IVE READ Fred Flies Fred talking about Fred Weaver San Jose CA Fred third person achieve LSF Level V completing rigorous test 1976 John Baxter Steve Work got Level Vs 1975 Gliders equipment available days finishing Level V especially tough jobstill matter Fred three-time winner very popular prestigious Visalia Fall Soaring Festival win ning last year trusty Airtronics Cumic can appreciate credentials Fred has built up storehouse Soaring knowl edge uld wonderful burrow could So saw Fred Flies piece editor John Dvorak South Bay Soaring So ciety newsletter Silent Flyer knew fliers would want read Actually what John did transcribe talk Fred gave club meeting talk included much material questionand-answer type Johns report what Fred said figure Out lift some basic easy-to-understand things to plan before launch come off tow plane will either glide less straight rise sink turn way other Launching right lift won derful doesnt happen too often need know what other things occurs plane turns right itself indi cates lift left pushing plane away must steer opposite way plane wants go turning left get thermal Sink bad least indicates unstable air some mass air going up some other air coming down replace later straight normal glide no up/down bumps left/right turns bad news because indicates air probably stable no ther mals being generated thing case cruise planes best glide ratio try cover much ground possible look ing some kind lift What best lift generators Any dark surface such parking lots pavement rooftops done tar ything dark colored Dark surfaces absorb heat sun warm air adjacent sur rounding air mass warms sufficiently breaks free rises rising patch air pulls air immediate area replace Any dark surface next structures surfaces light colored will especially 46 Model Aviation Radio Conoi Soaring Byron Blakeslee 3134 N Winnebago Dr Sedalla Co 90135 Top placers Memphis Area Soaring Societys 1988 Fail Soaring Tournament LR Ron Stanfield Bob Sowder Neal Jacobs Bill Jenkins Dick Renakers Chip Gibbs Photo sent MASS president Bob Sowder looks like flew interesting mix designs Bernie Coleman Charlotte NC very nice quarter-scale LS-4 Rowing kit Aile ron servos built glass wings Rowing planes available through Tony Arnoux Look againl Thats really figurine posed front Bill Wynans beautiful Va-scale ASW 20 Kit available American Sailplane Designs San Diego CA realistic can get effective because difference surface tem peratures rural areas plowed ground next planted light-colored crops produces differences surface temperatures thus creates ther mals middle square mile asphalt would fewer thermals fringes would thermal activity because temperature difference effect What best search pattern use Tony Arnoux Miami FL 1 35-scale DG 202 Rake Modeile Germany Gor geous Sailplane features all-glass construc tion available through Tonys Imparts Co Tony has new catalog Scale Sailplanes See column information GOLDEN EDmON WE OFFER THE BEST HERES WHY 4 days covered w/good continuity Professional multi camera coverage Vast editing w/complete scenes Excellent narration & music Dynamic indoor showcase static dispiay Over 75 entries w/fuIl model & pilol reports Flighi analysis w/fuII size counterparts Reflections past masters events winners Banquei coverage w/awards & roasting ceremonies ENDORSED BY SCALE MASTERS BOARD SPONSORED BY h3 ER -K & B RUN TIMES APPROX 314 HRS TOTAL RETAIL PART 1 5995 PART 2 5495 SPECtAL ONLY 4795 / 4495 BOTh FOR ONLY 3705 SAVE 2700 XJU syria nt,j rat FOX DONT SETrLE FOR CHEAP SEMIPROFESSIONM COPIES GO WITH THE BEST ALL VIDEOS ON QUALITs MAXELL TAPE W/DELUXE CASES TO ZiNVITATIONAL TOURNAMENT OVER 14 HRS VALUED PRICED REG PR $4995 YOURS FOR ONLY $3995 BUY ANY 3 VIDEOS AT RETAIL PICK 4TH ONE FROM BELOW 11-71 FREE OTHER GREAT VIDEOS 1Airplane Funnies 30 mins3495 2Basic Conat Beginners 107 mins4195 31984 Scale Masters 60 mins3495 41987 Scale Masters 64 mins3995 51988 Scale Masters 90 mica2995 6Warhirds Action SO mins4495 7WhIch Way Up Aerobatirsl 70 mins4495 ORDERING Check MO Visa/Master Card Include phone no orders 350 Shippin 100 per extra No CODs nada res add6 tiotial others aJd 12% tiotal ACADEMY OF AVIATION R & D PO BOX 277 l Crest IL 60429 7083350776 Sales Final PRICES SUBJECT TO CHANGE WITH OUT NOTICE July 1990 47 Asher Charmichaci Mobile AL steadies 5-meter-wingspan 1A-scale SB 10 Rake kit available through Tony Arnoux Scale Nasfrr Continued page 154 1 iv utiucri Send $100 coupon address toADDRESS ar Ave ____________________________ ________ N NJ 07922CITYSTATEZIP L SPECIALISTSINCUSTOMCOX TEE DEE & REED ENGINES 020S 049S 051S 074S & 09S ALLCUSTOM&STOCKPARTS VAILABLE INDIWDUALL V COMPETITIONACCESSORIES RACING WHEELS KLOTZOIL CARBON FIBER SOLID LINES ALL KINDS OFFUEL TUBING THREE BRA NDSOFGLOWPL UGS HA RD-TO-FIND HA RD WARE OLD TIMER SUPPLIES COILS CONDENSERS NGK& STIlT SPARKPLUGS SILK8 COLORS QUA LITYDOPE BRUSHES 5& 7LOOP 1/4RUBBER BANDS TRANSISTORIGNITIONSYSTEMS RESISTOR HIGH TENSIONLEADS 1/2A TEXACO PLA YBOYSR KIT 1/2A TEXACO ENGINES & PARTS KSB & IGNITION TIMERS RUBBERPOWERKITS PROPS TISSUEAND OTHER SUPPLIES C VA NOA CR YLA TES & EPOXIES ORDER BY MAIL OR PHONE 619 7284365 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING HANDLING AND INSURANCE FEE $300 STOCK ORDERS SHIPPED WITHIN 24 HRS RC Scale/Aune Continued page 151 Equal C read 327 Therefore make 327-in circle piece aluminum cut pop can compass cut out scissors rough up underside 80-grit sandpaper glue fuselage us ing RC-56 glue Note will need measure calculate location panel well us ing same method have found great value Scale modeling has come result building flying per severing giving Rewards always lag behind effort life Happy building RC Soaring/Blakeslee Continued page 47 come off tow best cheat some already something scooting over best pattern pays know whats going air before launch Failing having other information lo cal hot spots observing birds bugs etc fly straight upwind watch see plane drifts right left drifting side whats happening plane being sucked some sink will likely thermal other side wing tip suddenly moves up edge thermal trick turn back toward thermal try find core go straight out cant find anything plane getting small hard see dont just turn around come straight back cause youll flying through same air just searched Go off side other circle back wind will help bring plane back What signs fly right middle thermal What youll see plane speeding up tail rising control re sponse improving Whenever see tail airplane go up know its lift Thats can give little rudder aileron pull back stick go Youre make tail Glider sensi tive lift center-of-gravity balance point should far rearward can fly ie Glider being prone stalling too squirrelly fly What happens sink plane becomes sluggish tail may drop slightly Never fly plane tail down Push nose down zip through body sink Something making air go down air somewhere around going up fly another hundred feet should lift Never circle sink never hold Up eleva tor sink its like putting brakes Up el evator does make Glider go uponly up air makes go up rule Speed up sink slow down lift Sink bad because dicates must thermal nearby have quickly fly through patch sink other side up air core thermal have use Glider identify boundaries ther mal paint mental picture what looks like After plane detects thermal dont im mediately start circling Fly straight think thermal until plane stops go ing up identifies other side ther mal Make turn back thermal upwind direction headed upwind sink encountered youve identified another bounda ry thermal So move turn downwind slightly get back thermal lower plane faster has done Low thermals small dont have much altitude play wind blowing 5 mph thermal also drifting speed higher get faster thermal will drift Winds higher altitudes usually stronger ground level As gain alti tude thermal becomes larger can open up turn make bigger circles Al ways drift toward side circle producing strongest lift should stay cored What plane high ther mal want find another thermal because getting too far downwind away field Dont head straight back upwind Thats sink feeding ther mal youre Instead head back upwind an gle left right wind direction What about launching sink ready launch wind picks up Thermal lift headed downwind know youll launching right sink 1 Quickly launch chase thermal downwind 2 Stand winch try zoom off angle next thermal 3 Come up servo problem Sandbagging option 3 unsportsmanlike decision have make hurry based fast thermal moving what kind plane youre flying Gentle Lady 154 Model Aviation SUNBIRD SENSATION WITH STYLE Sunbird combines eye opening performance truly distinctive styling terrific flying design Whether choose 40 size Sunbird 10 Sunbird Jr youll find Sunbird perfect sport plane %fl PRECISION PRODUCTS INC 714 592-5144 510 E Arrow Highway San Dimas CA 91773 JUN lIt V-UIIVVtIVI LJIf V VERA GES OVER 9000 PROPS I! IMMEDIA TESHIPMENTON WSA/MC summer 1940 Jim Walker introduced A-J Fireball U-Control world Countless thousands got first taste model aviation excitement building flying famous airplane commemorate 50th Anniversary birth A-J Fireball proudly announce special limited-edition kit Jim Walkers 1940 original kit contains U fully carved Balsa fusealage Balsa wing tail parts cut shape U hardware hardwood motor mount U decals U complete instructions illustrations U brief history A-J Fireball Offered limited edition 50th Anniversary A-J Fireball numbered dated signed just like kits first produced 1940 can make 60 kits available per month order yours TODAY YES Enclosed check money order $17950 YES cant decide Please send information A-J Manutacturing Inc PO Box68132 Portland OR 97268 503 653-2038 CAN ib 40 fj M* % going zoom So its best have understand ing options prior stepping up winch dont want waste time deciding what greatest thing world being ready launch having gentle breeze come up behind Its wrong direction means downwind launchbut will directly thermal What has happened breeze feel air feeding thermal just front Rule sudden shift direction breeze indicates local thermal present breeze blowing toward thermal What wave action Sometimes windy days youll find fixed ridge wave lift Making S-turns back forth along wave will sustain flight lift plane higher altitudes lift acts like slope lift created wind bounces off side hill may hang out 20 minutes sud den disappear Wave lift may caused sur face features upwind difference temperature layers pressure tree line get good spot landings things guarantees spot landings making same approach single time first thing figure out land plane spot means practicing downwind ap proach turn wind final glide straight spot As wind picks up can shorten downwind leg turn soon er Onto final approach spot sky start downwind leg can thought Initial Point IP Another trick stick plane thats easy fly Polyhedral ships like Oly II Para gon Gemini easy fly Stick same plane keep flying Dont switch air planes Practice landing approach al ways make same approach Youll landing either too short too long learn make proper compensations watch can come land spot time after time after time What about timed landings next step af ter learning make spot landings learn land against watch easiest way have buddy time landing approach IP Once know distance terms time have position normal airspeed time dont need watch So timer will quiet can make normal approach concentrate making 100-point spot landing within couple seconds target time newer airplanes have higher wing loadings have flaps crow Editors note Crow refers Gliders configuration flaps fully extended Down ai lerons fidly extended Up RMcM timed approach can fun because can adjust conditions cheat watch Come high approach fair amount time left watch wont gam bling poor landing because low altitude encountering sink Govern time speed flaps crow elevator youll get time Cross-Country better start high search thermals course Some pilots will fly high can before entering course Others will enter course much sooner search lift along way Continued old timer perfectly proportioned modeling Curtiss Robin 049 EngInes -Channel R/C 41 Wingspan Electric Power Optional $2255 0 Very few full scale ajcraff Ideally soiled model flishf Cs l5 fhe appealing old Curfiss Robin born spruce linen age beautifully proportioned rubber elecfric glow engines Easy end fun build trainerlike performance Flyline Models Cafalog hOt Phono 17031 2739593 INE MODELS INC PO Boa 2136 Faintac VIrginia 22031 USA July 1990 155 w 18 I . 0 G - 4WWaL&ez II b luni your pnaler isIs airfoil plstler FOILED AGAIN! C PLOT AIRFOILS IN ANY CHORD UP TO 24 INCHES MODIFY THICKNESS CAMBER & TRAILING EDGE PLOT SKIN THICKNESS FOR SHEETED WINGS ENTER DATA EASILY 'IA INTELUGENr EDITOR UsER-FRIENDLY MENU-DRIVEN OPERATION INCLUDES Il-PAGE ILLUSTRATED USER MANUAL $4500 naraauaai COok afl ussno~4 asquIas I5MPClflAT uaoo551n.O comma anO Ca mama p0,w Olas oamourC 000r yp Caatas iowan SOS a5 daha Sins atom aaao 00 CYGNET Software714 496-6961 24843 Del Prado #t4lB Dana Point CA 92629 FOAMAIRE 74 IN WING SPAN 6-7 LBS 45-60 POWER 4 OH PLY FOAM AND BALSA WOOD KIT $6995 SEND $100 FOR CATALOGcART 1 NEODESHA KS 66757 OF SAC KITS AND ACC316 325-2821 FREE SHIPPING ON KIT ORDERSISAASTERCARD part country its easy at-newsletter think youll enjoy way ex- density viscosity air unchange tam high altitude hut around Taft CA high al-plains some technical stuffable design purposes titude can achieved quickly Around think wasting time get real high Ofttimes sit listen Hot Shoes talk Rn 6360 x Velocity ft/sec just go Just get up decently high thenabout what should shorten bubble x Length chord ft get goinglengthen transition Guess what Theyre talkSet course wind toward youring about model Gliders Now dont take reference 88 ft/sec ph 44 destination Youll need plane can trim andSo got out Martin Simons book Model Air-30 22 o Glider 10-in-chord just let fly like Paragon big Sagitta Youcraft Aerodynamics published Argus Bookswing flying 30 mph produces Rn cant have plane have fly timeBB Ed Old gave helping233000 will give Reynolds number have able adjust trims let itwhile president new Soartech #8compatible polars find tech manuals go have have ship will thermalthat Herk Stokely sent Princeton pa- Visualize Sand surface wing really easily decide itper Three Amigos sent back 1985air molecules Count grains wing information floating around Iover period time grains er Thanks go Fred Weaver John Dvorakshould able pop bubbles best ofcloser come flying like real airplane letting us pass along great tips Pleasethemless scale effect can count let know would like see Reading through stuff once prettygrains wing increasing speed instructional-type materialdry Oh occasion discussion would livenchord Comprendo up little plane would stall could new catalog Scale ldts available fromsee spinning out sky minds eye 0 Boundary layer area between airTony Amoux Miami Tonys catalog includesThe excitement would build direct proportionfoil surface point above below wing about dozen mostly quarter-scale-size Sail-to Reynolds number overall after asurface air has affected planes German makers Roke Rowingcouple hours Id lose interest chap-passage wing Wik Gliders fly beautifully areters would spaced over few months say top quality Alto included catalog anothing books best way study nar boundary layer visualize page two goodies appeal Scale enthus-and retain informationMany sheets thin paper stacked layer upon iasts Send $4 check refundable order think its time put informa-layer above wing layer moving Imparts Inc. 1736 NW 82 Ave Miami FLtion very consolidated form something likeslower relation wing above 33126Go rebuild later necessary thinkit until closest layer surface moving Competitors F3B should note Tonysit best start Out list definitions withat same speed wing Same hotreal business importing German auto partsthe terms defined rational ordertom surface low-drag condition good source legal Bosch winch ear progresses might stick somepreferable turbulent layerexcept motorsat much lower list prices Write formore high-tech stuff iffin yall dont laughfact laminar flow separates sooner reat detailsat way think about stuff like thistaches much later positive laminar flow low drag What heck guy talking about olds numberhigher efficiency following article Chuck Griswald appeared negative ease will de Thousand Oaks Soaring Society newslet- Air Density/Viscosity x Velocitytach surface difficulty getting ter TOSS-Up Chuck editor fine ngthit reattach PreBuilt MV-i Typhoon * Designed Ron Chidgey * 100% Gator R/O Products Components wing/stab tubes & adjusters canopy & cowl HIGH QUALITY *100% built up construction precision ~g5 ULTRA SWITCH HARNESS * Bob Violetts Magnalite GB 125 used Gold contacts inside switch formersAJI connectoss manufactured * Satisfaction GuaranteedbyFutaba Positive lock Mounting simply requires dnll Thousand sq inWOODORAINS INCing 114 inch hole 100% tested Model Now Available 9 BOX 122Custom cable lengths availble Cumming GA 30130upon request minimal cost 404-889-4758ULTRA SWITCH HARNESS $1995 Tim Megan Richardson PLUS $250 PLUS $600SHIPPING & HANDLING SHIPPING & HANDLINGGa Residents Add 6% Sales Tax 156 Model Aviation E 10 SPAN 30-33 LBS 50-75CC POWER 5-10 LB PAYLOAD OPTIONAL SPREADER KIT $26995 SPDKiT$1995 TRAINER 10 SPAN 19-22 LBS 35-42CC POWER CHOOSE 3 OR 4 OH SLOW AND STABLE 3 CH $14995 4 CH $16495 rOISCOVER HOW GOOD FLYING REALLY CAN BE EAA flying its very best Whether youre pilot builder simply enjoy airplanes EAA Once youve joined become integral part aviations dynamic group EAA can organizationis recognized internationally newsmaker aviation today. pushing cutting edge sport aviation technology new exciting limits adventure can experience others share passion flying JOIN EAA JOIN TODAY $35 ANNUALLY call EAAs TOLL FREE MEMBERSHIP HOTLINE d 4O Major credit cards accepted Something Everyone 0 SPORT AVIATION authoritative monthly magazine . recognized worlds finest aviation publications 0 Three special Divisions interested specific aircraft Antique/Classic AC Aerobatic Warbirds 0 EXPERIMENTER hly publication homebuilding light plane ultralight enthusiasts 0 An extensive chapter network active 700 local areas 0 EAA Technical counselors advise construction projects 0 EAA Family Memberships 0 Specialized aviation insurance coverege 0 EAA Mastercard Gold MasterCard programs S e Bubbles boundary layer becomes de tached usually lower-pressure regions know thickest part wingthe part lift produced Visualize lift pulling sheets paper off surface high point reattaching near trailing edge stagnant area called bubble creases drag dramatically Its just like gluing hunk balsa top wing air mol ecules dont move off wing area As angle attack continues increase after bubble has formed bubble breaks bound ary layer cannot reattach stall occurs e Attached boundary layer stays surface parallel e Detached boundary layer becomes sep arated surface wing bound ary layer may become detached point reattach itself forming bubble may never reattach causing very high drag pos sibly stall s turbulent boundary layer visualize Very fine sand tumbling grain over grain along length airfoil Its rolling motion always thicker laminar flow positive turbulent flow sticks surface longer harder detach com pletely surface negative higher drag laminar flow sition zone area bound ary layer goes laminar turbulentor flow detaches completely Ramps designed airfoils help boundary layer stay attached help reattach af o Hysteresis defined physics fail ure property changed external agent return its original value cause change removed For high-lift hysteresis Princeton papers visualize An airfoil increasing its angle attack AQA point right before stall Mark point mind Now increase AQA just bit get stall Now recover As de crease AOA airfoil must drop below mark minds eye before has recovered again flying high-lift hysteresis leading edge stall bubble breaks right leading edge For moderate-lift hysteresis visualize An airfoil increasing its AQA first did Before reaches stall point seems slow down drag increases would swear someone deployed spoilers al though continue pull Up trim starts look promising AOA increases slightly flying again little Up trim its stall time Just first example old bubble formed time reattached toward trail ing edgea long bubble cause highdrag condition increased AOA trailing edge bubble started forward again drag decreased Now since little good bit must better Wrong Back high-lift hysteresis leading edge stall would anyone fly plane like have flown Gliders use E-205 airfoila Sagitta exam ple Did anyone say Hey buddy got fly plane fastget step someone thought Maybe put turbulator strip dont have scream around sky Hes right turbulator strip explained next paragraph RMcM course idea Eppler airfoils keep laminar longer cut down drag Well best-laid plans etc e Turbulators trip up laminar flow start sand rolling over surface wing raises drag bit keeps boundary layer surface longer keeps dreaded bubble forming soon full-size aircraft flow seldom lami nar Reynolds numbers high panel line rivet will start turbulent flow RC Gliders Rns below million air appears viscous therefore remains lam inar over larger imperfections turbulate wing apiece trim tape 0010 thick / wide will usually trick OK havent bored tears think about Its going take think up some high-tech stuff just listened CO Top Gun Squadron Miramar try explain G forces TV program Wings dont feel bad Just scream holler cant take promise stop Dont stop Chuck often takes different slant technical explanations before light bulb goes know enjoyed reading Continued page 161 July 1990 157 Full participation EAAs famous OSHKOSH Fly-In Convention many benefits Get full story. ter bubble has formed low Rns like ramps designed cover upper surface airfoil dont look chances wont find RC Soaring/Blakeslee Continued page 157 Chuck Griswalds visualizations hope helped some readers understand what Hot Shoes arc talking about Masters Soaring contest very presti gious because limited fliers having outstanding qualifications Only LSF Level IVs Vs Nats winners eligible Mas ters cosponsored National Soaring Soci ety NSS President Pete Carr kindly sent report March 1990 Masters Soaring contest hosted Silent Wings Soaring Associa tion SWSA West Covina CA directed Pete Olsen site school mid dle town surrounded homes hospital factories Launch equipment Rahm winches retrievers very snappy worked flawlessly during 14 rounds Pete last years Masters CD Myles Mo ran came up mix flight times land ing tasks really tested pilots first landing task runway four feet wide 20 feet long divided five squares point values 20 30 40 30 20 other landing used standard 25-foot tape 100-point max cases runway land ing eliminated loud landings mentioned 89 report Winds calm time light easy-to-find lift Notable among entrants Brian Ag new age 24 Florida flying Ed Bertons new 35-meter Phoenix kits ATRCS-modified Airtronics Module radio early rounds Don Edberg fought lead few points apart Joe Wurts close behind flying Falcon 880 Three pilots flew hot new Mark Allen Falcon con test including eventual winner Bob McGowan northern California nine Air tronics Vision radios use several ATRCS-modified 7SPs making Airtronics RF link choice Masters three Geminis two Paragons flown both ing Ed Slobod designs two crashes during contest Rich Garners Larry Jolly Model Products Chee tah broke elevator pushrod zoom destroyed wing uses balsa ribs full balsa sheeting displayed amazing strength spite terrible flutter set up stab other crash saw Brian Agnews Phoenix tuck inverted dive altitude 100 ft circling landing pattern last round appeared airborne battery failed since little warning trouble Brian Phoenix made impressive show ing finished ninth place spite zero last landing top 10 1 Bob McGowan 1000 Pt Falcon 880 2 Terry Koplan 997 Pt Vi king 3 Joe Wurts 996 pt Falcon 880 4 Chris George 994 pt Hyperlaun 5 Don Edberg 991 pt Quattro 6 Craig Foxgord 86 Pt original design 7 Larry Jolly 986 pt poly Two-Meter 8 Fred Weaver 983 pt Falcon 880 9 Brian Agnew 982 Pt Phoenix 10 Keith Kindrick 978 pt original design 1991 Masters may Florida Brian Agnew going check possible sites subject landing tasks continues expand suggestion half-circle used 100point spot would usual place up wind half would zero points may both half-circle runway will used next year SWSA club CD Pete Olsen de serve hearty Well done putting truly Masterful event Attention F3J enthusiasts case dont rec ognize term F3J new provisional FAI class Thermal Duration Gliding short notice first FAI-sanctioned F3J contest will BARCS-sponsored Interglide 1990 held Warwick England July 21-22 1990 have forgotten exact procedure must something like five contests least three countries competing before F3J will recognized world championship event FAI F3H class Cross-Country Glider flying has struggling requirement years may never get recognized opinion need F3J class addi tion F3B Multi-Task flying huge num ber pilots specialize Thermal flying can have opportunity get together recog nized FAI world championships event plan central England third week July please contact Sam Hitchman 7 Veiny Close Lighthorn Nr Warwick CV35 OAZ Eng land tel 0926-651511 will need nonBritish pilots make FAt-recognized Inter national event Wouldnt surprised might supply Glider tower get nonBritish entry tower thats pronounced tow-er reference pertains fact F3J rules specify hand towing 150-meter line Hand towing common method launching Britain unknown US Id appreciate someone experience hand towing would write order let us know its ins outs responding advertisers mention read about Model Aviation THE LEADER IN COMPETITION - SERIES 100 DIAPRICE 16 NEW 4 0 Ii NEW HIGH TECH AIRFOIL SECTION 10T020%INCREASE IN THRUST MFG OF SELECT HARD MAPLE WOOD WILL NOT FATIGUE LIKE SYNTHETICS FUEL PROOF HIGH LUSTER FINISH DIA PITCHPRICE 5/a34 634 72a33456 833456a 84S66/e7 94566/i77 1045667 106W8W 10SEW 114677/,778 115W 116EW 1l/u67 124W0 12SW0 1256 1356 1456 1556 164N 16678 RC PYLON RACING SERIES 500 DIA PITCHPRICE 75N 5/uH0 516776 SERIES 400C 86/o6t4777 977/t7 W WIDE BLADE EW EXTRA WIDE N NARROW July 1990 161 PROPELLERS CYCLE TAILORED HELICAL PITCH DEVELOPED TO GIVE MAXIMUM THRUST AT 4 CYCLE ENGINE RPM ALL THE LATEST TECHNIQUES USED ON OUR PRO SERIES 3 SEE BELOW PITCH THP 66/o778 677/e 8 677 8 67 678 PRO SERIES 3 LOW WING SHARKLT$9295 SHOULDER WING SHARKST5849a 0 65 Quel' SuIou & Hudwu SinPn-Built Jet U 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REALISTIC Weighs Less Hall Ounce. See Deuler No308 1/8 Scale s5O New Yoi State Outidenit No307 1/7 Scale s8% Add 7S ScanT U LJU EJ Ireii U DISIGNID DGVDLOPED IS CHRIS MACHE RICHMOND OUSTON TX 77056 FLY posvinnuas FUEL FROM KINGSWAY
Edition: Model Aviation - 1990/07
Page Numbers: 46, 47, 154, 155, 156, 157, 161
IVE READ Fred Flies Fred talking about Fred Weaver San Jose CA Fred third person achieve LSF Level V completing rigorous test 1976 John Baxter Steve Work got Level Vs 1975 Gliders equipment available days finishing Level V especially tough jobstill matter Fred three-time winner very popular prestigious Visalia Fall Soaring Festival win ning last year trusty Airtronics Cumic can appreciate credentials Fred has built up storehouse Soaring knowl edge uld wonderful burrow could So saw Fred Flies piece editor John Dvorak South Bay Soaring So ciety newsletter Silent Flyer knew fliers would want read Actually what John did transcribe talk Fred gave club meeting talk included much material questionand-answer type Johns report what Fred said figure Out lift some basic easy-to-understand things to plan before launch come off tow plane will either glide less straight rise sink turn way other Launching right lift won derful doesnt happen too often need know what other things occurs plane turns right itself indi cates lift left pushing plane away must steer opposite way plane wants go turning left get thermal Sink bad least indicates unstable air some mass air going up some other air coming down replace later straight normal glide no up/down bumps left/right turns bad news because indicates air probably stable no ther mals being generated thing case cruise planes best glide ratio try cover much ground possible look ing some kind lift What best lift generators Any dark surface such parking lots pavement rooftops done tar ything dark colored Dark surfaces absorb heat sun warm air adjacent sur rounding air mass warms sufficiently breaks free rises rising patch air pulls air immediate area replace Any dark surface next structures surfaces light colored will especially 46 Model Aviation Radio Conoi Soaring Byron Blakeslee 3134 N Winnebago Dr Sedalla Co 90135 Top placers Memphis Area Soaring Societys 1988 Fail Soaring Tournament LR Ron Stanfield Bob Sowder Neal Jacobs Bill Jenkins Dick Renakers Chip Gibbs Photo sent MASS president Bob Sowder looks like flew interesting mix designs Bernie Coleman Charlotte NC very nice quarter-scale LS-4 Rowing kit Aile ron servos built glass wings Rowing planes available through Tony Arnoux Look againl Thats really figurine posed front Bill Wynans beautiful Va-scale ASW 20 Kit available American Sailplane Designs San Diego CA realistic can get effective because difference surface tem peratures rural areas plowed ground next planted light-colored crops produces differences surface temperatures thus creates ther mals middle square mile asphalt would fewer thermals fringes would thermal activity because temperature difference effect What best search pattern use Tony Arnoux Miami FL 1 35-scale DG 202 Rake Modeile Germany Gor geous Sailplane features all-glass construc tion available through Tonys Imparts Co Tony has new catalog Scale Sailplanes See column information GOLDEN EDmON WE OFFER THE BEST HERES WHY 4 days covered w/good continuity Professional multi camera coverage Vast editing w/complete scenes Excellent narration & music Dynamic indoor showcase static dispiay Over 75 entries w/fuIl model & pilol reports Flighi analysis w/fuII size counterparts Reflections past masters events winners Banquei coverage w/awards & roasting ceremonies ENDORSED BY SCALE MASTERS BOARD SPONSORED BY h3 ER -K & B RUN TIMES APPROX 314 HRS TOTAL RETAIL PART 1 5995 PART 2 5495 SPECtAL ONLY 4795 / 4495 BOTh FOR ONLY 3705 SAVE 2700 XJU syria nt,j rat FOX DONT SETrLE FOR CHEAP SEMIPROFESSIONM COPIES GO WITH THE BEST ALL VIDEOS ON QUALITs MAXELL TAPE W/DELUXE CASES TO ZiNVITATIONAL TOURNAMENT OVER 14 HRS VALUED PRICED REG PR $4995 YOURS FOR ONLY $3995 BUY ANY 3 VIDEOS AT RETAIL PICK 4TH ONE FROM BELOW 11-71 FREE OTHER GREAT VIDEOS 1Airplane Funnies 30 mins3495 2Basic Conat Beginners 107 mins4195 31984 Scale Masters 60 mins3495 41987 Scale Masters 64 mins3995 51988 Scale Masters 90 mica2995 6Warhirds Action SO mins4495 7WhIch Way Up Aerobatirsl 70 mins4495 ORDERING Check MO Visa/Master Card Include phone no orders 350 Shippin 100 per extra No CODs nada res add6 tiotial others aJd 12% tiotal ACADEMY OF AVIATION R & D PO BOX 277 l Crest IL 60429 7083350776 Sales Final PRICES SUBJECT TO CHANGE WITH OUT NOTICE July 1990 47 Asher Charmichaci Mobile AL steadies 5-meter-wingspan 1A-scale SB 10 Rake kit available through Tony Arnoux Scale Nasfrr Continued page 154 1 iv utiucri Send $100 coupon address toADDRESS ar Ave ____________________________ ________ N NJ 07922CITYSTATEZIP L SPECIALISTSINCUSTOMCOX TEE DEE & REED ENGINES 020S 049S 051S 074S & 09S ALLCUSTOM&STOCKPARTS VAILABLE INDIWDUALL V COMPETITIONACCESSORIES RACING WHEELS KLOTZOIL CARBON FIBER SOLID LINES ALL KINDS OFFUEL TUBING THREE BRA NDSOFGLOWPL UGS HA RD-TO-FIND HA RD WARE OLD TIMER SUPPLIES COILS CONDENSERS NGK& STIlT SPARKPLUGS SILK8 COLORS QUA LITYDOPE BRUSHES 5& 7LOOP 1/4RUBBER BANDS TRANSISTORIGNITIONSYSTEMS RESISTOR HIGH TENSIONLEADS 1/2A TEXACO PLA YBOYSR KIT 1/2A TEXACO ENGINES & PARTS KSB & IGNITION TIMERS RUBBERPOWERKITS PROPS TISSUEAND OTHER SUPPLIES C VA NOA CR YLA TES & EPOXIES ORDER BY MAIL OR PHONE 619 7284365 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING HANDLING AND INSURANCE FEE $300 STOCK ORDERS SHIPPED WITHIN 24 HRS RC Scale/Aune Continued page 151 Equal C read 327 Therefore make 327-in circle piece aluminum cut pop can compass cut out scissors rough up underside 80-grit sandpaper glue fuselage us ing RC-56 glue Note will need measure calculate location panel well us ing same method have found great value Scale modeling has come result building flying per severing giving Rewards always lag behind effort life Happy building RC Soaring/Blakeslee Continued page 47 come off tow best cheat some already something scooting over best pattern pays know whats going air before launch Failing having other information lo cal hot spots observing birds bugs etc fly straight upwind watch see plane drifts right left drifting side whats happening plane being sucked some sink will likely thermal other side wing tip suddenly moves up edge thermal trick turn back toward thermal try find core go straight out cant find anything plane getting small hard see dont just turn around come straight back cause youll flying through same air just searched Go off side other circle back wind will help bring plane back What signs fly right middle thermal What youll see plane speeding up tail rising control re sponse improving Whenever see tail airplane go up know its lift Thats can give little rudder aileron pull back stick go Youre make tail Glider sensi tive lift center-of-gravity balance point should far rearward can fly ie Glider being prone stalling too squirrelly fly What happens sink plane becomes sluggish tail may drop slightly Never fly plane tail down Push nose down zip through body sink Something making air go down air somewhere around going up fly another hundred feet should lift Never circle sink never hold Up eleva tor sink its like putting brakes Up el evator does make Glider go uponly up air makes go up rule Speed up sink slow down lift Sink bad because dicates must thermal nearby have quickly fly through patch sink other side up air core thermal have use Glider identify boundaries ther mal paint mental picture what looks like After plane detects thermal dont im mediately start circling Fly straight think thermal until plane stops go ing up identifies other side ther mal Make turn back thermal upwind direction headed upwind sink encountered youve identified another bounda ry thermal So move turn downwind slightly get back thermal lower plane faster has done Low thermals small dont have much altitude play wind blowing 5 mph thermal also drifting speed higher get faster thermal will drift Winds higher altitudes usually stronger ground level As gain alti tude thermal becomes larger can open up turn make bigger circles Al ways drift toward side circle producing strongest lift should stay cored What plane high ther mal want find another thermal because getting too far downwind away field Dont head straight back upwind Thats sink feeding ther mal youre Instead head back upwind an gle left right wind direction What about launching sink ready launch wind picks up Thermal lift headed downwind know youll launching right sink 1 Quickly launch chase thermal downwind 2 Stand winch try zoom off angle next thermal 3 Come up servo problem Sandbagging option 3 unsportsmanlike decision have make hurry based fast thermal moving what kind plane youre flying Gentle Lady 154 Model Aviation SUNBIRD SENSATION WITH STYLE Sunbird combines eye opening performance truly distinctive styling terrific flying design Whether choose 40 size Sunbird 10 Sunbird Jr youll find Sunbird perfect sport plane %fl PRECISION PRODUCTS INC 714 592-5144 510 E Arrow Highway San Dimas CA 91773 JUN lIt V-UIIVVtIVI LJIf V VERA GES OVER 9000 PROPS I! IMMEDIA TESHIPMENTON WSA/MC summer 1940 Jim Walker introduced A-J Fireball U-Control world Countless thousands got first taste model aviation excitement building flying famous airplane commemorate 50th Anniversary birth A-J Fireball proudly announce special limited-edition kit Jim Walkers 1940 original kit contains U fully carved Balsa fusealage Balsa wing tail parts cut shape U hardware hardwood motor mount U decals U complete instructions illustrations U brief history A-J Fireball Offered limited edition 50th Anniversary A-J Fireball numbered dated signed just like kits first produced 1940 can make 60 kits available per month order yours TODAY YES Enclosed check money order $17950 YES cant decide Please send information A-J Manutacturing Inc PO Box68132 Portland OR 97268 503 653-2038 CAN ib 40 fj M* % going zoom So its best have understand ing options prior stepping up winch dont want waste time deciding what greatest thing world being ready launch having gentle breeze come up behind Its wrong direction means downwind launchbut will directly thermal What has happened breeze feel air feeding thermal just front Rule sudden shift direction breeze indicates local thermal present breeze blowing toward thermal What wave action Sometimes windy days youll find fixed ridge wave lift Making S-turns back forth along wave will sustain flight lift plane higher altitudes lift acts like slope lift created wind bounces off side hill may hang out 20 minutes sud den disappear Wave lift may caused sur face features upwind difference temperature layers pressure tree line get good spot landings things guarantees spot landings making same approach single time first thing figure out land plane spot means practicing downwind ap proach turn wind final glide straight spot As wind picks up can shorten downwind leg turn soon er Onto final approach spot sky start downwind leg can thought Initial Point IP Another trick stick plane thats easy fly Polyhedral ships like Oly II Para gon Gemini easy fly Stick same plane keep flying Dont switch air planes Practice landing approach al ways make same approach Youll landing either too short too long learn make proper compensations watch can come land spot time after time after time What about timed landings next step af ter learning make spot landings learn land against watch easiest way have buddy time landing approach IP Once know distance terms time have position normal airspeed time dont need watch So timer will quiet can make normal approach concentrate making 100-point spot landing within couple seconds target time newer airplanes have higher wing loadings have flaps crow Editors note Crow refers Gliders configuration flaps fully extended Down ai lerons fidly extended Up RMcM timed approach can fun because can adjust conditions cheat watch Come high approach fair amount time left watch wont gam bling poor landing because low altitude encountering sink Govern time speed flaps crow elevator youll get time Cross-Country better start high search thermals course Some pilots will fly high can before entering course Others will enter course much sooner search lift along way Continued old timer perfectly proportioned modeling Curtiss Robin 049 EngInes -Channel R/C 41 Wingspan Electric Power Optional $2255 0 Very few full scale ajcraff Ideally soiled model flishf Cs l5 fhe appealing old Curfiss Robin born spruce linen age beautifully proportioned rubber elecfric glow engines Easy end fun build trainerlike performance Flyline Models Cafalog hOt Phono 17031 2739593 INE MODELS INC PO Boa 2136 Faintac VIrginia 22031 USA July 1990 155 w 18 I . 0 G - 4WWaL&ez II b luni your pnaler isIs airfoil plstler FOILED AGAIN! C PLOT AIRFOILS IN ANY CHORD UP TO 24 INCHES MODIFY THICKNESS CAMBER & TRAILING EDGE PLOT SKIN THICKNESS FOR SHEETED WINGS ENTER DATA EASILY 'IA INTELUGENr EDITOR UsER-FRIENDLY MENU-DRIVEN OPERATION INCLUDES Il-PAGE ILLUSTRATED USER MANUAL $4500 naraauaai COok afl ussno~4 asquIas I5MPClflAT uaoo551n.O comma anO Ca mama p0,w Olas oamourC 000r yp Caatas iowan SOS a5 daha Sins atom aaao 00 CYGNET Software714 496-6961 24843 Del Prado #t4lB Dana Point CA 92629 FOAMAIRE 74 IN WING SPAN 6-7 LBS 45-60 POWER 4 OH PLY FOAM AND BALSA WOOD KIT $6995 SEND $100 FOR CATALOGcART 1 NEODESHA KS 66757 OF SAC KITS AND ACC316 325-2821 FREE SHIPPING ON KIT ORDERSISAASTERCARD part country its easy at-newsletter think youll enjoy way ex- density viscosity air unchange tam high altitude hut around Taft CA high al-plains some technical stuffable design purposes titude can achieved quickly Around think wasting time get real high Ofttimes sit listen Hot Shoes talk Rn 6360 x Velocity ft/sec just go Just get up decently high thenabout what should shorten bubble x Length chord ft get goinglengthen transition Guess what Theyre talkSet course wind toward youring about model Gliders Now dont take reference 88 ft/sec ph 44 destination Youll need plane can trim andSo got out Martin Simons book Model Air-30 22 o Glider 10-in-chord just let fly like Paragon big Sagitta Youcraft Aerodynamics published Argus Bookswing flying 30 mph produces Rn cant have plane have fly timeBB Ed Old gave helping233000 will give Reynolds number have able adjust trims let itwhile president new Soartech #8compatible polars find tech manuals go have have ship will thermalthat Herk Stokely sent Princeton pa- Visualize Sand surface wing really easily decide itper Three Amigos sent back 1985air molecules Count grains wing information floating around Iover period time grains er Thanks go Fred Weaver John Dvorakshould able pop bubbles best ofcloser come flying like real airplane letting us pass along great tips Pleasethemless scale effect can count let know would like see Reading through stuff once prettygrains wing increasing speed instructional-type materialdry Oh occasion discussion would livenchord Comprendo up little plane would stall could new catalog Scale ldts available fromsee spinning out sky minds eye 0 Boundary layer area between airTony Amoux Miami Tonys catalog includesThe excitement would build direct proportionfoil surface point above below wing about dozen mostly quarter-scale-size Sail-to Reynolds number overall after asurface air has affected planes German makers Roke Rowingcouple hours Id lose interest chap-passage wing Wik Gliders fly beautifully areters would spaced over few months say top quality Alto included catalog anothing books best way study nar boundary layer visualize page two goodies appeal Scale enthus-and retain informationMany sheets thin paper stacked layer upon iasts Send $4 check refundable order think its time put informa-layer above wing layer moving Imparts Inc. 1736 NW 82 Ave Miami FLtion very consolidated form something likeslower relation wing above 33126Go rebuild later necessary thinkit until closest layer surface moving Competitors F3B should note Tonysit best start Out list definitions withat same speed wing Same hotreal business importing German auto partsthe terms defined rational ordertom surface low-drag condition good source legal Bosch winch ear progresses might stick somepreferable turbulent layerexcept motorsat much lower list prices Write formore high-tech stuff iffin yall dont laughfact laminar flow separates sooner reat detailsat way think about stuff like thistaches much later positive laminar flow low drag What heck guy talking about olds numberhigher efficiency following article Chuck Griswald appeared negative ease will de Thousand Oaks Soaring Society newslet- Air Density/Viscosity x Velocitytach surface difficulty getting ter TOSS-Up Chuck editor fine ngthit reattach PreBuilt MV-i Typhoon * Designed Ron Chidgey * 100% Gator R/O Products Components wing/stab tubes & adjusters canopy & cowl HIGH QUALITY *100% built up construction precision ~g5 ULTRA SWITCH HARNESS * Bob Violetts Magnalite GB 125 used Gold contacts inside switch formersAJI connectoss manufactured * Satisfaction GuaranteedbyFutaba Positive lock Mounting simply requires dnll Thousand sq inWOODORAINS INCing 114 inch hole 100% tested Model Now Available 9 BOX 122Custom cable lengths availble Cumming GA 30130upon request minimal cost 404-889-4758ULTRA SWITCH HARNESS $1995 Tim Megan Richardson PLUS $250 PLUS $600SHIPPING & HANDLING SHIPPING & HANDLINGGa Residents Add 6% Sales Tax 156 Model Aviation E 10 SPAN 30-33 LBS 50-75CC POWER 5-10 LB PAYLOAD OPTIONAL SPREADER KIT $26995 SPDKiT$1995 TRAINER 10 SPAN 19-22 LBS 35-42CC POWER CHOOSE 3 OR 4 OH SLOW AND STABLE 3 CH $14995 4 CH $16495 rOISCOVER HOW GOOD FLYING REALLY CAN BE EAA flying its very best Whether youre pilot builder simply enjoy airplanes EAA Once youve joined become integral part aviations dynamic group EAA can organizationis recognized internationally newsmaker aviation today. pushing cutting edge sport aviation technology new exciting limits adventure can experience others share passion flying JOIN EAA JOIN TODAY $35 ANNUALLY call EAAs TOLL FREE MEMBERSHIP HOTLINE d 4O Major credit cards accepted Something Everyone 0 SPORT AVIATION authoritative monthly magazine . recognized worlds finest aviation publications 0 Three special Divisions interested specific aircraft Antique/Classic AC Aerobatic Warbirds 0 EXPERIMENTER hly publication homebuilding light plane ultralight enthusiasts 0 An extensive chapter network active 700 local areas 0 EAA Technical counselors advise construction projects 0 EAA Family Memberships 0 Specialized aviation insurance coverege 0 EAA Mastercard Gold MasterCard programs S e Bubbles boundary layer becomes de tached usually lower-pressure regions know thickest part wingthe part lift produced Visualize lift pulling sheets paper off surface high point reattaching near trailing edge stagnant area called bubble creases drag dramatically Its just like gluing hunk balsa top wing air mol ecules dont move off wing area As angle attack continues increase after bubble has formed bubble breaks bound ary layer cannot reattach stall occurs e Attached boundary layer stays surface parallel e Detached boundary layer becomes sep arated surface wing bound ary layer may become detached point reattach itself forming bubble may never reattach causing very high drag pos sibly stall s turbulent boundary layer visualize Very fine sand tumbling grain over grain along length airfoil Its rolling motion always thicker laminar flow positive turbulent flow sticks surface longer harder detach com pletely surface negative higher drag laminar flow sition zone area bound ary layer goes laminar turbulentor flow detaches completely Ramps designed airfoils help boundary layer stay attached help reattach af o Hysteresis defined physics fail ure property changed external agent return its original value cause change removed For high-lift hysteresis Princeton papers visualize An airfoil increasing its angle attack AQA point right before stall Mark point mind Now increase AQA just bit get stall Now recover As de crease AOA airfoil must drop below mark minds eye before has recovered again flying high-lift hysteresis leading edge stall bubble breaks right leading edge For moderate-lift hysteresis visualize An airfoil increasing its AQA first did Before reaches stall point seems slow down drag increases would swear someone deployed spoilers al though continue pull Up trim starts look promising AOA increases slightly flying again little Up trim its stall time Just first example old bubble formed time reattached toward trail ing edgea long bubble cause highdrag condition increased AOA trailing edge bubble started forward again drag decreased Now since little good bit must better Wrong Back high-lift hysteresis leading edge stall would anyone fly plane like have flown Gliders use E-205 airfoila Sagitta exam ple Did anyone say Hey buddy got fly plane fastget step someone thought Maybe put turbulator strip dont have scream around sky Hes right turbulator strip explained next paragraph RMcM course idea Eppler airfoils keep laminar longer cut down drag Well best-laid plans etc e Turbulators trip up laminar flow start sand rolling over surface wing raises drag bit keeps boundary layer surface longer keeps dreaded bubble forming soon full-size aircraft flow seldom lami nar Reynolds numbers high panel line rivet will start turbulent flow RC Gliders Rns below million air appears viscous therefore remains lam inar over larger imperfections turbulate wing apiece trim tape 0010 thick / wide will usually trick OK havent bored tears think about Its going take think up some high-tech stuff just listened CO Top Gun Squadron Miramar try explain G forces TV program Wings dont feel bad Just scream holler cant take promise stop Dont stop Chuck often takes different slant technical explanations before light bulb goes know enjoyed reading Continued page 161 July 1990 157 Full participation EAAs famous OSHKOSH Fly-In Convention many benefits Get full story. ter bubble has formed low Rns like ramps designed cover upper surface airfoil dont look chances wont find RC Soaring/Blakeslee Continued page 157 Chuck Griswalds visualizations hope helped some readers understand what Hot Shoes arc talking about Masters Soaring contest very presti gious because limited fliers having outstanding qualifications Only LSF Level IVs Vs Nats winners eligible Mas ters cosponsored National Soaring Soci ety NSS President Pete Carr kindly sent report March 1990 Masters Soaring contest hosted Silent Wings Soaring Associa tion SWSA West Covina CA directed Pete Olsen site school mid dle town surrounded homes hospital factories Launch equipment Rahm winches retrievers very snappy worked flawlessly during 14 rounds Pete last years Masters CD Myles Mo ran came up mix flight times land ing tasks really tested pilots first landing task runway four feet wide 20 feet long divided five squares point values 20 30 40 30 20 other landing used standard 25-foot tape 100-point max cases runway land ing eliminated loud landings mentioned 89 report Winds calm time light easy-to-find lift Notable among entrants Brian Ag new age 24 Florida flying Ed Bertons new 35-meter Phoenix kits ATRCS-modified Airtronics Module radio early rounds Don Edberg fought lead few points apart Joe Wurts close behind flying Falcon 880 Three pilots flew hot new Mark Allen Falcon con test including eventual winner Bob McGowan northern California nine Air tronics Vision radios use several ATRCS-modified 7SPs making Airtronics RF link choice Masters three Geminis two Paragons flown both ing Ed Slobod designs two crashes during contest Rich Garners Larry Jolly Model Products Chee tah broke elevator pushrod zoom destroyed wing uses balsa ribs full balsa sheeting displayed amazing strength spite terrible flutter set up stab other crash saw Brian Agnews Phoenix tuck inverted dive altitude 100 ft circling landing pattern last round appeared airborne battery failed since little warning trouble Brian Phoenix made impressive show ing finished ninth place spite zero last landing top 10 1 Bob McGowan 1000 Pt Falcon 880 2 Terry Koplan 997 Pt Vi king 3 Joe Wurts 996 pt Falcon 880 4 Chris George 994 pt Hyperlaun 5 Don Edberg 991 pt Quattro 6 Craig Foxgord 86 Pt original design 7 Larry Jolly 986 pt poly Two-Meter 8 Fred Weaver 983 pt Falcon 880 9 Brian Agnew 982 Pt Phoenix 10 Keith Kindrick 978 pt original design 1991 Masters may Florida Brian Agnew going check possible sites subject landing tasks continues expand suggestion half-circle used 100point spot would usual place up wind half would zero points may both half-circle runway will used next year SWSA club CD Pete Olsen de serve hearty Well done putting truly Masterful event Attention F3J enthusiasts case dont rec ognize term F3J new provisional FAI class Thermal Duration Gliding short notice first FAI-sanctioned F3J contest will BARCS-sponsored Interglide 1990 held Warwick England July 21-22 1990 have forgotten exact procedure must something like five contests least three countries competing before F3J will recognized world championship event FAI F3H class Cross-Country Glider flying has struggling requirement years may never get recognized opinion need F3J class addi tion F3B Multi-Task flying huge num ber pilots specialize Thermal flying can have opportunity get together recog nized FAI world championships event plan central England third week July please contact Sam Hitchman 7 Veiny Close Lighthorn Nr Warwick CV35 OAZ Eng land tel 0926-651511 will need nonBritish pilots make FAt-recognized Inter national event Wouldnt surprised might supply Glider tower get nonBritish entry tower thats pronounced tow-er reference pertains fact F3J rules specify hand towing 150-meter line Hand towing common method launching Britain unknown US Id appreciate someone experience hand towing would write order let us know its ins outs responding advertisers mention read about Model Aviation THE LEADER IN COMPETITION - SERIES 100 DIAPRICE 16 NEW 4 0 Ii NEW HIGH TECH AIRFOIL SECTION 10T020%INCREASE IN THRUST MFG OF SELECT HARD MAPLE WOOD WILL NOT FATIGUE LIKE SYNTHETICS FUEL PROOF HIGH LUSTER FINISH DIA PITCHPRICE 5/a34 634 72a33456 833456a 84S66/e7 94566/i77 1045667 106W8W 10SEW 114677/,778 115W 116EW 1l/u67 124W0 12SW0 1256 1356 1456 1556 164N 16678 RC PYLON RACING SERIES 500 DIA PITCHPRICE 75N 5/uH0 516776 SERIES 400C 86/o6t4777 977/t7 W WIDE BLADE EW EXTRA WIDE N NARROW July 1990 161 PROPELLERS CYCLE TAILORED HELICAL PITCH DEVELOPED TO GIVE MAXIMUM THRUST AT 4 CYCLE ENGINE RPM ALL THE LATEST TECHNIQUES USED ON OUR PRO SERIES 3 SEE BELOW PITCH THP 66/o778 677/e 8 677 8 67 678 PRO SERIES 3 LOW WING SHARKLT$9295 SHOULDER WING SHARKST5849a 0 65 Quel' SuIou & Hudwu SinPn-Built Jet U Lightest Pilot PILOT BUST has Modern Jet Helmet Face Mask Oxygen ... REALISTIC Weighs Less Hall Ounce. See Deuler No308 1/8 Scale s5O New Yoi State Outidenit No307 1/7 Scale s8% Add 7S ScanT U LJU EJ Ireii U DISIGNID DGVDLOPED IS CHRIS MACHE RICHMOND OUSTON TX 77056 FLY posvinnuas FUEL FROM KINGSWAY
Edition: Model Aviation - 1990/07
Page Numbers: 46, 47, 154, 155, 156, 157, 161
IVE READ Fred Flies Fred talking about Fred Weaver San Jose CA Fred third person achieve LSF Level V completing rigorous test 1976 John Baxter Steve Work got Level Vs 1975 Gliders equipment available days finishing Level V especially tough jobstill matter Fred three-time winner very popular prestigious Visalia Fall Soaring Festival win ning last year trusty Airtronics Cumic can appreciate credentials Fred has built up storehouse Soaring knowl edge uld wonderful burrow could So saw Fred Flies piece editor John Dvorak South Bay Soaring So ciety newsletter Silent Flyer knew fliers would want read Actually what John did transcribe talk Fred gave club meeting talk included much material questionand-answer type Johns report what Fred said figure Out lift some basic easy-to-understand things to plan before launch come off tow plane will either glide less straight rise sink turn way other Launching right lift won derful doesnt happen too often need know what other things occurs plane turns right itself indi cates lift left pushing plane away must steer opposite way plane wants go turning left get thermal Sink bad least indicates unstable air some mass air going up some other air coming down replace later straight normal glide no up/down bumps left/right turns bad news because indicates air probably stable no ther mals being generated thing case cruise planes best glide ratio try cover much ground possible look ing some kind lift What best lift generators Any dark surface such parking lots pavement rooftops done tar ything dark colored Dark surfaces absorb heat sun warm air adjacent sur rounding air mass warms sufficiently breaks free rises rising patch air pulls air immediate area replace Any dark surface next structures surfaces light colored will especially 46 Model Aviation Radio Conoi Soaring Byron Blakeslee 3134 N Winnebago Dr Sedalla Co 90135 Top placers Memphis Area Soaring Societys 1988 Fail Soaring Tournament LR Ron Stanfield Bob Sowder Neal Jacobs Bill Jenkins Dick Renakers Chip Gibbs Photo sent MASS president Bob Sowder looks like flew interesting mix designs Bernie Coleman Charlotte NC very nice quarter-scale LS-4 Rowing kit Aile ron servos built glass wings Rowing planes available through Tony Arnoux Look againl Thats really figurine posed front Bill Wynans beautiful Va-scale ASW 20 Kit available American Sailplane Designs San Diego CA realistic can get effective because difference surface tem peratures rural areas plowed ground next planted light-colored crops produces differences surface temperatures thus creates ther mals middle square mile asphalt would fewer thermals fringes would thermal activity because temperature difference effect What best search pattern use Tony Arnoux Miami FL 1 35-scale DG 202 Rake Modeile Germany Gor geous Sailplane features all-glass construc tion available through Tonys Imparts Co Tony has new catalog Scale Sailplanes See column information GOLDEN EDmON WE OFFER THE BEST HERES WHY 4 days covered w/good continuity Professional multi camera coverage Vast editing w/complete scenes Excellent narration & music Dynamic indoor showcase static dispiay Over 75 entries w/fuIl model & pilol reports Flighi analysis w/fuII size counterparts Reflections past masters events winners Banquei coverage w/awards & roasting ceremonies ENDORSED BY SCALE MASTERS BOARD SPONSORED BY h3 ER -K & B RUN TIMES APPROX 314 HRS TOTAL RETAIL PART 1 5995 PART 2 5495 SPECtAL ONLY 4795 / 4495 BOTh FOR ONLY 3705 SAVE 2700 XJU syria nt,j rat FOX DONT SETrLE FOR CHEAP SEMIPROFESSIONM COPIES GO WITH THE BEST ALL VIDEOS ON QUALITs MAXELL TAPE W/DELUXE CASES TO ZiNVITATIONAL TOURNAMENT OVER 14 HRS VALUED PRICED REG PR $4995 YOURS FOR ONLY $3995 BUY ANY 3 VIDEOS AT RETAIL PICK 4TH ONE FROM BELOW 11-71 FREE OTHER GREAT VIDEOS 1Airplane Funnies 30 mins3495 2Basic Conat Beginners 107 mins4195 31984 Scale Masters 60 mins3495 41987 Scale Masters 64 mins3995 51988 Scale Masters 90 mica2995 6Warhirds Action SO mins4495 7WhIch Way Up Aerobatirsl 70 mins4495 ORDERING Check MO Visa/Master Card Include phone no orders 350 Shippin 100 per extra No CODs nada res add6 tiotial others aJd 12% tiotal ACADEMY OF AVIATION R & D PO BOX 277 l Crest IL 60429 7083350776 Sales Final PRICES SUBJECT TO CHANGE WITH OUT NOTICE July 1990 47 Asher Charmichaci Mobile AL steadies 5-meter-wingspan 1A-scale SB 10 Rake kit available through Tony Arnoux Scale Nasfrr Continued page 154 1 iv utiucri Send $100 coupon address toADDRESS ar Ave ____________________________ ________ N NJ 07922CITYSTATEZIP L SPECIALISTSINCUSTOMCOX TEE DEE & REED ENGINES 020S 049S 051S 074S & 09S ALLCUSTOM&STOCKPARTS VAILABLE INDIWDUALL V COMPETITIONACCESSORIES RACING WHEELS KLOTZOIL CARBON FIBER SOLID LINES ALL KINDS OFFUEL TUBING THREE BRA NDSOFGLOWPL UGS HA RD-TO-FIND HA RD WARE OLD TIMER SUPPLIES COILS CONDENSERS NGK& STIlT SPARKPLUGS SILK8 COLORS QUA LITYDOPE BRUSHES 5& 7LOOP 1/4RUBBER BANDS TRANSISTORIGNITIONSYSTEMS RESISTOR HIGH TENSIONLEADS 1/2A TEXACO PLA YBOYSR KIT 1/2A TEXACO ENGINES & PARTS KSB & IGNITION TIMERS RUBBERPOWERKITS PROPS TISSUEAND OTHER SUPPLIES C VA NOA CR YLA TES & EPOXIES ORDER BY MAIL OR PHONE 619 7284365 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING HANDLING AND INSURANCE FEE $300 STOCK ORDERS SHIPPED WITHIN 24 HRS RC Scale/Aune Continued page 151 Equal C read 327 Therefore make 327-in circle piece aluminum cut pop can compass cut out scissors rough up underside 80-grit sandpaper glue fuselage us ing RC-56 glue Note will need measure calculate location panel well us ing same method have found great value Scale modeling has come result building flying per severing giving Rewards always lag behind effort life Happy building RC Soaring/Blakeslee Continued page 47 come off tow best cheat some already something scooting over best pattern pays know whats going air before launch Failing having other information lo cal hot spots observing birds bugs etc fly straight upwind watch see plane drifts right left drifting side whats happening plane being sucked some sink will likely thermal other side wing tip suddenly moves up edge thermal trick turn back toward thermal try find core go straight out cant find anything plane getting small hard see dont just turn around come straight back cause youll flying through same air just searched Go off side other circle back wind will help bring plane back What signs fly right middle thermal What youll see plane speeding up tail rising control re sponse improving Whenever see tail airplane go up know its lift Thats can give little rudder aileron pull back stick go Youre make tail Glider sensi tive lift center-of-gravity balance point should far rearward can fly ie Glider being prone stalling too squirrelly fly What happens sink plane becomes sluggish tail may drop slightly Never fly plane tail down Push nose down zip through body sink Something making air go down air somewhere around going up fly another hundred feet should lift Never circle sink never hold Up eleva tor sink its like putting brakes Up el evator does make Glider go uponly up air makes go up rule Speed up sink slow down lift Sink bad because dicates must thermal nearby have quickly fly through patch sink other side up air core thermal have use Glider identify boundaries ther mal paint mental picture what looks like After plane detects thermal dont im mediately start circling Fly straight think thermal until plane stops go ing up identifies other side ther mal Make turn back thermal upwind direction headed upwind sink encountered youve identified another bounda ry thermal So move turn downwind slightly get back thermal lower plane faster has done Low thermals small dont have much altitude play wind blowing 5 mph thermal also drifting speed higher get faster thermal will drift Winds higher altitudes usually stronger ground level As gain alti tude thermal becomes larger can open up turn make bigger circles Al ways drift toward side circle producing strongest lift should stay cored What plane high ther mal want find another thermal because getting too far downwind away field Dont head straight back upwind Thats sink feeding ther mal youre Instead head back upwind an gle left right wind direction What about launching sink ready launch wind picks up Thermal lift headed downwind know youll launching right sink 1 Quickly launch chase thermal downwind 2 Stand winch try zoom off angle next thermal 3 Come up servo problem Sandbagging option 3 unsportsmanlike decision have make hurry based fast thermal moving what kind plane youre flying Gentle Lady 154 Model Aviation SUNBIRD SENSATION WITH STYLE Sunbird combines eye opening performance truly distinctive styling terrific flying design Whether choose 40 size Sunbird 10 Sunbird Jr youll find Sunbird perfect sport plane %fl PRECISION PRODUCTS INC 714 592-5144 510 E Arrow Highway San Dimas CA 91773 JUN lIt V-UIIVVtIVI LJIf V VERA GES OVER 9000 PROPS I! IMMEDIA TESHIPMENTON WSA/MC summer 1940 Jim Walker introduced A-J Fireball U-Control world Countless thousands got first taste model aviation excitement building flying famous airplane commemorate 50th Anniversary birth A-J Fireball proudly announce special limited-edition kit Jim Walkers 1940 original kit contains U fully carved Balsa fusealage Balsa wing tail parts cut shape U hardware hardwood motor mount U decals U complete instructions illustrations U brief history A-J Fireball Offered limited edition 50th Anniversary A-J Fireball numbered dated signed just like kits first produced 1940 can make 60 kits available per month order yours TODAY YES Enclosed check money order $17950 YES cant decide Please send information A-J Manutacturing Inc PO Box68132 Portland OR 97268 503 653-2038 CAN ib 40 fj M* % going zoom So its best have understand ing options prior stepping up winch dont want waste time deciding what greatest thing world being ready launch having gentle breeze come up behind Its wrong direction means downwind launchbut will directly thermal What has happened breeze feel air feeding thermal just front Rule sudden shift direction breeze indicates local thermal present breeze blowing toward thermal What wave action Sometimes windy days youll find fixed ridge wave lift Making S-turns back forth along wave will sustain flight lift plane higher altitudes lift acts like slope lift created wind bounces off side hill may hang out 20 minutes sud den disappear Wave lift may caused sur face features upwind difference temperature layers pressure tree line get good spot landings things guarantees spot landings making same approach single time first thing figure out land plane spot means practicing downwind ap proach turn wind final glide straight spot As wind picks up can shorten downwind leg turn soon er Onto final approach spot sky start downwind leg can thought Initial Point IP Another trick stick plane thats easy fly Polyhedral ships like Oly II Para gon Gemini easy fly Stick same plane keep flying Dont switch air planes Practice landing approach al ways make same approach Youll landing either too short too long learn make proper compensations watch can come land spot time after time after time What about timed landings next step af ter learning make spot landings learn land against watch easiest way have buddy time landing approach IP Once know distance terms time have position normal airspeed time dont need watch So timer will quiet can make normal approach concentrate making 100-point spot landing within couple seconds target time newer airplanes have higher wing loadings have flaps crow Editors note Crow refers Gliders configuration flaps fully extended Down ai lerons fidly extended Up RMcM timed approach can fun because can adjust conditions cheat watch Come high approach fair amount time left watch wont gam bling poor landing because low altitude encountering sink Govern time speed flaps crow elevator youll get time Cross-Country better start high search thermals course Some pilots will fly high can before entering course Others will enter course much sooner search lift along way Continued old timer perfectly proportioned modeling Curtiss Robin 049 EngInes -Channel R/C 41 Wingspan Electric Power Optional $2255 0 Very few full scale ajcraff Ideally soiled model flishf Cs l5 fhe appealing old Curfiss Robin born spruce linen age beautifully proportioned rubber elecfric glow engines Easy end fun build trainerlike performance Flyline Models Cafalog hOt Phono 17031 2739593 INE MODELS INC PO Boa 2136 Faintac VIrginia 22031 USA July 1990 155 w 18 I . 0 G - 4WWaL&ez II b luni your pnaler isIs airfoil plstler FOILED AGAIN! C PLOT AIRFOILS IN ANY CHORD UP TO 24 INCHES MODIFY THICKNESS CAMBER & TRAILING EDGE PLOT SKIN THICKNESS FOR SHEETED WINGS ENTER DATA EASILY 'IA INTELUGENr EDITOR UsER-FRIENDLY MENU-DRIVEN OPERATION INCLUDES Il-PAGE ILLUSTRATED USER MANUAL $4500 naraauaai COok afl ussno~4 asquIas I5MPClflAT uaoo551n.O comma anO Ca mama p0,w Olas oamourC 000r yp Caatas iowan SOS a5 daha Sins atom aaao 00 CYGNET Software714 496-6961 24843 Del Prado #t4lB Dana Point CA 92629 FOAMAIRE 74 IN WING SPAN 6-7 LBS 45-60 POWER 4 OH PLY FOAM AND BALSA WOOD KIT $6995 SEND $100 FOR CATALOGcART 1 NEODESHA KS 66757 OF SAC KITS AND ACC316 325-2821 FREE SHIPPING ON KIT ORDERSISAASTERCARD part country its easy at-newsletter think youll enjoy way ex- density viscosity air unchange tam high altitude hut around Taft CA high al-plains some technical stuffable design purposes titude can achieved quickly Around think wasting time get real high Ofttimes sit listen Hot Shoes talk Rn 6360 x Velocity ft/sec just go Just get up decently high thenabout what should shorten bubble x Length chord ft get goinglengthen transition Guess what Theyre talkSet course wind toward youring about model Gliders Now dont take reference 88 ft/sec ph 44 destination Youll need plane can trim andSo got out Martin Simons book Model Air-30 22 o Glider 10-in-chord just let fly like Paragon big Sagitta Youcraft Aerodynamics published Argus Bookswing flying 30 mph produces Rn cant have plane have fly timeBB Ed Old gave helping233000 will give Reynolds number have able adjust trims let itwhile president new Soartech #8compatible polars find tech manuals go have have ship will thermalthat Herk Stokely sent Princeton pa- Visualize Sand surface wing really easily decide itper Three Amigos sent back 1985air molecules Count grains wing information floating around Iover period time grains er Thanks go Fred Weaver John Dvorakshould able pop bubbles best ofcloser come flying like real airplane letting us pass along great tips Pleasethemless scale effect can count let know would like see Reading through stuff once prettygrains wing increasing speed instructional-type materialdry Oh occasion discussion would livenchord Comprendo up little plane would stall could new catalog Scale ldts available fromsee spinning out sky minds eye 0 Boundary layer area between airTony Amoux Miami Tonys catalog includesThe excitement would build direct proportionfoil surface point above below wing about dozen mostly quarter-scale-size Sail-to Reynolds number overall after asurface air has affected planes German makers Roke Rowingcouple hours Id lose interest chap-passage wing Wik Gliders fly beautifully areters would spaced over few months say top quality Alto included catalog anothing books best way study nar boundary layer visualize page two goodies appeal Scale enthus-and retain informationMany sheets thin paper stacked layer upon iasts Send $4 check refundable order think its time put informa-layer above wing layer moving Imparts Inc. 1736 NW 82 Ave Miami FLtion very consolidated form something likeslower relation wing above 33126Go rebuild later necessary thinkit until closest layer surface moving Competitors F3B should note Tonysit best start Out list definitions withat same speed wing Same hotreal business importing German auto partsthe terms defined rational ordertom surface low-drag condition good source legal Bosch winch ear progresses might stick somepreferable turbulent layerexcept motorsat much lower list prices Write formore high-tech stuff iffin yall dont laughfact laminar flow separates sooner reat detailsat way think about stuff like thistaches much later positive laminar flow low drag What heck guy talking about olds numberhigher efficiency following article Chuck Griswald appeared negative ease will de Thousand Oaks Soaring Society newslet- Air Density/Viscosity x Velocitytach surface difficulty getting ter TOSS-Up Chuck editor fine ngthit reattach PreBuilt MV-i Typhoon * Designed Ron Chidgey * 100% Gator R/O Products Components wing/stab tubes & adjusters canopy & cowl HIGH QUALITY *100% built up construction precision ~g5 ULTRA SWITCH HARNESS * Bob Violetts Magnalite GB 125 used Gold contacts inside switch formersAJI connectoss manufactured * Satisfaction GuaranteedbyFutaba Positive lock Mounting simply requires dnll Thousand sq inWOODORAINS INCing 114 inch hole 100% tested Model Now Available 9 BOX 122Custom cable lengths availble Cumming GA 30130upon request minimal cost 404-889-4758ULTRA SWITCH HARNESS $1995 Tim Megan Richardson PLUS $250 PLUS $600SHIPPING & HANDLING SHIPPING & HANDLINGGa Residents Add 6% Sales Tax 156 Model Aviation E 10 SPAN 30-33 LBS 50-75CC POWER 5-10 LB PAYLOAD OPTIONAL SPREADER KIT $26995 SPDKiT$1995 TRAINER 10 SPAN 19-22 LBS 35-42CC POWER CHOOSE 3 OR 4 OH SLOW AND STABLE 3 CH $14995 4 CH $16495 rOISCOVER HOW GOOD FLYING REALLY CAN BE EAA flying its very best Whether youre pilot builder simply enjoy airplanes EAA Once youve joined become integral part aviations dynamic group EAA can organizationis recognized internationally newsmaker aviation today. pushing cutting edge sport aviation technology new exciting limits adventure can experience others share passion flying JOIN EAA JOIN TODAY $35 ANNUALLY call EAAs TOLL FREE MEMBERSHIP HOTLINE d 4O Major credit cards accepted Something Everyone 0 SPORT AVIATION authoritative monthly magazine . recognized worlds finest aviation publications 0 Three special Divisions interested specific aircraft Antique/Classic AC Aerobatic Warbirds 0 EXPERIMENTER hly publication homebuilding light plane ultralight enthusiasts 0 An extensive chapter network active 700 local areas 0 EAA Technical counselors advise construction projects 0 EAA Family Memberships 0 Specialized aviation insurance coverege 0 EAA Mastercard Gold MasterCard programs S e Bubbles boundary layer becomes de tached usually lower-pressure regions know thickest part wingthe part lift produced Visualize lift pulling sheets paper off surface high point reattaching near trailing edge stagnant area called bubble creases drag dramatically Its just like gluing hunk balsa top wing air mol ecules dont move off wing area As angle attack continues increase after bubble has formed bubble breaks bound ary layer cannot reattach stall occurs e Attached boundary layer stays surface parallel e Detached boundary layer becomes sep arated surface wing bound ary layer may become detached point reattach itself forming bubble may never reattach causing very high drag pos sibly stall s turbulent boundary layer visualize Very fine sand tumbling grain over grain along length airfoil Its rolling motion always thicker laminar flow positive turbulent flow sticks surface longer harder detach com pletely surface negative higher drag laminar flow sition zone area bound ary layer goes laminar turbulentor flow detaches completely Ramps designed airfoils help boundary layer stay attached help reattach af o Hysteresis defined physics fail ure property changed external agent return its original value cause change removed For high-lift hysteresis Princeton papers visualize An airfoil increasing its angle attack AQA point right before stall Mark point mind Now increase AQA just bit get stall Now recover As de crease AOA airfoil must drop below mark minds eye before has recovered again flying high-lift hysteresis leading edge stall bubble breaks right leading edge For moderate-lift hysteresis visualize An airfoil increasing its AQA first did Before reaches stall point seems slow down drag increases would swear someone deployed spoilers al though continue pull Up trim starts look promising AOA increases slightly flying again little Up trim its stall time Just first example old bubble formed time reattached toward trail ing edgea long bubble cause highdrag condition increased AOA trailing edge bubble started forward again drag decreased Now since little good bit must better Wrong Back high-lift hysteresis leading edge stall would anyone fly plane like have flown Gliders use E-205 airfoila Sagitta exam ple Did anyone say Hey buddy got fly plane fastget step someone thought Maybe put turbulator strip dont have scream around sky Hes right turbulator strip explained next paragraph RMcM course idea Eppler airfoils keep laminar longer cut down drag Well best-laid plans etc e Turbulators trip up laminar flow start sand rolling over surface wing raises drag bit keeps boundary layer surface longer keeps dreaded bubble forming soon full-size aircraft flow seldom lami nar Reynolds numbers high panel line rivet will start turbulent flow RC Gliders Rns below million air appears viscous therefore remains lam inar over larger imperfections turbulate wing apiece trim tape 0010 thick / wide will usually trick OK havent bored tears think about Its going take think up some high-tech stuff just listened CO Top Gun Squadron Miramar try explain G forces TV program Wings dont feel bad Just scream holler cant take promise stop Dont stop Chuck often takes different slant technical explanations before light bulb goes know enjoyed reading Continued page 161 July 1990 157 Full participation EAAs famous OSHKOSH Fly-In Convention many benefits Get full story. ter bubble has formed low Rns like ramps designed cover upper surface airfoil dont look chances wont find RC Soaring/Blakeslee Continued page 157 Chuck Griswalds visualizations hope helped some readers understand what Hot Shoes arc talking about Masters Soaring contest very presti gious because limited fliers having outstanding qualifications Only LSF Level IVs Vs Nats winners eligible Mas ters cosponsored National Soaring Soci ety NSS President Pete Carr kindly sent report March 1990 Masters Soaring contest hosted Silent Wings Soaring Associa tion SWSA West Covina CA directed Pete Olsen site school mid dle town surrounded homes hospital factories Launch equipment Rahm winches retrievers very snappy worked flawlessly during 14 rounds Pete last years Masters CD Myles Mo ran came up mix flight times land ing tasks really tested pilots first landing task runway four feet wide 20 feet long divided five squares point values 20 30 40 30 20 other landing used standard 25-foot tape 100-point max cases runway land ing eliminated loud landings mentioned 89 report Winds calm time light easy-to-find lift Notable among entrants Brian Ag new age 24 Florida flying Ed Bertons new 35-meter Phoenix kits ATRCS-modified Airtronics Module radio early rounds Don Edberg fought lead few points apart Joe Wurts close behind flying Falcon 880 Three pilots flew hot new Mark Allen Falcon con test including eventual winner Bob McGowan northern California nine Air tronics Vision radios use several ATRCS-modified 7SPs making Airtronics RF link choice Masters three Geminis two Paragons flown both ing Ed Slobod designs two crashes during contest Rich Garners Larry Jolly Model Products Chee tah broke elevator pushrod zoom destroyed wing uses balsa ribs full balsa sheeting displayed amazing strength spite terrible flutter set up stab other crash saw Brian Agnews Phoenix tuck inverted dive altitude 100 ft circling landing pattern last round appeared airborne battery failed since little warning trouble Brian Phoenix made impressive show ing finished ninth place spite zero last landing top 10 1 Bob McGowan 1000 Pt Falcon 880 2 Terry Koplan 997 Pt Vi king 3 Joe Wurts 996 pt Falcon 880 4 Chris George 994 pt Hyperlaun 5 Don Edberg 991 pt Quattro 6 Craig Foxgord 86 Pt original design 7 Larry Jolly 986 pt poly Two-Meter 8 Fred Weaver 983 pt Falcon 880 9 Brian Agnew 982 Pt Phoenix 10 Keith Kindrick 978 pt original design 1991 Masters may Florida Brian Agnew going check possible sites subject landing tasks continues expand suggestion half-circle used 100point spot would usual place up wind half would zero points may both half-circle runway will used next year SWSA club CD Pete Olsen de serve hearty Well done putting truly Masterful event Attention F3J enthusiasts case dont rec ognize term F3J new provisional FAI class Thermal Duration Gliding short notice first FAI-sanctioned F3J contest will BARCS-sponsored Interglide 1990 held Warwick England July 21-22 1990 have forgotten exact procedure must something like five contests least three countries competing before F3J will recognized world championship event FAI F3H class Cross-Country Glider flying has struggling requirement years may never get recognized opinion need F3J class addi tion F3B Multi-Task flying huge num ber pilots specialize Thermal flying can have opportunity get together recog nized FAI world championships event plan central England third week July please contact Sam Hitchman 7 Veiny Close Lighthorn Nr Warwick CV35 OAZ Eng land tel 0926-651511 will need nonBritish pilots make FAt-recognized Inter national event Wouldnt surprised might supply Glider tower get nonBritish entry tower thats pronounced tow-er reference pertains fact F3J rules specify hand towing 150-meter line Hand towing common method launching Britain unknown US Id appreciate someone experience hand towing would write order let us know its ins outs responding advertisers mention read about Model Aviation THE LEADER IN COMPETITION - SERIES 100 DIAPRICE 16 NEW 4 0 Ii NEW HIGH TECH AIRFOIL SECTION 10T020%INCREASE IN THRUST MFG OF SELECT HARD MAPLE WOOD WILL NOT FATIGUE LIKE SYNTHETICS FUEL PROOF HIGH LUSTER FINISH DIA PITCHPRICE 5/a34 634 72a33456 833456a 84S66/e7 94566/i77 1045667 106W8W 10SEW 114677/,778 115W 116EW 1l/u67 124W0 12SW0 1256 1356 1456 1556 164N 16678 RC PYLON RACING SERIES 500 DIA PITCHPRICE 75N 5/uH0 516776 SERIES 400C 86/o6t4777 977/t7 W WIDE BLADE EW EXTRA WIDE N NARROW July 1990 161 PROPELLERS CYCLE TAILORED HELICAL PITCH DEVELOPED TO GIVE MAXIMUM THRUST AT 4 CYCLE ENGINE RPM ALL THE LATEST TECHNIQUES USED ON OUR PRO SERIES 3 SEE BELOW PITCH THP 66/o778 677/e 8 677 8 67 678 PRO SERIES 3 LOW WING SHARKLT$9295 SHOULDER WING SHARKST5849a 0 65 Quel' SuIou & Hudwu SinPn-Built Jet U Lightest Pilot PILOT BUST has Modern Jet Helmet Face Mask Oxygen ... REALISTIC Weighs Less Hall Ounce. See Deuler No308 1/8 Scale s5O New Yoi State Outidenit No307 1/7 Scale s8% Add 7S ScanT U LJU EJ Ireii U DISIGNID DGVDLOPED IS CHRIS MACHE RICHMOND OUSTON TX 77056 FLY posvinnuas FUEL FROM KINGSWAY
Edition: Model Aviation - 1990/07
Page Numbers: 46, 47, 154, 155, 156, 157, 161
IVE READ Fred Flies Fred talking about Fred Weaver San Jose CA Fred third person achieve LSF Level V completing rigorous test 1976 John Baxter Steve Work got Level Vs 1975 Gliders equipment available days finishing Level V especially tough jobstill matter Fred three-time winner very popular prestigious Visalia Fall Soaring Festival win ning last year trusty Airtronics Cumic can appreciate credentials Fred has built up storehouse Soaring knowl edge uld wonderful burrow could So saw Fred Flies piece editor John Dvorak South Bay Soaring So ciety newsletter Silent Flyer knew fliers would want read Actually what John did transcribe talk Fred gave club meeting talk included much material questionand-answer type Johns report what Fred said figure Out lift some basic easy-to-understand things to plan before launch come off tow plane will either glide less straight rise sink turn way other Launching right lift won derful doesnt happen too often need know what other things occurs plane turns right itself indi cates lift left pushing plane away must steer opposite way plane wants go turning left get thermal Sink bad least indicates unstable air some mass air going up some other air coming down replace later straight normal glide no up/down bumps left/right turns bad news because indicates air probably stable no ther mals being generated thing case cruise planes best glide ratio try cover much ground possible look ing some kind lift What best lift generators Any dark surface such parking lots pavement rooftops done tar ything dark colored Dark surfaces absorb heat sun warm air adjacent sur rounding air mass warms sufficiently breaks free rises rising patch air pulls air immediate area replace Any dark surface next structures surfaces light colored will especially 46 Model Aviation Radio Conoi Soaring Byron Blakeslee 3134 N Winnebago Dr Sedalla Co 90135 Top placers Memphis Area Soaring Societys 1988 Fail Soaring Tournament LR Ron Stanfield Bob Sowder Neal Jacobs Bill Jenkins Dick Renakers Chip Gibbs Photo sent MASS president Bob Sowder looks like flew interesting mix designs Bernie Coleman Charlotte NC very nice quarter-scale LS-4 Rowing kit Aile ron servos built glass wings Rowing planes available through Tony Arnoux Look againl Thats really figurine posed front Bill Wynans beautiful Va-scale ASW 20 Kit available American Sailplane Designs San Diego CA realistic can get effective because difference surface tem peratures rural areas plowed ground next planted light-colored crops produces differences surface temperatures thus creates ther mals middle square mile asphalt would fewer thermals fringes would thermal activity because temperature difference effect What best search pattern use Tony Arnoux Miami FL 1 35-scale DG 202 Rake Modeile Germany Gor geous Sailplane features all-glass construc tion available through Tonys Imparts Co Tony has new catalog Scale Sailplanes See column information GOLDEN EDmON WE OFFER THE BEST HERES WHY 4 days covered w/good continuity Professional multi camera coverage Vast editing w/complete scenes Excellent narration & music Dynamic indoor showcase static dispiay Over 75 entries w/fuIl model & pilol reports Flighi analysis w/fuII size counterparts Reflections past masters events winners Banquei coverage w/awards & roasting ceremonies ENDORSED BY SCALE MASTERS BOARD SPONSORED BY h3 ER -K & B RUN TIMES APPROX 314 HRS TOTAL RETAIL PART 1 5995 PART 2 5495 SPECtAL ONLY 4795 / 4495 BOTh FOR ONLY 3705 SAVE 2700 XJU syria nt,j rat FOX DONT SETrLE FOR CHEAP SEMIPROFESSIONM COPIES GO WITH THE BEST ALL VIDEOS ON QUALITs MAXELL TAPE W/DELUXE CASES TO ZiNVITATIONAL TOURNAMENT OVER 14 HRS VALUED PRICED REG PR $4995 YOURS FOR ONLY $3995 BUY ANY 3 VIDEOS AT RETAIL PICK 4TH ONE FROM BELOW 11-71 FREE OTHER GREAT VIDEOS 1Airplane Funnies 30 mins3495 2Basic Conat Beginners 107 mins4195 31984 Scale Masters 60 mins3495 41987 Scale Masters 64 mins3995 51988 Scale Masters 90 mica2995 6Warhirds Action SO mins4495 7WhIch Way Up Aerobatirsl 70 mins4495 ORDERING Check MO Visa/Master Card Include phone no orders 350 Shippin 100 per extra No CODs nada res add6 tiotial others aJd 12% tiotal ACADEMY OF AVIATION R & D PO BOX 277 l Crest IL 60429 7083350776 Sales Final PRICES SUBJECT TO CHANGE WITH OUT NOTICE July 1990 47 Asher Charmichaci Mobile AL steadies 5-meter-wingspan 1A-scale SB 10 Rake kit available through Tony Arnoux Scale Nasfrr Continued page 154 1 iv utiucri Send $100 coupon address toADDRESS ar Ave ____________________________ ________ N NJ 07922CITYSTATEZIP L SPECIALISTSINCUSTOMCOX TEE DEE & REED ENGINES 020S 049S 051S 074S & 09S ALLCUSTOM&STOCKPARTS VAILABLE INDIWDUALL V COMPETITIONACCESSORIES RACING WHEELS KLOTZOIL CARBON FIBER SOLID LINES ALL KINDS OFFUEL TUBING THREE BRA NDSOFGLOWPL UGS HA RD-TO-FIND HA RD WARE OLD TIMER SUPPLIES COILS CONDENSERS NGK& STIlT SPARKPLUGS SILK8 COLORS QUA LITYDOPE BRUSHES 5& 7LOOP 1/4RUBBER BANDS TRANSISTORIGNITIONSYSTEMS RESISTOR HIGH TENSIONLEADS 1/2A TEXACO PLA YBOYSR KIT 1/2A TEXACO ENGINES & PARTS KSB & IGNITION TIMERS RUBBERPOWERKITS PROPS TISSUEAND OTHER SUPPLIES C VA NOA CR YLA TES & EPOXIES ORDER BY MAIL OR PHONE 619 7284365 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING HANDLING AND INSURANCE FEE $300 STOCK ORDERS SHIPPED WITHIN 24 HRS RC Scale/Aune Continued page 151 Equal C read 327 Therefore make 327-in circle piece aluminum cut pop can compass cut out scissors rough up underside 80-grit sandpaper glue fuselage us ing RC-56 glue Note will need measure calculate location panel well us ing same method have found great value Scale modeling has come result building flying per severing giving Rewards always lag behind effort life Happy building RC Soaring/Blakeslee Continued page 47 come off tow best cheat some already something scooting over best pattern pays know whats going air before launch Failing having other information lo cal hot spots observing birds bugs etc fly straight upwind watch see plane drifts right left drifting side whats happening plane being sucked some sink will likely thermal other side wing tip suddenly moves up edge thermal trick turn back toward thermal try find core go straight out cant find anything plane getting small hard see dont just turn around come straight back cause youll flying through same air just searched Go off side other circle back wind will help bring plane back What signs fly right middle thermal What youll see plane speeding up tail rising control re sponse improving Whenever see tail airplane go up know its lift Thats can give little rudder aileron pull back stick go Youre make tail Glider sensi tive lift center-of-gravity balance point should far rearward can fly ie Glider being prone stalling too squirrelly fly What happens sink plane becomes sluggish tail may drop slightly Never fly plane tail down Push nose down zip through body sink Something making air go down air somewhere around going up fly another hundred feet should lift Never circle sink never hold Up eleva tor sink its like putting brakes Up el evator does make Glider go uponly up air makes go up rule Speed up sink slow down lift Sink bad because dicates must thermal nearby have quickly fly through patch sink other side up air core thermal have use Glider identify boundaries ther mal paint mental picture what looks like After plane detects thermal dont im mediately start circling Fly straight think thermal until plane stops go ing up identifies other side ther mal Make turn back thermal upwind direction headed upwind sink encountered youve identified another bounda ry thermal So move turn downwind slightly get back thermal lower plane faster has done Low thermals small dont have much altitude play wind blowing 5 mph thermal also drifting speed higher get faster thermal will drift Winds higher altitudes usually stronger ground level As gain alti tude thermal becomes larger can open up turn make bigger circles Al ways drift toward side circle producing strongest lift should stay cored What plane high ther mal want find another thermal because getting too far downwind away field Dont head straight back upwind Thats sink feeding ther mal youre Instead head back upwind an gle left right wind direction What about launching sink ready launch wind picks up Thermal lift headed downwind know youll launching right sink 1 Quickly launch chase thermal downwind 2 Stand winch try zoom off angle next thermal 3 Come up servo problem Sandbagging option 3 unsportsmanlike decision have make hurry based fast thermal moving what kind plane youre flying Gentle Lady 154 Model Aviation SUNBIRD SENSATION WITH STYLE Sunbird combines eye opening performance truly distinctive styling terrific flying design Whether choose 40 size Sunbird 10 Sunbird Jr youll find Sunbird perfect sport plane %fl PRECISION PRODUCTS INC 714 592-5144 510 E Arrow Highway San Dimas CA 91773 JUN lIt V-UIIVVtIVI LJIf V VERA GES OVER 9000 PROPS I! IMMEDIA TESHIPMENTON WSA/MC summer 1940 Jim Walker introduced A-J Fireball U-Control world Countless thousands got first taste model aviation excitement building flying famous airplane commemorate 50th Anniversary birth A-J Fireball proudly announce special limited-edition kit Jim Walkers 1940 original kit contains U fully carved Balsa fusealage Balsa wing tail parts cut shape U hardware hardwood motor mount U decals U complete instructions illustrations U brief history A-J Fireball Offered limited edition 50th Anniversary A-J Fireball numbered dated signed just like kits first produced 1940 can make 60 kits available per month order yours TODAY YES Enclosed check money order $17950 YES cant decide Please send information A-J Manutacturing Inc PO Box68132 Portland OR 97268 503 653-2038 CAN ib 40 fj M* % going zoom So its best have understand ing options prior stepping up winch dont want waste time deciding what greatest thing world being ready launch having gentle breeze come up behind Its wrong direction means downwind launchbut will directly thermal What has happened breeze feel air feeding thermal just front Rule sudden shift direction breeze indicates local thermal present breeze blowing toward thermal What wave action Sometimes windy days youll find fixed ridge wave lift Making S-turns back forth along wave will sustain flight lift plane higher altitudes lift acts like slope lift created wind bounces off side hill may hang out 20 minutes sud den disappear Wave lift may caused sur face features upwind difference temperature layers pressure tree line get good spot landings things guarantees spot landings making same approach single time first thing figure out land plane spot means practicing downwind ap proach turn wind final glide straight spot As wind picks up can shorten downwind leg turn soon er Onto final approach spot sky start downwind leg can thought Initial Point IP Another trick stick plane thats easy fly Polyhedral ships like Oly II Para gon Gemini easy fly Stick same plane keep flying Dont switch air planes Practice landing approach al ways make same approach Youll landing either too short too long learn make proper compensations watch can come land spot time after time after time What about timed landings next step af ter learning make spot landings learn land against watch easiest way have buddy time landing approach IP Once know distance terms time have position normal airspeed time dont need watch So timer will quiet can make normal approach concentrate making 100-point spot landing within couple seconds target time newer airplanes have higher wing loadings have flaps crow Editors note Crow refers Gliders configuration flaps fully extended Down ai lerons fidly extended Up RMcM timed approach can fun because can adjust conditions cheat watch Come high approach fair amount time left watch wont gam bling poor landing because low altitude encountering sink Govern time speed flaps crow elevator youll get time Cross-Country better start high search thermals course Some pilots will fly high can before entering course Others will enter course much sooner search lift along way Continued old timer perfectly proportioned modeling Curtiss Robin 049 EngInes -Channel R/C 41 Wingspan Electric Power Optional $2255 0 Very few full scale ajcraff Ideally soiled model flishf Cs l5 fhe appealing old Curfiss Robin born spruce linen age beautifully proportioned rubber elecfric glow engines Easy end fun build trainerlike performance Flyline Models Cafalog hOt Phono 17031 2739593 INE MODELS INC PO Boa 2136 Faintac VIrginia 22031 USA July 1990 155 w 18 I . 0 G - 4WWaL&ez II b luni your pnaler isIs airfoil plstler FOILED AGAIN! C PLOT AIRFOILS IN ANY CHORD UP TO 24 INCHES MODIFY THICKNESS CAMBER & TRAILING EDGE PLOT SKIN THICKNESS FOR SHEETED WINGS ENTER DATA EASILY 'IA INTELUGENr EDITOR UsER-FRIENDLY MENU-DRIVEN OPERATION INCLUDES Il-PAGE ILLUSTRATED USER MANUAL $4500 naraauaai COok afl ussno~4 asquIas I5MPClflAT uaoo551n.O comma anO Ca mama p0,w Olas oamourC 000r yp Caatas iowan SOS a5 daha Sins atom aaao 00 CYGNET Software714 496-6961 24843 Del Prado #t4lB Dana Point CA 92629 FOAMAIRE 74 IN WING SPAN 6-7 LBS 45-60 POWER 4 OH PLY FOAM AND BALSA WOOD KIT $6995 SEND $100 FOR CATALOGcART 1 NEODESHA KS 66757 OF SAC KITS AND ACC316 325-2821 FREE SHIPPING ON KIT ORDERSISAASTERCARD part country its easy at-newsletter think youll enjoy way ex- density viscosity air unchange tam high altitude hut around Taft CA high al-plains some technical stuffable design purposes titude can achieved quickly Around think wasting time get real high Ofttimes sit listen Hot Shoes talk Rn 6360 x Velocity ft/sec just go Just get up decently high thenabout what should shorten bubble x Length chord ft get goinglengthen transition Guess what Theyre talkSet course wind toward youring about model Gliders Now dont take reference 88 ft/sec ph 44 destination Youll need plane can trim andSo got out Martin Simons book Model Air-30 22 o Glider 10-in-chord just let fly like Paragon big Sagitta Youcraft Aerodynamics published Argus Bookswing flying 30 mph produces Rn cant have plane have fly timeBB Ed Old gave helping233000 will give Reynolds number have able adjust trims let itwhile president new Soartech #8compatible polars find tech manuals go have have ship will thermalthat Herk Stokely sent Princeton pa- Visualize Sand surface wing really easily decide itper Three Amigos sent back 1985air molecules Count grains wing information floating around Iover period time grains er Thanks go Fred Weaver John Dvorakshould able pop bubbles best ofcloser come flying like real airplane letting us pass along great tips Pleasethemless scale effect can count let know would like see Reading through stuff once prettygrains wing increasing speed instructional-type materialdry Oh occasion discussion would livenchord Comprendo up little plane would stall could new catalog Scale ldts available fromsee spinning out sky minds eye 0 Boundary layer area between airTony Amoux Miami Tonys catalog includesThe excitement would build direct proportionfoil surface point above below wing about dozen mostly quarter-scale-size Sail-to Reynolds number overall after asurface air has affected planes German makers Roke Rowingcouple hours Id lose interest chap-passage wing Wik Gliders fly beautifully areters would spaced over few months say top quality Alto included catalog anothing books best way study nar boundary layer visualize page two goodies appeal Scale enthus-and retain informationMany sheets thin paper stacked layer upon iasts Send $4 check refundable order think its time put informa-layer above wing layer moving Imparts Inc. 1736 NW 82 Ave Miami FLtion very consolidated form something likeslower relation wing above 33126Go rebuild later necessary thinkit until closest layer surface moving Competitors F3B should note Tonysit best start Out list definitions withat same speed wing Same hotreal business importing German auto partsthe terms defined rational ordertom surface low-drag condition good source legal Bosch winch ear progresses might stick somepreferable turbulent layerexcept motorsat much lower list prices Write formore high-tech stuff iffin yall dont laughfact laminar flow separates sooner reat detailsat way think about stuff like thistaches much later positive laminar flow low drag What heck guy talking about olds numberhigher efficiency following article Chuck Griswald appeared negative ease will de Thousand Oaks Soaring Society newslet- Air Density/Viscosity x Velocitytach surface difficulty getting ter TOSS-Up Chuck editor fine ngthit reattach PreBuilt MV-i Typhoon * Designed Ron Chidgey * 100% Gator R/O Products Components wing/stab tubes & adjusters canopy & cowl HIGH QUALITY *100% built up construction precision ~g5 ULTRA SWITCH HARNESS * Bob Violetts Magnalite GB 125 used Gold contacts inside switch formersAJI connectoss manufactured * Satisfaction GuaranteedbyFutaba Positive lock Mounting simply requires dnll Thousand sq inWOODORAINS INCing 114 inch hole 100% tested Model Now Available 9 BOX 122Custom cable lengths availble Cumming GA 30130upon request minimal cost 404-889-4758ULTRA SWITCH HARNESS $1995 Tim Megan Richardson PLUS $250 PLUS $600SHIPPING & HANDLING SHIPPING & HANDLINGGa Residents Add 6% Sales Tax 156 Model Aviation E 10 SPAN 30-33 LBS 50-75CC POWER 5-10 LB PAYLOAD OPTIONAL SPREADER KIT $26995 SPDKiT$1995 TRAINER 10 SPAN 19-22 LBS 35-42CC POWER CHOOSE 3 OR 4 OH SLOW AND STABLE 3 CH $14995 4 CH $16495 rOISCOVER HOW GOOD FLYING REALLY CAN BE EAA flying its very best Whether youre pilot builder simply enjoy airplanes EAA Once youve joined become integral part aviations dynamic group EAA can organizationis recognized internationally newsmaker aviation today. pushing cutting edge sport aviation technology new exciting limits adventure can experience others share passion flying JOIN EAA JOIN TODAY $35 ANNUALLY call EAAs TOLL FREE MEMBERSHIP HOTLINE d 4O Major credit cards accepted Something Everyone 0 SPORT AVIATION authoritative monthly magazine . recognized worlds finest aviation publications 0 Three special Divisions interested specific aircraft Antique/Classic AC Aerobatic Warbirds 0 EXPERIMENTER hly publication homebuilding light plane ultralight enthusiasts 0 An extensive chapter network active 700 local areas 0 EAA Technical counselors advise construction projects 0 EAA Family Memberships 0 Specialized aviation insurance coverege 0 EAA Mastercard Gold MasterCard programs S e Bubbles boundary layer becomes de tached usually lower-pressure regions know thickest part wingthe part lift produced Visualize lift pulling sheets paper off surface high point reattaching near trailing edge stagnant area called bubble creases drag dramatically Its just like gluing hunk balsa top wing air mol ecules dont move off wing area As angle attack continues increase after bubble has formed bubble breaks bound ary layer cannot reattach stall occurs e Attached boundary layer stays surface parallel e Detached boundary layer becomes sep arated surface wing bound ary layer may become detached point reattach itself forming bubble may never reattach causing very high drag pos sibly stall s turbulent boundary layer visualize Very fine sand tumbling grain over grain along length airfoil Its rolling motion always thicker laminar flow positive turbulent flow sticks surface longer harder detach com pletely surface negative higher drag laminar flow sition zone area bound ary layer goes laminar turbulentor flow detaches completely Ramps designed airfoils help boundary layer stay attached help reattach af o Hysteresis defined physics fail ure property changed external agent return its original value cause change removed For high-lift hysteresis Princeton papers visualize An airfoil increasing its angle attack AQA point right before stall Mark point mind Now increase AQA just bit get stall Now recover As de crease AOA airfoil must drop below mark minds eye before has recovered again flying high-lift hysteresis leading edge stall bubble breaks right leading edge For moderate-lift hysteresis visualize An airfoil increasing its AQA first did Before reaches stall point seems slow down drag increases would swear someone deployed spoilers al though continue pull Up trim starts look promising AOA increases slightly flying again little Up trim its stall time Just first example old bubble formed time reattached toward trail ing edgea long bubble cause highdrag condition increased AOA trailing edge bubble started forward again drag decreased Now since little good bit must better Wrong Back high-lift hysteresis leading edge stall would anyone fly plane like have flown Gliders use E-205 airfoila Sagitta exam ple Did anyone say Hey buddy got fly plane fastget step someone thought Maybe put turbulator strip dont have scream around sky Hes right turbulator strip explained next paragraph RMcM course idea Eppler airfoils keep laminar longer cut down drag Well best-laid plans etc e Turbulators trip up laminar flow start sand rolling over surface wing raises drag bit keeps boundary layer surface longer keeps dreaded bubble forming soon full-size aircraft flow seldom lami nar Reynolds numbers high panel line rivet will start turbulent flow RC Gliders Rns below million air appears viscous therefore remains lam inar over larger imperfections turbulate wing apiece trim tape 0010 thick / wide will usually trick OK havent bored tears think about Its going take think up some high-tech stuff just listened CO Top Gun Squadron Miramar try explain G forces TV program Wings dont feel bad Just scream holler cant take promise stop Dont stop Chuck often takes different slant technical explanations before light bulb goes know enjoyed reading Continued page 161 July 1990 157 Full participation EAAs famous OSHKOSH Fly-In Convention many benefits Get full story. ter bubble has formed low Rns like ramps designed cover upper surface airfoil dont look chances wont find RC Soaring/Blakeslee Continued page 157 Chuck Griswalds visualizations hope helped some readers understand what Hot Shoes arc talking about Masters Soaring contest very presti gious because limited fliers having outstanding qualifications Only LSF Level IVs Vs Nats winners eligible Mas ters cosponsored National Soaring Soci ety NSS President Pete Carr kindly sent report March 1990 Masters Soaring contest hosted Silent Wings Soaring Associa tion SWSA West Covina CA directed Pete Olsen site school mid dle town surrounded homes hospital factories Launch equipment Rahm winches retrievers very snappy worked flawlessly during 14 rounds Pete last years Masters CD Myles Mo ran came up mix flight times land ing tasks really tested pilots first landing task runway four feet wide 20 feet long divided five squares point values 20 30 40 30 20 other landing used standard 25-foot tape 100-point max cases runway land ing eliminated loud landings mentioned 89 report Winds calm time light easy-to-find lift Notable among entrants Brian Ag new age 24 Florida flying Ed Bertons new 35-meter Phoenix kits ATRCS-modified Airtronics Module radio early rounds Don Edberg fought lead few points apart Joe Wurts close behind flying Falcon 880 Three pilots flew hot new Mark Allen Falcon con test including eventual winner Bob McGowan northern California nine Air tronics Vision radios use several ATRCS-modified 7SPs making Airtronics RF link choice Masters three Geminis two Paragons flown both ing Ed Slobod designs two crashes during contest Rich Garners Larry Jolly Model Products Chee tah broke elevator pushrod zoom destroyed wing uses balsa ribs full balsa sheeting displayed amazing strength spite terrible flutter set up stab other crash saw Brian Agnews Phoenix tuck inverted dive altitude 100 ft circling landing pattern last round appeared airborne battery failed since little warning trouble Brian Phoenix made impressive show ing finished ninth place spite zero last landing top 10 1 Bob McGowan 1000 Pt Falcon 880 2 Terry Koplan 997 Pt Vi king 3 Joe Wurts 996 pt Falcon 880 4 Chris George 994 pt Hyperlaun 5 Don Edberg 991 pt Quattro 6 Craig Foxgord 86 Pt original design 7 Larry Jolly 986 pt poly Two-Meter 8 Fred Weaver 983 pt Falcon 880 9 Brian Agnew 982 Pt Phoenix 10 Keith Kindrick 978 pt original design 1991 Masters may Florida Brian Agnew going check possible sites subject landing tasks continues expand suggestion half-circle used 100point spot would usual place up wind half would zero points may both half-circle runway will used next year SWSA club CD Pete Olsen de serve hearty Well done putting truly Masterful event Attention F3J enthusiasts case dont rec ognize term F3J new provisional FAI class Thermal Duration Gliding short notice first FAI-sanctioned F3J contest will BARCS-sponsored Interglide 1990 held Warwick England July 21-22 1990 have forgotten exact procedure must something like five contests least three countries competing before F3J will recognized world championship event FAI F3H class Cross-Country Glider flying has struggling requirement years may never get recognized opinion need F3J class addi tion F3B Multi-Task flying huge num ber pilots specialize Thermal flying can have opportunity get together recog nized FAI world championships event plan central England third week July please contact Sam Hitchman 7 Veiny Close Lighthorn Nr Warwick CV35 OAZ Eng land tel 0926-651511 will need nonBritish pilots make FAt-recognized Inter national event Wouldnt surprised might supply Glider tower get nonBritish entry tower thats pronounced tow-er reference pertains fact F3J rules specify hand towing 150-meter line Hand towing common method launching Britain unknown US Id appreciate someone experience hand towing would write order let us know its ins outs responding advertisers mention read about Model Aviation THE LEADER IN COMPETITION - SERIES 100 DIAPRICE 16 NEW 4 0 Ii NEW HIGH TECH AIRFOIL SECTION 10T020%INCREASE IN THRUST MFG OF SELECT HARD MAPLE WOOD WILL NOT FATIGUE LIKE SYNTHETICS FUEL PROOF HIGH LUSTER FINISH DIA PITCHPRICE 5/a34 634 72a33456 833456a 84S66/e7 94566/i77 1045667 106W8W 10SEW 114677/,778 115W 116EW 1l/u67 124W0 12SW0 1256 1356 1456 1556 164N 16678 RC PYLON RACING SERIES 500 DIA PITCHPRICE 75N 5/uH0 516776 SERIES 400C 86/o6t4777 977/t7 W WIDE BLADE EW EXTRA WIDE N NARROW July 1990 161 PROPELLERS CYCLE TAILORED HELICAL PITCH DEVELOPED TO GIVE MAXIMUM THRUST AT 4 CYCLE ENGINE RPM ALL THE LATEST TECHNIQUES USED ON OUR PRO SERIES 3 SEE BELOW PITCH THP 66/o778 677/e 8 677 8 67 678 PRO SERIES 3 LOW WING SHARKLT$9295 SHOULDER WING SHARKST5849a 0 65 Quel' SuIou & Hudwu SinPn-Built Jet U Lightest Pilot PILOT BUST has Modern Jet Helmet Face Mask Oxygen ... REALISTIC Weighs Less Hall Ounce. See Deuler No308 1/8 Scale s5O New Yoi State Outidenit No307 1/7 Scale s8% Add 7S ScanT U LJU EJ Ireii U DISIGNID DGVDLOPED IS CHRIS MACHE RICHMOND OUSTON TX 77056 FLY posvinnuas FUEL FROM KINGSWAY
Edition: Model Aviation - 1990/07
Page Numbers: 46, 47, 154, 155, 156, 157, 161
IVE READ Fred Flies Fred talking about Fred Weaver San Jose CA Fred third person achieve LSF Level V completing rigorous test 1976 John Baxter Steve Work got Level Vs 1975 Gliders equipment available days finishing Level V especially tough jobstill matter Fred three-time winner very popular prestigious Visalia Fall Soaring Festival win ning last year trusty Airtronics Cumic can appreciate credentials Fred has built up storehouse Soaring knowl edge uld wonderful burrow could So saw Fred Flies piece editor John Dvorak South Bay Soaring So ciety newsletter Silent Flyer knew fliers would want read Actually what John did transcribe talk Fred gave club meeting talk included much material questionand-answer type Johns report what Fred said figure Out lift some basic easy-to-understand things to plan before launch come off tow plane will either glide less straight rise sink turn way other Launching right lift won derful doesnt happen too often need know what other things occurs plane turns right itself indi cates lift left pushing plane away must steer opposite way plane wants go turning left get thermal Sink bad least indicates unstable air some mass air going up some other air coming down replace later straight normal glide no up/down bumps left/right turns bad news because indicates air probably stable no ther mals being generated thing case cruise planes best glide ratio try cover much ground possible look ing some kind lift What best lift generators Any dark surface such parking lots pavement rooftops done tar ything dark colored Dark surfaces absorb heat sun warm air adjacent sur rounding air mass warms sufficiently breaks free rises rising patch air pulls air immediate area replace Any dark surface next structures surfaces light colored will especially 46 Model Aviation Radio Conoi Soaring Byron Blakeslee 3134 N Winnebago Dr Sedalla Co 90135 Top placers Memphis Area Soaring Societys 1988 Fail Soaring Tournament LR Ron Stanfield Bob Sowder Neal Jacobs Bill Jenkins Dick Renakers Chip Gibbs Photo sent MASS president Bob Sowder looks like flew interesting mix designs Bernie Coleman Charlotte NC very nice quarter-scale LS-4 Rowing kit Aile ron servos built glass wings Rowing planes available through Tony Arnoux Look againl Thats really figurine posed front Bill Wynans beautiful Va-scale ASW 20 Kit available American Sailplane Designs San Diego CA realistic can get effective because difference surface tem peratures rural areas plowed ground next planted light-colored crops produces differences surface temperatures thus creates ther mals middle square mile asphalt would fewer thermals fringes would thermal activity because temperature difference effect What best search pattern use Tony Arnoux Miami FL 1 35-scale DG 202 Rake Modeile Germany Gor geous Sailplane features all-glass construc tion available through Tonys Imparts Co Tony has new catalog Scale Sailplanes See column information GOLDEN EDmON WE OFFER THE BEST HERES WHY 4 days covered w/good continuity Professional multi camera coverage Vast editing w/complete scenes Excellent narration & music Dynamic indoor showcase static dispiay Over 75 entries w/fuIl model & pilol reports Flighi analysis w/fuII size counterparts Reflections past masters events winners Banquei coverage w/awards & roasting ceremonies ENDORSED BY SCALE MASTERS BOARD SPONSORED BY h3 ER -K & B RUN TIMES APPROX 314 HRS TOTAL RETAIL PART 1 5995 PART 2 5495 SPECtAL ONLY 4795 / 4495 BOTh FOR ONLY 3705 SAVE 2700 XJU syria nt,j rat FOX DONT SETrLE FOR CHEAP SEMIPROFESSIONM COPIES GO WITH THE BEST ALL VIDEOS ON QUALITs MAXELL TAPE W/DELUXE CASES TO ZiNVITATIONAL TOURNAMENT OVER 14 HRS VALUED PRICED REG PR $4995 YOURS FOR ONLY $3995 BUY ANY 3 VIDEOS AT RETAIL PICK 4TH ONE FROM BELOW 11-71 FREE OTHER GREAT VIDEOS 1Airplane Funnies 30 mins3495 2Basic Conat Beginners 107 mins4195 31984 Scale Masters 60 mins3495 41987 Scale Masters 64 mins3995 51988 Scale Masters 90 mica2995 6Warhirds Action SO mins4495 7WhIch Way Up Aerobatirsl 70 mins4495 ORDERING Check MO Visa/Master Card Include phone no orders 350 Shippin 100 per extra No CODs nada res add6 tiotial others aJd 12% tiotal ACADEMY OF AVIATION R & D PO BOX 277 l Crest IL 60429 7083350776 Sales Final PRICES SUBJECT TO CHANGE WITH OUT NOTICE July 1990 47 Asher Charmichaci Mobile AL steadies 5-meter-wingspan 1A-scale SB 10 Rake kit available through Tony Arnoux Scale Nasfrr Continued page 154 1 iv utiucri Send $100 coupon address toADDRESS ar Ave ____________________________ ________ N NJ 07922CITYSTATEZIP L SPECIALISTSINCUSTOMCOX TEE DEE & REED ENGINES 020S 049S 051S 074S & 09S ALLCUSTOM&STOCKPARTS VAILABLE INDIWDUALL V COMPETITIONACCESSORIES RACING WHEELS KLOTZOIL CARBON FIBER SOLID LINES ALL KINDS OFFUEL TUBING THREE BRA NDSOFGLOWPL UGS HA RD-TO-FIND HA RD WARE OLD TIMER SUPPLIES COILS CONDENSERS NGK& STIlT SPARKPLUGS SILK8 COLORS QUA LITYDOPE BRUSHES 5& 7LOOP 1/4RUBBER BANDS TRANSISTORIGNITIONSYSTEMS RESISTOR HIGH TENSIONLEADS 1/2A TEXACO PLA YBOYSR KIT 1/2A TEXACO ENGINES & PARTS KSB & IGNITION TIMERS RUBBERPOWERKITS PROPS TISSUEAND OTHER SUPPLIES C VA NOA CR YLA TES & EPOXIES ORDER BY MAIL OR PHONE 619 7284365 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING HANDLING AND INSURANCE FEE $300 STOCK ORDERS SHIPPED WITHIN 24 HRS RC Scale/Aune Continued page 151 Equal C read 327 Therefore make 327-in circle piece aluminum cut pop can compass cut out scissors rough up underside 80-grit sandpaper glue fuselage us ing RC-56 glue Note will need measure calculate location panel well us ing same method have found great value Scale modeling has come result building flying per severing giving Rewards always lag behind effort life Happy building RC Soaring/Blakeslee Continued page 47 come off tow best cheat some already something scooting over best pattern pays know whats going air before launch Failing having other information lo cal hot spots observing birds bugs etc fly straight upwind watch see plane drifts right left drifting side whats happening plane being sucked some sink will likely thermal other side wing tip suddenly moves up edge thermal trick turn back toward thermal try find core go straight out cant find anything plane getting small hard see dont just turn around come straight back cause youll flying through same air just searched Go off side other circle back wind will help bring plane back What signs fly right middle thermal What youll see plane speeding up tail rising control re sponse improving Whenever see tail airplane go up know its lift Thats can give little rudder aileron pull back stick go Youre make tail Glider sensi tive lift center-of-gravity balance point should far rearward can fly ie Glider being prone stalling too squirrelly fly What happens sink plane becomes sluggish tail may drop slightly Never fly plane tail down Push nose down zip through body sink Something making air go down air somewhere around going up fly another hundred feet should lift Never circle sink never hold Up eleva tor sink its like putting brakes Up el evator does make Glider go uponly up air makes go up rule Speed up sink slow down lift Sink bad because dicates must thermal nearby have quickly fly through patch sink other side up air core thermal have use Glider identify boundaries ther mal paint mental picture what looks like After plane detects thermal dont im mediately start circling Fly straight think thermal until plane stops go ing up identifies other side ther mal Make turn back thermal upwind direction headed upwind sink encountered youve identified another bounda ry thermal So move turn downwind slightly get back thermal lower plane faster has done Low thermals small dont have much altitude play wind blowing 5 mph thermal also drifting speed higher get faster thermal will drift Winds higher altitudes usually stronger ground level As gain alti tude thermal becomes larger can open up turn make bigger circles Al ways drift toward side circle producing strongest lift should stay cored What plane high ther mal want find another thermal because getting too far downwind away field Dont head straight back upwind Thats sink feeding ther mal youre Instead head back upwind an gle left right wind direction What about launching sink ready launch wind picks up Thermal lift headed downwind know youll launching right sink 1 Quickly launch chase thermal downwind 2 Stand winch try zoom off angle next thermal 3 Come up servo problem Sandbagging option 3 unsportsmanlike decision have make hurry based fast thermal moving what kind plane youre flying Gentle Lady 154 Model Aviation SUNBIRD SENSATION WITH STYLE Sunbird combines eye opening performance truly distinctive styling terrific flying design Whether choose 40 size Sunbird 10 Sunbird Jr youll find Sunbird perfect sport plane %fl PRECISION PRODUCTS INC 714 592-5144 510 E Arrow Highway San Dimas CA 91773 JUN lIt V-UIIVVtIVI LJIf V VERA GES OVER 9000 PROPS I! IMMEDIA TESHIPMENTON WSA/MC summer 1940 Jim Walker introduced A-J Fireball U-Control world Countless thousands got first taste model aviation excitement building flying famous airplane commemorate 50th Anniversary birth A-J Fireball proudly announce special limited-edition kit Jim Walkers 1940 original kit contains U fully carved Balsa fusealage Balsa wing tail parts cut shape U hardware hardwood motor mount U decals U complete instructions illustrations U brief history A-J Fireball Offered limited edition 50th Anniversary A-J Fireball numbered dated signed just like kits first produced 1940 can make 60 kits available per month order yours TODAY YES Enclosed check money order $17950 YES cant decide Please send information A-J Manutacturing Inc PO Box68132 Portland OR 97268 503 653-2038 CAN ib 40 fj M* % going zoom So its best have understand ing options prior stepping up winch dont want waste time deciding what greatest thing world being ready launch having gentle breeze come up behind Its wrong direction means downwind launchbut will directly thermal What has happened breeze feel air feeding thermal just front Rule sudden shift direction breeze indicates local thermal present breeze blowing toward thermal What wave action Sometimes windy days youll find fixed ridge wave lift Making S-turns back forth along wave will sustain flight lift plane higher altitudes lift acts like slope lift created wind bounces off side hill may hang out 20 minutes sud den disappear Wave lift may caused sur face features upwind difference temperature layers pressure tree line get good spot landings things guarantees spot landings making same approach single time first thing figure out land plane spot means practicing downwind ap proach turn wind final glide straight spot As wind picks up can shorten downwind leg turn soon er Onto final approach spot sky start downwind leg can thought Initial Point IP Another trick stick plane thats easy fly Polyhedral ships like Oly II Para gon Gemini easy fly Stick same plane keep flying Dont switch air planes Practice landing approach al ways make same approach Youll landing either too short too long learn make proper compensations watch can come land spot time after time after time What about timed landings next step af ter learning make spot landings learn land against watch easiest way have buddy time landing approach IP Once know distance terms time have position normal airspeed time dont need watch So timer will quiet can make normal approach concentrate making 100-point spot landing within couple seconds target time newer airplanes have higher wing loadings have flaps crow Editors note Crow refers Gliders configuration flaps fully extended Down ai lerons fidly extended Up RMcM timed approach can fun because can adjust conditions cheat watch Come high approach fair amount time left watch wont gam bling poor landing because low altitude encountering sink Govern time speed flaps crow elevator youll get time Cross-Country better start high search thermals course Some pilots will fly high can before entering course Others will enter course much sooner search lift along way Continued old timer perfectly proportioned modeling Curtiss Robin 049 EngInes -Channel R/C 41 Wingspan Electric Power Optional $2255 0 Very few full scale ajcraff Ideally soiled model flishf Cs l5 fhe appealing old Curfiss Robin born spruce linen age beautifully proportioned rubber elecfric glow engines Easy end fun build trainerlike performance Flyline Models Cafalog hOt Phono 17031 2739593 INE MODELS INC PO Boa 2136 Faintac VIrginia 22031 USA July 1990 155 w 18 I . 0 G - 4WWaL&ez II b luni your pnaler isIs airfoil plstler FOILED AGAIN! C PLOT AIRFOILS IN ANY CHORD UP TO 24 INCHES MODIFY THICKNESS CAMBER & TRAILING EDGE PLOT SKIN THICKNESS FOR SHEETED WINGS ENTER DATA EASILY 'IA INTELUGENr EDITOR UsER-FRIENDLY MENU-DRIVEN OPERATION INCLUDES Il-PAGE ILLUSTRATED USER MANUAL $4500 naraauaai COok afl ussno~4 asquIas I5MPClflAT uaoo551n.O comma anO Ca mama p0,w Olas oamourC 000r yp Caatas iowan SOS a5 daha Sins atom aaao 00 CYGNET Software714 496-6961 24843 Del Prado #t4lB Dana Point CA 92629 FOAMAIRE 74 IN WING SPAN 6-7 LBS 45-60 POWER 4 OH PLY FOAM AND BALSA WOOD KIT $6995 SEND $100 FOR CATALOGcART 1 NEODESHA KS 66757 OF SAC KITS AND ACC316 325-2821 FREE SHIPPING ON KIT ORDERSISAASTERCARD part country its easy at-newsletter think youll enjoy way ex- density viscosity air unchange tam high altitude hut around Taft CA high al-plains some technical stuffable design purposes titude can achieved quickly Around think wasting time get real high Ofttimes sit listen Hot Shoes talk Rn 6360 x Velocity ft/sec just go Just get up decently high thenabout what should shorten bubble x Length chord ft get goinglengthen transition Guess what Theyre talkSet course wind toward youring about model Gliders Now dont take reference 88 ft/sec ph 44 destination Youll need plane can trim andSo got out Martin Simons book Model Air-30 22 o Glider 10-in-chord just let fly like Paragon big Sagitta Youcraft Aerodynamics published Argus Bookswing flying 30 mph produces Rn cant have plane have fly timeBB Ed Old gave helping233000 will give Reynolds number have able adjust trims let itwhile president new Soartech #8compatible polars find tech manuals go have have ship will thermalthat Herk Stokely sent Princeton pa- Visualize Sand surface wing really easily decide itper Three Amigos sent back 1985air molecules Count grains wing information floating around Iover period time grains er Thanks go Fred Weaver John Dvorakshould able pop bubbles best ofcloser come flying like real airplane letting us pass along great tips Pleasethemless scale effect can count let know would like see Reading through stuff once prettygrains wing increasing speed instructional-type materialdry Oh occasion discussion would livenchord Comprendo up little plane would stall could new catalog Scale ldts available fromsee spinning out sky minds eye 0 Boundary layer area between airTony Amoux Miami Tonys catalog includesThe excitement would build direct proportionfoil surface point above below wing about dozen mostly quarter-scale-size Sail-to Reynolds number overall after asurface air has affected planes German makers Roke Rowingcouple hours Id lose interest chap-passage wing Wik Gliders fly beautifully areters would spaced over few months say top quality Alto included catalog anothing books best way study nar boundary layer visualize page two goodies appeal Scale enthus-and retain informationMany sheets thin paper stacked layer upon iasts Send $4 check refundable order think its time put informa-layer above wing layer moving Imparts Inc. 1736 NW 82 Ave Miami FLtion very consolidated form something likeslower relation wing above 33126Go rebuild later necessary thinkit until closest layer surface moving Competitors F3B should note Tonysit best start Out list definitions withat same speed wing Same hotreal business importing German auto partsthe terms defined rational ordertom surface low-drag condition good source legal Bosch winch ear progresses might stick somepreferable turbulent layerexcept motorsat much lower list prices Write formore high-tech stuff iffin yall dont laughfact laminar flow separates sooner reat detailsat way think about stuff like thistaches much later positive laminar flow low drag What heck guy talking about olds numberhigher efficiency following article Chuck Griswald appeared negative ease will de Thousand Oaks Soaring Society newslet- Air Density/Viscosity x Velocitytach surface difficulty getting ter TOSS-Up Chuck editor fine ngthit reattach PreBuilt MV-i Typhoon * Designed Ron Chidgey * 100% Gator R/O Products Components wing/stab tubes & adjusters canopy & cowl HIGH QUALITY *100% built up construction precision ~g5 ULTRA SWITCH HARNESS * Bob Violetts Magnalite GB 125 used Gold contacts inside switch formersAJI connectoss manufactured * Satisfaction GuaranteedbyFutaba Positive lock Mounting simply requires dnll Thousand sq inWOODORAINS INCing 114 inch hole 100% tested Model Now Available 9 BOX 122Custom cable lengths availble Cumming GA 30130upon request minimal cost 404-889-4758ULTRA SWITCH HARNESS $1995 Tim Megan Richardson PLUS $250 PLUS $600SHIPPING & HANDLING SHIPPING & HANDLINGGa Residents Add 6% Sales Tax 156 Model Aviation E 10 SPAN 30-33 LBS 50-75CC POWER 5-10 LB PAYLOAD OPTIONAL SPREADER KIT $26995 SPDKiT$1995 TRAINER 10 SPAN 19-22 LBS 35-42CC POWER CHOOSE 3 OR 4 OH SLOW AND STABLE 3 CH $14995 4 CH $16495 rOISCOVER HOW GOOD FLYING REALLY CAN BE EAA flying its very best Whether youre pilot builder simply enjoy airplanes EAA Once youve joined become integral part aviations dynamic group EAA can organizationis recognized internationally newsmaker aviation today. pushing cutting edge sport aviation technology new exciting limits adventure can experience others share passion flying JOIN EAA JOIN TODAY $35 ANNUALLY call EAAs TOLL FREE MEMBERSHIP HOTLINE d 4O Major credit cards accepted Something Everyone 0 SPORT AVIATION authoritative monthly magazine . recognized worlds finest aviation publications 0 Three special Divisions interested specific aircraft Antique/Classic AC Aerobatic Warbirds 0 EXPERIMENTER hly publication homebuilding light plane ultralight enthusiasts 0 An extensive chapter network active 700 local areas 0 EAA Technical counselors advise construction projects 0 EAA Family Memberships 0 Specialized aviation insurance coverege 0 EAA Mastercard Gold MasterCard programs S e Bubbles boundary layer becomes de tached usually lower-pressure regions know thickest part wingthe part lift produced Visualize lift pulling sheets paper off surface high point reattaching near trailing edge stagnant area called bubble creases drag dramatically Its just like gluing hunk balsa top wing air mol ecules dont move off wing area As angle attack continues increase after bubble has formed bubble breaks bound ary layer cannot reattach stall occurs e Attached boundary layer stays surface parallel e Detached boundary layer becomes sep arated surface wing bound ary layer may become detached point reattach itself forming bubble may never reattach causing very high drag pos sibly stall s turbulent boundary layer visualize Very fine sand tumbling grain over grain along length airfoil Its rolling motion always thicker laminar flow positive turbulent flow sticks surface longer harder detach com pletely surface negative higher drag laminar flow sition zone area bound ary layer goes laminar turbulentor flow detaches completely Ramps designed airfoils help boundary layer stay attached help reattach af o Hysteresis defined physics fail ure property changed external agent return its original value cause change removed For high-lift hysteresis Princeton papers visualize An airfoil increasing its angle attack AQA point right before stall Mark point mind Now increase AQA just bit get stall Now recover As de crease AOA airfoil must drop below mark minds eye before has recovered again flying high-lift hysteresis leading edge stall bubble breaks right leading edge For moderate-lift hysteresis visualize An airfoil increasing its AQA first did Before reaches stall point seems slow down drag increases would swear someone deployed spoilers al though continue pull Up trim starts look promising AOA increases slightly flying again little Up trim its stall time Just first example old bubble formed time reattached toward trail ing edgea long bubble cause highdrag condition increased AOA trailing edge bubble started forward again drag decreased Now since little good bit must better Wrong Back high-lift hysteresis leading edge stall would anyone fly plane like have flown Gliders use E-205 airfoila Sagitta exam ple Did anyone say Hey buddy got fly plane fastget step someone thought Maybe put turbulator strip dont have scream around sky Hes right turbulator strip explained next paragraph RMcM course idea Eppler airfoils keep laminar longer cut down drag Well best-laid plans etc e Turbulators trip up laminar flow start sand rolling over surface wing raises drag bit keeps boundary layer surface longer keeps dreaded bubble forming soon full-size aircraft flow seldom lami nar Reynolds numbers high panel line rivet will start turbulent flow RC Gliders Rns below million air appears viscous therefore remains lam inar over larger imperfections turbulate wing apiece trim tape 0010 thick / wide will usually trick OK havent bored tears think about Its going take think up some high-tech stuff just listened CO Top Gun Squadron Miramar try explain G forces TV program Wings dont feel bad Just scream holler cant take promise stop Dont stop Chuck often takes different slant technical explanations before light bulb goes know enjoyed reading Continued page 161 July 1990 157 Full participation EAAs famous OSHKOSH Fly-In Convention many benefits Get full story. ter bubble has formed low Rns like ramps designed cover upper surface airfoil dont look chances wont find RC Soaring/Blakeslee Continued page 157 Chuck Griswalds visualizations hope helped some readers understand what Hot Shoes arc talking about Masters Soaring contest very presti gious because limited fliers having outstanding qualifications Only LSF Level IVs Vs Nats winners eligible Mas ters cosponsored National Soaring Soci ety NSS President Pete Carr kindly sent report March 1990 Masters Soaring contest hosted Silent Wings Soaring Associa tion SWSA West Covina CA directed Pete Olsen site school mid dle town surrounded homes hospital factories Launch equipment Rahm winches retrievers very snappy worked flawlessly during 14 rounds Pete last years Masters CD Myles Mo ran came up mix flight times land ing tasks really tested pilots first landing task runway four feet wide 20 feet long divided five squares point values 20 30 40 30 20 other landing used standard 25-foot tape 100-point max cases runway land ing eliminated loud landings mentioned 89 report Winds calm time light easy-to-find lift Notable among entrants Brian Ag new age 24 Florida flying Ed Bertons new 35-meter Phoenix kits ATRCS-modified Airtronics Module radio early rounds Don Edberg fought lead few points apart Joe Wurts close behind flying Falcon 880 Three pilots flew hot new Mark Allen Falcon con test including eventual winner Bob McGowan northern California nine Air tronics Vision radios use several ATRCS-modified 7SPs making Airtronics RF link choice Masters three Geminis two Paragons flown both ing Ed Slobod designs two crashes during contest Rich Garners Larry Jolly Model Products Chee tah broke elevator pushrod zoom destroyed wing uses balsa ribs full balsa sheeting displayed amazing strength spite terrible flutter set up stab other crash saw Brian Agnews Phoenix tuck inverted dive altitude 100 ft circling landing pattern last round appeared airborne battery failed since little warning trouble Brian Phoenix made impressive show ing finished ninth place spite zero last landing top 10 1 Bob McGowan 1000 Pt Falcon 880 2 Terry Koplan 997 Pt Vi king 3 Joe Wurts 996 pt Falcon 880 4 Chris George 994 pt Hyperlaun 5 Don Edberg 991 pt Quattro 6 Craig Foxgord 86 Pt original design 7 Larry Jolly 986 pt poly Two-Meter 8 Fred Weaver 983 pt Falcon 880 9 Brian Agnew 982 Pt Phoenix 10 Keith Kindrick 978 pt original design 1991 Masters may Florida Brian Agnew going check possible sites subject landing tasks continues expand suggestion half-circle used 100point spot would usual place up wind half would zero points may both half-circle runway will used next year SWSA club CD Pete Olsen de serve hearty Well done putting truly Masterful event Attention F3J enthusiasts case dont rec ognize term F3J new provisional FAI class Thermal Duration Gliding short notice first FAI-sanctioned F3J contest will BARCS-sponsored Interglide 1990 held Warwick England July 21-22 1990 have forgotten exact procedure must something like five contests least three countries competing before F3J will recognized world championship event FAI F3H class Cross-Country Glider flying has struggling requirement years may never get recognized opinion need F3J class addi tion F3B Multi-Task flying huge num ber pilots specialize Thermal flying can have opportunity get together recog nized FAI world championships event plan central England third week July please contact Sam Hitchman 7 Veiny Close Lighthorn Nr Warwick CV35 OAZ Eng land tel 0926-651511 will need nonBritish pilots make FAt-recognized Inter national event Wouldnt surprised might supply Glider tower get nonBritish entry tower thats pronounced tow-er reference pertains fact F3J rules specify hand towing 150-meter line Hand towing common method launching Britain unknown US Id appreciate someone experience hand towing would write order let us know its ins outs responding advertisers mention read about Model Aviation THE LEADER IN COMPETITION - SERIES 100 DIAPRICE 16 NEW 4 0 Ii NEW HIGH TECH AIRFOIL SECTION 10T020%INCREASE IN THRUST MFG OF SELECT HARD MAPLE WOOD WILL NOT FATIGUE LIKE SYNTHETICS FUEL PROOF HIGH LUSTER FINISH DIA PITCHPRICE 5/a34 634 72a33456 833456a 84S66/e7 94566/i77 1045667 106W8W 10SEW 114677/,778 115W 116EW 1l/u67 124W0 12SW0 1256 1356 1456 1556 164N 16678 RC PYLON RACING SERIES 500 DIA PITCHPRICE 75N 5/uH0 516776 SERIES 400C 86/o6t4777 977/t7 W WIDE BLADE EW EXTRA WIDE N NARROW July 1990 161 PROPELLERS CYCLE TAILORED HELICAL PITCH DEVELOPED TO GIVE MAXIMUM THRUST AT 4 CYCLE ENGINE RPM ALL THE LATEST TECHNIQUES USED ON OUR PRO SERIES 3 SEE BELOW PITCH THP 66/o778 677/e 8 677 8 67 678 PRO SERIES 3 LOW WING SHARKLT$9295 SHOULDER WING SHARKST5849a 0 65 Quel' SuIou & Hudwu SinPn-Built Jet U Lightest Pilot PILOT BUST has Modern Jet Helmet Face Mask Oxygen ... REALISTIC Weighs Less Hall Ounce. See Deuler No308 1/8 Scale s5O New Yoi State Outidenit No307 1/7 Scale s8% Add 7S ScanT U LJU EJ Ireii U DISIGNID DGVDLOPED IS CHRIS MACHE RICHMOND OUSTON TX 77056 FLY posvinnuas FUEL FROM KINGSWAY
Edition: Model Aviation - 1990/07
Page Numbers: 46, 47, 154, 155, 156, 157, 161
IVE READ Fred Flies Fred talking about Fred Weaver San Jose CA Fred third person achieve LSF Level V completing rigorous test 1976 John Baxter Steve Work got Level Vs 1975 Gliders equipment available days finishing Level V especially tough jobstill matter Fred three-time winner very popular prestigious Visalia Fall Soaring Festival win ning last year trusty Airtronics Cumic can appreciate credentials Fred has built up storehouse Soaring knowl edge uld wonderful burrow could So saw Fred Flies piece editor John Dvorak South Bay Soaring So ciety newsletter Silent Flyer knew fliers would want read Actually what John did transcribe talk Fred gave club meeting talk included much material questionand-answer type Johns report what Fred said figure Out lift some basic easy-to-understand things to plan before launch come off tow plane will either glide less straight rise sink turn way other Launching right lift won derful doesnt happen too often need know what other things occurs plane turns right itself indi cates lift left pushing plane away must steer opposite way plane wants go turning left get thermal Sink bad least indicates unstable air some mass air going up some other air coming down replace later straight normal glide no up/down bumps left/right turns bad news because indicates air probably stable no ther mals being generated thing case cruise planes best glide ratio try cover much ground possible look ing some kind lift What best lift generators Any dark surface such parking lots pavement rooftops done tar ything dark colored Dark surfaces absorb heat sun warm air adjacent sur rounding air mass warms sufficiently breaks free rises rising patch air pulls air immediate area replace Any dark surface next structures surfaces light colored will especially 46 Model Aviation Radio Conoi Soaring Byron Blakeslee 3134 N Winnebago Dr Sedalla Co 90135 Top placers Memphis Area Soaring Societys 1988 Fail Soaring Tournament LR Ron Stanfield Bob Sowder Neal Jacobs Bill Jenkins Dick Renakers Chip Gibbs Photo sent MASS president Bob Sowder looks like flew interesting mix designs Bernie Coleman Charlotte NC very nice quarter-scale LS-4 Rowing kit Aile ron servos built glass wings Rowing planes available through Tony Arnoux Look againl Thats really figurine posed front Bill Wynans beautiful Va-scale ASW 20 Kit available American Sailplane Designs San Diego CA realistic can get effective because difference surface tem peratures rural areas plowed ground next planted light-colored crops produces differences surface temperatures thus creates ther mals middle square mile asphalt would fewer thermals fringes would thermal activity because temperature difference effect What best search pattern use Tony Arnoux Miami FL 1 35-scale DG 202 Rake Modeile Germany Gor geous Sailplane features all-glass construc tion available through Tonys Imparts Co Tony has new catalog Scale Sailplanes See column information GOLDEN EDmON WE OFFER THE BEST HERES WHY 4 days covered w/good continuity Professional multi camera coverage Vast editing w/complete scenes Excellent narration & music Dynamic indoor showcase static dispiay Over 75 entries w/fuIl model & pilol reports Flighi analysis w/fuII size counterparts Reflections past masters events winners Banquei coverage w/awards & roasting ceremonies ENDORSED BY SCALE MASTERS BOARD SPONSORED BY h3 ER -K & B RUN TIMES APPROX 314 HRS TOTAL RETAIL PART 1 5995 PART 2 5495 SPECtAL ONLY 4795 / 4495 BOTh FOR ONLY 3705 SAVE 2700 XJU syria nt,j rat FOX DONT SETrLE FOR CHEAP SEMIPROFESSIONM COPIES GO WITH THE BEST ALL VIDEOS ON QUALITs MAXELL TAPE W/DELUXE CASES TO ZiNVITATIONAL TOURNAMENT OVER 14 HRS VALUED PRICED REG PR $4995 YOURS FOR ONLY $3995 BUY ANY 3 VIDEOS AT RETAIL PICK 4TH ONE FROM BELOW 11-71 FREE OTHER GREAT VIDEOS 1Airplane Funnies 30 mins3495 2Basic Conat Beginners 107 mins4195 31984 Scale Masters 60 mins3495 41987 Scale Masters 64 mins3995 51988 Scale Masters 90 mica2995 6Warhirds Action SO mins4495 7WhIch Way Up Aerobatirsl 70 mins4495 ORDERING Check MO Visa/Master Card Include phone no orders 350 Shippin 100 per extra No CODs nada res add6 tiotial others aJd 12% tiotal ACADEMY OF AVIATION R & D PO BOX 277 l Crest IL 60429 7083350776 Sales Final PRICES SUBJECT TO CHANGE WITH OUT NOTICE July 1990 47 Asher Charmichaci Mobile AL steadies 5-meter-wingspan 1A-scale SB 10 Rake kit available through Tony Arnoux Scale Nasfrr Continued page 154 1 iv utiucri Send $100 coupon address toADDRESS ar Ave ____________________________ ________ N NJ 07922CITYSTATEZIP L SPECIALISTSINCUSTOMCOX TEE DEE & REED ENGINES 020S 049S 051S 074S & 09S ALLCUSTOM&STOCKPARTS VAILABLE INDIWDUALL V COMPETITIONACCESSORIES RACING WHEELS KLOTZOIL CARBON FIBER SOLID LINES ALL KINDS OFFUEL TUBING THREE BRA NDSOFGLOWPL UGS HA RD-TO-FIND HA RD WARE OLD TIMER SUPPLIES COILS CONDENSERS NGK& STIlT SPARKPLUGS SILK8 COLORS QUA LITYDOPE BRUSHES 5& 7LOOP 1/4RUBBER BANDS TRANSISTORIGNITIONSYSTEMS RESISTOR HIGH TENSIONLEADS 1/2A TEXACO PLA YBOYSR KIT 1/2A TEXACO ENGINES & PARTS KSB & IGNITION TIMERS RUBBERPOWERKITS PROPS TISSUEAND OTHER SUPPLIES C VA NOA CR YLA TES & EPOXIES ORDER BY MAIL OR PHONE 619 7284365 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING HANDLING AND INSURANCE FEE $300 STOCK ORDERS SHIPPED WITHIN 24 HRS RC Scale/Aune Continued page 151 Equal C read 327 Therefore make 327-in circle piece aluminum cut pop can compass cut out scissors rough up underside 80-grit sandpaper glue fuselage us ing RC-56 glue Note will need measure calculate location panel well us ing same method have found great value Scale modeling has come result building flying per severing giving Rewards always lag behind effort life Happy building RC Soaring/Blakeslee Continued page 47 come off tow best cheat some already something scooting over best pattern pays know whats going air before launch Failing having other information lo cal hot spots observing birds bugs etc fly straight upwind watch see plane drifts right left drifting side whats happening plane being sucked some sink will likely thermal other side wing tip suddenly moves up edge thermal trick turn back toward thermal try find core go straight out cant find anything plane getting small hard see dont just turn around come straight back cause youll flying through same air just searched Go off side other circle back wind will help bring plane back What signs fly right middle thermal What youll see plane speeding up tail rising control re sponse improving Whenever see tail airplane go up know its lift Thats can give little rudder aileron pull back stick go Youre make tail Glider sensi tive lift center-of-gravity balance point should far rearward can fly ie Glider being prone stalling too squirrelly fly What happens sink plane becomes sluggish tail may drop slightly Never fly plane tail down Push nose down zip through body sink Something making air go down air somewhere around going up fly another hundred feet should lift Never circle sink never hold Up eleva tor sink its like putting brakes Up el evator does make Glider go uponly up air makes go up rule Speed up sink slow down lift Sink bad because dicates must thermal nearby have quickly fly through patch sink other side up air core thermal have use Glider identify boundaries ther mal paint mental picture what looks like After plane detects thermal dont im mediately start circling Fly straight think thermal until plane stops go ing up identifies other side ther mal Make turn back thermal upwind direction headed upwind sink encountered youve identified another bounda ry thermal So move turn downwind slightly get back thermal lower plane faster has done Low thermals small dont have much altitude play wind blowing 5 mph thermal also drifting speed higher get faster thermal will drift Winds higher altitudes usually stronger ground level As gain alti tude thermal becomes larger can open up turn make bigger circles Al ways drift toward side circle producing strongest lift should stay cored What plane high ther mal want find another thermal because getting too far downwind away field Dont head straight back upwind Thats sink feeding ther mal youre Instead head back upwind an gle left right wind direction What about launching sink ready launch wind picks up Thermal lift headed downwind know youll launching right sink 1 Quickly launch chase thermal downwind 2 Stand winch try zoom off angle next thermal 3 Come up servo problem Sandbagging option 3 unsportsmanlike decision have make hurry based fast thermal moving what kind plane youre flying Gentle Lady 154 Model Aviation SUNBIRD SENSATION WITH STYLE Sunbird combines eye opening performance truly distinctive styling terrific flying design Whether choose 40 size Sunbird 10 Sunbird Jr youll find Sunbird perfect sport plane %fl PRECISION PRODUCTS INC 714 592-5144 510 E Arrow Highway San Dimas CA 91773 JUN lIt V-UIIVVtIVI LJIf V VERA GES OVER 9000 PROPS I! IMMEDIA TESHIPMENTON WSA/MC summer 1940 Jim Walker introduced A-J Fireball U-Control world Countless thousands got first taste model aviation excitement building flying famous airplane commemorate 50th Anniversary birth A-J Fireball proudly announce special limited-edition kit Jim Walkers 1940 original kit contains U fully carved Balsa fusealage Balsa wing tail parts cut shape U hardware hardwood motor mount U decals U complete instructions illustrations U brief history A-J Fireball Offered limited edition 50th Anniversary A-J Fireball numbered dated signed just like kits first produced 1940 can make 60 kits available per month order yours TODAY YES Enclosed check money order $17950 YES cant decide Please send information A-J Manutacturing Inc PO Box68132 Portland OR 97268 503 653-2038 CAN ib 40 fj M* % going zoom So its best have understand ing options prior stepping up winch dont want waste time deciding what greatest thing world being ready launch having gentle breeze come up behind Its wrong direction means downwind launchbut will directly thermal What has happened breeze feel air feeding thermal just front Rule sudden shift direction breeze indicates local thermal present breeze blowing toward thermal What wave action Sometimes windy days youll find fixed ridge wave lift Making S-turns back forth along wave will sustain flight lift plane higher altitudes lift acts like slope lift created wind bounces off side hill may hang out 20 minutes sud den disappear Wave lift may caused sur face features upwind difference temperature layers pressure tree line get good spot landings things guarantees spot landings making same approach single time first thing figure out land plane spot means practicing downwind ap proach turn wind final glide straight spot As wind picks up can shorten downwind leg turn soon er Onto final approach spot sky start downwind leg can thought Initial Point IP Another trick stick plane thats easy fly Polyhedral ships like Oly II Para gon Gemini easy fly Stick same plane keep flying Dont switch air planes Practice landing approach al ways make same approach Youll landing either too short too long learn make proper compensations watch can come land spot time after time after time What about timed landings next step af ter learning make spot landings learn land against watch easiest way have buddy time landing approach IP Once know distance terms time have position normal airspeed time dont need watch So timer will quiet can make normal approach concentrate making 100-point spot landing within couple seconds target time newer airplanes have higher wing loadings have flaps crow Editors note Crow refers Gliders configuration flaps fully extended Down ai lerons fidly extended Up RMcM timed approach can fun because can adjust conditions cheat watch Come high approach fair amount time left watch wont gam bling poor landing because low altitude encountering sink Govern time speed flaps crow elevator youll get time Cross-Country better start high search thermals course Some pilots will fly high can before entering course Others will enter course much sooner search lift along way Continued old timer perfectly proportioned modeling Curtiss Robin 049 EngInes -Channel R/C 41 Wingspan Electric Power Optional $2255 0 Very few full scale ajcraff Ideally soiled model flishf Cs l5 fhe appealing old Curfiss Robin born spruce linen age beautifully proportioned rubber elecfric glow engines Easy end fun build trainerlike performance Flyline Models Cafalog hOt Phono 17031 2739593 INE MODELS INC PO Boa 2136 Faintac VIrginia 22031 USA July 1990 155 w 18 I . 0 G - 4WWaL&ez II b luni your pnaler isIs airfoil plstler FOILED AGAIN! C PLOT AIRFOILS IN ANY CHORD UP TO 24 INCHES MODIFY THICKNESS CAMBER & TRAILING EDGE PLOT SKIN THICKNESS FOR SHEETED WINGS ENTER DATA EASILY 'IA INTELUGENr EDITOR UsER-FRIENDLY MENU-DRIVEN OPERATION INCLUDES Il-PAGE ILLUSTRATED USER MANUAL $4500 naraauaai COok afl ussno~4 asquIas I5MPClflAT uaoo551n.O comma anO Ca mama p0,w Olas oamourC 000r yp Caatas iowan SOS a5 daha Sins atom aaao 00 CYGNET Software714 496-6961 24843 Del Prado #t4lB Dana Point CA 92629 FOAMAIRE 74 IN WING SPAN 6-7 LBS 45-60 POWER 4 OH PLY FOAM AND BALSA WOOD KIT $6995 SEND $100 FOR CATALOGcART 1 NEODESHA KS 66757 OF SAC KITS AND ACC316 325-2821 FREE SHIPPING ON KIT ORDERSISAASTERCARD part country its easy at-newsletter think youll enjoy way ex- density viscosity air unchange tam high altitude hut around Taft CA high al-plains some technical stuffable design purposes titude can achieved quickly Around think wasting time get real high Ofttimes sit listen Hot Shoes talk Rn 6360 x Velocity ft/sec just go Just get up decently high thenabout what should shorten bubble x Length chord ft get goinglengthen transition Guess what Theyre talkSet course wind toward youring about model Gliders Now dont take reference 88 ft/sec ph 44 destination Youll need plane can trim andSo got out Martin Simons book Model Air-30 22 o Glider 10-in-chord just let fly like Paragon big Sagitta Youcraft Aerodynamics published Argus Bookswing flying 30 mph produces Rn cant have plane have fly timeBB Ed Old gave helping233000 will give Reynolds number have able adjust trims let itwhile president new Soartech #8compatible polars find tech manuals go have have ship will thermalthat Herk Stokely sent Princeton pa- Visualize Sand surface wing really easily decide itper Three Amigos sent back 1985air molecules Count grains wing information floating around Iover period time grains er Thanks go Fred Weaver John Dvorakshould able pop bubbles best ofcloser come flying like real airplane letting us pass along great tips Pleasethemless scale effect can count let know would like see Reading through stuff once prettygrains wing increasing speed instructional-type materialdry Oh occasion discussion would livenchord Comprendo up little plane would stall could new catalog Scale ldts available fromsee spinning out sky minds eye 0 Boundary layer area between airTony Amoux Miami Tonys catalog includesThe excitement would build direct proportionfoil surface point above below wing about dozen mostly quarter-scale-size Sail-to Reynolds number overall after asurface air has affected planes German makers Roke Rowingcouple hours Id lose interest chap-passage wing Wik Gliders fly beautifully areters would spaced over few months say top quality Alto included catalog anothing books best way study nar boundary layer visualize page two goodies appeal Scale enthus-and retain informationMany sheets thin paper stacked layer upon iasts Send $4 check refundable order think its time put informa-layer above wing layer moving Imparts Inc. 1736 NW 82 Ave Miami FLtion very consolidated form something likeslower relation wing above 33126Go rebuild later necessary thinkit until closest layer surface moving Competitors F3B should note Tonysit best start Out list definitions withat same speed wing Same hotreal business importing German auto partsthe terms defined rational ordertom surface low-drag condition good source legal Bosch winch ear progresses might stick somepreferable turbulent layerexcept motorsat much lower list prices Write formore high-tech stuff iffin yall dont laughfact laminar flow separates sooner reat detailsat way think about stuff like thistaches much later positive laminar flow low drag What heck guy talking about olds numberhigher efficiency following article Chuck Griswald appeared negative ease will de Thousand Oaks Soaring Society newslet- Air Density/Viscosity x Velocitytach surface difficulty getting ter TOSS-Up Chuck editor fine ngthit reattach PreBuilt MV-i Typhoon * Designed Ron Chidgey * 100% Gator R/O Products Components wing/stab tubes & adjusters canopy & cowl HIGH QUALITY *100% built up construction precision ~g5 ULTRA SWITCH HARNESS * Bob Violetts Magnalite GB 125 used Gold contacts inside switch formersAJI connectoss manufactured * Satisfaction GuaranteedbyFutaba Positive lock Mounting simply requires dnll Thousand sq inWOODORAINS INCing 114 inch hole 100% tested Model Now Available 9 BOX 122Custom cable lengths availble Cumming GA 30130upon request minimal cost 404-889-4758ULTRA SWITCH HARNESS $1995 Tim Megan Richardson PLUS $250 PLUS $600SHIPPING & HANDLING SHIPPING & HANDLINGGa Residents Add 6% Sales Tax 156 Model Aviation E 10 SPAN 30-33 LBS 50-75CC POWER 5-10 LB PAYLOAD OPTIONAL SPREADER KIT $26995 SPDKiT$1995 TRAINER 10 SPAN 19-22 LBS 35-42CC POWER CHOOSE 3 OR 4 OH SLOW AND STABLE 3 CH $14995 4 CH $16495 rOISCOVER HOW GOOD FLYING REALLY CAN BE EAA flying its very best Whether youre pilot builder simply enjoy airplanes EAA Once youve joined become integral part aviations dynamic group EAA can organizationis recognized internationally newsmaker aviation today. pushing cutting edge sport aviation technology new exciting limits adventure can experience others share passion flying JOIN EAA JOIN TODAY $35 ANNUALLY call EAAs TOLL FREE MEMBERSHIP HOTLINE d 4O Major credit cards accepted Something Everyone 0 SPORT AVIATION authoritative monthly magazine . recognized worlds finest aviation publications 0 Three special Divisions interested specific aircraft Antique/Classic AC Aerobatic Warbirds 0 EXPERIMENTER hly publication homebuilding light plane ultralight enthusiasts 0 An extensive chapter network active 700 local areas 0 EAA Technical counselors advise construction projects 0 EAA Family Memberships 0 Specialized aviation insurance coverege 0 EAA Mastercard Gold MasterCard programs S e Bubbles boundary layer becomes de tached usually lower-pressure regions know thickest part wingthe part lift produced Visualize lift pulling sheets paper off surface high point reattaching near trailing edge stagnant area called bubble creases drag dramatically Its just like gluing hunk balsa top wing air mol ecules dont move off wing area As angle attack continues increase after bubble has formed bubble breaks bound ary layer cannot reattach stall occurs e Attached boundary layer stays surface parallel e Detached boundary layer becomes sep arated surface wing bound ary layer may become detached point reattach itself forming bubble may never reattach causing very high drag pos sibly stall s turbulent boundary layer visualize Very fine sand tumbling grain over grain along length airfoil Its rolling motion always thicker laminar flow positive turbulent flow sticks surface longer harder detach com pletely surface negative higher drag laminar flow sition zone area bound ary layer goes laminar turbulentor flow detaches completely Ramps designed airfoils help boundary layer stay attached help reattach af o Hysteresis defined physics fail ure property changed external agent return its original value cause change removed For high-lift hysteresis Princeton papers visualize An airfoil increasing its angle attack AQA point right before stall Mark point mind Now increase AQA just bit get stall Now recover As de crease AOA airfoil must drop below mark minds eye before has recovered again flying high-lift hysteresis leading edge stall bubble breaks right leading edge For moderate-lift hysteresis visualize An airfoil increasing its AQA first did Before reaches stall point seems slow down drag increases would swear someone deployed spoilers al though continue pull Up trim starts look promising AOA increases slightly flying again little Up trim its stall time Just first example old bubble formed time reattached toward trail ing edgea long bubble cause highdrag condition increased AOA trailing edge bubble started forward again drag decreased Now since little good bit must better Wrong Back high-lift hysteresis leading edge stall would anyone fly plane like have flown Gliders use E-205 airfoila Sagitta exam ple Did anyone say Hey buddy got fly plane fastget step someone thought Maybe put turbulator strip dont have scream around sky Hes right turbulator strip explained next paragraph RMcM course idea Eppler airfoils keep laminar longer cut down drag Well best-laid plans etc e Turbulators trip up laminar flow start sand rolling over surface wing raises drag bit keeps boundary layer surface longer keeps dreaded bubble forming soon full-size aircraft flow seldom lami nar Reynolds numbers high panel line rivet will start turbulent flow RC Gliders Rns below million air appears viscous therefore remains lam inar over larger imperfections turbulate wing apiece trim tape 0010 thick / wide will usually trick OK havent bored tears think about Its going take think up some high-tech stuff just listened CO Top Gun Squadron Miramar try explain G forces TV program Wings dont feel bad Just scream holler cant take promise stop Dont stop Chuck often takes different slant technical explanations before light bulb goes know enjoyed reading Continued page 161 July 1990 157 Full participation EAAs famous OSHKOSH Fly-In Convention many benefits Get full story. ter bubble has formed low Rns like ramps designed cover upper surface airfoil dont look chances wont find RC Soaring/Blakeslee Continued page 157 Chuck Griswalds visualizations hope helped some readers understand what Hot Shoes arc talking about Masters Soaring contest very presti gious because limited fliers having outstanding qualifications Only LSF Level IVs Vs Nats winners eligible Mas ters cosponsored National Soaring Soci ety NSS President Pete Carr kindly sent report March 1990 Masters Soaring contest hosted Silent Wings Soaring Associa tion SWSA West Covina CA directed Pete Olsen site school mid dle town surrounded homes hospital factories Launch equipment Rahm winches retrievers very snappy worked flawlessly during 14 rounds Pete last years Masters CD Myles Mo ran came up mix flight times land ing tasks really tested pilots first landing task runway four feet wide 20 feet long divided five squares point values 20 30 40 30 20 other landing used standard 25-foot tape 100-point max cases runway land ing eliminated loud landings mentioned 89 report Winds calm time light easy-to-find lift Notable among entrants Brian Ag new age 24 Florida flying Ed Bertons new 35-meter Phoenix kits ATRCS-modified Airtronics Module radio early rounds Don Edberg fought lead few points apart Joe Wurts close behind flying Falcon 880 Three pilots flew hot new Mark Allen Falcon con test including eventual winner Bob McGowan northern California nine Air tronics Vision radios use several ATRCS-modified 7SPs making Airtronics RF link choice Masters three Geminis two Paragons flown both ing Ed Slobod designs two crashes during contest Rich Garners Larry Jolly Model Products Chee tah broke elevator pushrod zoom destroyed wing uses balsa ribs full balsa sheeting displayed amazing strength spite terrible flutter set up stab other crash saw Brian Agnews Phoenix tuck inverted dive altitude 100 ft circling landing pattern last round appeared airborne battery failed since little warning trouble Brian Phoenix made impressive show ing finished ninth place spite zero last landing top 10 1 Bob McGowan 1000 Pt Falcon 880 2 Terry Koplan 997 Pt Vi king 3 Joe Wurts 996 pt Falcon 880 4 Chris George 994 pt Hyperlaun 5 Don Edberg 991 pt Quattro 6 Craig Foxgord 86 Pt original design 7 Larry Jolly 986 pt poly Two-Meter 8 Fred Weaver 983 pt Falcon 880 9 Brian Agnew 982 Pt Phoenix 10 Keith Kindrick 978 pt original design 1991 Masters may Florida Brian Agnew going check possible sites subject landing tasks continues expand suggestion half-circle used 100point spot would usual place up wind half would zero points may both half-circle runway will used next year SWSA club CD Pete Olsen de serve hearty Well done putting truly Masterful event Attention F3J enthusiasts case dont rec ognize term F3J new provisional FAI class Thermal Duration Gliding short notice first FAI-sanctioned F3J contest will BARCS-sponsored Interglide 1990 held Warwick England July 21-22 1990 have forgotten exact procedure must something like five contests least three countries competing before F3J will recognized world championship event FAI F3H class Cross-Country Glider flying has struggling requirement years may never get recognized opinion need F3J class addi tion F3B Multi-Task flying huge num ber pilots specialize Thermal flying can have opportunity get together recog nized FAI world championships event plan central England third week July please contact Sam Hitchman 7 Veiny Close Lighthorn Nr Warwick CV35 OAZ Eng land tel 0926-651511 will need nonBritish pilots make FAt-recognized Inter national event Wouldnt surprised might supply Glider tower get nonBritish entry tower thats pronounced tow-er reference pertains fact F3J rules specify hand towing 150-meter line Hand towing common method launching Britain unknown US Id appreciate someone experience hand towing would write order let us know its ins outs responding advertisers mention read about Model Aviation THE LEADER IN COMPETITION - SERIES 100 DIAPRICE 16 NEW 4 0 Ii NEW HIGH TECH AIRFOIL SECTION 10T020%INCREASE IN THRUST MFG OF SELECT HARD MAPLE WOOD WILL NOT FATIGUE LIKE SYNTHETICS FUEL PROOF HIGH LUSTER FINISH DIA PITCHPRICE 5/a34 634 72a33456 833456a 84S66/e7 94566/i77 1045667 106W8W 10SEW 114677/,778 115W 116EW 1l/u67 124W0 12SW0 1256 1356 1456 1556 164N 16678 RC PYLON RACING SERIES 500 DIA PITCHPRICE 75N 5/uH0 516776 SERIES 400C 86/o6t4777 977/t7 W WIDE BLADE EW EXTRA WIDE N NARROW July 1990 161 PROPELLERS CYCLE TAILORED HELICAL PITCH DEVELOPED TO GIVE MAXIMUM THRUST AT 4 CYCLE ENGINE RPM ALL THE LATEST TECHNIQUES USED ON OUR PRO SERIES 3 SEE BELOW PITCH THP 66/o778 677/e 8 677 8 67 678 PRO SERIES 3 LOW WING SHARKLT$9295 SHOULDER WING SHARKST5849a 0 65 Quel' SuIou & Hudwu SinPn-Built Jet U Lightest Pilot PILOT BUST has Modern Jet Helmet Face Mask Oxygen ... REALISTIC Weighs Less Hall Ounce. See Deuler No308 1/8 Scale s5O New Yoi State Outidenit No307 1/7 Scale s8% Add 7S ScanT U LJU EJ Ireii U DISIGNID DGVDLOPED IS CHRIS MACHE RICHMOND OUSTON TX 77056 FLY posvinnuas FUEL FROM KINGSWAY
Edition: Model Aviation - 1990/07
Page Numbers: 46, 47, 154, 155, 156, 157, 161
IVE READ Fred Flies Fred talking about Fred Weaver San Jose CA Fred third person achieve LSF Level V completing rigorous test 1976 John Baxter Steve Work got Level Vs 1975 Gliders equipment available days finishing Level V especially tough jobstill matter Fred three-time winner very popular prestigious Visalia Fall Soaring Festival win ning last year trusty Airtronics Cumic can appreciate credentials Fred has built up storehouse Soaring knowl edge uld wonderful burrow could So saw Fred Flies piece editor John Dvorak South Bay Soaring So ciety newsletter Silent Flyer knew fliers would want read Actually what John did transcribe talk Fred gave club meeting talk included much material questionand-answer type Johns report what Fred said figure Out lift some basic easy-to-understand things to plan before launch come off tow plane will either glide less straight rise sink turn way other Launching right lift won derful doesnt happen too often need know what other things occurs plane turns right itself indi cates lift left pushing plane away must steer opposite way plane wants go turning left get thermal Sink bad least indicates unstable air some mass air going up some other air coming down replace later straight normal glide no up/down bumps left/right turns bad news because indicates air probably stable no ther mals being generated thing case cruise planes best glide ratio try cover much ground possible look ing some kind lift What best lift generators Any dark surface such parking lots pavement rooftops done tar ything dark colored Dark surfaces absorb heat sun warm air adjacent sur rounding air mass warms sufficiently breaks free rises rising patch air pulls air immediate area replace Any dark surface next structures surfaces light colored will especially 46 Model Aviation Radio Conoi Soaring Byron Blakeslee 3134 N Winnebago Dr Sedalla Co 90135 Top placers Memphis Area Soaring Societys 1988 Fail Soaring Tournament LR Ron Stanfield Bob Sowder Neal Jacobs Bill Jenkins Dick Renakers Chip Gibbs Photo sent MASS president Bob Sowder looks like flew interesting mix designs Bernie Coleman Charlotte NC very nice quarter-scale LS-4 Rowing kit Aile ron servos built glass wings Rowing planes available through Tony Arnoux Look againl Thats really figurine posed front Bill Wynans beautiful Va-scale ASW 20 Kit available American Sailplane Designs San Diego CA realistic can get effective because difference surface tem peratures rural areas plowed ground next planted light-colored crops produces differences surface temperatures thus creates ther mals middle square mile asphalt would fewer thermals fringes would thermal activity because temperature difference effect What best search pattern use Tony Arnoux Miami FL 1 35-scale DG 202 Rake Modeile Germany Gor geous Sailplane features all-glass construc tion available through Tonys Imparts Co Tony has new catalog Scale Sailplanes See column information GOLDEN EDmON WE OFFER THE BEST HERES WHY 4 days covered w/good continuity Professional multi camera coverage Vast editing w/complete scenes Excellent narration & music Dynamic indoor showcase static dispiay Over 75 entries w/fuIl model & pilol reports Flighi analysis w/fuII size counterparts Reflections past masters events winners Banquei coverage w/awards & roasting ceremonies ENDORSED BY SCALE MASTERS BOARD SPONSORED BY h3 ER -K & B RUN TIMES APPROX 314 HRS TOTAL RETAIL PART 1 5995 PART 2 5495 SPECtAL ONLY 4795 / 4495 BOTh FOR ONLY 3705 SAVE 2700 XJU syria nt,j rat FOX DONT SETrLE FOR CHEAP SEMIPROFESSIONM COPIES GO WITH THE BEST ALL VIDEOS ON QUALITs MAXELL TAPE W/DELUXE CASES TO ZiNVITATIONAL TOURNAMENT OVER 14 HRS VALUED PRICED REG PR $4995 YOURS FOR ONLY $3995 BUY ANY 3 VIDEOS AT RETAIL PICK 4TH ONE FROM BELOW 11-71 FREE OTHER GREAT VIDEOS 1Airplane Funnies 30 mins3495 2Basic Conat Beginners 107 mins4195 31984 Scale Masters 60 mins3495 41987 Scale Masters 64 mins3995 51988 Scale Masters 90 mica2995 6Warhirds Action SO mins4495 7WhIch Way Up Aerobatirsl 70 mins4495 ORDERING Check MO Visa/Master Card Include phone no orders 350 Shippin 100 per extra No CODs nada res add6 tiotial others aJd 12% tiotal ACADEMY OF AVIATION R & D PO BOX 277 l Crest IL 60429 7083350776 Sales Final PRICES SUBJECT TO CHANGE WITH OUT NOTICE July 1990 47 Asher Charmichaci Mobile AL steadies 5-meter-wingspan 1A-scale SB 10 Rake kit available through Tony Arnoux Scale Nasfrr Continued page 154 1 iv utiucri Send $100 coupon address toADDRESS ar Ave ____________________________ ________ N NJ 07922CITYSTATEZIP L SPECIALISTSINCUSTOMCOX TEE DEE & REED ENGINES 020S 049S 051S 074S & 09S ALLCUSTOM&STOCKPARTS VAILABLE INDIWDUALL V COMPETITIONACCESSORIES RACING WHEELS KLOTZOIL CARBON FIBER SOLID LINES ALL KINDS OFFUEL TUBING THREE BRA NDSOFGLOWPL UGS HA RD-TO-FIND HA RD WARE OLD TIMER SUPPLIES COILS CONDENSERS NGK& STIlT SPARKPLUGS SILK8 COLORS QUA LITYDOPE BRUSHES 5& 7LOOP 1/4RUBBER BANDS TRANSISTORIGNITIONSYSTEMS RESISTOR HIGH TENSIONLEADS 1/2A TEXACO PLA YBOYSR KIT 1/2A TEXACO ENGINES & PARTS KSB & IGNITION TIMERS RUBBERPOWERKITS PROPS TISSUEAND OTHER SUPPLIES C VA NOA CR YLA TES & EPOXIES ORDER BY MAIL OR PHONE 619 7284365 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING HANDLING AND INSURANCE FEE $300 STOCK ORDERS SHIPPED WITHIN 24 HRS RC Scale/Aune Continued page 151 Equal C read 327 Therefore make 327-in circle piece aluminum cut pop can compass cut out scissors rough up underside 80-grit sandpaper glue fuselage us ing RC-56 glue Note will need measure calculate location panel well us ing same method have found great value Scale modeling has come result building flying per severing giving Rewards always lag behind effort life Happy building RC Soaring/Blakeslee Continued page 47 come off tow best cheat some already something scooting over best pattern pays know whats going air before launch Failing having other information lo cal hot spots observing birds bugs etc fly straight upwind watch see plane drifts right left drifting side whats happening plane being sucked some sink will likely thermal other side wing tip suddenly moves up edge thermal trick turn back toward thermal try find core go straight out cant find anything plane getting small hard see dont just turn around come straight back cause youll flying through same air just searched Go off side other circle back wind will help bring plane back What signs fly right middle thermal What youll see plane speeding up tail rising control re sponse improving Whenever see tail airplane go up know its lift Thats can give little rudder aileron pull back stick go Youre make tail Glider sensi tive lift center-of-gravity balance point should far rearward can fly ie Glider being prone stalling too squirrelly fly What happens sink plane becomes sluggish tail may drop slightly Never fly plane tail down Push nose down zip through body sink Something making air go down air somewhere around going up fly another hundred feet should lift Never circle sink never hold Up eleva tor sink its like putting brakes Up el evator does make Glider go uponly up air makes go up rule Speed up sink slow down lift Sink bad because dicates must thermal nearby have quickly fly through patch sink other side up air core thermal have use Glider identify boundaries ther mal paint mental picture what looks like After plane detects thermal dont im mediately start circling Fly straight think thermal until plane stops go ing up identifies other side ther mal Make turn back thermal upwind direction headed upwind sink encountered youve identified another bounda ry thermal So move turn downwind slightly get back thermal lower plane faster has done Low thermals small dont have much altitude play wind blowing 5 mph thermal also drifting speed higher get faster thermal will drift Winds higher altitudes usually stronger ground level As gain alti tude thermal becomes larger can open up turn make bigger circles Al ways drift toward side circle producing strongest lift should stay cored What plane high ther mal want find another thermal because getting too far downwind away field Dont head straight back upwind Thats sink feeding ther mal youre Instead head back upwind an gle left right wind direction What about launching sink ready launch wind picks up Thermal lift headed downwind know youll launching right sink 1 Quickly launch chase thermal downwind 2 Stand winch try zoom off angle next thermal 3 Come up servo problem Sandbagging option 3 unsportsmanlike decision have make hurry based fast thermal moving what kind plane youre flying Gentle Lady 154 Model Aviation SUNBIRD SENSATION WITH STYLE Sunbird combines eye opening performance truly distinctive styling terrific flying design Whether choose 40 size Sunbird 10 Sunbird Jr youll find Sunbird perfect sport plane %fl PRECISION PRODUCTS INC 714 592-5144 510 E Arrow Highway San Dimas CA 91773 JUN lIt V-UIIVVtIVI LJIf V VERA GES OVER 9000 PROPS I! IMMEDIA TESHIPMENTON WSA/MC summer 1940 Jim Walker introduced A-J Fireball U-Control world Countless thousands got first taste model aviation excitement building flying famous airplane commemorate 50th Anniversary birth A-J Fireball proudly announce special limited-edition kit Jim Walkers 1940 original kit contains U fully carved Balsa fusealage Balsa wing tail parts cut shape U hardware hardwood motor mount U decals U complete instructions illustrations U brief history A-J Fireball Offered limited edition 50th Anniversary A-J Fireball numbered dated signed just like kits first produced 1940 can make 60 kits available per month order yours TODAY YES Enclosed check money order $17950 YES cant decide Please send information A-J Manutacturing Inc PO Box68132 Portland OR 97268 503 653-2038 CAN ib 40 fj M* % going zoom So its best have understand ing options prior stepping up winch dont want waste time deciding what greatest thing world being ready launch having gentle breeze come up behind Its wrong direction means downwind launchbut will directly thermal What has happened breeze feel air feeding thermal just front Rule sudden shift direction breeze indicates local thermal present breeze blowing toward thermal What wave action Sometimes windy days youll find fixed ridge wave lift Making S-turns back forth along wave will sustain flight lift plane higher altitudes lift acts like slope lift created wind bounces off side hill may hang out 20 minutes sud den disappear Wave lift may caused sur face features upwind difference temperature layers pressure tree line get good spot landings things guarantees spot landings making same approach single time first thing figure out land plane spot means practicing downwind ap proach turn wind final glide straight spot As wind picks up can shorten downwind leg turn soon er Onto final approach spot sky start downwind leg can thought Initial Point IP Another trick stick plane thats easy fly Polyhedral ships like Oly II Para gon Gemini easy fly Stick same plane keep flying Dont switch air planes Practice landing approach al ways make same approach Youll landing either too short too long learn make proper compensations watch can come land spot time after time after time What about timed landings next step af ter learning make spot landings learn land against watch easiest way have buddy time landing approach IP Once know distance terms time have position normal airspeed time dont need watch So timer will quiet can make normal approach concentrate making 100-point spot landing within couple seconds target time newer airplanes have higher wing loadings have flaps crow Editors note Crow refers Gliders configuration flaps fully extended Down ai lerons fidly extended Up RMcM timed approach can fun because can adjust conditions cheat watch Come high approach fair amount time left watch wont gam bling poor landing because low altitude encountering sink Govern time speed flaps crow elevator youll get time Cross-Country better start high search thermals course Some pilots will fly high can before entering course Others will enter course much sooner search lift along way Continued old timer perfectly proportioned modeling Curtiss Robin 049 EngInes -Channel R/C 41 Wingspan Electric Power Optional $2255 0 Very few full scale ajcraff Ideally soiled model flishf Cs l5 fhe appealing old Curfiss Robin born spruce linen age beautifully proportioned rubber elecfric glow engines Easy end fun build trainerlike performance Flyline Models Cafalog hOt Phono 17031 2739593 INE MODELS INC PO Boa 2136 Faintac VIrginia 22031 USA July 1990 155 w 18 I . 0 G - 4WWaL&ez II b luni your pnaler isIs airfoil plstler FOILED AGAIN! C PLOT AIRFOILS IN ANY CHORD UP TO 24 INCHES MODIFY THICKNESS CAMBER & TRAILING EDGE PLOT SKIN THICKNESS FOR SHEETED WINGS ENTER DATA EASILY 'IA INTELUGENr EDITOR UsER-FRIENDLY MENU-DRIVEN OPERATION INCLUDES Il-PAGE ILLUSTRATED USER MANUAL $4500 naraauaai COok afl ussno~4 asquIas I5MPClflAT uaoo551n.O comma anO Ca mama p0,w Olas oamourC 000r yp Caatas iowan SOS a5 daha Sins atom aaao 00 CYGNET Software714 496-6961 24843 Del Prado #t4lB Dana Point CA 92629 FOAMAIRE 74 IN WING SPAN 6-7 LBS 45-60 POWER 4 OH PLY FOAM AND BALSA WOOD KIT $6995 SEND $100 FOR CATALOGcART 1 NEODESHA KS 66757 OF SAC KITS AND ACC316 325-2821 FREE SHIPPING ON KIT ORDERSISAASTERCARD part country its easy at-newsletter think youll enjoy way ex- density viscosity air unchange tam high altitude hut around Taft CA high al-plains some technical stuffable design purposes titude can achieved quickly Around think wasting time get real high Ofttimes sit listen Hot Shoes talk Rn 6360 x Velocity ft/sec just go Just get up decently high thenabout what should shorten bubble x Length chord ft get goinglengthen transition Guess what Theyre talkSet course wind toward youring about model Gliders Now dont take reference 88 ft/sec ph 44 destination Youll need plane can trim andSo got out Martin Simons book Model Air-30 22 o Glider 10-in-chord just let fly like Paragon big Sagitta Youcraft Aerodynamics published Argus Bookswing flying 30 mph produces Rn cant have plane have fly timeBB Ed Old gave helping233000 will give Reynolds number have able adjust trims let itwhile president new Soartech #8compatible polars find tech manuals go have have ship will thermalthat Herk Stokely sent Princeton pa- Visualize Sand surface wing really easily decide itper Three Amigos sent back 1985air molecules Count grains wing information floating around Iover period time grains er Thanks go Fred Weaver John Dvorakshould able pop bubbles best ofcloser come flying like real airplane letting us pass along great tips Pleasethemless scale effect can count let know would like see Reading through stuff once prettygrains wing increasing speed instructional-type materialdry Oh occasion discussion would livenchord Comprendo up little plane would stall could new catalog Scale ldts available fromsee spinning out sky minds eye 0 Boundary layer area between airTony Amoux Miami Tonys catalog includesThe excitement would build direct proportionfoil surface point above below wing about dozen mostly quarter-scale-size Sail-to Reynolds number overall after asurface air has affected planes German makers Roke Rowingcouple hours Id lose interest chap-passage wing Wik Gliders fly beautifully areters would spaced over few months say top quality Alto included catalog anothing books best way study nar boundary layer visualize page two goodies appeal Scale enthus-and retain informationMany sheets thin paper stacked layer upon iasts Send $4 check refundable order think its time put informa-layer above wing layer moving Imparts Inc. 1736 NW 82 Ave Miami FLtion very consolidated form something likeslower relation wing above 33126Go rebuild later necessary thinkit until closest layer surface moving Competitors F3B should note Tonysit best start Out list definitions withat same speed wing Same hotreal business importing German auto partsthe terms defined rational ordertom surface low-drag condition good source legal Bosch winch ear progresses might stick somepreferable turbulent layerexcept motorsat much lower list prices Write formore high-tech stuff iffin yall dont laughfact laminar flow separates sooner reat detailsat way think about stuff like thistaches much later positive laminar flow low drag What heck guy talking about olds numberhigher efficiency following article Chuck Griswald appeared negative ease will de Thousand Oaks Soaring Society newslet- Air Density/Viscosity x Velocitytach surface difficulty getting ter TOSS-Up Chuck editor fine ngthit reattach PreBuilt MV-i Typhoon * Designed Ron Chidgey * 100% Gator R/O Products Components wing/stab tubes & adjusters canopy & cowl HIGH QUALITY *100% built up construction precision ~g5 ULTRA SWITCH HARNESS * Bob Violetts Magnalite GB 125 used Gold contacts inside switch formersAJI connectoss manufactured * Satisfaction GuaranteedbyFutaba Positive lock Mounting simply requires dnll Thousand sq inWOODORAINS INCing 114 inch hole 100% tested Model Now Available 9 BOX 122Custom cable lengths availble Cumming GA 30130upon request minimal cost 404-889-4758ULTRA SWITCH HARNESS $1995 Tim Megan Richardson PLUS $250 PLUS $600SHIPPING & HANDLING SHIPPING & HANDLINGGa Residents Add 6% Sales Tax 156 Model Aviation E 10 SPAN 30-33 LBS 50-75CC POWER 5-10 LB PAYLOAD OPTIONAL SPREADER KIT $26995 SPDKiT$1995 TRAINER 10 SPAN 19-22 LBS 35-42CC POWER CHOOSE 3 OR 4 OH SLOW AND STABLE 3 CH $14995 4 CH $16495 rOISCOVER HOW GOOD FLYING REALLY CAN BE EAA flying its very best Whether youre pilot builder simply enjoy airplanes EAA Once youve joined become integral part aviations dynamic group EAA can organizationis recognized internationally newsmaker aviation today. pushing cutting edge sport aviation technology new exciting limits adventure can experience others share passion flying JOIN EAA JOIN TODAY $35 ANNUALLY call EAAs TOLL FREE MEMBERSHIP HOTLINE d 4O Major credit cards accepted Something Everyone 0 SPORT AVIATION authoritative monthly magazine . recognized worlds finest aviation publications 0 Three special Divisions interested specific aircraft Antique/Classic AC Aerobatic Warbirds 0 EXPERIMENTER hly publication homebuilding light plane ultralight enthusiasts 0 An extensive chapter network active 700 local areas 0 EAA Technical counselors advise construction projects 0 EAA Family Memberships 0 Specialized aviation insurance coverege 0 EAA Mastercard Gold MasterCard programs S e Bubbles boundary layer becomes de tached usually lower-pressure regions know thickest part wingthe part lift produced Visualize lift pulling sheets paper off surface high point reattaching near trailing edge stagnant area called bubble creases drag dramatically Its just like gluing hunk balsa top wing air mol ecules dont move off wing area As angle attack continues increase after bubble has formed bubble breaks bound ary layer cannot reattach stall occurs e Attached boundary layer stays surface parallel e Detached boundary layer becomes sep arated surface wing bound ary layer may become detached point reattach itself forming bubble may never reattach causing very high drag pos sibly stall s turbulent boundary layer visualize Very fine sand tumbling grain over grain along length airfoil Its rolling motion always thicker laminar flow positive turbulent flow sticks surface longer harder detach com pletely surface negative higher drag laminar flow sition zone area bound ary layer goes laminar turbulentor flow detaches completely Ramps designed airfoils help boundary layer stay attached help reattach af o Hysteresis defined physics fail ure property changed external agent return its original value cause change removed For high-lift hysteresis Princeton papers visualize An airfoil increasing its angle attack AQA point right before stall Mark point mind Now increase AQA just bit get stall Now recover As de crease AOA airfoil must drop below mark minds eye before has recovered again flying high-lift hysteresis leading edge stall bubble breaks right leading edge For moderate-lift hysteresis visualize An airfoil increasing its AQA first did Before reaches stall point seems slow down drag increases would swear someone deployed spoilers al though continue pull Up trim starts look promising AOA increases slightly flying again little Up trim its stall time Just first example old bubble formed time reattached toward trail ing edgea long bubble cause highdrag condition increased AOA trailing edge bubble started forward again drag decreased Now since little good bit must better Wrong Back high-lift hysteresis leading edge stall would anyone fly plane like have flown Gliders use E-205 airfoila Sagitta exam ple Did anyone say Hey buddy got fly plane fastget step someone thought Maybe put turbulator strip dont have scream around sky Hes right turbulator strip explained next paragraph RMcM course idea Eppler airfoils keep laminar longer cut down drag Well best-laid plans etc e Turbulators trip up laminar flow start sand rolling over surface wing raises drag bit keeps boundary layer surface longer keeps dreaded bubble forming soon full-size aircraft flow seldom lami nar Reynolds numbers high panel line rivet will start turbulent flow RC Gliders Rns below million air appears viscous therefore remains lam inar over larger imperfections turbulate wing apiece trim tape 0010 thick / wide will usually trick OK havent bored tears think about Its going take think up some high-tech stuff just listened CO Top Gun Squadron Miramar try explain G forces TV program Wings dont feel bad Just scream holler cant take promise stop Dont stop Chuck often takes different slant technical explanations before light bulb goes know enjoyed reading Continued page 161 July 1990 157 Full participation EAAs famous OSHKOSH Fly-In Convention many benefits Get full story. ter bubble has formed low Rns like ramps designed cover upper surface airfoil dont look chances wont find RC Soaring/Blakeslee Continued page 157 Chuck Griswalds visualizations hope helped some readers understand what Hot Shoes arc talking about Masters Soaring contest very presti gious because limited fliers having outstanding qualifications Only LSF Level IVs Vs Nats winners eligible Mas ters cosponsored National Soaring Soci ety NSS President Pete Carr kindly sent report March 1990 Masters Soaring contest hosted Silent Wings Soaring Associa tion SWSA West Covina CA directed Pete Olsen site school mid dle town surrounded homes hospital factories Launch equipment Rahm winches retrievers very snappy worked flawlessly during 14 rounds Pete last years Masters CD Myles Mo ran came up mix flight times land ing tasks really tested pilots first landing task runway four feet wide 20 feet long divided five squares point values 20 30 40 30 20 other landing used standard 25-foot tape 100-point max cases runway land ing eliminated loud landings mentioned 89 report Winds calm time light easy-to-find lift Notable among entrants Brian Ag new age 24 Florida flying Ed Bertons new 35-meter Phoenix kits ATRCS-modified Airtronics Module radio early rounds Don Edberg fought lead few points apart Joe Wurts close behind flying Falcon 880 Three pilots flew hot new Mark Allen Falcon con test including eventual winner Bob McGowan northern California nine Air tronics Vision radios use several ATRCS-modified 7SPs making Airtronics RF link choice Masters three Geminis two Paragons flown both ing Ed Slobod designs two crashes during contest Rich Garners Larry Jolly Model Products Chee tah broke elevator pushrod zoom destroyed wing uses balsa ribs full balsa sheeting displayed amazing strength spite terrible flutter set up stab other crash saw Brian Agnews Phoenix tuck inverted dive altitude 100 ft circling landing pattern last round appeared airborne battery failed since little warning trouble Brian Phoenix made impressive show ing finished ninth place spite zero last landing top 10 1 Bob McGowan 1000 Pt Falcon 880 2 Terry Koplan 997 Pt Vi king 3 Joe Wurts 996 pt Falcon 880 4 Chris George 994 pt Hyperlaun 5 Don Edberg 991 pt Quattro 6 Craig Foxgord 86 Pt original design 7 Larry Jolly 986 pt poly Two-Meter 8 Fred Weaver 983 pt Falcon 880 9 Brian Agnew 982 Pt Phoenix 10 Keith Kindrick 978 pt original design 1991 Masters may Florida Brian Agnew going check possible sites subject landing tasks continues expand suggestion half-circle used 100point spot would usual place up wind half would zero points may both half-circle runway will used next year SWSA club CD Pete Olsen de serve hearty Well done putting truly Masterful event Attention F3J enthusiasts case dont rec ognize term F3J new provisional FAI class Thermal Duration Gliding short notice first FAI-sanctioned F3J contest will BARCS-sponsored Interglide 1990 held Warwick England July 21-22 1990 have forgotten exact procedure must something like five contests least three countries competing before F3J will recognized world championship event FAI F3H class Cross-Country Glider flying has struggling requirement years may never get recognized opinion need F3J class addi tion F3B Multi-Task flying huge num ber pilots specialize Thermal flying can have opportunity get together recog nized FAI world championships event plan central England third week July please contact Sam Hitchman 7 Veiny Close Lighthorn Nr Warwick CV35 OAZ Eng land tel 0926-651511 will need nonBritish pilots make FAt-recognized Inter national event Wouldnt surprised might supply Glider tower get nonBritish entry tower thats pronounced tow-er reference pertains fact F3J rules specify hand towing 150-meter line Hand towing common method launching Britain unknown US Id appreciate someone experience hand towing would write order let us know its ins outs responding advertisers mention read about Model Aviation THE LEADER IN COMPETITION - SERIES 100 DIAPRICE 16 NEW 4 0 Ii NEW HIGH TECH AIRFOIL SECTION 10T020%INCREASE IN THRUST MFG OF SELECT HARD MAPLE WOOD WILL NOT FATIGUE LIKE SYNTHETICS FUEL PROOF HIGH LUSTER FINISH DIA PITCHPRICE 5/a34 634 72a33456 833456a 84S66/e7 94566/i77 1045667 106W8W 10SEW 114677/,778 115W 116EW 1l/u67 124W0 12SW0 1256 1356 1456 1556 164N 16678 RC PYLON RACING SERIES 500 DIA PITCHPRICE 75N 5/uH0 516776 SERIES 400C 86/o6t4777 977/t7 W WIDE BLADE EW EXTRA WIDE N NARROW July 1990 161 PROPELLERS CYCLE TAILORED HELICAL PITCH DEVELOPED TO GIVE MAXIMUM THRUST AT 4 CYCLE ENGINE RPM ALL THE LATEST TECHNIQUES USED ON OUR PRO SERIES 3 SEE BELOW PITCH THP 66/o778 677/e 8 677 8 67 678 PRO SERIES 3 LOW WING SHARKLT$9295 SHOULDER WING SHARKST5849a 0 65 Quel' SuIou & Hudwu SinPn-Built Jet U 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