RADIO CONTROL PYLON RACING DO YOU WANT TO RACE types competition satisfy urge club events FAJ Federation Aeronautique Internationale novice racer networking experienced competitors important find out what events held area within travel distance attend race Keep mind event increases difficulty cost distance must travel contest increases goal Giant Scale Formula start Quickie-based event learn fundamentals low cost learning curve Pylon Racing easy start becomes challenging speeds increase Find comfort level learn new skills achieve goal objective column provide wide variety information demystify speed secrets develop growing racing community speed enough although helps flying ability someone race Most successful racers did get alone Pylon Racing team sport Since elements racing speed Ill examine design features airframes some designs better others Popularity design often has campaigns successfully good design wins often because people fly main design criterion racing ain2raft drag reduction especially true formula events restrictions engine size specified design aspects airplane fixed amount delivered horsepower drag determines speed flight problem compounded need transfer engines power thrust propeller prop Prop selection makes breaks power transfer several conflicting goals optimized Ill examine another time First must define two types drag airplanesparasite induced Parasite drag consists skin friction moving air interference drag junctions between wing fuselage tail etc up designer develop clean airframe method reducing skin friction reduce surface area area wing usually fixed event formula often fuselage tail surface can changed reduce surface drag sailplanes designed pod boom pod can achieve nearly laminar flow low drag turbulent flow boom affects diminished surface area basic concept can adapted Quickies Another way lower drag basic box fuselage move widest part fuselage back trailing edge wing helps prevent separation interference drag between wing fuselage gives effect wing fillet having Fig 1 notice fuselage expands nose trailing edge promotes laminar flow Behind wing fuselage bows inward rather expected curve outward pressure-recovery area its shaped similar NACA National Advisory Committee Aeronautics duct shape Figure 1can help recover some turbulent energy giving thrust reduce surface area close look Jon Sharps full-scale Formula Nemesis reveals both features online check out three-view http/wwwddgcomlNemesis/ also helps wing middle oval fuselage high rectangular fuselage nearly case worst location wing low People point out WW II fighters low-wing airplanes reason pilot health less important see what below what above attack position However Mustang nearly midwing airframe designers clever enough achieve very low drag placement radiator belly pod Note location wings leading edge less important trailing edge fuselage trailing edge Mustang continues smoothly down 15 feet before curving under preventing downwash wing spilling under fuselage thus decreasing lift increasing drag Fig 2 common mistake designers Mustang-type models Q-40 racing cross-section have Mustang profile achieve height measurement Figure 3the cross-section does prevent wings downwash breaking under fuselage CZtrailing edge full-scale Mustang shaped like left section Fig 3 Q-40 Mustangs similar section left happens wing acts two short wing panels two wingtips As will see wingspan critical Pylon Racing Another design ennr having two surfaces meet less 900 angle see often V-tailed Quickies landing gear low wing airplanes tall ____________________________________________ left Fig 4 will have much greater drag becanse interference the right subject parasite drag allows designers much opportunity improve airframes question air moves past airplane important just big cross-section Induced drag caused generation lift influenced span weight balance Span weight squared terms drag formulas Although familiar wing loading span loading better measurement racing years Formula models wingspans around 50 inches Ten years ago modified Stinger late Don Rice span 58 inches lowered induced drag about 25% compared 50inch wing Although does change speed much level flight makes huge difference drag turns Pylon Racer spends 30% race turns generating 2540 times models weight lift gravity g loading depends tight aim 50- 75-foot radius 170 mph longer wing airplane would slow down much turns shortwing airplanesa great advantage until others did same change improved Formula airplanes 6-7% next contributor induced drag trim balance airplane conventional aircraft aft tail static stability maintained balance point center gravity [CO] ahead center lift stable depends upon distance ahead percentage wing chord problem center lift moves slightly airspeed CG fuel bum Since landings need equal takeoffs models typically balanced tank dry thing missing order balance equation force tail pulling down fly level As airplanes CG moved forward tails down force must increase Fig 5 4-pound model -inch positive stability tank dry 20Figure 5inch moment tail down force 08 ounce center 6-ounce tank located 6 inches ahead dry CG airplanes CG moves ahead -inch increases tails down force 26 ounces doesnt sound like much kicker down force must offset increased lift wing April 1998 93 Aveox Sweeps Electric NATS F7 LMR motor took top 8 places Class LMR Sail p lane Congratulations David Elias Class B Aveox took 6 top 7 places including first p lace tie Both 3 points perfect George Joy won Class B flyoft using F7LMR motor 12 cells Call write fax e-mail us tor FREE catalog Shown new FlU Competition model new lightened version weighs 21 5g wires capable nearly 1 horsepower used 10 cell F5B competition also worlds powerful 7 cell motor used new Hybridrive L60 controller can get over 700 watts 96 ounce package Aveox Inc 31324 Via Colinas #103 Westake Village CA 91362 Phone 818597891 185970617 httpllwwwaveoxcom info@aveoxcom Aveox High Performance Brushoss DC Motors LIUII 10] 4K IP SPCIALISTS IN COX AND AME ENGINES & CUSTOM PARTS COMPETITION ACCCESSORIES RACING WHEELS SOLID LINES CUSTOM NEEDLE VALVES OLD TIMER KITS & SUPPLIES COILS CONDENSERS PLUGS SILK QUALITY DOPE BRUSHES TRANSISTOR IGNITION SYSTEMS 1I2A TEXACO PLAYBOY SR KIT PH 760-761-0511 FAX 761-0937 VISA IMC WELCOME NO COD MINIMUM ORDER $1000 PLUS $300 SHIPPING INSURANCE $200 Model Leeth lel SleePrice 1RF770 13 005 3/164121/4Gas I52557 iL3tuaz L itL2 J instead supporting 70 ounces actual weight lifting 726 ounces problem increases turns 3Ogs wing loading 49 pounds per square foot solution balance far back possible keep tank close center gravity engine allows set elevator very small throw Generally its best start new airplane set up nose-heavy considerable amount elevator throw relative term 40-size racing airplane because throw allows enough control overcome slight alignment problems incidence construction Once controls trimmed out flight move CG back until measured elevator trailing edge tight turn last contributor induced drag wing dihedral Fig 6 intentional because wing bending under load both cases wing I#4 Figure 6 panel generating lift canceled out other panel maintain turning radius lift required thus drag rage NMPRA Championship Race will appear upcoming issue Model viation Per Sport Racing Free-Flight Electrics 4 Diameter Replaceable D-Risg Tire Less 1 per Pair l Axles Available Gas dyed year choice color Choice Trae Chreme Plating Improved Porting Timing Dptions Sizes Fit Moat YS D5 Engines tram 45 tu 1 Ot tor Yoir Application Serious Horsepower ipgrade tar Sport Engines Up 1500 RPM Increase Dyer Stock Muffler Naw available 00 size ls fit CS 32 Webra 32 ST G 34 DS 40/40 SF DS 40 FX ASP 45 Magnum XL 4t/4t/53 Thunder Tiger Pro 40/45 ST GS 40/45/51 webra 40/Si MWS 40 Roooi 40/45/53 Complete Engine/Muffler Combos Available Yonr Application Engine Included Ultra Oil Preservative After-Run DII tar Model tegines Pally Compatible OSIYS Pump Systems Helps Prevent Ruot & Corrosion Dthers Have Failed lable 3 Convenievi Sizes 0 ez Duart Gallon Pylon Racing Parts & Accessories uper Tiger YS Repair Service Send $300 1998 Catalog Dealer Inqutnes Welcome PERFORMANCE SPECIALTIES P 0 Box 3146 nerville NV 89410 e 702-265-7523 702-265-7522 94 Model Aviation gear solution Need 12 them9 fl1i L UL4 Please support year hobby seen Direct add $300 S&H IUSA Fults Tooling P0 Boo 155 Savoy IL 61074 Champions Worlds Finest & Fastest Racing Engines have trophies prove Versions Sport & Competition Av Sizes 15 50 Only Way eackplate Mounting System CNC earstock Aleminum aceo Stock eackplste C-Ring Seal roublesome Gaskets lable ST 40/45/51 Rossi 40/45 Webni 40/Si CS 40/40 SF YS 45 Thunder Tiger Pro 40/40/53 Magnum XL 40/40/53
Edition: Model Aviation - 1998/04
Page Numbers: 93, 94
Edition: Model Aviation - 1998/04
Page Numbers: 93, 94
RADIO CONTROL PYLON RACING DO YOU WANT TO RACE types competition satisfy urge club events FAJ Federation Aeronautique Internationale novice racer networking experienced competitors important find out what events held area within travel distance attend race Keep mind event increases difficulty cost distance must travel contest increases goal Giant Scale Formula start Quickie-based event learn fundamentals low cost learning curve Pylon Racing easy start becomes challenging speeds increase Find comfort level learn new skills achieve goal objective column provide wide variety information demystify speed secrets develop growing racing community speed enough although helps flying ability someone race Most successful racers did get alone Pylon Racing team sport Since elements racing speed Ill examine design features airframes some designs better others Popularity design often has campaigns successfully good design wins often because people fly main design criterion racing ain2raft drag reduction especially true formula events restrictions engine size specified design aspects airplane fixed amount delivered horsepower drag determines speed flight problem compounded need transfer engines power thrust propeller prop Prop selection makes breaks power transfer several conflicting goals optimized Ill examine another time First must define two types drag airplanesparasite induced Parasite drag consists skin friction moving air interference drag junctions between wing fuselage tail etc up designer develop clean airframe method reducing skin friction reduce surface area area wing usually fixed event formula often fuselage tail surface can changed reduce surface drag sailplanes designed pod boom pod can achieve nearly laminar flow low drag turbulent flow boom affects diminished surface area basic concept can adapted Quickies Another way lower drag basic box fuselage move widest part fuselage back trailing edge wing helps prevent separation interference drag between wing fuselage gives effect wing fillet having Fig 1 notice fuselage expands nose trailing edge promotes laminar flow Behind wing fuselage bows inward rather expected curve outward pressure-recovery area its shaped similar NACA National Advisory Committee Aeronautics duct shape Figure 1can help recover some turbulent energy giving thrust reduce surface area close look Jon Sharps full-scale Formula Nemesis reveals both features online check out three-view http/wwwddgcomlNemesis/ also helps wing middle oval fuselage high rectangular fuselage nearly case worst location wing low People point out WW II fighters low-wing airplanes reason pilot health less important see what below what above attack position However Mustang nearly midwing airframe designers clever enough achieve very low drag placement radiator belly pod Note location wings leading edge less important trailing edge fuselage trailing edge Mustang continues smoothly down 15 feet before curving under preventing downwash wing spilling under fuselage thus decreasing lift increasing drag Fig 2 common mistake designers Mustang-type models Q-40 racing cross-section have Mustang profile achieve height measurement Figure 3the cross-section does prevent wings downwash breaking under fuselage CZtrailing edge full-scale Mustang shaped like left section Fig 3 Q-40 Mustangs similar section left happens wing acts two short wing panels two wingtips As will see wingspan critical Pylon Racing Another design ennr having two surfaces meet less 900 angle see often V-tailed Quickies landing gear low wing airplanes tall ____________________________________________ left Fig 4 will have much greater drag becanse interference the right subject parasite drag allows designers much opportunity improve airframes question air moves past airplane important just big cross-section Induced drag caused generation lift influenced span weight balance Span weight squared terms drag formulas Although familiar wing loading span loading better measurement racing years Formula models wingspans around 50 inches Ten years ago modified Stinger late Don Rice span 58 inches lowered induced drag about 25% compared 50inch wing Although does change speed much level flight makes huge difference drag turns Pylon Racer spends 30% race turns generating 2540 times models weight lift gravity g loading depends tight aim 50- 75-foot radius 170 mph longer wing airplane would slow down much turns shortwing airplanesa great advantage until others did same change improved Formula airplanes 6-7% next contributor induced drag trim balance airplane conventional aircraft aft tail static stability maintained balance point center gravity [CO] ahead center lift stable depends upon distance ahead percentage wing chord problem center lift moves slightly airspeed CG fuel bum Since landings need equal takeoffs models typically balanced tank dry thing missing order balance equation force tail pulling down fly level As airplanes CG moved forward tails down force must increase Fig 5 4-pound model -inch positive stability tank dry 20Figure 5inch moment tail down force 08 ounce center 6-ounce tank located 6 inches ahead dry CG airplanes CG moves ahead -inch increases tails down force 26 ounces doesnt sound like much kicker down force must offset increased lift wing April 1998 93 Aveox Sweeps Electric NATS F7 LMR motor took top 8 places Class LMR Sail p lane Congratulations David Elias Class B Aveox took 6 top 7 places including first p lace tie Both 3 points perfect George Joy won Class B flyoft using F7LMR motor 12 cells Call write fax e-mail us tor FREE catalog Shown new FlU Competition model new lightened version weighs 21 5g wires capable nearly 1 horsepower used 10 cell F5B competition also worlds powerful 7 cell motor used new Hybridrive L60 controller can get over 700 watts 96 ounce package Aveox Inc 31324 Via Colinas #103 Westake Village CA 91362 Phone 818597891 185970617 httpllwwwaveoxcom info@aveoxcom Aveox High Performance Brushoss DC Motors LIUII 10] 4K IP SPCIALISTS IN COX AND AME ENGINES & CUSTOM PARTS COMPETITION ACCCESSORIES RACING WHEELS SOLID LINES CUSTOM NEEDLE VALVES OLD TIMER KITS & SUPPLIES COILS CONDENSERS PLUGS SILK QUALITY DOPE BRUSHES TRANSISTOR IGNITION SYSTEMS 1I2A TEXACO PLAYBOY SR KIT PH 760-761-0511 FAX 761-0937 VISA IMC WELCOME NO COD MINIMUM ORDER $1000 PLUS $300 SHIPPING INSURANCE $200 Model Leeth lel SleePrice 1RF770 13 005 3/164121/4Gas I52557 iL3tuaz L itL2 J instead supporting 70 ounces actual weight lifting 726 ounces problem increases turns 3Ogs wing loading 49 pounds per square foot solution balance far back possible keep tank close center gravity engine allows set elevator very small throw Generally its best start new airplane set up nose-heavy considerable amount elevator throw relative term 40-size racing airplane because throw allows enough control overcome slight alignment problems incidence construction Once controls trimmed out flight move CG back until measured elevator trailing edge tight turn last contributor induced drag wing dihedral Fig 6 intentional because wing bending under load both cases wing I#4 Figure 6 panel generating lift canceled out other panel maintain turning radius lift required thus drag rage NMPRA Championship Race will appear upcoming issue Model viation Per Sport Racing Free-Flight Electrics 4 Diameter Replaceable D-Risg Tire Less 1 per Pair l Axles Available Gas dyed year choice color Choice Trae Chreme Plating Improved Porting Timing Dptions Sizes Fit Moat YS D5 Engines tram 45 tu 1 Ot tor Yoir Application Serious Horsepower ipgrade tar Sport Engines Up 1500 RPM Increase Dyer Stock Muffler Naw available 00 size ls fit CS 32 Webra 32 ST G 34 DS 40/40 SF DS 40 FX ASP 45 Magnum XL 4t/4t/53 Thunder Tiger Pro 40/45 ST GS 40/45/51 webra 40/Si MWS 40 Roooi 40/45/53 Complete Engine/Muffler Combos Available Yonr Application Engine Included Ultra Oil Preservative After-Run DII tar Model tegines Pally Compatible OSIYS Pump Systems Helps Prevent Ruot & Corrosion Dthers Have Failed lable 3 Convenievi Sizes 0 ez Duart Gallon Pylon Racing Parts & Accessories uper Tiger YS Repair Service Send $300 1998 Catalog Dealer Inqutnes Welcome PERFORMANCE SPECIALTIES P 0 Box 3146 nerville NV 89410 e 702-265-7523 702-265-7522 94 Model Aviation gear solution Need 12 them9 fl1i L UL4 Please support year hobby seen Direct add $300 S&H IUSA Fults Tooling P0 Boo 155 Savoy IL 61074 Champions Worlds Finest & Fastest Racing Engines have trophies prove Versions Sport & Competition Av Sizes 15 50 Only Way eackplate Mounting System CNC earstock Aleminum aceo Stock eackplste C-Ring Seal roublesome Gaskets lable ST 40/45/51 Rossi 40/45 Webni 40/Si CS 40/40 SF YS 45 Thunder Tiger Pro 40/40/53 Magnum XL 40/40/53
