Letters Editor Send 18 November issues article concerning ~Junk Box Air Compressors piqued interest involved both avocation profession Im devoted RC modeler weekend during week am senior development engineer largest compressor manufacturer world Ingersoll-Rand Co have spent last 18 years developing compressors related equipment mostly 50-500 horse power diesel portables applaud authors spirit ingenuity feel compelled discourage fellow readers building such device As presented details design ignore some very important safety requirements compressed air systems required law commercially produced systems prudent design demands inclusion home-built unit First foremost safety relief valve absolute must compressor compressed air system cannot either/or choice presented pressure switch used cycle compressor between set pressures can fail causing pressure rise until something explodes author article discussed fact explosion could occur compressor allowed run unchecked did insist use relief valve pressure switch present pressure switch good working order explosion could occur during first use trying adjust switch settings Also relief valve must sized properly ASME code states valve must able flow full output compressor 110% valve set pressure Temperature compensation required sizing valve also have experienced relief valve failure cases valve oversized 50% due chattering valve seat because insufficient flow As can see just choosing correct valve involves some expertise people attempting project would have no reason possess second major hazard involves use Freon tank receiver vessel Freon propane tanks designed intended code-rated used air system major problem water collects tanks causes corrosion Continued page 167 JETS ON DISPLAY ORLANDO FL BVM /WINTER PRINGS ORLANQI4rJARORT March 1993 5 DUST DEVIL Slow Speed Aerobatics Trainer Uk Stability Super Short Take Off & Landing 76 Length 60 eq $13995 CHINOOK Primary TrainerFun Fly Sport Plane iMAA LegalAerobatic Trainer pen 81 Area 1110 sq $11995 Both have JT88 Airfoil WHIRLWIND AIRCRAFT 3065 Windjammer Dr Colorado Springs CO 80920 719 2607622 7 da week VISA/MO Junk Box Air Compressor Critique F-86 F-16 Maverick Viper Aggressor necessary accessories call appointment Aria/Winter Hunton Continued page 13 Aria gets job done eight cells dual packs use Hobby Lobby dual charger charges two packs simultane ously has dual ammeters variety rates available After selecting plain BB motor variety battery packs useful various occasions cells windy hot day example Perspective short-wing Aria compatible power models typical mixed-use flying field version excellent transitioning power electric will penetrate handle strong wind no problem flew short wing club field Sunday no else would fly because wind will also react thermals excellent flight characteristics help greatly adjusting electric much flight regime out high far away flier After have made transition power electric looking expand experience capability soaring long wing will provide better response weak lift give extended flights sometimes seeming last long wish Because BEC becomes time-limiting factor need least 250-mAb battery pack receiver exploit Arias full potential Build both wings have optimum occasions moods interchangeable wings battery packs Either Aria can flown out back pea patch will give plenty solid environmentally compatible enjoyment ers Editor Continued page 5 dryer used tanks have no provision draining water receiver should drained daily prevent rust people have killed severely injured over years air tanks have exploded because fracture propagating severe rust pit tank wall must know pressure rating intended tank ensure safety valve set below pressure Most tanks Freon propane variety marked concerning pressure systems commercially available US have tanks constructed under auspices ASME rated code-stamped licensees organization must build own compressor should obtain ASME-coded tank petcock drain Probably easiest way to get portable air tank such would take service station get air Sears various auto parts stores sell quite hazardous valve tank issues encourage user use proper pipe fittings pressures involved Check pressure rating fitting pipe hose intend use Soldered joints should used An adequate belt guard must also Compressed air wonderful versatile power source can deadly hands uninformed user have unpleasant task sorting through gruesome accident scene photos once during career result carelessness usually friendly medium Compressed air can kill heartbeat believe summarize believe members need compressors would much safer satisfied purchase properly engineered manufactured commercially produced compressor realize can expensive new alternatively can readily find used units sale swapand trade-type papers such units have enough life left serve modeler homeowner well years want new will have go competitors company stopped making small homeowner-type units couple years ago dont want sell unit ax have grind help ensure members experience compressors safe productive Randy Little Mocksville North Carolina Input Junk Box Air Compressors am forced write regard article Junk Box Air Compressor Joel Hamm published November 1992 issue ModelAviation page 188 article certainly slipped past safety committee horrified see such information examples displayed promoted safety-conscious publication such MA Please please please Print retraction and/or safety warning readers highest concern use discarded Freon can absolutely illegal federal law reuse cans purpose involving internal pressure liquid refrigerant can design does incorporate safety blow-out patch case can becomes involved extreme pressures such fire problem device actually can heavy certified read expensive pressure vessel sidewalls very thin stamped steel Air compression creates moisture condensation admitted article need dryers system moisture collects can Certified compression tanks have valve drain collected moisture Freon can does collected moisture will corrode very thin walls seams Freon can Thus some point time failure will result Most likely slow leak rusty Continued page 182 P40 WARHAWK Made USA SPECIFICATIONS WING 5PAN 60 ENGINE SIZE60 2-EIROKE WEIGHT78 LBS 111170 PRICE$16000 ALL KITS FEATURE 11AM LAID FIBERGLASS FUSEL4GEPANEL UNES B SCALE DETAILSFOAM CORE WINGS MACHINE CITE FORMERS & BUIKIIEADS SEE YOUR LOCAL DEALER OR G4IL HOBBY HANGAR 606-283-5746 FOR IMMEDU7E DEUVFJtY DEALER INQUIRIFS WELCOME WEACCEPT VISA MASZERCARD & DISCOVER CARDS WE GL4DLYSHIP C OD SHIPPING & HANDLJNG $500 PER KIT COmINEIeTAL USA OTIIER AREAS CALL KEA7UCKYRFSIDEN7S ADD 6% SALES TAX HOBBY HANGAR ISA FULL SER VICE HOBBY SHOP WiTH OVER 11000 ITEMS IN STOCK CATALOGS AVAILABLE $400 EACH WIREBATE ON FIRST ORDER SPECIBY PLANEHEUCOTER OR CAR HANGAR EXCiLICS/VE 057W1E/TOR FIBER SCALE MODELS UELLOYDAVE RW0t KY 41042 606-283-5746 PV*W 606-283-5889 FAX March 1993 167 FOCKE WULF 190 Made USA SPECIFICATIONS WiNG SPAN 65 ENGINE SIZE60510 2-EIROKE VJ-I20 4-STEOKE WEIGHT9-10 LBS IN1RO PRICE$18500 r-4i iIiUNLIEK SPECIFICATIONS WINGSPAN 60 ENGINE SIZE60 2-SEROKE WEIGHTB-AS LBS IA UESMVA 150Made USA SPECIFICATIONS WINGSPAN 65 ENGINE SIZE45-60 2-STEOKE WEIGHT7-75 LBS FULL-SIZE PLANS 732 Long-Wing ARIA$475 Wing plan ARIA #719 Sept 92 MA designed Bill Winter 99-in span 63-oz Variable flap system Compared short wing Aria has increased LID lower sink rate flatter turns Aggressive soarer Forgiving nice fly trainer 10-6 11-6 folding prop Four channels 1 plan sheet No 193 StIletto CL Stool model McDonald nnnner 1976 1580 1962 FAI World Chanrpn$ 375 No262 Croshnoster CL crash-prool rome Tcoosjzos1S/SSand 35/4Spoooer$ 125 No3101930 Fleel Blylsee PC Spon Scale 35/40 posset nod 4-channel Sponn 56 1/5 scale 2 plan sheets$ 025 No 314 Oroke II PC Ken Willard s hying boat ton 3-channel 15 ponoer Fly fonn lend osith removable sean$ 375 No 326 Taylor Cob RC Don Srull s Schoolyani Scala 10045 ponhen 2-3 channel Spann 50 in$ 350 No 332 Zephyr RC semall 2-channel Glider tam hand-loonch taco thernnal am siope nooring$ 200 No 306 Loser 200 PC Sport Scale replica channpionshiy Aerobatic lion FordS posse 45 channol an sheets0 1075 No 447 112A Miss Anrerleos PC Old Tcner 1/28 Tenaca model 1am 045 51050 2channols0 650 No 539 Siedt0r Slow-Motion 10 PC Taillesstlying ooing ton 15 passer Spans 60 3 channel0 350 No578 Oehwoloor 1266 PC Goader-scale Sailplane Spans 125 2 plan Sheets5 1475 No301 Gee Bee Model Y PC Golden Age Racer Spans 72-in 15 scale tar 60 passes 3 plan sheets$ 1175 No 009 Mortob PC Slepe-Soaring Salplane Spans 41 in. 2 PC channels0 425 Ne 096 Coronet 100 PCAasst Sid-Tinne enlarged 150% Spans 72 FOr 40- 4-strakeI30- 2-etlake0 650 No603 Sparrow Idasek P30 FE Coerpetition robber-pacoen plane voon 1907 NaIn Spans 3D in0 225 No 646 WIntee Howk FE Robber-passer Cooped Hicet contpntitioo plane Spans 47 in$ 375 No606 4760 BC Opeelol PC Aenobatic sped plane 10140 pooser Spans Olin 3 pIne sheets$ 1075 No 604 Torsenot RCTrainer/Spadsterstyledaherthe F14 Spano6o Far 40/61 passer 4 plan sheet5 1525 No 661 Etttbry-Onotie FE Enrbrya End orance robber passer plane Spans 205 in$ 200 No667 AT4 CL Senriscale profile Stonten tar 35140 passer Spans 47 in$ 575 No670 BDF1 FEhain-lailed spoatlier tar Coo 02 Pee Wee engine Spans 25 ing 225 No676 Filliner PC nainelentrin Orgo-coing Sport ship designed tar Shine Imp 30 nnotar Hen tricycle gear spans 40 ing 400 No O77TItoedorhItd CL StonIer tar 20-35 pooerTcoa plan sheetS dracon trap original 1982 Veca kit Spans 545g 6BeseBeo FFpoestCoastgostonanGotdoardesignSpanslOin8 150 No 676619 BIngol Large PC Spoosler spanogS 120-24 passer 2 plan sheets5 1700 No601 1969 Bade 604 FE Robber Scale model spans 105 in$ 325 Ne 684 Otaggerwlng Beneb 3-Channel PC Schaalyard-Soale Si-coins Sportster Far 049 passer Spann0 375 No606 Feller PC Panern-type spaS plane Far 2-ar 4-cycie passer Spans 65 in0 725 No606 Stealth Glider FE robberband-loonohed faandbalca Canard Catepolcotealth Glider cecoba Span0 200 No 66pmoenas Morse Ossoot SdC PC 15 scale biplane 50 oncoer Spans 63 3 plan sheets5 1575 Ne6923 Metorgeooter PC high pedonnannooailplane Spans 110 in2 plan sheets5 1150 No 696 Pole Cot FE P30 Class AMA Senior record holder Spans 31 in0 225 60697 Tlgerklttee 6 PC high performance 5pad Aenobatia design FOr 05115 Cobalt eleciric passer Spans 54 n$ 1000 No660TepCot60L-1 FE PobberFAl lndaorStiokGliderSoIdOAMA Cat FlOand Stick National Records Spans 13125 2 plan sheets$ 300 60760 Raedps 0150 PC economical cematile Span Trainer Ideal tar 10 passer Weighs 33-na Spans 50 in5 575 No701 Jompie Gee SC high performance Spanstar designed tartan fly ecents Weighs 3-lb spans 40 40-45 posse9 725 No702 Hainkel eE 16 FE Scale model 011524 German nranoplann Far CiLine Mini-6 geassd 01oct60 motor Spaes2a e$ 200 No703 Cleedhoppor PC Grant Scale 5padstor reminiscent iSSOs heath hosseborit Spans Shin Far 50 passer 2 plan sheets$ 1450 Ne 760 ZeeSh FEHand-Leonch Gliderfomserioos competition Wing OT Spans 18 35-3e grams5 200 No760 4-Geen PC lass coing 411-50-pacoered Sport Aerabatic desisa reminiscent 1930s Kinner Ryan span placa Spans 575 in$ 600 No707 02F Tracker CL Scale nssin-045-pocoerad model Grossman design Spans 35 in$ 325 No706 PGMTroieor FE vbbnrpocoemed trainer ideal tar introdootion ROD flying Spans lOin$ 150 NO760 AIr Cadet PC FE Ion flen/trainer 101020 passer Stick-amnd-tinnoe model reoolleots Cessna 0rd Gag opans 3805 400 No710 0010kb 360 RC Pylon racer Spas timer intermediate bonder//tiler Can racod coilS CL PC 20 power Foam coing spans 45 g 550 No711 Fokker 611 Type FE RGG Robber-pocoered Galdeer Stick model Rnmenmsnenf WWI German tIghter Spans 235 n$ 200 No712 Seletet Redi6aL-SOTP PC Spod Scale version Finnish yinke military trainer FonOoadraorZenoah power spans 04 2 plan sheets 5 1500 No713Mig29 FECatapolt Glider Patterned aher Rossian dnmonstraforflnssnatCleveland Ohio 1551 Spans 13 n$ 225 No754 Mod 000k PC acem-toendly Sport flier reloand aloco flight Eaoells loss sloss maneovers Far 25-30 paoer Spans 000 2 plan sheets0 500 No 710 Stephens hero PC Goader scale aerobatic plane spans 725 in. oses 75/90 passer Dylan sheets0 1375 No 716 Slow Poker FE Record-sethng tntdoonHLG spans 245 Wood stroct s meinfarcadssithcaonfihem200 No7l7onetlaeaoRCCawhat P1000 RCSparSCombattlierfrom Rossiator3Sooengine 3-channels spannd75-in0 575 Ne 716 Lito Bipe SC Onry aerobatic fan fly Sipa design 1050 Honfon Spans 665-in 103045 posse 2 plan sheets5 600 No719 Aria PC Eiectrio pedoecance/spart Girder Far 56 direct- dove motor F nor ohanneis Spans 65 Seeable Sap sestem 2 plan sheets5 725 No72OMlnalewan FE FrankZalos popotaraii-baisa-oovered robben-possemed madeitakenfram PapalarScience Jane 1041 SpansDO in$ 200 Ne 721 Lil Feller PC mid-coins ton fly sport piann Folly aernbntio 4-channel 000101 40-51 passer Spans 450 650 NO733 Laaep Mets FE Doohied 70-sq-in Iron 04ntvnian design Far Mini-6 motarand 50 mAS batfemies Spans 15/5 225 Ne 723 Aalo 67 CL Designed Eviand Fiat Zossada Ada Poanan intended Short Aerobatice Program Fo 15 passer 5pans 36/a-in$ 400 No 724 Sonret Weapon PC Gianf Scale mid-ssiog aerabatlo ship taken original 1947 Slant design Spans aO-in 2 plan sheets$ 1600 No 725 Cordisel 69 CL Stonter coith niassic 1 SSSs linas 0100124 Stool ships eon assarded 20 appearanoe paints Spans 62/n-in 60 posse$ 1125 No 726 Cle-5hDee PC EieoOo-passered ight-sseight Cessna look-alike Ish flyer designed 035 motor 6-cod pack spans 52-in 2 plan sheets$ 1125 No 727 CortIs SF7C Seahawk CL Moihi-polpose bissinger C compete both Profile Scale Saw Carher Spans 32-in Far 35-40 passer$ 400 Ne 726 ElosIds SotellOc 450 FE Electric cenvession Can bout far 6-cell Class 07-cell Class Spans 56 r-n Fan Astroflife 035 Cobalt motor$ 725 No 72OTl6erCat PC Eiectnc73-n-span evolofian nI TigerKitten LococoingsportlaerobalictorCobaitwmotorand 261200 MASceils Dylansheets0 1400 No720 Seopper CL Profile stonIer boned ciannin 1504/cA Snapper 46/s-inspan roidoolog 25-35 power5 550 No731 Feothar Merehont FE Old-Tinner FE am PC Assist 72 spani25 passer Easy folly eaceptianaily wnde stall tolerance 2 plan sheets$ 1075 F Circle numbers plans wish order best hsndling please include requeSts payment tor some other service piano order No phone orderg call 703 435-0750 order assisfasce ONLYI II II II II II II II I_I II III Make check money order payable US funds drawn US bank ModelAviation AMA 1810 I Samuel Morse Dr Reston vA 22090 Please allow 3 6 weeks deliveryI Please print carefullyEnclosed $ _________________________________ NAMEAMA No STREETI II CITYI II STATEZIPI L.1 193262310314326332386447539578 588598603646650654661667674675 o 676677678679681684686688689692 O696697699700701702703705706707 708709710711712713714715716717 718719720721722723724725726727 728729730731732 92 Plan price includes first class postage US delivery Air Mail Over 300 miles orders non-US addresses please add $250 Air Mail postage handling plan 182 Model Aviation ncrease rubber weight shifts CC aft Again little concern model could important others Finally longer motor compared started will need braiding avoid CG shift between wound unwound big problem ignored either Questions welcome inued Letters Editor Continued page 167 water want predict failure will manifest itself What pressure will home builder actually maintain can violent rupture also very possible Such accident may never happen article AMA MA has become liable am guilty author wanting put seemingly useful throwaways use have air conditioning contractor life now work Lennox Industries Inc major manufacturer air conditioning equipment time used produce portable air tanks filling flat tires until recognized liability reusing cans began removing tank valves puncturing safety patch scroungers could use cans unsafe pressure applications second concern obvious open-belt drive Inexpensive covers available could made should have part article Enough obvious error Daniel D Kautz Piano Texas Possible am 15 years old have flying model airplanes about three years now After reading Letters Editor numerous times different issues MA decided send thoughts let other people see person age thinks about model aviation Anyway idea take tail section V tail attach wingtips normal plane would no need tail section control surfaces would V wing Up would normal V tail except both Vs would up position down would same Along needing tail section would no need ailerons roll simply make V go up other down banking climb raise V other Well thoughts 15-yearold very anxious see whether type design will work Derek Walton Port Neches Texas PS imagined plane have tricyclestyle landing gear pusher 9 03 0 -3ChJ 93 C C53 9 0 90 - w g-3 00 ccn 2 9s 530 C9 0 V 0 93 C 3 9 o 9d2 -53 9 53C 0 no. 00 039 C53 53 5393 90 - 0 930 -9 9 0 92115 0ChJ adO 6053 0 Co CUC 9 0 0 NE i 5 LLfl
Edition: Model Aviation - 1993/03
Page Numbers: 5, 167, 182
Letters Editor Send 18 November issues article concerning ~Junk Box Air Compressors piqued interest involved both avocation profession Im devoted RC modeler weekend during week am senior development engineer largest compressor manufacturer world Ingersoll-Rand Co have spent last 18 years developing compressors related equipment mostly 50-500 horse power diesel portables applaud authors spirit ingenuity feel compelled discourage fellow readers building such device As presented details design ignore some very important safety requirements compressed air systems required law commercially produced systems prudent design demands inclusion home-built unit First foremost safety relief valve absolute must compressor compressed air system cannot either/or choice presented pressure switch used cycle compressor between set pressures can fail causing pressure rise until something explodes author article discussed fact explosion could occur compressor allowed run unchecked did insist use relief valve pressure switch present pressure switch good working order explosion could occur during first use trying adjust switch settings Also relief valve must sized properly ASME code states valve must able flow full output compressor 110% valve set pressure Temperature compensation required sizing valve also have experienced relief valve failure cases valve oversized 50% due chattering valve seat because insufficient flow As can see just choosing correct valve involves some expertise people attempting project would have no reason possess second major hazard involves use Freon tank receiver vessel Freon propane tanks designed intended code-rated used air system major problem water collects tanks causes corrosion Continued page 167 JETS ON DISPLAY ORLANDO FL BVM /WINTER PRINGS ORLANQI4rJARORT March 1993 5 DUST DEVIL Slow Speed Aerobatics Trainer Uk Stability Super Short Take Off & Landing 76 Length 60 eq $13995 CHINOOK Primary TrainerFun Fly Sport Plane iMAA LegalAerobatic Trainer pen 81 Area 1110 sq $11995 Both have JT88 Airfoil WHIRLWIND AIRCRAFT 3065 Windjammer Dr Colorado Springs CO 80920 719 2607622 7 da week VISA/MO Junk Box Air Compressor Critique F-86 F-16 Maverick Viper Aggressor necessary accessories call appointment Aria/Winter Hunton Continued page 13 Aria gets job done eight cells dual packs use Hobby Lobby dual charger charges two packs simultane ously has dual ammeters variety rates available After selecting plain BB motor variety battery packs useful various occasions cells windy hot day example Perspective short-wing Aria compatible power models typical mixed-use flying field version excellent transitioning power electric will penetrate handle strong wind no problem flew short wing club field Sunday no else would fly because wind will also react thermals excellent flight characteristics help greatly adjusting electric much flight regime out high far away flier After have made transition power electric looking expand experience capability soaring long wing will provide better response weak lift give extended flights sometimes seeming last long wish Because BEC becomes time-limiting factor need least 250-mAb battery pack receiver exploit Arias full potential Build both wings have optimum occasions moods interchangeable wings battery packs Either Aria can flown out back pea patch will give plenty solid environmentally compatible enjoyment ers Editor Continued page 5 dryer used tanks have no provision draining water receiver should drained daily prevent rust people have killed severely injured over years air tanks have exploded because fracture propagating severe rust pit tank wall must know pressure rating intended tank ensure safety valve set below pressure Most tanks Freon propane variety marked concerning pressure systems commercially available US have tanks constructed under auspices ASME rated code-stamped licensees organization must build own compressor should obtain ASME-coded tank petcock drain Probably easiest way to get portable air tank such would take service station get air Sears various auto parts stores sell quite hazardous valve tank issues encourage user use proper pipe fittings pressures involved Check pressure rating fitting pipe hose intend use Soldered joints should used An adequate belt guard must also Compressed air wonderful versatile power source can deadly hands uninformed user have unpleasant task sorting through gruesome accident scene photos once during career result carelessness usually friendly medium Compressed air can kill heartbeat believe summarize believe members need compressors would much safer satisfied purchase properly engineered manufactured commercially produced compressor realize can expensive new alternatively can readily find used units sale swapand trade-type papers such units have enough life left serve modeler homeowner well years want new will have go competitors company stopped making small homeowner-type units couple years ago dont want sell unit ax have grind help ensure members experience compressors safe productive Randy Little Mocksville North Carolina Input Junk Box Air Compressors am forced write regard article Junk Box Air Compressor Joel Hamm published November 1992 issue ModelAviation page 188 article certainly slipped past safety committee horrified see such information examples displayed promoted safety-conscious publication such MA Please please please Print retraction and/or safety warning readers highest concern use discarded Freon can absolutely illegal federal law reuse cans purpose involving internal pressure liquid refrigerant can design does incorporate safety blow-out patch case can becomes involved extreme pressures such fire problem device actually can heavy certified read expensive pressure vessel sidewalls very thin stamped steel Air compression creates moisture condensation admitted article need dryers system moisture collects can Certified compression tanks have valve drain collected moisture Freon can does collected moisture will corrode very thin walls seams Freon can Thus some point time failure will result Most likely slow leak rusty Continued page 182 P40 WARHAWK Made USA SPECIFICATIONS WING 5PAN 60 ENGINE SIZE60 2-EIROKE WEIGHT78 LBS 111170 PRICE$16000 ALL KITS FEATURE 11AM LAID FIBERGLASS FUSEL4GEPANEL UNES B SCALE DETAILSFOAM CORE WINGS MACHINE CITE FORMERS & BUIKIIEADS SEE YOUR LOCAL DEALER OR G4IL HOBBY HANGAR 606-283-5746 FOR IMMEDU7E DEUVFJtY DEALER INQUIRIFS WELCOME WEACCEPT VISA MASZERCARD & DISCOVER CARDS WE GL4DLYSHIP C OD SHIPPING & HANDLJNG $500 PER KIT COmINEIeTAL USA OTIIER AREAS CALL KEA7UCKYRFSIDEN7S ADD 6% SALES TAX HOBBY HANGAR ISA FULL SER VICE HOBBY SHOP WiTH OVER 11000 ITEMS IN STOCK CATALOGS AVAILABLE $400 EACH WIREBATE ON FIRST ORDER SPECIBY PLANEHEUCOTER OR CAR HANGAR EXCiLICS/VE 057W1E/TOR FIBER SCALE MODELS UELLOYDAVE RW0t KY 41042 606-283-5746 PV*W 606-283-5889 FAX March 1993 167 FOCKE WULF 190 Made USA SPECIFICATIONS WiNG SPAN 65 ENGINE SIZE60510 2-EIROKE VJ-I20 4-STEOKE WEIGHT9-10 LBS IN1RO PRICE$18500 r-4i iIiUNLIEK SPECIFICATIONS WINGSPAN 60 ENGINE SIZE60 2-SEROKE WEIGHTB-AS LBS IA UESMVA 150Made USA SPECIFICATIONS WINGSPAN 65 ENGINE SIZE45-60 2-STEOKE WEIGHT7-75 LBS FULL-SIZE PLANS 732 Long-Wing ARIA$475 Wing plan ARIA #719 Sept 92 MA designed Bill Winter 99-in span 63-oz Variable flap system Compared short wing Aria has increased LID lower sink rate flatter turns Aggressive soarer Forgiving nice fly trainer 10-6 11-6 folding prop Four channels 1 plan sheet No 193 StIletto CL Stool model McDonald nnnner 1976 1580 1962 FAI World Chanrpn$ 375 No262 Croshnoster CL crash-prool rome Tcoosjzos1S/SSand 35/4Spoooer$ 125 No3101930 Fleel Blylsee PC Spon Scale 35/40 posset nod 4-channel Sponn 56 1/5 scale 2 plan sheets$ 025 No 314 Oroke II PC Ken Willard s hying boat ton 3-channel 15 ponoer Fly fonn lend osith removable sean$ 375 No 326 Taylor Cob RC Don Srull s Schoolyani Scala 10045 ponhen 2-3 channel Spann 50 in$ 350 No 332 Zephyr RC semall 2-channel Glider tam hand-loonch taco thernnal am siope nooring$ 200 No 306 Loser 200 PC Sport Scale replica channpionshiy Aerobatic lion FordS posse 45 channol an sheets0 1075 No 447 112A Miss Anrerleos PC Old Tcner 1/28 Tenaca model 1am 045 51050 2channols0 650 No 539 Siedt0r Slow-Motion 10 PC Taillesstlying ooing ton 15 passer Spans 60 3 channel0 350 No578 Oehwoloor 1266 PC Goader-scale Sailplane Spans 125 2 plan Sheets5 1475 No301 Gee Bee Model Y PC Golden Age Racer Spans 72-in 15 scale tar 60 passes 3 plan sheets$ 1175 No 009 Mortob PC Slepe-Soaring Salplane Spans 41 in. 2 PC channels0 425 Ne 096 Coronet 100 PCAasst Sid-Tinne enlarged 150% Spans 72 FOr 40- 4-strakeI30- 2-etlake0 650 No603 Sparrow Idasek P30 FE Coerpetition robber-pacoen plane voon 1907 NaIn Spans 3D in0 225 No 646 WIntee Howk FE Robber-passer Cooped Hicet contpntitioo plane Spans 47 in$ 375 No606 4760 BC Opeelol PC Aenobatic sped plane 10140 pooser Spans Olin 3 pIne sheets$ 1075 No 604 Torsenot RCTrainer/Spadsterstyledaherthe F14 Spano6o Far 40/61 passer 4 plan sheet5 1525 No 661 Etttbry-Onotie FE Enrbrya End orance robber passer plane Spans 205 in$ 200 No667 AT4 CL Senriscale profile Stonten tar 35140 passer Spans 47 in$ 575 No670 BDF1 FEhain-lailed spoatlier tar Coo 02 Pee Wee engine Spans 25 ing 225 No676 Filliner PC nainelentrin Orgo-coing Sport ship designed tar Shine Imp 30 nnotar Hen tricycle gear spans 40 ing 400 No O77TItoedorhItd CL StonIer tar 20-35 pooerTcoa plan sheetS dracon trap original 1982 Veca kit Spans 545g 6BeseBeo FFpoestCoastgostonanGotdoardesignSpanslOin8 150 No 676619 BIngol Large PC Spoosler spanogS 120-24 passer 2 plan sheets5 1700 No601 1969 Bade 604 FE Robber Scale model spans 105 in$ 325 Ne 684 Otaggerwlng Beneb 3-Channel PC Schaalyard-Soale Si-coins Sportster Far 049 passer Spann0 375 No606 Feller PC Panern-type spaS plane Far 2-ar 4-cycie passer Spans 65 in0 725 No606 Stealth Glider FE robberband-loonohed faandbalca Canard Catepolcotealth Glider cecoba Span0 200 No 66pmoenas Morse Ossoot SdC PC 15 scale biplane 50 oncoer Spans 63 3 plan sheets5 1575 Ne6923 Metorgeooter PC high pedonnannooailplane Spans 110 in2 plan sheets5 1150 No 696 Pole Cot FE P30 Class AMA Senior record holder Spans 31 in0 225 60697 Tlgerklttee 6 PC high performance 5pad Aenobatia design FOr 05115 Cobalt eleciric passer Spans 54 n$ 1000 No660TepCot60L-1 FE PobberFAl lndaorStiokGliderSoIdOAMA Cat FlOand Stick National Records Spans 13125 2 plan sheets$ 300 60760 Raedps 0150 PC economical cematile Span Trainer Ideal tar 10 passer Weighs 33-na Spans 50 in5 575 No701 Jompie Gee SC high performance Spanstar designed tartan fly ecents Weighs 3-lb spans 40 40-45 posse9 725 No702 Hainkel eE 16 FE Scale model 011524 German nranoplann Far CiLine Mini-6 geassd 01oct60 motor Spaes2a e$ 200 No703 Cleedhoppor PC Grant Scale 5padstor reminiscent iSSOs heath hosseborit Spans Shin Far 50 passer 2 plan sheets$ 1450 Ne 760 ZeeSh FEHand-Leonch Gliderfomserioos competition Wing OT Spans 18 35-3e grams5 200 No760 4-Geen PC lass coing 411-50-pacoered Sport Aerabatic desisa reminiscent 1930s Kinner Ryan span placa Spans 575 in$ 600 No707 02F Tracker CL Scale nssin-045-pocoerad model Grossman design Spans 35 in$ 325 No706 PGMTroieor FE vbbnrpocoemed trainer ideal tar introdootion ROD flying Spans lOin$ 150 NO760 AIr Cadet PC FE Ion flen/trainer 101020 passer Stick-amnd-tinnoe model reoolleots Cessna 0rd Gag opans 3805 400 No710 0010kb 360 RC Pylon racer Spas timer intermediate bonder//tiler Can racod coilS CL PC 20 power Foam coing spans 45 g 550 No711 Fokker 611 Type FE RGG Robber-pocoered Galdeer Stick model Rnmenmsnenf WWI German tIghter Spans 235 n$ 200 No712 Seletet Redi6aL-SOTP PC Spod Scale version Finnish yinke military trainer FonOoadraorZenoah power spans 04 2 plan sheets 5 1500 No713Mig29 FECatapolt Glider Patterned aher Rossian dnmonstraforflnssnatCleveland Ohio 1551 Spans 13 n$ 225 No754 Mod 000k PC acem-toendly Sport flier reloand aloco flight Eaoells loss sloss maneovers Far 25-30 paoer Spans 000 2 plan sheets0 500 No 710 Stephens hero PC Goader scale aerobatic plane spans 725 in. oses 75/90 passer Dylan sheets0 1375 No 716 Slow Poker FE Record-sethng tntdoonHLG spans 245 Wood stroct s meinfarcadssithcaonfihem200 No7l7onetlaeaoRCCawhat P1000 RCSparSCombattlierfrom Rossiator3Sooengine 3-channels spannd75-in0 575 Ne 716 Lito Bipe SC Onry aerobatic fan fly Sipa design 1050 Honfon Spans 665-in 103045 posse 2 plan sheets5 600 No719 Aria PC Eiectrio pedoecance/spart Girder Far 56 direct- dove motor F nor ohanneis Spans 65 Seeable Sap sestem 2 plan sheets5 725 No72OMlnalewan FE FrankZalos popotaraii-baisa-oovered robben-possemed madeitakenfram PapalarScience Jane 1041 SpansDO in$ 200 Ne 721 Lil Feller PC mid-coins ton fly sport piann Folly aernbntio 4-channel 000101 40-51 passer Spans 450 650 NO733 Laaep Mets FE Doohied 70-sq-in Iron 04ntvnian design Far Mini-6 motarand 50 mAS batfemies Spans 15/5 225 Ne 723 Aalo 67 CL Designed Eviand Fiat Zossada Ada Poanan intended Short Aerobatice Program Fo 15 passer 5pans 36/a-in$ 400 No 724 Sonret Weapon PC Gianf Scale mid-ssiog aerabatlo ship taken original 1947 Slant design Spans aO-in 2 plan sheets$ 1600 No 725 Cordisel 69 CL Stonter coith niassic 1 SSSs linas 0100124 Stool ships eon assarded 20 appearanoe paints Spans 62/n-in 60 posse$ 1125 No 726 Cle-5hDee PC EieoOo-passered ight-sseight Cessna look-alike Ish flyer designed 035 motor 6-cod pack spans 52-in 2 plan sheets$ 1125 No 727 CortIs SF7C Seahawk CL Moihi-polpose bissinger C compete both Profile Scale Saw Carher Spans 32-in Far 35-40 passer$ 400 Ne 726 ElosIds SotellOc 450 FE Electric cenvession Can bout far 6-cell Class 07-cell Class Spans 56 r-n Fan Astroflife 035 Cobalt motor$ 725 No 72OTl6erCat PC Eiectnc73-n-span evolofian nI TigerKitten LococoingsportlaerobalictorCobaitwmotorand 261200 MASceils Dylansheets0 1400 No720 Seopper CL Profile stonIer boned ciannin 1504/cA Snapper 46/s-inspan roidoolog 25-35 power5 550 No731 Feothar Merehont FE Old-Tinner FE am PC Assist 72 spani25 passer Easy folly eaceptianaily wnde stall tolerance 2 plan sheets$ 1075 F Circle numbers plans wish order best hsndling please include requeSts payment tor some other service piano order No phone orderg call 703 435-0750 order assisfasce ONLYI II II II II II II II I_I II III Make check money order payable US funds drawn US bank ModelAviation AMA 1810 I Samuel Morse Dr Reston vA 22090 Please allow 3 6 weeks deliveryI Please print carefullyEnclosed $ _________________________________ NAMEAMA No STREETI II CITYI II STATEZIPI L.1 193262310314326332386447539578 588598603646650654661667674675 o 676677678679681684686688689692 O696697699700701702703705706707 708709710711712713714715716717 718719720721722723724725726727 728729730731732 92 Plan price includes first class postage US delivery Air Mail Over 300 miles orders non-US addresses please add $250 Air Mail postage handling plan 182 Model Aviation ncrease rubber weight shifts CC aft Again little concern model could important others Finally longer motor compared started will need braiding avoid CG shift between wound unwound big problem ignored either Questions welcome inued Letters Editor Continued page 167 water want predict failure will manifest itself What pressure will home builder actually maintain can violent rupture also very possible Such accident may never happen article AMA MA has become liable am guilty author wanting put seemingly useful throwaways use have air conditioning contractor life now work Lennox Industries Inc major manufacturer air conditioning equipment time used produce portable air tanks filling flat tires until recognized liability reusing cans began removing tank valves puncturing safety patch scroungers could use cans unsafe pressure applications second concern obvious open-belt drive Inexpensive covers available could made should have part article Enough obvious error Daniel D Kautz Piano Texas Possible am 15 years old have flying model airplanes about three years now After reading Letters Editor numerous times different issues MA decided send thoughts let other people see person age thinks about model aviation Anyway idea take tail section V tail attach wingtips normal plane would no need tail section control surfaces would V wing Up would normal V tail except both Vs would up position down would same Along needing tail section would no need ailerons roll simply make V go up other down banking climb raise V other Well thoughts 15-yearold very anxious see whether type design will work Derek Walton Port Neches Texas PS imagined plane have tricyclestyle landing gear pusher 9 03 0 -3ChJ 93 C C53 9 0 90 - w g-3 00 ccn 2 9s 530 C9 0 V 0 93 C 3 9 o 9d2 -53 9 53C 0 no. 00 039 C53 53 5393 90 - 0 930 -9 9 0 92115 0ChJ adO 6053 0 Co CUC 9 0 0 NE i 5 LLfl
Edition: Model Aviation - 1993/03
Page Numbers: 5, 167, 182
Letters Editor Send 18 November issues article concerning ~Junk Box Air Compressors piqued interest involved both avocation profession Im devoted RC modeler weekend during week am senior development engineer largest compressor manufacturer world Ingersoll-Rand Co have spent last 18 years developing compressors related equipment mostly 50-500 horse power diesel portables applaud authors spirit ingenuity feel compelled discourage fellow readers building such device As presented details design ignore some very important safety requirements compressed air systems required law commercially produced systems prudent design demands inclusion home-built unit First foremost safety relief valve absolute must compressor compressed air system cannot either/or choice presented pressure switch used cycle compressor between set pressures can fail causing pressure rise until something explodes author article discussed fact explosion could occur compressor allowed run unchecked did insist use relief valve pressure switch present pressure switch good working order explosion could occur during first use trying adjust switch settings Also relief valve must sized properly ASME code states valve must able flow full output compressor 110% valve set pressure Temperature compensation required sizing valve also have experienced relief valve failure cases valve oversized 50% due chattering valve seat because insufficient flow As can see just choosing correct valve involves some expertise people attempting project would have no reason possess second major hazard involves use Freon tank receiver vessel Freon propane tanks designed intended code-rated used air system major problem water collects tanks causes corrosion Continued page 167 JETS ON DISPLAY ORLANDO FL BVM /WINTER PRINGS ORLANQI4rJARORT March 1993 5 DUST DEVIL Slow Speed Aerobatics Trainer Uk Stability Super Short Take Off & Landing 76 Length 60 eq $13995 CHINOOK Primary TrainerFun Fly Sport Plane iMAA LegalAerobatic Trainer pen 81 Area 1110 sq $11995 Both have JT88 Airfoil WHIRLWIND AIRCRAFT 3065 Windjammer Dr Colorado Springs CO 80920 719 2607622 7 da week VISA/MO Junk Box Air Compressor Critique F-86 F-16 Maverick Viper Aggressor necessary accessories call appointment Aria/Winter Hunton Continued page 13 Aria gets job done eight cells dual packs use Hobby Lobby dual charger charges two packs simultane ously has dual ammeters variety rates available After selecting plain BB motor variety battery packs useful various occasions cells windy hot day example Perspective short-wing Aria compatible power models typical mixed-use flying field version excellent transitioning power electric will penetrate handle strong wind no problem flew short wing club field Sunday no else would fly because wind will also react thermals excellent flight characteristics help greatly adjusting electric much flight regime out high far away flier After have made transition power electric looking expand experience capability soaring long wing will provide better response weak lift give extended flights sometimes seeming last long wish Because BEC becomes time-limiting factor need least 250-mAb battery pack receiver exploit Arias full potential Build both wings have optimum occasions moods interchangeable wings battery packs Either Aria can flown out back pea patch will give plenty solid environmentally compatible enjoyment ers Editor Continued page 5 dryer used tanks have no provision draining water receiver should drained daily prevent rust people have killed severely injured over years air tanks have exploded because fracture propagating severe rust pit tank wall must know pressure rating intended tank ensure safety valve set below pressure Most tanks Freon propane variety marked concerning pressure systems commercially available US have tanks constructed under auspices ASME rated code-stamped licensees organization must build own compressor should obtain ASME-coded tank petcock drain Probably easiest way to get portable air tank such would take service station get air Sears various auto parts stores sell quite hazardous valve tank issues encourage user use proper pipe fittings pressures involved Check pressure rating fitting pipe hose intend use Soldered joints should used An adequate belt guard must also Compressed air wonderful versatile power source can deadly hands uninformed user have unpleasant task sorting through gruesome accident scene photos once during career result carelessness usually friendly medium Compressed air can kill heartbeat believe summarize believe members need compressors would much safer satisfied purchase properly engineered manufactured commercially produced compressor realize can expensive new alternatively can readily find used units sale swapand trade-type papers such units have enough life left serve modeler homeowner well years want new will have go competitors company stopped making small homeowner-type units couple years ago dont want sell unit ax have grind help ensure members experience compressors safe productive Randy Little Mocksville North Carolina Input Junk Box Air Compressors am forced write regard article Junk Box Air Compressor Joel Hamm published November 1992 issue ModelAviation page 188 article certainly slipped past safety committee horrified see such information examples displayed promoted safety-conscious publication such MA Please please please Print retraction and/or safety warning readers highest concern use discarded Freon can absolutely illegal federal law reuse cans purpose involving internal pressure liquid refrigerant can design does incorporate safety blow-out patch case can becomes involved extreme pressures such fire problem device actually can heavy certified read expensive pressure vessel sidewalls very thin stamped steel Air compression creates moisture condensation admitted article need dryers system moisture collects can Certified compression tanks have valve drain collected moisture Freon can does collected moisture will corrode very thin walls seams Freon can Thus some point time failure will result Most likely slow leak rusty Continued page 182 P40 WARHAWK Made USA SPECIFICATIONS WING 5PAN 60 ENGINE SIZE60 2-EIROKE WEIGHT78 LBS 111170 PRICE$16000 ALL KITS FEATURE 11AM LAID FIBERGLASS FUSEL4GEPANEL UNES B SCALE DETAILSFOAM CORE WINGS MACHINE CITE FORMERS & BUIKIIEADS SEE YOUR LOCAL DEALER OR G4IL HOBBY HANGAR 606-283-5746 FOR IMMEDU7E DEUVFJtY DEALER INQUIRIFS WELCOME WEACCEPT VISA MASZERCARD & DISCOVER CARDS WE GL4DLYSHIP C OD SHIPPING & HANDLJNG $500 PER KIT COmINEIeTAL USA OTIIER AREAS CALL KEA7UCKYRFSIDEN7S ADD 6% SALES TAX HOBBY HANGAR ISA FULL SER VICE HOBBY SHOP WiTH OVER 11000 ITEMS IN STOCK CATALOGS AVAILABLE $400 EACH WIREBATE ON FIRST ORDER SPECIBY PLANEHEUCOTER OR CAR HANGAR EXCiLICS/VE 057W1E/TOR FIBER SCALE MODELS UELLOYDAVE RW0t KY 41042 606-283-5746 PV*W 606-283-5889 FAX March 1993 167 FOCKE WULF 190 Made USA SPECIFICATIONS WiNG SPAN 65 ENGINE SIZE60510 2-EIROKE VJ-I20 4-STEOKE WEIGHT9-10 LBS IN1RO PRICE$18500 r-4i iIiUNLIEK SPECIFICATIONS WINGSPAN 60 ENGINE SIZE60 2-SEROKE WEIGHTB-AS LBS IA UESMVA 150Made USA SPECIFICATIONS WINGSPAN 65 ENGINE SIZE45-60 2-STEOKE WEIGHT7-75 LBS FULL-SIZE PLANS 732 Long-Wing ARIA$475 Wing plan ARIA #719 Sept 92 MA designed Bill Winter 99-in span 63-oz Variable flap system Compared short wing Aria has increased LID lower sink rate flatter turns Aggressive soarer Forgiving nice fly trainer 10-6 11-6 folding prop Four channels 1 plan sheet No 193 StIletto CL Stool model McDonald nnnner 1976 1580 1962 FAI World Chanrpn$ 375 No262 Croshnoster CL crash-prool rome Tcoosjzos1S/SSand 35/4Spoooer$ 125 No3101930 Fleel Blylsee PC Spon Scale 35/40 posset nod 4-channel Sponn 56 1/5 scale 2 plan sheets$ 025 No 314 Oroke II PC Ken Willard s hying boat ton 3-channel 15 ponoer Fly fonn lend osith removable sean$ 375 No 326 Taylor Cob RC Don Srull s Schoolyani Scala 10045 ponhen 2-3 channel Spann 50 in$ 350 No 332 Zephyr RC semall 2-channel Glider tam hand-loonch taco thernnal am siope nooring$ 200 No 306 Loser 200 PC Sport Scale replica channpionshiy Aerobatic lion FordS posse 45 channol an sheets0 1075 No 447 112A Miss Anrerleos PC Old Tcner 1/28 Tenaca model 1am 045 51050 2channols0 650 No 539 Siedt0r Slow-Motion 10 PC Taillesstlying ooing ton 15 passer Spans 60 3 channel0 350 No578 Oehwoloor 1266 PC Goader-scale Sailplane Spans 125 2 plan Sheets5 1475 No301 Gee Bee Model Y PC Golden Age Racer Spans 72-in 15 scale tar 60 passes 3 plan sheets$ 1175 No 009 Mortob PC Slepe-Soaring Salplane Spans 41 in. 2 PC channels0 425 Ne 096 Coronet 100 PCAasst Sid-Tinne enlarged 150% Spans 72 FOr 40- 4-strakeI30- 2-etlake0 650 No603 Sparrow Idasek P30 FE Coerpetition robber-pacoen plane voon 1907 NaIn Spans 3D in0 225 No 646 WIntee Howk FE Robber-passer Cooped Hicet contpntitioo plane Spans 47 in$ 375 No606 4760 BC Opeelol PC Aenobatic sped plane 10140 pooser Spans Olin 3 pIne sheets$ 1075 No 604 Torsenot RCTrainer/Spadsterstyledaherthe F14 Spano6o Far 40/61 passer 4 plan sheet5 1525 No 661 Etttbry-Onotie FE Enrbrya End orance robber passer plane Spans 205 in$ 200 No667 AT4 CL Senriscale profile Stonten tar 35140 passer Spans 47 in$ 575 No670 BDF1 FEhain-lailed spoatlier tar Coo 02 Pee Wee engine Spans 25 ing 225 No676 Filliner PC nainelentrin Orgo-coing Sport ship designed tar Shine Imp 30 nnotar Hen tricycle gear spans 40 ing 400 No O77TItoedorhItd CL StonIer tar 20-35 pooerTcoa plan sheetS dracon trap original 1982 Veca kit Spans 545g 6BeseBeo FFpoestCoastgostonanGotdoardesignSpanslOin8 150 No 676619 BIngol Large PC Spoosler spanogS 120-24 passer 2 plan sheets5 1700 No601 1969 Bade 604 FE Robber Scale model spans 105 in$ 325 Ne 684 Otaggerwlng Beneb 3-Channel PC Schaalyard-Soale Si-coins Sportster Far 049 passer Spann0 375 No606 Feller PC Panern-type spaS plane Far 2-ar 4-cycie passer Spans 65 in0 725 No606 Stealth Glider FE robberband-loonohed faandbalca Canard Catepolcotealth Glider cecoba Span0 200 No 66pmoenas Morse Ossoot SdC PC 15 scale biplane 50 oncoer Spans 63 3 plan sheets5 1575 Ne6923 Metorgeooter PC high pedonnannooailplane Spans 110 in2 plan sheets5 1150 No 696 Pole Cot FE P30 Class AMA Senior record holder Spans 31 in0 225 60697 Tlgerklttee 6 PC high performance 5pad Aenobatia design FOr 05115 Cobalt eleciric passer Spans 54 n$ 1000 No660TepCot60L-1 FE PobberFAl lndaorStiokGliderSoIdOAMA Cat FlOand Stick National Records Spans 13125 2 plan sheets$ 300 60760 Raedps 0150 PC economical cematile Span Trainer Ideal tar 10 passer Weighs 33-na Spans 50 in5 575 No701 Jompie Gee SC high performance Spanstar designed tartan fly ecents Weighs 3-lb spans 40 40-45 posse9 725 No702 Hainkel eE 16 FE Scale model 011524 German nranoplann Far CiLine Mini-6 geassd 01oct60 motor Spaes2a e$ 200 No703 Cleedhoppor PC Grant Scale 5padstor reminiscent iSSOs heath hosseborit Spans Shin Far 50 passer 2 plan sheets$ 1450 Ne 760 ZeeSh FEHand-Leonch Gliderfomserioos competition Wing OT Spans 18 35-3e grams5 200 No760 4-Geen PC lass coing 411-50-pacoered Sport Aerabatic desisa reminiscent 1930s Kinner Ryan span placa Spans 575 in$ 600 No707 02F Tracker CL Scale nssin-045-pocoerad model Grossman design Spans 35 in$ 325 No706 PGMTroieor FE vbbnrpocoemed trainer ideal tar introdootion ROD flying Spans lOin$ 150 NO760 AIr Cadet PC FE Ion flen/trainer 101020 passer Stick-amnd-tinnoe model reoolleots Cessna 0rd Gag opans 3805 400 No710 0010kb 360 RC Pylon racer Spas timer intermediate bonder//tiler Can racod coilS CL PC 20 power Foam coing spans 45 g 550 No711 Fokker 611 Type FE RGG Robber-pocoered Galdeer Stick model Rnmenmsnenf WWI German tIghter Spans 235 n$ 200 No712 Seletet Redi6aL-SOTP PC Spod Scale version Finnish yinke military trainer FonOoadraorZenoah power spans 04 2 plan sheets 5 1500 No713Mig29 FECatapolt Glider Patterned aher Rossian dnmonstraforflnssnatCleveland Ohio 1551 Spans 13 n$ 225 No754 Mod 000k PC acem-toendly Sport flier reloand aloco flight Eaoells loss sloss maneovers Far 25-30 paoer Spans 000 2 plan sheets0 500 No 710 Stephens hero PC Goader scale aerobatic plane spans 725 in. oses 75/90 passer Dylan sheets0 1375 No 716 Slow Poker FE Record-sethng tntdoonHLG spans 245 Wood stroct s meinfarcadssithcaonfihem200 No7l7onetlaeaoRCCawhat P1000 RCSparSCombattlierfrom Rossiator3Sooengine 3-channels spannd75-in0 575 Ne 716 Lito Bipe SC Onry aerobatic fan fly Sipa design 1050 Honfon Spans 665-in 103045 posse 2 plan sheets5 600 No719 Aria PC Eiectrio pedoecance/spart Girder Far 56 direct- dove motor F nor ohanneis Spans 65 Seeable Sap sestem 2 plan sheets5 725 No72OMlnalewan FE FrankZalos popotaraii-baisa-oovered robben-possemed madeitakenfram PapalarScience Jane 1041 SpansDO in$ 200 Ne 721 Lil Feller PC mid-coins ton fly sport piann Folly aernbntio 4-channel 000101 40-51 passer Spans 450 650 NO733 Laaep Mets FE Doohied 70-sq-in Iron 04ntvnian design Far Mini-6 motarand 50 mAS batfemies Spans 15/5 225 Ne 723 Aalo 67 CL Designed Eviand Fiat Zossada Ada Poanan intended Short Aerobatice Program Fo 15 passer 5pans 36/a-in$ 400 No 724 Sonret Weapon PC Gianf Scale mid-ssiog aerabatlo ship taken original 1947 Slant design Spans aO-in 2 plan sheets$ 1600 No 725 Cordisel 69 CL Stonter coith niassic 1 SSSs linas 0100124 Stool ships eon assarded 20 appearanoe paints Spans 62/n-in 60 posse$ 1125 No 726 Cle-5hDee PC EieoOo-passered ight-sseight Cessna look-alike Ish flyer designed 035 motor 6-cod pack spans 52-in 2 plan sheets$ 1125 No 727 CortIs SF7C Seahawk CL Moihi-polpose bissinger C compete both Profile Scale Saw Carher Spans 32-in Far 35-40 passer$ 400 Ne 726 ElosIds SotellOc 450 FE Electric cenvession Can bout far 6-cell Class 07-cell Class Spans 56 r-n Fan Astroflife 035 Cobalt motor$ 725 No 72OTl6erCat PC Eiectnc73-n-span evolofian nI TigerKitten LococoingsportlaerobalictorCobaitwmotorand 261200 MASceils Dylansheets0 1400 No720 Seopper CL Profile stonIer boned ciannin 1504/cA Snapper 46/s-inspan roidoolog 25-35 power5 550 No731 Feothar Merehont FE Old-Tinner FE am PC Assist 72 spani25 passer Easy folly eaceptianaily wnde stall tolerance 2 plan sheets$ 1075 F Circle numbers plans wish order best hsndling please include requeSts payment tor some other service piano order No phone orderg call 703 435-0750 order assisfasce ONLYI II II II II II II II I_I II III Make check money order payable US funds drawn US bank ModelAviation AMA 1810 I Samuel Morse Dr Reston vA 22090 Please allow 3 6 weeks deliveryI Please print carefullyEnclosed $ _________________________________ NAMEAMA No STREETI II CITYI II STATEZIPI L.1 193262310314326332386447539578 588598603646650654661667674675 o 676677678679681684686688689692 O696697699700701702703705706707 708709710711712713714715716717 718719720721722723724725726727 728729730731732 92 Plan price includes first class postage US delivery Air Mail Over 300 miles orders non-US addresses please add $250 Air Mail postage handling plan 182 Model Aviation ncrease rubber weight shifts CC aft Again little concern model could important others Finally longer motor compared started will need braiding avoid CG shift between wound unwound big problem ignored either Questions welcome inued Letters Editor Continued page 167 water want predict failure will manifest itself What pressure will home builder actually maintain can violent rupture also very possible Such accident may never happen article AMA MA has become liable am guilty author wanting put seemingly useful throwaways use have air conditioning contractor life now work Lennox Industries Inc major manufacturer air conditioning equipment time used produce portable air tanks filling flat tires until recognized liability reusing cans began removing tank valves puncturing safety patch scroungers could use cans unsafe pressure applications second concern obvious open-belt drive Inexpensive covers available could made should have part article Enough obvious error Daniel D Kautz Piano Texas Possible am 15 years old have flying model airplanes about three years now After reading Letters Editor numerous times different issues MA decided send thoughts let other people see person age thinks about model aviation Anyway idea take tail section V tail attach wingtips normal plane would no need tail section control surfaces would V wing Up would normal V tail except both Vs would up position down would same Along needing tail section would no need ailerons roll simply make V go up other down banking climb raise V other Well thoughts 15-yearold very anxious see whether type design will work Derek Walton Port Neches Texas PS imagined plane have tricyclestyle landing gear pusher 9 03 0 -3ChJ 93 C C53 9 0 90 - w g-3 00 ccn 2 9s 530 C9 0 V 0 93 C 3 9 o 9d2 -53 9 53C 0 no. 00 039 C53 53 5393 90 - 0 930 -9 9 0 92115 0ChJ adO 6053 0 Co CUC 9 0 0 NE i 5 LLfl