
Page Numbers: 12, 14, 16, 123, 126
WE Satfig wuwsTiESV w Sailplanes can getcha Big RC mod els need heavy-duty RC system wiring youre running model engine youve got con stantly alert No stu pidity allowed John Preston BEFORE getting discussion con tents last months mailbag let point home ad dress used ap pear end Safety column no longer valid Ive movedtemporarilyto apartment until new home completed sometime spring Meanwhile mail Safety Comes First should sent magazine marked attention Lets start months Safety column subject RC Sailplanes Perhaps absence noise generally slower ti ight characteristics engine-powered RC models would lead forgetting being hit Sailplane could result injury Just remember world speed record RC model aircraft established RC Sailplane Anyway back correspondence Two letters phone call during last month subject engineless models First phone call Unfortuntely caller must remain anonymous notes made somewhere cardboard boxa victim recent move memory names isnt what used seems modeler area competed number Sailplane contests during past summer regularly crashed entry areas occupied contestants and/or spectators phone caller wanted some advice what could done prevent happening future example can contestant barred entering contest because lack flying proficiency Good question standards estab lish acceptable level flying pro ficiency after entering contest fly ing first round contestant observed CD guilty infraction good safety practice pro cedure could disqualified stated AMA rule book Section 1 Paragraph 17 However Im aware provision would permit CD exclude contestant contest merely because crashed model previous contests response phone caller regard safety spectators other con testants Sailplane contests point out models flown over people unlikely crash people event modeler loses control Unfortunately models being flown Sailplane contests will frequently pass over spectator pit areas appears practice will result disqualification un sportsmanlike conduct hazardous flying over controlled spectator area takes place rule book doesnt tell us determined contests engine-powered RC models flying over controlled spectator areas defined haz ardous will generally result dis qualification flight during occurs Perhaps should also case contests RC Sailplanes Any com ments Sailplane fliers will wel comed case Sailplane fliers feel Im being unfair suggesting shouldnt fly over people perhaps fol lowing account appeared news letter North County Clouds Sailplane Club may illustrate what can happen severe crash occurred pits plane experienced radio failure dove very high speed straight ground exploding impact wing near root struck Bob Williams forearm resting arm chair has large lump nasty bruise foot different direction might have killed Im alarmist scenario must mentioned Flying over pits anything less launch height cannot condoned Common sense seems have way being forgotten heat com petition especially setting up pre cision landing approach Im sure writer pre ceding tale seems condone flying over pits launch height safer high altitude receiver batteries roll over play dead9 opinion Before leaving subject RC Sailplanes letter Rick McCullum Salem IL warns us another way might struck RC Sail plane last contest incident occurred put scare flight about 530 going six minutes hollered Coming did 15-second circle entered pattern did downwind base turned onto final Continued page 14 12 Model Aviation 7 TUSE RU5&ER EANDS NEEI 10 E PLACEV thereb beholdwere pilot timer landing circle measuring landing couldnt have better bead Joes head Fortunately able give plane some Up get over people still get 45 landing points did ever utter naughty word apologize earshotlike East St Louis Perhaps easiest way offer com ment Ricks story quote para graph rule book deals landing points RC Sailplane event 125 The retrieval model landing area must done extreme caution utmost dispatch measurement required position nose model may marked model removed measurement may performed later safer time Ricks case timer new job gave no warning peo ple landing circle Sailplane pilot does have assistant timer should take duty warning pilot and/or retrievers other models conflict developing Turning Sailplanes subject big models following warning re ceived Ralph Warner Radio Con trolled Models Inc RAM makers number safety devices RC fliers WARNING BIG MODELS REQUIRE BIG WIRES Have some unusual radio glitches maneuvered through various stunts Are suspicious servos very sluggish high loads placed Has model crashed because unable recover high-airload maneuver Radio servo problems can caused limited conducting ability stan dard No 24 No 26 gauge hook-up wire commonly used radio systems Typical high-power servos draw amp start movement Airloads large surfaces especially elevators can easily double amperage demand Simultaneous servo operation places ad ditional load wires circuit Dis tant servos automatically suffer current loss due restriction through conducting wires Current demand under airload can high eight amps tests show voltage available through various gauges quality stranded hook-up wire shown below using standard 48 volt Ni-Cd pack two-amp load servo circuit Voltage Available Wire Wire GaugeLength 1 Ft 3Ft 6Ft 26464 V437 V384 V 24470 V450 V420 V 22473 V461 V442 V 20476 V466 V454 V 18477 V473 V465 V Continued page 16 14 Model Aviation conclusion obvious expect get sufficient current through system servos will function designed voltage spikes wont glitch receiver must use least No 20 gauge wire throughout system means need heavy wire starting cells receiver pack heavy duty switch harnesses especially wire going distant servos Dont think high-amp receiver pack will solve prob lem Only sufficiently large wire able conduct current distant locations supply high demand feel havent suffered problems described dont misled model critical low-level attitude requires full servo power time battery wir ing circuit wont able deliver Since Im neither flier big models nor electrical engineer must accept Ralphs warning fact Im passing consideration next time install radio system big model As final topic month return favorite subjectpropellers lengthy letter received Marvin Denny Wichita KS Im reprinting its en tirety Some Marvins suggestions procedures should followed order prevent propeller accidents have stated column previously However dont think can ever say too much about hazard rotating props Over Marvin have two subjects would like bring attention serious safety hazards inherent hobby Although both occurrences happened Control Line activities equally applicable other fields powered model aviation first incident happened recently during break-in test bench glow engine 36 size initial start what thought good propeller blade came off either due bad grain wood because plug leads got prop happened fast dont know whether battery clip came off broke prop blade slung off resulting vibration shook clip off just started engine moving around front hazardous place rear just point line prop arc accident occurred Fortunately wearing safety glasses time blade struck lens left side inflicting deep scratch glass ap proximately 3/s-in long glass did break deflected blade such surrounding skin scratched point careful place yourself front running engine can dangerous place during transition dangerous place safe place So safetys sake always careful wear safety equipmentin case glasses incident started thinking Continued page 123 16 Model Aviation WITH FEATURES YOU THE MODELER WANTED 24 insignia sheets also letters numbers 0 majardecals available popular 40- 6Qsizes plus American Giant Scale size believe majardecals have comprehensive assortment available now -with sizes styles coming time pressure sensitive water transfer Well bet line handing line.the complete line decals available model anywhere ___@0 youll love being handed major decals D s bu o s nqu ries nv ted TEL 413 525 410 cONTAcT YOUR LOCAL HOBBY SHOP OR WRITE DIRECT NORTHEAST SCREEN GRAPHICS 21 FISHER AVE. EAST LONOMEASOW MA 01028 small portion threepage letter Bill wrotemostly concerning experiences CL modeling near close WW II afterwards Its fascinating stuff Weve invited him write feature article about CL modeling era Safety/Preston Continued oaoe 16 results thoughts First front engine start Hold ing battery clip left hand reaching around prop arc exhaust side flipping prop right hand normal Hazard number What happens engine starts slip am caused move right left forearm wrist very close proximity whirling prop should use battery clip does require physical holding stay connected Hazard number two Did check prop tightness Loose props broken crankshafts engines coming out test mount go forward dont stay front running engine Always double check prop tightness use engine test stand strong enough handle size engine runningdouble check securing engine being firmly bolted down Third hazard moving front engine back thrown prop blades broken prop blades items hitting blades thrown out sides often great velocity Make transition front rear quickly possible linger line prop arc check prop blade tracking other Hazard number four Has prop tip painted contrasting visible color turning outer edge prop arc can seen should painted back about bright ye low red white engine running prop arc will visible Hazard number five monitoring running engine behind remember gravel small items can picked up prop blast propelled rearward enough force cause eye damage sure gravel debris small items cleared away engine test stand area before starting engine Hazard number six adjusting needle valve new engine during breakin should careful engine often runs erratically surges making diffi cult get secure hold needle valve front-intake engine surging could cause get fingers prop needle hard turn would safer shut engine down make adjustments Hazard number seven After shut-down engine often very hot Placing hands engine right after shut-down could result painful burns Dont touch engine just after shut-down see hot Hazard number eight common prac tice flip propeller through several times right after engine quits break-in runs get better cool-down warpage cases cylinders careful engine often hot enough restart fire benefit hooking up battery Flip prop respect would give fuel engine battery hooked up above-listed eight hazards jumped up bit tunate have worn safety glasses got attention enough make think hazards involved routine project simple breaking-in new engine am sure other dangerous things did mention two common causes accidents negligence stupidity PS read son also competitor said Dad missed couple told missed cut fingers hand-cranking new engines Theyre often very tight seize bind first couple starts fact along propellers have very sharp trailing edges often leads severely lacer ated fingers should use wood pro pellers during break-in sure both blades have blunted leading trailing edges Blunted edges espe cially necessary using plastic nylon fiberglass-type props other item mentioned physi cally painful just important sonoise Ear damage cumulative insidious sneaks up fore realize permanent damage can incurred should use mufflers ear muffs ear plugs protect ears second accident happened actually occurred several years ago recently reminded seeing other modeler almost having identical ac cident hazard caused byand herent withmulti-engine aircraft scale model B-29 four Enya 19 engines agreed fly exhibition flight Dumas TX Saturday afternoon whats new waited until morning get model ready hadnt flown run recently drove over Dumas about noon leaving little time prepare flying site After getting engine run-in site getting everything else ready sup posedly moved plane circle Now time essence tie up circle excessive amount time Helpers consisted man holding plane fuselage tail man behind wing move booster bat tery engine engine myself front plane starting engines Plenty help right Now plot got sticky engines running smoothly run indi vidually just prior remember both wing men moved fuel boosters other equipment clear plane Now Continued page 126 March 1984 123 holder near plane sud denly No 2 engine inboard engine left wing started sag due trash cold castor something fuel instinc tively reached around No 2 engine pro peller quickly adjust needleright through No 1 propeller screaming full bore Ow Extremely severe lacerations incurred back right hand impact killed No 1 No 2 died anyway wing helpers came over killed No 3 No 4 did later complete exhibition flight though considerable pain wrapped hand myself didnt go doctor until Mondayand after noticed some unusual bone movement placed little pressure fingers right hand Lets look what caused accident First delayed getting plane ready until last day didnt have act together second didnt give myself enough time day demo too much hurry third too much concerned tying up circle too long preoccupied fourth coordinated helpers should what therefore leaving insufficient help up until launch fifth stupidity previous four items re sulted wrong move could have let die got helper back restarted Fifth stupidity again though knew injured quite badly bleeding long deep gashes back hand deep pain armpit slight nausea neglected go doctor have treated also told stupid analysis going some thing used doing regu larly prepare well advance let desire get job done cause hurry point forgetting careful Al ways coordinate helpers will know what sure have enough help last probably important have ac cident injured self-diagnose injuries doubt serious see doctor should constantly aware adja cent engines running hand-starting careful get running engine either starting flip passing through after flip best use electric starter multi-engine air craft Marvin included pictures scratched safety glasses letter However came time write column couldnt find have recently moved new home will no doubt remember takes find everything again Have safe month John Preston Model Aviation 1810 Samuel Morse Dr Reston VA 22090 Fun/Winter Continued page 28 used 11-8 prop though manufac turer Leisure recommends 11-7 LeCrate seven cells 41 oz 134 wing loading should 1006 accord ing formula Thats exact average dont come up formulas prediction something wronglike prop cant go Dons prop work too much relates best propel ler diameter airplane flight speed wing loading LeCrate 12 14 An efficient pitch/diameter figure region 60 70% indicating 7 10-in pitch am using 11-7/2 Rev-Up 21/21 reduction am now flying 12-7 deBolt-modified Y-O seven cells 381 reduction guessing right direction glide find LeCrate two different airplanes depending whether use direct drive reduction drive because dont have folder 21/21 381 larger props really change glide seven cells glide faster Thats wing loading factor work though terms max duration important advantage battery weight prop free* * Long Engine Life * * Use BRU LINE Air Cleaner Completely Fuel Proof Nylon Rubber Parts Cat No 102 Air Cleaner Coarse $225 Cat No 202 Air Cleaner Fine $225 Replacement Inserts Cat No 104 Pk/2 Inserts Coarse $195 Cat No204 Pk/2 Inserts Fine $195 FITS MOST ENGINES 25 UP SEE YOUR LOCAL HOBBY DEALER IF UNAVAILABLE LOCALLY SEND TO Add 75 shippingMichigan residents add 4% sales tax Bru Line Industries Inc PO Box 3786 Center Line Michigan 48015 U orasriU man nru lar inquIres/For. ncr .nisnfls ROOKIE Super beginner di 60 wing span $2799 CITARRIA65 wing span25-40 power$3399 SCALE KITS CHAMPION CITABRIA Owing span 60 pwr & up $6499 BUD NOSEN TRAINER 102 wing span 60 pwr-up $5599 PIPER CUP J3 9 wing span 60 power & up $7588 P51-B 102 wing span quadra power $10899 P-5 1-0 102 wing span quadra power $10899 1933 GERE SPORT 8 wing span 60 power & up $8999 CESSNA 310 TWIN lOwing span twin 60 pwr $12299 MR MULLIGAN 9 wing span 60 power $8499 F4-U CORSAIR 109 wing span quadra powerwrite/caII Other kits & accessories available for price Catalog $200 126 Model Aviation Safety/Preston Continued page 123
Edition: Model Aviation - 1984/03
Page Numbers: 12, 14, 16, 123, 126
WE Satfig wuwsTiESV w Sailplanes can getcha Big RC mod els need heavy-duty RC system wiring youre running model engine youve got con stantly alert No stu pidity allowed John Preston BEFORE getting discussion con tents last months mailbag let point home ad dress used ap pear end Safety column no longer valid Ive movedtemporarilyto apartment until new home completed sometime spring Meanwhile mail Safety Comes First should sent magazine marked attention Lets start months Safety column subject RC Sailplanes Perhaps absence noise generally slower ti ight characteristics engine-powered RC models would lead forgetting being hit Sailplane could result injury Just remember world speed record RC model aircraft established RC Sailplane Anyway back correspondence Two letters phone call during last month subject engineless models First phone call Unfortuntely caller must remain anonymous notes made somewhere cardboard boxa victim recent move memory names isnt what used seems modeler area competed number Sailplane contests during past summer regularly crashed entry areas occupied contestants and/or spectators phone caller wanted some advice what could done prevent happening future example can contestant barred entering contest because lack flying proficiency Good question standards estab lish acceptable level flying pro ficiency after entering contest fly ing first round contestant observed CD guilty infraction good safety practice pro cedure could disqualified stated AMA rule book Section 1 Paragraph 17 However Im aware provision would permit CD exclude contestant contest merely because crashed model previous contests response phone caller regard safety spectators other con testants Sailplane contests point out models flown over people unlikely crash people event modeler loses control Unfortunately models being flown Sailplane contests will frequently pass over spectator pit areas appears practice will result disqualification un sportsmanlike conduct hazardous flying over controlled spectator area takes place rule book doesnt tell us determined contests engine-powered RC models flying over controlled spectator areas defined haz ardous will generally result dis qualification flight during occurs Perhaps should also case contests RC Sailplanes Any com ments Sailplane fliers will wel comed case Sailplane fliers feel Im being unfair suggesting shouldnt fly over people perhaps fol lowing account appeared news letter North County Clouds Sailplane Club may illustrate what can happen severe crash occurred pits plane experienced radio failure dove very high speed straight ground exploding impact wing near root struck Bob Williams forearm resting arm chair has large lump nasty bruise foot different direction might have killed Im alarmist scenario must mentioned Flying over pits anything less launch height cannot condoned Common sense seems have way being forgotten heat com petition especially setting up pre cision landing approach Im sure writer pre ceding tale seems condone flying over pits launch height safer high altitude receiver batteries roll over play dead9 opinion Before leaving subject RC Sailplanes letter Rick McCullum Salem IL warns us another way might struck RC Sail plane last contest incident occurred put scare flight about 530 going six minutes hollered Coming did 15-second circle entered pattern did downwind base turned onto final Continued page 14 12 Model Aviation 7 TUSE RU5&ER EANDS NEEI 10 E PLACEV thereb beholdwere pilot timer landing circle measuring landing couldnt have better bead Joes head Fortunately able give plane some Up get over people still get 45 landing points did ever utter naughty word apologize earshotlike East St Louis Perhaps easiest way offer com ment Ricks story quote para graph rule book deals landing points RC Sailplane event 125 The retrieval model landing area must done extreme caution utmost dispatch measurement required position nose model may marked model removed measurement may performed later safer time Ricks case timer new job gave no warning peo ple landing circle Sailplane pilot does have assistant timer should take duty warning pilot and/or retrievers other models conflict developing Turning Sailplanes subject big models following warning re ceived Ralph Warner Radio Con trolled Models Inc RAM makers number safety devices RC fliers WARNING BIG MODELS REQUIRE BIG WIRES Have some unusual radio glitches maneuvered through various stunts Are suspicious servos very sluggish high loads placed Has model crashed because unable recover high-airload maneuver Radio servo problems can caused limited conducting ability stan dard No 24 No 26 gauge hook-up wire commonly used radio systems Typical high-power servos draw amp start movement Airloads large surfaces especially elevators can easily double amperage demand Simultaneous servo operation places ad ditional load wires circuit Dis tant servos automatically suffer current loss due restriction through conducting wires Current demand under airload can high eight amps tests show voltage available through various gauges quality stranded hook-up wire shown below using standard 48 volt Ni-Cd pack two-amp load servo circuit Voltage Available Wire Wire GaugeLength 1 Ft 3Ft 6Ft 26464 V437 V384 V 24470 V450 V420 V 22473 V461 V442 V 20476 V466 V454 V 18477 V473 V465 V Continued page 16 14 Model Aviation conclusion obvious expect get sufficient current through system servos will function designed voltage spikes wont glitch receiver must use least No 20 gauge wire throughout system means need heavy wire starting cells receiver pack heavy duty switch harnesses especially wire going distant servos Dont think high-amp receiver pack will solve prob lem Only sufficiently large wire able conduct current distant locations supply high demand feel havent suffered problems described dont misled model critical low-level attitude requires full servo power time battery wir ing circuit wont able deliver Since Im neither flier big models nor electrical engineer must accept Ralphs warning fact Im passing consideration next time install radio system big model As final topic month return favorite subjectpropellers lengthy letter received Marvin Denny Wichita KS Im reprinting its en tirety Some Marvins suggestions procedures should followed order prevent propeller accidents have stated column previously However dont think can ever say too much about hazard rotating props Over Marvin have two subjects would like bring attention serious safety hazards inherent hobby Although both occurrences happened Control Line activities equally applicable other fields powered model aviation first incident happened recently during break-in test bench glow engine 36 size initial start what thought good propeller blade came off either due bad grain wood because plug leads got prop happened fast dont know whether battery clip came off broke prop blade slung off resulting vibration shook clip off just started engine moving around front hazardous place rear just point line prop arc accident occurred Fortunately wearing safety glasses time blade struck lens left side inflicting deep scratch glass ap proximately 3/s-in long glass did break deflected blade such surrounding skin scratched point careful place yourself front running engine can dangerous place during transition dangerous place safe place So safetys sake always careful wear safety equipmentin case glasses incident started thinking Continued page 123 16 Model Aviation WITH FEATURES YOU THE MODELER WANTED 24 insignia sheets also letters numbers 0 majardecals available popular 40- 6Qsizes plus American Giant Scale size believe majardecals have comprehensive assortment available now -with sizes styles coming time pressure sensitive water transfer Well bet line handing line.the complete line decals available model anywhere ___@0 youll love being handed major decals D s bu o s nqu ries nv ted TEL 413 525 410 cONTAcT YOUR LOCAL HOBBY SHOP OR WRITE DIRECT NORTHEAST SCREEN GRAPHICS 21 FISHER AVE. EAST LONOMEASOW MA 01028 small portion threepage letter Bill wrotemostly concerning experiences CL modeling near close WW II afterwards Its fascinating stuff Weve invited him write feature article about CL modeling era Safety/Preston Continued oaoe 16 results thoughts First front engine start Hold ing battery clip left hand reaching around prop arc exhaust side flipping prop right hand normal Hazard number What happens engine starts slip am caused move right left forearm wrist very close proximity whirling prop should use battery clip does require physical holding stay connected Hazard number two Did check prop tightness Loose props broken crankshafts engines coming out test mount go forward dont stay front running engine Always double check prop tightness use engine test stand strong enough handle size engine runningdouble check securing engine being firmly bolted down Third hazard moving front engine back thrown prop blades broken prop blades items hitting blades thrown out sides often great velocity Make transition front rear quickly possible linger line prop arc check prop blade tracking other Hazard number four Has prop tip painted contrasting visible color turning outer edge prop arc can seen should painted back about bright ye low red white engine running prop arc will visible Hazard number five monitoring running engine behind remember gravel small items can picked up prop blast propelled rearward enough force cause eye damage sure gravel debris small items cleared away engine test stand area before starting engine Hazard number six adjusting needle valve new engine during breakin should careful engine often runs erratically surges making diffi cult get secure hold needle valve front-intake engine surging could cause get fingers prop needle hard turn would safer shut engine down make adjustments Hazard number seven After shut-down engine often very hot Placing hands engine right after shut-down could result painful burns Dont touch engine just after shut-down see hot Hazard number eight common prac tice flip propeller through several times right after engine quits break-in runs get better cool-down warpage cases cylinders careful engine often hot enough restart fire benefit hooking up battery Flip prop respect would give fuel engine battery hooked up above-listed eight hazards jumped up bit tunate have worn safety glasses got attention enough make think hazards involved routine project simple breaking-in new engine am sure other dangerous things did mention two common causes accidents negligence stupidity PS read son also competitor said Dad missed couple told missed cut fingers hand-cranking new engines Theyre often very tight seize bind first couple starts fact along propellers have very sharp trailing edges often leads severely lacer ated fingers should use wood pro pellers during break-in sure both blades have blunted leading trailing edges Blunted edges espe cially necessary using plastic nylon fiberglass-type props other item mentioned physi cally painful just important sonoise Ear damage cumulative insidious sneaks up fore realize permanent damage can incurred should use mufflers ear muffs ear plugs protect ears second accident happened actually occurred several years ago recently reminded seeing other modeler almost having identical ac cident hazard caused byand herent withmulti-engine aircraft scale model B-29 four Enya 19 engines agreed fly exhibition flight Dumas TX Saturday afternoon whats new waited until morning get model ready hadnt flown run recently drove over Dumas about noon leaving little time prepare flying site After getting engine run-in site getting everything else ready sup posedly moved plane circle Now time essence tie up circle excessive amount time Helpers consisted man holding plane fuselage tail man behind wing move booster bat tery engine engine myself front plane starting engines Plenty help right Now plot got sticky engines running smoothly run indi vidually just prior remember both wing men moved fuel boosters other equipment clear plane Now Continued page 126 March 1984 123 holder near plane sud denly No 2 engine inboard engine left wing started sag due trash cold castor something fuel instinc tively reached around No 2 engine pro peller quickly adjust needleright through No 1 propeller screaming full bore Ow Extremely severe lacerations incurred back right hand impact killed No 1 No 2 died anyway wing helpers came over killed No 3 No 4 did later complete exhibition flight though considerable pain wrapped hand myself didnt go doctor until Mondayand after noticed some unusual bone movement placed little pressure fingers right hand Lets look what caused accident First delayed getting plane ready until last day didnt have act together second didnt give myself enough time day demo too much hurry third too much concerned tying up circle too long preoccupied fourth coordinated helpers should what therefore leaving insufficient help up until launch fifth stupidity previous four items re sulted wrong move could have let die got helper back restarted Fifth stupidity again though knew injured quite badly bleeding long deep gashes back hand deep pain armpit slight nausea neglected go doctor have treated also told stupid analysis going some thing used doing regu larly prepare well advance let desire get job done cause hurry point forgetting careful Al ways coordinate helpers will know what sure have enough help last probably important have ac cident injured self-diagnose injuries doubt serious see doctor should constantly aware adja cent engines running hand-starting careful get running engine either starting flip passing through after flip best use electric starter multi-engine air craft Marvin included pictures scratched safety glasses letter However came time write column couldnt find have recently moved new home will no doubt remember takes find everything again Have safe month John Preston Model Aviation 1810 Samuel Morse Dr Reston VA 22090 Fun/Winter Continued page 28 used 11-8 prop though manufac turer Leisure recommends 11-7 LeCrate seven cells 41 oz 134 wing loading should 1006 accord ing formula Thats exact average dont come up formulas prediction something wronglike prop cant go Dons prop work too much relates best propel ler diameter airplane flight speed wing loading LeCrate 12 14 An efficient pitch/diameter figure region 60 70% indicating 7 10-in pitch am using 11-7/2 Rev-Up 21/21 reduction am now flying 12-7 deBolt-modified Y-O seven cells 381 reduction guessing right direction glide find LeCrate two different airplanes depending whether use direct drive reduction drive because dont have folder 21/21 381 larger props really change glide seven cells glide faster Thats wing loading factor work though terms max duration important advantage battery weight prop free* * Long Engine Life * * Use BRU LINE Air Cleaner Completely Fuel Proof Nylon Rubber Parts Cat No 102 Air Cleaner Coarse $225 Cat No 202 Air Cleaner Fine $225 Replacement Inserts Cat No 104 Pk/2 Inserts Coarse $195 Cat No204 Pk/2 Inserts Fine $195 FITS MOST ENGINES 25 UP SEE YOUR LOCAL HOBBY DEALER IF UNAVAILABLE LOCALLY SEND TO Add 75 shippingMichigan residents add 4% sales tax Bru Line Industries Inc PO Box 3786 Center Line Michigan 48015 U orasriU man nru lar inquIres/For. ncr .nisnfls ROOKIE Super beginner di 60 wing span $2799 CITARRIA65 wing span25-40 power$3399 SCALE KITS CHAMPION CITABRIA Owing span 60 pwr & up $6499 BUD NOSEN TRAINER 102 wing span 60 pwr-up $5599 PIPER CUP J3 9 wing span 60 power & up $7588 P51-B 102 wing span quadra power $10899 P-5 1-0 102 wing span quadra power $10899 1933 GERE SPORT 8 wing span 60 power & up $8999 CESSNA 310 TWIN lOwing span twin 60 pwr $12299 MR MULLIGAN 9 wing span 60 power $8499 F4-U CORSAIR 109 wing span quadra powerwrite/caII Other kits & accessories available for price Catalog $200 126 Model Aviation Safety/Preston Continued page 123