Letters Editor As power engineer 25-plus years heavy industrial experience read alarm article Junkbox Air Compressor November 1992 issue Model Aviation believe someone could severely injured possible resultant liability claims should compressed air unit built manner Although engine can easily converted function compressor materials recommended suitable temperatures pressures involved 50 psi discharge temperature will about 3000F 100 psi about SOOT Specific comments Use plastics will soften near compressor discharge Use PCV valves designed pressure Use soft solder discharge joints melts about 4500F Use water heater relief valve designed compressed air use Most temperature reliefsnot pressure reliefs Use Freon tank designed re-use alr receiver Most specifically state Re-Use tank Use rubber stopper engine conversion will eventually deteriorate because high temperature Lack receiver drain valve condensation removal Users should also made aware possibility internal explosion homemade compressor hot spots inside ignite lubricating oiL/hot air mixture safetys sake would highly recommend purchase small properly designed compressed air system Cost should $150 lessa small price pay prevent loss eye fire ones home Robert J Moffat Viscount Canada .And Heres article Model Aviation November 92 titled Junkbox Air Compressor Joel Hamm creative informative AMA member concerned safety air conditioning refrigeration technician must protest suggested use empty Freon tank air accumulator tanks protected internally against rust corrosion Refrigerant moisture-free product large percentage air water therefore tanks have tendency rust unnoticeably inside out providing potentially dangerous situation used air tank actual warning label tank reads follows refill use purpose Federal law forbids transportation refilledpenalty up $25000 fine five years imprisonment 49USC 1809 store wet corrosive environment After use vent remaining pressure leave valve open dispose empty container properly Never use air tank would think wiser move would go local auto parts store hardware store flea market purchase DOT-approved portable air tank new sells $20 $30 used about $10 small price pay safety Richard F Canup Cocoa Florida Taking Exception am writing about deBolts article Primer Aerodynamics September issue cant help respect deBolt modeler also cant avoid saying explanation wing produces lift completely erroneous sketch lower-left corner page 28 shows molecules air flow over wing both airfoil produces lift symmetrical does As molecules pass over wing sketch shows coming closer together both airstream direction perpendicular top surface bottom implies increase air density molecules per cubic inch say speeds models fly just plain wrong molecules indeed come closer together direction perpendicular air flow go farther apart flow direction amount almost exactly keeps air density constant increased molecule spacing flow Continued page 63 APC PROPELLERS Sound Supression Design High Thrust Efficiency Long Fiber Advanced Composite Material Proven Performance US Masters US Nationals Canadian Nationals World Championships SPORTS SIZES 57x36x27x345678910$159 8x4 567 8910$179 9x45678910$199 95x 45 lii x 345678910$229 11x3456789$249 ll5x412x678$289 13x6$425 REVERSE PITCH PUSHER 9x6 lflxS 7 8 11 x67$395 COMPETITION 63 x4 65 x 37 76 x 46 7 9 x 65 85 95 x 65N iN 75N 8N 85N 1D5x 45$395 lix 10 11 12 12W 13 14 12x9 9W 1010W 11 uN 11512 12N 125 13 13N 14 125x9 101111512 125 13 13 x 910$795 135x9 1012513314 14x6 8101213 135 14 144x 1051213 145x 14N 15 x 8 10111216x81012$1295 MULTIBLADE onent Propeller Systems 2-bladelSx 8 1012$2200 20x8 10 12 14$2500 22x8 10 12 14 16$3100 24x10 12 14 16$3800 3-Blade17x 10 lBx 10 19x 11$3300 20x10 12 14 21 x12$3700 22x10 12 14 16$4600 24x10 12 14 16$5500 Multi Blade Hubs2-Blade 18-19 dia$3000 2-Blade 20-21 dia$3500 2-Blade 22 dia$4000 2-Blade 24 dia$6000 3-Blade 17-19 dia$4500 3-Blade 20-21 dia$5500 3-Blade 22 dia$6500 3-Blade 24 dia$9000 Contact local hobby dealer first doesnt have what need order direct 816-661-6515 Manutactumd Landing PodsCtS PO Box 938 KnIghts Landing CA 98645 January1993 5 Lets Practice Safety. Letters Editor Continued page 5 direction consistent increased flow velocity according Bernoullis law creates decrease pressure decrease greater over upper surface lower net result lift Also sketches show flow molecules separating surfaces separation does indeed [occur] large aircraft near stall small models some degree under almost flight conditions manner shown sketch separation plays no part production lift fact lift would greater no separation As gospel air considered stationary flight created craft moving through ifflight equally well created air moving aircraft fixed wind-tunnels work gliders can slope-soar Later deBolt makes distinction between gas fluid Equating fluid liquid common error Both gases liquids fluid look up Websters common error perhaps therefore excusable goes say loosely knit nature air opposed liquid characteristic makes flight possible Wrong speeds well below speed sound aerodynamic theory based assumption air incompressible theory experiment agree quite well same theory works water other fluid Hydrofoil boats have wings fly water Properly weighted model gliders fly very nicely under water Later says Lift drag increase square increases speed implies speed increases 10% lift increases 10% 10% 1% fact increases 21% correctly lift drag increase square speed rather are increases speed toughest part about explaining lift explaining Bernoullis law states pressure reduced velocity increased seems contrary nature Bob Meuser Oakland California Paper Planes Young People applaud efforts Hampton Virginia group described August 1992 issue World Record Paper Airplane can proud achievement hope serves example other groups around country Paper airplanes seem hold natural attraction youngsters AIAA St Louis Scietice Center have cosponsored paper airplane contests St Louis recent Continued page 115 Tigercat/Benjamin Continued page 61 solid nonstick base lamination process will assured glue wood edging securely wax rubbing spare candle Working wood strip time wet piece lightly draw around template youve chosen wood carefully should easy Use plastic sheet waxed paper under form prevent its sticking board Secure strips temporarily inserting heavy pins along outer edge template inner strip pinned place applied generous bead Hot Stuff UFO Thick inside strip moving pins outer edge worked way around template kept strip tension working place first strip doesnt come out satisfaction consider practice exercise another Its really difficult results worth effort Give finished laminate shot Kick-It accelerator allow set few moments remove template slight springback wont problem part assembled Continued page 68 A Push-Rod Selection Leaves Up InTheAir Its true offer complete line push-rods world thats important reason choose Sullivan push-rods fact once its model doesnt matter other push-rods carry just want yours work best its will Sullivan push-rods designed built maximum strength flexibility dependability Theyre also light weiit well simply best uy Which means get widest choice Sullivan PRODUC push-rods get best choice P0 BCx5166 Baltimore MD 21224 Getting Better Ideas Off Ground January1993 63 RC Flying Today/Myers Continued page 66 new narrow-band radios doesnt solve RC radio problems Dear George thought new narrow-band radios supposed cure problems So come receiver RC24 went nuts pits whenever two transmitters RC4O RC56 turned same time trans mitters FM receiver AM AM transmitter off time /s/W K Weinrich AMA 158422 Miami Springs FL Heres figure answer problem Take RC channel numbers question Subtract RC40 RC56 what get Sixteen channels Subtract RC24 RC4O what get Sixteen channels Thats written invitation old friend 31M third-order intermodulation pay us visit Three transmitters separated equal numbers channels always invite 31M doesnt matter whether spacing 2 channels 20 problem same An intermodulation signal starts weak falls off rapidly distance Thats AMA Membership Manual recommends flight stations spaced 25 feet apart really need know about situation WK described Question #1 transmitters 25 feet apart Question #2 far transmitters receiver receiver transmitter listen will listen anything else sounds like transmitterin case spurious 31M signal FM transmitters 25 feet apart receiver 50 feet transmitters time some checking Heres good place start letter has summer date WK seem recall gets hot Florida summer Putting black plastic RC transmitter case hot sun can drastically change transmitters characteristics Most electronics technicians like work air-conditioned rooms can assume gold sticker radio went 750F Put thermometer inside black plastic case leave out midday sun knows what temperature will reach wouldnt surprised read 1500F Electronic circuits components dislike kind heat receiver suspect too doesnt like heat either wrapped up foam rubber cocoon stuffed airless room hot exhaust gases washing over wall would feel wrapped foam rubber sleeping bag set out summer sun Im exaggerating little make point Narrow-band equipment does good job treat right cant expect miracle under $200 have help along three people fly together lot should get another channellike RC33 instance hope hints will solve problem ers Editor Continued page 63 years have attracted up 100 entrants year mostly under- 14 age groups received good local media coverage think modeling community missing sure bet getting involved programs nature Along making contribution science education potential recruiting new young modelers other Guinness paper airplane record may interest readers indoor duration record 172 seconds held colleague fellow McDonnell FF club member Ken Blackburn record set indoors seems right down alley indoor HLG fliers Tom McAtee Hazeiwood Missouri Nats Critique Having attended five Nats Los Alamitos Riverside Lincoln Reno Westover can say affair far best organized highest quality ample support sanitation communication individual event direction present offer contestants good level playing field Casual gripes aside staff volunteers endless energy courteous help needed Kudos top bottom splendid job Any no-shows whatever reason should regret word spreads around AMA bashers will have shorter podium after constructive criticism two model people tend go internal time especially under contest stress consequently always best job explaining ourselves public would suggest simple event rules procedures placards posted venue table should large print written laymenlwomenFor example fascinated intense CL combat goingson quite up answering spectator questions about wins after midairs proposed signs could helpful recyclable year year Secondly mini-museum set up near HQ tent food area featuring facets AMA flight/sport activities would nicewith actual models static display comprehensive photo boards callouts Possibly difficult worthwhile fact would recommend expansion Nats onsite PR materials displays stuff available Finally videocassettes prior Nats good quality should available public 15 20 bucks think John Oldenkamp San Diego Cali fornia Ed note photos enjoyed November 1992 Nationals edition Model Aviation taken gifted photographer hardworking AMA member Thanks John giving us photo album event year--the Nationals Chicopee Continued page 170 CL Racing/Ballard Continued page 96 interior surfaces tank shown should give about 30-32 laps 9 x 7 APC prop aircraft can effectively block faster Bill Bischoff originated design has satisfied racers Texas area Golden Age air racing have flood letters requesting information Golden Age racers Enclosed month general aircraft requirements racing rules George McGinnis has sent some spectacular photos aircraft participants recent contest information available George McGinnis Hanson Hobby Inc 830 Main Street PO Box 150 Hanson MA 02341 call 617 293-2804 Rat Race piloting pilot walks smallest circle elapsed race time may reduced 5 15 seconds As races determined tenths second can difference between victory also-ran photo Howard Shahan Larry Dziak Jr shows both pilots leaning center circle positions make little passing especially airspeeds close Most rat races today won lost pits good pilot 5-second slower aircraft can effectively block faster competitor backwalking circle imposing additional pressure pit crew fast stop other area time saving shut down elapsed time three seconds can lost gliding extra unpowered lap slow approaches pitman Remember contest race preparation work saving time teams race performance will improve As always comments photos solicited Write address shown above uary1993 115 RC Flight Training Beginner advanced tailored indMduai long-time modeler full size airplane flight instruc tor will make progress fun easy during week stay beautiful far western North Carolina Write call information RC Fight Training 3 1704 3894968 WILLIAMS ACCESSORIES BROTHERS _______________ 4 PILOTS STANDARD TSMAN VINTAGE TH CONTOUR BALLOON EN AGE - 4 ENGINES PRATT & WHITNEY HT HONE 3 VICKERS DAU BELLUM LSASE FOR FREE ILLUSTRATED ORDER FORM DEPT MA 151 PAWNEE ST SAN MARCOS CALIFORNIA 92069 170 Model Aviation ers Editor Continued page 115 Wonderful Memories Wonderful Modelers goals upon retiring get back old-time free flight model building started about left off years ago 1939 Zipper powered 1940 Ohlsson 23 ignition engine Hobby Horn kit dream build less 30 oz completed airplane promised real soarer thrilled attended Bong Eagles-Chicago Aeronuts recent free flight contest spectator once again familiarize myself activity took Zipper along afterthought After getting hyped up watching activity went off myself try test flight engine run 15 sec very low power Zipper reached about 150 feet altitudewhich stayed very slowly lazily soared south circling like hawk After chasing foot mile came shore lake airplane continued across water out sight over woods meadow beyond successful flight cost Zipper few days later received phone call Mr Jack Boone Mukwonago Wisconsin member Bong Eagles Jack witnessed flight evening flew over area own Cessna 172 until spotted Zipper near cornfield next day drove 25 miles back scene recovered model before calling other activity world could build such consideration perfect stranger story doesnt end As left chase Zipper car wide open flight box small paper carton containing few essentials tailgate cleaned out box few days later found business card bottom Mr Leo J Dringoli Northfield Illinois back card penciled note read hope didnt lose beautiful Zipper fly out Kenosha Airport will help look air have always felt some attributes make model builders unique people Perhaps natural skill patience dedication survivability adaptability determinationall combine create modeling enthusiast As reflect over events past few days well other wonderful contacts Ive made through modeling sense fraternal bond exists among enjoy hobby kind bond brings Boones Dringolis extend themselves others perfect strangers did wouldnt us just unselfishly share equipment offer assist run aid Continued page 176 tIRK UflU ________ LFL2GRT 2~S1I1/9 iimrr -6 lb 1116 Wooo Iast 97UE LO. O0s . Th 37Wom 939 b tj boo~ 615 6221171FUR 2030 bIE be] 04 pb Typical 45 Will Turn 13-6 Over 10000 Get 3 Mm Oz & Idle Well Below 2000 UNLEASH POWER WITHIN DIESELIZE its AWESOME Bigger Engine Won t Fit MORE POWER BIGGER PROPS COOL RUNNING LESS NOISE NO GLOWPLUGS LOW IDLE Largest Producer Model Diesel Fuels Call 203 877-1670 send 75 stamped #10 SASE & $200 Davis Diesel Development PO Box 141 ord CT 06460 World Leader Model Diesel Technology Since 1975 S T & WHITNEY HONE WRIGHT E 2TTNSJ II 730 Snapper$650 CL Based classic 1954 1/2A Snapper 48/2-in-span midwing profile stunter designed around Fox 35 will handle almost 25-35 engine No 193 StIletto CL Stool 00401 McDonald winnen 1970 1980 1982 PAl World Champs$ 375 No262 Crenheeeter CL oraah-prOOl trainer Two sizesi 5/30 35/40 power$ 120 No3101930 Fleet Biplane SC Spod Scale tot 35/40 power 4-chonnel Spana 55 1/5 scala 2 plan aheels$ 625 Ne3IdOroke II RCKnnWillardstlping boatfor3chennel 15 power Flytroon landwrth renrenablegear$ 375 No326 Teplar Cab SC Don SodI Schoalpard Scale 101049 power 23 ohannal Spana SOlo$ 350 No332 Zephyr RC smell 2-channal Glider tar hand-looncln tow therrrral alope soaring6 200 Na 366 Loner 260 SC Spod Scale raplina chanrpionnhip Aarohatic liar FordS power4-5 channel an streets0 1075 aJNe 447 tl2A Mine Anrerlee SC Old Timer 1/28 Teoaco erodel br 049 glow 2 channels$ 650 03Ne 536 SlotIto Slew-Me9ee 15 SC Tailless Ilping wing br 15 power Spans 60 3 channel$ 350 Ne 976 Sehoteleer l-26B RC Goarlerncnle Sailplane Spans 125 2 plan sheats$1475 Ne 561 Gee Bee Mattel Vs SC Golden Age Racer Spans 72-in 1/S scele tar 60 power 3 plan shears$1170 0 C Ne 566 Merteb SC Slopo-Soa/ng Sailplane Spans 4110. 260 channels6 42S 0Ne 596 Coreaat ISO SCAsoint StdTirner enlarged ISO% Spans 72 45- 4-stroke/SO- 2stroke6 85/3 C\iNe 603 Sparronot Hawk P30 FF Cowpetition robber-power plane won 1987 Nets Spans 36 in5 225 e 646 WInter Newk FF gobSetpower Cooped Hicar competition plane Spans 47 in375 II 5 tOe 656 47106 BC Speelel SC Aerohatic apod plane 40 power Spans kiln 3 plan sheets$1070 Ne 6gdToereeol SCTrainer/Spodnterstyladaherthe FlO Spans 66 40161 power 4 plan sheets61525 Ne 661 Eerhep-Oerotie FE Ewh5/o hodarance robber power plane Spans 205 in5 200 oNw 667 AT-fl CL Sewiscale protile Stanter tsr 35140 power Spans 47156 575 Ne 673 Kreekejoo SC apdeted cewion 01 pioneer spod plane Spans 74 2 plan sheets$1375 Ne 674 Kneerpler SC 075-powened hieclric semi-scala bi-winger Spans 38 inS S7S o No 675 BDF-t FE Osin-tailed spod tImer 00002 Pee Wee engine Spans 25 in0 225 No 676 HItler SC hain-eleGec high-wing Spoc ship designed tar Hiline lwp 30 0nlor Has tricycle gear spans dOin5 400 Na 677 Theederhint CL Stonter ton 20-35 power Two plan sheets drewn lro0 originnl 1862 Veco kit Spans 54 in 0 975 Ne 676 Been Bee FF West Coast Sastonian Oatdoor design Opens iSin156 Ne 679 Big Binget Lange SC SpoWler spans g 120-24 power 2 plan sheets$1700 E wNe 681 1669 Baste BD4 FE Soober Scale model spens 150 ing 325 O66664 Stoogarolsg Beech 3-Channel SC Ochoolperd-Scale hi-wing Spocater Fot 049 power Spans 32 in6 375 Na 666 Feller SC Panern-typo spoO plane 2-or 4-opole power Spans 65 in$ 725 No666 SteeBh GlItter FE robberhand-laoeched toanobalsa Canard CatepalhSteahh Glider combo Spons 95 ing 200 NNe 669 Ttsoeson Meene Oossd SOC SC 1/5 scale hiplane tar 90 power Spans a3 3 plan sheets$1975 6 No6923 Meter Seootar SC high pedarntance Sailplane Spans 118 in2 plan sheets$1100 66 Pete Cot FF P30 Class AMA Senior reaard holder Spans 31 in$ 225 gNo667 Tlgarkftten F SC high pedarnranco Spad Aerahatia design 00/15 Cahalt elealtic power SpansShin$ igoS 03CJNo666 Top Cot 90L-1 FE Sosber FAI Indoan Stick Gliderholds AMA Cat FiD Stick National Records Spans 13125 2 plan sheets$ 3Sg 766 Bondyn Dinne SC economical cersatila SpooTrainer Ideal br 15 power Weighs 33-na Spans 56 in$ 075 2 No701 Jeespln Gee SC high pedarmnance Spodster designed tot ton lip enents Weighs 0-lb spans 40 40-40 powerS 725 No 703 Helekel NE 16 FE Scala model 011924 German nrnnaplana HiLine Mini-k geered olectria motor Spans2O in$ 200 Na 703 Otoadhopper SC Grant Scale Spodstem reminiscent 18300 Heath harneSailt Spans 00 Par 00 power 2 plan sheets$1456 No709 Zeettls FE Hand-toonch Glider tar cerloos aamnpet6ian Wing DT Spans IS in. 35-00 grews5 200 0No766 0-Gone SC law aing 45-50-powered Sped Aembatic design reminiscent 0118304 Kincer Span span plane Spans 570 in$ 500 N -No767 52P Tracker CL Scale twrn-009-pasaered model Gromannan design Spans 39 in$ 325 No 766 PGM TInier FE rotrber-poweredttainer ideal tar intradoatian SOD flying Opens 1km$ 100 No766 AIr Coder SC FE ton tiler/trainer tar 020 power Stick-aed-tissae model recelleats Cessna Bird Dng Spans 36 in$ 480 E 0 Qalekle 366 SC Pylon recer end Spad tIler tar intermediate boildar//tller Can raced CL 6026 power Foam wing spans 40 . $ 550 qNo711 Fekker 6-It Tppa FE SOG SoSher-powered Oatdcet Stick model Senseniscont 85/OIl Gemman tighter Spans 230 in$ 205 No712 Vetetet Besllgo L-OOTP SC Sped Scale cersico Finnish Vinke nmilitorp trainer Far Goadma am Zenaah power spans Shin 2 plan sheets . $1000 13MIg29 FE CatapoltGlider PonernedaSerSaasiandenmanstratartlawn atCleaoland Ohio 1991 Spans l3mn$ 220 c60714 Mad Desk SC oser-triendly SpoO Ilier tar meloced slow Ilight hecells law slow Iraneosors Fnr 25-36 power Spans 60 2 plan sheetsg 9og No715 Stephene ACre SC Goanor scale aeratratic plane spans 720 ases 75190 power 2 plan sheets$ 1375 V6No716 Stow Poker FE Secard-setsng lntdcer HLG opens 240 Wood stroctare reintoroed carson n$ 200 No717 SentIence NC Corehet Ptene SC SparlICamnbat tiler tram Sossie tar 30cc engine 3-channels spans 475-in $ 075 710 IBeBIpa SC cemy aemahatia ton lIp bipe design John Hontan Spans 650-in tar 3g.45 power 2 plan sIneets$ 600 - No710 Ante SC Etectdc podarmnanae/spod Glidem Far 96 direat-drice natar P00 channels Spans 69 aedable tap systew 2 plan sheets $ 725 720 MIneteeton FE Prank Zaics papolar all-belsa-cocemed robber-powered model taken tram PapolamOolenca lane 1001 Spans 20 in$ 200 o 6No 721 LII Feller SC mid-wing Ion lip spod plane Folly aemahatic 4-channel central Far 40-51 power Spans 48-in$ 600 5-Ne 722 Locep M-6/s FE Goobled 70-5g-n tronm Bostonian design Far Mini-k rnator 50 mnAH traneries Spans 198n-in0 220 6Ne 723 AnIn 87 CL Designed Poland try P10mm Zawade Ada Poanan Intended ter Shoe Aerabalico Progreem Par 15 powerr Spans 36/a-in6 400 CG No72dThn Seeratwepee SC GiantScale nnid-wingaeratratiashiptakenlronnadginal l947otaetdesign SpansOg-in 2 plansheets$1600 o No700 CardInal 69 CL Stonter alassic 19600 lines snip 4 Stont ships ecer awarded 55 appoeramace points Spans 62/a-in 60 power$ 112S 63No726 Cie-Ak-Dee SC trlecric-powored light-weight Cessna oak-alike ton Ilyar designed tar 000 molar k-call pools Spans 02/a-in 2 plen shoots$1125 6 No 727 CerlIne SF7C Seahawk CL Molti-porpase Siwinger Can canspete troth Pratile Scelo hacy Carder Spans 32-in Far 35140 power$ 4gO 730 Eleegrie BelellOn 450 FE trlnctnaaancernian Can holt tar k-cell Class am 7-cell Class B Spans 50/a-in Astmollde 030 Cotrae motor$ 725 Cl3I [v32][b-1-10-1-10]] Circle numbers plans wish order best handling pleaSe include requests 0 Cl Ipayment some other service plans order COn 1932623103143263323864c7 539578588598603646650654 03661667672674675676677678 681684686688689692696 o 2697699700701702703705706 vZO707708709710711712713714 E l3 I715716717718719720721722 0686 o 724725726727728729730 n price includes tirst class postage US delivery Air Mail over 300 miles 0 orders non-US addresses please add $250 Air Mail postage handling plan E Make check money order payable US tunds drawn US bank ModelAviation AMA 1810 66 Samuel Morse Dr Reston VA 220g0 PleaSe allow 3 6 weeks tor delivery Please print carefullyEnclosed $ I_________________________________ 6 NAMEAMANo c I STREET 6 N I CITY ~- STATEZIP n j v32][b-1-10-1-10]] CL AerobaticslMcMillan Continued page 91 dark paint silver ink plane reminded tip Glen Meador Lou Dudka inking metallic inks best type use found disposable pens art stores Simply drill small hole end container away tip fill Rapidograph ink water based early silver gold inks corrosive make mistake can cleaned Prepsol-type degreasers still fresh Best yet draws super line flows just like good drafting india ink Also subject inking usually erase problems isopropyl alcohol youre quick can done cleanly works well last cauldron however found acrylic lacquer color alcohol worked fine ink also started work paint So careful soft touch moistened tissue rather saturated best approach Youre Talking Continued page 114 should investigate other forms RC combat popular different parts country find out contests run what type aircraft used After dont totally agree some types RC combat Ive read about group safety conscious using common sense Im going lobby get type combat banned After Mr Stetter still feels inclined against RC combat will staunchly support right object Dan Snow Maynard Massachusetts FF MO-llLinstrum Continued page 99 point necessary weighting nose clay Downthrust right thrust may required Once trimming has done can increase motor length turns Happy htiidiiigsr carrier ace ers Editor Continued page 170 others distress share pain loss crash What wonderful brotherhood share through modeling Leroy J Konrath Fox Point Wisconsin 176 Model Aviation -SIZE PLANS 729 Ti gercat$1400 RC lectric 73-in-span evolution TigerKitten low-wing sporflaerobatic ship can handle up Cobalt 60 motor 28 1200 mAh cells serious aerobatic performance 2 plan sheets
Edition: Model Aviation - 1993/01
Page Numbers: 5, 63, 115, 170, 176
Letters Editor As power engineer 25-plus years heavy industrial experience read alarm article Junkbox Air Compressor November 1992 issue Model Aviation believe someone could severely injured possible resultant liability claims should compressed air unit built manner Although engine can easily converted function compressor materials recommended suitable temperatures pressures involved 50 psi discharge temperature will about 3000F 100 psi about SOOT Specific comments Use plastics will soften near compressor discharge Use PCV valves designed pressure Use soft solder discharge joints melts about 4500F Use water heater relief valve designed compressed air use Most temperature reliefsnot pressure reliefs Use Freon tank designed re-use alr receiver Most specifically state Re-Use tank Use rubber stopper engine conversion will eventually deteriorate because high temperature Lack receiver drain valve condensation removal Users should also made aware possibility internal explosion homemade compressor hot spots inside ignite lubricating oiL/hot air mixture safetys sake would highly recommend purchase small properly designed compressed air system Cost should $150 lessa small price pay prevent loss eye fire ones home Robert J Moffat Viscount Canada .And Heres article Model Aviation November 92 titled Junkbox Air Compressor Joel Hamm creative informative AMA member concerned safety air conditioning refrigeration technician must protest suggested use empty Freon tank air accumulator tanks protected internally against rust corrosion Refrigerant moisture-free product large percentage air water therefore tanks have tendency rust unnoticeably inside out providing potentially dangerous situation used air tank actual warning label tank reads follows refill use purpose Federal law forbids transportation refilledpenalty up $25000 fine five years imprisonment 49USC 1809 store wet corrosive environment After use vent remaining pressure leave valve open dispose empty container properly Never use air tank would think wiser move would go local auto parts store hardware store flea market purchase DOT-approved portable air tank new sells $20 $30 used about $10 small price pay safety Richard F Canup Cocoa Florida Taking Exception am writing about deBolts article Primer Aerodynamics September issue cant help respect deBolt modeler also cant avoid saying explanation wing produces lift completely erroneous sketch lower-left corner page 28 shows molecules air flow over wing both airfoil produces lift symmetrical does As molecules pass over wing sketch shows coming closer together both airstream direction perpendicular top surface bottom implies increase air density molecules per cubic inch say speeds models fly just plain wrong molecules indeed come closer together direction perpendicular air flow go farther apart flow direction amount almost exactly keeps air density constant increased molecule spacing flow Continued page 63 APC PROPELLERS Sound Supression Design High Thrust Efficiency Long Fiber Advanced Composite Material Proven Performance US Masters US Nationals Canadian Nationals World Championships SPORTS SIZES 57x36x27x345678910$159 8x4 567 8910$179 9x45678910$199 95x 45 lii x 345678910$229 11x3456789$249 ll5x412x678$289 13x6$425 REVERSE PITCH PUSHER 9x6 lflxS 7 8 11 x67$395 COMPETITION 63 x4 65 x 37 76 x 46 7 9 x 65 85 95 x 65N iN 75N 8N 85N 1D5x 45$395 lix 10 11 12 12W 13 14 12x9 9W 1010W 11 uN 11512 12N 125 13 13N 14 125x9 101111512 125 13 13 x 910$795 135x9 1012513314 14x6 8101213 135 14 144x 1051213 145x 14N 15 x 8 10111216x81012$1295 MULTIBLADE onent Propeller Systems 2-bladelSx 8 1012$2200 20x8 10 12 14$2500 22x8 10 12 14 16$3100 24x10 12 14 16$3800 3-Blade17x 10 lBx 10 19x 11$3300 20x10 12 14 21 x12$3700 22x10 12 14 16$4600 24x10 12 14 16$5500 Multi Blade Hubs2-Blade 18-19 dia$3000 2-Blade 20-21 dia$3500 2-Blade 22 dia$4000 2-Blade 24 dia$6000 3-Blade 17-19 dia$4500 3-Blade 20-21 dia$5500 3-Blade 22 dia$6500 3-Blade 24 dia$9000 Contact local hobby dealer first doesnt have what need order direct 816-661-6515 Manutactumd Landing PodsCtS PO Box 938 KnIghts Landing CA 98645 January1993 5 Lets Practice Safety. Letters Editor Continued page 5 direction consistent increased flow velocity according Bernoullis law creates decrease pressure decrease greater over upper surface lower net result lift Also sketches show flow molecules separating surfaces separation does indeed [occur] large aircraft near stall small models some degree under almost flight conditions manner shown sketch separation plays no part production lift fact lift would greater no separation As gospel air considered stationary flight created craft moving through ifflight equally well created air moving aircraft fixed wind-tunnels work gliders can slope-soar Later deBolt makes distinction between gas fluid Equating fluid liquid common error Both gases liquids fluid look up Websters common error perhaps therefore excusable goes say loosely knit nature air opposed liquid characteristic makes flight possible Wrong speeds well below speed sound aerodynamic theory based assumption air incompressible theory experiment agree quite well same theory works water other fluid Hydrofoil boats have wings fly water Properly weighted model gliders fly very nicely under water Later says Lift drag increase square increases speed implies speed increases 10% lift increases 10% 10% 1% fact increases 21% correctly lift drag increase square speed rather are increases speed toughest part about explaining lift explaining Bernoullis law states pressure reduced velocity increased seems contrary nature Bob Meuser Oakland California Paper Planes Young People applaud efforts Hampton Virginia group described August 1992 issue World Record Paper Airplane can proud achievement hope serves example other groups around country Paper airplanes seem hold natural attraction youngsters AIAA St Louis Scietice Center have cosponsored paper airplane contests St Louis recent Continued page 115 Tigercat/Benjamin Continued page 61 solid nonstick base lamination process will assured glue wood edging securely wax rubbing spare candle Working wood strip time wet piece lightly draw around template youve chosen wood carefully should easy Use plastic sheet waxed paper under form prevent its sticking board Secure strips temporarily inserting heavy pins along outer edge template inner strip pinned place applied generous bead Hot Stuff UFO Thick inside strip moving pins outer edge worked way around template kept strip tension working place first strip doesnt come out satisfaction consider practice exercise another Its really difficult results worth effort Give finished laminate shot Kick-It accelerator allow set few moments remove template slight springback wont problem part assembled Continued page 68 A Push-Rod Selection Leaves Up InTheAir Its true offer complete line push-rods world thats important reason choose Sullivan push-rods fact once its model doesnt matter other push-rods carry just want yours work best its will Sullivan push-rods designed built maximum strength flexibility dependability Theyre also light weiit well simply best uy Which means get widest choice Sullivan PRODUC push-rods get best choice P0 BCx5166 Baltimore MD 21224 Getting Better Ideas Off Ground January1993 63 RC Flying Today/Myers Continued page 66 new narrow-band radios doesnt solve RC radio problems Dear George thought new narrow-band radios supposed cure problems So come receiver RC24 went nuts pits whenever two transmitters RC4O RC56 turned same time trans mitters FM receiver AM AM transmitter off time /s/W K Weinrich AMA 158422 Miami Springs FL Heres figure answer problem Take RC channel numbers question Subtract RC40 RC56 what get Sixteen channels Subtract RC24 RC4O what get Sixteen channels Thats written invitation old friend 31M third-order intermodulation pay us visit Three transmitters separated equal numbers channels always invite 31M doesnt matter whether spacing 2 channels 20 problem same An intermodulation signal starts weak falls off rapidly distance Thats AMA Membership Manual recommends flight stations spaced 25 feet apart really need know about situation WK described Question #1 transmitters 25 feet apart Question #2 far transmitters receiver receiver transmitter listen will listen anything else sounds like transmitterin case spurious 31M signal FM transmitters 25 feet apart receiver 50 feet transmitters time some checking Heres good place start letter has summer date WK seem recall gets hot Florida summer Putting black plastic RC transmitter case hot sun can drastically change transmitters characteristics Most electronics technicians like work air-conditioned rooms can assume gold sticker radio went 750F Put thermometer inside black plastic case leave out midday sun knows what temperature will reach wouldnt surprised read 1500F Electronic circuits components dislike kind heat receiver suspect too doesnt like heat either wrapped up foam rubber cocoon stuffed airless room hot exhaust gases washing over wall would feel wrapped foam rubber sleeping bag set out summer sun Im exaggerating little make point Narrow-band equipment does good job treat right cant expect miracle under $200 have help along three people fly together lot should get another channellike RC33 instance hope hints will solve problem ers Editor Continued page 63 years have attracted up 100 entrants year mostly under- 14 age groups received good local media coverage think modeling community missing sure bet getting involved programs nature Along making contribution science education potential recruiting new young modelers other Guinness paper airplane record may interest readers indoor duration record 172 seconds held colleague fellow McDonnell FF club member Ken Blackburn record set indoors seems right down alley indoor HLG fliers Tom McAtee Hazeiwood Missouri Nats Critique Having attended five Nats Los Alamitos Riverside Lincoln Reno Westover can say affair far best organized highest quality ample support sanitation communication individual event direction present offer contestants good level playing field Casual gripes aside staff volunteers endless energy courteous help needed Kudos top bottom splendid job Any no-shows whatever reason should regret word spreads around AMA bashers will have shorter podium after constructive criticism two model people tend go internal time especially under contest stress consequently always best job explaining ourselves public would suggest simple event rules procedures placards posted venue table should large print written laymenlwomenFor example fascinated intense CL combat goingson quite up answering spectator questions about wins after midairs proposed signs could helpful recyclable year year Secondly mini-museum set up near HQ tent food area featuring facets AMA flight/sport activities would nicewith actual models static display comprehensive photo boards callouts Possibly difficult worthwhile fact would recommend expansion Nats onsite PR materials displays stuff available Finally videocassettes prior Nats good quality should available public 15 20 bucks think John Oldenkamp San Diego Cali fornia Ed note photos enjoyed November 1992 Nationals edition Model Aviation taken gifted photographer hardworking AMA member Thanks John giving us photo album event year--the Nationals Chicopee Continued page 170 CL Racing/Ballard Continued page 96 interior surfaces tank shown should give about 30-32 laps 9 x 7 APC prop aircraft can effectively block faster Bill Bischoff originated design has satisfied racers Texas area Golden Age air racing have flood letters requesting information Golden Age racers Enclosed month general aircraft requirements racing rules George McGinnis has sent some spectacular photos aircraft participants recent contest information available George McGinnis Hanson Hobby Inc 830 Main Street PO Box 150 Hanson MA 02341 call 617 293-2804 Rat Race piloting pilot walks smallest circle elapsed race time may reduced 5 15 seconds As races determined tenths second can difference between victory also-ran photo Howard Shahan Larry Dziak Jr shows both pilots leaning center circle positions make little passing especially airspeeds close Most rat races today won lost pits good pilot 5-second slower aircraft can effectively block faster competitor backwalking circle imposing additional pressure pit crew fast stop other area time saving shut down elapsed time three seconds can lost gliding extra unpowered lap slow approaches pitman Remember contest race preparation work saving time teams race performance will improve As always comments photos solicited Write address shown above uary1993 115 RC Flight Training Beginner advanced tailored indMduai long-time modeler full size airplane flight instruc tor will make progress fun easy during week stay beautiful far western North Carolina Write call information RC Fight Training 3 1704 3894968 WILLIAMS ACCESSORIES BROTHERS _______________ 4 PILOTS STANDARD TSMAN VINTAGE TH CONTOUR BALLOON EN AGE - 4 ENGINES PRATT & WHITNEY HT HONE 3 VICKERS DAU BELLUM LSASE FOR FREE ILLUSTRATED ORDER FORM DEPT MA 151 PAWNEE ST SAN MARCOS CALIFORNIA 92069 170 Model Aviation ers Editor Continued page 115 Wonderful Memories Wonderful Modelers goals upon retiring get back old-time free flight model building started about left off years ago 1939 Zipper powered 1940 Ohlsson 23 ignition engine Hobby Horn kit dream build less 30 oz completed airplane promised real soarer thrilled attended Bong Eagles-Chicago Aeronuts recent free flight contest spectator once again familiarize myself activity took Zipper along afterthought After getting hyped up watching activity went off myself try test flight engine run 15 sec very low power Zipper reached about 150 feet altitudewhich stayed very slowly lazily soared south circling like hawk After chasing foot mile came shore lake airplane continued across water out sight over woods meadow beyond successful flight cost Zipper few days later received phone call Mr Jack Boone Mukwonago Wisconsin member Bong Eagles Jack witnessed flight evening flew over area own Cessna 172 until spotted Zipper near cornfield next day drove 25 miles back scene recovered model before calling other activity world could build such consideration perfect stranger story doesnt end As left chase Zipper car wide open flight box small paper carton containing few essentials tailgate cleaned out box few days later found business card bottom Mr Leo J Dringoli Northfield Illinois back card penciled note read hope didnt lose beautiful Zipper fly out Kenosha Airport will help look air have always felt some attributes make model builders unique people Perhaps natural skill patience dedication survivability adaptability determinationall combine create modeling enthusiast As reflect over events past few days well other wonderful contacts Ive made through modeling sense fraternal bond exists among enjoy hobby kind bond brings Boones Dringolis extend themselves others perfect strangers did wouldnt us just unselfishly share equipment offer assist run aid Continued page 176 tIRK UflU ________ LFL2GRT 2~S1I1/9 iimrr -6 lb 1116 Wooo Iast 97UE LO. O0s . Th 37Wom 939 b tj boo~ 615 6221171FUR 2030 bIE be] 04 pb Typical 45 Will Turn 13-6 Over 10000 Get 3 Mm Oz & Idle Well Below 2000 UNLEASH POWER WITHIN DIESELIZE its AWESOME Bigger Engine Won t Fit MORE POWER BIGGER PROPS COOL RUNNING LESS NOISE NO GLOWPLUGS LOW IDLE Largest Producer Model Diesel Fuels Call 203 877-1670 send 75 stamped #10 SASE & $200 Davis Diesel Development PO Box 141 ord CT 06460 World Leader Model Diesel Technology Since 1975 S T & WHITNEY HONE WRIGHT E 2TTNSJ II 730 Snapper$650 CL Based classic 1954 1/2A Snapper 48/2-in-span midwing profile stunter designed around Fox 35 will handle almost 25-35 engine No 193 StIletto CL Stool 00401 McDonald winnen 1970 1980 1982 PAl World Champs$ 375 No262 Crenheeeter CL oraah-prOOl trainer Two sizesi 5/30 35/40 power$ 120 No3101930 Fleet Biplane SC Spod Scale tot 35/40 power 4-chonnel Spana 55 1/5 scala 2 plan aheels$ 625 Ne3IdOroke II RCKnnWillardstlping boatfor3chennel 15 power Flytroon landwrth renrenablegear$ 375 No326 Teplar Cab SC Don SodI Schoalpard Scale 101049 power 23 ohannal Spana SOlo$ 350 No332 Zephyr RC smell 2-channal Glider tar hand-looncln tow therrrral alope soaring6 200 Na 366 Loner 260 SC Spod Scale raplina chanrpionnhip Aarohatic liar FordS power4-5 channel an streets0 1075 aJNe 447 tl2A Mine Anrerlee SC Old Timer 1/28 Teoaco erodel br 049 glow 2 channels$ 650 03Ne 536 SlotIto Slew-Me9ee 15 SC Tailless Ilping wing br 15 power Spans 60 3 channel$ 350 Ne 976 Sehoteleer l-26B RC Goarlerncnle Sailplane Spans 125 2 plan sheats$1475 Ne 561 Gee Bee Mattel Vs SC Golden Age Racer Spans 72-in 1/S scele tar 60 power 3 plan shears$1170 0 C Ne 566 Merteb SC Slopo-Soa/ng Sailplane Spans 4110. 260 channels6 42S 0Ne 596 Coreaat ISO SCAsoint StdTirner enlarged ISO% Spans 72 45- 4-stroke/SO- 2stroke6 85/3 C\iNe 603 Sparronot Hawk P30 FF Cowpetition robber-power plane won 1987 Nets Spans 36 in5 225 e 646 WInter Newk FF gobSetpower Cooped Hicar competition plane Spans 47 in375 II 5 tOe 656 47106 BC Speelel SC Aerohatic apod plane 40 power Spans kiln 3 plan sheets$1070 Ne 6gdToereeol SCTrainer/Spodnterstyladaherthe FlO Spans 66 40161 power 4 plan sheets61525 Ne 661 Eerhep-Oerotie FE Ewh5/o hodarance robber power plane Spans 205 in5 200 oNw 667 AT-fl CL Sewiscale protile Stanter tsr 35140 power Spans 47156 575 Ne 673 Kreekejoo SC apdeted cewion 01 pioneer spod plane Spans 74 2 plan sheets$1375 Ne 674 Kneerpler SC 075-powened hieclric semi-scala bi-winger Spans 38 inS S7S o No 675 BDF-t FE Osin-tailed spod tImer 00002 Pee Wee engine Spans 25 in0 225 No 676 HItler SC hain-eleGec high-wing Spoc ship designed tar Hiline lwp 30 0nlor Has tricycle gear spans dOin5 400 Na 677 Theederhint CL Stonter ton 20-35 power Two plan sheets drewn lro0 originnl 1862 Veco kit Spans 54 in 0 975 Ne 676 Been Bee FF West Coast Sastonian Oatdoor design Opens iSin156 Ne 679 Big Binget Lange SC SpoWler spans g 120-24 power 2 plan sheets$1700 E wNe 681 1669 Baste BD4 FE Soober Scale model spens 150 ing 325 O66664 Stoogarolsg Beech 3-Channel SC Ochoolperd-Scale hi-wing Spocater Fot 049 power Spans 32 in6 375 Na 666 Feller SC Panern-typo spoO plane 2-or 4-opole power Spans 65 in$ 725 No666 SteeBh GlItter FE robberhand-laoeched toanobalsa Canard CatepalhSteahh Glider combo Spons 95 ing 200 NNe 669 Ttsoeson Meene Oossd SOC SC 1/5 scale hiplane tar 90 power Spans a3 3 plan sheets$1975 6 No6923 Meter Seootar SC high pedarntance Sailplane Spans 118 in2 plan sheets$1100 66 Pete Cot FF P30 Class AMA Senior reaard holder Spans 31 in$ 225 gNo667 Tlgarkftten F SC high pedarnranco Spad Aerahatia design 00/15 Cahalt elealtic power SpansShin$ igoS 03CJNo666 Top Cot 90L-1 FE Sosber FAI Indoan Stick Gliderholds AMA Cat FiD Stick National Records Spans 13125 2 plan sheets$ 3Sg 766 Bondyn Dinne SC economical cersatila SpooTrainer Ideal br 15 power Weighs 33-na Spans 56 in$ 075 2 No701 Jeespln Gee SC high pedarmnance Spodster designed tot ton lip enents Weighs 0-lb spans 40 40-40 powerS 725 No 703 Helekel NE 16 FE Scala model 011924 German nrnnaplana HiLine Mini-k geered olectria motor Spans2O in$ 200 Na 703 Otoadhopper SC Grant Scale Spodstem reminiscent 18300 Heath harneSailt Spans 00 Par 00 power 2 plan sheets$1456 No709 Zeettls FE Hand-toonch Glider tar cerloos aamnpet6ian Wing DT Spans IS in. 35-00 grews5 200 0No766 0-Gone SC law aing 45-50-powered Sped Aembatic design reminiscent 0118304 Kincer Span span plane Spans 570 in$ 500 N -No767 52P Tracker CL Scale twrn-009-pasaered model Gromannan design Spans 39 in$ 325 No 766 PGM TInier FE rotrber-poweredttainer ideal tar intradoatian SOD flying Opens 1km$ 100 No766 AIr Coder SC FE ton tiler/trainer tar 020 power Stick-aed-tissae model recelleats Cessna Bird Dng Spans 36 in$ 480 E 0 Qalekle 366 SC Pylon recer end Spad tIler tar intermediate boildar//tller Can raced CL 6026 power Foam wing spans 40 . $ 550 qNo711 Fekker 6-It Tppa FE SOG SoSher-powered Oatdcet Stick model Senseniscont 85/OIl Gemman tighter Spans 230 in$ 205 No712 Vetetet Besllgo L-OOTP SC Sped Scale cersico Finnish Vinke nmilitorp trainer Far Goadma am Zenaah power spans Shin 2 plan sheets . $1000 13MIg29 FE CatapoltGlider PonernedaSerSaasiandenmanstratartlawn atCleaoland Ohio 1991 Spans l3mn$ 220 c60714 Mad Desk SC oser-triendly SpoO Ilier tar meloced slow Ilight hecells law slow Iraneosors Fnr 25-36 power Spans 60 2 plan sheetsg 9og No715 Stephene ACre SC Goanor scale aeratratic plane spans 720 ases 75190 power 2 plan sheets$ 1375 V6No716 Stow Poker FE Secard-setsng lntdcer HLG opens 240 Wood stroctare reintoroed carson n$ 200 No717 SentIence NC Corehet Ptene SC SparlICamnbat tiler tram Sossie tar 30cc engine 3-channels spans 475-in $ 075 710 IBeBIpa SC cemy aemahatia ton lIp bipe design John Hontan Spans 650-in tar 3g.45 power 2 plan sIneets$ 600 - No710 Ante SC Etectdc podarmnanae/spod Glidem Far 96 direat-drice natar P00 channels Spans 69 aedable tap systew 2 plan sheets $ 725 720 MIneteeton FE Prank Zaics papolar all-belsa-cocemed robber-powered model taken tram PapolamOolenca lane 1001 Spans 20 in$ 200 o 6No 721 LII Feller SC mid-wing Ion lip spod plane Folly aemahatic 4-channel central Far 40-51 power Spans 48-in$ 600 5-Ne 722 Locep M-6/s FE Goobled 70-5g-n tronm Bostonian design Far Mini-k rnator 50 mnAH traneries Spans 198n-in0 220 6Ne 723 AnIn 87 CL Designed Poland try P10mm Zawade Ada Poanan Intended ter Shoe Aerabalico Progreem Par 15 powerr Spans 36/a-in6 400 CG No72dThn Seeratwepee SC GiantScale nnid-wingaeratratiashiptakenlronnadginal l947otaetdesign SpansOg-in 2 plansheets$1600 o No700 CardInal 69 CL Stonter alassic 19600 lines snip 4 Stont ships ecer awarded 55 appoeramace points Spans 62/a-in 60 power$ 112S 63No726 Cie-Ak-Dee SC trlecric-powored light-weight Cessna oak-alike ton Ilyar designed tar 000 molar k-call pools Spans 02/a-in 2 plen shoots$1125 6 No 727 CerlIne SF7C Seahawk CL Molti-porpase Siwinger Can canspete troth Pratile Scelo hacy Carder Spans 32-in Far 35140 power$ 4gO 730 Eleegrie BelellOn 450 FE trlnctnaaancernian Can holt tar k-cell Class am 7-cell Class B Spans 50/a-in Astmollde 030 Cotrae motor$ 725 Cl3I [v32][b-1-10-1-10]] Circle numbers plans wish order best handling pleaSe include requests 0 Cl Ipayment some other service plans order COn 1932623103143263323864c7 539578588598603646650654 03661667672674675676677678 681684686688689692696 o 2697699700701702703705706 vZO707708709710711712713714 E l3 I715716717718719720721722 0686 o 724725726727728729730 n price includes tirst class postage US delivery Air Mail over 300 miles 0 orders non-US addresses please add $250 Air Mail postage handling plan E Make check money order payable US tunds drawn US bank ModelAviation AMA 1810 66 Samuel Morse Dr Reston VA 220g0 PleaSe allow 3 6 weeks tor delivery Please print carefullyEnclosed $ I_________________________________ 6 NAMEAMANo c I STREET 6 N I CITY ~- STATEZIP n j v32][b-1-10-1-10]] CL AerobaticslMcMillan Continued page 91 dark paint silver ink plane reminded tip Glen Meador Lou Dudka inking metallic inks best type use found disposable pens art stores Simply drill small hole end container away tip fill Rapidograph ink water based early silver gold inks corrosive make mistake can cleaned Prepsol-type degreasers still fresh Best yet draws super line flows just like good drafting india ink Also subject inking usually erase problems isopropyl alcohol youre quick can done cleanly works well last cauldron however found acrylic lacquer color alcohol worked fine ink also started work paint So careful soft touch moistened tissue rather saturated best approach Youre Talking Continued page 114 should investigate other forms RC combat popular different parts country find out contests run what type aircraft used After dont totally agree some types RC combat Ive read about group safety conscious using common sense Im going lobby get type combat banned After Mr Stetter still feels inclined against RC combat will staunchly support right object Dan Snow Maynard Massachusetts FF MO-llLinstrum Continued page 99 point necessary weighting nose clay Downthrust right thrust may required Once trimming has done can increase motor length turns Happy htiidiiigsr carrier ace ers Editor Continued page 170 others distress share pain loss crash What wonderful brotherhood share through modeling Leroy J Konrath Fox Point Wisconsin 176 Model Aviation -SIZE PLANS 729 Ti gercat$1400 RC lectric 73-in-span evolution TigerKitten low-wing sporflaerobatic ship can handle up Cobalt 60 motor 28 1200 mAh cells serious aerobatic performance 2 plan sheets
Edition: Model Aviation - 1993/01
Page Numbers: 5, 63, 115, 170, 176
Letters Editor As power engineer 25-plus years heavy industrial experience read alarm article Junkbox Air Compressor November 1992 issue Model Aviation believe someone could severely injured possible resultant liability claims should compressed air unit built manner Although engine can easily converted function compressor materials recommended suitable temperatures pressures involved 50 psi discharge temperature will about 3000F 100 psi about SOOT Specific comments Use plastics will soften near compressor discharge Use PCV valves designed pressure Use soft solder discharge joints melts about 4500F Use water heater relief valve designed compressed air use Most temperature reliefsnot pressure reliefs Use Freon tank designed re-use alr receiver Most specifically state Re-Use tank Use rubber stopper engine conversion will eventually deteriorate because high temperature Lack receiver drain valve condensation removal Users should also made aware possibility internal explosion homemade compressor hot spots inside ignite lubricating oiL/hot air mixture safetys sake would highly recommend purchase small properly designed compressed air system Cost should $150 lessa small price pay prevent loss eye fire ones home Robert J Moffat Viscount Canada .And Heres article Model Aviation November 92 titled Junkbox Air Compressor Joel Hamm creative informative AMA member concerned safety air conditioning refrigeration technician must protest suggested use empty Freon tank air accumulator tanks protected internally against rust corrosion Refrigerant moisture-free product large percentage air water therefore tanks have tendency rust unnoticeably inside out providing potentially dangerous situation used air tank actual warning label tank reads follows refill use purpose Federal law forbids transportation refilledpenalty up $25000 fine five years imprisonment 49USC 1809 store wet corrosive environment After use vent remaining pressure leave valve open dispose empty container properly Never use air tank would think wiser move would go local auto parts store hardware store flea market purchase DOT-approved portable air tank new sells $20 $30 used about $10 small price pay safety Richard F Canup Cocoa Florida Taking Exception am writing about deBolts article Primer Aerodynamics September issue cant help respect deBolt modeler also cant avoid saying explanation wing produces lift completely erroneous sketch lower-left corner page 28 shows molecules air flow over wing both airfoil produces lift symmetrical does As molecules pass over wing sketch shows coming closer together both airstream direction perpendicular top surface bottom implies increase air density molecules per cubic inch say speeds models fly just plain wrong molecules indeed come closer together direction perpendicular air flow go farther apart flow direction amount almost exactly keeps air density constant increased molecule spacing flow Continued page 63 APC PROPELLERS Sound Supression Design High Thrust Efficiency Long Fiber Advanced Composite Material Proven Performance US Masters US Nationals Canadian Nationals World Championships SPORTS SIZES 57x36x27x345678910$159 8x4 567 8910$179 9x45678910$199 95x 45 lii x 345678910$229 11x3456789$249 ll5x412x678$289 13x6$425 REVERSE PITCH PUSHER 9x6 lflxS 7 8 11 x67$395 COMPETITION 63 x4 65 x 37 76 x 46 7 9 x 65 85 95 x 65N iN 75N 8N 85N 1D5x 45$395 lix 10 11 12 12W 13 14 12x9 9W 1010W 11 uN 11512 12N 125 13 13N 14 125x9 101111512 125 13 13 x 910$795 135x9 1012513314 14x6 8101213 135 14 144x 1051213 145x 14N 15 x 8 10111216x81012$1295 MULTIBLADE onent Propeller Systems 2-bladelSx 8 1012$2200 20x8 10 12 14$2500 22x8 10 12 14 16$3100 24x10 12 14 16$3800 3-Blade17x 10 lBx 10 19x 11$3300 20x10 12 14 21 x12$3700 22x10 12 14 16$4600 24x10 12 14 16$5500 Multi Blade Hubs2-Blade 18-19 dia$3000 2-Blade 20-21 dia$3500 2-Blade 22 dia$4000 2-Blade 24 dia$6000 3-Blade 17-19 dia$4500 3-Blade 20-21 dia$5500 3-Blade 22 dia$6500 3-Blade 24 dia$9000 Contact local hobby dealer first doesnt have what need order direct 816-661-6515 Manutactumd Landing PodsCtS PO Box 938 KnIghts Landing CA 98645 January1993 5 Lets Practice Safety. Letters Editor Continued page 5 direction consistent increased flow velocity according Bernoullis law creates decrease pressure decrease greater over upper surface lower net result lift Also sketches show flow molecules separating surfaces separation does indeed [occur] large aircraft near stall small models some degree under almost flight conditions manner shown sketch separation plays no part production lift fact lift would greater no separation As gospel air considered stationary flight created craft moving through ifflight equally well created air moving aircraft fixed wind-tunnels work gliders can slope-soar Later deBolt makes distinction between gas fluid Equating fluid liquid common error Both gases liquids fluid look up Websters common error perhaps therefore excusable goes say loosely knit nature air opposed liquid characteristic makes flight possible Wrong speeds well below speed sound aerodynamic theory based assumption air incompressible theory experiment agree quite well same theory works water other fluid Hydrofoil boats have wings fly water Properly weighted model gliders fly very nicely under water Later says Lift drag increase square increases speed implies speed increases 10% lift increases 10% 10% 1% fact increases 21% correctly lift drag increase square speed rather are increases speed toughest part about explaining lift explaining Bernoullis law states pressure reduced velocity increased seems contrary nature Bob Meuser Oakland California Paper Planes Young People applaud efforts Hampton Virginia group described August 1992 issue World Record Paper Airplane can proud achievement hope serves example other groups around country Paper airplanes seem hold natural attraction youngsters AIAA St Louis Scietice Center have cosponsored paper airplane contests St Louis recent Continued page 115 Tigercat/Benjamin Continued page 61 solid nonstick base lamination process will assured glue wood edging securely wax rubbing spare candle Working wood strip time wet piece lightly draw around template youve chosen wood carefully should easy Use plastic sheet waxed paper under form prevent its sticking board Secure strips temporarily inserting heavy pins along outer edge template inner strip pinned place applied generous bead Hot Stuff UFO Thick inside strip moving pins outer edge worked way around template kept strip tension working place first strip doesnt come out satisfaction consider practice exercise another Its really difficult results worth effort Give finished laminate shot Kick-It accelerator allow set few moments remove template slight springback wont problem part assembled Continued page 68 A Push-Rod Selection Leaves Up InTheAir Its true offer complete line push-rods world thats important reason choose Sullivan push-rods fact once its model doesnt matter other push-rods carry just want yours work best its will Sullivan push-rods designed built maximum strength flexibility dependability Theyre also light weiit well simply best uy Which means get widest choice Sullivan PRODUC push-rods get best choice P0 BCx5166 Baltimore MD 21224 Getting Better Ideas Off Ground January1993 63 RC Flying Today/Myers Continued page 66 new narrow-band radios doesnt solve RC radio problems Dear George thought new narrow-band radios supposed cure problems So come receiver RC24 went nuts pits whenever two transmitters RC4O RC56 turned same time trans mitters FM receiver AM AM transmitter off time /s/W K Weinrich AMA 158422 Miami Springs FL Heres figure answer problem Take RC channel numbers question Subtract RC40 RC56 what get Sixteen channels Subtract RC24 RC4O what get Sixteen channels Thats written invitation old friend 31M third-order intermodulation pay us visit Three transmitters separated equal numbers channels always invite 31M doesnt matter whether spacing 2 channels 20 problem same An intermodulation signal starts weak falls off rapidly distance Thats AMA Membership Manual recommends flight stations spaced 25 feet apart really need know about situation WK described Question #1 transmitters 25 feet apart Question #2 far transmitters receiver receiver transmitter listen will listen anything else sounds like transmitterin case spurious 31M signal FM transmitters 25 feet apart receiver 50 feet transmitters time some checking Heres good place start letter has summer date WK seem recall gets hot Florida summer Putting black plastic RC transmitter case hot sun can drastically change transmitters characteristics Most electronics technicians like work air-conditioned rooms can assume gold sticker radio went 750F Put thermometer inside black plastic case leave out midday sun knows what temperature will reach wouldnt surprised read 1500F Electronic circuits components dislike kind heat receiver suspect too doesnt like heat either wrapped up foam rubber cocoon stuffed airless room hot exhaust gases washing over wall would feel wrapped foam rubber sleeping bag set out summer sun Im exaggerating little make point Narrow-band equipment does good job treat right cant expect miracle under $200 have help along three people fly together lot should get another channellike RC33 instance hope hints will solve problem ers Editor Continued page 63 years have attracted up 100 entrants year mostly under- 14 age groups received good local media coverage think modeling community missing sure bet getting involved programs nature Along making contribution science education potential recruiting new young modelers other Guinness paper airplane record may interest readers indoor duration record 172 seconds held colleague fellow McDonnell FF club member Ken Blackburn record set indoors seems right down alley indoor HLG fliers Tom McAtee Hazeiwood Missouri Nats Critique Having attended five Nats Los Alamitos Riverside Lincoln Reno Westover can say affair far best organized highest quality ample support sanitation communication individual event direction present offer contestants good level playing field Casual gripes aside staff volunteers endless energy courteous help needed Kudos top bottom splendid job Any no-shows whatever reason should regret word spreads around AMA bashers will have shorter podium after constructive criticism two model people tend go internal time especially under contest stress consequently always best job explaining ourselves public would suggest simple event rules procedures placards posted venue table should large print written laymenlwomenFor example fascinated intense CL combat goingson quite up answering spectator questions about wins after midairs proposed signs could helpful recyclable year year Secondly mini-museum set up near HQ tent food area featuring facets AMA flight/sport activities would nicewith actual models static display comprehensive photo boards callouts Possibly difficult worthwhile fact would recommend expansion Nats onsite PR materials displays stuff available Finally videocassettes prior Nats good quality should available public 15 20 bucks think John Oldenkamp San Diego Cali fornia Ed note photos enjoyed November 1992 Nationals edition Model Aviation taken gifted photographer hardworking AMA member Thanks John giving us photo album event year--the Nationals Chicopee Continued page 170 CL Racing/Ballard Continued page 96 interior surfaces tank shown should give about 30-32 laps 9 x 7 APC prop aircraft can effectively block faster Bill Bischoff originated design has satisfied racers Texas area Golden Age air racing have flood letters requesting information Golden Age racers Enclosed month general aircraft requirements racing rules George McGinnis has sent some spectacular photos aircraft participants recent contest information available George McGinnis Hanson Hobby Inc 830 Main Street PO Box 150 Hanson MA 02341 call 617 293-2804 Rat Race piloting pilot walks smallest circle elapsed race time may reduced 5 15 seconds As races determined tenths second can difference between victory also-ran photo Howard Shahan Larry Dziak Jr shows both pilots leaning center circle positions make little passing especially airspeeds close Most rat races today won lost pits good pilot 5-second slower aircraft can effectively block faster competitor backwalking circle imposing additional pressure pit crew fast stop other area time saving shut down elapsed time three seconds can lost gliding extra unpowered lap slow approaches pitman Remember contest race preparation work saving time teams race performance will improve As always comments photos solicited Write address shown above uary1993 115 RC Flight Training Beginner advanced tailored indMduai long-time modeler full size airplane flight instruc tor will make progress fun easy during week stay beautiful far western North Carolina Write call information RC Fight Training 3 1704 3894968 WILLIAMS ACCESSORIES BROTHERS _______________ 4 PILOTS STANDARD TSMAN VINTAGE TH CONTOUR BALLOON EN AGE - 4 ENGINES PRATT & WHITNEY HT HONE 3 VICKERS DAU BELLUM LSASE FOR FREE ILLUSTRATED ORDER FORM DEPT MA 151 PAWNEE ST SAN MARCOS CALIFORNIA 92069 170 Model Aviation ers Editor Continued page 115 Wonderful Memories Wonderful Modelers goals upon retiring get back old-time free flight model building started about left off years ago 1939 Zipper powered 1940 Ohlsson 23 ignition engine Hobby Horn kit dream build less 30 oz completed airplane promised real soarer thrilled attended Bong Eagles-Chicago Aeronuts recent free flight contest spectator once again familiarize myself activity took Zipper along afterthought After getting hyped up watching activity went off myself try test flight engine run 15 sec very low power Zipper reached about 150 feet altitudewhich stayed very slowly lazily soared south circling like hawk After chasing foot mile came shore lake airplane continued across water out sight over woods meadow beyond successful flight cost Zipper few days later received phone call Mr Jack Boone Mukwonago Wisconsin member Bong Eagles Jack witnessed flight evening flew over area own Cessna 172 until spotted Zipper near cornfield next day drove 25 miles back scene recovered model before calling other activity world could build such consideration perfect stranger story doesnt end As left chase Zipper car wide open flight box small paper carton containing few essentials tailgate cleaned out box few days later found business card bottom Mr Leo J Dringoli Northfield Illinois back card penciled note read hope didnt lose beautiful Zipper fly out Kenosha Airport will help look air have always felt some attributes make model builders unique people Perhaps natural skill patience dedication survivability adaptability determinationall combine create modeling enthusiast As reflect over events past few days well other wonderful contacts Ive made through modeling sense fraternal bond exists among enjoy hobby kind bond brings Boones Dringolis extend themselves others perfect strangers did wouldnt us just unselfishly share equipment offer assist run aid Continued page 176 tIRK UflU ________ LFL2GRT 2~S1I1/9 iimrr -6 lb 1116 Wooo Iast 97UE LO. O0s . Th 37Wom 939 b tj boo~ 615 6221171FUR 2030 bIE be] 04 pb Typical 45 Will Turn 13-6 Over 10000 Get 3 Mm Oz & Idle Well Below 2000 UNLEASH POWER WITHIN DIESELIZE its AWESOME Bigger Engine Won t Fit MORE POWER BIGGER PROPS COOL RUNNING LESS NOISE NO GLOWPLUGS LOW IDLE Largest Producer Model Diesel Fuels Call 203 877-1670 send 75 stamped #10 SASE & $200 Davis Diesel Development PO Box 141 ord CT 06460 World Leader Model Diesel Technology Since 1975 S T & WHITNEY HONE WRIGHT E 2TTNSJ II 730 Snapper$650 CL Based classic 1954 1/2A Snapper 48/2-in-span midwing profile stunter designed around Fox 35 will handle almost 25-35 engine No 193 StIletto CL Stool 00401 McDonald winnen 1970 1980 1982 PAl World Champs$ 375 No262 Crenheeeter CL oraah-prOOl trainer Two sizesi 5/30 35/40 power$ 120 No3101930 Fleet Biplane SC Spod Scale tot 35/40 power 4-chonnel Spana 55 1/5 scala 2 plan aheels$ 625 Ne3IdOroke II RCKnnWillardstlping boatfor3chennel 15 power Flytroon landwrth renrenablegear$ 375 No326 Teplar Cab SC Don SodI Schoalpard Scale 101049 power 23 ohannal Spana SOlo$ 350 No332 Zephyr RC smell 2-channal Glider tar hand-looncln tow therrrral alope soaring6 200 Na 366 Loner 260 SC Spod Scale raplina chanrpionnhip Aarohatic liar FordS power4-5 channel an streets0 1075 aJNe 447 tl2A Mine Anrerlee SC Old Timer 1/28 Teoaco erodel br 049 glow 2 channels$ 650 03Ne 536 SlotIto Slew-Me9ee 15 SC Tailless Ilping wing br 15 power Spans 60 3 channel$ 350 Ne 976 Sehoteleer l-26B RC Goarlerncnle Sailplane Spans 125 2 plan sheats$1475 Ne 561 Gee Bee Mattel Vs SC Golden Age Racer Spans 72-in 1/S scele tar 60 power 3 plan shears$1170 0 C Ne 566 Merteb SC Slopo-Soa/ng Sailplane Spans 4110. 260 channels6 42S 0Ne 596 Coreaat ISO SCAsoint StdTirner enlarged ISO% Spans 72 45- 4-stroke/SO- 2stroke6 85/3 C\iNe 603 Sparronot Hawk P30 FF Cowpetition robber-power plane won 1987 Nets Spans 36 in5 225 e 646 WInter Newk FF gobSetpower Cooped Hicar competition plane Spans 47 in375 II 5 tOe 656 47106 BC Speelel SC Aerohatic apod plane 40 power Spans kiln 3 plan sheets$1070 Ne 6gdToereeol SCTrainer/Spodnterstyladaherthe FlO Spans 66 40161 power 4 plan sheets61525 Ne 661 Eerhep-Oerotie FE Ewh5/o hodarance robber power plane Spans 205 in5 200 oNw 667 AT-fl CL Sewiscale protile Stanter tsr 35140 power Spans 47156 575 Ne 673 Kreekejoo SC apdeted cewion 01 pioneer spod plane Spans 74 2 plan sheets$1375 Ne 674 Kneerpler SC 075-powened hieclric semi-scala bi-winger Spans 38 inS S7S o No 675 BDF-t FE Osin-tailed spod tImer 00002 Pee Wee engine Spans 25 in0 225 No 676 HItler SC hain-eleGec high-wing Spoc ship designed tar Hiline lwp 30 0nlor Has tricycle gear spans dOin5 400 Na 677 Theederhint CL Stonter ton 20-35 power Two plan sheets drewn lro0 originnl 1862 Veco kit Spans 54 in 0 975 Ne 676 Been Bee FF West Coast Sastonian Oatdoor design Opens iSin156 Ne 679 Big Binget Lange SC SpoWler spans g 120-24 power 2 plan sheets$1700 E wNe 681 1669 Baste BD4 FE Soober Scale model spens 150 ing 325 O66664 Stoogarolsg Beech 3-Channel SC Ochoolperd-Scale hi-wing Spocater Fot 049 power Spans 32 in6 375 Na 666 Feller SC Panern-typo spoO plane 2-or 4-opole power Spans 65 in$ 725 No666 SteeBh GlItter FE robberhand-laoeched toanobalsa Canard CatepalhSteahh Glider combo Spons 95 ing 200 NNe 669 Ttsoeson Meene Oossd SOC SC 1/5 scale hiplane tar 90 power Spans a3 3 plan sheets$1975 6 No6923 Meter Seootar SC high pedarntance Sailplane Spans 118 in2 plan sheets$1100 66 Pete Cot FF P30 Class AMA Senior reaard holder Spans 31 in$ 225 gNo667 Tlgarkftten F SC high pedarnranco Spad Aerahatia design 00/15 Cahalt elealtic power SpansShin$ igoS 03CJNo666 Top Cot 90L-1 FE Sosber FAI Indoan Stick Gliderholds AMA Cat FiD Stick National Records Spans 13125 2 plan sheets$ 3Sg 766 Bondyn Dinne SC economical cersatila SpooTrainer Ideal br 15 power Weighs 33-na Spans 56 in$ 075 2 No701 Jeespln Gee SC high pedarmnance Spodster designed tot ton lip enents Weighs 0-lb spans 40 40-40 powerS 725 No 703 Helekel NE 16 FE Scala model 011924 German nrnnaplana HiLine Mini-k geered olectria motor Spans2O in$ 200 Na 703 Otoadhopper SC Grant Scale Spodstem reminiscent 18300 Heath harneSailt Spans 00 Par 00 power 2 plan sheets$1456 No709 Zeettls FE Hand-toonch Glider tar cerloos aamnpet6ian Wing DT Spans IS in. 35-00 grews5 200 0No766 0-Gone SC law aing 45-50-powered Sped Aembatic design reminiscent 0118304 Kincer Span span plane Spans 570 in$ 500 N -No767 52P Tracker CL Scale twrn-009-pasaered model Gromannan design Spans 39 in$ 325 No 766 PGM TInier FE rotrber-poweredttainer ideal tar intradoatian SOD flying Opens 1km$ 100 No766 AIr Coder SC FE ton tiler/trainer tar 020 power Stick-aed-tissae model recelleats Cessna Bird Dng Spans 36 in$ 480 E 0 Qalekle 366 SC Pylon recer end Spad tIler tar intermediate boildar//tller Can raced CL 6026 power Foam wing spans 40 . $ 550 qNo711 Fekker 6-It Tppa FE SOG SoSher-powered Oatdcet Stick model Senseniscont 85/OIl Gemman tighter Spans 230 in$ 205 No712 Vetetet Besllgo L-OOTP SC Sped Scale cersico Finnish Vinke nmilitorp trainer Far Goadma am Zenaah power spans Shin 2 plan sheets . $1000 13MIg29 FE CatapoltGlider PonernedaSerSaasiandenmanstratartlawn atCleaoland Ohio 1991 Spans l3mn$ 220 c60714 Mad Desk SC oser-triendly SpoO Ilier tar meloced slow Ilight hecells law slow Iraneosors Fnr 25-36 power Spans 60 2 plan sheetsg 9og No715 Stephene ACre SC Goanor scale aeratratic plane spans 720 ases 75190 power 2 plan sheets$ 1375 V6No716 Stow Poker FE Secard-setsng lntdcer HLG opens 240 Wood stroctare reintoroed carson n$ 200 No717 SentIence NC Corehet Ptene SC SparlICamnbat tiler tram Sossie tar 30cc engine 3-channels spans 475-in $ 075 710 IBeBIpa SC cemy aemahatia ton lIp bipe design John Hontan Spans 650-in tar 3g.45 power 2 plan sIneets$ 600 - No710 Ante SC Etectdc podarmnanae/spod Glidem Far 96 direat-drice natar P00 channels Spans 69 aedable tap systew 2 plan sheets $ 725 720 MIneteeton FE Prank Zaics papolar all-belsa-cocemed robber-powered model taken tram PapolamOolenca lane 1001 Spans 20 in$ 200 o 6No 721 LII Feller SC mid-wing Ion lip spod plane Folly aemahatic 4-channel central Far 40-51 power Spans 48-in$ 600 5-Ne 722 Locep M-6/s FE Goobled 70-5g-n tronm Bostonian design Far Mini-k rnator 50 mnAH traneries Spans 198n-in0 220 6Ne 723 AnIn 87 CL Designed Poland try P10mm Zawade Ada Poanan Intended ter Shoe Aerabalico Progreem Par 15 powerr Spans 36/a-in6 400 CG No72dThn Seeratwepee SC GiantScale nnid-wingaeratratiashiptakenlronnadginal l947otaetdesign SpansOg-in 2 plansheets$1600 o No700 CardInal 69 CL Stonter alassic 19600 lines snip 4 Stont ships ecer awarded 55 appoeramace points Spans 62/a-in 60 power$ 112S 63No726 Cie-Ak-Dee SC trlecric-powored light-weight Cessna oak-alike ton Ilyar designed tar 000 molar k-call pools Spans 02/a-in 2 plen shoots$1125 6 No 727 CerlIne SF7C Seahawk CL Molti-porpase Siwinger Can canspete troth Pratile Scelo hacy Carder Spans 32-in Far 35140 power$ 4gO 730 Eleegrie BelellOn 450 FE trlnctnaaancernian Can holt tar k-cell Class am 7-cell Class B Spans 50/a-in Astmollde 030 Cotrae motor$ 725 Cl3I [v32][b-1-10-1-10]] Circle numbers plans wish order best handling pleaSe include requests 0 Cl Ipayment some other service plans order COn 1932623103143263323864c7 539578588598603646650654 03661667672674675676677678 681684686688689692696 o 2697699700701702703705706 vZO707708709710711712713714 E l3 I715716717718719720721722 0686 o 724725726727728729730 n price includes tirst class postage US delivery Air Mail over 300 miles 0 orders non-US addresses please add $250 Air Mail postage handling plan E Make check money order payable US tunds drawn US bank ModelAviation AMA 1810 66 Samuel Morse Dr Reston VA 220g0 PleaSe allow 3 6 weeks tor delivery Please print carefullyEnclosed $ I_________________________________ 6 NAMEAMANo c I STREET 6 N I CITY ~- STATEZIP n j v32][b-1-10-1-10]] CL AerobaticslMcMillan Continued page 91 dark paint silver ink plane reminded tip Glen Meador Lou Dudka inking metallic inks best type use found disposable pens art stores Simply drill small hole end container away tip fill Rapidograph ink water based early silver gold inks corrosive make mistake can cleaned Prepsol-type degreasers still fresh Best yet draws super line flows just like good drafting india ink Also subject inking usually erase problems isopropyl alcohol youre quick can done cleanly works well last cauldron however found acrylic lacquer color alcohol worked fine ink also started work paint So careful soft touch moistened tissue rather saturated best approach Youre Talking Continued page 114 should investigate other forms RC combat popular different parts country find out contests run what type aircraft used After dont totally agree some types RC combat Ive read about group safety conscious using common sense Im going lobby get type combat banned After Mr Stetter still feels inclined against RC combat will staunchly support right object Dan Snow Maynard Massachusetts FF MO-llLinstrum Continued page 99 point necessary weighting nose clay Downthrust right thrust may required Once trimming has done can increase motor length turns Happy htiidiiigsr carrier ace ers Editor Continued page 170 others distress share pain loss crash What wonderful brotherhood share through modeling Leroy J Konrath Fox Point Wisconsin 176 Model Aviation -SIZE PLANS 729 Ti gercat$1400 RC lectric 73-in-span evolution TigerKitten low-wing sporflaerobatic ship can handle up Cobalt 60 motor 28 1200 mAh cells serious aerobatic performance 2 plan sheets
Edition: Model Aviation - 1993/01
Page Numbers: 5, 63, 115, 170, 176
Letters Editor As power engineer 25-plus years heavy industrial experience read alarm article Junkbox Air Compressor November 1992 issue Model Aviation believe someone could severely injured possible resultant liability claims should compressed air unit built manner Although engine can easily converted function compressor materials recommended suitable temperatures pressures involved 50 psi discharge temperature will about 3000F 100 psi about SOOT Specific comments Use plastics will soften near compressor discharge Use PCV valves designed pressure Use soft solder discharge joints melts about 4500F Use water heater relief valve designed compressed air use Most temperature reliefsnot pressure reliefs Use Freon tank designed re-use alr receiver Most specifically state Re-Use tank Use rubber stopper engine conversion will eventually deteriorate because high temperature Lack receiver drain valve condensation removal Users should also made aware possibility internal explosion homemade compressor hot spots inside ignite lubricating oiL/hot air mixture safetys sake would highly recommend purchase small properly designed compressed air system Cost should $150 lessa small price pay prevent loss eye fire ones home Robert J Moffat Viscount Canada .And Heres article Model Aviation November 92 titled Junkbox Air Compressor Joel Hamm creative informative AMA member concerned safety air conditioning refrigeration technician must protest suggested use empty Freon tank air accumulator tanks protected internally against rust corrosion Refrigerant moisture-free product large percentage air water therefore tanks have tendency rust unnoticeably inside out providing potentially dangerous situation used air tank actual warning label tank reads follows refill use purpose Federal law forbids transportation refilledpenalty up $25000 fine five years imprisonment 49USC 1809 store wet corrosive environment After use vent remaining pressure leave valve open dispose empty container properly Never use air tank would think wiser move would go local auto parts store hardware store flea market purchase DOT-approved portable air tank new sells $20 $30 used about $10 small price pay safety Richard F Canup Cocoa Florida Taking Exception am writing about deBolts article Primer Aerodynamics September issue cant help respect deBolt modeler also cant avoid saying explanation wing produces lift completely erroneous sketch lower-left corner page 28 shows molecules air flow over wing both airfoil produces lift symmetrical does As molecules pass over wing sketch shows coming closer together both airstream direction perpendicular top surface bottom implies increase air density molecules per cubic inch say speeds models fly just plain wrong molecules indeed come closer together direction perpendicular air flow go farther apart flow direction amount almost exactly keeps air density constant increased molecule spacing flow Continued page 63 APC PROPELLERS Sound Supression Design High Thrust Efficiency Long Fiber Advanced Composite Material Proven Performance US Masters US Nationals Canadian Nationals World Championships SPORTS SIZES 57x36x27x345678910$159 8x4 567 8910$179 9x45678910$199 95x 45 lii x 345678910$229 11x3456789$249 ll5x412x678$289 13x6$425 REVERSE PITCH PUSHER 9x6 lflxS 7 8 11 x67$395 COMPETITION 63 x4 65 x 37 76 x 46 7 9 x 65 85 95 x 65N iN 75N 8N 85N 1D5x 45$395 lix 10 11 12 12W 13 14 12x9 9W 1010W 11 uN 11512 12N 125 13 13N 14 125x9 101111512 125 13 13 x 910$795 135x9 1012513314 14x6 8101213 135 14 144x 1051213 145x 14N 15 x 8 10111216x81012$1295 MULTIBLADE onent Propeller Systems 2-bladelSx 8 1012$2200 20x8 10 12 14$2500 22x8 10 12 14 16$3100 24x10 12 14 16$3800 3-Blade17x 10 lBx 10 19x 11$3300 20x10 12 14 21 x12$3700 22x10 12 14 16$4600 24x10 12 14 16$5500 Multi Blade Hubs2-Blade 18-19 dia$3000 2-Blade 20-21 dia$3500 2-Blade 22 dia$4000 2-Blade 24 dia$6000 3-Blade 17-19 dia$4500 3-Blade 20-21 dia$5500 3-Blade 22 dia$6500 3-Blade 24 dia$9000 Contact local hobby dealer first doesnt have what need order direct 816-661-6515 Manutactumd Landing PodsCtS PO Box 938 KnIghts Landing CA 98645 January1993 5 Lets Practice Safety. Letters Editor Continued page 5 direction consistent increased flow velocity according Bernoullis law creates decrease pressure decrease greater over upper surface lower net result lift Also sketches show flow molecules separating surfaces separation does indeed [occur] large aircraft near stall small models some degree under almost flight conditions manner shown sketch separation plays no part production lift fact lift would greater no separation As gospel air considered stationary flight created craft moving through ifflight equally well created air moving aircraft fixed wind-tunnels work gliders can slope-soar Later deBolt makes distinction between gas fluid Equating fluid liquid common error Both gases liquids fluid look up Websters common error perhaps therefore excusable goes say loosely knit nature air opposed liquid characteristic makes flight possible Wrong speeds well below speed sound aerodynamic theory based assumption air incompressible theory experiment agree quite well same theory works water other fluid Hydrofoil boats have wings fly water Properly weighted model gliders fly very nicely under water Later says Lift drag increase square increases speed implies speed increases 10% lift increases 10% 10% 1% fact increases 21% correctly lift drag increase square speed rather are increases speed toughest part about explaining lift explaining Bernoullis law states pressure reduced velocity increased seems contrary nature Bob Meuser Oakland California Paper Planes Young People applaud efforts Hampton Virginia group described August 1992 issue World Record Paper Airplane can proud achievement hope serves example other groups around country Paper airplanes seem hold natural attraction youngsters AIAA St Louis Scietice Center have cosponsored paper airplane contests St Louis recent Continued page 115 Tigercat/Benjamin Continued page 61 solid nonstick base lamination process will assured glue wood edging securely wax rubbing spare candle Working wood strip time wet piece lightly draw around template youve chosen wood carefully should easy Use plastic sheet waxed paper under form prevent its sticking board Secure strips temporarily inserting heavy pins along outer edge template inner strip pinned place applied generous bead Hot Stuff UFO Thick inside strip moving pins outer edge worked way around template kept strip tension working place first strip doesnt come out satisfaction consider practice exercise another Its really difficult results worth effort Give finished laminate shot Kick-It accelerator allow set few moments remove template slight springback wont problem part assembled Continued page 68 A Push-Rod Selection Leaves Up InTheAir Its true offer complete line push-rods world thats important reason choose Sullivan push-rods fact once its model doesnt matter other push-rods carry just want yours work best its will Sullivan push-rods designed built maximum strength flexibility dependability Theyre also light weiit well simply best uy Which means get widest choice Sullivan PRODUC push-rods get best choice P0 BCx5166 Baltimore MD 21224 Getting Better Ideas Off Ground January1993 63 RC Flying Today/Myers Continued page 66 new narrow-band radios doesnt solve RC radio problems Dear George thought new narrow-band radios supposed cure problems So come receiver RC24 went nuts pits whenever two transmitters RC4O RC56 turned same time trans mitters FM receiver AM AM transmitter off time /s/W K Weinrich AMA 158422 Miami Springs FL Heres figure answer problem Take RC channel numbers question Subtract RC40 RC56 what get Sixteen channels Subtract RC24 RC4O what get Sixteen channels Thats written invitation old friend 31M third-order intermodulation pay us visit Three transmitters separated equal numbers channels always invite 31M doesnt matter whether spacing 2 channels 20 problem same An intermodulation signal starts weak falls off rapidly distance Thats AMA Membership Manual recommends flight stations spaced 25 feet apart really need know about situation WK described Question #1 transmitters 25 feet apart Question #2 far transmitters receiver receiver transmitter listen will listen anything else sounds like transmitterin case spurious 31M signal FM transmitters 25 feet apart receiver 50 feet transmitters time some checking Heres good place start letter has summer date WK seem recall gets hot Florida summer Putting black plastic RC transmitter case hot sun can drastically change transmitters characteristics Most electronics technicians like work air-conditioned rooms can assume gold sticker radio went 750F Put thermometer inside black plastic case leave out midday sun knows what temperature will reach wouldnt surprised read 1500F Electronic circuits components dislike kind heat receiver suspect too doesnt like heat either wrapped up foam rubber cocoon stuffed airless room hot exhaust gases washing over wall would feel wrapped foam rubber sleeping bag set out summer sun Im exaggerating little make point Narrow-band equipment does good job treat right cant expect miracle under $200 have help along three people fly together lot should get another channellike RC33 instance hope hints will solve problem ers Editor Continued page 63 years have attracted up 100 entrants year mostly under- 14 age groups received good local media coverage think modeling community missing sure bet getting involved programs nature Along making contribution science education potential recruiting new young modelers other Guinness paper airplane record may interest readers indoor duration record 172 seconds held colleague fellow McDonnell FF club member Ken Blackburn record set indoors seems right down alley indoor HLG fliers Tom McAtee Hazeiwood Missouri Nats Critique Having attended five Nats Los Alamitos Riverside Lincoln Reno Westover can say affair far best organized highest quality ample support sanitation communication individual event direction present offer contestants good level playing field Casual gripes aside staff volunteers endless energy courteous help needed Kudos top bottom splendid job Any no-shows whatever reason should regret word spreads around AMA bashers will have shorter podium after constructive criticism two model people tend go internal time especially under contest stress consequently always best job explaining ourselves public would suggest simple event rules procedures placards posted venue table should large print written laymenlwomenFor example fascinated intense CL combat goingson quite up answering spectator questions about wins after midairs proposed signs could helpful recyclable year year Secondly mini-museum set up near HQ tent food area featuring facets AMA flight/sport activities would nicewith actual models static display comprehensive photo boards callouts Possibly difficult worthwhile fact would recommend expansion Nats onsite PR materials displays stuff available Finally videocassettes prior Nats good quality should available public 15 20 bucks think John Oldenkamp San Diego Cali fornia Ed note photos enjoyed November 1992 Nationals edition Model Aviation taken gifted photographer hardworking AMA member Thanks John giving us photo album event year--the Nationals Chicopee Continued page 170 CL Racing/Ballard Continued page 96 interior surfaces tank shown should give about 30-32 laps 9 x 7 APC prop aircraft can effectively block faster Bill Bischoff originated design has satisfied racers Texas area Golden Age air racing have flood letters requesting information Golden Age racers Enclosed month general aircraft requirements racing rules George McGinnis has sent some spectacular photos aircraft participants recent contest information available George McGinnis Hanson Hobby Inc 830 Main Street PO Box 150 Hanson MA 02341 call 617 293-2804 Rat Race piloting pilot walks smallest circle elapsed race time may reduced 5 15 seconds As races determined tenths second can difference between victory also-ran photo Howard Shahan Larry Dziak Jr shows both pilots leaning center circle positions make little passing especially airspeeds close Most rat races today won lost pits good pilot 5-second slower aircraft can effectively block faster competitor backwalking circle imposing additional pressure pit crew fast stop other area time saving shut down elapsed time three seconds can lost gliding extra unpowered lap slow approaches pitman Remember contest race preparation work saving time teams race performance will improve As always comments photos solicited Write address shown above uary1993 115 RC Flight Training Beginner advanced tailored indMduai long-time modeler full size airplane flight instruc tor will make progress fun easy during week stay beautiful far western North Carolina Write call information RC Fight Training 3 1704 3894968 WILLIAMS ACCESSORIES BROTHERS _______________ 4 PILOTS STANDARD TSMAN VINTAGE TH CONTOUR BALLOON EN AGE - 4 ENGINES PRATT & WHITNEY HT HONE 3 VICKERS DAU BELLUM LSASE FOR FREE ILLUSTRATED ORDER FORM DEPT MA 151 PAWNEE ST SAN MARCOS CALIFORNIA 92069 170 Model Aviation ers Editor Continued page 115 Wonderful Memories Wonderful Modelers goals upon retiring get back old-time free flight model building started about left off years ago 1939 Zipper powered 1940 Ohlsson 23 ignition engine Hobby Horn kit dream build less 30 oz completed airplane promised real soarer thrilled attended Bong Eagles-Chicago Aeronuts recent free flight contest spectator once again familiarize myself activity took Zipper along afterthought After getting hyped up watching activity went off myself try test flight engine run 15 sec very low power Zipper reached about 150 feet altitudewhich stayed very slowly lazily soared south circling like hawk After chasing foot mile came shore lake airplane continued across water out sight over woods meadow beyond successful flight cost Zipper few days later received phone call Mr Jack Boone Mukwonago Wisconsin member Bong Eagles Jack witnessed flight evening flew over area own Cessna 172 until spotted Zipper near cornfield next day drove 25 miles back scene recovered model before calling other activity world could build such consideration perfect stranger story doesnt end As left chase Zipper car wide open flight box small paper carton containing few essentials tailgate cleaned out box few days later found business card bottom Mr Leo J Dringoli Northfield Illinois back card penciled note read hope didnt lose beautiful Zipper fly out Kenosha Airport will help look air have always felt some attributes make model builders unique people Perhaps natural skill patience dedication survivability adaptability determinationall combine create modeling enthusiast As reflect over events past few days well other wonderful contacts Ive made through modeling sense fraternal bond exists among enjoy hobby kind bond brings Boones Dringolis extend themselves others perfect strangers did wouldnt us just unselfishly share equipment offer assist run aid Continued page 176 tIRK UflU ________ LFL2GRT 2~S1I1/9 iimrr -6 lb 1116 Wooo Iast 97UE LO. O0s . Th 37Wom 939 b tj boo~ 615 6221171FUR 2030 bIE be] 04 pb Typical 45 Will Turn 13-6 Over 10000 Get 3 Mm Oz & Idle Well Below 2000 UNLEASH POWER WITHIN DIESELIZE its AWESOME Bigger Engine Won t Fit MORE POWER BIGGER PROPS COOL RUNNING LESS NOISE NO GLOWPLUGS LOW IDLE Largest Producer Model Diesel Fuels Call 203 877-1670 send 75 stamped #10 SASE & $200 Davis Diesel Development PO Box 141 ord CT 06460 World Leader Model Diesel Technology Since 1975 S T & WHITNEY HONE WRIGHT E 2TTNSJ II 730 Snapper$650 CL Based classic 1954 1/2A Snapper 48/2-in-span midwing profile stunter designed around Fox 35 will handle almost 25-35 engine No 193 StIletto CL Stool 00401 McDonald winnen 1970 1980 1982 PAl World Champs$ 375 No262 Crenheeeter CL oraah-prOOl trainer Two sizesi 5/30 35/40 power$ 120 No3101930 Fleet Biplane SC Spod Scale tot 35/40 power 4-chonnel Spana 55 1/5 scala 2 plan aheels$ 625 Ne3IdOroke II RCKnnWillardstlping boatfor3chennel 15 power Flytroon landwrth renrenablegear$ 375 No326 Teplar Cab SC Don SodI Schoalpard Scale 101049 power 23 ohannal Spana SOlo$ 350 No332 Zephyr RC smell 2-channal Glider tar hand-looncln tow therrrral alope soaring6 200 Na 366 Loner 260 SC Spod Scale raplina chanrpionnhip Aarohatic liar FordS power4-5 channel an streets0 1075 aJNe 447 tl2A Mine Anrerlee SC Old Timer 1/28 Teoaco erodel br 049 glow 2 channels$ 650 03Ne 536 SlotIto Slew-Me9ee 15 SC Tailless Ilping wing br 15 power Spans 60 3 channel$ 350 Ne 976 Sehoteleer l-26B RC Goarlerncnle Sailplane Spans 125 2 plan sheats$1475 Ne 561 Gee Bee Mattel Vs SC Golden Age Racer Spans 72-in 1/S scele tar 60 power 3 plan shears$1170 0 C Ne 566 Merteb SC Slopo-Soa/ng Sailplane Spans 4110. 260 channels6 42S 0Ne 596 Coreaat ISO SCAsoint StdTirner enlarged ISO% Spans 72 45- 4-stroke/SO- 2stroke6 85/3 C\iNe 603 Sparronot Hawk P30 FF Cowpetition robber-power plane won 1987 Nets Spans 36 in5 225 e 646 WInter Newk FF gobSetpower Cooped Hicar competition plane Spans 47 in375 II 5 tOe 656 47106 BC Speelel SC Aerohatic apod plane 40 power Spans kiln 3 plan sheets$1070 Ne 6gdToereeol SCTrainer/Spodnterstyladaherthe FlO Spans 66 40161 power 4 plan sheets61525 Ne 661 Eerhep-Oerotie FE Ewh5/o hodarance robber power plane Spans 205 in5 200 oNw 667 AT-fl CL Sewiscale protile Stanter tsr 35140 power Spans 47156 575 Ne 673 Kreekejoo SC apdeted cewion 01 pioneer spod plane Spans 74 2 plan sheets$1375 Ne 674 Kneerpler SC 075-powened hieclric semi-scala bi-winger Spans 38 inS S7S o No 675 BDF-t FE Osin-tailed spod tImer 00002 Pee Wee engine Spans 25 in0 225 No 676 HItler SC hain-eleGec high-wing Spoc ship designed tar Hiline lwp 30 0nlor Has tricycle gear spans dOin5 400 Na 677 Theederhint CL Stonter ton 20-35 power Two plan sheets drewn lro0 originnl 1862 Veco kit Spans 54 in 0 975 Ne 676 Been Bee FF West Coast Sastonian Oatdoor design Opens iSin156 Ne 679 Big Binget Lange SC SpoWler spans g 120-24 power 2 plan sheets$1700 E wNe 681 1669 Baste BD4 FE Soober Scale model spens 150 ing 325 O66664 Stoogarolsg Beech 3-Channel SC Ochoolperd-Scale hi-wing Spocater Fot 049 power Spans 32 in6 375 Na 666 Feller SC Panern-typo spoO plane 2-or 4-opole power Spans 65 in$ 725 No666 SteeBh GlItter FE robberhand-laoeched toanobalsa Canard CatepalhSteahh Glider combo Spons 95 ing 200 NNe 669 Ttsoeson Meene Oossd SOC SC 1/5 scale hiplane tar 90 power Spans a3 3 plan sheets$1975 6 No6923 Meter Seootar SC high pedarntance Sailplane Spans 118 in2 plan sheets$1100 66 Pete Cot FF P30 Class AMA Senior reaard holder Spans 31 in$ 225 gNo667 Tlgarkftten F SC high pedarnranco Spad Aerahatia design 00/15 Cahalt elealtic power SpansShin$ igoS 03CJNo666 Top Cot 90L-1 FE Sosber FAI Indoan Stick Gliderholds AMA Cat FiD Stick National Records Spans 13125 2 plan sheets$ 3Sg 766 Bondyn Dinne SC economical cersatila SpooTrainer Ideal br 15 power Weighs 33-na Spans 56 in$ 075 2 No701 Jeespln Gee SC high pedarmnance Spodster designed tot ton lip enents Weighs 0-lb spans 40 40-40 powerS 725 No 703 Helekel NE 16 FE Scala model 011924 German nrnnaplana HiLine Mini-k geered olectria motor Spans2O in$ 200 Na 703 Otoadhopper SC Grant Scale Spodstem reminiscent 18300 Heath harneSailt Spans 00 Par 00 power 2 plan sheets$1456 No709 Zeettls FE Hand-toonch Glider tar cerloos aamnpet6ian Wing DT Spans IS in. 35-00 grews5 200 0No766 0-Gone SC law aing 45-50-powered Sped Aembatic design reminiscent 0118304 Kincer Span span plane Spans 570 in$ 500 N -No767 52P Tracker CL Scale twrn-009-pasaered model Gromannan design Spans 39 in$ 325 No 766 PGM TInier FE rotrber-poweredttainer ideal tar intradoatian SOD flying Opens 1km$ 100 No766 AIr Coder SC FE ton tiler/trainer tar 020 power Stick-aed-tissae model recelleats Cessna Bird Dng Spans 36 in$ 480 E 0 Qalekle 366 SC Pylon recer end Spad tIler tar intermediate boildar//tller Can raced CL 6026 power Foam wing spans 40 . $ 550 qNo711 Fekker 6-It Tppa FE SOG SoSher-powered Oatdcet Stick model Senseniscont 85/OIl Gemman tighter Spans 230 in$ 205 No712 Vetetet Besllgo L-OOTP SC Sped Scale cersico Finnish Vinke nmilitorp trainer Far Goadma am Zenaah power spans Shin 2 plan sheets . $1000 13MIg29 FE CatapoltGlider PonernedaSerSaasiandenmanstratartlawn atCleaoland Ohio 1991 Spans l3mn$ 220 c60714 Mad Desk SC oser-triendly SpoO Ilier tar meloced slow Ilight hecells law slow Iraneosors Fnr 25-36 power Spans 60 2 plan sheetsg 9og No715 Stephene ACre SC Goanor scale aeratratic plane spans 720 ases 75190 power 2 plan sheets$ 1375 V6No716 Stow Poker FE Secard-setsng lntdcer HLG opens 240 Wood stroctare reintoroed carson n$ 200 No717 SentIence NC Corehet Ptene SC SparlICamnbat tiler tram Sossie tar 30cc engine 3-channels spans 475-in $ 075 710 IBeBIpa SC cemy aemahatia ton lIp bipe design John Hontan Spans 650-in tar 3g.45 power 2 plan sIneets$ 600 - No710 Ante SC Etectdc podarmnanae/spod Glidem Far 96 direat-drice natar P00 channels Spans 69 aedable tap systew 2 plan sheets $ 725 720 MIneteeton FE Prank Zaics papolar all-belsa-cocemed robber-powered model taken tram PapolamOolenca lane 1001 Spans 20 in$ 200 o 6No 721 LII Feller SC mid-wing Ion lip spod plane Folly aemahatic 4-channel central Far 40-51 power Spans 48-in$ 600 5-Ne 722 Locep M-6/s FE Goobled 70-5g-n tronm Bostonian design Far Mini-k rnator 50 mnAH traneries Spans 198n-in0 220 6Ne 723 AnIn 87 CL Designed Poland try P10mm Zawade Ada Poanan Intended ter Shoe Aerabalico Progreem Par 15 powerr Spans 36/a-in6 400 CG No72dThn Seeratwepee SC GiantScale nnid-wingaeratratiashiptakenlronnadginal l947otaetdesign SpansOg-in 2 plansheets$1600 o No700 CardInal 69 CL Stonter alassic 19600 lines snip 4 Stont ships ecer awarded 55 appoeramace points Spans 62/a-in 60 power$ 112S 63No726 Cie-Ak-Dee SC trlecric-powored light-weight Cessna oak-alike ton Ilyar designed tar 000 molar k-call pools Spans 02/a-in 2 plen shoots$1125 6 No 727 CerlIne SF7C Seahawk CL Molti-porpase Siwinger Can canspete troth Pratile Scelo hacy Carder Spans 32-in Far 35140 power$ 4gO 730 Eleegrie BelellOn 450 FE trlnctnaaancernian Can holt tar k-cell Class am 7-cell Class B Spans 50/a-in Astmollde 030 Cotrae motor$ 725 Cl3I [v32][b-1-10-1-10]] Circle numbers plans wish order best handling pleaSe include requests 0 Cl Ipayment some other service plans order COn 1932623103143263323864c7 539578588598603646650654 03661667672674675676677678 681684686688689692696 o 2697699700701702703705706 vZO707708709710711712713714 E l3 I715716717718719720721722 0686 o 724725726727728729730 n price includes tirst class postage US delivery Air Mail over 300 miles 0 orders non-US addresses please add $250 Air Mail postage handling plan E Make check money order payable US tunds drawn US bank ModelAviation AMA 1810 66 Samuel Morse Dr Reston VA 220g0 PleaSe allow 3 6 weeks tor delivery Please print carefullyEnclosed $ I_________________________________ 6 NAMEAMANo c I STREET 6 N I CITY ~- STATEZIP n j v32][b-1-10-1-10]] CL AerobaticslMcMillan Continued page 91 dark paint silver ink plane reminded tip Glen Meador Lou Dudka inking metallic inks best type use found disposable pens art stores Simply drill small hole end container away tip fill Rapidograph ink water based early silver gold inks corrosive make mistake can cleaned Prepsol-type degreasers still fresh Best yet draws super line flows just like good drafting india ink Also subject inking usually erase problems isopropyl alcohol youre quick can done cleanly works well last cauldron however found acrylic lacquer color alcohol worked fine ink also started work paint So careful soft touch moistened tissue rather saturated best approach Youre Talking Continued page 114 should investigate other forms RC combat popular different parts country find out contests run what type aircraft used After dont totally agree some types RC combat Ive read about group safety conscious using common sense Im going lobby get type combat banned After Mr Stetter still feels inclined against RC combat will staunchly support right object Dan Snow Maynard Massachusetts FF MO-llLinstrum Continued page 99 point necessary weighting nose clay Downthrust right thrust may required Once trimming has done can increase motor length turns Happy htiidiiigsr carrier ace ers Editor Continued page 170 others distress share pain loss crash What wonderful brotherhood share through modeling Leroy J Konrath Fox Point Wisconsin 176 Model Aviation -SIZE PLANS 729 Ti gercat$1400 RC lectric 73-in-span evolution TigerKitten low-wing sporflaerobatic ship can handle up Cobalt 60 motor 28 1200 mAh cells serious aerobatic performance 2 plan sheets
Edition: Model Aviation - 1993/01
Page Numbers: 5, 63, 115, 170, 176
Letters Editor As power engineer 25-plus years heavy industrial experience read alarm article Junkbox Air Compressor November 1992 issue Model Aviation believe someone could severely injured possible resultant liability claims should compressed air unit built manner Although engine can easily converted function compressor materials recommended suitable temperatures pressures involved 50 psi discharge temperature will about 3000F 100 psi about SOOT Specific comments Use plastics will soften near compressor discharge Use PCV valves designed pressure Use soft solder discharge joints melts about 4500F Use water heater relief valve designed compressed air use Most temperature reliefsnot pressure reliefs Use Freon tank designed re-use alr receiver Most specifically state Re-Use tank Use rubber stopper engine conversion will eventually deteriorate because high temperature Lack receiver drain valve condensation removal Users should also made aware possibility internal explosion homemade compressor hot spots inside ignite lubricating oiL/hot air mixture safetys sake would highly recommend purchase small properly designed compressed air system Cost should $150 lessa small price pay prevent loss eye fire ones home Robert J Moffat Viscount Canada .And Heres article Model Aviation November 92 titled Junkbox Air Compressor Joel Hamm creative informative AMA member concerned safety air conditioning refrigeration technician must protest suggested use empty Freon tank air accumulator tanks protected internally against rust corrosion Refrigerant moisture-free product large percentage air water therefore tanks have tendency rust unnoticeably inside out providing potentially dangerous situation used air tank actual warning label tank reads follows refill use purpose Federal law forbids transportation refilledpenalty up $25000 fine five years imprisonment 49USC 1809 store wet corrosive environment After use vent remaining pressure leave valve open dispose empty container properly Never use air tank would think wiser move would go local auto parts store hardware store flea market purchase DOT-approved portable air tank new sells $20 $30 used about $10 small price pay safety Richard F Canup Cocoa Florida Taking Exception am writing about deBolts article Primer Aerodynamics September issue cant help respect deBolt modeler also cant avoid saying explanation wing produces lift completely erroneous sketch lower-left corner page 28 shows molecules air flow over wing both airfoil produces lift symmetrical does As molecules pass over wing sketch shows coming closer together both airstream direction perpendicular top surface bottom implies increase air density molecules per cubic inch say speeds models fly just plain wrong molecules indeed come closer together direction perpendicular air flow go farther apart flow direction amount almost exactly keeps air density constant increased molecule spacing flow Continued page 63 APC PROPELLERS Sound Supression Design High Thrust Efficiency Long Fiber Advanced Composite Material Proven Performance US Masters US Nationals Canadian Nationals World Championships SPORTS SIZES 57x36x27x345678910$159 8x4 567 8910$179 9x45678910$199 95x 45 lii x 345678910$229 11x3456789$249 ll5x412x678$289 13x6$425 REVERSE PITCH PUSHER 9x6 lflxS 7 8 11 x67$395 COMPETITION 63 x4 65 x 37 76 x 46 7 9 x 65 85 95 x 65N iN 75N 8N 85N 1D5x 45$395 lix 10 11 12 12W 13 14 12x9 9W 1010W 11 uN 11512 12N 125 13 13N 14 125x9 101111512 125 13 13 x 910$795 135x9 1012513314 14x6 8101213 135 14 144x 1051213 145x 14N 15 x 8 10111216x81012$1295 MULTIBLADE onent Propeller Systems 2-bladelSx 8 1012$2200 20x8 10 12 14$2500 22x8 10 12 14 16$3100 24x10 12 14 16$3800 3-Blade17x 10 lBx 10 19x 11$3300 20x10 12 14 21 x12$3700 22x10 12 14 16$4600 24x10 12 14 16$5500 Multi Blade Hubs2-Blade 18-19 dia$3000 2-Blade 20-21 dia$3500 2-Blade 22 dia$4000 2-Blade 24 dia$6000 3-Blade 17-19 dia$4500 3-Blade 20-21 dia$5500 3-Blade 22 dia$6500 3-Blade 24 dia$9000 Contact local hobby dealer first doesnt have what need order direct 816-661-6515 Manutactumd Landing PodsCtS PO Box 938 KnIghts Landing CA 98645 January1993 5 Lets Practice Safety. Letters Editor Continued page 5 direction consistent increased flow velocity according Bernoullis law creates decrease pressure decrease greater over upper surface lower net result lift Also sketches show flow molecules separating surfaces separation does indeed [occur] large aircraft near stall small models some degree under almost flight conditions manner shown sketch separation plays no part production lift fact lift would greater no separation As gospel air considered stationary flight created craft moving through ifflight equally well created air moving aircraft fixed wind-tunnels work gliders can slope-soar Later deBolt makes distinction between gas fluid Equating fluid liquid common error Both gases liquids fluid look up Websters common error perhaps therefore excusable goes say loosely knit nature air opposed liquid characteristic makes flight possible Wrong speeds well below speed sound aerodynamic theory based assumption air incompressible theory experiment agree quite well same theory works water other fluid Hydrofoil boats have wings fly water Properly weighted model gliders fly very nicely under water Later says Lift drag increase square increases speed implies speed increases 10% lift increases 10% 10% 1% fact increases 21% correctly lift drag increase square speed rather are increases speed toughest part about explaining lift explaining Bernoullis law states pressure reduced velocity increased seems contrary nature Bob Meuser Oakland California Paper Planes Young People applaud efforts Hampton Virginia group described August 1992 issue World Record Paper Airplane can proud achievement hope serves example other groups around country Paper airplanes seem hold natural attraction youngsters AIAA St Louis Scietice Center have cosponsored paper airplane contests St Louis recent Continued page 115 Tigercat/Benjamin Continued page 61 solid nonstick base lamination process will assured glue wood edging securely wax rubbing spare candle Working wood strip time wet piece lightly draw around template youve chosen wood carefully should easy Use plastic sheet waxed paper under form prevent its sticking board Secure strips temporarily inserting heavy pins along outer edge template inner strip pinned place applied generous bead Hot Stuff UFO Thick inside strip moving pins outer edge worked way around template kept strip tension working place first strip doesnt come out satisfaction consider practice exercise another Its really difficult results worth effort Give finished laminate shot Kick-It accelerator allow set few moments remove template slight springback wont problem part assembled Continued page 68 A Push-Rod Selection Leaves Up InTheAir Its true offer complete line push-rods world thats important reason choose Sullivan push-rods fact once its model doesnt matter other push-rods carry just want yours work best its will Sullivan push-rods designed built maximum strength flexibility dependability Theyre also light weiit well simply best uy Which means get widest choice Sullivan PRODUC push-rods get best choice P0 BCx5166 Baltimore MD 21224 Getting Better Ideas Off Ground January1993 63 RC Flying Today/Myers Continued page 66 new narrow-band radios doesnt solve RC radio problems Dear George thought new narrow-band radios supposed cure problems So come receiver RC24 went nuts pits whenever two transmitters RC4O RC56 turned same time trans mitters FM receiver AM AM transmitter off time /s/W K Weinrich AMA 158422 Miami Springs FL Heres figure answer problem Take RC channel numbers question Subtract RC40 RC56 what get Sixteen channels Subtract RC24 RC4O what get Sixteen channels Thats written invitation old friend 31M third-order intermodulation pay us visit Three transmitters separated equal numbers channels always invite 31M doesnt matter whether spacing 2 channels 20 problem same An intermodulation signal starts weak falls off rapidly distance Thats AMA Membership Manual recommends flight stations spaced 25 feet apart really need know about situation WK described Question #1 transmitters 25 feet apart Question #2 far transmitters receiver receiver transmitter listen will listen anything else sounds like transmitterin case spurious 31M signal FM transmitters 25 feet apart receiver 50 feet transmitters time some checking Heres good place start letter has summer date WK seem recall gets hot Florida summer Putting black plastic RC transmitter case hot sun can drastically change transmitters characteristics Most electronics technicians like work air-conditioned rooms can assume gold sticker radio went 750F Put thermometer inside black plastic case leave out midday sun knows what temperature will reach wouldnt surprised read 1500F Electronic circuits components dislike kind heat receiver suspect too doesnt like heat either wrapped up foam rubber cocoon stuffed airless room hot exhaust gases washing over wall would feel wrapped foam rubber sleeping bag set out summer sun Im exaggerating little make point Narrow-band equipment does good job treat right cant expect miracle under $200 have help along three people fly together lot should get another channellike RC33 instance hope hints will solve problem ers Editor Continued page 63 years have attracted up 100 entrants year mostly under- 14 age groups received good local media coverage think modeling community missing sure bet getting involved programs nature Along making contribution science education potential recruiting new young modelers other Guinness paper airplane record may interest readers indoor duration record 172 seconds held colleague fellow McDonnell FF club member Ken Blackburn record set indoors seems right down alley indoor HLG fliers Tom McAtee Hazeiwood Missouri Nats Critique Having attended five Nats Los Alamitos Riverside Lincoln Reno Westover can say affair far best organized highest quality ample support sanitation communication individual event direction present offer contestants good level playing field Casual gripes aside staff volunteers endless energy courteous help needed Kudos top bottom splendid job Any no-shows whatever reason should regret word spreads around AMA bashers will have shorter podium after constructive criticism two model people tend go internal time especially under contest stress consequently always best job explaining ourselves public would suggest simple event rules procedures placards posted venue table should large print written laymenlwomenFor example fascinated intense CL combat goingson quite up answering spectator questions about wins after midairs proposed signs could helpful recyclable year year Secondly mini-museum set up near HQ tent food area featuring facets AMA flight/sport activities would nicewith actual models static display comprehensive photo boards callouts Possibly difficult worthwhile fact would recommend expansion Nats onsite PR materials displays stuff available Finally videocassettes prior Nats good quality should available public 15 20 bucks think John Oldenkamp San Diego Cali fornia Ed note photos enjoyed November 1992 Nationals edition Model Aviation taken gifted photographer hardworking AMA member Thanks John giving us photo album event year--the Nationals Chicopee Continued page 170 CL Racing/Ballard Continued page 96 interior surfaces tank shown should give about 30-32 laps 9 x 7 APC prop aircraft can effectively block faster Bill Bischoff originated design has satisfied racers Texas area Golden Age air racing have flood letters requesting information Golden Age racers Enclosed month general aircraft requirements racing rules George McGinnis has sent some spectacular photos aircraft participants recent contest information available George McGinnis Hanson Hobby Inc 830 Main Street PO Box 150 Hanson MA 02341 call 617 293-2804 Rat Race piloting pilot walks smallest circle elapsed race time may reduced 5 15 seconds As races determined tenths second can difference between victory also-ran photo Howard Shahan Larry Dziak Jr shows both pilots leaning center circle positions make little passing especially airspeeds close Most rat races today won lost pits good pilot 5-second slower aircraft can effectively block faster competitor backwalking circle imposing additional pressure pit crew fast stop other area time saving shut down elapsed time three seconds can lost gliding extra unpowered lap slow approaches pitman Remember contest race preparation work saving time teams race performance will improve As always comments photos solicited Write address shown above uary1993 115 RC Flight Training Beginner advanced tailored indMduai long-time modeler full size airplane flight instruc tor will make progress fun easy during week stay beautiful far western North Carolina Write call information RC Fight Training 3 1704 3894968 WILLIAMS ACCESSORIES BROTHERS _______________ 4 PILOTS STANDARD TSMAN VINTAGE TH CONTOUR BALLOON EN AGE - 4 ENGINES PRATT & WHITNEY HT HONE 3 VICKERS DAU BELLUM LSASE FOR FREE ILLUSTRATED ORDER FORM DEPT MA 151 PAWNEE ST SAN MARCOS CALIFORNIA 92069 170 Model Aviation ers Editor Continued page 115 Wonderful Memories Wonderful Modelers goals upon retiring get back old-time free flight model building started about left off years ago 1939 Zipper powered 1940 Ohlsson 23 ignition engine Hobby Horn kit dream build less 30 oz completed airplane promised real soarer thrilled attended Bong Eagles-Chicago Aeronuts recent free flight contest spectator once again familiarize myself activity took Zipper along afterthought After getting hyped up watching activity went off myself try test flight engine run 15 sec very low power Zipper reached about 150 feet altitudewhich stayed very slowly lazily soared south circling like hawk After chasing foot mile came shore lake airplane continued across water out sight over woods meadow beyond successful flight cost Zipper few days later received phone call Mr Jack Boone Mukwonago Wisconsin member Bong Eagles Jack witnessed flight evening flew over area own Cessna 172 until spotted Zipper near cornfield next day drove 25 miles back scene recovered model before calling other activity world could build such consideration perfect stranger story doesnt end As left chase Zipper car wide open flight box small paper carton containing few essentials tailgate cleaned out box few days later found business card bottom Mr Leo J Dringoli Northfield Illinois back card penciled note read hope didnt lose beautiful Zipper fly out Kenosha Airport will help look air have always felt some attributes make model builders unique people Perhaps natural skill patience dedication survivability adaptability determinationall combine create modeling enthusiast As reflect over events past few days well other wonderful contacts Ive made through modeling sense fraternal bond exists among enjoy hobby kind bond brings Boones Dringolis extend themselves others perfect strangers did wouldnt us just unselfishly share equipment offer assist run aid Continued page 176 tIRK UflU ________ LFL2GRT 2~S1I1/9 iimrr -6 lb 1116 Wooo Iast 97UE LO. O0s . Th 37Wom 939 b tj boo~ 615 6221171FUR 2030 bIE be] 04 pb Typical 45 Will Turn 13-6 Over 10000 Get 3 Mm Oz & Idle Well Below 2000 UNLEASH POWER WITHIN DIESELIZE its AWESOME Bigger Engine Won t Fit MORE POWER BIGGER PROPS COOL RUNNING LESS NOISE NO GLOWPLUGS LOW IDLE Largest Producer Model Diesel Fuels Call 203 877-1670 send 75 stamped #10 SASE & $200 Davis Diesel Development PO Box 141 ord CT 06460 World Leader Model Diesel Technology Since 1975 S T & WHITNEY HONE WRIGHT E 2TTNSJ II 730 Snapper$650 CL Based classic 1954 1/2A Snapper 48/2-in-span midwing profile stunter designed around Fox 35 will handle almost 25-35 engine No 193 StIletto CL Stool 00401 McDonald winnen 1970 1980 1982 PAl World Champs$ 375 No262 Crenheeeter CL oraah-prOOl trainer Two sizesi 5/30 35/40 power$ 120 No3101930 Fleet Biplane SC Spod Scale tot 35/40 power 4-chonnel Spana 55 1/5 scala 2 plan aheels$ 625 Ne3IdOroke II RCKnnWillardstlping boatfor3chennel 15 power Flytroon landwrth renrenablegear$ 375 No326 Teplar Cab SC Don SodI Schoalpard Scale 101049 power 23 ohannal Spana SOlo$ 350 No332 Zephyr RC smell 2-channal Glider tar hand-looncln tow therrrral alope soaring6 200 Na 366 Loner 260 SC Spod Scale raplina chanrpionnhip Aarohatic liar FordS power4-5 channel an streets0 1075 aJNe 447 tl2A Mine Anrerlee SC Old Timer 1/28 Teoaco erodel br 049 glow 2 channels$ 650 03Ne 536 SlotIto Slew-Me9ee 15 SC Tailless Ilping wing br 15 power Spans 60 3 channel$ 350 Ne 976 Sehoteleer l-26B RC Goarlerncnle Sailplane Spans 125 2 plan sheats$1475 Ne 561 Gee Bee Mattel Vs SC Golden Age Racer Spans 72-in 1/S scele tar 60 power 3 plan shears$1170 0 C Ne 566 Merteb SC Slopo-Soa/ng Sailplane Spans 4110. 260 channels6 42S 0Ne 596 Coreaat ISO SCAsoint StdTirner enlarged ISO% Spans 72 45- 4-stroke/SO- 2stroke6 85/3 C\iNe 603 Sparronot Hawk P30 FF Cowpetition robber-power plane won 1987 Nets Spans 36 in5 225 e 646 WInter Newk FF gobSetpower Cooped Hicar competition plane Spans 47 in375 II 5 tOe 656 47106 BC Speelel SC Aerohatic apod plane 40 power Spans kiln 3 plan sheets$1070 Ne 6gdToereeol SCTrainer/Spodnterstyladaherthe FlO Spans 66 40161 power 4 plan sheets61525 Ne 661 Eerhep-Oerotie FE Ewh5/o hodarance robber power plane Spans 205 in5 200 oNw 667 AT-fl CL Sewiscale protile Stanter tsr 35140 power Spans 47156 575 Ne 673 Kreekejoo SC apdeted cewion 01 pioneer spod plane Spans 74 2 plan sheets$1375 Ne 674 Kneerpler SC 075-powened hieclric semi-scala bi-winger Spans 38 inS S7S o No 675 BDF-t FE Osin-tailed spod tImer 00002 Pee Wee engine Spans 25 in0 225 No 676 HItler SC hain-eleGec high-wing Spoc ship designed tar Hiline lwp 30 0nlor Has tricycle gear spans dOin5 400 Na 677 Theederhint CL Stonter ton 20-35 power Two plan sheets drewn lro0 originnl 1862 Veco kit Spans 54 in 0 975 Ne 676 Been Bee FF West Coast Sastonian Oatdoor design Opens iSin156 Ne 679 Big Binget Lange SC SpoWler spans g 120-24 power 2 plan sheets$1700 E wNe 681 1669 Baste BD4 FE Soober Scale model spens 150 ing 325 O66664 Stoogarolsg Beech 3-Channel SC Ochoolperd-Scale hi-wing Spocater Fot 049 power Spans 32 in6 375 Na 666 Feller SC Panern-typo spoO plane 2-or 4-opole power Spans 65 in$ 725 No666 SteeBh GlItter FE robberhand-laoeched toanobalsa Canard CatepalhSteahh Glider combo Spons 95 ing 200 NNe 669 Ttsoeson Meene Oossd SOC SC 1/5 scale hiplane tar 90 power Spans a3 3 plan sheets$1975 6 No6923 Meter Seootar SC high pedarntance Sailplane Spans 118 in2 plan sheets$1100 66 Pete Cot FF P30 Class AMA Senior reaard holder Spans 31 in$ 225 gNo667 Tlgarkftten F SC high pedarnranco Spad Aerahatia design 00/15 Cahalt elealtic power SpansShin$ igoS 03CJNo666 Top Cot 90L-1 FE Sosber FAI Indoan Stick Gliderholds AMA Cat FiD Stick National Records Spans 13125 2 plan sheets$ 3Sg 766 Bondyn Dinne SC economical cersatila SpooTrainer Ideal br 15 power Weighs 33-na Spans 56 in$ 075 2 No701 Jeespln Gee SC high pedarmnance Spodster designed tot ton lip enents Weighs 0-lb spans 40 40-40 powerS 725 No 703 Helekel NE 16 FE Scala model 011924 German nrnnaplana HiLine Mini-k geered olectria motor Spans2O in$ 200 Na 703 Otoadhopper SC Grant Scale Spodstem reminiscent 18300 Heath harneSailt Spans 00 Par 00 power 2 plan sheets$1456 No709 Zeettls FE Hand-toonch Glider tar cerloos aamnpet6ian Wing DT Spans IS in. 35-00 grews5 200 0No766 0-Gone SC law aing 45-50-powered Sped Aembatic design reminiscent 0118304 Kincer Span span plane Spans 570 in$ 500 N -No767 52P Tracker CL Scale twrn-009-pasaered model Gromannan design Spans 39 in$ 325 No 766 PGM TInier FE rotrber-poweredttainer ideal tar intradoatian SOD flying Opens 1km$ 100 No766 AIr Coder SC FE ton tiler/trainer tar 020 power Stick-aed-tissae model recelleats Cessna Bird Dng Spans 36 in$ 480 E 0 Qalekle 366 SC Pylon recer end Spad tIler tar intermediate boildar//tller Can raced CL 6026 power Foam wing spans 40 . $ 550 qNo711 Fekker 6-It Tppa FE SOG SoSher-powered Oatdcet Stick model Senseniscont 85/OIl Gemman tighter Spans 230 in$ 205 No712 Vetetet Besllgo L-OOTP SC Sped Scale cersico Finnish Vinke nmilitorp trainer Far Goadma am Zenaah power spans Shin 2 plan sheets . $1000 13MIg29 FE CatapoltGlider PonernedaSerSaasiandenmanstratartlawn atCleaoland Ohio 1991 Spans l3mn$ 220 c60714 Mad Desk SC oser-triendly SpoO Ilier tar meloced slow Ilight hecells law slow Iraneosors Fnr 25-36 power Spans 60 2 plan sheetsg 9og No715 Stephene ACre SC Goanor scale aeratratic plane spans 720 ases 75190 power 2 plan sheets$ 1375 V6No716 Stow Poker FE Secard-setsng lntdcer HLG opens 240 Wood stroctare reintoroed carson n$ 200 No717 SentIence NC Corehet Ptene SC SparlICamnbat tiler tram Sossie tar 30cc engine 3-channels spans 475-in $ 075 710 IBeBIpa SC cemy aemahatia ton lIp bipe design John Hontan Spans 650-in tar 3g.45 power 2 plan sIneets$ 600 - No710 Ante SC Etectdc podarmnanae/spod Glidem Far 96 direat-drice natar P00 channels Spans 69 aedable tap systew 2 plan sheets $ 725 720 MIneteeton FE Prank Zaics papolar all-belsa-cocemed robber-powered model taken tram PapolamOolenca lane 1001 Spans 20 in$ 200 o 6No 721 LII Feller SC mid-wing Ion lip spod plane Folly aemahatic 4-channel central Far 40-51 power Spans 48-in$ 600 5-Ne 722 Locep M-6/s FE Goobled 70-5g-n tronm Bostonian design Far Mini-k rnator 50 mnAH traneries Spans 198n-in0 220 6Ne 723 AnIn 87 CL Designed Poland try P10mm Zawade Ada Poanan Intended ter Shoe Aerabalico Progreem Par 15 powerr Spans 36/a-in6 400 CG No72dThn Seeratwepee SC GiantScale nnid-wingaeratratiashiptakenlronnadginal l947otaetdesign SpansOg-in 2 plansheets$1600 o No700 CardInal 69 CL Stonter alassic 19600 lines snip 4 Stont ships ecer awarded 55 appoeramace points Spans 62/a-in 60 power$ 112S 63No726 Cie-Ak-Dee SC trlecric-powored light-weight Cessna oak-alike ton Ilyar designed tar 000 molar k-call pools Spans 02/a-in 2 plen shoots$1125 6 No 727 CerlIne SF7C Seahawk CL Molti-porpase Siwinger Can canspete troth Pratile Scelo hacy Carder Spans 32-in Far 35140 power$ 4gO 730 Eleegrie BelellOn 450 FE trlnctnaaancernian Can holt tar k-cell Class am 7-cell Class B Spans 50/a-in Astmollde 030 Cotrae motor$ 725 Cl3I [v32][b-1-10-1-10]] Circle numbers plans wish order best handling pleaSe include requests 0 Cl Ipayment some other service plans order COn 1932623103143263323864c7 539578588598603646650654 03661667672674675676677678 681684686688689692696 o 2697699700701702703705706 vZO707708709710711712713714 E l3 I715716717718719720721722 0686 o 724725726727728729730 n price includes tirst class postage US delivery Air Mail over 300 miles 0 orders non-US addresses please add $250 Air Mail postage handling plan E Make check money order payable US tunds drawn US bank ModelAviation AMA 1810 66 Samuel Morse Dr Reston VA 220g0 PleaSe allow 3 6 weeks tor delivery Please print carefullyEnclosed $ I_________________________________ 6 NAMEAMANo c I STREET 6 N I CITY ~- STATEZIP n j v32][b-1-10-1-10]] CL AerobaticslMcMillan Continued page 91 dark paint silver ink plane reminded tip Glen Meador Lou Dudka inking metallic inks best type use found disposable pens art stores Simply drill small hole end container away tip fill Rapidograph ink water based early silver gold inks corrosive make mistake can cleaned Prepsol-type degreasers still fresh Best yet draws super line flows just like good drafting india ink Also subject inking usually erase problems isopropyl alcohol youre quick can done cleanly works well last cauldron however found acrylic lacquer color alcohol worked fine ink also started work paint So careful soft touch moistened tissue rather saturated best approach Youre Talking Continued page 114 should investigate other forms RC combat popular different parts country find out contests run what type aircraft used After dont totally agree some types RC combat Ive read about group safety conscious using common sense Im going lobby get type combat banned After Mr Stetter still feels inclined against RC combat will staunchly support right object Dan Snow Maynard Massachusetts FF MO-llLinstrum Continued page 99 point necessary weighting nose clay Downthrust right thrust may required Once trimming has done can increase motor length turns Happy htiidiiigsr carrier ace ers Editor Continued page 170 others distress share pain loss crash What wonderful brotherhood share through modeling Leroy J Konrath Fox Point Wisconsin 176 Model Aviation -SIZE PLANS 729 Ti gercat$1400 RC lectric 73-in-span evolution TigerKitten low-wing sporflaerobatic ship can handle up Cobalt 60 motor 28 1200 mAh cells serious aerobatic performance 2 plan sheets