Dihedral

NO OCR TEXT NO OCR TEXT gle proportional distance centerline airplane Figure 1 makes two main points First efficiency declines EDA increased Second parabolic wings efficient three types V-dihedral wings least ef ficient margin between wings very small Despite small size penalty di hedral performance loss we may well try min imize minimize loss means given EDA increase area mm imized key minimizing area putting dihedral effective place hand wing tip has best lever age wing good place put extra dihedral other hand though concentrate dihedral small area dihedral will have quite great As discussed above crease area increases rapidly crease dihedral concentration ap proach does pay off fact can least efficient way concentrated approach illustrated Figure 2 case line fol lowing labeled panel dihedral ra tio 1000 four-panel polyhedral wing has 1000 times much dihedral tip panel main panel main panel essentially flat wing has EDA 100 make main panel proportionately larger tip smaller tip has bend up farther farther time get panel break out 07 semi-span poor tip panel bent up 27 an see ef ficiency flat center panel wing falls off rapidly tip panel reduced less half semi-span Figures 2 3 show relative wing ef ficiency four types polyhedral wings Figure 2 wings 10 degrees EDA Figure 3 wings 15 de grees wing has four panels loca tion panel break varies cen terline airplane equivalent dihedral wing 90% way tip dihedral angle tip panel com pared main panel shown four ra tios 15 2 3 1000 15 ratio wing will look like slightly bent V dihedral wing 3 ratio wing classic polyhedral shape 1000 ratio wing really three-panel wing almost flat center panel Figures 2 3 show better distribute dihedral over entire wing dihedral nearer wing tip plots clear polyhedral wing panel break half way out wing tip-to-main dihedral ratio three efficient careful split hairs 100 EDA wings tal range efficiency ignoring threepanel wing 033% will alter du ration 15-minute still-air flight second range 150 EDA wings almost smallabout two sec onds 15-minute flight 104 Model Aviation straight-line pertormance penalty tor aineoral very small i ne reauction maxi mum glide ratio typical rudder elevator model about 1% compared equiva lent flat wing design 12 per side V-dihedral scheme authors Two Meter Tu tor shown good advantage Its V-dihedral chosen optimize circling abilities sim plify construction raise speed flutter occurs Also since two-piece wing relatively heavy joiner near CG its no detriment transitional maneuvers i ne tientie aay snows OTT tne very eiicieni iour-panei pciyneurw swiume usee ncr wing just over 14 Equivalent Dihedral Angle Gentle Lady displays blending good straight-line circling efficiency pleasant roll response sufficient spiral stability II Polyhedral V dihedral 051015 Equivalent Dihedral Angle degrees projected area true area ratio 099 0989 0988 0987 0986 0985 0984 0983 0982 0981 098 2025 Figure 2 ii-H 1111 I7Th-K j7 7t panel dihedral ratio 1000 0 01 02 03 04 05 06 rootPanel Break Location fraction semi-span 0708 09 tip Figure 1 Straight-line efficiency falls off proportionally increased dihedral effective prolected area wing diminished relative its actual surface area dihedral Increased profile drag increased wing profile drag fraction total drag sen sitivity dihedral angle very great Note both parabolic dihedral four-panel-polyhedral wings marginally ef ficient V-dihedral wing Figure 2 plot examines effect wing panel break location efficiency wing 100 Equivalent Dihedral Angle panel break station 0 root wing V-dihedral 05 wing has polyhedral break middle wing panel dihedral ratio ratio between tip panel dihedral angle main panel dihedral angle ratio 1000 wing really three-panel wing flat center section Note differences efficiency very minor projected area true area ratio 0975 0974 0973 0972 0971 097 0969 0968 0967 0966 0965 [F1 T 1 panel dihedral ratio 1000 4 0 0 01 02 03 04 05 06 07 Figure 3rootPanel Break Location fraction semispan rate amount plane must yaw circling biity Less dihedral helps efficiency airplane straight flight dihedral helps efficiency air2 plane time rolling circling choice di*15hedralamountshould reflect thoughtful balance straightline performance 0809maneuvering consid tiperations time model spends transi tional maneuvers rolling maneuvers fairly bankedup circles dihedral model should have Also larger slower model important generous dihedral ma neuvers spiral stability New considerations Dihedral type affects flutter behavior flutter-prone wings Flutter may considered interac tion between wings bending twist ing oscillatory modes general anything will increase wing torsional oscil Polyhedral wings likely flutter V-dihedral wings Polyhedral wings depart torsional axis near panel break tip increases torsional mo ment inertia reduces torsional resonant frequency turn reduces flutter speed wing greater panel break angle greater problem will Heavy panel joints wing tips will also make problem worse should avoided lation frequency will push onset wing flutter higher speed obvious way to make wing rigid tor sionally such means D-tubes geo detic ribs other way draw mass wing towards torsional axis wing An example use lightweight trailing edge structure Polyhedral wings seen front view de part torsional axis wing especially near break near tip illustrated Figure 4 convert ing wing V-dihedral wing brought close possible torsional axis mimmizing its tendency flutter Another consideration may affect dihedral configuration presence wing joiners landing gear engine mounts some other substantial structure gen eral efficient unify structure much possible might nice stance attach landing gear already reinforced polyhedral joint might re quire departing optimum polyhe dral configuration have seen penalties mimmal Wing joints issue own Bending loads wing joints fall off sub stantially farther out wing joints may simplified lightened made away center wing other hand may want just joint instead two Also single joint centerline keeps extra weight near cen ter gravity doesnt hurt handling Recommendations Getting down specif ics non-aileron airplanes would adjust priorities according type plane designing Free Flight models must have spiral stability would make sure first let other aspects fol low fine points involved Free Flight models under stand refrain further comment Continued page 168 November 1988 105 099 oga 097 096 095 094 093 092 091 09 projected area true area ratio Figure 1 Figure 3 same plot shown Figure 2 except wings Equivalent Dihedral Angle 150 instead 100 Note spread efficiency about twice great 100 wing its still very small conclusion im portant optimize dihedral type wings have lots dihedral clear long extreme dihedral config urations avoided liffle gain straight-line efficiency standpoint using dihedral type rather another Choosing dihedral type amount Aircraft design compromise Choosing dihedral type amount prime exam ple dihedral amount affects effici ency plane straight flight roll PUI~1IJRUTY INGRED i AVLAl3LE * Superior Igniters Improve starting idle acceleration Youll notice power bargain fuels * Special Detergents Promote clean burning prevent residue buildup * Rust Inhibitors Protect engines corrosion After run oil needed engines * Film Strength Additives Increase lubricity provide extra * lean run protection Anti-Wear Additives Help keep engines running peak performance longer Satisfaction 2T U1 *Guaranteed FREE SHIPPING ON ORDERS OVER $1500 COLLECT PINTQUART GALLON55 GAL DRUM 0%Nitromethane$315$450$1075$19695 5%Nitromethane$365$525$1275$26495 10%Nitromethane$415$550$1475$32995 15%Nitromethane$430$635$1675$38995 25%Nitromethane$515$795$2195$52495 35%Nitromethane$595$925$2695$66995 4YROK 10% Nitromethane$1425$29995 15% Nitromethane$1625I$36495 L2WKE OF CHAMPtO CL RS over 20 years SIG has blending finest quality model engine fuel available using finest quality ingredients instance Methanol use 995% pure very best grade money can buy also use real 100% pure Nitromethane get full measure youve paid based honest percentage-of-volume method percentage weight SIG fuels con tain 50-50 blend Bakers purest AA Castor Oil new improved Klotz Techniplate Synthetic Racing Oil maximum engine lubrication protection Based experience sincerely believe finest quality fuel can made price dont take word try some judge yourselfPoces sobleot chnRe wthoot noto. See aealer first available order direct Call 800-247-5008 toll free orders Latest Catalog $300 MANUFACTURING CO Montezuma IA 50171 r Dihedral/Beron-Rawdon Continued page 105 RC Sailpianes thermal flying should simultaneously have spiral stability ade quate roll rate good transitional behavior good stall behavior circling presently feel requirements can met either generous V-dihedral generous polyhedral substantial wash out tip panels Long tail moment arms ample vertical stabilizers will provide ample control power transitional damp ing Specific numbers Absolute minimum FDA 100 much like 15 FDA Vertical tail moment arm 35% 45% wingspan Vertical tail area 5% 6% wing area Keep wing tips tail group light RC Sailplanes aerobatic flying need stress high roll rate good efficiency rolling ample control power damp ing application would use very generous four-panel polyhedral tip panels about three times main panel angle fairly long tail moment arm large vertical stabilizer will provide control power damping Instead four-panel wing would consider six panels just extreme about would use same num bers above except would use 150 200 FDA Rudder-and-elevator RC power planes training purposes must stress spiral sta bility Most power planes fly such high speeds adequate roll rate pro blem Spiral stability lower speeds can achieved ample dihedral long tail moment arm undersize vertical attempt achieve spiral stability will make plane track poorly Lack experience power planes prevents making specific recommendations believe rudder-and-elevator RC power planes sport aerobatics could lot fun Generous dihedral long tail mo ment arm large vertical stabilizer lots rudder throw could provide rapid roll rate immediate response Old-Timer models have characteris tics resurgence Old-Timer power models Radio Control may based partly maneuverability stability type model improvements wing sections structure such models could flown spirited fashion Future developments would nice see further work subject published model press good set experiments would actually measure roll rates few Sailplanes function span air speed yaw angle FDA would good project develop publish systems artificially providing spiral stability otherwise unstable air planes would boon lowdihedral aileron Sailplane current availability low cost rate gyroscopes Continued page 168 168 Model Aviation WINGS SCRATCH BUILDERS ! PRECISION CUT FOAM WING CORES WIDE VARIETY OF WING SPANS TAPERS AND SECTIONS TO CHOOSE FROM SEND $200 FOR BROCHURE FLIGHT COMPONENTS POBOX 39366 ST LOUIS MO 63139-8366 WINGS SCRATCH BUILDERS ! PRECISION CUT FOAM WING CORES WIDE VARIETY OF WING SPANS TAPERS AND SECTIONS TO CHOOSE FROM SEND $200 FOR BROCHURE FLIGHT COMPONENTS POBOX 39366 ST LOUIS MO 63139-8366 YES Please send me copies Radio Control Buyers Guide Price per copy $11 951#24626 check enclosed D Charge credit cardCharge D Mastercard D Visa Card # Exp date City State ZipSignature Include postage handling U S $1 foreign $150 Make payment U S funds Wisconsin residents add 5% sales tax0018 wrist allowing model fly full speed net stopped modelbut caught damage wondered several years whether net would stop Speed ship Now know Dihedral/Beron-Rawdon Continued page 168 might lead practical solution scheme might sense yaw rate drive ailerons might achieve same yaw-roll couple dihedral naturally provides hope series articles dihe dral has entertaining some prac tical use Nats Indoor Scale/Kruse Continued page 60 tries sad slate affairs may due aforementioned rule against entering same ship event Open Dave Rees wowed audience exceptionally good flying large Travelair 6000 built Coconut Scale rules DC Maxecuters club Coconut Scale among other things calls minimum wingspan 36 minimum weight ounce Daves big orange-and-black Travelair maxed easily flight centering itself under hanging score board Scope coming pictureperfect landings prop still ticking over Larry Kruse flew Don Srull-designed Santos Dumont 14-bis canard second place just 19 MaTCflOa ISu oystem forTOPPEMANCE K&B tNGINES AirplaneMahirte K&B FUELSK&B GLOW PLUGS 9 Bleeds4 Choices Matched Finish Syctom BEST APPEARANCE K&B FIBERGLASS CLOTH K&B Micro-BaIlnoOS FILLER K&B SUPER POXY RESIN K&B SUPER POSY THINNER K&B SUPER POXY PRIMER K&B SUPER FOXY PAINT K&B MIXING CUPS S points behind Rees Jim Miller third version Santos Dumont Several other models worthy note par ticularly beautiful 1912 Doppeltaube Paul Boyanowski As photo shows meticu lously constructed proved difficult trim its large surface area high induced drag Gina Boyanowski represented fairer sex quite well nicely built Piper Super Cub Walt Mooney plans Gina gained great deal experience trimming durable little red-and-white ship during contest Proving adapted well trial-and-error experi ence able coax fine flight over 60 seconds out plane before ran out of ficial attempts Scale judges Cliff Tacie Ron Sears Bob RainINTRODUCING TIlE O2O-E3S-ASO ELECTRIC SPAN 36 AREA 297 CHANNELS 2-5mm LENGTH 39 FLYING WS ZOSO 30 OZWW Designed built Electric Model Co 218 Oyster Ck r Land TX 77478 42-6229 Souths largest inventory sasro motors & accessories Need help yew electalc abnleae argUer Ask Doe November 1988 173 Now can own source book radio control modeling formation o Control Buyers Guide 300 pages thousands product listings all-new 12th Edition Ra dio Control Buyers Guide provides up-to-date information radio control enthusiast needs her youre beginner NATS champion Theres no other RIG book source like #24626 Aircraft Cars Boats 0 Radios 0 Systems nes Hardware Books S Videos Finishing materials Accessories R/C dealers Plus much Kaimbach Publishing Co 1027 N 7th St Milwaukee WI 53233-1 471 PRICE REDUCTION SALE five models speed controls employ latest MOSFET/HEXPET technology features fail safe timer shuts down motor event 01 transmitter receiver receiver battery failure CeeeisAm#hled ModelParis Kitaid TestedpaMOSFElS EKE24C$1950$2550$ 350$1250 EKE7R$2500$3100$ 350$1000 EXE7RM$2000$3200$ 35081800 EKE-24U$289$2800$1000$1200 EKE-FR$4000$5000$1000$249 EKE-FB43500$4500$1000$1500 EKE24U ade Kit order $ 500 RBO-0$1595$1996$ sIa oonwsrmnty repairs normally $1500 repair fee Plesas aend $200 postage sod handling per order Ales send SASE ioformelion aoaemhled speed controls carry ful 90 dsy earrardy Enclosures sod heel sinks alas sosilohle Mail ELDNeKEN ELECTRONICS INC PO Sex 1853 AzvadhCblorado 80001 call today30S 431-1328 Via lbsIe~capted pIus 4% Instantly removable sri-cycle gear wheels Pre-built boom landing geer sockets & push-rods Astro motor mount cobalt adapter Pre-formed leading edges knotched trailing edges Air frame 6cc 75 oz landing gear Perfect performance 020-035-35 systems Meximum duration & glider-like motor-off flight characteristics APP build & cover wing elan completely built tail surfaces hinged . $7896 wlo gear $8696 gear add $3 shipping TX rae add 6% sales taxI

NO OCR TEXT NO OCR TEXT gle proportional distance centerline airplane Figure 1 makes two main points First efficiency declines EDA increased Second parabolic wings efficient three types V-dihedral wings least ef ficient margin between wings very small Despite small size penalty di hedral performance loss we may well try min imize minimize loss means given EDA increase area mm imized key minimizing area putting dihedral effective place hand wing tip has best lever age wing good place put extra dihedral other hand though concentrate dihedral small area dihedral will have quite great As discussed above crease area increases rapidly crease dihedral concentration ap proach does pay off fact can least efficient way concentrated approach illustrated Figure 2 case line fol lowing labeled panel dihedral ra tio 1000 four-panel polyhedral wing has 1000 times much dihedral tip panel main panel main panel essentially flat wing has EDA 100 make main panel proportionately larger tip smaller tip has bend up farther farther time get panel break out 07 semi-span poor tip panel bent up 27 an see ef ficiency flat center panel wing falls off rapidly tip panel reduced less half semi-span Figures 2 3 show relative wing ef ficiency four types polyhedral wings Figure 2 wings 10 degrees EDA Figure 3 wings 15 de grees wing has four panels loca tion panel break varies cen terline airplane equivalent dihedral wing 90% way tip dihedral angle tip panel com pared main panel shown four ra tios 15 2 3 1000 15 ratio wing will look like slightly bent V dihedral wing 3 ratio wing classic polyhedral shape 1000 ratio wing really three-panel wing almost flat center panel Figures 2 3 show better distribute dihedral over entire wing dihedral nearer wing tip plots clear polyhedral wing panel break half way out wing tip-to-main dihedral ratio three efficient careful split hairs 100 EDA wings tal range efficiency ignoring threepanel wing 033% will alter du ration 15-minute still-air flight second range 150 EDA wings almost smallabout two sec onds 15-minute flight 104 Model Aviation straight-line pertormance penalty tor aineoral very small i ne reauction maxi mum glide ratio typical rudder elevator model about 1% compared equiva lent flat wing design 12 per side V-dihedral scheme authors Two Meter Tu tor shown good advantage Its V-dihedral chosen optimize circling abilities sim plify construction raise speed flutter occurs Also since two-piece wing relatively heavy joiner near CG its no detriment transitional maneuvers i ne tientie aay snows OTT tne very eiicieni iour-panei pciyneurw swiume usee ncr wing just over 14 Equivalent Dihedral Angle Gentle Lady displays blending good straight-line circling efficiency pleasant roll response sufficient spiral stability II Polyhedral V dihedral 051015 Equivalent Dihedral Angle degrees projected area true area ratio 099 0989 0988 0987 0986 0985 0984 0983 0982 0981 098 2025 Figure 2 ii-H 1111 I7Th-K j7 7t panel dihedral ratio 1000 0 01 02 03 04 05 06 rootPanel Break Location fraction semi-span 0708 09 tip Figure 1 Straight-line efficiency falls off proportionally increased dihedral effective prolected area wing diminished relative its actual surface area dihedral Increased profile drag increased wing profile drag fraction total drag sen sitivity dihedral angle very great Note both parabolic dihedral four-panel-polyhedral wings marginally ef ficient V-dihedral wing Figure 2 plot examines effect wing panel break location efficiency wing 100 Equivalent Dihedral Angle panel break station 0 root wing V-dihedral 05 wing has polyhedral break middle wing panel dihedral ratio ratio between tip panel dihedral angle main panel dihedral angle ratio 1000 wing really three-panel wing flat center section Note differences efficiency very minor projected area true area ratio 0975 0974 0973 0972 0971 097 0969 0968 0967 0966 0965 [F1 T 1 panel dihedral ratio 1000 4 0 0 01 02 03 04 05 06 07 Figure 3rootPanel Break Location fraction semispan rate amount plane must yaw circling biity Less dihedral helps efficiency airplane straight flight dihedral helps efficiency air2 plane time rolling circling choice di*15hedralamountshould reflect thoughtful balance straightline performance 0809maneuvering consid tiperations time model spends transi tional maneuvers rolling maneuvers fairly bankedup circles dihedral model should have Also larger slower model important generous dihedral ma neuvers spiral stability New considerations Dihedral type affects flutter behavior flutter-prone wings Flutter may considered interac tion between wings bending twist ing oscillatory modes general anything will increase wing torsional oscil Polyhedral wings likely flutter V-dihedral wings Polyhedral wings depart torsional axis near panel break tip increases torsional mo ment inertia reduces torsional resonant frequency turn reduces flutter speed wing greater panel break angle greater problem will Heavy panel joints wing tips will also make problem worse should avoided lation frequency will push onset wing flutter higher speed obvious way to make wing rigid tor sionally such means D-tubes geo detic ribs other way draw mass wing towards torsional axis wing An example use lightweight trailing edge structure Polyhedral wings seen front view de part torsional axis wing especially near break near tip illustrated Figure 4 convert ing wing V-dihedral wing brought close possible torsional axis mimmizing its tendency flutter Another consideration may affect dihedral configuration presence wing joiners landing gear engine mounts some other substantial structure gen eral efficient unify structure much possible might nice stance attach landing gear already reinforced polyhedral joint might re quire departing optimum polyhe dral configuration have seen penalties mimmal Wing joints issue own Bending loads wing joints fall off sub stantially farther out wing joints may simplified lightened made away center wing other hand may want just joint instead two Also single joint centerline keeps extra weight near cen ter gravity doesnt hurt handling Recommendations Getting down specif ics non-aileron airplanes would adjust priorities according type plane designing Free Flight models must have spiral stability would make sure first let other aspects fol low fine points involved Free Flight models under stand refrain further comment Continued page 168 November 1988 105 099 oga 097 096 095 094 093 092 091 09 projected area true area ratio Figure 1 Figure 3 same plot shown Figure 2 except wings Equivalent Dihedral Angle 150 instead 100 Note spread efficiency about twice great 100 wing its still very small conclusion im portant optimize dihedral type wings have lots dihedral clear long extreme dihedral config urations avoided liffle gain straight-line efficiency standpoint using dihedral type rather another Choosing dihedral type amount Aircraft design compromise Choosing dihedral type amount prime exam ple dihedral amount affects effici ency plane straight flight roll PUI~1IJRUTY INGRED i AVLAl3LE * Superior Igniters Improve starting idle acceleration Youll notice power bargain fuels * Special Detergents Promote clean burning prevent residue buildup * Rust Inhibitors Protect engines corrosion After run oil needed engines * Film Strength Additives Increase lubricity provide extra * lean run protection Anti-Wear Additives Help keep engines running peak performance longer Satisfaction 2T U1 *Guaranteed FREE SHIPPING ON ORDERS OVER $1500 COLLECT PINTQUART GALLON55 GAL DRUM 0%Nitromethane$315$450$1075$19695 5%Nitromethane$365$525$1275$26495 10%Nitromethane$415$550$1475$32995 15%Nitromethane$430$635$1675$38995 25%Nitromethane$515$795$2195$52495 35%Nitromethane$595$925$2695$66995 4YROK 10% Nitromethane$1425$29995 15% Nitromethane$1625I$36495 L2WKE OF CHAMPtO CL RS over 20 years SIG has blending finest quality model engine fuel available using finest quality ingredients instance Methanol use 995% pure very best grade money can buy also use real 100% pure Nitromethane get full measure youve paid based honest percentage-of-volume method percentage weight SIG fuels con tain 50-50 blend Bakers purest AA Castor Oil new improved Klotz Techniplate Synthetic Racing Oil maximum engine lubrication protection Based experience sincerely believe finest quality fuel can made price dont take word try some judge yourselfPoces sobleot chnRe wthoot noto. See aealer first available order direct Call 800-247-5008 toll free orders Latest Catalog $300 MANUFACTURING CO Montezuma IA 50171 r Dihedral/Beron-Rawdon Continued page 105 RC Sailpianes thermal flying should simultaneously have spiral stability ade quate roll rate good transitional behavior good stall behavior circling presently feel requirements can met either generous V-dihedral generous polyhedral substantial wash out tip panels Long tail moment arms ample vertical stabilizers will provide ample control power transitional damp ing Specific numbers Absolute minimum FDA 100 much like 15 FDA Vertical tail moment arm 35% 45% wingspan Vertical tail area 5% 6% wing area Keep wing tips tail group light RC Sailplanes aerobatic flying need stress high roll rate good efficiency rolling ample control power damp ing application would use very generous four-panel polyhedral tip panels about three times main panel angle fairly long tail moment arm large vertical stabilizer will provide control power damping Instead four-panel wing would consider six panels just extreme about would use same num bers above except would use 150 200 FDA Rudder-and-elevator RC power planes training purposes must stress spiral sta bility Most power planes fly such high speeds adequate roll rate pro blem Spiral stability lower speeds can achieved ample dihedral long tail moment arm undersize vertical attempt achieve spiral stability will make plane track poorly Lack experience power planes prevents making specific recommendations believe rudder-and-elevator RC power planes sport aerobatics could lot fun Generous dihedral long tail mo ment arm large vertical stabilizer lots rudder throw could provide rapid roll rate immediate response Old-Timer models have characteris tics resurgence Old-Timer power models Radio Control may based partly maneuverability stability type model improvements wing sections structure such models could flown spirited fashion Future developments would nice see further work subject published model press good set experiments would actually measure roll rates few Sailplanes function span air speed yaw angle FDA would good project develop publish systems artificially providing spiral stability otherwise unstable air planes would boon lowdihedral aileron Sailplane current availability low cost rate gyroscopes Continued page 168 168 Model Aviation WINGS SCRATCH BUILDERS ! PRECISION CUT FOAM WING CORES WIDE VARIETY OF WING SPANS TAPERS AND SECTIONS TO CHOOSE FROM SEND $200 FOR BROCHURE FLIGHT COMPONENTS POBOX 39366 ST LOUIS MO 63139-8366 WINGS SCRATCH BUILDERS ! PRECISION CUT FOAM WING CORES WIDE VARIETY OF WING SPANS TAPERS AND SECTIONS TO CHOOSE FROM SEND $200 FOR BROCHURE FLIGHT COMPONENTS POBOX 39366 ST LOUIS MO 63139-8366 YES Please send me copies Radio Control Buyers Guide Price per copy $11 951#24626 check enclosed D Charge credit cardCharge D Mastercard D Visa Card # Exp date City State ZipSignature Include postage handling U S $1 foreign $150 Make payment U S funds Wisconsin residents add 5% sales tax0018 wrist allowing model fly full speed net stopped modelbut caught damage wondered several years whether net would stop Speed ship Now know Dihedral/Beron-Rawdon Continued page 168 might lead practical solution scheme might sense yaw rate drive ailerons might achieve same yaw-roll couple dihedral naturally provides hope series articles dihe dral has entertaining some prac tical use Nats Indoor Scale/Kruse Continued page 60 tries sad slate affairs may due aforementioned rule against entering same ship event Open Dave Rees wowed audience exceptionally good flying large Travelair 6000 built Coconut Scale rules DC Maxecuters club Coconut Scale among other things calls minimum wingspan 36 minimum weight ounce Daves big orange-and-black Travelair maxed easily flight centering itself under hanging score board Scope coming pictureperfect landings prop still ticking over Larry Kruse flew Don Srull-designed Santos Dumont 14-bis canard second place just 19 MaTCflOa ISu oystem forTOPPEMANCE K&B tNGINES AirplaneMahirte K&B FUELSK&B GLOW PLUGS 9 Bleeds4 Choices Matched Finish Syctom BEST APPEARANCE K&B FIBERGLASS CLOTH K&B Micro-BaIlnoOS FILLER K&B SUPER POXY RESIN K&B SUPER POSY THINNER K&B SUPER POXY PRIMER K&B SUPER FOXY PAINT K&B MIXING CUPS S points behind Rees Jim Miller third version Santos Dumont Several other models worthy note par ticularly beautiful 1912 Doppeltaube Paul Boyanowski As photo shows meticu lously constructed proved difficult trim its large surface area high induced drag Gina Boyanowski represented fairer sex quite well nicely built Piper Super Cub Walt Mooney plans Gina gained great deal experience trimming durable little red-and-white ship during contest Proving adapted well trial-and-error experi ence able coax fine flight over 60 seconds out plane before ran out of ficial attempts Scale judges Cliff Tacie Ron Sears Bob RainINTRODUCING TIlE O2O-E3S-ASO ELECTRIC SPAN 36 AREA 297 CHANNELS 2-5mm LENGTH 39 FLYING WS ZOSO 30 OZWW Designed built Electric Model Co 218 Oyster Ck r Land TX 77478 42-6229 Souths largest inventory sasro motors & accessories Need help yew electalc abnleae argUer Ask Doe November 1988 173 Now can own source book radio control modeling formation o Control Buyers Guide 300 pages thousands product listings all-new 12th Edition Ra dio Control Buyers Guide provides up-to-date information radio control enthusiast needs her youre beginner NATS champion Theres no other RIG book source like #24626 Aircraft Cars Boats 0 Radios 0 Systems nes Hardware Books S Videos Finishing materials Accessories R/C dealers Plus much Kaimbach Publishing Co 1027 N 7th St Milwaukee WI 53233-1 471 PRICE REDUCTION SALE five models speed controls employ latest MOSFET/HEXPET technology features fail safe timer shuts down motor event 01 transmitter receiver receiver battery failure CeeeisAm#hled ModelParis Kitaid TestedpaMOSFElS EKE24C$1950$2550$ 350$1250 EKE7R$2500$3100$ 350$1000 EXE7RM$2000$3200$ 35081800 EKE-24U$289$2800$1000$1200 EKE-FR$4000$5000$1000$249 EKE-FB43500$4500$1000$1500 EKE24U ade Kit order $ 500 RBO-0$1595$1996$ sIa oonwsrmnty repairs normally $1500 repair fee Plesas aend $200 postage sod handling per order Ales send SASE ioformelion aoaemhled speed controls carry ful 90 dsy earrardy Enclosures sod heel sinks alas sosilohle Mail ELDNeKEN ELECTRONICS INC PO Sex 1853 AzvadhCblorado 80001 call today30S 431-1328 Via lbsIe~capted pIus 4% Instantly removable sri-cycle gear wheels Pre-built boom landing geer sockets & push-rods Astro motor mount cobalt adapter Pre-formed leading edges knotched trailing edges Air frame 6cc 75 oz landing gear Perfect performance 020-035-35 systems Meximum duration & glider-like motor-off flight characteristics APP build & cover wing elan completely built tail surfaces hinged . $7896 wlo gear $8696 gear add $3 shipping TX rae add 6% sales taxI