RADIO CONTROL SOARING MY JUNE 1993 COLUMN piece compared three airfoils 53021 Michael Seligs redesign Eppler 205 SD7037PT Princeton Test airfoil built Harley Michaelis real SD7037 designed Selig Donovan Fritz Bien pointed out Michaelis built SD7O37PT airfoil actually shaped closer S3021 SD7037 Michael Selig agreed Fritz want obtain performance shown Soartech #8 Princeton wind tunnel test data compiled youd better make wing airfoil same Harley built fact nobody knows Michaelis-built SD7O37PT compares real SD7037 Fritzs conclusion airfoil Harley made right approach having great drag polar lOOK Re range main difference between Michaelis airfoil 53021 SD7037 entry angle front top surface shallower 0030 inches out 12-inch chord Fritz went suggest Harley created super-airfoil Maybe should designated SDM7037 honor Harley Since offic4il coordinates available builders need look Airfoil Comparison Plots section back Soartech #8 learn what SDM7037 looks like Anyway Harley read aerodynamic theory June column much interest good humor kind enough sit down write us letter describing whole episode also brings up problems arise try build perfect wing think sailplane builders will find much wonder about Heres Harleys letter think should dispel notion building SD7037 model tested Princeton did some great insight Results matter blind luck rather planning part truth step initial plotting final glassing provided opportunity unintentionally stray original coordinates prepared plots Chuck Andersons Airfoil Plotting Program using nine-pin dot-matrix printer old two- floppy-disk computer specifying 146 inch skin thickness 120-inch chord plot sent paper plots Bob Sealy made templates cut cores Obviously can take no credit cores work Now new 24-pin printer new computer still see minor variations identical plots evidenced laying plywood template weren t variations making templates thickness plot line presents source error airfoil represented outer perimeter plot line inner perimeter middle line Having made guess making templates able cut wavering intended path Really cut down middle assuming cut blade width distorts things thinnest blade makes cut about 020inch wide Thats 010-inch either side represents substantial deviation tolerances over 004-inch significant Michael Selig notes Next cutting core what mischief does hot wire example wrong wire wrong diameter too hot too cold sagging dragging unequal travel speed etc What happening wire briefly hangs up rough spot template smooth flat sanding block skinning use A6-inch sheeting skins some may under dimension some over some thinner edge As sand out irregularities airfoil being distorted Fashioning both leading edge trailing edge present opportunity distort still am unable make female LE template accurately rigid material using modelers tools find cant smoothly cut inside LE radius finest band saw blade end up hacking away jewelers files until template resembles intended contour 52 Model Aviation awley Buena Park CA says Leon Kincaid-designed Heat Seeker f lies super couldnt satisfied Thermal Thing glider Future Flight New Rol Klingberg design good simple glidersee text details 1930 Vintage Secondary Glider built scale Rich Tanis Hawthorne NJ test-glide hill Goffle Brook Park Hawthorne Again judge contour placing over yet another plot suspect accuracy Although friend Harry Smith cuts great cores inevitably LE shaping time discover structure does lend itself being shaped like template Its either too thick too thin times see discrepancies up 1A6-inch can far off So resort eyeball engineering modelers friend TLAR [that looks about rightBR] system building multiple-tapered wing surely have template increment did sanding blocks fiat have no tools accurately shape rounded radius descending dimensions Much said about keeping TE thin since impractical feather zero distortion inevitable Most wings have seen display disproportionate TE thickening represents builders limitation feather out wish some strength making 5D7037 model wind tunnel didnt need concerned about practicality field So extended fiberglass cloth layers together paper-thin surface likely impacted numbers favorabW impractical real world practice always make plot overlengthsay l0/16 inches actual chord 10 inches build wing 10-inch chord about 1/sninch thick TE 0007-inch carbon fiber laminate between 1A6-inch skins clearly TE distortion realistic trade-off bagging glass cloth directly over core TE thinner looks great subject easy chipping others raving about PT 5D7037 [92% thick 302% camber BR] thought should build wing Jouster design [construction article July 1993 MA-BR give airfoil best chance took particular care building wing Compared unheralded S2091 improved Aquila airfoil 101% thick 391% camber 5D7032 995% thick 366% camber impressed ship did get high tow kept boring higher speed handle well far less favorable stall characteristics did stay up well marginal lift seemed cruise faster could advantageous wind came hotter landing conclusion preferred other two airfoils mentioned Did get wing 5D7037 comparable Princeton model would know would builder know Sometimes think popularity airfoil product 1 some skilled flier happens win NATS 2 some prominent kit maker arbitrarily decides use based 1 3 everybody using must good fortunate have fine airfoil choices efforts Michael Selig John Donovan David Fraser builders provided models Princeton tests However talk about airfoils think should remember such things sound basic airframe design well-made wellaligned surfaces proper matching washout correct CG etc plenty practice vital success airfoil unquestioned superiority given application expected results would achieved October 1993 53 Now ou LAUNCH 01117 SOAR AND OUTIT LAND FOR LESS Genesis all-composite precision-molded thermal duration competition model manufactured US today Synergy F3B models highly competitive everything thermal duration slope racing Limited time pricing Genesis $449 Synergy III $599 Synergy 91 $549 SB/XC $749 Available exclusively Slegers International 201 366-0880 RnR Products 1120 Wrigley Way Milpitas CA 95035 408 946-4751 continued page SS GIANT SCALE MODELS CESSNA 150/152 10 SPAN 1/3 SCALE $475 DIASOLO gre SPAN 35% SCALE $285 VARIANT II 87 SPAN SPORT $16995 ulI shoil kits avaIlable acceasorlsa available amlsly Call writs free brochure ahowhg full prices hiciuds alsln Dsalsr Inquirsa Invited CmCEUEL 4302N 750W Ugcnier IN 46767 C219J S94-3370 Skimmer six- seven-cell electric glider Hobby Lobby offers another way launch good-flying thermal model R/C Combat Gremlin RUM 12192 Affordable Custom Cores Modelers Modelers Combat Oeemlint Cores $12 Shon kiss $20 templates no wood Fell kits wood $35 Combat newsletter witb tltortlfull kit S3021 SD7037 Centle Lady Spirit 2M full wing kiss $35 Upgrade glider en intermediate level aew wing Dodger Larsen 25 Qeickee 500 cores $6 per pair Custom pee-sheeted wings available balsa obechi Let us cat ccxl club project Custom core quantity discounts orders add $5 S&l-l COrts add $6 additional RA Cores po nos g63 Sostbbeidge MA 01550 500 765-9990 DISCOVER ELECTRIC RTP FLYING Catalog including Ballards imports $1 SKONK WORKS 1890 Forestdale Ave Beavercreek OH 45432 513 429-2411 Interested Soaring Electric Flight Great So Are Northeast Sailplane Products carry comprehensive line silent flight prod ucts industry sell RIG Sail planes Electrics related accessories reference features hundreds products doz ens informative articles technical infor mation great sport RIO silent flight can meet needs abilities beginner expert dedicated pro viding personal customer service Check out NSP..youll glad did Welcome world NSP first open unique reference will awe number quality products have Also ordering us easy fun because help step way order reference mail $700 $5 plus $2 s&h NSF Well ship reference via express mail arent completely satisfied simply send back prompt courteous refund Northeast Sailplane Products 16 Kirby Lane Williston Vermont 05495 Sailplane Products 1993 RC Soaring Electric Reference Northeast N N Price $5 Northeast SaIlplane Products Irby Lane WIllIston VT 05495 comprehensive reference Radio Control Soaring Electric Flight RC SoaringlBlakeslee Continued paqe 53 other things being right pilot being skilled Whereas acceptable tolerances expressed thousandths inch typical tools techniques materials used bulk builders lucky build hundredths question possible build wing intentionally match set coordinates think could could prove anyway thanks Harley thoughtful comments Most us have intuitive feeling its practically impossible build wing perfect airfoil probably have stopped consider alt ways go wrong personal experience can offer another way Last year friend Kal Kanyo bagged glass-over-white-foam wing supposed have HQ 25/90 airfoil bit too much vacuum kind squeezed little airfoil probably came out about 225/85 still flew fine Ill bet surprised learn Harley isnt overly fond airfoil SD7037 brings up another important aspect flying RC gliders flier needs select sailplane airfoil combination comfortable Some people prefer lighter slower models some like heavier faster newcomer hobby need experiment series kits course can take years normal progression start trainer-type designs lighter/slower-flying gliders designs will use higher-lift airfoils fairly thick higher camber eg 5D7032 have wing loadings around 10 ounces per square foot less After awhile may feel need speed can look some heavier/faster designs use lower-lift airfoils like HQ 20/80 RGl5 thinner less cambered Wing loadings will over 12 ounces per square foot Heavier designs will ordinarily have stronger airframes will capable dealing wider variety flying conditionslike windy weather Harley hinted name game finding setup suits own flying style local conditions find large part enjoyment RC soaring Vintage M&M Secondary Glider Rich Tanis Hawthorne New Jersey sent photos letter describing very interestingScaie project Enclosed photos latest glider project completed time display last weeks WRAM show New York thought readers might enjoy seeing antique plane type M&M Secondary Glider appeared 60 years ago 1930 edition Modem Mechanix magazine full-scale home builders project 1930 could buy plane ready fly $300 developed plans some 22 years ago set aside recently completed plans built model took three months Wingspan 102 inches chord 135 inches body 76 inches long weight six pounds glider has open cockpit seat backrest -scale pilot working joystick seat belt rndder pedals few features some 70 feet cables used rig wings body pull-pull rndder elevator two servos behind pilots seat two wing Covering 21st Century fabric some 100 handmade brass parts project flying wires work needed keep planes tail section body line am also EAA [Experimental Aircraft Association home-builders group BR] member belong Vintage Sailplane Society couple models have appeared VSS Bungee Cord magazine other claim fame organized Old-Timer RC 1969 East Coast Soaring Societys fifthranked sailplane pilot way back 1974 October 1993 55 AFTER YOU DID ALL THE WORK WHY LET YOUR AIRPLANE DO ALL THE FLYING INFO 50O Texas City Remote Control Club Third Annual Big War Bird Fly-In Sept 26 AMA 31032 5 Saicty Inspections MANDATORY Holland Park Texas City Texas Registration Tine 800 AM Registration Fee $1000 include 2 Meal Tickets information call Kimsey Pitts 409 945-5614 L Sponsor byS Debby Ccmtr-Clear Links 921 NASA RDAIRTRONIC IucFutaba Corp Ameilea HOIJSTONIX 77058IP0 BOX 2329 713488-mYSIrvine Ci 92718tov AngdesCA 90051-0329 also US team Soaring 1974 Aerolympics held Lakehurst Naval Air Station New Jersey placing first day 10th overall present time am member past president three sailplane clubs New Jersey Storm King Soaring Team North Jersey Soaring Society Sussex Thermal Snifflers have two great flying sites New York state airport New Jersey Attention Scale FansWe thank Rich sharing Scale project us like Rich interested Scale gliders whether antique modemI want call attention recently formed North American Scale Soaring Association NASSA group American Canadian Scale glider enthusiasts aim share information get together fun-type Scale glider flying includes both slope flatland thermal flying using both winch aerotow launching NASSAs annual dues $10 Send check information write NASSA 3540 Eastlake Drive West Richland WA 99352 Monthly club news provided via special page RIC Soaring Digestwhich should really subscribe anyway because its full kinds good Soaring info RCSD $19 per year Write PO Box 2108 Wylie TX 75098-2108 Tel 214 442-3910 Simple Gliders Quite few letters receive read something like Im retired living fixed income cant afford $500 all-compo site six-servo computer-controlled super sailplanes youre always featuring dont write about simple two- threechannel gliders fun fly inexpensive Believe take letters seriouslyand plead guilty often getting caught up technology race excuse writers viewpoint its great fun able write about sailplanes radios equipment new improved faster better exotic etc guess thats automobile magazines full reports Ferraris Lamborghinis Bentleyscars nobody can afford Rol Klingberg sent sample kit new Thermal Thing has suggested retail price $2995 figured would fun plane fly plus its inexpensive retirees glider ever saw Rols ad copy stresses low cost allout flying fun Thermal Thing cant beat Designed modelers have built least plane first-timers will have little help plane will give money other Two-Meter class glider Continued page 66 56 Model Aviation INE FEVER want new jet model look like jet also FLYLIKEA JET first turbojet engine kit now available diameter approx 110 mm weight approx O0 g thrust approx 30 N proved design F ipi Ing Schreckling ha flown successfully since 1989 sound performance absolutely accordance original -fuel either diesel kerosene suitable - simple individual installation tanks SCHNEIDER-SANCHEZ no noise problems 75 db Am GesmbH runen Weg 5 -8813 St Lambrecht Please contact usforfurther information tria/Europe International patents pendingTelFax 0043/3585/2422 Tel 0043 / 3585 / 2486 BUILD & FLY THE miniMAX YOURSELF 1 1 Fr ~r \O Resenjnd Cham1,,t UltralightPart 103 ultralightEasy Construction -Fun Ply-InWood Construction TEAM n 10790-MA Ivy Bluff Rd Bradyville TN 37026 765-5397 five minutes can upgrade stan dard Futaba Airtronics servos ball bearing servos new EMS Ball Bearing Conversion Kit New case tops accurately molded super tough glass filled fuel-proof Celcon include top quality stainless steel ball bearing servo output shaft * Stops case top andlor plastic bushing wear * Prevents output gear shaft shimmy * Reduces friction improves servo centering * Enhances performance airplanes boats & cars * Mandatory helicopter servos * Free output arm provided case top * Guaranteed against breakage year * Why pay $3995 $2995 IBC-1 Fits FUTABA 528/5128 S38/S138 S48/S148 Servos set 4$2595 rnC2As above set 1$695 '-3Fits AIRTRONICS 94102 Servos set 4$2595 -4 As above set 1 $695 nii5 Ball Bearing Only JR 501 507 RCD APOLLO 05 10 FOCUS HS300 HS500 ACE 330342 342HS TOWER TS-51 Servos set 4$1995 Add $300 Shipping Handling orders ne714 692-1393 Info OnlyCalifornia Residents Add 775% sales Tax 800 845-8978 Orders OnlyVISA MASTERCARD Accepted * * Long Engine Life * * Use BRU LINE Air Cleaner Completely Fuel Proof Nylon Rubber Parts Cat No 102 Air Cleaner Coarse $299 Cat No 202 Air Cleaner Fine $299 Replacement Inserts Cat No 104 Pkl2 Inserts Coarse $239 Cat No 204 Pkl2 Inserts Fine $239 FITS MOST ENGINES 25and UP SEE YOUR LOCAL HOBBY DEALER IF UNAVAILABLE LOCALLY SEND TO Bru Line Industries Inc po Box 3786 Center Line Michigan 48015 lAdd $250 shipping igan residents add 4% sales tax RC SoaringlBlakeslee Continued page 56 Thermal Thing can built either 71- 77-inch wingspan 430square-inch wing area minimum weight 16 ounces Itll take 049 engine want go route Thermal Thing kits should available local hobby shops can order directly Future Flight 1256 Prescott Ave Sunnyvale CA 94089 Rol has limitedtime special mail order price$ 15 plus $5 shipping handling Cant beat Other simple gliders would include just about Two-Meter kits put out trainers Carl Goldberg sells lot Gentle Lady kits because inexpensive fly quite well little money like Airtronics Oly 650 because its excellent kit build its very sturdy bounces better its fine flier Ace Easy Eagle designed Harley Michaelis Great Planes Spirit designed Paul Carlson also nice simple gliders want go larger 100-inchspan model Airtronics Oly II alltime favorite trainer can flown rudder elevator although addition spoilers good idea Great Planes Spirit 100 also seems like smart choice because includes material build either slower S3010 faster S7037 airfoil wing can put ailerons flaps thats getting away simple sailplane premise Simple Electric gliders much different pure trainer-type gliders mentioned above Actually Electrics very good way learn fly gliders just have fun dinking around Six-or seven-cell Electrics have lot going because popularity RC cars motors batteries chargers quite inexpensive can launch Two-Meter-size Electric relatively small area no high-start winch line stretch out really no need run motor longer get plane up higher about 75 100 feet gives practice finding using lower level lift exactly what Joe Wurts recommends doing hand-launch glideronly starting little higher can throw theres no lift just restart motor Depending motor-battery-prop combination could get up 10 throws out charge Also stop think about Electrics perfect slope soaring extra weight usually advantage slope breeze stops just switch motor Think envious flying buddies will trek bottom slope retrieve Continued page 82 66 Model Aviation Yorba Linda C. above statements made Clarence Lee Don Lowe Howard Crisp/n IEEE Tack Support 202-177-1712 TUE LiIAI DEALE HE CALL less coesgieta calalag mud uN-addresud 750 stamped #10 eveIepe 18311 esallted let order HAVE MUIR PROIICTS I 141 MA rd CT WE I71-1MI interested obtaining copy list can write Tomas Mejzlik Jurkovicova 19 63800 Brno Czechol Czechoslovakia can also send SASE Ill send photocopy Till next time. oaringlBlakeslee Continued page 66 gliders Simple Electric kits include Airtronics Eclipse Deluxe Graupner UHU Astro Flight Challenger Davey Systems Lucifer Great Planes Spectra similar Two-Meter Electric kits use six- seven-cell battery packs inexpensive motors lot fun buck New Skimmer Electric sailplane latest addition above list fun Electrics Skimmer Hobby Lobby International HLI rudderelevator-motor control 70-inch-span allwood kit selling $48 Jim Martin HLI very excited about new design says performs like $300 custom Electric sailplane says Skimmer will climb speck height two three times charge power off prop folded Jim guarantees will catch thermals has Selig 3021 airfoil 532-squareinch wing area total weight 44 ounces 12-ounce-per-square-foot wing loading battery compartment bottom under wing dont need take wing off swap batteries Recommended drive system Graupner Speed 600 motor six cells 7 x 3 prop seven cells 8 x 41/2 prop Speed 600 motor folding propeller $33 An on/off motor controller Battery Eliminator Circuit BEC also required Hitec 1003 costs less $30 works fine video available Skimmer $9 get $6 back return Hobby Lobby also has excellentfree 124page catalog order request catalog further information write Hobby Lobby 5614 Franklin Pike Circle Brentwood TN 37027 Tel 615 373-1444 odel Aviation ply Dust. Teat ad 8818 S Metea Muff laP Thinks its pipe itiii Meat Effective Muffler SIG MANUFACTURING CO now imports complete line world record holding ROSSI aircraft marine helicopter race car engines includes full line parts accessories plus full time ROSSI REPAIR CENTER US SIG-imported ROSSI engines come full 90 day SIG WARRANTY against work manship manufacturing defects SIG MANUFACTURING CO INC PH 515-623-5154 FAX 515-623-3922 Montezuma IA 50171 Toll Free Orders 800-247-5008
Edition: Model Aviation - 1993/10
Page Numbers: 52, 53, 55, 56, 66, 82
RADIO CONTROL SOARING MY JUNE 1993 COLUMN piece compared three airfoils 53021 Michael Seligs redesign Eppler 205 SD7037PT Princeton Test airfoil built Harley Michaelis real SD7037 designed Selig Donovan Fritz Bien pointed out Michaelis built SD7O37PT airfoil actually shaped closer S3021 SD7037 Michael Selig agreed Fritz want obtain performance shown Soartech #8 Princeton wind tunnel test data compiled youd better make wing airfoil same Harley built fact nobody knows Michaelis-built SD7O37PT compares real SD7037 Fritzs conclusion airfoil Harley made right approach having great drag polar lOOK Re range main difference between Michaelis airfoil 53021 SD7037 entry angle front top surface shallower 0030 inches out 12-inch chord Fritz went suggest Harley created super-airfoil Maybe should designated SDM7037 honor Harley Since offic4il coordinates available builders need look Airfoil Comparison Plots section back Soartech #8 learn what SDM7037 looks like Anyway Harley read aerodynamic theory June column much interest good humor kind enough sit down write us letter describing whole episode also brings up problems arise try build perfect wing think sailplane builders will find much wonder about Heres Harleys letter think should dispel notion building SD7037 model tested Princeton did some great insight Results matter blind luck rather planning part truth step initial plotting final glassing provided opportunity unintentionally stray original coordinates prepared plots Chuck Andersons Airfoil Plotting Program using nine-pin dot-matrix printer old two- floppy-disk computer specifying 146 inch skin thickness 120-inch chord plot sent paper plots Bob Sealy made templates cut cores Obviously can take no credit cores work Now new 24-pin printer new computer still see minor variations identical plots evidenced laying plywood template weren t variations making templates thickness plot line presents source error airfoil represented outer perimeter plot line inner perimeter middle line Having made guess making templates able cut wavering intended path Really cut down middle assuming cut blade width distorts things thinnest blade makes cut about 020inch wide Thats 010-inch either side represents substantial deviation tolerances over 004-inch significant Michael Selig notes Next cutting core what mischief does hot wire example wrong wire wrong diameter too hot too cold sagging dragging unequal travel speed etc What happening wire briefly hangs up rough spot template smooth flat sanding block skinning use A6-inch sheeting skins some may under dimension some over some thinner edge As sand out irregularities airfoil being distorted Fashioning both leading edge trailing edge present opportunity distort still am unable make female LE template accurately rigid material using modelers tools find cant smoothly cut inside LE radius finest band saw blade end up hacking away jewelers files until template resembles intended contour 52 Model Aviation awley Buena Park CA says Leon Kincaid-designed Heat Seeker f lies super couldnt satisfied Thermal Thing glider Future Flight New Rol Klingberg design good simple glidersee text details 1930 Vintage Secondary Glider built scale Rich Tanis Hawthorne NJ test-glide hill Goffle Brook Park Hawthorne Again judge contour placing over yet another plot suspect accuracy Although friend Harry Smith cuts great cores inevitably LE shaping time discover structure does lend itself being shaped like template Its either too thick too thin times see discrepancies up 1A6-inch can far off So resort eyeball engineering modelers friend TLAR [that looks about rightBR] system building multiple-tapered wing surely have template increment did sanding blocks fiat have no tools accurately shape rounded radius descending dimensions Much said about keeping TE thin since impractical feather zero distortion inevitable Most wings have seen display disproportionate TE thickening represents builders limitation feather out wish some strength making 5D7037 model wind tunnel didnt need concerned about practicality field So extended fiberglass cloth layers together paper-thin surface likely impacted numbers favorabW impractical real world practice always make plot overlengthsay l0/16 inches actual chord 10 inches build wing 10-inch chord about 1/sninch thick TE 0007-inch carbon fiber laminate between 1A6-inch skins clearly TE distortion realistic trade-off bagging glass cloth directly over core TE thinner looks great subject easy chipping others raving about PT 5D7037 [92% thick 302% camber BR] thought should build wing Jouster design [construction article July 1993 MA-BR give airfoil best chance took particular care building wing Compared unheralded S2091 improved Aquila airfoil 101% thick 391% camber 5D7032 995% thick 366% camber impressed ship did get high tow kept boring higher speed handle well far less favorable stall characteristics did stay up well marginal lift seemed cruise faster could advantageous wind came hotter landing conclusion preferred other two airfoils mentioned Did get wing 5D7037 comparable Princeton model would know would builder know Sometimes think popularity airfoil product 1 some skilled flier happens win NATS 2 some prominent kit maker arbitrarily decides use based 1 3 everybody using must good fortunate have fine airfoil choices efforts Michael Selig John Donovan David Fraser builders provided models Princeton tests However talk about airfoils think should remember such things sound basic airframe design well-made wellaligned surfaces proper matching washout correct CG etc plenty practice vital success airfoil unquestioned superiority given application expected results would achieved October 1993 53 Now ou LAUNCH 01117 SOAR AND OUTIT LAND FOR LESS Genesis all-composite precision-molded thermal duration competition model manufactured US today Synergy F3B models highly competitive everything thermal duration slope racing Limited time pricing Genesis $449 Synergy III $599 Synergy 91 $549 SB/XC $749 Available exclusively Slegers International 201 366-0880 RnR Products 1120 Wrigley Way Milpitas CA 95035 408 946-4751 continued page SS GIANT SCALE MODELS CESSNA 150/152 10 SPAN 1/3 SCALE $475 DIASOLO gre SPAN 35% SCALE $285 VARIANT II 87 SPAN SPORT $16995 ulI shoil kits avaIlable acceasorlsa available amlsly Call writs free brochure ahowhg full prices hiciuds alsln Dsalsr Inquirsa Invited CmCEUEL 4302N 750W Ugcnier IN 46767 C219J S94-3370 Skimmer six- seven-cell electric glider Hobby Lobby offers another way launch good-flying thermal model R/C Combat Gremlin RUM 12192 Affordable Custom Cores Modelers Modelers Combat Oeemlint Cores $12 Shon kiss $20 templates no wood Fell kits wood $35 Combat newsletter witb tltortlfull kit S3021 SD7037 Centle Lady Spirit 2M full wing kiss $35 Upgrade glider en intermediate level aew wing Dodger Larsen 25 Qeickee 500 cores $6 per pair Custom pee-sheeted wings available balsa obechi Let us cat ccxl club project Custom core quantity discounts orders add $5 S&l-l COrts add $6 additional RA Cores po nos g63 Sostbbeidge MA 01550 500 765-9990 DISCOVER ELECTRIC RTP FLYING Catalog including Ballards imports $1 SKONK WORKS 1890 Forestdale Ave Beavercreek OH 45432 513 429-2411 Interested Soaring Electric Flight Great So Are Northeast Sailplane Products carry comprehensive line silent flight prod ucts industry sell RIG Sail planes Electrics related accessories reference features hundreds products doz ens informative articles technical infor mation great sport RIO silent flight can meet needs abilities beginner expert dedicated pro viding personal customer service Check out NSP..youll glad did Welcome world NSP first open unique reference will awe number quality products have Also ordering us easy fun because help step way order reference mail $700 $5 plus $2 s&h NSF Well ship reference via express mail arent completely satisfied simply send back prompt courteous refund Northeast Sailplane Products 16 Kirby Lane Williston Vermont 05495 Sailplane Products 1993 RC Soaring Electric Reference Northeast N N Price $5 Northeast SaIlplane Products Irby Lane WIllIston VT 05495 comprehensive reference Radio Control Soaring Electric Flight RC SoaringlBlakeslee Continued paqe 53 other things being right pilot being skilled Whereas acceptable tolerances expressed thousandths inch typical tools techniques materials used bulk builders lucky build hundredths question possible build wing intentionally match set coordinates think could could prove anyway thanks Harley thoughtful comments Most us have intuitive feeling its practically impossible build wing perfect airfoil probably have stopped consider alt ways go wrong personal experience can offer another way Last year friend Kal Kanyo bagged glass-over-white-foam wing supposed have HQ 25/90 airfoil bit too much vacuum kind squeezed little airfoil probably came out about 225/85 still flew fine Ill bet surprised learn Harley isnt overly fond airfoil SD7037 brings up another important aspect flying RC gliders flier needs select sailplane airfoil combination comfortable Some people prefer lighter slower models some like heavier faster newcomer hobby need experiment series kits course can take years normal progression start trainer-type designs lighter/slower-flying gliders designs will use higher-lift airfoils fairly thick higher camber eg 5D7032 have wing loadings around 10 ounces per square foot less After awhile may feel need speed can look some heavier/faster designs use lower-lift airfoils like HQ 20/80 RGl5 thinner less cambered Wing loadings will over 12 ounces per square foot Heavier designs will ordinarily have stronger airframes will capable dealing wider variety flying conditionslike windy weather Harley hinted name game finding setup suits own flying style local conditions find large part enjoyment RC soaring Vintage M&M Secondary Glider Rich Tanis Hawthorne New Jersey sent photos letter describing very interestingScaie project Enclosed photos latest glider project completed time display last weeks WRAM show New York thought readers might enjoy seeing antique plane type M&M Secondary Glider appeared 60 years ago 1930 edition Modem Mechanix magazine full-scale home builders project 1930 could buy plane ready fly $300 developed plans some 22 years ago set aside recently completed plans built model took three months Wingspan 102 inches chord 135 inches body 76 inches long weight six pounds glider has open cockpit seat backrest -scale pilot working joystick seat belt rndder pedals few features some 70 feet cables used rig wings body pull-pull rndder elevator two servos behind pilots seat two wing Covering 21st Century fabric some 100 handmade brass parts project flying wires work needed keep planes tail section body line am also EAA [Experimental Aircraft Association home-builders group BR] member belong Vintage Sailplane Society couple models have appeared VSS Bungee Cord magazine other claim fame organized Old-Timer RC 1969 East Coast Soaring Societys fifthranked sailplane pilot way back 1974 October 1993 55 AFTER YOU DID ALL THE WORK WHY LET YOUR AIRPLANE DO ALL THE FLYING INFO 50O Texas City Remote Control Club Third Annual Big War Bird Fly-In Sept 26 AMA 31032 5 Saicty Inspections MANDATORY Holland Park Texas City Texas Registration Tine 800 AM Registration Fee $1000 include 2 Meal Tickets information call Kimsey Pitts 409 945-5614 L Sponsor byS Debby Ccmtr-Clear Links 921 NASA RDAIRTRONIC IucFutaba Corp Ameilea HOIJSTONIX 77058IP0 BOX 2329 713488-mYSIrvine Ci 92718tov AngdesCA 90051-0329 also US team Soaring 1974 Aerolympics held Lakehurst Naval Air Station New Jersey placing first day 10th overall present time am member past president three sailplane clubs New Jersey Storm King Soaring Team North Jersey Soaring Society Sussex Thermal Snifflers have two great flying sites New York state airport New Jersey Attention Scale FansWe thank Rich sharing Scale project us like Rich interested Scale gliders whether antique modemI want call attention recently formed North American Scale Soaring Association NASSA group American Canadian Scale glider enthusiasts aim share information get together fun-type Scale glider flying includes both slope flatland thermal flying using both winch aerotow launching NASSAs annual dues $10 Send check information write NASSA 3540 Eastlake Drive West Richland WA 99352 Monthly club news provided via special page RIC Soaring Digestwhich should really subscribe anyway because its full kinds good Soaring info RCSD $19 per year Write PO Box 2108 Wylie TX 75098-2108 Tel 214 442-3910 Simple Gliders Quite few letters receive read something like Im retired living fixed income cant afford $500 all-compo site six-servo computer-controlled super sailplanes youre always featuring dont write about simple two- threechannel gliders fun fly inexpensive Believe take letters seriouslyand plead guilty often getting caught up technology race excuse writers viewpoint its great fun able write about sailplanes radios equipment new improved faster better exotic etc guess thats automobile magazines full reports Ferraris Lamborghinis Bentleyscars nobody can afford Rol Klingberg sent sample kit new Thermal Thing has suggested retail price $2995 figured would fun plane fly plus its inexpensive retirees glider ever saw Rols ad copy stresses low cost allout flying fun Thermal Thing cant beat Designed modelers have built least plane first-timers will have little help plane will give money other Two-Meter class glider Continued page 66 56 Model Aviation INE FEVER want new jet model look like jet also FLYLIKEA JET first turbojet engine kit now available diameter approx 110 mm weight approx O0 g thrust approx 30 N proved design F ipi Ing Schreckling ha flown successfully since 1989 sound performance absolutely accordance original -fuel either diesel kerosene suitable - simple individual installation tanks SCHNEIDER-SANCHEZ no noise problems 75 db Am GesmbH runen Weg 5 -8813 St Lambrecht Please contact usforfurther information tria/Europe International patents pendingTelFax 0043/3585/2422 Tel 0043 / 3585 / 2486 BUILD & FLY THE miniMAX YOURSELF 1 1 Fr ~r \O Resenjnd Cham1,,t UltralightPart 103 ultralightEasy Construction -Fun Ply-InWood Construction TEAM n 10790-MA Ivy Bluff Rd Bradyville TN 37026 765-5397 five minutes can upgrade stan dard Futaba Airtronics servos ball bearing servos new EMS Ball Bearing Conversion Kit New case tops accurately molded super tough glass filled fuel-proof Celcon include top quality stainless steel ball bearing servo output shaft * Stops case top andlor plastic bushing wear * Prevents output gear shaft shimmy * Reduces friction improves servo centering * Enhances performance airplanes boats & cars * Mandatory helicopter servos * Free output arm provided case top * Guaranteed against breakage year * Why pay $3995 $2995 IBC-1 Fits FUTABA 528/5128 S38/S138 S48/S148 Servos set 4$2595 rnC2As above set 1$695 '-3Fits AIRTRONICS 94102 Servos set 4$2595 -4 As above set 1 $695 nii5 Ball Bearing Only JR 501 507 RCD APOLLO 05 10 FOCUS HS300 HS500 ACE 330342 342HS TOWER TS-51 Servos set 4$1995 Add $300 Shipping Handling orders ne714 692-1393 Info OnlyCalifornia Residents Add 775% sales Tax 800 845-8978 Orders OnlyVISA MASTERCARD Accepted * * Long Engine Life * * Use BRU LINE Air Cleaner Completely Fuel Proof Nylon Rubber Parts Cat No 102 Air Cleaner Coarse $299 Cat No 202 Air Cleaner Fine $299 Replacement Inserts Cat No 104 Pkl2 Inserts Coarse $239 Cat No 204 Pkl2 Inserts Fine $239 FITS MOST ENGINES 25and UP SEE YOUR LOCAL HOBBY DEALER IF UNAVAILABLE LOCALLY SEND TO Bru Line Industries Inc po Box 3786 Center Line Michigan 48015 lAdd $250 shipping igan residents add 4% sales tax RC SoaringlBlakeslee Continued page 56 Thermal Thing can built either 71- 77-inch wingspan 430square-inch wing area minimum weight 16 ounces Itll take 049 engine want go route Thermal Thing kits should available local hobby shops can order directly Future Flight 1256 Prescott Ave Sunnyvale CA 94089 Rol has limitedtime special mail order price$ 15 plus $5 shipping handling Cant beat Other simple gliders would include just about Two-Meter kits put out trainers Carl Goldberg sells lot Gentle Lady kits because inexpensive fly quite well little money like Airtronics Oly 650 because its excellent kit build its very sturdy bounces better its fine flier Ace Easy Eagle designed Harley Michaelis Great Planes Spirit designed Paul Carlson also nice simple gliders want go larger 100-inchspan model Airtronics Oly II alltime favorite trainer can flown rudder elevator although addition spoilers good idea Great Planes Spirit 100 also seems like smart choice because includes material build either slower S3010 faster S7037 airfoil wing can put ailerons flaps thats getting away simple sailplane premise Simple Electric gliders much different pure trainer-type gliders mentioned above Actually Electrics very good way learn fly gliders just have fun dinking around Six-or seven-cell Electrics have lot going because popularity RC cars motors batteries chargers quite inexpensive can launch Two-Meter-size Electric relatively small area no high-start winch line stretch out really no need run motor longer get plane up higher about 75 100 feet gives practice finding using lower level lift exactly what Joe Wurts recommends doing hand-launch glideronly starting little higher can throw theres no lift just restart motor Depending motor-battery-prop combination could get up 10 throws out charge Also stop think about Electrics perfect slope soaring extra weight usually advantage slope breeze stops just switch motor Think envious flying buddies will trek bottom slope retrieve Continued page 82 66 Model Aviation Yorba Linda C. above statements made Clarence Lee Don Lowe Howard Crisp/n IEEE Tack Support 202-177-1712 TUE LiIAI DEALE HE CALL less coesgieta calalag mud uN-addresud 750 stamped #10 eveIepe 18311 esallted let order HAVE MUIR PROIICTS I 141 MA rd CT WE I71-1MI interested obtaining copy list can write Tomas Mejzlik Jurkovicova 19 63800 Brno Czechol Czechoslovakia can also send SASE Ill send photocopy Till next time. oaringlBlakeslee Continued page 66 gliders Simple Electric kits include Airtronics Eclipse Deluxe Graupner UHU Astro Flight Challenger Davey Systems Lucifer Great Planes Spectra similar Two-Meter Electric kits use six- seven-cell battery packs inexpensive motors lot fun buck New Skimmer Electric sailplane latest addition above list fun Electrics Skimmer Hobby Lobby International HLI rudderelevator-motor control 70-inch-span allwood kit selling $48 Jim Martin HLI very excited about new design says performs like $300 custom Electric sailplane says Skimmer will climb speck height two three times charge power off prop folded Jim guarantees will catch thermals has Selig 3021 airfoil 532-squareinch wing area total weight 44 ounces 12-ounce-per-square-foot wing loading battery compartment bottom under wing dont need take wing off swap batteries Recommended drive system Graupner Speed 600 motor six cells 7 x 3 prop seven cells 8 x 41/2 prop Speed 600 motor folding propeller $33 An on/off motor controller Battery Eliminator Circuit BEC also required Hitec 1003 costs less $30 works fine video available Skimmer $9 get $6 back return Hobby Lobby also has excellentfree 124page catalog order request catalog further information write Hobby Lobby 5614 Franklin Pike Circle Brentwood TN 37027 Tel 615 373-1444 odel Aviation ply Dust. Teat ad 8818 S Metea Muff laP Thinks its pipe itiii Meat Effective Muffler SIG MANUFACTURING CO now imports complete line world record holding ROSSI aircraft marine helicopter race car engines includes full line parts accessories plus full time ROSSI REPAIR CENTER US SIG-imported ROSSI engines come full 90 day SIG WARRANTY against work manship manufacturing defects SIG MANUFACTURING CO INC PH 515-623-5154 FAX 515-623-3922 Montezuma IA 50171 Toll Free Orders 800-247-5008
Edition: Model Aviation - 1993/10
Page Numbers: 52, 53, 55, 56, 66, 82
RADIO CONTROL SOARING MY JUNE 1993 COLUMN piece compared three airfoils 53021 Michael Seligs redesign Eppler 205 SD7037PT Princeton Test airfoil built Harley Michaelis real SD7037 designed Selig Donovan Fritz Bien pointed out Michaelis built SD7O37PT airfoil actually shaped closer S3021 SD7037 Michael Selig agreed Fritz want obtain performance shown Soartech #8 Princeton wind tunnel test data compiled youd better make wing airfoil same Harley built fact nobody knows Michaelis-built SD7O37PT compares real SD7037 Fritzs conclusion airfoil Harley made right approach having great drag polar lOOK Re range main difference between Michaelis airfoil 53021 SD7037 entry angle front top surface shallower 0030 inches out 12-inch chord Fritz went suggest Harley created super-airfoil Maybe should designated SDM7037 honor Harley Since offic4il coordinates available builders need look Airfoil Comparison Plots section back Soartech #8 learn what SDM7037 looks like Anyway Harley read aerodynamic theory June column much interest good humor kind enough sit down write us letter describing whole episode also brings up problems arise try build perfect wing think sailplane builders will find much wonder about Heres Harleys letter think should dispel notion building SD7037 model tested Princeton did some great insight Results matter blind luck rather planning part truth step initial plotting final glassing provided opportunity unintentionally stray original coordinates prepared plots Chuck Andersons Airfoil Plotting Program using nine-pin dot-matrix printer old two- floppy-disk computer specifying 146 inch skin thickness 120-inch chord plot sent paper plots Bob Sealy made templates cut cores Obviously can take no credit cores work Now new 24-pin printer new computer still see minor variations identical plots evidenced laying plywood template weren t variations making templates thickness plot line presents source error airfoil represented outer perimeter plot line inner perimeter middle line Having made guess making templates able cut wavering intended path Really cut down middle assuming cut blade width distorts things thinnest blade makes cut about 020inch wide Thats 010-inch either side represents substantial deviation tolerances over 004-inch significant Michael Selig notes Next cutting core what mischief does hot wire example wrong wire wrong diameter too hot too cold sagging dragging unequal travel speed etc What happening wire briefly hangs up rough spot template smooth flat sanding block skinning use A6-inch sheeting skins some may under dimension some over some thinner edge As sand out irregularities airfoil being distorted Fashioning both leading edge trailing edge present opportunity distort still am unable make female LE template accurately rigid material using modelers tools find cant smoothly cut inside LE radius finest band saw blade end up hacking away jewelers files until template resembles intended contour 52 Model Aviation awley Buena Park CA says Leon Kincaid-designed Heat Seeker f lies super couldnt satisfied Thermal Thing glider Future Flight New Rol Klingberg design good simple glidersee text details 1930 Vintage Secondary Glider built scale Rich Tanis Hawthorne NJ test-glide hill Goffle Brook Park Hawthorne Again judge contour placing over yet another plot suspect accuracy Although friend Harry Smith cuts great cores inevitably LE shaping time discover structure does lend itself being shaped like template Its either too thick too thin times see discrepancies up 1A6-inch can far off So resort eyeball engineering modelers friend TLAR [that looks about rightBR] system building multiple-tapered wing surely have template increment did sanding blocks fiat have no tools accurately shape rounded radius descending dimensions Much said about keeping TE thin since impractical feather zero distortion inevitable Most wings have seen display disproportionate TE thickening represents builders limitation feather out wish some strength making 5D7037 model wind tunnel didnt need concerned about practicality field So extended fiberglass cloth layers together paper-thin surface likely impacted numbers favorabW impractical real world practice always make plot overlengthsay l0/16 inches actual chord 10 inches build wing 10-inch chord about 1/sninch thick TE 0007-inch carbon fiber laminate between 1A6-inch skins clearly TE distortion realistic trade-off bagging glass cloth directly over core TE thinner looks great subject easy chipping others raving about PT 5D7037 [92% thick 302% camber BR] thought should build wing Jouster design [construction article July 1993 MA-BR give airfoil best chance took particular care building wing Compared unheralded S2091 improved Aquila airfoil 101% thick 391% camber 5D7032 995% thick 366% camber impressed ship did get high tow kept boring higher speed handle well far less favorable stall characteristics did stay up well marginal lift seemed cruise faster could advantageous wind came hotter landing conclusion preferred other two airfoils mentioned Did get wing 5D7037 comparable Princeton model would know would builder know Sometimes think popularity airfoil product 1 some skilled flier happens win NATS 2 some prominent kit maker arbitrarily decides use based 1 3 everybody using must good fortunate have fine airfoil choices efforts Michael Selig John Donovan David Fraser builders provided models Princeton tests However talk about airfoils think should remember such things sound basic airframe design well-made wellaligned surfaces proper matching washout correct CG etc plenty practice vital success airfoil unquestioned superiority given application expected results would achieved October 1993 53 Now ou LAUNCH 01117 SOAR AND OUTIT LAND FOR LESS Genesis all-composite precision-molded thermal duration competition model manufactured US today Synergy F3B models highly competitive everything thermal duration slope racing Limited time pricing Genesis $449 Synergy III $599 Synergy 91 $549 SB/XC $749 Available exclusively Slegers International 201 366-0880 RnR Products 1120 Wrigley Way Milpitas CA 95035 408 946-4751 continued page SS GIANT SCALE MODELS CESSNA 150/152 10 SPAN 1/3 SCALE $475 DIASOLO gre SPAN 35% SCALE $285 VARIANT II 87 SPAN SPORT $16995 ulI shoil kits avaIlable acceasorlsa available amlsly Call writs free brochure ahowhg full prices hiciuds alsln Dsalsr Inquirsa Invited CmCEUEL 4302N 750W Ugcnier IN 46767 C219J S94-3370 Skimmer six- seven-cell electric glider Hobby Lobby offers another way launch good-flying thermal model R/C Combat Gremlin RUM 12192 Affordable Custom Cores Modelers Modelers Combat Oeemlint Cores $12 Shon kiss $20 templates no wood Fell kits wood $35 Combat newsletter witb tltortlfull kit S3021 SD7037 Centle Lady Spirit 2M full wing kiss $35 Upgrade glider en intermediate level aew wing Dodger Larsen 25 Qeickee 500 cores $6 per pair Custom pee-sheeted wings available balsa obechi Let us cat ccxl club project Custom core quantity discounts orders add $5 S&l-l COrts add $6 additional RA Cores po nos g63 Sostbbeidge MA 01550 500 765-9990 DISCOVER ELECTRIC RTP FLYING Catalog including Ballards imports $1 SKONK WORKS 1890 Forestdale Ave Beavercreek OH 45432 513 429-2411 Interested Soaring Electric Flight Great So Are Northeast Sailplane Products carry comprehensive line silent flight prod ucts industry sell RIG Sail planes Electrics related accessories reference features hundreds products doz ens informative articles technical infor mation great sport RIO silent flight can meet needs abilities beginner expert dedicated pro viding personal customer service Check out NSP..youll glad did Welcome world NSP first open unique reference will awe number quality products have Also ordering us easy fun because help step way order reference mail $700 $5 plus $2 s&h NSF Well ship reference via express mail arent completely satisfied simply send back prompt courteous refund Northeast Sailplane Products 16 Kirby Lane Williston Vermont 05495 Sailplane Products 1993 RC Soaring Electric Reference Northeast N N Price $5 Northeast SaIlplane Products Irby Lane WIllIston VT 05495 comprehensive reference Radio Control Soaring Electric Flight RC SoaringlBlakeslee Continued paqe 53 other things being right pilot being skilled Whereas acceptable tolerances expressed thousandths inch typical tools techniques materials used bulk builders lucky build hundredths question possible build wing intentionally match set coordinates think could could prove anyway thanks Harley thoughtful comments Most us have intuitive feeling its practically impossible build wing perfect airfoil probably have stopped consider alt ways go wrong personal experience can offer another way Last year friend Kal Kanyo bagged glass-over-white-foam wing supposed have HQ 25/90 airfoil bit too much vacuum kind squeezed little airfoil probably came out about 225/85 still flew fine Ill bet surprised learn Harley isnt overly fond airfoil SD7037 brings up another important aspect flying RC gliders flier needs select sailplane airfoil combination comfortable Some people prefer lighter slower models some like heavier faster newcomer hobby need experiment series kits course can take years normal progression start trainer-type designs lighter/slower-flying gliders designs will use higher-lift airfoils fairly thick higher camber eg 5D7032 have wing loadings around 10 ounces per square foot less After awhile may feel need speed can look some heavier/faster designs use lower-lift airfoils like HQ 20/80 RGl5 thinner less cambered Wing loadings will over 12 ounces per square foot Heavier designs will ordinarily have stronger airframes will capable dealing wider variety flying conditionslike windy weather Harley hinted name game finding setup suits own flying style local conditions find large part enjoyment RC soaring Vintage M&M Secondary Glider Rich Tanis Hawthorne New Jersey sent photos letter describing very interestingScaie project Enclosed photos latest glider project completed time display last weeks WRAM show New York thought readers might enjoy seeing antique plane type M&M Secondary Glider appeared 60 years ago 1930 edition Modem Mechanix magazine full-scale home builders project 1930 could buy plane ready fly $300 developed plans some 22 years ago set aside recently completed plans built model took three months Wingspan 102 inches chord 135 inches body 76 inches long weight six pounds glider has open cockpit seat backrest -scale pilot working joystick seat belt rndder pedals few features some 70 feet cables used rig wings body pull-pull rndder elevator two servos behind pilots seat two wing Covering 21st Century fabric some 100 handmade brass parts project flying wires work needed keep planes tail section body line am also EAA [Experimental Aircraft Association home-builders group BR] member belong Vintage Sailplane Society couple models have appeared VSS Bungee Cord magazine other claim fame organized Old-Timer RC 1969 East Coast Soaring Societys fifthranked sailplane pilot way back 1974 October 1993 55 AFTER YOU DID ALL THE WORK WHY LET YOUR AIRPLANE DO ALL THE FLYING INFO 50O Texas City Remote Control Club Third Annual Big War Bird Fly-In Sept 26 AMA 31032 5 Saicty Inspections MANDATORY Holland Park Texas City Texas Registration Tine 800 AM Registration Fee $1000 include 2 Meal Tickets information call Kimsey Pitts 409 945-5614 L Sponsor byS Debby Ccmtr-Clear Links 921 NASA RDAIRTRONIC IucFutaba Corp Ameilea HOIJSTONIX 77058IP0 BOX 2329 713488-mYSIrvine Ci 92718tov AngdesCA 90051-0329 also US team Soaring 1974 Aerolympics held Lakehurst Naval Air Station New Jersey placing first day 10th overall present time am member past president three sailplane clubs New Jersey Storm King Soaring Team North Jersey Soaring Society Sussex Thermal Snifflers have two great flying sites New York state airport New Jersey Attention Scale FansWe thank Rich sharing Scale project us like Rich interested Scale gliders whether antique modemI want call attention recently formed North American Scale Soaring Association NASSA group American Canadian Scale glider enthusiasts aim share information get together fun-type Scale glider flying includes both slope flatland thermal flying using both winch aerotow launching NASSAs annual dues $10 Send check information write NASSA 3540 Eastlake Drive West Richland WA 99352 Monthly club news provided via special page RIC Soaring Digestwhich should really subscribe anyway because its full kinds good Soaring info RCSD $19 per year Write PO Box 2108 Wylie TX 75098-2108 Tel 214 442-3910 Simple Gliders Quite few letters receive read something like Im retired living fixed income cant afford $500 all-compo site six-servo computer-controlled super sailplanes youre always featuring dont write about simple two- threechannel gliders fun fly inexpensive Believe take letters seriouslyand plead guilty often getting caught up technology race excuse writers viewpoint its great fun able write about sailplanes radios equipment new improved faster better exotic etc guess thats automobile magazines full reports Ferraris Lamborghinis Bentleyscars nobody can afford Rol Klingberg sent sample kit new Thermal Thing has suggested retail price $2995 figured would fun plane fly plus its inexpensive retirees glider ever saw Rols ad copy stresses low cost allout flying fun Thermal Thing cant beat Designed modelers have built least plane first-timers will have little help plane will give money other Two-Meter class glider Continued page 66 56 Model Aviation INE FEVER want new jet model look like jet also FLYLIKEA JET first turbojet engine kit now available diameter approx 110 mm weight approx O0 g thrust approx 30 N proved design F ipi Ing Schreckling ha flown successfully since 1989 sound performance absolutely accordance original -fuel either diesel kerosene suitable - simple individual installation tanks SCHNEIDER-SANCHEZ no noise problems 75 db Am GesmbH runen Weg 5 -8813 St Lambrecht Please contact usforfurther information tria/Europe International patents pendingTelFax 0043/3585/2422 Tel 0043 / 3585 / 2486 BUILD & FLY THE miniMAX YOURSELF 1 1 Fr ~r \O Resenjnd Cham1,,t UltralightPart 103 ultralightEasy Construction -Fun Ply-InWood Construction TEAM n 10790-MA Ivy Bluff Rd Bradyville TN 37026 765-5397 five minutes can upgrade stan dard Futaba Airtronics servos ball bearing servos new EMS Ball Bearing Conversion Kit New case tops accurately molded super tough glass filled fuel-proof Celcon include top quality stainless steel ball bearing servo output shaft * Stops case top andlor plastic bushing wear * Prevents output gear shaft shimmy * Reduces friction improves servo centering * Enhances performance airplanes boats & cars * Mandatory helicopter servos * Free output arm provided case top * Guaranteed against breakage year * Why pay $3995 $2995 IBC-1 Fits FUTABA 528/5128 S38/S138 S48/S148 Servos set 4$2595 rnC2As above set 1$695 '-3Fits AIRTRONICS 94102 Servos set 4$2595 -4 As above set 1 $695 nii5 Ball Bearing Only JR 501 507 RCD APOLLO 05 10 FOCUS HS300 HS500 ACE 330342 342HS TOWER TS-51 Servos set 4$1995 Add $300 Shipping Handling orders ne714 692-1393 Info OnlyCalifornia Residents Add 775% sales Tax 800 845-8978 Orders OnlyVISA MASTERCARD Accepted * * Long Engine Life * * Use BRU LINE Air Cleaner Completely Fuel Proof Nylon Rubber Parts Cat No 102 Air Cleaner Coarse $299 Cat No 202 Air Cleaner Fine $299 Replacement Inserts Cat No 104 Pkl2 Inserts Coarse $239 Cat No 204 Pkl2 Inserts Fine $239 FITS MOST ENGINES 25and UP SEE YOUR LOCAL HOBBY DEALER IF UNAVAILABLE LOCALLY SEND TO Bru Line Industries Inc po Box 3786 Center Line Michigan 48015 lAdd $250 shipping igan residents add 4% sales tax RC SoaringlBlakeslee Continued page 56 Thermal Thing can built either 71- 77-inch wingspan 430square-inch wing area minimum weight 16 ounces Itll take 049 engine want go route Thermal Thing kits should available local hobby shops can order directly Future Flight 1256 Prescott Ave Sunnyvale CA 94089 Rol has limitedtime special mail order price$ 15 plus $5 shipping handling Cant beat Other simple gliders would include just about Two-Meter kits put out trainers Carl Goldberg sells lot Gentle Lady kits because inexpensive fly quite well little money like Airtronics Oly 650 because its excellent kit build its very sturdy bounces better its fine flier Ace Easy Eagle designed Harley Michaelis Great Planes Spirit designed Paul Carlson also nice simple gliders want go larger 100-inchspan model Airtronics Oly II alltime favorite trainer can flown rudder elevator although addition spoilers good idea Great Planes Spirit 100 also seems like smart choice because includes material build either slower S3010 faster S7037 airfoil wing can put ailerons flaps thats getting away simple sailplane premise Simple Electric gliders much different pure trainer-type gliders mentioned above Actually Electrics very good way learn fly gliders just have fun dinking around Six-or seven-cell Electrics have lot going because popularity RC cars motors batteries chargers quite inexpensive can launch Two-Meter-size Electric relatively small area no high-start winch line stretch out really no need run motor longer get plane up higher about 75 100 feet gives practice finding using lower level lift exactly what Joe Wurts recommends doing hand-launch glideronly starting little higher can throw theres no lift just restart motor Depending motor-battery-prop combination could get up 10 throws out charge Also stop think about Electrics perfect slope soaring extra weight usually advantage slope breeze stops just switch motor Think envious flying buddies will trek bottom slope retrieve Continued page 82 66 Model Aviation Yorba Linda C. above statements made Clarence Lee Don Lowe Howard Crisp/n IEEE Tack Support 202-177-1712 TUE LiIAI DEALE HE CALL less coesgieta calalag mud uN-addresud 750 stamped #10 eveIepe 18311 esallted let order HAVE MUIR PROIICTS I 141 MA rd CT WE I71-1MI interested obtaining copy list can write Tomas Mejzlik Jurkovicova 19 63800 Brno Czechol Czechoslovakia can also send SASE Ill send photocopy Till next time. oaringlBlakeslee Continued page 66 gliders Simple Electric kits include Airtronics Eclipse Deluxe Graupner UHU Astro Flight Challenger Davey Systems Lucifer Great Planes Spectra similar Two-Meter Electric kits use six- seven-cell battery packs inexpensive motors lot fun buck New Skimmer Electric sailplane latest addition above list fun Electrics Skimmer Hobby Lobby International HLI rudderelevator-motor control 70-inch-span allwood kit selling $48 Jim Martin HLI very excited about new design says performs like $300 custom Electric sailplane says Skimmer will climb speck height two three times charge power off prop folded Jim guarantees will catch thermals has Selig 3021 airfoil 532-squareinch wing area total weight 44 ounces 12-ounce-per-square-foot wing loading battery compartment bottom under wing dont need take wing off swap batteries Recommended drive system Graupner Speed 600 motor six cells 7 x 3 prop seven cells 8 x 41/2 prop Speed 600 motor folding propeller $33 An on/off motor controller Battery Eliminator Circuit BEC also required Hitec 1003 costs less $30 works fine video available Skimmer $9 get $6 back return Hobby Lobby also has excellentfree 124page catalog order request catalog further information write Hobby Lobby 5614 Franklin Pike Circle Brentwood TN 37027 Tel 615 373-1444 odel Aviation ply Dust. Teat ad 8818 S Metea Muff laP Thinks its pipe itiii Meat Effective Muffler SIG MANUFACTURING CO now imports complete line world record holding ROSSI aircraft marine helicopter race car engines includes full line parts accessories plus full time ROSSI REPAIR CENTER US SIG-imported ROSSI engines come full 90 day SIG WARRANTY against work manship manufacturing defects SIG MANUFACTURING CO INC PH 515-623-5154 FAX 515-623-3922 Montezuma IA 50171 Toll Free Orders 800-247-5008
Edition: Model Aviation - 1993/10
Page Numbers: 52, 53, 55, 56, 66, 82
RADIO CONTROL SOARING MY JUNE 1993 COLUMN piece compared three airfoils 53021 Michael Seligs redesign Eppler 205 SD7037PT Princeton Test airfoil built Harley Michaelis real SD7037 designed Selig Donovan Fritz Bien pointed out Michaelis built SD7O37PT airfoil actually shaped closer S3021 SD7037 Michael Selig agreed Fritz want obtain performance shown Soartech #8 Princeton wind tunnel test data compiled youd better make wing airfoil same Harley built fact nobody knows Michaelis-built SD7O37PT compares real SD7037 Fritzs conclusion airfoil Harley made right approach having great drag polar lOOK Re range main difference between Michaelis airfoil 53021 SD7037 entry angle front top surface shallower 0030 inches out 12-inch chord Fritz went suggest Harley created super-airfoil Maybe should designated SDM7037 honor Harley Since offic4il coordinates available builders need look Airfoil Comparison Plots section back Soartech #8 learn what SDM7037 looks like Anyway Harley read aerodynamic theory June column much interest good humor kind enough sit down write us letter describing whole episode also brings up problems arise try build perfect wing think sailplane builders will find much wonder about Heres Harleys letter think should dispel notion building SD7037 model tested Princeton did some great insight Results matter blind luck rather planning part truth step initial plotting final glassing provided opportunity unintentionally stray original coordinates prepared plots Chuck Andersons Airfoil Plotting Program using nine-pin dot-matrix printer old two- floppy-disk computer specifying 146 inch skin thickness 120-inch chord plot sent paper plots Bob Sealy made templates cut cores Obviously can take no credit cores work Now new 24-pin printer new computer still see minor variations identical plots evidenced laying plywood template weren t variations making templates thickness plot line presents source error airfoil represented outer perimeter plot line inner perimeter middle line Having made guess making templates able cut wavering intended path Really cut down middle assuming cut blade width distorts things thinnest blade makes cut about 020inch wide Thats 010-inch either side represents substantial deviation tolerances over 004-inch significant Michael Selig notes Next cutting core what mischief does hot wire example wrong wire wrong diameter too hot too cold sagging dragging unequal travel speed etc What happening wire briefly hangs up rough spot template smooth flat sanding block skinning use A6-inch sheeting skins some may under dimension some over some thinner edge As sand out irregularities airfoil being distorted Fashioning both leading edge trailing edge present opportunity distort still am unable make female LE template accurately rigid material using modelers tools find cant smoothly cut inside LE radius finest band saw blade end up hacking away jewelers files until template resembles intended contour 52 Model Aviation awley Buena Park CA says Leon Kincaid-designed Heat Seeker f lies super couldnt satisfied Thermal Thing glider Future Flight New Rol Klingberg design good simple glidersee text details 1930 Vintage Secondary Glider built scale Rich Tanis Hawthorne NJ test-glide hill Goffle Brook Park Hawthorne Again judge contour placing over yet another plot suspect accuracy Although friend Harry Smith cuts great cores inevitably LE shaping time discover structure does lend itself being shaped like template Its either too thick too thin times see discrepancies up 1A6-inch can far off So resort eyeball engineering modelers friend TLAR [that looks about rightBR] system building multiple-tapered wing surely have template increment did sanding blocks fiat have no tools accurately shape rounded radius descending dimensions Much said about keeping TE thin since impractical feather zero distortion inevitable Most wings have seen display disproportionate TE thickening represents builders limitation feather out wish some strength making 5D7037 model wind tunnel didnt need concerned about practicality field So extended fiberglass cloth layers together paper-thin surface likely impacted numbers favorabW impractical real world practice always make plot overlengthsay l0/16 inches actual chord 10 inches build wing 10-inch chord about 1/sninch thick TE 0007-inch carbon fiber laminate between 1A6-inch skins clearly TE distortion realistic trade-off bagging glass cloth directly over core TE thinner looks great subject easy chipping others raving about PT 5D7037 [92% thick 302% camber BR] thought should build wing Jouster design [construction article July 1993 MA-BR give airfoil best chance took particular care building wing Compared unheralded S2091 improved Aquila airfoil 101% thick 391% camber 5D7032 995% thick 366% camber impressed ship did get high tow kept boring higher speed handle well far less favorable stall characteristics did stay up well marginal lift seemed cruise faster could advantageous wind came hotter landing conclusion preferred other two airfoils mentioned Did get wing 5D7037 comparable Princeton model would know would builder know Sometimes think popularity airfoil product 1 some skilled flier happens win NATS 2 some prominent kit maker arbitrarily decides use based 1 3 everybody using must good fortunate have fine airfoil choices efforts Michael Selig John Donovan David Fraser builders provided models Princeton tests However talk about airfoils think should remember such things sound basic airframe design well-made wellaligned surfaces proper matching washout correct CG etc plenty practice vital success airfoil unquestioned superiority given application expected results would achieved October 1993 53 Now ou LAUNCH 01117 SOAR AND OUTIT LAND FOR LESS Genesis all-composite precision-molded thermal duration competition model manufactured US today Synergy F3B models highly competitive everything thermal duration slope racing Limited time pricing Genesis $449 Synergy III $599 Synergy 91 $549 SB/XC $749 Available exclusively Slegers International 201 366-0880 RnR Products 1120 Wrigley Way Milpitas CA 95035 408 946-4751 continued page SS GIANT SCALE MODELS CESSNA 150/152 10 SPAN 1/3 SCALE $475 DIASOLO gre SPAN 35% SCALE $285 VARIANT II 87 SPAN SPORT $16995 ulI shoil kits avaIlable acceasorlsa available amlsly Call writs free brochure ahowhg full prices hiciuds alsln Dsalsr Inquirsa Invited CmCEUEL 4302N 750W Ugcnier IN 46767 C219J S94-3370 Skimmer six- seven-cell electric glider Hobby Lobby offers another way launch good-flying thermal model R/C Combat Gremlin RUM 12192 Affordable Custom Cores Modelers Modelers Combat Oeemlint Cores $12 Shon kiss $20 templates no wood Fell kits wood $35 Combat newsletter witb tltortlfull kit S3021 SD7037 Centle Lady Spirit 2M full wing kiss $35 Upgrade glider en intermediate level aew wing Dodger Larsen 25 Qeickee 500 cores $6 per pair Custom pee-sheeted wings available balsa obechi Let us cat ccxl club project Custom core quantity discounts orders add $5 S&l-l COrts add $6 additional RA Cores po nos g63 Sostbbeidge MA 01550 500 765-9990 DISCOVER ELECTRIC RTP FLYING Catalog including Ballards imports $1 SKONK WORKS 1890 Forestdale Ave Beavercreek OH 45432 513 429-2411 Interested Soaring Electric Flight Great So Are Northeast Sailplane Products carry comprehensive line silent flight prod ucts industry sell RIG Sail planes Electrics related accessories reference features hundreds products doz ens informative articles technical infor mation great sport RIO silent flight can meet needs abilities beginner expert dedicated pro viding personal customer service Check out NSP..youll glad did Welcome world NSP first open unique reference will awe number quality products have Also ordering us easy fun because help step way order reference mail $700 $5 plus $2 s&h NSF Well ship reference via express mail arent completely satisfied simply send back prompt courteous refund Northeast Sailplane Products 16 Kirby Lane Williston Vermont 05495 Sailplane Products 1993 RC Soaring Electric Reference Northeast N N Price $5 Northeast SaIlplane Products Irby Lane WIllIston VT 05495 comprehensive reference Radio Control Soaring Electric Flight RC SoaringlBlakeslee Continued paqe 53 other things being right pilot being skilled Whereas acceptable tolerances expressed thousandths inch typical tools techniques materials used bulk builders lucky build hundredths question possible build wing intentionally match set coordinates think could could prove anyway thanks Harley thoughtful comments Most us have intuitive feeling its practically impossible build wing perfect airfoil probably have stopped consider alt ways go wrong personal experience can offer another way Last year friend Kal Kanyo bagged glass-over-white-foam wing supposed have HQ 25/90 airfoil bit too much vacuum kind squeezed little airfoil probably came out about 225/85 still flew fine Ill bet surprised learn Harley isnt overly fond airfoil SD7037 brings up another important aspect flying RC gliders flier needs select sailplane airfoil combination comfortable Some people prefer lighter slower models some like heavier faster newcomer hobby need experiment series kits course can take years normal progression start trainer-type designs lighter/slower-flying gliders designs will use higher-lift airfoils fairly thick higher camber eg 5D7032 have wing loadings around 10 ounces per square foot less After awhile may feel need speed can look some heavier/faster designs use lower-lift airfoils like HQ 20/80 RGl5 thinner less cambered Wing loadings will over 12 ounces per square foot Heavier designs will ordinarily have stronger airframes will capable dealing wider variety flying conditionslike windy weather Harley hinted name game finding setup suits own flying style local conditions find large part enjoyment RC soaring Vintage M&M Secondary Glider Rich Tanis Hawthorne New Jersey sent photos letter describing very interestingScaie project Enclosed photos latest glider project completed time display last weeks WRAM show New York thought readers might enjoy seeing antique plane type M&M Secondary Glider appeared 60 years ago 1930 edition Modem Mechanix magazine full-scale home builders project 1930 could buy plane ready fly $300 developed plans some 22 years ago set aside recently completed plans built model took three months Wingspan 102 inches chord 135 inches body 76 inches long weight six pounds glider has open cockpit seat backrest -scale pilot working joystick seat belt rndder pedals few features some 70 feet cables used rig wings body pull-pull rndder elevator two servos behind pilots seat two wing Covering 21st Century fabric some 100 handmade brass parts project flying wires work needed keep planes tail section body line am also EAA [Experimental Aircraft Association home-builders group BR] member belong Vintage Sailplane Society couple models have appeared VSS Bungee Cord magazine other claim fame organized Old-Timer RC 1969 East Coast Soaring Societys fifthranked sailplane pilot way back 1974 October 1993 55 AFTER YOU DID ALL THE WORK WHY LET YOUR AIRPLANE DO ALL THE FLYING INFO 50O Texas City Remote Control Club Third Annual Big War Bird Fly-In Sept 26 AMA 31032 5 Saicty Inspections MANDATORY Holland Park Texas City Texas Registration Tine 800 AM Registration Fee $1000 include 2 Meal Tickets information call Kimsey Pitts 409 945-5614 L Sponsor byS Debby Ccmtr-Clear Links 921 NASA RDAIRTRONIC IucFutaba Corp Ameilea HOIJSTONIX 77058IP0 BOX 2329 713488-mYSIrvine Ci 92718tov AngdesCA 90051-0329 also US team Soaring 1974 Aerolympics held Lakehurst Naval Air Station New Jersey placing first day 10th overall present time am member past president three sailplane clubs New Jersey Storm King Soaring Team North Jersey Soaring Society Sussex Thermal Snifflers have two great flying sites New York state airport New Jersey Attention Scale FansWe thank Rich sharing Scale project us like Rich interested Scale gliders whether antique modemI want call attention recently formed North American Scale Soaring Association NASSA group American Canadian Scale glider enthusiasts aim share information get together fun-type Scale glider flying includes both slope flatland thermal flying using both winch aerotow launching NASSAs annual dues $10 Send check information write NASSA 3540 Eastlake Drive West Richland WA 99352 Monthly club news provided via special page RIC Soaring Digestwhich should really subscribe anyway because its full kinds good Soaring info RCSD $19 per year Write PO Box 2108 Wylie TX 75098-2108 Tel 214 442-3910 Simple Gliders Quite few letters receive read something like Im retired living fixed income cant afford $500 all-compo site six-servo computer-controlled super sailplanes youre always featuring dont write about simple two- threechannel gliders fun fly inexpensive Believe take letters seriouslyand plead guilty often getting caught up technology race excuse writers viewpoint its great fun able write about sailplanes radios equipment new improved faster better exotic etc guess thats automobile magazines full reports Ferraris Lamborghinis Bentleyscars nobody can afford Rol Klingberg sent sample kit new Thermal Thing has suggested retail price $2995 figured would fun plane fly plus its inexpensive retirees glider ever saw Rols ad copy stresses low cost allout flying fun Thermal Thing cant beat Designed modelers have built least plane first-timers will have little help plane will give money other Two-Meter class glider Continued page 66 56 Model Aviation INE FEVER want new jet model look like jet also FLYLIKEA JET first turbojet engine kit now available diameter approx 110 mm weight approx O0 g thrust approx 30 N proved design F ipi Ing Schreckling ha flown successfully since 1989 sound performance absolutely accordance original -fuel either diesel kerosene suitable - simple individual installation tanks SCHNEIDER-SANCHEZ no noise problems 75 db Am GesmbH runen Weg 5 -8813 St Lambrecht Please contact usforfurther information tria/Europe International patents pendingTelFax 0043/3585/2422 Tel 0043 / 3585 / 2486 BUILD & FLY THE miniMAX YOURSELF 1 1 Fr ~r \O Resenjnd Cham1,,t UltralightPart 103 ultralightEasy Construction -Fun Ply-InWood Construction TEAM n 10790-MA Ivy Bluff Rd Bradyville TN 37026 765-5397 five minutes can upgrade stan dard Futaba Airtronics servos ball bearing servos new EMS Ball Bearing Conversion Kit New case tops accurately molded super tough glass filled fuel-proof Celcon include top quality stainless steel ball bearing servo output shaft * Stops case top andlor plastic bushing wear * Prevents output gear shaft shimmy * Reduces friction improves servo centering * Enhances performance airplanes boats & cars * Mandatory helicopter servos * Free output arm provided case top * Guaranteed against breakage year * Why pay $3995 $2995 IBC-1 Fits FUTABA 528/5128 S38/S138 S48/S148 Servos set 4$2595 rnC2As above set 1$695 '-3Fits AIRTRONICS 94102 Servos set 4$2595 -4 As above set 1 $695 nii5 Ball Bearing Only JR 501 507 RCD APOLLO 05 10 FOCUS HS300 HS500 ACE 330342 342HS TOWER TS-51 Servos set 4$1995 Add $300 Shipping Handling orders ne714 692-1393 Info OnlyCalifornia Residents Add 775% sales Tax 800 845-8978 Orders OnlyVISA MASTERCARD Accepted * * Long Engine Life * * Use BRU LINE Air Cleaner Completely Fuel Proof Nylon Rubber Parts Cat No 102 Air Cleaner Coarse $299 Cat No 202 Air Cleaner Fine $299 Replacement Inserts Cat No 104 Pkl2 Inserts Coarse $239 Cat No 204 Pkl2 Inserts Fine $239 FITS MOST ENGINES 25and UP SEE YOUR LOCAL HOBBY DEALER IF UNAVAILABLE LOCALLY SEND TO Bru Line Industries Inc po Box 3786 Center Line Michigan 48015 lAdd $250 shipping igan residents add 4% sales tax RC SoaringlBlakeslee Continued page 56 Thermal Thing can built either 71- 77-inch wingspan 430square-inch wing area minimum weight 16 ounces Itll take 049 engine want go route Thermal Thing kits should available local hobby shops can order directly Future Flight 1256 Prescott Ave Sunnyvale CA 94089 Rol has limitedtime special mail order price$ 15 plus $5 shipping handling Cant beat Other simple gliders would include just about Two-Meter kits put out trainers Carl Goldberg sells lot Gentle Lady kits because inexpensive fly quite well little money like Airtronics Oly 650 because its excellent kit build its very sturdy bounces better its fine flier Ace Easy Eagle designed Harley Michaelis Great Planes Spirit designed Paul Carlson also nice simple gliders want go larger 100-inchspan model Airtronics Oly II alltime favorite trainer can flown rudder elevator although addition spoilers good idea Great Planes Spirit 100 also seems like smart choice because includes material build either slower S3010 faster S7037 airfoil wing can put ailerons flaps thats getting away simple sailplane premise Simple Electric gliders much different pure trainer-type gliders mentioned above Actually Electrics very good way learn fly gliders just have fun dinking around Six-or seven-cell Electrics have lot going because popularity RC cars motors batteries chargers quite inexpensive can launch Two-Meter-size Electric relatively small area no high-start winch line stretch out really no need run motor longer get plane up higher about 75 100 feet gives practice finding using lower level lift exactly what Joe Wurts recommends doing hand-launch glideronly starting little higher can throw theres no lift just restart motor Depending motor-battery-prop combination could get up 10 throws out charge Also stop think about Electrics perfect slope soaring extra weight usually advantage slope breeze stops just switch motor Think envious flying buddies will trek bottom slope retrieve Continued page 82 66 Model Aviation Yorba Linda C. above statements made Clarence Lee Don Lowe Howard Crisp/n IEEE Tack Support 202-177-1712 TUE LiIAI DEALE HE CALL less coesgieta calalag mud uN-addresud 750 stamped #10 eveIepe 18311 esallted let order HAVE MUIR PROIICTS I 141 MA rd CT WE I71-1MI interested obtaining copy list can write Tomas Mejzlik Jurkovicova 19 63800 Brno Czechol Czechoslovakia can also send SASE Ill send photocopy Till next time. oaringlBlakeslee Continued page 66 gliders Simple Electric kits include Airtronics Eclipse Deluxe Graupner UHU Astro Flight Challenger Davey Systems Lucifer Great Planes Spectra similar Two-Meter Electric kits use six- seven-cell battery packs inexpensive motors lot fun buck New Skimmer Electric sailplane latest addition above list fun Electrics Skimmer Hobby Lobby International HLI rudderelevator-motor control 70-inch-span allwood kit selling $48 Jim Martin HLI very excited about new design says performs like $300 custom Electric sailplane says Skimmer will climb speck height two three times charge power off prop folded Jim guarantees will catch thermals has Selig 3021 airfoil 532-squareinch wing area total weight 44 ounces 12-ounce-per-square-foot wing loading battery compartment bottom under wing dont need take wing off swap batteries Recommended drive system Graupner Speed 600 motor six cells 7 x 3 prop seven cells 8 x 41/2 prop Speed 600 motor folding propeller $33 An on/off motor controller Battery Eliminator Circuit BEC also required Hitec 1003 costs less $30 works fine video available Skimmer $9 get $6 back return Hobby Lobby also has excellentfree 124page catalog order request catalog further information write Hobby Lobby 5614 Franklin Pike Circle Brentwood TN 37027 Tel 615 373-1444 odel Aviation ply Dust. Teat ad 8818 S Metea Muff laP Thinks its pipe itiii Meat Effective Muffler SIG MANUFACTURING CO now imports complete line world record holding ROSSI aircraft marine helicopter race car engines includes full line parts accessories plus full time ROSSI REPAIR CENTER US SIG-imported ROSSI engines come full 90 day SIG WARRANTY against work manship manufacturing defects SIG MANUFACTURING CO INC PH 515-623-5154 FAX 515-623-3922 Montezuma IA 50171 Toll Free Orders 800-247-5008
Edition: Model Aviation - 1993/10
Page Numbers: 52, 53, 55, 56, 66, 82
RADIO CONTROL SOARING MY JUNE 1993 COLUMN piece compared three airfoils 53021 Michael Seligs redesign Eppler 205 SD7037PT Princeton Test airfoil built Harley Michaelis real SD7037 designed Selig Donovan Fritz Bien pointed out Michaelis built SD7O37PT airfoil actually shaped closer S3021 SD7037 Michael Selig agreed Fritz want obtain performance shown Soartech #8 Princeton wind tunnel test data compiled youd better make wing airfoil same Harley built fact nobody knows Michaelis-built SD7O37PT compares real SD7037 Fritzs conclusion airfoil Harley made right approach having great drag polar lOOK Re range main difference between Michaelis airfoil 53021 SD7037 entry angle front top surface shallower 0030 inches out 12-inch chord Fritz went suggest Harley created super-airfoil Maybe should designated SDM7037 honor Harley Since offic4il coordinates available builders need look Airfoil Comparison Plots section back Soartech #8 learn what SDM7037 looks like Anyway Harley read aerodynamic theory June column much interest good humor kind enough sit down write us letter describing whole episode also brings up problems arise try build perfect wing think sailplane builders will find much wonder about Heres Harleys letter think should dispel notion building SD7037 model tested Princeton did some great insight Results matter blind luck rather planning part truth step initial plotting final glassing provided opportunity unintentionally stray original coordinates prepared plots Chuck Andersons Airfoil Plotting Program using nine-pin dot-matrix printer old two- floppy-disk computer specifying 146 inch skin thickness 120-inch chord plot sent paper plots Bob Sealy made templates cut cores Obviously can take no credit cores work Now new 24-pin printer new computer still see minor variations identical plots evidenced laying plywood template weren t variations making templates thickness plot line presents source error airfoil represented outer perimeter plot line inner perimeter middle line Having made guess making templates able cut wavering intended path Really cut down middle assuming cut blade width distorts things thinnest blade makes cut about 020inch wide Thats 010-inch either side represents substantial deviation tolerances over 004-inch significant Michael Selig notes Next cutting core what mischief does hot wire example wrong wire wrong diameter too hot too cold sagging dragging unequal travel speed etc What happening wire briefly hangs up rough spot template smooth flat sanding block skinning use A6-inch sheeting skins some may under dimension some over some thinner edge As sand out irregularities airfoil being distorted Fashioning both leading edge trailing edge present opportunity distort still am unable make female LE template accurately rigid material using modelers tools find cant smoothly cut inside LE radius finest band saw blade end up hacking away jewelers files until template resembles intended contour 52 Model Aviation awley Buena Park CA says Leon Kincaid-designed Heat Seeker f lies super couldnt satisfied Thermal Thing glider Future Flight New Rol Klingberg design good simple glidersee text details 1930 Vintage Secondary Glider built scale Rich Tanis Hawthorne NJ test-glide hill Goffle Brook Park Hawthorne Again judge contour placing over yet another plot suspect accuracy Although friend Harry Smith cuts great cores inevitably LE shaping time discover structure does lend itself being shaped like template Its either too thick too thin times see discrepancies up 1A6-inch can far off So resort eyeball engineering modelers friend TLAR [that looks about rightBR] system building multiple-tapered wing surely have template increment did sanding blocks fiat have no tools accurately shape rounded radius descending dimensions Much said about keeping TE thin since impractical feather zero distortion inevitable Most wings have seen display disproportionate TE thickening represents builders limitation feather out wish some strength making 5D7037 model wind tunnel didnt need concerned about practicality field So extended fiberglass cloth layers together paper-thin surface likely impacted numbers favorabW impractical real world practice always make plot overlengthsay l0/16 inches actual chord 10 inches build wing 10-inch chord about 1/sninch thick TE 0007-inch carbon fiber laminate between 1A6-inch skins clearly TE distortion realistic trade-off bagging glass cloth directly over core TE thinner looks great subject easy chipping others raving about PT 5D7037 [92% thick 302% camber BR] thought should build wing Jouster design [construction article July 1993 MA-BR give airfoil best chance took particular care building wing Compared unheralded S2091 improved Aquila airfoil 101% thick 391% camber 5D7032 995% thick 366% camber impressed ship did get high tow kept boring higher speed handle well far less favorable stall characteristics did stay up well marginal lift seemed cruise faster could advantageous wind came hotter landing conclusion preferred other two airfoils mentioned Did get wing 5D7037 comparable Princeton model would know would builder know Sometimes think popularity airfoil product 1 some skilled flier happens win NATS 2 some prominent kit maker arbitrarily decides use based 1 3 everybody using must good fortunate have fine airfoil choices efforts Michael Selig John Donovan David Fraser builders provided models Princeton tests However talk about airfoils think should remember such things sound basic airframe design well-made wellaligned surfaces proper matching washout correct CG etc plenty practice vital success airfoil unquestioned superiority given application expected results would achieved October 1993 53 Now ou LAUNCH 01117 SOAR AND OUTIT LAND FOR LESS Genesis all-composite precision-molded thermal duration competition model manufactured US today Synergy F3B models highly competitive everything thermal duration slope racing Limited time pricing Genesis $449 Synergy III $599 Synergy 91 $549 SB/XC $749 Available exclusively Slegers International 201 366-0880 RnR Products 1120 Wrigley Way Milpitas CA 95035 408 946-4751 continued page SS GIANT SCALE MODELS CESSNA 150/152 10 SPAN 1/3 SCALE $475 DIASOLO gre SPAN 35% SCALE $285 VARIANT II 87 SPAN SPORT $16995 ulI shoil kits avaIlable acceasorlsa available amlsly Call writs free brochure ahowhg full prices hiciuds alsln Dsalsr Inquirsa Invited CmCEUEL 4302N 750W Ugcnier IN 46767 C219J S94-3370 Skimmer six- seven-cell electric glider Hobby Lobby offers another way launch good-flying thermal model R/C Combat Gremlin RUM 12192 Affordable Custom Cores Modelers Modelers Combat Oeemlint Cores $12 Shon kiss $20 templates no wood Fell kits wood $35 Combat newsletter witb tltortlfull kit S3021 SD7037 Centle Lady Spirit 2M full wing kiss $35 Upgrade glider en intermediate level aew wing Dodger Larsen 25 Qeickee 500 cores $6 per pair Custom pee-sheeted wings available balsa obechi Let us cat ccxl club project Custom core quantity discounts orders add $5 S&l-l COrts add $6 additional RA Cores po nos g63 Sostbbeidge MA 01550 500 765-9990 DISCOVER ELECTRIC RTP FLYING Catalog including Ballards imports $1 SKONK WORKS 1890 Forestdale Ave Beavercreek OH 45432 513 429-2411 Interested Soaring Electric Flight Great So Are Northeast Sailplane Products carry comprehensive line silent flight prod ucts industry sell RIG Sail planes Electrics related accessories reference features hundreds products doz ens informative articles technical infor mation great sport RIO silent flight can meet needs abilities beginner expert dedicated pro viding personal customer service Check out NSP..youll glad did Welcome world NSP first open unique reference will awe number quality products have Also ordering us easy fun because help step way order reference mail $700 $5 plus $2 s&h NSF Well ship reference via express mail arent completely satisfied simply send back prompt courteous refund Northeast Sailplane Products 16 Kirby Lane Williston Vermont 05495 Sailplane Products 1993 RC Soaring Electric Reference Northeast N N Price $5 Northeast SaIlplane Products Irby Lane WIllIston VT 05495 comprehensive reference Radio Control Soaring Electric Flight RC SoaringlBlakeslee Continued paqe 53 other things being right pilot being skilled Whereas acceptable tolerances expressed thousandths inch typical tools techniques materials used bulk builders lucky build hundredths question possible build wing intentionally match set coordinates think could could prove anyway thanks Harley thoughtful comments Most us have intuitive feeling its practically impossible build wing perfect airfoil probably have stopped consider alt ways go wrong personal experience can offer another way Last year friend Kal Kanyo bagged glass-over-white-foam wing supposed have HQ 25/90 airfoil bit too much vacuum kind squeezed little airfoil probably came out about 225/85 still flew fine Ill bet surprised learn Harley isnt overly fond airfoil SD7037 brings up another important aspect flying RC gliders flier needs select sailplane airfoil combination comfortable Some people prefer lighter slower models some like heavier faster newcomer hobby need experiment series kits course can take years normal progression start trainer-type designs lighter/slower-flying gliders designs will use higher-lift airfoils fairly thick higher camber eg 5D7032 have wing loadings around 10 ounces per square foot less After awhile may feel need speed can look some heavier/faster designs use lower-lift airfoils like HQ 20/80 RGl5 thinner less cambered Wing loadings will over 12 ounces per square foot Heavier designs will ordinarily have stronger airframes will capable dealing wider variety flying conditionslike windy weather Harley hinted name game finding setup suits own flying style local conditions find large part enjoyment RC soaring Vintage M&M Secondary Glider Rich Tanis Hawthorne New Jersey sent photos letter describing very interestingScaie project Enclosed photos latest glider project completed time display last weeks WRAM show New York thought readers might enjoy seeing antique plane type M&M Secondary Glider appeared 60 years ago 1930 edition Modem Mechanix magazine full-scale home builders project 1930 could buy plane ready fly $300 developed plans some 22 years ago set aside recently completed plans built model took three months Wingspan 102 inches chord 135 inches body 76 inches long weight six pounds glider has open cockpit seat backrest -scale pilot working joystick seat belt rndder pedals few features some 70 feet cables used rig wings body pull-pull rndder elevator two servos behind pilots seat two wing Covering 21st Century fabric some 100 handmade brass parts project flying wires work needed keep planes tail section body line am also EAA [Experimental Aircraft Association home-builders group BR] member belong Vintage Sailplane Society couple models have appeared VSS Bungee Cord magazine other claim fame organized Old-Timer RC 1969 East Coast Soaring Societys fifthranked sailplane pilot way back 1974 October 1993 55 AFTER YOU DID ALL THE WORK WHY LET YOUR AIRPLANE DO ALL THE FLYING INFO 50O Texas City Remote Control Club Third Annual Big War Bird Fly-In Sept 26 AMA 31032 5 Saicty Inspections MANDATORY Holland Park Texas City Texas Registration Tine 800 AM Registration Fee $1000 include 2 Meal Tickets information call Kimsey Pitts 409 945-5614 L Sponsor byS Debby Ccmtr-Clear Links 921 NASA RDAIRTRONIC IucFutaba Corp Ameilea HOIJSTONIX 77058IP0 BOX 2329 713488-mYSIrvine Ci 92718tov AngdesCA 90051-0329 also US team Soaring 1974 Aerolympics held Lakehurst Naval Air Station New Jersey placing first day 10th overall present time am member past president three sailplane clubs New Jersey Storm King Soaring Team North Jersey Soaring Society Sussex Thermal Snifflers have two great flying sites New York state airport New Jersey Attention Scale FansWe thank Rich sharing Scale project us like Rich interested Scale gliders whether antique modemI want call attention recently formed North American Scale Soaring Association NASSA group American Canadian Scale glider enthusiasts aim share information get together fun-type Scale glider flying includes both slope flatland thermal flying using both winch aerotow launching NASSAs annual dues $10 Send check information write NASSA 3540 Eastlake Drive West Richland WA 99352 Monthly club news provided via special page RIC Soaring Digestwhich should really subscribe anyway because its full kinds good Soaring info RCSD $19 per year Write PO Box 2108 Wylie TX 75098-2108 Tel 214 442-3910 Simple Gliders Quite few letters receive read something like Im retired living fixed income cant afford $500 all-compo site six-servo computer-controlled super sailplanes youre always featuring dont write about simple two- threechannel gliders fun fly inexpensive Believe take letters seriouslyand plead guilty often getting caught up technology race excuse writers viewpoint its great fun able write about sailplanes radios equipment new improved faster better exotic etc guess thats automobile magazines full reports Ferraris Lamborghinis Bentleyscars nobody can afford Rol Klingberg sent sample kit new Thermal Thing has suggested retail price $2995 figured would fun plane fly plus its inexpensive retirees glider ever saw Rols ad copy stresses low cost allout flying fun Thermal Thing cant beat Designed modelers have built least plane first-timers will have little help plane will give money other Two-Meter class glider Continued page 66 56 Model Aviation INE FEVER want new jet model look like jet also FLYLIKEA JET first turbojet engine kit now available diameter approx 110 mm weight approx O0 g thrust approx 30 N proved design F ipi Ing Schreckling ha flown successfully since 1989 sound performance absolutely accordance original -fuel either diesel kerosene suitable - simple individual installation tanks SCHNEIDER-SANCHEZ no noise problems 75 db Am GesmbH runen Weg 5 -8813 St Lambrecht Please contact usforfurther information tria/Europe International patents pendingTelFax 0043/3585/2422 Tel 0043 / 3585 / 2486 BUILD & FLY THE miniMAX YOURSELF 1 1 Fr ~r \O Resenjnd Cham1,,t UltralightPart 103 ultralightEasy Construction -Fun Ply-InWood Construction TEAM n 10790-MA Ivy Bluff Rd Bradyville TN 37026 765-5397 five minutes can upgrade stan dard Futaba Airtronics servos ball bearing servos new EMS Ball Bearing Conversion Kit New case tops accurately molded super tough glass filled fuel-proof Celcon include top quality stainless steel ball bearing servo output shaft * Stops case top andlor plastic bushing wear * Prevents output gear shaft shimmy * Reduces friction improves servo centering * Enhances performance airplanes boats & cars * Mandatory helicopter servos * Free output arm provided case top * Guaranteed against breakage year * Why pay $3995 $2995 IBC-1 Fits FUTABA 528/5128 S38/S138 S48/S148 Servos set 4$2595 rnC2As above set 1$695 '-3Fits AIRTRONICS 94102 Servos set 4$2595 -4 As above set 1 $695 nii5 Ball Bearing Only JR 501 507 RCD APOLLO 05 10 FOCUS HS300 HS500 ACE 330342 342HS TOWER TS-51 Servos set 4$1995 Add $300 Shipping Handling orders ne714 692-1393 Info OnlyCalifornia Residents Add 775% sales Tax 800 845-8978 Orders OnlyVISA MASTERCARD Accepted * * Long Engine Life * * Use BRU LINE Air Cleaner Completely Fuel Proof Nylon Rubber Parts Cat No 102 Air Cleaner Coarse $299 Cat No 202 Air Cleaner Fine $299 Replacement Inserts Cat No 104 Pkl2 Inserts Coarse $239 Cat No 204 Pkl2 Inserts Fine $239 FITS MOST ENGINES 25and UP SEE YOUR LOCAL HOBBY DEALER IF UNAVAILABLE LOCALLY SEND TO Bru Line Industries Inc po Box 3786 Center Line Michigan 48015 lAdd $250 shipping igan residents add 4% sales tax RC SoaringlBlakeslee Continued page 56 Thermal Thing can built either 71- 77-inch wingspan 430square-inch wing area minimum weight 16 ounces Itll take 049 engine want go route Thermal Thing kits should available local hobby shops can order directly Future Flight 1256 Prescott Ave Sunnyvale CA 94089 Rol has limitedtime special mail order price$ 15 plus $5 shipping handling Cant beat Other simple gliders would include just about Two-Meter kits put out trainers Carl Goldberg sells lot Gentle Lady kits because inexpensive fly quite well little money like Airtronics Oly 650 because its excellent kit build its very sturdy bounces better its fine flier Ace Easy Eagle designed Harley Michaelis Great Planes Spirit designed Paul Carlson also nice simple gliders want go larger 100-inchspan model Airtronics Oly II alltime favorite trainer can flown rudder elevator although addition spoilers good idea Great Planes Spirit 100 also seems like smart choice because includes material build either slower S3010 faster S7037 airfoil wing can put ailerons flaps thats getting away simple sailplane premise Simple Electric gliders much different pure trainer-type gliders mentioned above Actually Electrics very good way learn fly gliders just have fun dinking around Six-or seven-cell Electrics have lot going because popularity RC cars motors batteries chargers quite inexpensive can launch Two-Meter-size Electric relatively small area no high-start winch line stretch out really no need run motor longer get plane up higher about 75 100 feet gives practice finding using lower level lift exactly what Joe Wurts recommends doing hand-launch glideronly starting little higher can throw theres no lift just restart motor Depending motor-battery-prop combination could get up 10 throws out charge Also stop think about Electrics perfect slope soaring extra weight usually advantage slope breeze stops just switch motor Think envious flying buddies will trek bottom slope retrieve Continued page 82 66 Model Aviation Yorba Linda C. above statements made Clarence Lee Don Lowe Howard Crisp/n IEEE Tack Support 202-177-1712 TUE LiIAI DEALE HE CALL less coesgieta calalag mud uN-addresud 750 stamped #10 eveIepe 18311 esallted let order HAVE MUIR PROIICTS I 141 MA rd CT WE I71-1MI interested obtaining copy list can write Tomas Mejzlik Jurkovicova 19 63800 Brno Czechol Czechoslovakia can also send SASE Ill send photocopy Till next time. oaringlBlakeslee Continued page 66 gliders Simple Electric kits include Airtronics Eclipse Deluxe Graupner UHU Astro Flight Challenger Davey Systems Lucifer Great Planes Spectra similar Two-Meter Electric kits use six- seven-cell battery packs inexpensive motors lot fun buck New Skimmer Electric sailplane latest addition above list fun Electrics Skimmer Hobby Lobby International HLI rudderelevator-motor control 70-inch-span allwood kit selling $48 Jim Martin HLI very excited about new design says performs like $300 custom Electric sailplane says Skimmer will climb speck height two three times charge power off prop folded Jim guarantees will catch thermals has Selig 3021 airfoil 532-squareinch wing area total weight 44 ounces 12-ounce-per-square-foot wing loading battery compartment bottom under wing dont need take wing off swap batteries Recommended drive system Graupner Speed 600 motor six cells 7 x 3 prop seven cells 8 x 41/2 prop Speed 600 motor folding propeller $33 An on/off motor controller Battery Eliminator Circuit BEC also required Hitec 1003 costs less $30 works fine video available Skimmer $9 get $6 back return Hobby Lobby also has excellentfree 124page catalog order request catalog further information write Hobby Lobby 5614 Franklin Pike Circle Brentwood TN 37027 Tel 615 373-1444 odel Aviation ply Dust. Teat ad 8818 S Metea Muff laP Thinks its pipe itiii Meat Effective Muffler SIG MANUFACTURING CO now imports complete line world record holding ROSSI aircraft marine helicopter race car engines includes full line parts accessories plus full time ROSSI REPAIR CENTER US SIG-imported ROSSI engines come full 90 day SIG WARRANTY against work manship manufacturing defects SIG MANUFACTURING CO INC PH 515-623-5154 FAX 515-623-3922 Montezuma IA 50171 Toll Free Orders 800-247-5008
Edition: Model Aviation - 1993/10
Page Numbers: 52, 53, 55, 56, 66, 82
RADIO CONTROL SOARING MY JUNE 1993 COLUMN piece compared three airfoils 53021 Michael Seligs redesign Eppler 205 SD7037PT Princeton Test airfoil built Harley Michaelis real SD7037 designed Selig Donovan Fritz Bien pointed out Michaelis built SD7O37PT airfoil actually shaped closer S3021 SD7037 Michael Selig agreed Fritz want obtain performance shown Soartech #8 Princeton wind tunnel test data compiled youd better make wing airfoil same Harley built fact nobody knows Michaelis-built SD7O37PT compares real SD7037 Fritzs conclusion airfoil Harley made right approach having great drag polar lOOK Re range main difference between Michaelis airfoil 53021 SD7037 entry angle front top surface shallower 0030 inches out 12-inch chord Fritz went suggest Harley created super-airfoil Maybe should designated SDM7037 honor Harley Since offic4il coordinates available builders need look Airfoil Comparison Plots section back Soartech #8 learn what SDM7037 looks like Anyway Harley read aerodynamic theory June column much interest good humor kind enough sit down write us letter describing whole episode also brings up problems arise try build perfect wing think sailplane builders will find much wonder about Heres Harleys letter think should dispel notion building SD7037 model tested Princeton did some great insight Results matter blind luck rather planning part truth step initial plotting final glassing provided opportunity unintentionally stray original coordinates prepared plots Chuck Andersons Airfoil Plotting Program using nine-pin dot-matrix printer old two- floppy-disk computer specifying 146 inch skin thickness 120-inch chord plot sent paper plots Bob Sealy made templates cut cores Obviously can take no credit cores work Now new 24-pin printer new computer still see minor variations identical plots evidenced laying plywood template weren t variations making templates thickness plot line presents source error airfoil represented outer perimeter plot line inner perimeter middle line Having made guess making templates able cut wavering intended path Really cut down middle assuming cut blade width distorts things thinnest blade makes cut about 020inch wide Thats 010-inch either side represents substantial deviation tolerances over 004-inch significant Michael Selig notes Next cutting core what mischief does hot wire example wrong wire wrong diameter too hot too cold sagging dragging unequal travel speed etc What happening wire briefly hangs up rough spot template smooth flat sanding block skinning use A6-inch sheeting skins some may under dimension some over some thinner edge As sand out irregularities airfoil being distorted Fashioning both leading edge trailing edge present opportunity distort still am unable make female LE template accurately rigid material using modelers tools find cant smoothly cut inside LE radius finest band saw blade end up hacking away jewelers files until template resembles intended contour 52 Model Aviation awley Buena Park CA says Leon Kincaid-designed Heat Seeker f lies super couldnt satisfied Thermal Thing glider Future Flight New Rol Klingberg design good simple glidersee text details 1930 Vintage Secondary Glider built scale Rich Tanis Hawthorne NJ test-glide hill Goffle Brook Park Hawthorne Again judge contour placing over yet another plot suspect accuracy Although friend Harry Smith cuts great cores inevitably LE shaping time discover structure does lend itself being shaped like template Its either too thick too thin times see discrepancies up 1A6-inch can far off So resort eyeball engineering modelers friend TLAR [that looks about rightBR] system building multiple-tapered wing surely have template increment did sanding blocks fiat have no tools accurately shape rounded radius descending dimensions Much said about keeping TE thin since impractical feather zero distortion inevitable Most wings have seen display disproportionate TE thickening represents builders limitation feather out wish some strength making 5D7037 model wind tunnel didnt need concerned about practicality field So extended fiberglass cloth layers together paper-thin surface likely impacted numbers favorabW impractical real world practice always make plot overlengthsay l0/16 inches actual chord 10 inches build wing 10-inch chord about 1/sninch thick TE 0007-inch carbon fiber laminate between 1A6-inch skins clearly TE distortion realistic trade-off bagging glass cloth directly over core TE thinner looks great subject easy chipping others raving about PT 5D7037 [92% thick 302% camber BR] thought should build wing Jouster design [construction article July 1993 MA-BR give airfoil best chance took particular care building wing Compared unheralded S2091 improved Aquila airfoil 101% thick 391% camber 5D7032 995% thick 366% camber impressed ship did get high tow kept boring higher speed handle well far less favorable stall characteristics did stay up well marginal lift seemed cruise faster could advantageous wind came hotter landing conclusion preferred other two airfoils mentioned Did get wing 5D7037 comparable Princeton model would know would builder know Sometimes think popularity airfoil product 1 some skilled flier happens win NATS 2 some prominent kit maker arbitrarily decides use based 1 3 everybody using must good fortunate have fine airfoil choices efforts Michael Selig John Donovan David Fraser builders provided models Princeton tests However talk about airfoils think should remember such things sound basic airframe design well-made wellaligned surfaces proper matching washout correct CG etc plenty practice vital success airfoil unquestioned superiority given application expected results would achieved October 1993 53 Now ou LAUNCH 01117 SOAR AND OUTIT LAND FOR LESS Genesis all-composite precision-molded thermal duration competition model manufactured US today Synergy F3B models highly competitive everything thermal duration slope racing Limited time pricing Genesis $449 Synergy III $599 Synergy 91 $549 SB/XC $749 Available exclusively Slegers International 201 366-0880 RnR Products 1120 Wrigley Way Milpitas CA 95035 408 946-4751 continued page SS GIANT SCALE MODELS CESSNA 150/152 10 SPAN 1/3 SCALE $475 DIASOLO gre SPAN 35% SCALE $285 VARIANT II 87 SPAN SPORT $16995 ulI shoil kits avaIlable acceasorlsa available amlsly Call writs free brochure ahowhg full prices hiciuds alsln Dsalsr Inquirsa Invited CmCEUEL 4302N 750W Ugcnier IN 46767 C219J S94-3370 Skimmer six- seven-cell electric glider Hobby Lobby offers another way launch good-flying thermal model R/C Combat Gremlin RUM 12192 Affordable Custom Cores Modelers Modelers Combat Oeemlint Cores $12 Shon kiss $20 templates no wood Fell kits wood $35 Combat newsletter witb tltortlfull kit S3021 SD7037 Centle Lady Spirit 2M full wing kiss $35 Upgrade glider en intermediate level aew wing Dodger Larsen 25 Qeickee 500 cores $6 per pair Custom pee-sheeted wings available balsa obechi Let us cat ccxl club project Custom core quantity discounts orders add $5 S&l-l COrts add $6 additional RA Cores po nos g63 Sostbbeidge MA 01550 500 765-9990 DISCOVER ELECTRIC RTP FLYING Catalog including Ballards imports $1 SKONK WORKS 1890 Forestdale Ave Beavercreek OH 45432 513 429-2411 Interested Soaring Electric Flight Great So Are Northeast Sailplane Products carry comprehensive line silent flight prod ucts industry sell RIG Sail planes Electrics related accessories reference features hundreds products doz ens informative articles technical infor mation great sport RIO silent flight can meet needs abilities beginner expert dedicated pro viding personal customer service Check out NSP..youll glad did Welcome world NSP first open unique reference will awe number quality products have Also ordering us easy fun because help step way order reference mail $700 $5 plus $2 s&h NSF Well ship reference via express mail arent completely satisfied simply send back prompt courteous refund Northeast Sailplane Products 16 Kirby Lane Williston Vermont 05495 Sailplane Products 1993 RC Soaring Electric Reference Northeast N N Price $5 Northeast SaIlplane Products Irby Lane WIllIston VT 05495 comprehensive reference Radio Control Soaring Electric Flight RC SoaringlBlakeslee Continued paqe 53 other things being right pilot being skilled Whereas acceptable tolerances expressed thousandths inch typical tools techniques materials used bulk builders lucky build hundredths question possible build wing intentionally match set coordinates think could could prove anyway thanks Harley thoughtful comments Most us have intuitive feeling its practically impossible build wing perfect airfoil probably have stopped consider alt ways go wrong personal experience can offer another way Last year friend Kal Kanyo bagged glass-over-white-foam wing supposed have HQ 25/90 airfoil bit too much vacuum kind squeezed little airfoil probably came out about 225/85 still flew fine Ill bet surprised learn Harley isnt overly fond airfoil SD7037 brings up another important aspect flying RC gliders flier needs select sailplane airfoil combination comfortable Some people prefer lighter slower models some like heavier faster newcomer hobby need experiment series kits course can take years normal progression start trainer-type designs lighter/slower-flying gliders designs will use higher-lift airfoils fairly thick higher camber eg 5D7032 have wing loadings around 10 ounces per square foot less After awhile may feel need speed can look some heavier/faster designs use lower-lift airfoils like HQ 20/80 RGl5 thinner less cambered Wing loadings will over 12 ounces per square foot Heavier designs will ordinarily have stronger airframes will capable dealing wider variety flying conditionslike windy weather Harley hinted name game finding setup suits own flying style local conditions find large part enjoyment RC soaring Vintage M&M Secondary Glider Rich Tanis Hawthorne New Jersey sent photos letter describing very interestingScaie project Enclosed photos latest glider project completed time display last weeks WRAM show New York thought readers might enjoy seeing antique plane type M&M Secondary Glider appeared 60 years ago 1930 edition Modem Mechanix magazine full-scale home builders project 1930 could buy plane ready fly $300 developed plans some 22 years ago set aside recently completed plans built model took three months Wingspan 102 inches chord 135 inches body 76 inches long weight six pounds glider has open cockpit seat backrest -scale pilot working joystick seat belt rndder pedals few features some 70 feet cables used rig wings body pull-pull rndder elevator two servos behind pilots seat two wing Covering 21st Century fabric some 100 handmade brass parts project flying wires work needed keep planes tail section body line am also EAA [Experimental Aircraft Association home-builders group BR] member belong Vintage Sailplane Society couple models have appeared VSS Bungee Cord magazine other claim fame organized Old-Timer RC 1969 East Coast Soaring Societys fifthranked sailplane pilot way back 1974 October 1993 55 AFTER YOU DID ALL THE WORK WHY LET YOUR AIRPLANE DO ALL THE FLYING INFO 50O Texas City Remote Control Club Third Annual Big War Bird Fly-In Sept 26 AMA 31032 5 Saicty Inspections MANDATORY Holland Park Texas City Texas Registration Tine 800 AM Registration Fee $1000 include 2 Meal Tickets information call Kimsey Pitts 409 945-5614 L Sponsor byS Debby Ccmtr-Clear Links 921 NASA RDAIRTRONIC IucFutaba Corp Ameilea HOIJSTONIX 77058IP0 BOX 2329 713488-mYSIrvine Ci 92718tov AngdesCA 90051-0329 also US team Soaring 1974 Aerolympics held Lakehurst Naval Air Station New Jersey placing first day 10th overall present time am member past president three sailplane clubs New Jersey Storm King Soaring Team North Jersey Soaring Society Sussex Thermal Snifflers have two great flying sites New York state airport New Jersey Attention Scale FansWe thank Rich sharing Scale project us like Rich interested Scale gliders whether antique modemI want call attention recently formed North American Scale Soaring Association NASSA group American Canadian Scale glider enthusiasts aim share information get together fun-type Scale glider flying includes both slope flatland thermal flying using both winch aerotow launching NASSAs annual dues $10 Send check information write NASSA 3540 Eastlake Drive West Richland WA 99352 Monthly club news provided via special page RIC Soaring Digestwhich should really subscribe anyway because its full kinds good Soaring info RCSD $19 per year Write PO Box 2108 Wylie TX 75098-2108 Tel 214 442-3910 Simple Gliders Quite few letters receive read something like Im retired living fixed income cant afford $500 all-compo site six-servo computer-controlled super sailplanes youre always featuring dont write about simple two- threechannel gliders fun fly inexpensive Believe take letters seriouslyand plead guilty often getting caught up technology race excuse writers viewpoint its great fun able write about sailplanes radios equipment new improved faster better exotic etc guess thats automobile magazines full reports Ferraris Lamborghinis Bentleyscars nobody can afford Rol Klingberg sent sample kit new Thermal Thing has suggested retail price $2995 figured would fun plane fly plus its inexpensive retirees glider ever saw Rols ad copy stresses low cost allout flying fun Thermal Thing cant beat Designed modelers have built least plane first-timers will have little help plane will give money other Two-Meter class glider Continued page 66 56 Model Aviation INE FEVER want new jet model look like jet also FLYLIKEA JET first turbojet engine kit now available diameter approx 110 mm weight approx O0 g thrust approx 30 N proved design F ipi Ing Schreckling ha flown successfully since 1989 sound performance absolutely accordance original -fuel either diesel kerosene suitable - simple individual installation tanks SCHNEIDER-SANCHEZ no noise problems 75 db Am GesmbH runen Weg 5 -8813 St Lambrecht Please contact usforfurther information tria/Europe International patents pendingTelFax 0043/3585/2422 Tel 0043 / 3585 / 2486 BUILD & FLY THE miniMAX YOURSELF 1 1 Fr ~r \O Resenjnd Cham1,,t UltralightPart 103 ultralightEasy Construction -Fun Ply-InWood Construction TEAM n 10790-MA Ivy Bluff Rd Bradyville TN 37026 765-5397 five minutes can upgrade stan dard Futaba Airtronics servos ball bearing servos new EMS Ball Bearing Conversion Kit New case tops accurately molded super tough glass filled fuel-proof Celcon include top quality stainless steel ball bearing servo output shaft * Stops case top andlor plastic bushing wear * Prevents output gear shaft shimmy * Reduces friction improves servo centering * Enhances performance airplanes boats & cars * Mandatory helicopter servos * Free output arm provided case top * Guaranteed against breakage year * Why pay $3995 $2995 IBC-1 Fits FUTABA 528/5128 S38/S138 S48/S148 Servos set 4$2595 rnC2As above set 1$695 '-3Fits AIRTRONICS 94102 Servos set 4$2595 -4 As above set 1 $695 nii5 Ball Bearing Only JR 501 507 RCD APOLLO 05 10 FOCUS HS300 HS500 ACE 330342 342HS TOWER TS-51 Servos set 4$1995 Add $300 Shipping Handling orders ne714 692-1393 Info OnlyCalifornia Residents Add 775% sales Tax 800 845-8978 Orders OnlyVISA MASTERCARD Accepted * * Long Engine Life * * Use BRU LINE Air Cleaner Completely Fuel Proof Nylon Rubber Parts Cat No 102 Air Cleaner Coarse $299 Cat No 202 Air Cleaner Fine $299 Replacement Inserts Cat No 104 Pkl2 Inserts Coarse $239 Cat No 204 Pkl2 Inserts Fine $239 FITS MOST ENGINES 25and UP SEE YOUR LOCAL HOBBY DEALER IF UNAVAILABLE LOCALLY SEND TO Bru Line Industries Inc po Box 3786 Center Line Michigan 48015 lAdd $250 shipping igan residents add 4% sales tax RC SoaringlBlakeslee Continued page 56 Thermal Thing can built either 71- 77-inch wingspan 430square-inch wing area minimum weight 16 ounces Itll take 049 engine want go route Thermal Thing kits should available local hobby shops can order directly Future Flight 1256 Prescott Ave Sunnyvale CA 94089 Rol has limitedtime special mail order price$ 15 plus $5 shipping handling Cant beat Other simple gliders would include just about Two-Meter kits put out trainers Carl Goldberg sells lot Gentle Lady kits because inexpensive fly quite well little money like Airtronics Oly 650 because its excellent kit build its very sturdy bounces better its fine flier Ace Easy Eagle designed Harley Michaelis Great Planes Spirit designed Paul Carlson also nice simple gliders want go larger 100-inchspan model Airtronics Oly II alltime favorite trainer can flown rudder elevator although addition spoilers good idea Great Planes Spirit 100 also seems like smart choice because includes material build either slower S3010 faster S7037 airfoil wing can put ailerons flaps thats getting away simple sailplane premise Simple Electric gliders much different pure trainer-type gliders mentioned above Actually Electrics very good way learn fly gliders just have fun dinking around Six-or seven-cell Electrics have lot going because popularity RC cars motors batteries chargers quite inexpensive can launch Two-Meter-size Electric relatively small area no high-start winch line stretch out really no need run motor longer get plane up higher about 75 100 feet gives practice finding using lower level lift exactly what Joe Wurts recommends doing hand-launch glideronly starting little higher can throw theres no lift just restart motor Depending motor-battery-prop combination could get up 10 throws out charge Also stop think about Electrics perfect slope soaring extra weight usually advantage slope breeze stops just switch motor Think envious flying buddies will trek bottom slope retrieve Continued page 82 66 Model Aviation Yorba Linda C. above statements made Clarence Lee Don Lowe Howard Crisp/n IEEE Tack Support 202-177-1712 TUE LiIAI DEALE HE CALL less coesgieta calalag mud uN-addresud 750 stamped #10 eveIepe 18311 esallted let order HAVE MUIR PROIICTS I 141 MA rd CT WE I71-1MI interested obtaining copy list can write Tomas Mejzlik Jurkovicova 19 63800 Brno Czechol Czechoslovakia can also send SASE Ill send photocopy Till next time. oaringlBlakeslee Continued page 66 gliders Simple Electric kits include Airtronics Eclipse Deluxe Graupner UHU Astro Flight Challenger Davey Systems Lucifer Great Planes Spectra similar Two-Meter Electric kits use six- seven-cell battery packs inexpensive motors lot fun buck New Skimmer Electric sailplane latest addition above list fun Electrics Skimmer Hobby Lobby International HLI rudderelevator-motor control 70-inch-span allwood kit selling $48 Jim Martin HLI very excited about new design says performs like $300 custom Electric sailplane says Skimmer will climb speck height two three times charge power off prop folded Jim guarantees will catch thermals has Selig 3021 airfoil 532-squareinch wing area total weight 44 ounces 12-ounce-per-square-foot wing loading battery compartment bottom under wing dont need take wing off swap batteries Recommended drive system Graupner Speed 600 motor six cells 7 x 3 prop seven cells 8 x 41/2 prop Speed 600 motor folding propeller $33 An on/off motor controller Battery Eliminator Circuit BEC also required Hitec 1003 costs less $30 works fine video available Skimmer $9 get $6 back return Hobby Lobby also has excellentfree 124page catalog order request catalog further information write Hobby Lobby 5614 Franklin Pike Circle Brentwood TN 37027 Tel 615 373-1444 odel Aviation ply Dust. 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