V/o aM Compressed Air Power FORGET WHAT YOU may have previ ously read beard about compressed air model airplane power source Com pressed air motors no longer antique ex cept choose keep past alive building flying types popular Twenties early Thir ties Today new technology developed aly Paolo Zanin incidentally also produces pulse jet engines has produced modern compressed air motor pressure tank literally revolutionizing cat egory power new motor named Tiquattro MM3 Z Models Zanins company small 04 cu light 42 grams 15 oz soft-drink-type transparent plastic tank comes motor weighs 16 oz balsa tail boom has 28 oz liquid volume motor plastic well fact cylinder transparent can see parts piston crankshaft connecting rod poppet valve etc working mo tor runs Sidelight connecting rod directly connected crankshafton up stroke ball end rod centers itself bottom piston conical downstroke piston stops travel ing compressed air exhausts connecting rod keeps going down Top picture graceful well-proportIoned lines Jonathan model contribute its good performance characteristics pressure tank exceedingly strong easily damaged Kit model construction combination balsa plastic Left colorful box encloses revolutionary Jonathan compressed air motor/model produced Z Models Italy emblem box proclaims Ecological Air Propulsion since air used power no pollution air noise kit also contains small bicycle-type hand pump Right shot kit components wing halves have already joined Thats real construction necessary ARF almost ready-to-fly model tail sections simply slip boom slots Pump up tank supplied pump model ready fly October 1990 91 Left The fuselage tail boomlwing mount comes already glued soft plastic pressure tank motor mountlcowllng slips over front clear plastic tank taped place wings rubberbanded mount Right pressure tank little different com mon soft drink bottle suggesting larger bottle could substituted order achieve longer motor runs pressure relief valve built pressure tank cap no special fittings required fit plastic fuel-line-type tubing between motor tank Left The plastic tubing kit-supplied hand pump simply plugs filler valve cowling Approximately 80 pump strokes adequate pressurize tank Adding pressure becomes very difficult pump making overpressurizing unlikelyan herent safety factor avoids possibility bursting tank motor completely transparent making moving parts visible Right easier pressurizing automotive-type foot pump gauge may substituted particular gauge reads 100 psi de vice air line right emits audible signal preset pressure reached good idea especially no pressure gauge used up again Thus internal drag pis ton reduceda neat trick avoid wast ing power through unnecessary friction motor materials have selected avoid lubrication problems no lubri cation required Since fuel com pressed air moving parts operating clean atmosphere compatible Also motor-fuel combination cause high temperatures no significant heat problem can occur Helping situation relatively low motor speedtypically about 4000 rpm highest initial power Operation similar CO2 carbon diox ide icing problem Noise low actually pleasant-soundingmore like loud purr Starting instantaneous flip C02 once tank pressur ized No motor adjustment necessary rpm determined tank pressure greater initial pressure higher initial rpm Note chart rpm vs time initial pressure Basically useful power run about i mm 20 sec can ex pected initial charge 80 lb per sq inch varying 4000 1600 rpm fire up compressed air motor first step pressurize tank Using bicycle-type air pump pressure built up proportion number strokes plastic bicycle-type hand pump provided Jonathan package num ber strokes good measure what expectvery roughly pound pres sure per pump stroke other words 50 strokes provides about RPM Running Starting 80 lb RPM 4400 4000 3600 3200 2800 2400 2000 1600 1200 800 Time Plot Pressure --IL 20406080100 Seconds 92 Model Aviation 50 lb pressure ample early test flights Between 60 70 strokes pro vides enough extra pressure make ma jor difference power Its hard supplied hand pump can reach 80 90 strokes very hard pump ing further increase pressure will yield additional major gain motor per formance tank labeled caution sign saying maximum pressure seven bars equates about 100 lb per sq 7 x 147 lb atmospheric pressure may possible achieve 100 lb using pump supplied seems very difficult Which just well since tank might blow up easy However pressure relief valve built system supposedly prevent pumping too much pressure relief valve should relied upon though since theres no assurance accuracy An easier comfortable pressurecharging system may used such foot pedal T-handled old-fashioned type bi cycle automotive air pump uses bracket bottom foot hold pump steady stroke up down An air pressure gauge such Continued page 192 Bill Effin gee * sayso PIes o Psttstn Sets give yoa meorted degigu yes W5Ot have selected hest clossic designs 11 tints tnt yoc choose hoe Th patterns tot port ste sn important enclusic testate One-ThIrd Scale Piper Tn-Pacer PA-22J 115-21e-- wise span eq wing ersa 3t cld engine Fe 45 oh sIC so 12th. 01-110 overall InsetS RC3g-3$2010 inth20zvn 1/3 Scale Piper Cub 1-3 119 wise spas eneth 2100 en wine ste. 4 oh SIC 20-ag old engisas 0C292$2910 Ducted Fans Navy F4D1 Skyray 114 e eseth 48% wtn4 span Ig h SIC tattthle Landise Gear 9CDF203110 1 noel 5 44 length 23ii wIne span is SIC 29th SIC IIK725 fans SCOFi$1910 Quarter Scale WV/I SE-5A $0Awing span 2220sq wing area 78 22 engines RCI3S7 6 SPAD CXIII 7$/s wing span sq Capohlo $yw 4 captures imagination RCQS-$ 0 FOKKER DR-i TRIPLANE e73 wing spans 1772 en wing area 78 tel 50 engines RCQS-ti 6 N SOPWITH CAMEL F1 $4 wing span e 21 50 sq wing areas 11 win S/C wnnd ta hale consoconion over 05 sq ft drawings $COS1 1 6 past Romanians tally 21111 Rounding out rest final stand ings Japan fourth Finland fifth France sixth United Kingdom seventh Federal Republic Germany eighth Switzerland ninth Eleven flights over 40 minutes re corded flown Americans Bob Ran dolph six feat may rank some sort unofficial record World Championships competition Jim Richmond three Cezar Banks two Rene Rutty sixth-place finisher Switzer land missed magic 40 mark mere seven seconds second flight day touched down 3953 Following two-hour break rest refurbishment contestants officials interested spectators awards banquet held Sheraton Hotel capped presentation medals trophies top three individuals Rich mond Banks Randolph teams United States Canada Romania story would complete further mention Romanian team Aurel Moraru Vasile Nicoara Aureal Popa concern generosity Oakland Cloud Duster Bud Romak scrappy East European trio would have meet price airline ticket alone two-thirds nual salaries explained Romak prevented former government coming 88 championships got telegram month ago saying could come didnt have financial backing trip So became sponsor Romak has friend mentor pa tron Eastern European Indoor fliers since first met 1966 World Championships Hungary using straw motor sticks hair bracing virtually no access modeling supplies know left models won individ ual championship Lew Gitlow Indoor Model Supply donated wood other sup plies 68 championships Ever since days treat like brother try treat same way Romak lives California met Romanians New York drove Johnson City predicted would sure third possibly second indeed finished third less ter minute behind second-place C nadian team Theyre really special concluded Compressed Air/Worth Continued page 92 pump good idea can actual pressure its being pumped pumps equipped gauges available stores like K-Mart Wal-Mar etc can attached line separate pressure limiter setting adjustment produce beep desired pressure reached also able Getting back basics simply use pump provided give 50 60 want performance rt quires pressure suggestion get better pump use some means reading pressure can won up about 90 lb difference perforni ance significant Initial flights Jonathan indoors large Mini-Dome Eastern Tennesse State University during Indoor Ni tional Championships last June height buildings interior t bottom girders 116 ft ground floor area 420 208 ft plus other 100 ft side seats Jonathan easily got about 80 ft height about 50-ft-dia circles takin about 40 seconds get high other 30 gradually circle down smooth landing About 80 pump stroke roughly 80 lb initial pressure deli ered performance amounts proximately foot altitude per pum stroke impression 90 IC strokes Jonathan would have reached alt tude least 100 ft Performance out box fine f small-field outdoor flying football field 192 Model Aviation 1/4 Scale Pokksr 0-ViII 10 wingspan sq wing atea 9025 cid engine 35 cli hs $COSh 5 Golden Age 1/4 Scale Curtiss Hewk P-i $8 length span 5 2210 sq iv wing ares 13 23 engines li 9/C SCOS-id 6 1/4 Scale Curds Falcon $3 length wing span 0 sq iv wing area4ch$IC$COSt3$2$96 Psonding MnwhrA$ c Icr cemplete ploen sub ansencry & $210 ehipeins waitIng sshni New ireftvdehlO cc yvrc fitet 04511 WE TECHNICAL Rt iBox29OOASanteRoss0..FL THE GLOWPLUG DESIGNED FOR Pu/s mc e s/ ng n engine LONGER LIFE4 HIGHER RPMSII I OCTOBER 18-21 1990 OHARE EXPO BOOTH -tiK #1267 MAKE THE GLOBEE / INDY CONNECTION Twinn-K Inc 10296 W Washington St Indianapolis IN 46231 Telephone 317-839-6579FAX 317-839-8928 No666 Blitz$1075 RC Sportster spans 48 uses hot 28/32 power Two plan shts No 667 AT-6$575 CL Semiscale Profile Stunter 35/40 power spans 47 No 668 Slow Worm$500 FF AMA Class competition plane 09/15 power spans 54 No 193Stiletto CL Stunt model McDonald winner 1970 1980 1982 FAI World Champs$3 75 No 262Craehmaater CL Cr000-proof trainer two sizes1S30 35/40 power $125 No 3101930 Fleet Biplane AC Sport Scale 35140 4-channel Wingspan 56 in. /s scale two sheets. S625 No 314Drake II RC Ken willards flying boat 3-channel 15-power Fly land removable gear$375 No 328Taylor Cub AC Don StalIn Schoolyard-Scale 049s 2-3 channel Spans 50 inS350 No 332Zephyr AC Small 2-channel glider hand-launch tow thermal slope touring$200 No 366Laaer 200 RC Spurt Scale replica championship Aerohetic flier Unes 40 pOwer 4-5 channel Two sheetoS1075 No 447112A Mirn America RC DId-Timer Texaco model 049 glow 2-channels$650 No 460440 AC Shoulder-wing sport flier 4-cycle 40-size engine 4 channels5650 No 465Blue Max Ii AC Fun-fly tyortuter 40-sloe engines spans 52 Lightweight struclare5700 No 533Ceaana C-37 RC Schoolyard Scale famous 30s plane 040/10 power 2-ch spoon 42 in$500 No 539Smelter Slow-Motion 15 AC Toilleso flying wing 15 engines spans 60 uses 3-ch ACS350 No 569Elecitroatreale AC Electric aerohatic plane spans 44 uaes 05 motorS550 No 572TR-260 AC Sport Scale Aerobatic plane 4-nt rohe 60/65 power spans 66 inS1100 No 576Serendlpilyl ndoor EZB record-holder spans 170R in$325 No 578Schweizer I-26B AC Quarter-scale Sailplane spans 125 Two plan sheets$1475 No 561Gee See Model Y AC Golden Age Aacer spans 72 C/s scale 60 power Three plan sheets$1175 No 566Snapdragon AC Fun-flylspurtoter fnr 25/30 engines spans 45 in$600 No 588MarIsh AC Slope-Snoring Sailplane spans 41 uses 2 AC channels$425 No 593Taylororett AC Sport Scale lightplane huilds utandard 2-placer clipped-wing air shnw stunter Spans either 70 58/a 30/40 two-otroke 40140 loor-ntmnke engine Two plan sheets no documentatinn$1000 No 598Coronet 150 AC-Assist Old-Timer enlarged lSOqh spans 72 uses 40-sloe 4-strskel30-size 2-strokeS650 No 601NIcitel AC Sportoter engine 3 AC channels Spans 44 in$500 No 603Span-ow Hawk P-30 FF Competition rubber-power plane won 87 Nuts Spans 30 inS225 No 607Curtiu Seagull AC giant Scale biplane spans 00 uses Quadral2enoah power Three plan sheets no docS2400 No 609Taperwing AC Pylon Ascer spuno 29/a Plan plus parts template sheetS600 No 610Protobype AC Sport biplane spans 40 uses 45/2-cycle 60/4-cycle powerS650 No 619Keith RIder R4 FF Scale Oniden Age racer robber power spans 18 in$300 No 620Gimlet 40 AC Sport/Pattem plane spans 60 4W50 engine 2 sheetsS1100 No 623ilendereon Longater AC Quarter-scale 1033 fliover spans 90/a 4-stroke 40/46 engine 3 plus sht no docS1650 No 624Keleher Lark AC Guarter-scole homeboilt spans 69 60/90 4-strnke power 2 plan sheets no risc$1100 No 626Sweepee AC Spnrt/Puttem cunards fsrward-swept wing spans 64 usen 40 power 2 plan sheets51300 No 626PrIme Cut AC Sport/Aerobafic plane spans 90 uses Quadra 35/40-size pswer Twe plan sheetsS1300 No 630OrIginal Fly Baby AC Old-Timer noons 72 uses 19I2S 2-cycle 40 4-cycle power 2 plan sheets51150 No 636The Gambler FF Indoor Onstunian robber-power cabin plane spans 15% in5200 No 638Keytwo AC Tri-geared low-wing spnrtster tsr 20/2S pnwer spans 44 inS575 No 638Owl Racer CL Scale Ascer fnr 040 power opano 20 inS225 No 639Skyvolt AC Tri-geared Electric aerebatic sportoter fur 05115 power spans 50 in5050 No 641LII Ole Reliable AC Old-Timer sport flier spans bOa/u engines$575 No 642BIpe 69 CL Partial plan updates deBoits 48 oemion 35cc power Spans 22/ in5225 No 644Bellanca Columbia AC Schoolyard Scule 2 AC channels engine Wingspan 46 in$575 No 645Lalrd Solution CL Profile Scale biplane spans 36 25/35 power$575 No 646Winter Hawk FF Aubber-power Coupe riHmner competitiun plane spans 47 in$375 No 647Cox SpecIal CL Semiscale biplane engine spans 24 in$300 No 648Curtlee OC2 FF Srullo Outdoor Gas Flying Scale biplane uses electric power spans 24 HiLine Mini-6 motorS325 No 649Thingamabob AC/CL Muhimode trainer 25 gun 00 electric power spans SiloS475 No 66347/66 RC Special AC Aerebatic nport plane 40 power spans 6110 3 plan sheetsS1075 No 651Coneortlum AC 6usd-Launch Hi-Start Glider spans 60 in5650 No 652Oar Fledarmaua AC Low-wing sport plane 20125 power spans 55 in5675 No 553Avantl CL Prohie Sport Scale cunard bioliner twin 049s spans 00 in$575 No 654Tamecat AC Truiner/sportater styled like F14 spans 66 40161 power Four plan sheets$1525 No 655Aetroatar FF AMA Cluso A/B Gas plane spans 67 in. ones 325/350cc power$800 No 856XFI3C CL Fraitle 15 Carrier plane spans 27/e in$550 No 657Super SquIre AC Trainer 35/40 2-otreke 53 4-strnke power upans 561/a In$750 No 688Shurlken Streak CL Trainer uses 2-line Monoline contrel spans 17 power5225 No 659Boone Box FF Wukefield Aubber competition plane spans 54 in$400 No 660Volkaplane AC Electric-powered aportoter 05 motor spans 56 2 plan shts$925 No 661Embry-Omatic FF Embryo Endurance rubber-power plane spanu 20 inS200 No 662Boxkite CL Scale antique canard pusher biplane spuns 42 2 plun uheeto51100 No 663Pea Patch AC Spnrtster spans 60 in, usen 40150 4-utreke power 2 plan ohentoS900 No 664Stuka Stunt CL Stuoter semiscule spans 3714 inS500 No 665Coneclentious Objector FF Mulvihill Aubber competition plane spans 50 Oat$575 0 03 0 O cj risC1 0 CO 00 0 00 no ico oE 200 Cfl Os0 O -o 00 Cog 00 C 0 - 0 - 00 00 0050 00 0 C 53 CD tO 0 00 v193262310314326332386447 000o -460465533539569572576578 CeO O-~ 581586588593598601603607 eDo&2609610619620623624626628 83ZZO630635636638639641642644 0 000to645646647648649650651652 O 0653654655656657658659660 662663664665666667668 -Co Plan price includes first Class postage US delivery Air Mail over 300 miles rders non-US address e add $250 Air Mail osta e handlin Make Check money order payable US funds drawn US bank ModelAviation AMA 1810 Samuel Morse Or, Reston VA 22090 Please allow 3 6 weeks delivery .Jno Please print carefully Enclosed $ _________________________ Os Ec NAME ___________________________________________ AMA No _______________ GE STREET Os wCITY TEZIP_ I--I Circle numbers of plans wish order best handling please include re-I quests payment some other service plans order II II II II II II I______ I___________________ II big enough isnt surrounded tall trees model weighs about 46 ouncet ready fly sufficiently heavy tC make out-of-sight flights unlikely thus nC dethermalizer appears necessary all-balsa wing tail assembly plus heavier necessary tail boom leave considerable room performanct improvement Using built-up wing tai construction would allow builder crease lifting surface area half much again double ex pected result would major performanc increase might well call addi tion dethermalizer other hand model withoL modification rugged easily repaired simply fun fly Itll give flight afte flight much risk flying away Fc fly small fields ait plane lets enjoy Free Flight complications higher performanc competition-type ship Compressed air-powered model flying clean quiet just enough motc buzz sound pleasant indicat power output Jonathan design mo ified simple means joining th wing halves flying disassembly fc carrying fits box 27 long 7 ir wide 3 deep including supplie hand pump disassembly model compact easily carried car Its wing span just under three feet makes easy have always handy car fo stopping flying schoolyards sport fields Jonathan compressed air-powere model practical fun opens up whole new world simple clean quit power Although created sold toy its also well-engineered exceller model design likely will rival chal lenge CO2 Electric power se larger radio-controlled versions come Availability present severely limited can quickly change deman grows Currently two sources manufacturer Z Models Via Solfc rino #1 31020 Frescada Treviso Italy English importer Mega Models Lar caster House Benpinck St Farnwort Bolton BL4 7EP England Fax 204-792 922 cost England 38 pounds abou $61 US complete package 25 pounds about $41 US motor pressure bottle alone Extra cost air ma shipment quotedthese prices ir dude postage mailing England As went press news arrived tht compressed air motor pioneer Bert Pooi associate Tom Nallen will ha motor/model combination sale US Write Bert 128 Warren Te race Longmeadow MA 01106 Introdut tory prices Package complete moto model $6795 plus $550 postage ar handling Package B motor prop tank $4495 plus $350 p&h Package motor prop $2795 plus $275 p&h 194 Model Aviation
Edition: Model Aviation - 1990/10
Page Numbers: 91, 92, 192, 194
Edition: Model Aviation - 1990/10
Page Numbers: 91, 92, 192, 194
V/o aM Compressed Air Power FORGET WHAT YOU may have previ ously read beard about compressed air model airplane power source Com pressed air motors no longer antique ex cept choose keep past alive building flying types popular Twenties early Thir ties Today new technology developed aly Paolo Zanin incidentally also produces pulse jet engines has produced modern compressed air motor pressure tank literally revolutionizing cat egory power new motor named Tiquattro MM3 Z Models Zanins company small 04 cu light 42 grams 15 oz soft-drink-type transparent plastic tank comes motor weighs 16 oz balsa tail boom has 28 oz liquid volume motor plastic well fact cylinder transparent can see parts piston crankshaft connecting rod poppet valve etc working mo tor runs Sidelight connecting rod directly connected crankshafton up stroke ball end rod centers itself bottom piston conical downstroke piston stops travel ing compressed air exhausts connecting rod keeps going down Top picture graceful well-proportIoned lines Jonathan model contribute its good performance characteristics pressure tank exceedingly strong easily damaged Kit model construction combination balsa plastic Left colorful box encloses revolutionary Jonathan compressed air motor/model produced Z Models Italy emblem box proclaims Ecological Air Propulsion since air used power no pollution air noise kit also contains small bicycle-type hand pump Right shot kit components wing halves have already joined Thats real construction necessary ARF almost ready-to-fly model tail sections simply slip boom slots Pump up tank supplied pump model ready fly October 1990 91 Left The fuselage tail boomlwing mount comes already glued soft plastic pressure tank motor mountlcowllng slips over front clear plastic tank taped place wings rubberbanded mount Right pressure tank little different com mon soft drink bottle suggesting larger bottle could substituted order achieve longer motor runs pressure relief valve built pressure tank cap no special fittings required fit plastic fuel-line-type tubing between motor tank Left The plastic tubing kit-supplied hand pump simply plugs filler valve cowling Approximately 80 pump strokes adequate pressurize tank Adding pressure becomes very difficult pump making overpressurizing unlikelyan herent safety factor avoids possibility bursting tank motor completely transparent making moving parts visible Right easier pressurizing automotive-type foot pump gauge may substituted particular gauge reads 100 psi de vice air line right emits audible signal preset pressure reached good idea especially no pressure gauge used up again Thus internal drag pis ton reduceda neat trick avoid wast ing power through unnecessary friction motor materials have selected avoid lubrication problems no lubri cation required Since fuel com pressed air moving parts operating clean atmosphere compatible Also motor-fuel combination cause high temperatures no significant heat problem can occur Helping situation relatively low motor speedtypically about 4000 rpm highest initial power Operation similar CO2 carbon diox ide icing problem Noise low actually pleasant-soundingmore like loud purr Starting instantaneous flip C02 once tank pressur ized No motor adjustment necessary rpm determined tank pressure greater initial pressure higher initial rpm Note chart rpm vs time initial pressure Basically useful power run about i mm 20 sec can ex pected initial charge 80 lb per sq inch varying 4000 1600 rpm fire up compressed air motor first step pressurize tank Using bicycle-type air pump pressure built up proportion number strokes plastic bicycle-type hand pump provided Jonathan package num ber strokes good measure what expectvery roughly pound pres sure per pump stroke other words 50 strokes provides about RPM Running Starting 80 lb RPM 4400 4000 3600 3200 2800 2400 2000 1600 1200 800 Time Plot Pressure --IL 20406080100 Seconds 92 Model Aviation 50 lb pressure ample early test flights Between 60 70 strokes pro vides enough extra pressure make ma jor difference power Its hard supplied hand pump can reach 80 90 strokes very hard pump ing further increase pressure will yield additional major gain motor per formance tank labeled caution sign saying maximum pressure seven bars equates about 100 lb per sq 7 x 147 lb atmospheric pressure may possible achieve 100 lb using pump supplied seems very difficult Which just well since tank might blow up easy However pressure relief valve built system supposedly prevent pumping too much pressure relief valve should relied upon though since theres no assurance accuracy An easier comfortable pressurecharging system may used such foot pedal T-handled old-fashioned type bi cycle automotive air pump uses bracket bottom foot hold pump steady stroke up down An air pressure gauge such Continued page 192 Bill Effin gee * sayso PIes o Psttstn Sets give yoa meorted degigu yes W5Ot have selected hest clossic designs 11 tints tnt yoc choose hoe Th patterns tot port ste sn important enclusic testate One-ThIrd Scale Piper Tn-Pacer PA-22J 115-21e-- wise span eq wing ersa 3t cld engine Fe 45 oh sIC so 12th. 01-110 overall InsetS RC3g-3$2010 inth20zvn 1/3 Scale Piper Cub 1-3 119 wise spas eneth 2100 en wine ste. 4 oh SIC 20-ag old engisas 0C292$2910 Ducted Fans Navy F4D1 Skyray 114 e eseth 48% wtn4 span Ig h SIC tattthle Landise Gear 9CDF203110 1 noel 5 44 length 23ii wIne span is SIC 29th SIC IIK725 fans SCOFi$1910 Quarter Scale WV/I SE-5A $0Awing span 2220sq wing area 78 22 engines RCI3S7 6 SPAD CXIII 7$/s wing span sq Capohlo $yw 4 captures imagination RCQS-$ 0 FOKKER DR-i TRIPLANE e73 wing spans 1772 en wing area 78 tel 50 engines RCQS-ti 6 N SOPWITH CAMEL F1 $4 wing span e 21 50 sq wing areas 11 win S/C wnnd ta hale consoconion over 05 sq ft drawings $COS1 1 6 past Romanians tally 21111 Rounding out rest final stand ings Japan fourth Finland fifth France sixth United Kingdom seventh Federal Republic Germany eighth Switzerland ninth Eleven flights over 40 minutes re corded flown Americans Bob Ran dolph six feat may rank some sort unofficial record World Championships competition Jim Richmond three Cezar Banks two Rene Rutty sixth-place finisher Switzer land missed magic 40 mark mere seven seconds second flight day touched down 3953 Following two-hour break rest refurbishment contestants officials interested spectators awards banquet held Sheraton Hotel capped presentation medals trophies top three individuals Rich mond Banks Randolph teams United States Canada Romania story would complete further mention Romanian team Aurel Moraru Vasile Nicoara Aureal Popa concern generosity Oakland Cloud Duster Bud Romak scrappy East European trio would have meet price airline ticket alone two-thirds nual salaries explained Romak prevented former government coming 88 championships got telegram month ago saying could come didnt have financial backing trip So became sponsor Romak has friend mentor pa tron Eastern European Indoor fliers since first met 1966 World Championships Hungary using straw motor sticks hair bracing virtually no access modeling supplies know left models won individ ual championship Lew Gitlow Indoor Model Supply donated wood other sup plies 68 championships Ever since days treat like brother try treat same way Romak lives California met Romanians New York drove Johnson City predicted would sure third possibly second indeed finished third less ter minute behind second-place C nadian team Theyre really special concluded Compressed Air/Worth Continued page 92 pump good idea can actual pressure its being pumped pumps equipped gauges available stores like K-Mart Wal-Mar etc can attached line separate pressure limiter setting adjustment produce beep desired pressure reached also able Getting back basics simply use pump provided give 50 60 want performance rt quires pressure suggestion get better pump use some means reading pressure can won up about 90 lb difference perforni ance significant Initial flights Jonathan indoors large Mini-Dome Eastern Tennesse State University during Indoor Ni tional Championships last June height buildings interior t bottom girders 116 ft ground floor area 420 208 ft plus other 100 ft side seats Jonathan easily got about 80 ft height about 50-ft-dia circles takin about 40 seconds get high other 30 gradually circle down smooth landing About 80 pump stroke roughly 80 lb initial pressure deli ered performance amounts proximately foot altitude per pum stroke impression 90 IC strokes Jonathan would have reached alt tude least 100 ft Performance out box fine f small-field outdoor flying football field 192 Model Aviation 1/4 Scale Pokksr 0-ViII 10 wingspan sq wing atea 9025 cid engine 35 cli hs $COSh 5 Golden Age 1/4 Scale Curtiss Hewk P-i $8 length span 5 2210 sq iv wing ares 13 23 engines li 9/C SCOS-id 6 1/4 Scale Curds Falcon $3 length wing span 0 sq iv wing area4ch$IC$COSt3$2$96 Psonding MnwhrA$ c Icr cemplete ploen sub ansencry & $210 ehipeins waitIng sshni New ireftvdehlO cc yvrc fitet 04511 WE TECHNICAL Rt iBox29OOASanteRoss0..FL THE GLOWPLUG DESIGNED FOR Pu/s mc e s/ ng n engine LONGER LIFE4 HIGHER RPMSII I OCTOBER 18-21 1990 OHARE EXPO BOOTH -tiK #1267 MAKE THE GLOBEE / INDY CONNECTION Twinn-K Inc 10296 W Washington St Indianapolis IN 46231 Telephone 317-839-6579FAX 317-839-8928 No666 Blitz$1075 RC Sportster spans 48 uses hot 28/32 power Two plan shts No 667 AT-6$575 CL Semiscale Profile Stunter 35/40 power spans 47 No 668 Slow Worm$500 FF AMA Class competition plane 09/15 power spans 54 No 193Stiletto CL Stunt model McDonald winner 1970 1980 1982 FAI World Champs$3 75 No 262Craehmaater CL Cr000-proof trainer two sizes1S30 35/40 power $125 No 3101930 Fleet Biplane AC Sport Scale 35140 4-channel Wingspan 56 in. /s scale two sheets. S625 No 314Drake II RC Ken willards flying boat 3-channel 15-power Fly land removable gear$375 No 328Taylor Cub AC Don StalIn Schoolyard-Scale 049s 2-3 channel Spans 50 inS350 No 332Zephyr AC Small 2-channel glider hand-launch tow thermal slope touring$200 No 366Laaer 200 RC Spurt Scale replica championship Aerohetic flier Unes 40 pOwer 4-5 channel Two sheetoS1075 No 447112A Mirn America RC DId-Timer Texaco model 049 glow 2-channels$650 No 460440 AC Shoulder-wing sport flier 4-cycle 40-size engine 4 channels5650 No 465Blue Max Ii AC Fun-fly tyortuter 40-sloe engines spans 52 Lightweight struclare5700 No 533Ceaana C-37 RC Schoolyard Scale famous 30s plane 040/10 power 2-ch spoon 42 in$500 No 539Smelter Slow-Motion 15 AC Toilleso flying wing 15 engines spans 60 uses 3-ch ACS350 No 569Elecitroatreale AC Electric aerohatic plane spans 44 uaes 05 motorS550 No 572TR-260 AC Sport Scale Aerobatic plane 4-nt rohe 60/65 power spans 66 inS1100 No 576Serendlpilyl ndoor EZB record-holder spans 170R in$325 No 578Schweizer I-26B AC Quarter-scale Sailplane spans 125 Two plan sheets$1475 No 561Gee See Model Y AC Golden Age Aacer spans 72 C/s scale 60 power Three plan sheets$1175 No 566Snapdragon AC Fun-flylspurtoter fnr 25/30 engines spans 45 in$600 No 588MarIsh AC Slope-Snoring Sailplane spans 41 uses 2 AC channels$425 No 593Taylororett AC Sport Scale lightplane huilds utandard 2-placer clipped-wing air shnw stunter Spans either 70 58/a 30/40 two-otroke 40140 loor-ntmnke engine Two plan sheets no documentatinn$1000 No 598Coronet 150 AC-Assist Old-Timer enlarged lSOqh spans 72 uses 40-sloe 4-strskel30-size 2-strokeS650 No 601NIcitel AC Sportoter engine 3 AC channels Spans 44 in$500 No 603Span-ow Hawk P-30 FF Competition rubber-power plane won 87 Nuts Spans 30 inS225 No 607Curtiu Seagull AC giant Scale biplane spans 00 uses Quadral2enoah power Three plan sheets no docS2400 No 609Taperwing AC Pylon Ascer spuno 29/a Plan plus parts template sheetS600 No 610Protobype AC Sport biplane spans 40 uses 45/2-cycle 60/4-cycle powerS650 No 619Keith RIder R4 FF Scale Oniden Age racer robber power spans 18 in$300 No 620Gimlet 40 AC Sport/Pattem plane spans 60 4W50 engine 2 sheetsS1100 No 623ilendereon Longater AC Quarter-scale 1033 fliover spans 90/a 4-stroke 40/46 engine 3 plus sht no docS1650 No 624Keleher Lark AC Guarter-scole homeboilt spans 69 60/90 4-strnke power 2 plan sheets no risc$1100 No 626Sweepee AC Spnrt/Puttem cunards fsrward-swept wing spans 64 usen 40 power 2 plan sheets51300 No 626PrIme Cut AC Sport/Aerobafic plane spans 90 uses Quadra 35/40-size pswer Twe plan sheetsS1300 No 630OrIginal Fly Baby AC Old-Timer noons 72 uses 19I2S 2-cycle 40 4-cycle power 2 plan sheets51150 No 636The Gambler FF Indoor Onstunian robber-power cabin plane spans 15% in5200 No 638Keytwo AC Tri-geared low-wing spnrtster tsr 20/2S pnwer spans 44 inS575 No 638Owl Racer CL Scale Ascer fnr 040 power opano 20 inS225 No 639Skyvolt AC Tri-geared Electric aerebatic sportoter fur 05115 power spans 50 in5050 No 641LII Ole Reliable AC Old-Timer sport flier spans bOa/u engines$575 No 642BIpe 69 CL Partial plan updates deBoits 48 oemion 35cc power Spans 22/ in5225 No 644Bellanca Columbia AC Schoolyard Scule 2 AC channels engine Wingspan 46 in$575 No 645Lalrd Solution CL Profile Scale biplane spans 36 25/35 power$575 No 646Winter Hawk FF Aubber-power Coupe riHmner competitiun plane spans 47 in$375 No 647Cox SpecIal CL Semiscale biplane engine spans 24 in$300 No 648Curtlee OC2 FF Srullo Outdoor Gas Flying Scale biplane uses electric power spans 24 HiLine Mini-6 motorS325 No 649Thingamabob AC/CL Muhimode trainer 25 gun 00 electric power spans SiloS475 No 66347/66 RC Special AC Aerebatic nport plane 40 power spans 6110 3 plan sheetsS1075 No 651Coneortlum AC 6usd-Launch Hi-Start Glider spans 60 in5650 No 652Oar Fledarmaua AC Low-wing sport plane 20125 power spans 55 in5675 No 553Avantl CL Prohie Sport Scale cunard bioliner twin 049s spans 00 in$575 No 654Tamecat AC Truiner/sportater styled like F14 spans 66 40161 power Four plan sheets$1525 No 655Aetroatar FF AMA Cluso A/B Gas plane spans 67 in. ones 325/350cc power$800 No 856XFI3C CL Fraitle 15 Carrier plane spans 27/e in$550 No 657Super SquIre AC Trainer 35/40 2-otreke 53 4-strnke power upans 561/a In$750 No 688Shurlken Streak CL Trainer uses 2-line Monoline contrel spans 17 power5225 No 659Boone Box FF Wukefield Aubber competition plane spans 54 in$400 No 660Volkaplane AC Electric-powered aportoter 05 motor spans 56 2 plan shts$925 No 661Embry-Omatic FF Embryo Endurance rubber-power plane spanu 20 inS200 No 662Boxkite CL Scale antique canard pusher biplane spuns 42 2 plun uheeto51100 No 663Pea Patch AC Spnrtster spans 60 in, usen 40150 4-utreke power 2 plan ohentoS900 No 664Stuka Stunt CL Stuoter semiscule spans 3714 inS500 No 665Coneclentious Objector FF Mulvihill Aubber competition plane spans 50 Oat$575 0 03 0 O cj risC1 0 CO 00 0 00 no ico oE 200 Cfl Os0 O -o 00 Cog 00 C 0 - 0 - 00 00 0050 00 0 C 53 CD tO 0 00 v193262310314326332386447 000o -460465533539569572576578 CeO O-~ 581586588593598601603607 eDo&2609610619620623624626628 83ZZO630635636638639641642644 0 000to645646647648649650651652 O 0653654655656657658659660 662663664665666667668 -Co Plan price includes first Class postage US delivery Air Mail over 300 miles rders non-US address e add $250 Air Mail osta e handlin Make Check money order payable US funds drawn US bank ModelAviation AMA 1810 Samuel Morse Or, Reston VA 22090 Please allow 3 6 weeks delivery .Jno Please print carefully Enclosed $ _________________________ Os Ec NAME ___________________________________________ AMA No _______________ GE STREET Os wCITY TEZIP_ I--I Circle numbers of plans wish order best handling please include re-I quests payment some other service plans order II II II II II II I______ I___________________ II big enough isnt surrounded tall trees model weighs about 46 ouncet ready fly sufficiently heavy tC make out-of-sight flights unlikely thus nC dethermalizer appears necessary all-balsa wing tail assembly plus heavier necessary tail boom leave considerable room performanct improvement Using built-up wing tai construction would allow builder crease lifting surface area half much again double ex pected result would major performanc increase might well call addi tion dethermalizer other hand model withoL modification rugged easily repaired simply fun fly Itll give flight afte flight much risk flying away Fc fly small fields ait plane lets enjoy Free Flight complications higher performanc competition-type ship Compressed air-powered model flying clean quiet just enough motc buzz sound pleasant indicat power output Jonathan design mo ified simple means joining th wing halves flying disassembly fc carrying fits box 27 long 7 ir wide 3 deep including supplie hand pump disassembly model compact easily carried car Its wing span just under three feet makes easy have always handy car fo stopping flying schoolyards sport fields Jonathan compressed air-powere model practical fun opens up whole new world simple clean quit power Although created sold toy its also well-engineered exceller model design likely will rival chal lenge CO2 Electric power se larger radio-controlled versions come Availability present severely limited can quickly change deman grows Currently two sources manufacturer Z Models Via Solfc rino #1 31020 Frescada Treviso Italy English importer Mega Models Lar caster House Benpinck St Farnwort Bolton BL4 7EP England Fax 204-792 922 cost England 38 pounds abou $61 US complete package 25 pounds about $41 US motor pressure bottle alone Extra cost air ma shipment quotedthese prices ir dude postage mailing England As went press news arrived tht compressed air motor pioneer Bert Pooi associate Tom Nallen will ha motor/model combination sale US Write Bert 128 Warren Te race Longmeadow MA 01106 Introdut tory prices Package complete moto model $6795 plus $550 postage ar handling Package B motor prop tank $4495 plus $350 p&h Package motor prop $2795 plus $275 p&h 194 Model Aviation
Edition: Model Aviation - 1990/10
Page Numbers: 91, 92, 192, 194
V/o aM Compressed Air Power FORGET WHAT YOU may have previ ously read beard about compressed air model airplane power source Com pressed air motors no longer antique ex cept choose keep past alive building flying types popular Twenties early Thir ties Today new technology developed aly Paolo Zanin incidentally also produces pulse jet engines has produced modern compressed air motor pressure tank literally revolutionizing cat egory power new motor named Tiquattro MM3 Z Models Zanins company small 04 cu light 42 grams 15 oz soft-drink-type transparent plastic tank comes motor weighs 16 oz balsa tail boom has 28 oz liquid volume motor plastic well fact cylinder transparent can see parts piston crankshaft connecting rod poppet valve etc working mo tor runs Sidelight connecting rod directly connected crankshafton up stroke ball end rod centers itself bottom piston conical downstroke piston stops travel ing compressed air exhausts connecting rod keeps going down Top picture graceful well-proportIoned lines Jonathan model contribute its good performance characteristics pressure tank exceedingly strong easily damaged Kit model construction combination balsa plastic Left colorful box encloses revolutionary Jonathan compressed air motor/model produced Z Models Italy emblem box proclaims Ecological Air Propulsion since air used power no pollution air noise kit also contains small bicycle-type hand pump Right shot kit components wing halves have already joined Thats real construction necessary ARF almost ready-to-fly model tail sections simply slip boom slots Pump up tank supplied pump model ready fly October 1990 91 Left The fuselage tail boomlwing mount comes already glued soft plastic pressure tank motor mountlcowllng slips over front clear plastic tank taped place wings rubberbanded mount Right pressure tank little different com mon soft drink bottle suggesting larger bottle could substituted order achieve longer motor runs pressure relief valve built pressure tank cap no special fittings required fit plastic fuel-line-type tubing between motor tank Left The plastic tubing kit-supplied hand pump simply plugs filler valve cowling Approximately 80 pump strokes adequate pressurize tank Adding pressure becomes very difficult pump making overpressurizing unlikelyan herent safety factor avoids possibility bursting tank motor completely transparent making moving parts visible Right easier pressurizing automotive-type foot pump gauge may substituted particular gauge reads 100 psi de vice air line right emits audible signal preset pressure reached good idea especially no pressure gauge used up again Thus internal drag pis ton reduceda neat trick avoid wast ing power through unnecessary friction motor materials have selected avoid lubrication problems no lubri cation required Since fuel com pressed air moving parts operating clean atmosphere compatible Also motor-fuel combination cause high temperatures no significant heat problem can occur Helping situation relatively low motor speedtypically about 4000 rpm highest initial power Operation similar CO2 carbon diox ide icing problem Noise low actually pleasant-soundingmore like loud purr Starting instantaneous flip C02 once tank pressur ized No motor adjustment necessary rpm determined tank pressure greater initial pressure higher initial rpm Note chart rpm vs time initial pressure Basically useful power run about i mm 20 sec can ex pected initial charge 80 lb per sq inch varying 4000 1600 rpm fire up compressed air motor first step pressurize tank Using bicycle-type air pump pressure built up proportion number strokes plastic bicycle-type hand pump provided Jonathan package num ber strokes good measure what expectvery roughly pound pres sure per pump stroke other words 50 strokes provides about RPM Running Starting 80 lb RPM 4400 4000 3600 3200 2800 2400 2000 1600 1200 800 Time Plot Pressure --IL 20406080100 Seconds 92 Model Aviation 50 lb pressure ample early test flights Between 60 70 strokes pro vides enough extra pressure make ma jor difference power Its hard supplied hand pump can reach 80 90 strokes very hard pump ing further increase pressure will yield additional major gain motor per formance tank labeled caution sign saying maximum pressure seven bars equates about 100 lb per sq 7 x 147 lb atmospheric pressure may possible achieve 100 lb using pump supplied seems very difficult Which just well since tank might blow up easy However pressure relief valve built system supposedly prevent pumping too much pressure relief valve should relied upon though since theres no assurance accuracy An easier comfortable pressurecharging system may used such foot pedal T-handled old-fashioned type bi cycle automotive air pump uses bracket bottom foot hold pump steady stroke up down An air pressure gauge such Continued page 192 Bill Effin gee * sayso PIes o Psttstn Sets give yoa meorted degigu yes W5Ot have selected hest clossic designs 11 tints tnt yoc choose hoe Th patterns tot port ste sn important enclusic testate One-ThIrd Scale Piper Tn-Pacer PA-22J 115-21e-- wise span eq wing ersa 3t cld engine Fe 45 oh sIC so 12th. 01-110 overall InsetS RC3g-3$2010 inth20zvn 1/3 Scale Piper Cub 1-3 119 wise spas eneth 2100 en wine ste. 4 oh SIC 20-ag old engisas 0C292$2910 Ducted Fans Navy F4D1 Skyray 114 e eseth 48% wtn4 span Ig h SIC tattthle Landise Gear 9CDF203110 1 noel 5 44 length 23ii wIne span is SIC 29th SIC IIK725 fans SCOFi$1910 Quarter Scale WV/I SE-5A $0Awing span 2220sq wing area 78 22 engines RCI3S7 6 SPAD CXIII 7$/s wing span sq Capohlo $yw 4 captures imagination RCQS-$ 0 FOKKER DR-i TRIPLANE e73 wing spans 1772 en wing area 78 tel 50 engines RCQS-ti 6 N SOPWITH CAMEL F1 $4 wing span e 21 50 sq wing areas 11 win S/C wnnd ta hale consoconion over 05 sq ft drawings $COS1 1 6 past Romanians tally 21111 Rounding out rest final stand ings Japan fourth Finland fifth France sixth United Kingdom seventh Federal Republic Germany eighth Switzerland ninth Eleven flights over 40 minutes re corded flown Americans Bob Ran dolph six feat may rank some sort unofficial record World Championships competition Jim Richmond three Cezar Banks two Rene Rutty sixth-place finisher Switzer land missed magic 40 mark mere seven seconds second flight day touched down 3953 Following two-hour break rest refurbishment contestants officials interested spectators awards banquet held Sheraton Hotel capped presentation medals trophies top three individuals Rich mond Banks Randolph teams United States Canada Romania story would complete further mention Romanian team Aurel Moraru Vasile Nicoara Aureal Popa concern generosity Oakland Cloud Duster Bud Romak scrappy East European trio would have meet price airline ticket alone two-thirds nual salaries explained Romak prevented former government coming 88 championships got telegram month ago saying could come didnt have financial backing trip So became sponsor Romak has friend mentor pa tron Eastern European Indoor fliers since first met 1966 World Championships Hungary using straw motor sticks hair bracing virtually no access modeling supplies know left models won individ ual championship Lew Gitlow Indoor Model Supply donated wood other sup plies 68 championships Ever since days treat like brother try treat same way Romak lives California met Romanians New York drove Johnson City predicted would sure third possibly second indeed finished third less ter minute behind second-place C nadian team Theyre really special concluded Compressed Air/Worth Continued page 92 pump good idea can actual pressure its being pumped pumps equipped gauges available stores like K-Mart Wal-Mar etc can attached line separate pressure limiter setting adjustment produce beep desired pressure reached also able Getting back basics simply use pump provided give 50 60 want performance rt quires pressure suggestion get better pump use some means reading pressure can won up about 90 lb difference perforni ance significant Initial flights Jonathan indoors large Mini-Dome Eastern Tennesse State University during Indoor Ni tional Championships last June height buildings interior t bottom girders 116 ft ground floor area 420 208 ft plus other 100 ft side seats Jonathan easily got about 80 ft height about 50-ft-dia circles takin about 40 seconds get high other 30 gradually circle down smooth landing About 80 pump stroke roughly 80 lb initial pressure deli ered performance amounts proximately foot altitude per pum stroke impression 90 IC strokes Jonathan would have reached alt tude least 100 ft Performance out box fine f small-field outdoor flying football field 192 Model Aviation 1/4 Scale Pokksr 0-ViII 10 wingspan sq wing atea 9025 cid engine 35 cli hs $COSh 5 Golden Age 1/4 Scale Curtiss Hewk P-i $8 length span 5 2210 sq iv wing ares 13 23 engines li 9/C SCOS-id 6 1/4 Scale Curds Falcon $3 length wing span 0 sq iv wing area4ch$IC$COSt3$2$96 Psonding MnwhrA$ c Icr cemplete ploen sub ansencry & $210 ehipeins waitIng sshni New ireftvdehlO cc yvrc fitet 04511 WE TECHNICAL Rt iBox29OOASanteRoss0..FL THE GLOWPLUG DESIGNED FOR Pu/s mc e s/ ng n engine LONGER LIFE4 HIGHER RPMSII I OCTOBER 18-21 1990 OHARE EXPO BOOTH -tiK #1267 MAKE THE GLOBEE / INDY CONNECTION Twinn-K Inc 10296 W Washington St Indianapolis IN 46231 Telephone 317-839-6579FAX 317-839-8928 No666 Blitz$1075 RC Sportster spans 48 uses hot 28/32 power Two plan shts No 667 AT-6$575 CL Semiscale Profile Stunter 35/40 power spans 47 No 668 Slow Worm$500 FF AMA Class competition plane 09/15 power spans 54 No 193Stiletto CL Stunt model McDonald winner 1970 1980 1982 FAI World Champs$3 75 No 262Craehmaater CL Cr000-proof trainer two sizes1S30 35/40 power $125 No 3101930 Fleet Biplane AC Sport Scale 35140 4-channel Wingspan 56 in. /s scale two sheets. S625 No 314Drake II RC Ken willards flying boat 3-channel 15-power Fly land removable gear$375 No 328Taylor Cub AC Don StalIn Schoolyard-Scale 049s 2-3 channel Spans 50 inS350 No 332Zephyr AC Small 2-channel glider hand-launch tow thermal slope touring$200 No 366Laaer 200 RC Spurt Scale replica championship Aerohetic flier Unes 40 pOwer 4-5 channel Two sheetoS1075 No 447112A Mirn America RC DId-Timer Texaco model 049 glow 2-channels$650 No 460440 AC Shoulder-wing sport flier 4-cycle 40-size engine 4 channels5650 No 465Blue Max Ii AC Fun-fly tyortuter 40-sloe engines spans 52 Lightweight struclare5700 No 533Ceaana C-37 RC Schoolyard Scale famous 30s plane 040/10 power 2-ch spoon 42 in$500 No 539Smelter Slow-Motion 15 AC Toilleso flying wing 15 engines spans 60 uses 3-ch ACS350 No 569Elecitroatreale AC Electric aerohatic plane spans 44 uaes 05 motorS550 No 572TR-260 AC Sport Scale Aerobatic plane 4-nt rohe 60/65 power spans 66 inS1100 No 576Serendlpilyl ndoor EZB record-holder spans 170R in$325 No 578Schweizer I-26B AC Quarter-scale Sailplane spans 125 Two plan sheets$1475 No 561Gee See Model Y AC Golden Age Aacer spans 72 C/s scale 60 power Three plan sheets$1175 No 566Snapdragon AC Fun-flylspurtoter fnr 25/30 engines spans 45 in$600 No 588MarIsh AC Slope-Snoring Sailplane spans 41 uses 2 AC channels$425 No 593Taylororett AC Sport Scale lightplane huilds utandard 2-placer clipped-wing air shnw stunter Spans either 70 58/a 30/40 two-otroke 40140 loor-ntmnke engine Two plan sheets no documentatinn$1000 No 598Coronet 150 AC-Assist Old-Timer enlarged lSOqh spans 72 uses 40-sloe 4-strskel30-size 2-strokeS650 No 601NIcitel AC Sportoter engine 3 AC channels Spans 44 in$500 No 603Span-ow Hawk P-30 FF Competition rubber-power plane won 87 Nuts Spans 30 inS225 No 607Curtiu Seagull AC giant Scale biplane spans 00 uses Quadral2enoah power Three plan sheets no docS2400 No 609Taperwing AC Pylon Ascer spuno 29/a Plan plus parts template sheetS600 No 610Protobype AC Sport biplane spans 40 uses 45/2-cycle 60/4-cycle powerS650 No 619Keith RIder R4 FF Scale Oniden Age racer robber power spans 18 in$300 No 620Gimlet 40 AC Sport/Pattem plane spans 60 4W50 engine 2 sheetsS1100 No 623ilendereon Longater AC Quarter-scale 1033 fliover spans 90/a 4-stroke 40/46 engine 3 plus sht no docS1650 No 624Keleher Lark AC Guarter-scole homeboilt spans 69 60/90 4-strnke power 2 plan sheets no risc$1100 No 626Sweepee AC Spnrt/Puttem cunards fsrward-swept wing spans 64 usen 40 power 2 plan sheets51300 No 626PrIme Cut AC Sport/Aerobafic plane spans 90 uses Quadra 35/40-size pswer Twe plan sheetsS1300 No 630OrIginal Fly Baby AC Old-Timer noons 72 uses 19I2S 2-cycle 40 4-cycle power 2 plan sheets51150 No 636The Gambler FF Indoor Onstunian robber-power cabin plane spans 15% in5200 No 638Keytwo AC Tri-geared low-wing spnrtster tsr 20/2S pnwer spans 44 inS575 No 638Owl Racer CL Scale Ascer fnr 040 power opano 20 inS225 No 639Skyvolt AC Tri-geared Electric aerebatic sportoter fur 05115 power spans 50 in5050 No 641LII Ole Reliable AC Old-Timer sport flier spans bOa/u engines$575 No 642BIpe 69 CL Partial plan updates deBoits 48 oemion 35cc power Spans 22/ in5225 No 644Bellanca Columbia AC Schoolyard Scule 2 AC channels engine Wingspan 46 in$575 No 645Lalrd Solution CL Profile Scale biplane spans 36 25/35 power$575 No 646Winter Hawk FF Aubber-power Coupe riHmner competitiun plane spans 47 in$375 No 647Cox SpecIal CL Semiscale biplane engine spans 24 in$300 No 648Curtlee OC2 FF Srullo Outdoor Gas Flying Scale biplane uses electric power spans 24 HiLine Mini-6 motorS325 No 649Thingamabob AC/CL Muhimode trainer 25 gun 00 electric power spans SiloS475 No 66347/66 RC Special AC Aerebatic nport plane 40 power spans 6110 3 plan sheetsS1075 No 651Coneortlum AC 6usd-Launch Hi-Start Glider spans 60 in5650 No 652Oar Fledarmaua AC Low-wing sport plane 20125 power spans 55 in5675 No 553Avantl CL Prohie Sport Scale cunard bioliner twin 049s spans 00 in$575 No 654Tamecat AC Truiner/sportater styled like F14 spans 66 40161 power Four plan sheets$1525 No 655Aetroatar FF AMA Cluso A/B Gas plane spans 67 in. ones 325/350cc power$800 No 856XFI3C CL Fraitle 15 Carrier plane spans 27/e in$550 No 657Super SquIre AC Trainer 35/40 2-otreke 53 4-strnke power upans 561/a In$750 No 688Shurlken Streak CL Trainer uses 2-line Monoline contrel spans 17 power5225 No 659Boone Box FF Wukefield Aubber competition plane spans 54 in$400 No 660Volkaplane AC Electric-powered aportoter 05 motor spans 56 2 plan shts$925 No 661Embry-Omatic FF Embryo Endurance rubber-power plane spanu 20 inS200 No 662Boxkite CL Scale antique canard pusher biplane spuns 42 2 plun uheeto51100 No 663Pea Patch AC Spnrtster spans 60 in, usen 40150 4-utreke power 2 plan ohentoS900 No 664Stuka Stunt CL Stuoter semiscule spans 3714 inS500 No 665Coneclentious Objector FF Mulvihill Aubber competition plane spans 50 Oat$575 0 03 0 O cj risC1 0 CO 00 0 00 no ico oE 200 Cfl Os0 O -o 00 Cog 00 C 0 - 0 - 00 00 0050 00 0 C 53 CD tO 0 00 v193262310314326332386447 000o -460465533539569572576578 CeO O-~ 581586588593598601603607 eDo&2609610619620623624626628 83ZZO630635636638639641642644 0 000to645646647648649650651652 O 0653654655656657658659660 662663664665666667668 -Co Plan price includes first Class postage US delivery Air Mail over 300 miles rders non-US address e add $250 Air Mail osta e handlin Make Check money order payable US funds drawn US bank ModelAviation AMA 1810 Samuel Morse Or, Reston VA 22090 Please allow 3 6 weeks delivery .Jno Please print carefully Enclosed $ _________________________ Os Ec NAME ___________________________________________ AMA No _______________ GE STREET Os wCITY TEZIP_ I--I Circle numbers of plans wish order best handling please include re-I quests payment some other service plans order II II II II II II I______ I___________________ II big enough isnt surrounded tall trees model weighs about 46 ouncet ready fly sufficiently heavy tC make out-of-sight flights unlikely thus nC dethermalizer appears necessary all-balsa wing tail assembly plus heavier necessary tail boom leave considerable room performanct improvement Using built-up wing tai construction would allow builder crease lifting surface area half much again double ex pected result would major performanc increase might well call addi tion dethermalizer other hand model withoL modification rugged easily repaired simply fun fly Itll give flight afte flight much risk flying away Fc fly small fields ait plane lets enjoy Free Flight complications higher performanc competition-type ship Compressed air-powered model flying clean quiet just enough motc buzz sound pleasant indicat power output Jonathan design mo ified simple means joining th wing halves flying disassembly fc carrying fits box 27 long 7 ir wide 3 deep including supplie hand pump disassembly model compact easily carried car Its wing span just under three feet makes easy have always handy car fo stopping flying schoolyards sport fields Jonathan compressed air-powere model practical fun opens up whole new world simple clean quit power Although created sold toy its also well-engineered exceller model design likely will rival chal lenge CO2 Electric power se larger radio-controlled versions come Availability present severely limited can quickly change deman grows Currently two sources manufacturer Z Models Via Solfc rino #1 31020 Frescada Treviso Italy English importer Mega Models Lar caster House Benpinck St Farnwort Bolton BL4 7EP England Fax 204-792 922 cost England 38 pounds abou $61 US complete package 25 pounds about $41 US motor pressure bottle alone Extra cost air ma shipment quotedthese prices ir dude postage mailing England As went press news arrived tht compressed air motor pioneer Bert Pooi associate Tom Nallen will ha motor/model combination sale US Write Bert 128 Warren Te race Longmeadow MA 01106 Introdut tory prices Package complete moto model $6795 plus $550 postage ar handling Package B motor prop tank $4495 plus $350 p&h Package motor prop $2795 plus $275 p&h 194 Model Aviation
Edition: Model Aviation - 1990/10
Page Numbers: 91, 92, 192, 194
V/o aM Compressed Air Power FORGET WHAT YOU may have previ ously read beard about compressed air model airplane power source Com pressed air motors no longer antique ex cept choose keep past alive building flying types popular Twenties early Thir ties Today new technology developed aly Paolo Zanin incidentally also produces pulse jet engines has produced modern compressed air motor pressure tank literally revolutionizing cat egory power new motor named Tiquattro MM3 Z Models Zanins company small 04 cu light 42 grams 15 oz soft-drink-type transparent plastic tank comes motor weighs 16 oz balsa tail boom has 28 oz liquid volume motor plastic well fact cylinder transparent can see parts piston crankshaft connecting rod poppet valve etc working mo tor runs Sidelight connecting rod directly connected crankshafton up stroke ball end rod centers itself bottom piston conical downstroke piston stops travel ing compressed air exhausts connecting rod keeps going down Top picture graceful well-proportIoned lines Jonathan model contribute its good performance characteristics pressure tank exceedingly strong easily damaged Kit model construction combination balsa plastic Left colorful box encloses revolutionary Jonathan compressed air motor/model produced Z Models Italy emblem box proclaims Ecological Air Propulsion since air used power no pollution air noise kit also contains small bicycle-type hand pump Right shot kit components wing halves have already joined Thats real construction necessary ARF almost ready-to-fly model tail sections simply slip boom slots Pump up tank supplied pump model ready fly October 1990 91 Left The fuselage tail boomlwing mount comes already glued soft plastic pressure tank motor mountlcowllng slips over front clear plastic tank taped place wings rubberbanded mount Right pressure tank little different com mon soft drink bottle suggesting larger bottle could substituted order achieve longer motor runs pressure relief valve built pressure tank cap no special fittings required fit plastic fuel-line-type tubing between motor tank Left The plastic tubing kit-supplied hand pump simply plugs filler valve cowling Approximately 80 pump strokes adequate pressurize tank Adding pressure becomes very difficult pump making overpressurizing unlikelyan herent safety factor avoids possibility bursting tank motor completely transparent making moving parts visible Right easier pressurizing automotive-type foot pump gauge may substituted particular gauge reads 100 psi de vice air line right emits audible signal preset pressure reached good idea especially no pressure gauge used up again Thus internal drag pis ton reduceda neat trick avoid wast ing power through unnecessary friction motor materials have selected avoid lubrication problems no lubri cation required Since fuel com pressed air moving parts operating clean atmosphere compatible Also motor-fuel combination cause high temperatures no significant heat problem can occur Helping situation relatively low motor speedtypically about 4000 rpm highest initial power Operation similar CO2 carbon diox ide icing problem Noise low actually pleasant-soundingmore like loud purr Starting instantaneous flip C02 once tank pressur ized No motor adjustment necessary rpm determined tank pressure greater initial pressure higher initial rpm Note chart rpm vs time initial pressure Basically useful power run about i mm 20 sec can ex pected initial charge 80 lb per sq inch varying 4000 1600 rpm fire up compressed air motor first step pressurize tank Using bicycle-type air pump pressure built up proportion number strokes plastic bicycle-type hand pump provided Jonathan package num ber strokes good measure what expectvery roughly pound pres sure per pump stroke other words 50 strokes provides about RPM Running Starting 80 lb RPM 4400 4000 3600 3200 2800 2400 2000 1600 1200 800 Time Plot Pressure --IL 20406080100 Seconds 92 Model Aviation 50 lb pressure ample early test flights Between 60 70 strokes pro vides enough extra pressure make ma jor difference power Its hard supplied hand pump can reach 80 90 strokes very hard pump ing further increase pressure will yield additional major gain motor per formance tank labeled caution sign saying maximum pressure seven bars equates about 100 lb per sq 7 x 147 lb atmospheric pressure may possible achieve 100 lb using pump supplied seems very difficult Which just well since tank might blow up easy However pressure relief valve built system supposedly prevent pumping too much pressure relief valve should relied upon though since theres no assurance accuracy An easier comfortable pressurecharging system may used such foot pedal T-handled old-fashioned type bi cycle automotive air pump uses bracket bottom foot hold pump steady stroke up down An air pressure gauge such Continued page 192 Bill Effin gee * sayso PIes o Psttstn Sets give yoa meorted degigu yes W5Ot have selected hest clossic designs 11 tints tnt yoc choose hoe Th patterns tot port ste sn important enclusic testate One-ThIrd Scale Piper Tn-Pacer PA-22J 115-21e-- wise span eq wing ersa 3t cld engine Fe 45 oh sIC so 12th. 01-110 overall InsetS RC3g-3$2010 inth20zvn 1/3 Scale Piper Cub 1-3 119 wise spas eneth 2100 en wine ste. 4 oh SIC 20-ag old engisas 0C292$2910 Ducted Fans Navy F4D1 Skyray 114 e eseth 48% wtn4 span Ig h SIC tattthle Landise Gear 9CDF203110 1 noel 5 44 length 23ii wIne span is SIC 29th SIC IIK725 fans SCOFi$1910 Quarter Scale WV/I SE-5A $0Awing span 2220sq wing area 78 22 engines RCI3S7 6 SPAD CXIII 7$/s wing span sq Capohlo $yw 4 captures imagination RCQS-$ 0 FOKKER DR-i TRIPLANE e73 wing spans 1772 en wing area 78 tel 50 engines RCQS-ti 6 N SOPWITH CAMEL F1 $4 wing span e 21 50 sq wing areas 11 win S/C wnnd ta hale consoconion over 05 sq ft drawings $COS1 1 6 past Romanians tally 21111 Rounding out rest final stand ings Japan fourth Finland fifth France sixth United Kingdom seventh Federal Republic Germany eighth Switzerland ninth Eleven flights over 40 minutes re corded flown Americans Bob Ran dolph six feat may rank some sort unofficial record World Championships competition Jim Richmond three Cezar Banks two Rene Rutty sixth-place finisher Switzer land missed magic 40 mark mere seven seconds second flight day touched down 3953 Following two-hour break rest refurbishment contestants officials interested spectators awards banquet held Sheraton Hotel capped presentation medals trophies top three individuals Rich mond Banks Randolph teams United States Canada Romania story would complete further mention Romanian team Aurel Moraru Vasile Nicoara Aureal Popa concern generosity Oakland Cloud Duster Bud Romak scrappy East European trio would have meet price airline ticket alone two-thirds nual salaries explained Romak prevented former government coming 88 championships got telegram month ago saying could come didnt have financial backing trip So became sponsor Romak has friend mentor pa tron Eastern European Indoor fliers since first met 1966 World Championships Hungary using straw motor sticks hair bracing virtually no access modeling supplies know left models won individ ual championship Lew Gitlow Indoor Model Supply donated wood other sup plies 68 championships Ever since days treat like brother try treat same way Romak lives California met Romanians New York drove Johnson City predicted would sure third possibly second indeed finished third less ter minute behind second-place C nadian team Theyre really special concluded Compressed Air/Worth Continued page 92 pump good idea can actual pressure its being pumped pumps equipped gauges available stores like K-Mart Wal-Mar etc can attached line separate pressure limiter setting adjustment produce beep desired pressure reached also able Getting back basics simply use pump provided give 50 60 want performance rt quires pressure suggestion get better pump use some means reading pressure can won up about 90 lb difference perforni ance significant Initial flights Jonathan indoors large Mini-Dome Eastern Tennesse State University during Indoor Ni tional Championships last June height buildings interior t bottom girders 116 ft ground floor area 420 208 ft plus other 100 ft side seats Jonathan easily got about 80 ft height about 50-ft-dia circles takin about 40 seconds get high other 30 gradually circle down smooth landing About 80 pump stroke roughly 80 lb initial pressure deli ered performance amounts proximately foot altitude per pum stroke impression 90 IC strokes Jonathan would have reached alt tude least 100 ft Performance out box fine f small-field outdoor flying football field 192 Model Aviation 1/4 Scale Pokksr 0-ViII 10 wingspan sq wing atea 9025 cid engine 35 cli hs $COSh 5 Golden Age 1/4 Scale Curtiss Hewk P-i $8 length span 5 2210 sq iv wing ares 13 23 engines li 9/C SCOS-id 6 1/4 Scale Curds Falcon $3 length wing span 0 sq iv wing area4ch$IC$COSt3$2$96 Psonding MnwhrA$ c Icr cemplete ploen sub ansencry & $210 ehipeins waitIng sshni New ireftvdehlO cc yvrc fitet 04511 WE TECHNICAL Rt iBox29OOASanteRoss0..FL THE GLOWPLUG DESIGNED FOR Pu/s mc e s/ ng n engine LONGER LIFE4 HIGHER RPMSII I OCTOBER 18-21 1990 OHARE EXPO BOOTH -tiK #1267 MAKE THE GLOBEE / INDY CONNECTION Twinn-K Inc 10296 W Washington St Indianapolis IN 46231 Telephone 317-839-6579FAX 317-839-8928 No666 Blitz$1075 RC Sportster spans 48 uses hot 28/32 power Two plan shts No 667 AT-6$575 CL Semiscale Profile Stunter 35/40 power spans 47 No 668 Slow Worm$500 FF AMA Class competition plane 09/15 power spans 54 No 193Stiletto CL Stunt model McDonald winner 1970 1980 1982 FAI World Champs$3 75 No 262Craehmaater CL Cr000-proof trainer two sizes1S30 35/40 power $125 No 3101930 Fleet Biplane AC Sport Scale 35140 4-channel Wingspan 56 in. /s scale two sheets. S625 No 314Drake II RC Ken willards flying boat 3-channel 15-power Fly land removable gear$375 No 328Taylor Cub AC Don StalIn Schoolyard-Scale 049s 2-3 channel Spans 50 inS350 No 332Zephyr AC Small 2-channel glider hand-launch tow thermal slope touring$200 No 366Laaer 200 RC Spurt Scale replica championship Aerohetic flier Unes 40 pOwer 4-5 channel Two sheetoS1075 No 447112A Mirn America RC DId-Timer Texaco model 049 glow 2-channels$650 No 460440 AC Shoulder-wing sport flier 4-cycle 40-size engine 4 channels5650 No 465Blue Max Ii AC Fun-fly tyortuter 40-sloe engines spans 52 Lightweight struclare5700 No 533Ceaana C-37 RC Schoolyard Scale famous 30s plane 040/10 power 2-ch spoon 42 in$500 No 539Smelter Slow-Motion 15 AC Toilleso flying wing 15 engines spans 60 uses 3-ch ACS350 No 569Elecitroatreale AC Electric aerohatic plane spans 44 uaes 05 motorS550 No 572TR-260 AC Sport Scale Aerobatic plane 4-nt rohe 60/65 power spans 66 inS1100 No 576Serendlpilyl ndoor EZB record-holder spans 170R in$325 No 578Schweizer I-26B AC Quarter-scale Sailplane spans 125 Two plan sheets$1475 No 561Gee See Model Y AC Golden Age Aacer spans 72 C/s scale 60 power Three plan sheets$1175 No 566Snapdragon AC Fun-flylspurtoter fnr 25/30 engines spans 45 in$600 No 588MarIsh AC Slope-Snoring Sailplane spans 41 uses 2 AC channels$425 No 593Taylororett AC Sport Scale lightplane huilds utandard 2-placer clipped-wing air shnw stunter Spans either 70 58/a 30/40 two-otroke 40140 loor-ntmnke engine Two plan sheets no documentatinn$1000 No 598Coronet 150 AC-Assist Old-Timer enlarged lSOqh spans 72 uses 40-sloe 4-strskel30-size 2-strokeS650 No 601NIcitel AC Sportoter engine 3 AC channels Spans 44 in$500 No 603Span-ow Hawk P-30 FF Competition rubber-power plane won 87 Nuts Spans 30 inS225 No 607Curtiu Seagull AC giant Scale biplane spans 00 uses Quadral2enoah power Three plan sheets no docS2400 No 609Taperwing AC Pylon Ascer spuno 29/a Plan plus parts template sheetS600 No 610Protobype AC Sport biplane spans 40 uses 45/2-cycle 60/4-cycle powerS650 No 619Keith RIder R4 FF Scale Oniden Age racer robber power spans 18 in$300 No 620Gimlet 40 AC Sport/Pattem plane spans 60 4W50 engine 2 sheetsS1100 No 623ilendereon Longater AC Quarter-scale 1033 fliover spans 90/a 4-stroke 40/46 engine 3 plus sht no docS1650 No 624Keleher Lark AC Guarter-scole homeboilt spans 69 60/90 4-strnke power 2 plan sheets no risc$1100 No 626Sweepee AC Spnrt/Puttem cunards fsrward-swept wing spans 64 usen 40 power 2 plan sheets51300 No 626PrIme Cut AC Sport/Aerobafic plane spans 90 uses Quadra 35/40-size pswer Twe plan sheetsS1300 No 630OrIginal Fly Baby AC Old-Timer noons 72 uses 19I2S 2-cycle 40 4-cycle power 2 plan sheets51150 No 636The Gambler FF Indoor Onstunian robber-power cabin plane spans 15% in5200 No 638Keytwo AC Tri-geared low-wing spnrtster tsr 20/2S pnwer spans 44 inS575 No 638Owl Racer CL Scale Ascer fnr 040 power opano 20 inS225 No 639Skyvolt AC Tri-geared Electric aerebatic sportoter fur 05115 power spans 50 in5050 No 641LII Ole Reliable AC Old-Timer sport flier spans bOa/u engines$575 No 642BIpe 69 CL Partial plan updates deBoits 48 oemion 35cc power Spans 22/ in5225 No 644Bellanca Columbia AC Schoolyard Scule 2 AC channels engine Wingspan 46 in$575 No 645Lalrd Solution CL Profile Scale biplane spans 36 25/35 power$575 No 646Winter Hawk FF Aubber-power Coupe riHmner competitiun plane spans 47 in$375 No 647Cox SpecIal CL Semiscale biplane engine spans 24 in$300 No 648Curtlee OC2 FF Srullo Outdoor Gas Flying Scale biplane uses electric power spans 24 HiLine Mini-6 motorS325 No 649Thingamabob AC/CL Muhimode trainer 25 gun 00 electric power spans SiloS475 No 66347/66 RC Special AC Aerebatic nport plane 40 power spans 6110 3 plan sheetsS1075 No 651Coneortlum AC 6usd-Launch Hi-Start Glider spans 60 in5650 No 652Oar Fledarmaua AC Low-wing sport plane 20125 power spans 55 in5675 No 553Avantl CL Prohie Sport Scale cunard bioliner twin 049s spans 00 in$575 No 654Tamecat AC Truiner/sportater styled like F14 spans 66 40161 power Four plan sheets$1525 No 655Aetroatar FF AMA Cluso A/B Gas plane spans 67 in. ones 325/350cc power$800 No 856XFI3C CL Fraitle 15 Carrier plane spans 27/e in$550 No 657Super SquIre AC Trainer 35/40 2-otreke 53 4-strnke power upans 561/a In$750 No 688Shurlken Streak CL Trainer uses 2-line Monoline contrel spans 17 power5225 No 659Boone Box FF Wukefield Aubber competition plane spans 54 in$400 No 660Volkaplane AC Electric-powered aportoter 05 motor spans 56 2 plan shts$925 No 661Embry-Omatic FF Embryo Endurance rubber-power plane spanu 20 inS200 No 662Boxkite CL Scale antique canard pusher biplane spuns 42 2 plun uheeto51100 No 663Pea Patch AC Spnrtster spans 60 in, usen 40150 4-utreke power 2 plan ohentoS900 No 664Stuka Stunt CL Stuoter semiscule spans 3714 inS500 No 665Coneclentious Objector FF Mulvihill Aubber competition plane spans 50 Oat$575 0 03 0 O cj risC1 0 CO 00 0 00 no ico oE 200 Cfl Os0 O -o 00 Cog 00 C 0 - 0 - 00 00 0050 00 0 C 53 CD tO 0 00 v193262310314326332386447 000o -460465533539569572576578 CeO O-~ 581586588593598601603607 eDo&2609610619620623624626628 83ZZO630635636638639641642644 0 000to645646647648649650651652 O 0653654655656657658659660 662663664665666667668 -Co Plan price includes first Class postage US delivery Air Mail over 300 miles rders non-US address e add $250 Air Mail osta e handlin Make Check money order payable US funds drawn US bank ModelAviation AMA 1810 Samuel Morse Or, Reston VA 22090 Please allow 3 6 weeks delivery .Jno Please print carefully Enclosed $ _________________________ Os Ec NAME ___________________________________________ AMA No _______________ GE STREET Os wCITY TEZIP_ I--I Circle numbers of plans wish order best handling please include re-I quests payment some other service plans order II II II II II II I______ I___________________ II big enough isnt surrounded tall trees model weighs about 46 ouncet ready fly sufficiently heavy tC make out-of-sight flights unlikely thus nC dethermalizer appears necessary all-balsa wing tail assembly plus heavier necessary tail boom leave considerable room performanct improvement Using built-up wing tai construction would allow builder crease lifting surface area half much again double ex pected result would major performanc increase might well call addi tion dethermalizer other hand model withoL modification rugged easily repaired simply fun fly Itll give flight afte flight much risk flying away Fc fly small fields ait plane lets enjoy Free Flight complications higher performanc competition-type ship Compressed air-powered model flying clean quiet just enough motc buzz sound pleasant indicat power output Jonathan design mo ified simple means joining th wing halves flying disassembly fc carrying fits box 27 long 7 ir wide 3 deep including supplie hand pump disassembly model compact easily carried car Its wing span just under three feet makes easy have always handy car fo stopping flying schoolyards sport fields Jonathan compressed air-powere model practical fun opens up whole new world simple clean quit power Although created sold toy its also well-engineered exceller model design likely will rival chal lenge CO2 Electric power se larger radio-controlled versions come Availability present severely limited can quickly change deman grows Currently two sources manufacturer Z Models Via Solfc rino #1 31020 Frescada Treviso Italy English importer Mega Models Lar caster House Benpinck St Farnwort Bolton BL4 7EP England Fax 204-792 922 cost England 38 pounds abou $61 US complete package 25 pounds about $41 US motor pressure bottle alone Extra cost air ma shipment quotedthese prices ir dude postage mailing England As went press news arrived tht compressed air motor pioneer Bert Pooi associate Tom Nallen will ha motor/model combination sale US Write Bert 128 Warren Te race Longmeadow MA 01106 Introdut tory prices Package complete moto model $6795 plus $550 postage ar handling Package B motor prop tank $4495 plus $350 p&h Package motor prop $2795 plus $275 p&h 194 Model Aviation
