NOTE title months column ends question mark Whether agree disagree question may well depend whether currently flying building biggie magazine column just finished reading Last fall happened pick up two magazines local hobby emporium found both editorials concerning safety big models interesting read two totally differing viewpoints safety question taken two editors believed doing enough limit size models accused AMA being too timid step establish reasonable absolute model aircraft limits other editor also took poke AMA time because felt faction short-sighted people established limits too stringent seems limit established going come under attack both sides Im going add fuel fire stating opinions maximum model size However believe well worth time discuss some safety topics mostly confined new breed big models appears called controversy safety big models has centered effects collision person Apparently believe result collision between -scaler human being would significantly worse collision involving conventional sized modeL personally dont think serves purpose discuss issue since l has sufficient energy cause death strikes vulnerable body part know case Europe 19-powered trainer caused death 6year-old boy some reason loss control occurred Losing control RC model probably principal cause injury due collision may happen because pilot error radio malfunction mechanical failure doubt chance pilot error radio failure increased increase model size know couple cases mechanical failure large size model appeared contributing factor both cases aileron control lost because aerody namic flutter would first admit control surface flutter can occur small model However think big models much less forgiving poor workmanship results sloppy control surfaces witnessed separa tion ailerons large scale model owner installed Quadra because propdrive 60 recommended kit manufacturer insufficient power satisfy needs vertical maneuvers addition mass balances ailerons solved problem other case threaded brass rod aileron control linkage broke because flutter case hardware used control linkages barn door ailerons just wasnt man enough job result extremely sloppy control surfaces record neither ofthese incidents resulted crash both models successfully landed using rudder lateral control risk being criticized readers would venture say realm mechanical failure have found evidence big models could less safe small ones modelers penchant having biggest model block would pay some extra attention structural strength particularly control linkages see no reason safety record model aircraft should compromised giants understandable appearance market items cater new trend takes time has area accessories SAFE TV COMES FIRST Bigger modelsbigger safety problems Only case mechanical failure has author found big modelsthe socalled Quarter Scalescould less safe small ones big models frequent use spark-ignition engines has produced another concern gasoline-based fuels Suggested several precautions especially about transporting fuel cars John Preston specifically aimed big model market However have noted recent issues hobby magazines several advertisements hardware big models believe extra pennies costs such hardware well worth security brings terms total investment time money model extra cost negligible such advertisement recently noted necessary items operate control surfaces via cables instead usual pushrods Unless pushrods can kept very short rigid would suggest builders big models consider cables both sides servo output arm horns either side control surface common full-scale aircraft Orville Wilbur used cables scale competition thing such practice may pay off netting extra static points well mechanically sounder control system Another example new products big models heavy-duty servo question arises what point have switch say KPS-15 high-torque servos dont have immediate answer Perhaps somebody out well versed aerodynamics could come up some graphs tables illustrating control forces necessary deflect various sized surfaces typical airspeeds course aerodynam ics taken some 20 years ago have forgotten everything learned wasnt much anyway appears models have observed KPS-15s equiva lent servos can handle control forces chainsaw powered models around 25 pounds no apparent difficulty Editors Note have head head problem servo two normal ones wing panelwing being twopanel Problems other safety made two preferable business big planes being unflyable occasionally due multitude wires fittings cables FM being considered ideal solution time well frequent problems long leads servos adjacent ailerons located wing roots mechanical linkages out ailerons Just reminder several problem areas recently mentioned print safety related As see going safety problem associated operation big models likely will have nothing size What does concern us fuel necessary make converted chainsaw powerplant mngasoline Somebody club recently joked increased use gasoline fuel might spark pun intended some spectacular crashes smoke flames just like real ones no joking matter although date have heard gas-fueled model igniting after crash being consumed resulting fire think explosion fire much likely result during transportation model field can gas perhaps trunk car during fueling model starting process Perhaps should elaborate concerns So called gas cans may purchased rela tively cheaply local supermarket drug store Such cans appear very similar used package glow engine fueL have very often seen cans glow fuel sale local hobby store soggy fuel stained labels due seepage fuel through poorly sealed cap faulty seam same can happen cheap cans sold storage ofgasoline however big difference hazard gasoline vapors emitted glow fueL has said gallon gasoline stored trunk automobile has explosive power 14 sticks dynamite trunk car parked sun can get pretty hot causing dramatic increase pressure can gasoline may stored smallest leak could end up trunk full gasoline vapor desirable situation As alternative cheap drug store variety gas can could use called safety can sold better quality auto parts stores industrial supply stores cans UL listed indicating comply certain requirements requirements shall have cap will release pressure may build up can exceeds 5 psi Again have storage vessel doesnt sound too healthy have ones automobile trunk contains gasoline must carry gasoline inside Continued page 118 March 1980 57 EAA members receive SPORT VIA TION magazine EXPERIMENTAL AIRCRAFT ASSOCIATION INC PO Box 229 Hales Corners Wisconsin 53130 EXPERIMENTAL A SSOCIATION issue Homebuilders Corner ers Editor Line Headquarters involvement 80 osh 79 Energy Ultralights osh Awards 79 Chapters Action tplane Builder on Accent nes Oshkosh a Over Oshkosh Jim Theis Nighthawk Pegasus. Grand Champion Thoroughbred Glanville Skymaster osh 79 Custombuilts rve Grand Champion Humbug osh 79 500 Bowers Baker-Faick Competition etitor Flying L-B-F 500 Members Are Building ng Flea ndar Events Washington Report SpecialSPORT AIRCRAFT YOU CAN BUILD$495 pp CLEVELAND GIANTS ds Largest Gas Plans Assortment 86 C-D GIANTS OVER S MOST EVERY IMAGIN TO 10 NOW AVAILABLE ABLE TYPE PLANE AND 140 Others n Ga 5,IN MANY SCALES9t. 6#/ooo C6 Cob, 526 69L,dkeg NT-211 $24 .. 64 teed C17E SMg $36 91 Li,dbege N0-211 $36 W 96 Beech C17-B Soo$49 61 AEG OIV LI Bo, $24 82 Lock II Elec,$32 10$ P0 ci P019 T$49 t4 SEc,, T/W SE-7 $24 68 Joolce oJU88 to, $24 126 Sjoon T/W $87 $22 66 PIo,oo B ood W29 $20 59 EciDol Plc P2E$20 90 Woco Tope W 08 $22 78 Orcolol Plc P2-B$29 76 Bycd Po4 Tcinc $26. 64 Reococj SpoedI $24 114 Bycd P04 TcIol $48 74 TL Peco Spec $29 78 Ococc J2P Sock $48 62 Skycookel XP5P-1 $20 80 Siec0,oSoE DIV $22 6$ Roo,ko Norricoce $24 117 Golko DiV 80, $39 74 Rep SeoBee An $26 10$ SikocS2tAcopIc $39 80 Gcoo OBE Ace,g $32 80 MorOn 74 T4M-1 $36 * 106 Pipec J2 Cob $49 7$ 9-Pogo 0400 Eocc $28 98 Lock Hodoon B,, $26 18804on 4 62Gro, P6P HelIcal $28 71 L 77000ng t17GPoI$29 640 7 103 Boo 0170 P01 $49 688 68 WeelI WhiInniod $24 72 C 68 Beecho Bo,oeoo $26 OR 2 YRS 8 00 ADO 68 Ryoc Nov10,$26 PICT MANT MORE TO COME15, P BY CE OR MO 1208 PINE PLANS MASOLO MODELS PLANS THEY START AT 49c * LISTS AS E 09 25 Add 18% 10611 Ode Eon 5hppng o,d cc perhaps rudder spring Al glider flopper mechanism might serve basis timer-starter trigger like big-time FAI power fliers use since escapement projects beyond edge case wouldnt ditTicult invent own Other applications Wakefield auto-stab-rudder delayed prop release Wake Coupe P-30 props retractextend mechanism scale model landing gear zoom-launch aileron other control A2 towline gliders currently out fashion due comebaclc innumerable etceteras choice Bob Meuser 4200 Gregory SL Oaklan4 CA 94619 FF Old Timers/Haught continued page 54 Plug plug Theres good news have having difficulty obtaining good spark plugs Replica Engines 14600 Ram stad Drive San Jose CA 95127 offering Japanese NGK brand ME8 plug $500 plus postage ME8 32-thread plug thread reach Champion V-3 makes usable smaller engines requiring shorter plug will functionjust fine replacement Champion V-2 example have well made performs OK electrodes heavy duty like Remco older racing plugs Spark plugs normally have long life often damaged crackups simply lose seal due age little maintenance form good cleaning household ammonia will improve service life Clarence Haught Rt 5 Box 16 CoeurdAlen ID 83814 FF Sport/Scale/Warner continued page 55 aluminum tubes make repair easier storage simpler addition movable control surfaces though bit time-consuming building will make life ever much easier get flying stage double line 1/16 sheet light along aileron rudder elevator separation lines ribs cut fit either side will prove easier install might think can added cutting out part ribs crosses after structure built Use 1/32 scrap keep little space between parts clearance Take em out later hinges use thin beer-can aluminum atleast wide Thin weak wire narrow aluminum strips easily knocked out adjustment will trouble help Shopping balsa can help keep strength belongs getting too heavy Pick out sturdy medium balsa main front-toback fuselage members longerons take load wound motor Leading trailing edges too should too weak Medium weight will Spars wing should medium-hard balsa stringy type does snap cleanly broken model have selected has no spar flush top ribs try couple 1/16 sq strips up keep wing warping upward tissue shrunk Some feel give lift through turbulation effect too Light balsa can used fuselage struts uprights save weight except area wing attachment front end strength important tail medium main spar horizontal stabilizer vertical tail medium balsa rest lightest balsa can lay hands should Making two parts Vt thick better sanding airfoil section can done getting too heavy good idea especially stab less 20% wing area Some designers automatically enlarge area tail pieces over-scale about 10-15% 116 Model Aviation FREE BROCHURE PACK $150 AL DUES $2500 EAA CUSTOM TUNED ENGINES COMPETITION CCESSORIES Special GV 014 X 60 solid lines $295 ppd custom needle valves racing wheels quick fills fuel shut-o Ifs rs detailed brochure send 25 cents Kustom Kraftsmanship Box 2699 Laguna Hills calIf 92653 Ph f714 830-5162
Edition: Model Aviation - 1980/03
Page Numbers: 57, 116
NOTE title months column ends question mark Whether agree disagree question may well depend whether currently flying building biggie magazine column just finished reading Last fall happened pick up two magazines local hobby emporium found both editorials concerning safety big models interesting read two totally differing viewpoints safety question taken two editors believed doing enough limit size models accused AMA being too timid step establish reasonable absolute model aircraft limits other editor also took poke AMA time because felt faction short-sighted people established limits too stringent seems limit established going come under attack both sides Im going add fuel fire stating opinions maximum model size However believe well worth time discuss some safety topics mostly confined new breed big models appears called controversy safety big models has centered effects collision person Apparently believe result collision between -scaler human being would significantly worse collision involving conventional sized modeL personally dont think serves purpose discuss issue since l has sufficient energy cause death strikes vulnerable body part know case Europe 19-powered trainer caused death 6year-old boy some reason loss control occurred Losing control RC model probably principal cause injury due collision may happen because pilot error radio malfunction mechanical failure doubt chance pilot error radio failure increased increase model size know couple cases mechanical failure large size model appeared contributing factor both cases aileron control lost because aerody namic flutter would first admit control surface flutter can occur small model However think big models much less forgiving poor workmanship results sloppy control surfaces witnessed separa tion ailerons large scale model owner installed Quadra because propdrive 60 recommended kit manufacturer insufficient power satisfy needs vertical maneuvers addition mass balances ailerons solved problem other case threaded brass rod aileron control linkage broke because flutter case hardware used control linkages barn door ailerons just wasnt man enough job result extremely sloppy control surfaces record neither ofthese incidents resulted crash both models successfully landed using rudder lateral control risk being criticized readers would venture say realm mechanical failure have found evidence big models could less safe small ones modelers penchant having biggest model block would pay some extra attention structural strength particularly control linkages see no reason safety record model aircraft should compromised giants understandable appearance market items cater new trend takes time has area accessories SAFE TV COMES FIRST Bigger modelsbigger safety problems Only case mechanical failure has author found big modelsthe socalled Quarter Scalescould less safe small ones big models frequent use spark-ignition engines has produced another concern gasoline-based fuels Suggested several precautions especially about transporting fuel cars John Preston specifically aimed big model market However have noted recent issues hobby magazines several advertisements hardware big models believe extra pennies costs such hardware well worth security brings terms total investment time money model extra cost negligible such advertisement recently noted necessary items operate control surfaces via cables instead usual pushrods Unless pushrods can kept very short rigid would suggest builders big models consider cables both sides servo output arm horns either side control surface common full-scale aircraft Orville Wilbur used cables scale competition thing such practice may pay off netting extra static points well mechanically sounder control system Another example new products big models heavy-duty servo question arises what point have switch say KPS-15 high-torque servos dont have immediate answer Perhaps somebody out well versed aerodynamics could come up some graphs tables illustrating control forces necessary deflect various sized surfaces typical airspeeds course aerodynam ics taken some 20 years ago have forgotten everything learned wasnt much anyway appears models have observed KPS-15s equiva lent servos can handle control forces chainsaw powered models around 25 pounds no apparent difficulty Editors Note have head head problem servo two normal ones wing panelwing being twopanel Problems other safety made two preferable business big planes being unflyable occasionally due multitude wires fittings cables FM being considered ideal solution time well frequent problems long leads servos adjacent ailerons located wing roots mechanical linkages out ailerons Just reminder several problem areas recently mentioned print safety related As see going safety problem associated operation big models likely will have nothing size What does concern us fuel necessary make converted chainsaw powerplant mngasoline Somebody club recently joked increased use gasoline fuel might spark pun intended some spectacular crashes smoke flames just like real ones no joking matter although date have heard gas-fueled model igniting after crash being consumed resulting fire think explosion fire much likely result during transportation model field can gas perhaps trunk car during fueling model starting process Perhaps should elaborate concerns So called gas cans may purchased rela tively cheaply local supermarket drug store Such cans appear very similar used package glow engine fueL have very often seen cans glow fuel sale local hobby store soggy fuel stained labels due seepage fuel through poorly sealed cap faulty seam same can happen cheap cans sold storage ofgasoline however big difference hazard gasoline vapors emitted glow fueL has said gallon gasoline stored trunk automobile has explosive power 14 sticks dynamite trunk car parked sun can get pretty hot causing dramatic increase pressure can gasoline may stored smallest leak could end up trunk full gasoline vapor desirable situation As alternative cheap drug store variety gas can could use called safety can sold better quality auto parts stores industrial supply stores cans UL listed indicating comply certain requirements requirements shall have cap will release pressure may build up can exceeds 5 psi Again have storage vessel doesnt sound too healthy have ones automobile trunk contains gasoline must carry gasoline inside Continued page 118 March 1980 57 EAA members receive SPORT VIA TION magazine EXPERIMENTAL AIRCRAFT ASSOCIATION INC PO Box 229 Hales Corners Wisconsin 53130 EXPERIMENTAL A SSOCIATION issue Homebuilders Corner ers Editor Line Headquarters involvement 80 osh 79 Energy Ultralights osh Awards 79 Chapters Action tplane Builder on Accent nes Oshkosh a Over Oshkosh Jim Theis Nighthawk Pegasus. Grand Champion Thoroughbred Glanville Skymaster osh 79 Custombuilts rve Grand Champion Humbug osh 79 500 Bowers Baker-Faick Competition etitor Flying L-B-F 500 Members Are Building ng Flea ndar Events Washington Report SpecialSPORT AIRCRAFT YOU CAN BUILD$495 pp CLEVELAND GIANTS ds Largest Gas Plans Assortment 86 C-D GIANTS OVER S MOST EVERY IMAGIN TO 10 NOW AVAILABLE ABLE TYPE PLANE AND 140 Others n Ga 5,IN MANY SCALES9t. 6#/ooo C6 Cob, 526 69L,dkeg NT-211 $24 .. 64 teed C17E SMg $36 91 Li,dbege N0-211 $36 W 96 Beech C17-B Soo$49 61 AEG OIV LI Bo, $24 82 Lock II Elec,$32 10$ P0 ci P019 T$49 t4 SEc,, T/W SE-7 $24 68 Joolce oJU88 to, $24 126 Sjoon T/W $87 $22 66 PIo,oo B ood W29 $20 59 EciDol Plc P2E$20 90 Woco Tope W 08 $22 78 Orcolol Plc P2-B$29 76 Bycd Po4 Tcinc $26. 64 Reococj SpoedI $24 114 Bycd P04 TcIol $48 74 TL Peco Spec $29 78 Ococc J2P Sock $48 62 Skycookel XP5P-1 $20 80 Siec0,oSoE DIV $22 6$ Roo,ko Norricoce $24 117 Golko DiV 80, $39 74 Rep SeoBee An $26 10$ SikocS2tAcopIc $39 80 Gcoo OBE Ace,g $32 80 MorOn 74 T4M-1 $36 * 106 Pipec J2 Cob $49 7$ 9-Pogo 0400 Eocc $28 98 Lock Hodoon B,, $26 18804on 4 62Gro, P6P HelIcal $28 71 L 77000ng t17GPoI$29 640 7 103 Boo 0170 P01 $49 688 68 WeelI WhiInniod $24 72 C 68 Beecho Bo,oeoo $26 OR 2 YRS 8 00 ADO 68 Ryoc Nov10,$26 PICT MANT MORE TO COME15, P BY CE OR MO 1208 PINE PLANS MASOLO MODELS PLANS THEY START AT 49c * LISTS AS E 09 25 Add 18% 10611 Ode Eon 5hppng o,d cc perhaps rudder spring Al glider flopper mechanism might serve basis timer-starter trigger like big-time FAI power fliers use since escapement projects beyond edge case wouldnt ditTicult invent own Other applications Wakefield auto-stab-rudder delayed prop release Wake Coupe P-30 props retractextend mechanism scale model landing gear zoom-launch aileron other control A2 towline gliders currently out fashion due comebaclc innumerable etceteras choice Bob Meuser 4200 Gregory SL Oaklan4 CA 94619 FF Old Timers/Haught continued page 54 Plug plug Theres good news have having difficulty obtaining good spark plugs Replica Engines 14600 Ram stad Drive San Jose CA 95127 offering Japanese NGK brand ME8 plug $500 plus postage ME8 32-thread plug thread reach Champion V-3 makes usable smaller engines requiring shorter plug will functionjust fine replacement Champion V-2 example have well made performs OK electrodes heavy duty like Remco older racing plugs Spark plugs normally have long life often damaged crackups simply lose seal due age little maintenance form good cleaning household ammonia will improve service life Clarence Haught Rt 5 Box 16 CoeurdAlen ID 83814 FF Sport/Scale/Warner continued page 55 aluminum tubes make repair easier storage simpler addition movable control surfaces though bit time-consuming building will make life ever much easier get flying stage double line 1/16 sheet light along aileron rudder elevator separation lines ribs cut fit either side will prove easier install might think can added cutting out part ribs crosses after structure built Use 1/32 scrap keep little space between parts clearance Take em out later hinges use thin beer-can aluminum atleast wide Thin weak wire narrow aluminum strips easily knocked out adjustment will trouble help Shopping balsa can help keep strength belongs getting too heavy Pick out sturdy medium balsa main front-toback fuselage members longerons take load wound motor Leading trailing edges too should too weak Medium weight will Spars wing should medium-hard balsa stringy type does snap cleanly broken model have selected has no spar flush top ribs try couple 1/16 sq strips up keep wing warping upward tissue shrunk Some feel give lift through turbulation effect too Light balsa can used fuselage struts uprights save weight except area wing attachment front end strength important tail medium main spar horizontal stabilizer vertical tail medium balsa rest lightest balsa can lay hands should Making two parts Vt thick better sanding airfoil section can done getting too heavy good idea especially stab less 20% wing area Some designers automatically enlarge area tail pieces over-scale about 10-15% 116 Model Aviation FREE BROCHURE PACK $150 AL DUES $2500 EAA CUSTOM TUNED ENGINES COMPETITION CCESSORIES Special GV 014 X 60 solid lines $295 ppd custom needle valves racing wheels quick fills fuel shut-o Ifs rs detailed brochure send 25 cents Kustom Kraftsmanship Box 2699 Laguna Hills calIf 92653 Ph f714 830-5162