Free Flight Duration BarnabyWainfan THINGS WEIRD enjoyable great satisfaction getting Free Flight model fly well old saying models beautiful high overhead sun shining through tissue model overhead unconventional just plain weird adds some extra spice experience challenge unusual models part attraction feeling achievement make new strange airplane fly second attraction unconventional potential improvements performance Remember breakthrough model led conventional designs fly now radical innovation first appeared Small modifications conventional practice will lead small changes performance Radical ex periments can lead either dramatic improve ments equally dramatic failures know have share both successes make failures worthwhile final attraction strange model design what Detroit refers eway appeal large part fun weird models conversations spark pride having something unlike other model field flying flying wing sweptforward-winged canard some other unusual airplane very easy pick model out gaggle overhead Boston Cabin event has inspired large number unusual models Boston Cabin West 1 4-gram Boston Boston models small enough quick enough build no great loss experiment fails also interesting event compare configura tions since models equal major areas affect performance have same span aspect ratio wing loading Dave Ganzer Hawthorne Slying wing model recent Black Sheep meet reminiscent Marion Baker Delta Kitten home-built early Sixties earlier Lippisch DM-1 experimental glider Photo Tony Naccarato Ligetti Stratos interesting Austra lian home-built seen Oshkosh 1986 Its example boxplane configuration theoretically has lower Induced drag other configuration same span vertical gap between wings Lynne Wainfan working Seeker Hawthorne model Mile Square Park Fountain Valley CA typifies simple effective models can bulitto Haw thorne Flying Wing rules Joined-wing ROG model built Dr Julian Wolkovitch Seventies test joined-wing concept may ancestorof whole generation advanced manned aircraft Photo Dr Julian Woikovitch 58 Model Aviation IMINARY DILL HANNAN EAPPROA MATE SLOT corporate Bearing Concept sketches joined-wing ROG models Bill Hannan simple stick version No1 has built flies well joined wing offers structural aerodynamic advantages over conventional configurations Theres column Ferrel Papics interesting rhombal-wing doortailless model bulitto Hawthorne rules propeller blades made laminated drafting Mylar pushes interpreta tion plastic-propeller rule bit Teepee tandem-winged P-30 model B Wainfan design built byAl Hieger Tandemwinged models very stable have lower induced drag monoplanes lithe wings separated vertically frontal area rubber length propeller diam eter model has obvious performance advantage over pack something unique its configuration giving its extra per formance Boston models have appeared high wings low wings manner tail surfaces including V inverted V canards pusher propellers other interesting configuration features Some weirdies quite competitive conventional high-wing tail-aft models Configuration innovation things gives Boston its charm feel major argument against introduction ap pearance points event Appearance judging has its place Scale competition stated objective Boston Cabin duration within set rules governing configuration appearance points awarded will tend stifle innovation builder unconven tional model taking risk Appearance highly subjective thing appearance judges think model ugly can very well lose contests flies longerthan its competition feel should happen Duration event Appearance judging would increase time effort required build competitive air plane since time would have spent detailing finishing model well good Scale models AMA already has plenty Scale events rule book people want build pretty models have judged appearance extra construction time volved would make less attractive try something new different because extra effort would lost experiment proved failure addition appearance points Boston Cabin rules would convert fun-and-innovative Duration event sort Free Flight Standoff Scale event Hawthorne flying wing Indoor event devised Burbank-based Black Sheep club flown southern California area Briefly stated rules follows 1 The model must have tail canard other horizontal stabilizing surface ie flying wings 2 Biplanes permitted both wings have same planform no stagger incidence difference between wings 3 The model must weigh 14 grams rubber 4 The model must use commercially-avail able plastic propeller Propeller modification ie sanding trimming balancing etc permitted 5 The model its flying configuration propeller place must fit cube measuring 18 x 18 x 18 inches Hawthorne Flying Wing models easy quick build amazing number different configurations have appeared Black Sheep Flightmasters meets Hawthorne models turning times approaching two minutes under 26-foot ceiling usually rugged enough flown outdoors tend jo thermal well because low wing loadings Models originally built indoor Hawthorne contests have won outdoor annual Northrop Flying Wing Contest several times recent years Flying wing tailless models hold particular fascination have some theoretical advantages over conventional models some practical advantages well thing partic ularly like elimination need build warp-prone tail surfaces simplest solution problem building good straight tailplane build Flying wing models can quite competitive certain events primary advantage can built lower wing loading equivalent-weight conventional model since weight wetted area tail conventional model can part wing tailless model events wing area wing loading 600 SWEPT TIP Optimum wing shapes suggested CP VanDam Raked tips can reduce wings induceddrag upto 15% The6O-swepttipis much easierto build elliptical wing can efficient regulated flying wing can very effective example P-30 wing area restricted although mini mum-weight rule own Cyrano P-30 pub lished construction article December 1986 issue magazine has successful contest career flying against conventional models wing area restricted rules wing loading set combination minimum weight/maximum wing area rules flying wing disadvantage since cannot develop high lift coefficient tail-aft design highly-cambered wing time AMA rule Free Flight General section rule book stated something effect flying wing model s area would counted purposes maximum-wing-area rules allow flying wing have same total area conventional model 50% stab Continued page 154 March 1987 59 Wright Flier built Dick Baxter cruising nearthe ceiling model spans about 14 really cleverly-disguised A-frame twin-pusher flies quite well Simple cute sport models likethisgivea lotof enjoyment relativley little time effort spent building Tony Naccarato atthe recent Northrop Flying Wing contest twln-049-powered scale Northrop B-35 infamous Rodan elec tric modelwhich typifies Its monstrous namesake terrifying Its builder com petition alike Plc Mary Lou Naccarato Larry Kruse profile scale Beech Starship rubber model atthe 1984 Reno Nats Profile Scale becoming quite popular because models build quickly also great way test new configuration before put ting effort build properly detailed 3D version Warner photo Tomy Timer/Dunlop Continued page 146 keep fuel off it wont slow down unless gets really messy happens take apart clean al cohol get ready go again ndoor/Tenny Continued page 57 largest film hoop hope fill reason properly-poured film needs room spread naturally Cramped pouring space causes either very uneven film color artificially thick unstable sheet film Film has its spreading artificially limited poor risk use models Part problem pouring microfilm maintain good control amount microfilm solution deposited water second photo microfilm saga series shows shortcut problem Uniform distribution solution has two elements rate fluid flow rate distribution Rate distribution requires sweep arm across tank rate pouring spout photo has set interchangeable different-sized orifices plan match orifice required pouring rate always use same orifice hatch film solution free learn uniform pouring motion Be sure keep nozzle uniformly close water prevent splash because splash makes bubbles create holes film sheet Here another film technique makes easier get good sheets film storage boxes traditional method attaching film hoop lap film over edge hoop much better way coat film side hoop rubber cement Let rubber cement solvents evaporate leaving tacky film hoop pressed down onto poured film adheres well enough film outside hoop can torn away can lift film immediately Also need lift smaller hoops pour normal-sized sheet put small hoops sheet will fit Tear loose lift normally Just precaution process tearing film around hoops may leave small scraps film water arent cleaned off may attach other sheets spoil otherwise good film One microfilm hint storage boxes last photos shows store lot film small area Hoops made fit closely half inch clearance end inside chosen storage box Use tapered blocks attached inside box sides back create self-centering slots will hold hoops cant touch other tapered blocks important contact hoops corners film hoop never touched Instead hoops held securely wedged between tapered blocks box construction gives safe reliable storage indefinite time uter users looks like more computer users out com puters often useful model design prob lems have developed program compute print out dimensions prop blocks ac cording formula published previous column January 1987 issue $1 will send listings Radio Shack Color Computer Model 100 lap top Commodore 64 Send request address given below Tenny PO Box 545 Richardson TX 75080 uration/Wainfan Continued page 59 Current mles count stab area below 50% wing area wing area n-area rule no longer rule book have able find out history rule am certain deleted because being used rather because flying wings winning too much out can give information history rule deleted still exists has inadvertently omitted rule book please contact ed wings An unconventional configuration receiving considerable interest real-airplane world lately joined wing joined-wing airplane has two wings joined tips form diamond shape rear wing root mounted fin front wing attached fuselage wings form diamond front view well top view wing tips same level behind other joined tip body end plate The joined wing invented Dr Julian Wolkovitch holds patent concept joined wing has two attractive advantages first wings brace TErebail RIC Idle-Bar Glow Plugs Long Short$1 89 Also . Traditional line non-idle bar Glow Plugs Six Types 3 Heat Ranges High Performance Glow Element Blow Proof Seal Only $149 Swanson Associates PO Box 151 Wayne NJ e A4 07470ff/j Model Aviation wodris starter system starts The worlds integrated system starter parts accessories gets off superior start Hi-Tork Dynatron The Hi-Tork Starter worlds powerful standard starteI Hi-Tork features several innova tive safety features including patented hand guard keep hands away propeller starter switch located below handgrip help prevent accidental starts The heavy-duty Dynatron Starter delivers one-third maximum power 12 volts closest competitor 47-69% torque standard 12- volt starters greater output Dynatron can used 24 volts Equipped patented safety guard Dynatron backed full two-year warranty against manufacturing defects Both outstanding starters made USA compatible other Sullivan products exemplify dedication high quality technol ogy Youll find Sullivan starters accessories dealer near Get off safe trouble-free start time Sullivan Determined leading independent testing labaratoiy JUCTS nof4v oar overhead Cectflcpodiflr tiMeS OneNonhHavenSeir PO Box5 66Ba MD21224301732-3500 other giving airplane light rigid structure second joined wing has higher span efficiency lower induced drag conventional airplane same span The aerodynamics joined wing require somewhat careful design conventional airplane because interaction between two wings particular critical get twist distribution wings right Dr Wolkovitch suggests following incidence settings used front wing root 30 both tips 00 rear wing root settings incidence decreasing steadily move front vehicle rear joined-wing configuration seems to natural Easy B weight critical wire bracing allowed Bill Hannan has built flying simple joined-wing ROG model Lets hope Billwill share experiences configuration rest us soon induced-drag configurations airplane flying its minimum sinking speed large portion its drag induced drag Conse quently modelers advantage have high span efficiency possible particularly true span-limited events such Pennyplane P-30 classical ap proach reducing induced drag increasing wingspan allowed severai unconventional configurations offer some potential increase span efficiency gain some reduction induced drag increase span 1 Biplanes tandem wings given span lift equai-span biplane nonzero vertical gap has lower induced drag monoplane same span Indoor fliers have exploiting some time Pennyplane outdoor biplanes tandems rare tandem-wing configuration just biplane lot stagger wings separated vertically well horizontally will have same high span-efficiency biplane proper ly-designed tandem very stable has canard- like stall resistance 2 Boxplanes Classical aerodynamic theory states lowest-induced-drag lifting system given wingspan biplane end plates connecting wing tips form rectangular box Wind tunnel tests Lockheed early Seventies showed theory correct induced drag reductions up 40% possible reaiistic boxplane configurations When designing boxplane designer must trade off induced drag reduction produced end plates against parasite drag caused wetted area optimum end plate chord about 30% 40% wing chord trailing edge end plate should trailing edge wings memory serves correctly Hank Cole has considerable recent success Pennyplane biplane boxplane-type tip plates 3 Swept wing tips Recent papers CP van Dam SAE Society Automotive Engi neers AIAA American Institute Aero nautics Astronautics literature have sug gested induced drag wing can reduced sweeping leading edge outer 15% 25 % wing 600 tapering tip Theoretically awing type tip can have span efficiency greater 10 other words awing properly-raked tips can efficient pure elliptical wing Van Dam aiso suggests optimum shape wing tip elliptical leading edge shape coming point trailing edge March 1987 155 PUIGIN AIWTA3LI STAD UT last can optimize Stab ricidence tor best tight characteristics pair glass tilled air adjusters ncluoed pto4ide fc micro screw udjustmerit smaller frost tube Main tube aluminum matching pheriolic socket $495 WING 1131 & SOViETS Alutrinsmnt ulloytubergtorplug-inwitr Included pair special slip-ht pheistlic sockets build wing snucture Now size models 7/9 dis 2$895 11/ dia 5 2$ 995 154 dia s 3$1495 NEWI WING MOUNUNG SET wing mocntlng n1mstem deneloped ton Chidgey 54 fm teat accurate stays tight Thece Iryloc oradiets screws machined wing blocks included $595 prosactarden em sedbytaan Kr5tense o acca atety measa e ero e enator sadder trow alter beg essworkosu 0 55w mngoatanarpaacArgaa Ilitno ninpete wth ustructarts og boaliasdcmrlang $795 Designs es VGA Designs e VGA Designs se VGA Designs es VGA Designs e C * DARNED GOOD AIRMEN C Lightest weight Pilots Available *FULL BODY PILOT KIT L e keVny am ubberpa ts Easy assemble tirrish Kit contain5 Pilot head hands boots helmet cap goggles toll templates easy lirutrontions FUSSy positionabte too.0 Height- Weight- NEW Low Prices- No 206 Scale ll7t 2 oz 1 No205 15 Scale l4ra oz5aO No20* 1/4 Scale 173s 4oz gp IS k/V ItNO203 1/3 Scale 23s 6ozsI6R51 SPORTSMAN OARNSTORMER- FULL BOOn na SUST St C *BUST PILOT KIT Llei4in ninni iiinarninbe paniQ Kit senrains Punt 5034 Seiiiiei unndcap qnuaies una Jackel. loauunwiitr ann fiisn .S PHeight- Weight- Low Fl-ieee5 No 1W SSnjiiri-ina ant55n5at Os~-Ns 105- t Stscnioa-asi-rants695c ID199 No Ion-i 45caie a3n i-i act5 72S*some No itO Scale 534 Pr nutu1455simple Insewingg IrequiredQ 74V5 standing l-OOlj5n- .nOt attainable pleotics.. 0 O o.o iiieii ecirenie iOnS eeiOnr nn oanipininn mu unnin 01 pint S 0 5n5i5 nuii Sane ullie ur nn ellect Sir Se Sui-uico 51 anna airnuali nd 5100 fOr Catalog IS St InC New Veik Staso Reoaeits ania 75 saleS 500 SearS shock MO.bOOsAllo 3 weeks Inn check clear St VGA Designs eo VGA Designs GATE shown sketch George Perryman has using tip shape years Great Speckled Everythings Apparently George way ahead rest us am flying P-30 using swept tips seems very well It interesting note optimum wing shape suggested van Dam looks lot like fins tails sharks dolphins other fast- swimming sea creatures goal design win contests rather eat avoid being eaten tends become highly optimized after million years le non-competition sport models Small simple pure sport models give back fun less cost effort just about anything Free Flight little jewels very unusual configuration great attractions duration contest- winning performance cease important pure fun substituted kinds strange things result classic example type model Bill Hannans immortal Stringless Wonder Most ofus Free Flight have built least some us myself included Stringless Wonder first successful Free Flight model Some greatest fun have Free Flight has flying small strange rubber- powered models always nice have reliable knockabout model collection new supermodel bad mood crashes can always pull out old faithful put few flights restore faith Another class pure sport model great fun what call whirlythings Ceiling Walkers Hannans Unicopter come Im mediately mind small rotating gadgets easy quick throw together can flown very little space also have great virtue rarely ever go QOS newcomers thats out-of-sighteditor flown outdoors features make ideal first models Juniors arejust starting out usually have least model box go Indoor session find great way involve curious Junior-age spectator hobby first time cal suggestion risk provoking cries Heresy would like suggest ideal sport Free Flight model low wing loading low lift-to-drag ratio other words machine has glide somewhere between dropped feather tumbleweed such model built light can have pretty good climb spite its poor L/D isa little overpowered can have great climb combination exciting rapid climb steepbut slowglide gives modeler airplane slot fun does require either large field dethermalizer time since some thermals will denied fly In Fifties Roy Cloughusedto specialize type model produced pub lished some things strange boggle mind including sort lifting- body device looked like cross between blimp Buck Rogers spaceship recent Charybdis 020-powered whirligig Macutcheon another such enjoyable strange ness Low-LID sport models well worth trying lot fun dont have chase too far Barnaby Wainfan 2503 Hardwick St Lake- wood CA 90712 responding advertisers mention read about ModelAviation 156 Model Aviation GATOR Makes Winner 11613 TAIL 45 IIAIX ALL MLSA UT An new Tiger Tail 120 four strokes piped 60 two strokes beautiful performer competition just showing off balso kit machined wood parts complete hardware package includes plug-in ad justable stab parts new wing mounts Wing Span -72 Wing Area -860 sq Complete Deluu Kit$15995 CASE An inoipensrne rcgged molded case protect tnat mipensive transmaten Foe ooth two st ck ann s ngle St Ok transmitters trown earner gin n won mnum tr mann locking case $1895 See Dealer Order Direct Include 51 50 Per Item UPS R R/C PRODUCTS 37t3Porriparo brine ebensacola FL 32514 Ptioiie 904 476-8639 S Engines Atlanta Kits Challenge IV Kits Hattori Pipes / Headers Tettra Wheels / Hardware PO Box 388914-248-8603 Linoondale NY 10540 HIGH PERFORMANCE FLAP ii 0 act albona FASTER & SAFER Z ape r SIre og L Igh t s e 1515 1ZZ Slow tots hot etanea docile landing Sutritiojeg perlgrmaacel Use oith elect saulplsseg-ectlnateo throtl lageistI Switch esrool Fuily adjustable tit 85y entoil tor CaSa installollon Readybaril comes complete silt restractlons 55 50 iDOeroka Seed tor FREE Slotture Deal Inquiries levilad u14e dadw Montana Lawrence Ks 66044
Edition: Model Aviation - 1987/03
Page Numbers: 58, 59, 154, 155, 156
Free Flight Duration BarnabyWainfan THINGS WEIRD enjoyable great satisfaction getting Free Flight model fly well old saying models beautiful high overhead sun shining through tissue model overhead unconventional just plain weird adds some extra spice experience challenge unusual models part attraction feeling achievement make new strange airplane fly second attraction unconventional potential improvements performance Remember breakthrough model led conventional designs fly now radical innovation first appeared Small modifications conventional practice will lead small changes performance Radical ex periments can lead either dramatic improve ments equally dramatic failures know have share both successes make failures worthwhile final attraction strange model design what Detroit refers eway appeal large part fun weird models conversations spark pride having something unlike other model field flying flying wing sweptforward-winged canard some other unusual airplane very easy pick model out gaggle overhead Boston Cabin event has inspired large number unusual models Boston Cabin West 1 4-gram Boston Boston models small enough quick enough build no great loss experiment fails also interesting event compare configura tions since models equal major areas affect performance have same span aspect ratio wing loading Dave Ganzer Hawthorne Slying wing model recent Black Sheep meet reminiscent Marion Baker Delta Kitten home-built early Sixties earlier Lippisch DM-1 experimental glider Photo Tony Naccarato Ligetti Stratos interesting Austra lian home-built seen Oshkosh 1986 Its example boxplane configuration theoretically has lower Induced drag other configuration same span vertical gap between wings Lynne Wainfan working Seeker Hawthorne model Mile Square Park Fountain Valley CA typifies simple effective models can bulitto Haw thorne Flying Wing rules Joined-wing ROG model built Dr Julian Wolkovitch Seventies test joined-wing concept may ancestorof whole generation advanced manned aircraft Photo Dr Julian Woikovitch 58 Model Aviation IMINARY DILL HANNAN EAPPROA MATE SLOT corporate Bearing Concept sketches joined-wing ROG models Bill Hannan simple stick version No1 has built flies well joined wing offers structural aerodynamic advantages over conventional configurations Theres column Ferrel Papics interesting rhombal-wing doortailless model bulitto Hawthorne rules propeller blades made laminated drafting Mylar pushes interpreta tion plastic-propeller rule bit Teepee tandem-winged P-30 model B Wainfan design built byAl Hieger Tandemwinged models very stable have lower induced drag monoplanes lithe wings separated vertically frontal area rubber length propeller diam eter model has obvious performance advantage over pack something unique its configuration giving its extra per formance Boston models have appeared high wings low wings manner tail surfaces including V inverted V canards pusher propellers other interesting configuration features Some weirdies quite competitive conventional high-wing tail-aft models Configuration innovation things gives Boston its charm feel major argument against introduction ap pearance points event Appearance judging has its place Scale competition stated objective Boston Cabin duration within set rules governing configuration appearance points awarded will tend stifle innovation builder unconven tional model taking risk Appearance highly subjective thing appearance judges think model ugly can very well lose contests flies longerthan its competition feel should happen Duration event Appearance judging would increase time effort required build competitive air plane since time would have spent detailing finishing model well good Scale models AMA already has plenty Scale events rule book people want build pretty models have judged appearance extra construction time volved would make less attractive try something new different because extra effort would lost experiment proved failure addition appearance points Boston Cabin rules would convert fun-and-innovative Duration event sort Free Flight Standoff Scale event Hawthorne flying wing Indoor event devised Burbank-based Black Sheep club flown southern California area Briefly stated rules follows 1 The model must have tail canard other horizontal stabilizing surface ie flying wings 2 Biplanes permitted both wings have same planform no stagger incidence difference between wings 3 The model must weigh 14 grams rubber 4 The model must use commercially-avail able plastic propeller Propeller modification ie sanding trimming balancing etc permitted 5 The model its flying configuration propeller place must fit cube measuring 18 x 18 x 18 inches Hawthorne Flying Wing models easy quick build amazing number different configurations have appeared Black Sheep Flightmasters meets Hawthorne models turning times approaching two minutes under 26-foot ceiling usually rugged enough flown outdoors tend jo thermal well because low wing loadings Models originally built indoor Hawthorne contests have won outdoor annual Northrop Flying Wing Contest several times recent years Flying wing tailless models hold particular fascination have some theoretical advantages over conventional models some practical advantages well thing partic ularly like elimination need build warp-prone tail surfaces simplest solution problem building good straight tailplane build Flying wing models can quite competitive certain events primary advantage can built lower wing loading equivalent-weight conventional model since weight wetted area tail conventional model can part wing tailless model events wing area wing loading 600 SWEPT TIP Optimum wing shapes suggested CP VanDam Raked tips can reduce wings induceddrag upto 15% The6O-swepttipis much easierto build elliptical wing can efficient regulated flying wing can very effective example P-30 wing area restricted although mini mum-weight rule own Cyrano P-30 pub lished construction article December 1986 issue magazine has successful contest career flying against conventional models wing area restricted rules wing loading set combination minimum weight/maximum wing area rules flying wing disadvantage since cannot develop high lift coefficient tail-aft design highly-cambered wing time AMA rule Free Flight General section rule book stated something effect flying wing model s area would counted purposes maximum-wing-area rules allow flying wing have same total area conventional model 50% stab Continued page 154 March 1987 59 Wright Flier built Dick Baxter cruising nearthe ceiling model spans about 14 really cleverly-disguised A-frame twin-pusher flies quite well Simple cute sport models likethisgivea lotof enjoyment relativley little time effort spent building Tony Naccarato atthe recent Northrop Flying Wing contest twln-049-powered scale Northrop B-35 infamous Rodan elec tric modelwhich typifies Its monstrous namesake terrifying Its builder com petition alike Plc Mary Lou Naccarato Larry Kruse profile scale Beech Starship rubber model atthe 1984 Reno Nats Profile Scale becoming quite popular because models build quickly also great way test new configuration before put ting effort build properly detailed 3D version Warner photo Tomy Timer/Dunlop Continued page 146 keep fuel off it wont slow down unless gets really messy happens take apart clean al cohol get ready go again ndoor/Tenny Continued page 57 largest film hoop hope fill reason properly-poured film needs room spread naturally Cramped pouring space causes either very uneven film color artificially thick unstable sheet film Film has its spreading artificially limited poor risk use models Part problem pouring microfilm maintain good control amount microfilm solution deposited water second photo microfilm saga series shows shortcut problem Uniform distribution solution has two elements rate fluid flow rate distribution Rate distribution requires sweep arm across tank rate pouring spout photo has set interchangeable different-sized orifices plan match orifice required pouring rate always use same orifice hatch film solution free learn uniform pouring motion Be sure keep nozzle uniformly close water prevent splash because splash makes bubbles create holes film sheet Here another film technique makes easier get good sheets film storage boxes traditional method attaching film hoop lap film over edge hoop much better way coat film side hoop rubber cement Let rubber cement solvents evaporate leaving tacky film hoop pressed down onto poured film adheres well enough film outside hoop can torn away can lift film immediately Also need lift smaller hoops pour normal-sized sheet put small hoops sheet will fit Tear loose lift normally Just precaution process tearing film around hoops may leave small scraps film water arent cleaned off may attach other sheets spoil otherwise good film One microfilm hint storage boxes last photos shows store lot film small area Hoops made fit closely half inch clearance end inside chosen storage box Use tapered blocks attached inside box sides back create self-centering slots will hold hoops cant touch other tapered blocks important contact hoops corners film hoop never touched Instead hoops held securely wedged between tapered blocks box construction gives safe reliable storage indefinite time uter users looks like more computer users out com puters often useful model design prob lems have developed program compute print out dimensions prop blocks ac cording formula published previous column January 1987 issue $1 will send listings Radio Shack Color Computer Model 100 lap top Commodore 64 Send request address given below Tenny PO Box 545 Richardson TX 75080 uration/Wainfan Continued page 59 Current mles count stab area below 50% wing area wing area n-area rule no longer rule book have able find out history rule am certain deleted because being used rather because flying wings winning too much out can give information history rule deleted still exists has inadvertently omitted rule book please contact ed wings An unconventional configuration receiving considerable interest real-airplane world lately joined wing joined-wing airplane has two wings joined tips form diamond shape rear wing root mounted fin front wing attached fuselage wings form diamond front view well top view wing tips same level behind other joined tip body end plate The joined wing invented Dr Julian Wolkovitch holds patent concept joined wing has two attractive advantages first wings brace TErebail RIC Idle-Bar Glow Plugs Long Short$1 89 Also . Traditional line non-idle bar Glow Plugs Six Types 3 Heat Ranges High Performance Glow Element Blow Proof Seal Only $149 Swanson Associates PO Box 151 Wayne NJ e A4 07470ff/j Model Aviation wodris starter system starts The worlds integrated system starter parts accessories gets off superior start Hi-Tork Dynatron The Hi-Tork Starter worlds powerful standard starteI Hi-Tork features several innova tive safety features including patented hand guard keep hands away propeller starter switch located below handgrip help prevent accidental starts The heavy-duty Dynatron Starter delivers one-third maximum power 12 volts closest competitor 47-69% torque standard 12- volt starters greater output Dynatron can used 24 volts Equipped patented safety guard Dynatron backed full two-year warranty against manufacturing defects Both outstanding starters made USA compatible other Sullivan products exemplify dedication high quality technol ogy Youll find Sullivan starters accessories dealer near Get off safe trouble-free start time Sullivan Determined leading independent testing labaratoiy JUCTS nof4v oar overhead Cectflcpodiflr tiMeS OneNonhHavenSeir PO Box5 66Ba MD21224301732-3500 other giving airplane light rigid structure second joined wing has higher span efficiency lower induced drag conventional airplane same span The aerodynamics joined wing require somewhat careful design conventional airplane because interaction between two wings particular critical get twist distribution wings right Dr Wolkovitch suggests following incidence settings used front wing root 30 both tips 00 rear wing root settings incidence decreasing steadily move front vehicle rear joined-wing configuration seems to natural Easy B weight critical wire bracing allowed Bill Hannan has built flying simple joined-wing ROG model Lets hope Billwill share experiences configuration rest us soon induced-drag configurations airplane flying its minimum sinking speed large portion its drag induced drag Conse quently modelers advantage have high span efficiency possible particularly true span-limited events such Pennyplane P-30 classical ap proach reducing induced drag increasing wingspan allowed severai unconventional configurations offer some potential increase span efficiency gain some reduction induced drag increase span 1 Biplanes tandem wings given span lift equai-span biplane nonzero vertical gap has lower induced drag monoplane same span Indoor fliers have exploiting some time Pennyplane outdoor biplanes tandems rare tandem-wing configuration just biplane lot stagger wings separated vertically well horizontally will have same high span-efficiency biplane proper ly-designed tandem very stable has canard- like stall resistance 2 Boxplanes Classical aerodynamic theory states lowest-induced-drag lifting system given wingspan biplane end plates connecting wing tips form rectangular box Wind tunnel tests Lockheed early Seventies showed theory correct induced drag reductions up 40% possible reaiistic boxplane configurations When designing boxplane designer must trade off induced drag reduction produced end plates against parasite drag caused wetted area optimum end plate chord about 30% 40% wing chord trailing edge end plate should trailing edge wings memory serves correctly Hank Cole has considerable recent success Pennyplane biplane boxplane-type tip plates 3 Swept wing tips Recent papers CP van Dam SAE Society Automotive Engi neers AIAA American Institute Aero nautics Astronautics literature have sug gested induced drag wing can reduced sweeping leading edge outer 15% 25 % wing 600 tapering tip Theoretically awing type tip can have span efficiency greater 10 other words awing properly-raked tips can efficient pure elliptical wing Van Dam aiso suggests optimum shape wing tip elliptical leading edge shape coming point trailing edge March 1987 155 PUIGIN AIWTA3LI STAD UT last can optimize Stab ricidence tor best tight characteristics pair glass tilled air adjusters ncluoed pto4ide fc micro screw udjustmerit smaller frost tube Main tube aluminum matching pheriolic socket $495 WING 1131 & SOViETS Alutrinsmnt ulloytubergtorplug-inwitr Included pair special slip-ht pheistlic sockets build wing snucture Now size models 7/9 dis 2$895 11/ dia 5 2$ 995 154 dia s 3$1495 NEWI WING MOUNUNG SET wing mocntlng n1mstem deneloped ton Chidgey 54 fm teat accurate stays tight Thece Iryloc oradiets screws machined wing blocks included $595 prosactarden em sedbytaan Kr5tense o acca atety measa e ero e enator sadder trow alter beg essworkosu 0 55w mngoatanarpaacArgaa Ilitno ninpete wth ustructarts og boaliasdcmrlang $795 Designs es VGA Designs e VGA Designs se VGA Designs es VGA Designs e C * DARNED GOOD AIRMEN C Lightest weight Pilots Available *FULL BODY PILOT KIT L e keVny am ubberpa ts Easy assemble tirrish Kit contain5 Pilot head hands boots helmet cap goggles toll templates easy lirutrontions FUSSy positionabte too.0 Height- Weight- NEW Low Prices- No 206 Scale ll7t 2 oz 1 No205 15 Scale l4ra oz5aO No20* 1/4 Scale 173s 4oz gp IS k/V ItNO203 1/3 Scale 23s 6ozsI6R51 SPORTSMAN OARNSTORMER- FULL BOOn na SUST St C *BUST PILOT KIT Llei4in ninni iiinarninbe paniQ Kit senrains Punt 5034 Seiiiiei unndcap qnuaies una Jackel. loauunwiitr ann fiisn .S PHeight- Weight- Low Fl-ieee5 No 1W SSnjiiri-ina ant55n5at Os~-Ns 105- t Stscnioa-asi-rants695c ID199 No Ion-i 45caie a3n i-i act5 72S*some No itO Scale 534 Pr nutu1455simple Insewingg IrequiredQ 74V5 standing l-OOlj5n- .nOt attainable pleotics.. 0 O o.o iiieii ecirenie iOnS eeiOnr nn oanipininn mu unnin 01 pint S 0 5n5i5 nuii Sane ullie ur nn ellect Sir Se Sui-uico 51 anna airnuali nd 5100 fOr Catalog IS St InC New Veik Staso Reoaeits ania 75 saleS 500 SearS shock MO.bOOsAllo 3 weeks Inn check clear St VGA Designs eo VGA Designs GATE shown sketch George Perryman has using tip shape years Great Speckled Everythings Apparently George way ahead rest us am flying P-30 using swept tips seems very well It interesting note optimum wing shape suggested van Dam looks lot like fins tails sharks dolphins other fast- swimming sea creatures goal design win contests rather eat avoid being eaten tends become highly optimized after million years le non-competition sport models Small simple pure sport models give back fun less cost effort just about anything Free Flight little jewels very unusual configuration great attractions duration contest- winning performance cease important pure fun substituted kinds strange things result classic example type model Bill Hannans immortal Stringless Wonder Most ofus Free Flight have built least some us myself included Stringless Wonder first successful Free Flight model Some greatest fun have Free Flight has flying small strange rubber- powered models always nice have reliable knockabout model collection new supermodel bad mood crashes can always pull out old faithful put few flights restore faith Another class pure sport model great fun what call whirlythings Ceiling Walkers Hannans Unicopter come Im mediately mind small rotating gadgets easy quick throw together can flown very little space also have great virtue rarely ever go QOS newcomers thats out-of-sighteditor flown outdoors features make ideal first models Juniors arejust starting out usually have least model box go Indoor session find great way involve curious Junior-age spectator hobby first time cal suggestion risk provoking cries Heresy would like suggest ideal sport Free Flight model low wing loading low lift-to-drag ratio other words machine has glide somewhere between dropped feather tumbleweed such model built light can have pretty good climb spite its poor L/D isa little overpowered can have great climb combination exciting rapid climb steepbut slowglide gives modeler airplane slot fun does require either large field dethermalizer time since some thermals will denied fly In Fifties Roy Cloughusedto specialize type model produced pub lished some things strange boggle mind including sort lifting- body device looked like cross between blimp Buck Rogers spaceship recent Charybdis 020-powered whirligig Macutcheon another such enjoyable strange ness Low-LID sport models well worth trying lot fun dont have chase too far Barnaby Wainfan 2503 Hardwick St Lake- wood CA 90712 responding advertisers mention read about ModelAviation 156 Model Aviation GATOR Makes Winner 11613 TAIL 45 IIAIX ALL MLSA UT An new Tiger Tail 120 four strokes piped 60 two strokes beautiful performer competition just showing off balso kit machined wood parts complete hardware package includes plug-in ad justable stab parts new wing mounts Wing Span -72 Wing Area -860 sq Complete Deluu Kit$15995 CASE An inoipensrne rcgged molded case protect tnat mipensive transmaten Foe ooth two st ck ann s ngle St Ok transmitters trown earner gin n won mnum tr mann locking case $1895 See Dealer Order Direct Include 51 50 Per Item UPS R R/C PRODUCTS 37t3Porriparo brine ebensacola FL 32514 Ptioiie 904 476-8639 S Engines Atlanta Kits Challenge IV Kits Hattori Pipes / Headers Tettra Wheels / Hardware PO Box 388914-248-8603 Linoondale NY 10540 HIGH PERFORMANCE FLAP ii 0 act albona FASTER & SAFER Z ape r SIre og L Igh t s e 1515 1ZZ Slow tots hot etanea docile landing Sutritiojeg perlgrmaacel Use oith elect saulplsseg-ectlnateo throtl lageistI Switch esrool Fuily adjustable tit 85y entoil tor CaSa installollon Readybaril comes complete silt restractlons 55 50 iDOeroka Seed tor FREE Slotture Deal Inquiries levilad u14e dadw Montana Lawrence Ks 66044
Edition: Model Aviation - 1987/03
Page Numbers: 58, 59, 154, 155, 156
Free Flight Duration BarnabyWainfan THINGS WEIRD enjoyable great satisfaction getting Free Flight model fly well old saying models beautiful high overhead sun shining through tissue model overhead unconventional just plain weird adds some extra spice experience challenge unusual models part attraction feeling achievement make new strange airplane fly second attraction unconventional potential improvements performance Remember breakthrough model led conventional designs fly now radical innovation first appeared Small modifications conventional practice will lead small changes performance Radical ex periments can lead either dramatic improve ments equally dramatic failures know have share both successes make failures worthwhile final attraction strange model design what Detroit refers eway appeal large part fun weird models conversations spark pride having something unlike other model field flying flying wing sweptforward-winged canard some other unusual airplane very easy pick model out gaggle overhead Boston Cabin event has inspired large number unusual models Boston Cabin West 1 4-gram Boston Boston models small enough quick enough build no great loss experiment fails also interesting event compare configura tions since models equal major areas affect performance have same span aspect ratio wing loading Dave Ganzer Hawthorne Slying wing model recent Black Sheep meet reminiscent Marion Baker Delta Kitten home-built early Sixties earlier Lippisch DM-1 experimental glider Photo Tony Naccarato Ligetti Stratos interesting Austra lian home-built seen Oshkosh 1986 Its example boxplane configuration theoretically has lower Induced drag other configuration same span vertical gap between wings Lynne Wainfan working Seeker Hawthorne model Mile Square Park Fountain Valley CA typifies simple effective models can bulitto Haw thorne Flying Wing rules Joined-wing ROG model built Dr Julian Wolkovitch Seventies test joined-wing concept may ancestorof whole generation advanced manned aircraft Photo Dr Julian Woikovitch 58 Model Aviation IMINARY DILL HANNAN EAPPROA MATE SLOT corporate Bearing Concept sketches joined-wing ROG models Bill Hannan simple stick version No1 has built flies well joined wing offers structural aerodynamic advantages over conventional configurations Theres column Ferrel Papics interesting rhombal-wing doortailless model bulitto Hawthorne rules propeller blades made laminated drafting Mylar pushes interpreta tion plastic-propeller rule bit Teepee tandem-winged P-30 model B Wainfan design built byAl Hieger Tandemwinged models very stable have lower induced drag monoplanes lithe wings separated vertically frontal area rubber length propeller diam eter model has obvious performance advantage over pack something unique its configuration giving its extra per formance Boston models have appeared high wings low wings manner tail surfaces including V inverted V canards pusher propellers other interesting configuration features Some weirdies quite competitive conventional high-wing tail-aft models Configuration innovation things gives Boston its charm feel major argument against introduction ap pearance points event Appearance judging has its place Scale competition stated objective Boston Cabin duration within set rules governing configuration appearance points awarded will tend stifle innovation builder unconven tional model taking risk Appearance highly subjective thing appearance judges think model ugly can very well lose contests flies longerthan its competition feel should happen Duration event Appearance judging would increase time effort required build competitive air plane since time would have spent detailing finishing model well good Scale models AMA already has plenty Scale events rule book people want build pretty models have judged appearance extra construction time volved would make less attractive try something new different because extra effort would lost experiment proved failure addition appearance points Boston Cabin rules would convert fun-and-innovative Duration event sort Free Flight Standoff Scale event Hawthorne flying wing Indoor event devised Burbank-based Black Sheep club flown southern California area Briefly stated rules follows 1 The model must have tail canard other horizontal stabilizing surface ie flying wings 2 Biplanes permitted both wings have same planform no stagger incidence difference between wings 3 The model must weigh 14 grams rubber 4 The model must use commercially-avail able plastic propeller Propeller modification ie sanding trimming balancing etc permitted 5 The model its flying configuration propeller place must fit cube measuring 18 x 18 x 18 inches Hawthorne Flying Wing models easy quick build amazing number different configurations have appeared Black Sheep Flightmasters meets Hawthorne models turning times approaching two minutes under 26-foot ceiling usually rugged enough flown outdoors tend jo thermal well because low wing loadings Models originally built indoor Hawthorne contests have won outdoor annual Northrop Flying Wing Contest several times recent years Flying wing tailless models hold particular fascination have some theoretical advantages over conventional models some practical advantages well thing partic ularly like elimination need build warp-prone tail surfaces simplest solution problem building good straight tailplane build Flying wing models can quite competitive certain events primary advantage can built lower wing loading equivalent-weight conventional model since weight wetted area tail conventional model can part wing tailless model events wing area wing loading 600 SWEPT TIP Optimum wing shapes suggested CP VanDam Raked tips can reduce wings induceddrag upto 15% The6O-swepttipis much easierto build elliptical wing can efficient regulated flying wing can very effective example P-30 wing area restricted although mini mum-weight rule own Cyrano P-30 pub lished construction article December 1986 issue magazine has successful contest career flying against conventional models wing area restricted rules wing loading set combination minimum weight/maximum wing area rules flying wing disadvantage since cannot develop high lift coefficient tail-aft design highly-cambered wing time AMA rule Free Flight General section rule book stated something effect flying wing model s area would counted purposes maximum-wing-area rules allow flying wing have same total area conventional model 50% stab Continued page 154 March 1987 59 Wright Flier built Dick Baxter cruising nearthe ceiling model spans about 14 really cleverly-disguised A-frame twin-pusher flies quite well Simple cute sport models likethisgivea lotof enjoyment relativley little time effort spent building Tony Naccarato atthe recent Northrop Flying Wing contest twln-049-powered scale Northrop B-35 infamous Rodan elec tric modelwhich typifies Its monstrous namesake terrifying Its builder com petition alike Plc Mary Lou Naccarato Larry Kruse profile scale Beech Starship rubber model atthe 1984 Reno Nats Profile Scale becoming quite popular because models build quickly also great way test new configuration before put ting effort build properly detailed 3D version Warner photo Tomy Timer/Dunlop Continued page 146 keep fuel off it wont slow down unless gets really messy happens take apart clean al cohol get ready go again ndoor/Tenny Continued page 57 largest film hoop hope fill reason properly-poured film needs room spread naturally Cramped pouring space causes either very uneven film color artificially thick unstable sheet film Film has its spreading artificially limited poor risk use models Part problem pouring microfilm maintain good control amount microfilm solution deposited water second photo microfilm saga series shows shortcut problem Uniform distribution solution has two elements rate fluid flow rate distribution Rate distribution requires sweep arm across tank rate pouring spout photo has set interchangeable different-sized orifices plan match orifice required pouring rate always use same orifice hatch film solution free learn uniform pouring motion Be sure keep nozzle uniformly close water prevent splash because splash makes bubbles create holes film sheet Here another film technique makes easier get good sheets film storage boxes traditional method attaching film hoop lap film over edge hoop much better way coat film side hoop rubber cement Let rubber cement solvents evaporate leaving tacky film hoop pressed down onto poured film adheres well enough film outside hoop can torn away can lift film immediately Also need lift smaller hoops pour normal-sized sheet put small hoops sheet will fit Tear loose lift normally Just precaution process tearing film around hoops may leave small scraps film water arent cleaned off may attach other sheets spoil otherwise good film One microfilm hint storage boxes last photos shows store lot film small area Hoops made fit closely half inch clearance end inside chosen storage box Use tapered blocks attached inside box sides back create self-centering slots will hold hoops cant touch other tapered blocks important contact hoops corners film hoop never touched Instead hoops held securely wedged between tapered blocks box construction gives safe reliable storage indefinite time uter users looks like more computer users out com puters often useful model design prob lems have developed program compute print out dimensions prop blocks ac cording formula published previous column January 1987 issue $1 will send listings Radio Shack Color Computer Model 100 lap top Commodore 64 Send request address given below Tenny PO Box 545 Richardson TX 75080 uration/Wainfan Continued page 59 Current mles count stab area below 50% wing area wing area n-area rule no longer rule book have able find out history rule am certain deleted because being used rather because flying wings winning too much out can give information history rule deleted still exists has inadvertently omitted rule book please contact ed wings An unconventional configuration receiving considerable interest real-airplane world lately joined wing joined-wing airplane has two wings joined tips form diamond shape rear wing root mounted fin front wing attached fuselage wings form diamond front view well top view wing tips same level behind other joined tip body end plate The joined wing invented Dr Julian Wolkovitch holds patent concept joined wing has two attractive advantages first wings brace TErebail RIC Idle-Bar Glow Plugs Long Short$1 89 Also . Traditional line non-idle bar Glow Plugs Six Types 3 Heat Ranges High Performance Glow Element Blow Proof Seal Only $149 Swanson Associates PO Box 151 Wayne NJ e A4 07470ff/j Model Aviation wodris starter system starts The worlds integrated system starter parts accessories gets off superior start Hi-Tork Dynatron The Hi-Tork Starter worlds powerful standard starteI Hi-Tork features several innova tive safety features including patented hand guard keep hands away propeller starter switch located below handgrip help prevent accidental starts The heavy-duty Dynatron Starter delivers one-third maximum power 12 volts closest competitor 47-69% torque standard 12- volt starters greater output Dynatron can used 24 volts Equipped patented safety guard Dynatron backed full two-year warranty against manufacturing defects Both outstanding starters made USA compatible other Sullivan products exemplify dedication high quality technol ogy Youll find Sullivan starters accessories dealer near Get off safe trouble-free start time Sullivan Determined leading independent testing labaratoiy JUCTS nof4v oar overhead Cectflcpodiflr tiMeS OneNonhHavenSeir PO Box5 66Ba MD21224301732-3500 other giving airplane light rigid structure second joined wing has higher span efficiency lower induced drag conventional airplane same span The aerodynamics joined wing require somewhat careful design conventional airplane because interaction between two wings particular critical get twist distribution wings right Dr Wolkovitch suggests following incidence settings used front wing root 30 both tips 00 rear wing root settings incidence decreasing steadily move front vehicle rear joined-wing configuration seems to natural Easy B weight critical wire bracing allowed Bill Hannan has built flying simple joined-wing ROG model Lets hope Billwill share experiences configuration rest us soon induced-drag configurations airplane flying its minimum sinking speed large portion its drag induced drag Conse quently modelers advantage have high span efficiency possible particularly true span-limited events such Pennyplane P-30 classical ap proach reducing induced drag increasing wingspan allowed severai unconventional configurations offer some potential increase span efficiency gain some reduction induced drag increase span 1 Biplanes tandem wings given span lift equai-span biplane nonzero vertical gap has lower induced drag monoplane same span Indoor fliers have exploiting some time Pennyplane outdoor biplanes tandems rare tandem-wing configuration just biplane lot stagger wings separated vertically well horizontally will have same high span-efficiency biplane proper ly-designed tandem very stable has canard- like stall resistance 2 Boxplanes Classical aerodynamic theory states lowest-induced-drag lifting system given wingspan biplane end plates connecting wing tips form rectangular box Wind tunnel tests Lockheed early Seventies showed theory correct induced drag reductions up 40% possible reaiistic boxplane configurations When designing boxplane designer must trade off induced drag reduction produced end plates against parasite drag caused wetted area optimum end plate chord about 30% 40% wing chord trailing edge end plate should trailing edge wings memory serves correctly Hank Cole has considerable recent success Pennyplane biplane boxplane-type tip plates 3 Swept wing tips Recent papers CP van Dam SAE Society Automotive Engi neers AIAA American Institute Aero nautics Astronautics literature have sug gested induced drag wing can reduced sweeping leading edge outer 15% 25 % wing 600 tapering tip Theoretically awing type tip can have span efficiency greater 10 other words awing properly-raked tips can efficient pure elliptical wing Van Dam aiso suggests optimum shape wing tip elliptical leading edge shape coming point trailing edge March 1987 155 PUIGIN AIWTA3LI STAD UT last can optimize Stab ricidence tor best tight characteristics pair glass tilled air adjusters ncluoed pto4ide fc micro screw udjustmerit smaller frost tube Main tube aluminum matching pheriolic socket $495 WING 1131 & SOViETS Alutrinsmnt ulloytubergtorplug-inwitr Included pair special slip-ht pheistlic sockets build wing snucture Now size models 7/9 dis 2$895 11/ dia 5 2$ 995 154 dia s 3$1495 NEWI WING MOUNUNG SET wing mocntlng n1mstem deneloped ton Chidgey 54 fm teat accurate stays tight Thece Iryloc oradiets screws machined wing blocks included $595 prosactarden em sedbytaan Kr5tense o acca atety measa e ero e enator sadder trow alter beg essworkosu 0 55w mngoatanarpaacArgaa Ilitno ninpete wth ustructarts og boaliasdcmrlang $795 Designs es VGA Designs e VGA Designs se VGA Designs es VGA Designs e C * DARNED GOOD AIRMEN C Lightest weight Pilots Available *FULL BODY PILOT KIT L e keVny am ubberpa ts Easy assemble tirrish Kit contain5 Pilot head hands boots helmet cap goggles toll templates easy lirutrontions FUSSy positionabte too.0 Height- Weight- NEW Low Prices- No 206 Scale ll7t 2 oz 1 No205 15 Scale l4ra oz5aO No20* 1/4 Scale 173s 4oz gp IS k/V ItNO203 1/3 Scale 23s 6ozsI6R51 SPORTSMAN OARNSTORMER- FULL BOOn na SUST St C *BUST PILOT KIT Llei4in ninni iiinarninbe paniQ Kit senrains Punt 5034 Seiiiiei unndcap qnuaies una Jackel. loauunwiitr ann fiisn .S PHeight- Weight- Low Fl-ieee5 No 1W SSnjiiri-ina ant55n5at Os~-Ns 105- t Stscnioa-asi-rants695c ID199 No Ion-i 45caie a3n i-i act5 72S*some No itO Scale 534 Pr nutu1455simple Insewingg IrequiredQ 74V5 standing l-OOlj5n- .nOt attainable pleotics.. 0 O o.o iiieii ecirenie iOnS eeiOnr nn oanipininn mu unnin 01 pint S 0 5n5i5 nuii Sane ullie ur nn ellect Sir Se Sui-uico 51 anna airnuali nd 5100 fOr Catalog IS St InC New Veik Staso Reoaeits ania 75 saleS 500 SearS shock MO.bOOsAllo 3 weeks Inn check clear St VGA Designs eo VGA Designs GATE shown sketch George Perryman has using tip shape years Great Speckled Everythings Apparently George way ahead rest us am flying P-30 using swept tips seems very well It interesting note optimum wing shape suggested van Dam looks lot like fins tails sharks dolphins other fast- swimming sea creatures goal design win contests rather eat avoid being eaten tends become highly optimized after million years le non-competition sport models Small simple pure sport models give back fun less cost effort just about anything Free Flight little jewels very unusual configuration great attractions duration contest- winning performance cease important pure fun substituted kinds strange things result classic example type model Bill Hannans immortal Stringless Wonder Most ofus Free Flight have built least some us myself included Stringless Wonder first successful Free Flight model Some greatest fun have Free Flight has flying small strange rubber- powered models always nice have reliable knockabout model collection new supermodel bad mood crashes can always pull out old faithful put few flights restore faith Another class pure sport model great fun what call whirlythings Ceiling Walkers Hannans Unicopter come Im mediately mind small rotating gadgets easy quick throw together can flown very little space also have great virtue rarely ever go QOS newcomers thats out-of-sighteditor flown outdoors features make ideal first models Juniors arejust starting out usually have least model box go Indoor session find great way involve curious Junior-age spectator hobby first time cal suggestion risk provoking cries Heresy would like suggest ideal sport Free Flight model low wing loading low lift-to-drag ratio other words machine has glide somewhere between dropped feather tumbleweed such model built light can have pretty good climb spite its poor L/D isa little overpowered can have great climb combination exciting rapid climb steepbut slowglide gives modeler airplane slot fun does require either large field dethermalizer time since some thermals will denied fly In Fifties Roy Cloughusedto specialize type model produced pub lished some things strange boggle mind including sort lifting- body device looked like cross between blimp Buck Rogers spaceship recent Charybdis 020-powered whirligig Macutcheon another such enjoyable strange ness Low-LID sport models well worth trying lot fun dont have chase too far Barnaby Wainfan 2503 Hardwick St Lake- wood CA 90712 responding advertisers mention read about ModelAviation 156 Model Aviation GATOR Makes Winner 11613 TAIL 45 IIAIX ALL MLSA UT An new Tiger Tail 120 four strokes piped 60 two strokes beautiful performer competition just showing off balso kit machined wood parts complete hardware package includes plug-in ad justable stab parts new wing mounts Wing Span -72 Wing Area -860 sq Complete Deluu Kit$15995 CASE An inoipensrne rcgged molded case protect tnat mipensive transmaten Foe ooth two st ck ann s ngle St Ok transmitters trown earner gin n won mnum tr mann locking case $1895 See Dealer Order Direct Include 51 50 Per Item UPS R R/C PRODUCTS 37t3Porriparo brine ebensacola FL 32514 Ptioiie 904 476-8639 S Engines Atlanta Kits Challenge IV Kits Hattori Pipes / Headers Tettra Wheels / Hardware PO Box 388914-248-8603 Linoondale NY 10540 HIGH PERFORMANCE FLAP ii 0 act albona FASTER & SAFER Z ape r SIre og L Igh t s e 1515 1ZZ Slow tots hot etanea docile landing Sutritiojeg perlgrmaacel Use oith elect saulplsseg-ectlnateo throtl lageistI Switch esrool Fuily adjustable tit 85y entoil tor CaSa installollon Readybaril comes complete silt restractlons 55 50 iDOeroka Seed tor FREE Slotture Deal Inquiries levilad u14e dadw Montana Lawrence Ks 66044
Edition: Model Aviation - 1987/03
Page Numbers: 58, 59, 154, 155, 156
Free Flight Duration BarnabyWainfan THINGS WEIRD enjoyable great satisfaction getting Free Flight model fly well old saying models beautiful high overhead sun shining through tissue model overhead unconventional just plain weird adds some extra spice experience challenge unusual models part attraction feeling achievement make new strange airplane fly second attraction unconventional potential improvements performance Remember breakthrough model led conventional designs fly now radical innovation first appeared Small modifications conventional practice will lead small changes performance Radical ex periments can lead either dramatic improve ments equally dramatic failures know have share both successes make failures worthwhile final attraction strange model design what Detroit refers eway appeal large part fun weird models conversations spark pride having something unlike other model field flying flying wing sweptforward-winged canard some other unusual airplane very easy pick model out gaggle overhead Boston Cabin event has inspired large number unusual models Boston Cabin West 1 4-gram Boston Boston models small enough quick enough build no great loss experiment fails also interesting event compare configura tions since models equal major areas affect performance have same span aspect ratio wing loading Dave Ganzer Hawthorne Slying wing model recent Black Sheep meet reminiscent Marion Baker Delta Kitten home-built early Sixties earlier Lippisch DM-1 experimental glider Photo Tony Naccarato Ligetti Stratos interesting Austra lian home-built seen Oshkosh 1986 Its example boxplane configuration theoretically has lower Induced drag other configuration same span vertical gap between wings Lynne Wainfan working Seeker Hawthorne model Mile Square Park Fountain Valley CA typifies simple effective models can bulitto Haw thorne Flying Wing rules Joined-wing ROG model built Dr Julian Wolkovitch Seventies test joined-wing concept may ancestorof whole generation advanced manned aircraft Photo Dr Julian Woikovitch 58 Model Aviation IMINARY DILL HANNAN EAPPROA MATE SLOT corporate Bearing Concept sketches joined-wing ROG models Bill Hannan simple stick version No1 has built flies well joined wing offers structural aerodynamic advantages over conventional configurations Theres column Ferrel Papics interesting rhombal-wing doortailless model bulitto Hawthorne rules propeller blades made laminated drafting Mylar pushes interpreta tion plastic-propeller rule bit Teepee tandem-winged P-30 model B Wainfan design built byAl Hieger Tandemwinged models very stable have lower induced drag monoplanes lithe wings separated vertically frontal area rubber length propeller diam eter model has obvious performance advantage over pack something unique its configuration giving its extra per formance Boston models have appeared high wings low wings manner tail surfaces including V inverted V canards pusher propellers other interesting configuration features Some weirdies quite competitive conventional high-wing tail-aft models Configuration innovation things gives Boston its charm feel major argument against introduction ap pearance points event Appearance judging has its place Scale competition stated objective Boston Cabin duration within set rules governing configuration appearance points awarded will tend stifle innovation builder unconven tional model taking risk Appearance highly subjective thing appearance judges think model ugly can very well lose contests flies longerthan its competition feel should happen Duration event Appearance judging would increase time effort required build competitive air plane since time would have spent detailing finishing model well good Scale models AMA already has plenty Scale events rule book people want build pretty models have judged appearance extra construction time volved would make less attractive try something new different because extra effort would lost experiment proved failure addition appearance points Boston Cabin rules would convert fun-and-innovative Duration event sort Free Flight Standoff Scale event Hawthorne flying wing Indoor event devised Burbank-based Black Sheep club flown southern California area Briefly stated rules follows 1 The model must have tail canard other horizontal stabilizing surface ie flying wings 2 Biplanes permitted both wings have same planform no stagger incidence difference between wings 3 The model must weigh 14 grams rubber 4 The model must use commercially-avail able plastic propeller Propeller modification ie sanding trimming balancing etc permitted 5 The model its flying configuration propeller place must fit cube measuring 18 x 18 x 18 inches Hawthorne Flying Wing models easy quick build amazing number different configurations have appeared Black Sheep Flightmasters meets Hawthorne models turning times approaching two minutes under 26-foot ceiling usually rugged enough flown outdoors tend jo thermal well because low wing loadings Models originally built indoor Hawthorne contests have won outdoor annual Northrop Flying Wing Contest several times recent years Flying wing tailless models hold particular fascination have some theoretical advantages over conventional models some practical advantages well thing partic ularly like elimination need build warp-prone tail surfaces simplest solution problem building good straight tailplane build Flying wing models can quite competitive certain events primary advantage can built lower wing loading equivalent-weight conventional model since weight wetted area tail conventional model can part wing tailless model events wing area wing loading 600 SWEPT TIP Optimum wing shapes suggested CP VanDam Raked tips can reduce wings induceddrag upto 15% The6O-swepttipis much easierto build elliptical wing can efficient regulated flying wing can very effective example P-30 wing area restricted although mini mum-weight rule own Cyrano P-30 pub lished construction article December 1986 issue magazine has successful contest career flying against conventional models wing area restricted rules wing loading set combination minimum weight/maximum wing area rules flying wing disadvantage since cannot develop high lift coefficient tail-aft design highly-cambered wing time AMA rule Free Flight General section rule book stated something effect flying wing model s area would counted purposes maximum-wing-area rules allow flying wing have same total area conventional model 50% stab Continued page 154 March 1987 59 Wright Flier built Dick Baxter cruising nearthe ceiling model spans about 14 really cleverly-disguised A-frame twin-pusher flies quite well Simple cute sport models likethisgivea lotof enjoyment relativley little time effort spent building Tony Naccarato atthe recent Northrop Flying Wing contest twln-049-powered scale Northrop B-35 infamous Rodan elec tric modelwhich typifies Its monstrous namesake terrifying Its builder com petition alike Plc Mary Lou Naccarato Larry Kruse profile scale Beech Starship rubber model atthe 1984 Reno Nats Profile Scale becoming quite popular because models build quickly also great way test new configuration before put ting effort build properly detailed 3D version Warner photo Tomy Timer/Dunlop Continued page 146 keep fuel off it wont slow down unless gets really messy happens take apart clean al cohol get ready go again ndoor/Tenny Continued page 57 largest film hoop hope fill reason properly-poured film needs room spread naturally Cramped pouring space causes either very uneven film color artificially thick unstable sheet film Film has its spreading artificially limited poor risk use models Part problem pouring microfilm maintain good control amount microfilm solution deposited water second photo microfilm saga series shows shortcut problem Uniform distribution solution has two elements rate fluid flow rate distribution Rate distribution requires sweep arm across tank rate pouring spout photo has set interchangeable different-sized orifices plan match orifice required pouring rate always use same orifice hatch film solution free learn uniform pouring motion Be sure keep nozzle uniformly close water prevent splash because splash makes bubbles create holes film sheet Here another film technique makes easier get good sheets film storage boxes traditional method attaching film hoop lap film over edge hoop much better way coat film side hoop rubber cement Let rubber cement solvents evaporate leaving tacky film hoop pressed down onto poured film adheres well enough film outside hoop can torn away can lift film immediately Also need lift smaller hoops pour normal-sized sheet put small hoops sheet will fit Tear loose lift normally Just precaution process tearing film around hoops may leave small scraps film water arent cleaned off may attach other sheets spoil otherwise good film One microfilm hint storage boxes last photos shows store lot film small area Hoops made fit closely half inch clearance end inside chosen storage box Use tapered blocks attached inside box sides back create self-centering slots will hold hoops cant touch other tapered blocks important contact hoops corners film hoop never touched Instead hoops held securely wedged between tapered blocks box construction gives safe reliable storage indefinite time uter users looks like more computer users out com puters often useful model design prob lems have developed program compute print out dimensions prop blocks ac cording formula published previous column January 1987 issue $1 will send listings Radio Shack Color Computer Model 100 lap top Commodore 64 Send request address given below Tenny PO Box 545 Richardson TX 75080 uration/Wainfan Continued page 59 Current mles count stab area below 50% wing area wing area n-area rule no longer rule book have able find out history rule am certain deleted because being used rather because flying wings winning too much out can give information history rule deleted still exists has inadvertently omitted rule book please contact ed wings An unconventional configuration receiving considerable interest real-airplane world lately joined wing joined-wing airplane has two wings joined tips form diamond shape rear wing root mounted fin front wing attached fuselage wings form diamond front view well top view wing tips same level behind other joined tip body end plate The joined wing invented Dr Julian Wolkovitch holds patent concept joined wing has two attractive advantages first wings brace TErebail RIC Idle-Bar Glow Plugs Long Short$1 89 Also . Traditional line non-idle bar Glow Plugs Six Types 3 Heat Ranges High Performance Glow Element Blow Proof Seal Only $149 Swanson Associates PO Box 151 Wayne NJ e A4 07470ff/j Model Aviation wodris starter system starts The worlds integrated system starter parts accessories gets off superior start Hi-Tork Dynatron The Hi-Tork Starter worlds powerful standard starteI Hi-Tork features several innova tive safety features including patented hand guard keep hands away propeller starter switch located below handgrip help prevent accidental starts The heavy-duty Dynatron Starter delivers one-third maximum power 12 volts closest competitor 47-69% torque standard 12- volt starters greater output Dynatron can used 24 volts Equipped patented safety guard Dynatron backed full two-year warranty against manufacturing defects Both outstanding starters made USA compatible other Sullivan products exemplify dedication high quality technol ogy Youll find Sullivan starters accessories dealer near Get off safe trouble-free start time Sullivan Determined leading independent testing labaratoiy JUCTS nof4v oar overhead Cectflcpodiflr tiMeS OneNonhHavenSeir PO Box5 66Ba MD21224301732-3500 other giving airplane light rigid structure second joined wing has higher span efficiency lower induced drag conventional airplane same span The aerodynamics joined wing require somewhat careful design conventional airplane because interaction between two wings particular critical get twist distribution wings right Dr Wolkovitch suggests following incidence settings used front wing root 30 both tips 00 rear wing root settings incidence decreasing steadily move front vehicle rear joined-wing configuration seems to natural Easy B weight critical wire bracing allowed Bill Hannan has built flying simple joined-wing ROG model Lets hope Billwill share experiences configuration rest us soon induced-drag configurations airplane flying its minimum sinking speed large portion its drag induced drag Conse quently modelers advantage have high span efficiency possible particularly true span-limited events such Pennyplane P-30 classical ap proach reducing induced drag increasing wingspan allowed severai unconventional configurations offer some potential increase span efficiency gain some reduction induced drag increase span 1 Biplanes tandem wings given span lift equai-span biplane nonzero vertical gap has lower induced drag monoplane same span Indoor fliers have exploiting some time Pennyplane outdoor biplanes tandems rare tandem-wing configuration just biplane lot stagger wings separated vertically well horizontally will have same high span-efficiency biplane proper ly-designed tandem very stable has canard- like stall resistance 2 Boxplanes Classical aerodynamic theory states lowest-induced-drag lifting system given wingspan biplane end plates connecting wing tips form rectangular box Wind tunnel tests Lockheed early Seventies showed theory correct induced drag reductions up 40% possible reaiistic boxplane configurations When designing boxplane designer must trade off induced drag reduction produced end plates against parasite drag caused wetted area optimum end plate chord about 30% 40% wing chord trailing edge end plate should trailing edge wings memory serves correctly Hank Cole has considerable recent success Pennyplane biplane boxplane-type tip plates 3 Swept wing tips Recent papers CP van Dam SAE Society Automotive Engi neers AIAA American Institute Aero nautics Astronautics literature have sug gested induced drag wing can reduced sweeping leading edge outer 15% 25 % wing 600 tapering tip Theoretically awing type tip can have span efficiency greater 10 other words awing properly-raked tips can efficient pure elliptical wing Van Dam aiso suggests optimum shape wing tip elliptical leading edge shape coming point trailing edge March 1987 155 PUIGIN AIWTA3LI STAD UT last can optimize Stab ricidence tor best tight characteristics pair glass tilled air adjusters ncluoed pto4ide fc micro screw udjustmerit smaller frost tube Main tube aluminum matching pheriolic socket $495 WING 1131 & SOViETS Alutrinsmnt ulloytubergtorplug-inwitr Included pair special slip-ht pheistlic sockets build wing snucture Now size models 7/9 dis 2$895 11/ dia 5 2$ 995 154 dia s 3$1495 NEWI WING MOUNUNG SET wing mocntlng n1mstem deneloped ton Chidgey 54 fm teat accurate stays tight Thece Iryloc oradiets screws machined wing blocks included $595 prosactarden em sedbytaan Kr5tense o acca atety measa e ero e enator sadder trow alter beg essworkosu 0 55w mngoatanarpaacArgaa Ilitno ninpete wth ustructarts og boaliasdcmrlang $795 Designs es VGA Designs e VGA Designs se VGA Designs es VGA Designs e C * DARNED GOOD AIRMEN C Lightest weight Pilots Available *FULL BODY PILOT KIT L e keVny am ubberpa ts Easy assemble tirrish Kit contain5 Pilot head hands boots helmet cap goggles toll templates easy lirutrontions FUSSy positionabte too.0 Height- Weight- NEW Low Prices- No 206 Scale ll7t 2 oz 1 No205 15 Scale l4ra oz5aO No20* 1/4 Scale 173s 4oz gp IS k/V ItNO203 1/3 Scale 23s 6ozsI6R51 SPORTSMAN OARNSTORMER- FULL BOOn na SUST St C *BUST PILOT KIT Llei4in ninni iiinarninbe paniQ Kit senrains Punt 5034 Seiiiiei unndcap qnuaies una Jackel. loauunwiitr ann fiisn .S PHeight- Weight- Low Fl-ieee5 No 1W SSnjiiri-ina ant55n5at Os~-Ns 105- t Stscnioa-asi-rants695c ID199 No Ion-i 45caie a3n i-i act5 72S*some No itO Scale 534 Pr nutu1455simple Insewingg IrequiredQ 74V5 standing l-OOlj5n- .nOt attainable pleotics.. 0 O o.o iiieii ecirenie iOnS eeiOnr nn oanipininn mu unnin 01 pint S 0 5n5i5 nuii Sane ullie ur nn ellect Sir Se Sui-uico 51 anna airnuali nd 5100 fOr Catalog IS St InC New Veik Staso Reoaeits ania 75 saleS 500 SearS shock MO.bOOsAllo 3 weeks Inn check clear St VGA Designs eo VGA Designs GATE shown sketch George Perryman has using tip shape years Great Speckled Everythings Apparently George way ahead rest us am flying P-30 using swept tips seems very well It interesting note optimum wing shape suggested van Dam looks lot like fins tails sharks dolphins other fast- swimming sea creatures goal design win contests rather eat avoid being eaten tends become highly optimized after million years le non-competition sport models Small simple pure sport models give back fun less cost effort just about anything Free Flight little jewels very unusual configuration great attractions duration contest- winning performance cease important pure fun substituted kinds strange things result classic example type model Bill Hannans immortal Stringless Wonder Most ofus Free Flight have built least some us myself included Stringless Wonder first successful Free Flight model Some greatest fun have Free Flight has flying small strange rubber- powered models always nice have reliable knockabout model collection new supermodel bad mood crashes can always pull out old faithful put few flights restore faith Another class pure sport model great fun what call whirlythings Ceiling Walkers Hannans Unicopter come Im mediately mind small rotating gadgets easy quick throw together can flown very little space also have great virtue rarely ever go QOS newcomers thats out-of-sighteditor flown outdoors features make ideal first models Juniors arejust starting out usually have least model box go Indoor session find great way involve curious Junior-age spectator hobby first time cal suggestion risk provoking cries Heresy would like suggest ideal sport Free Flight model low wing loading low lift-to-drag ratio other words machine has glide somewhere between dropped feather tumbleweed such model built light can have pretty good climb spite its poor L/D isa little overpowered can have great climb combination exciting rapid climb steepbut slowglide gives modeler airplane slot fun does require either large field dethermalizer time since some thermals will denied fly In Fifties Roy Cloughusedto specialize type model produced pub lished some things strange boggle mind including sort lifting- body device looked like cross between blimp Buck Rogers spaceship recent Charybdis 020-powered whirligig Macutcheon another such enjoyable strange ness Low-LID sport models well worth trying lot fun dont have chase too far Barnaby Wainfan 2503 Hardwick St Lake- wood CA 90712 responding advertisers mention read about ModelAviation 156 Model Aviation GATOR Makes Winner 11613 TAIL 45 IIAIX ALL MLSA UT An new Tiger Tail 120 four strokes piped 60 two strokes beautiful performer competition just showing off balso kit machined wood parts complete hardware package includes plug-in ad justable stab parts new wing mounts Wing Span -72 Wing Area -860 sq Complete Deluu Kit$15995 CASE An inoipensrne rcgged molded case protect tnat mipensive transmaten Foe ooth two st ck ann s ngle St Ok transmitters trown earner gin n won mnum tr mann locking case $1895 See Dealer Order Direct Include 51 50 Per Item UPS R R/C PRODUCTS 37t3Porriparo brine ebensacola FL 32514 Ptioiie 904 476-8639 S Engines Atlanta Kits Challenge IV Kits Hattori Pipes / Headers Tettra Wheels / Hardware PO Box 388914-248-8603 Linoondale NY 10540 HIGH PERFORMANCE FLAP ii 0 act albona FASTER & SAFER Z ape r SIre og L Igh t s e 1515 1ZZ Slow tots hot etanea docile landing Sutritiojeg perlgrmaacel Use oith elect saulplsseg-ectlnateo throtl lageistI Switch esrool Fuily adjustable tit 85y entoil tor CaSa installollon Readybaril comes complete silt restractlons 55 50 iDOeroka Seed tor FREE Slotture Deal Inquiries levilad u14e dadw Montana Lawrence Ks 66044
Edition: Model Aviation - 1987/03
Page Numbers: 58, 59, 154, 155, 156
Free Flight Duration BarnabyWainfan THINGS WEIRD enjoyable great satisfaction getting Free Flight model fly well old saying models beautiful high overhead sun shining through tissue model overhead unconventional just plain weird adds some extra spice experience challenge unusual models part attraction feeling achievement make new strange airplane fly second attraction unconventional potential improvements performance Remember breakthrough model led conventional designs fly now radical innovation first appeared Small modifications conventional practice will lead small changes performance Radical ex periments can lead either dramatic improve ments equally dramatic failures know have share both successes make failures worthwhile final attraction strange model design what Detroit refers eway appeal large part fun weird models conversations spark pride having something unlike other model field flying flying wing sweptforward-winged canard some other unusual airplane very easy pick model out gaggle overhead Boston Cabin event has inspired large number unusual models Boston Cabin West 1 4-gram Boston Boston models small enough quick enough build no great loss experiment fails also interesting event compare configura tions since models equal major areas affect performance have same span aspect ratio wing loading Dave Ganzer Hawthorne Slying wing model recent Black Sheep meet reminiscent Marion Baker Delta Kitten home-built early Sixties earlier Lippisch DM-1 experimental glider Photo Tony Naccarato Ligetti Stratos interesting Austra lian home-built seen Oshkosh 1986 Its example boxplane configuration theoretically has lower Induced drag other configuration same span vertical gap between wings Lynne Wainfan working Seeker Hawthorne model Mile Square Park Fountain Valley CA typifies simple effective models can bulitto Haw thorne Flying Wing rules Joined-wing ROG model built Dr Julian Wolkovitch Seventies test joined-wing concept may ancestorof whole generation advanced manned aircraft Photo Dr Julian Woikovitch 58 Model Aviation IMINARY DILL HANNAN EAPPROA MATE SLOT corporate Bearing Concept sketches joined-wing ROG models Bill Hannan simple stick version No1 has built flies well joined wing offers structural aerodynamic advantages over conventional configurations Theres column Ferrel Papics interesting rhombal-wing doortailless model bulitto Hawthorne rules propeller blades made laminated drafting Mylar pushes interpreta tion plastic-propeller rule bit Teepee tandem-winged P-30 model B Wainfan design built byAl Hieger Tandemwinged models very stable have lower induced drag monoplanes lithe wings separated vertically frontal area rubber length propeller diam eter model has obvious performance advantage over pack something unique its configuration giving its extra per formance Boston models have appeared high wings low wings manner tail surfaces including V inverted V canards pusher propellers other interesting configuration features Some weirdies quite competitive conventional high-wing tail-aft models Configuration innovation things gives Boston its charm feel major argument against introduction ap pearance points event Appearance judging has its place Scale competition stated objective Boston Cabin duration within set rules governing configuration appearance points awarded will tend stifle innovation builder unconven tional model taking risk Appearance highly subjective thing appearance judges think model ugly can very well lose contests flies longerthan its competition feel should happen Duration event Appearance judging would increase time effort required build competitive air plane since time would have spent detailing finishing model well good Scale models AMA already has plenty Scale events rule book people want build pretty models have judged appearance extra construction time volved would make less attractive try something new different because extra effort would lost experiment proved failure addition appearance points Boston Cabin rules would convert fun-and-innovative Duration event sort Free Flight Standoff Scale event Hawthorne flying wing Indoor event devised Burbank-based Black Sheep club flown southern California area Briefly stated rules follows 1 The model must have tail canard other horizontal stabilizing surface ie flying wings 2 Biplanes permitted both wings have same planform no stagger incidence difference between wings 3 The model must weigh 14 grams rubber 4 The model must use commercially-avail able plastic propeller Propeller modification ie sanding trimming balancing etc permitted 5 The model its flying configuration propeller place must fit cube measuring 18 x 18 x 18 inches Hawthorne Flying Wing models easy quick build amazing number different configurations have appeared Black Sheep Flightmasters meets Hawthorne models turning times approaching two minutes under 26-foot ceiling usually rugged enough flown outdoors tend jo thermal well because low wing loadings Models originally built indoor Hawthorne contests have won outdoor annual Northrop Flying Wing Contest several times recent years Flying wing tailless models hold particular fascination have some theoretical advantages over conventional models some practical advantages well thing partic ularly like elimination need build warp-prone tail surfaces simplest solution problem building good straight tailplane build Flying wing models can quite competitive certain events primary advantage can built lower wing loading equivalent-weight conventional model since weight wetted area tail conventional model can part wing tailless model events wing area wing loading 600 SWEPT TIP Optimum wing shapes suggested CP VanDam Raked tips can reduce wings induceddrag upto 15% The6O-swepttipis much easierto build elliptical wing can efficient regulated flying wing can very effective example P-30 wing area restricted although mini mum-weight rule own Cyrano P-30 pub lished construction article December 1986 issue magazine has successful contest career flying against conventional models wing area restricted rules wing loading set combination minimum weight/maximum wing area rules flying wing disadvantage since cannot develop high lift coefficient tail-aft design highly-cambered wing time AMA rule Free Flight General section rule book stated something effect flying wing model s area would counted purposes maximum-wing-area rules allow flying wing have same total area conventional model 50% stab Continued page 154 March 1987 59 Wright Flier built Dick Baxter cruising nearthe ceiling model spans about 14 really cleverly-disguised A-frame twin-pusher flies quite well Simple cute sport models likethisgivea lotof enjoyment relativley little time effort spent building Tony Naccarato atthe recent Northrop Flying Wing contest twln-049-powered scale Northrop B-35 infamous Rodan elec tric modelwhich typifies Its monstrous namesake terrifying Its builder com petition alike Plc Mary Lou Naccarato Larry Kruse profile scale Beech Starship rubber model atthe 1984 Reno Nats Profile Scale becoming quite popular because models build quickly also great way test new configuration before put ting effort build properly detailed 3D version Warner photo Tomy Timer/Dunlop Continued page 146 keep fuel off it wont slow down unless gets really messy happens take apart clean al cohol get ready go again ndoor/Tenny Continued page 57 largest film hoop hope fill reason properly-poured film needs room spread naturally Cramped pouring space causes either very uneven film color artificially thick unstable sheet film Film has its spreading artificially limited poor risk use models Part problem pouring microfilm maintain good control amount microfilm solution deposited water second photo microfilm saga series shows shortcut problem Uniform distribution solution has two elements rate fluid flow rate distribution Rate distribution requires sweep arm across tank rate pouring spout photo has set interchangeable different-sized orifices plan match orifice required pouring rate always use same orifice hatch film solution free learn uniform pouring motion Be sure keep nozzle uniformly close water prevent splash because splash makes bubbles create holes film sheet Here another film technique makes easier get good sheets film storage boxes traditional method attaching film hoop lap film over edge hoop much better way coat film side hoop rubber cement Let rubber cement solvents evaporate leaving tacky film hoop pressed down onto poured film adheres well enough film outside hoop can torn away can lift film immediately Also need lift smaller hoops pour normal-sized sheet put small hoops sheet will fit Tear loose lift normally Just precaution process tearing film around hoops may leave small scraps film water arent cleaned off may attach other sheets spoil otherwise good film One microfilm hint storage boxes last photos shows store lot film small area Hoops made fit closely half inch clearance end inside chosen storage box Use tapered blocks attached inside box sides back create self-centering slots will hold hoops cant touch other tapered blocks important contact hoops corners film hoop never touched Instead hoops held securely wedged between tapered blocks box construction gives safe reliable storage indefinite time uter users looks like more computer users out com puters often useful model design prob lems have developed program compute print out dimensions prop blocks ac cording formula published previous column January 1987 issue $1 will send listings Radio Shack Color Computer Model 100 lap top Commodore 64 Send request address given below Tenny PO Box 545 Richardson TX 75080 uration/Wainfan Continued page 59 Current mles count stab area below 50% wing area wing area n-area rule no longer rule book have able find out history rule am certain deleted because being used rather because flying wings winning too much out can give information history rule deleted still exists has inadvertently omitted rule book please contact ed wings An unconventional configuration receiving considerable interest real-airplane world lately joined wing joined-wing airplane has two wings joined tips form diamond shape rear wing root mounted fin front wing attached fuselage wings form diamond front view well top view wing tips same level behind other joined tip body end plate The joined wing invented Dr Julian Wolkovitch holds patent concept joined wing has two attractive advantages first wings brace TErebail RIC Idle-Bar Glow Plugs Long Short$1 89 Also . Traditional line non-idle bar Glow Plugs Six Types 3 Heat Ranges High Performance Glow Element Blow Proof Seal Only $149 Swanson Associates PO Box 151 Wayne NJ e A4 07470ff/j Model Aviation wodris starter system starts The worlds integrated system starter parts accessories gets off superior start Hi-Tork Dynatron The Hi-Tork Starter worlds powerful standard starteI Hi-Tork features several innova tive safety features including patented hand guard keep hands away propeller starter switch located below handgrip help prevent accidental starts The heavy-duty Dynatron Starter delivers one-third maximum power 12 volts closest competitor 47-69% torque standard 12- volt starters greater output Dynatron can used 24 volts Equipped patented safety guard Dynatron backed full two-year warranty against manufacturing defects Both outstanding starters made USA compatible other Sullivan products exemplify dedication high quality technol ogy Youll find Sullivan starters accessories dealer near Get off safe trouble-free start time Sullivan Determined leading independent testing labaratoiy JUCTS nof4v oar overhead Cectflcpodiflr tiMeS OneNonhHavenSeir PO Box5 66Ba MD21224301732-3500 other giving airplane light rigid structure second joined wing has higher span efficiency lower induced drag conventional airplane same span The aerodynamics joined wing require somewhat careful design conventional airplane because interaction between two wings particular critical get twist distribution wings right Dr Wolkovitch suggests following incidence settings used front wing root 30 both tips 00 rear wing root settings incidence decreasing steadily move front vehicle rear joined-wing configuration seems to natural Easy B weight critical wire bracing allowed Bill Hannan has built flying simple joined-wing ROG model Lets hope Billwill share experiences configuration rest us soon induced-drag configurations airplane flying its minimum sinking speed large portion its drag induced drag Conse quently modelers advantage have high span efficiency possible particularly true span-limited events such Pennyplane P-30 classical ap proach reducing induced drag increasing wingspan allowed severai unconventional configurations offer some potential increase span efficiency gain some reduction induced drag increase span 1 Biplanes tandem wings given span lift equai-span biplane nonzero vertical gap has lower induced drag monoplane same span Indoor fliers have exploiting some time Pennyplane outdoor biplanes tandems rare tandem-wing configuration just biplane lot stagger wings separated vertically well horizontally will have same high span-efficiency biplane proper ly-designed tandem very stable has canard- like stall resistance 2 Boxplanes Classical aerodynamic theory states lowest-induced-drag lifting system given wingspan biplane end plates connecting wing tips form rectangular box Wind tunnel tests Lockheed early Seventies showed theory correct induced drag reductions up 40% possible reaiistic boxplane configurations When designing boxplane designer must trade off induced drag reduction produced end plates against parasite drag caused wetted area optimum end plate chord about 30% 40% wing chord trailing edge end plate should trailing edge wings memory serves correctly Hank Cole has considerable recent success Pennyplane biplane boxplane-type tip plates 3 Swept wing tips Recent papers CP van Dam SAE Society Automotive Engi neers AIAA American Institute Aero nautics Astronautics literature have sug gested induced drag wing can reduced sweeping leading edge outer 15% 25 % wing 600 tapering tip Theoretically awing type tip can have span efficiency greater 10 other words awing properly-raked tips can efficient pure elliptical wing Van Dam aiso suggests optimum shape wing tip elliptical leading edge shape coming point trailing edge March 1987 155 PUIGIN AIWTA3LI STAD UT last can optimize Stab ricidence tor best tight characteristics pair glass tilled air adjusters ncluoed pto4ide fc micro screw udjustmerit smaller frost tube Main tube aluminum matching pheriolic socket $495 WING 1131 & SOViETS Alutrinsmnt ulloytubergtorplug-inwitr Included pair special slip-ht pheistlic sockets build wing snucture Now size models 7/9 dis 2$895 11/ dia 5 2$ 995 154 dia s 3$1495 NEWI WING MOUNUNG SET wing mocntlng n1mstem deneloped ton Chidgey 54 fm teat accurate stays tight Thece Iryloc oradiets screws machined wing blocks included $595 prosactarden em sedbytaan Kr5tense o acca atety measa e ero e enator sadder trow alter beg essworkosu 0 55w mngoatanarpaacArgaa Ilitno ninpete wth ustructarts og boaliasdcmrlang $795 Designs es VGA Designs e VGA Designs se VGA Designs es VGA Designs e C * DARNED GOOD AIRMEN C Lightest weight Pilots Available *FULL BODY PILOT KIT L e keVny am ubberpa ts Easy assemble tirrish Kit contain5 Pilot head hands boots helmet cap goggles toll templates easy lirutrontions FUSSy positionabte too.0 Height- Weight- NEW Low Prices- No 206 Scale ll7t 2 oz 1 No205 15 Scale l4ra oz5aO No20* 1/4 Scale 173s 4oz gp IS k/V ItNO203 1/3 Scale 23s 6ozsI6R51 SPORTSMAN OARNSTORMER- FULL BOOn na SUST St C *BUST PILOT KIT Llei4in ninni iiinarninbe paniQ Kit senrains Punt 5034 Seiiiiei unndcap qnuaies una Jackel. loauunwiitr ann fiisn .S PHeight- Weight- Low Fl-ieee5 No 1W SSnjiiri-ina ant55n5at Os~-Ns 105- t Stscnioa-asi-rants695c ID199 No Ion-i 45caie a3n i-i act5 72S*some No itO Scale 534 Pr nutu1455simple Insewingg IrequiredQ 74V5 standing l-OOlj5n- .nOt attainable pleotics.. 0 O o.o iiieii ecirenie iOnS eeiOnr nn oanipininn mu unnin 01 pint S 0 5n5i5 nuii Sane ullie ur nn ellect Sir Se Sui-uico 51 anna airnuali nd 5100 fOr Catalog IS St InC New Veik Staso Reoaeits ania 75 saleS 500 SearS shock MO.bOOsAllo 3 weeks Inn check clear St VGA Designs eo VGA Designs GATE shown sketch George Perryman has using tip shape years Great Speckled Everythings Apparently George way ahead rest us am flying P-30 using swept tips seems very well It interesting note optimum wing shape suggested van Dam looks lot like fins tails sharks dolphins other fast- swimming sea creatures goal design win contests rather eat avoid being eaten tends become highly optimized after million years le non-competition sport models Small simple pure sport models give back fun less cost effort just about anything Free Flight little jewels very unusual configuration great attractions duration contest- winning performance cease important pure fun substituted kinds strange things result classic example type model Bill Hannans immortal Stringless Wonder Most ofus Free Flight have built least some us myself included Stringless Wonder first successful Free Flight model Some greatest fun have Free Flight has flying small strange rubber- powered models always nice have reliable knockabout model collection new supermodel bad mood crashes can always pull out old faithful put few flights restore faith Another class pure sport model great fun what call whirlythings Ceiling Walkers Hannans Unicopter come Im mediately mind small rotating gadgets easy quick throw together can flown very little space also have great virtue rarely ever go QOS newcomers thats out-of-sighteditor flown outdoors features make ideal first models Juniors arejust starting out usually have least model box go Indoor session find great way involve curious Junior-age spectator hobby first time cal suggestion risk provoking cries Heresy would like suggest ideal sport Free Flight model low wing loading low lift-to-drag ratio other words machine has glide somewhere between dropped feather tumbleweed such model built light can have pretty good climb spite its poor L/D isa little overpowered can have great climb combination exciting rapid climb steepbut slowglide gives modeler airplane slot fun does require either large field dethermalizer time since some thermals will denied fly In Fifties Roy Cloughusedto specialize type model produced pub lished some things strange boggle mind including sort lifting- body device looked like cross between blimp Buck Rogers spaceship recent Charybdis 020-powered whirligig Macutcheon another such enjoyable strange ness Low-LID sport models well worth trying lot fun dont have chase too far Barnaby Wainfan 2503 Hardwick St Lake- wood CA 90712 responding advertisers mention read about ModelAviation 156 Model Aviation GATOR Makes Winner 11613 TAIL 45 IIAIX ALL MLSA UT An new Tiger Tail 120 four strokes piped 60 two strokes beautiful performer competition just showing off balso kit machined wood parts complete hardware package includes plug-in ad justable stab parts new wing mounts Wing Span -72 Wing Area -860 sq Complete Deluu Kit$15995 CASE An inoipensrne rcgged molded case protect tnat mipensive transmaten Foe ooth two st ck ann s ngle St Ok transmitters trown earner gin n won mnum tr mann locking case $1895 See Dealer Order Direct Include 51 50 Per Item UPS R R/C PRODUCTS 37t3Porriparo brine ebensacola FL 32514 Ptioiie 904 476-8639 S Engines Atlanta Kits Challenge IV Kits Hattori Pipes / Headers Tettra Wheels / Hardware PO Box 388914-248-8603 Linoondale NY 10540 HIGH PERFORMANCE FLAP ii 0 act albona FASTER & SAFER Z ape r SIre og L Igh t s e 1515 1ZZ Slow tots hot etanea docile landing Sutritiojeg perlgrmaacel Use oith elect saulplsseg-ectlnateo throtl lageistI Switch esrool Fuily adjustable tit 85y entoil tor CaSa installollon Readybaril comes complete silt restractlons 55 50 iDOeroka Seed tor FREE Slotture Deal Inquiries levilad u14e dadw Montana Lawrence Ks 66044