CONTROL LINE AEROBATICS havent written about trimming thought Id get very narrow subject can seriously affect other trim adjustments vertical center gravity CG think CC usually focus fore-and-aft CG does have big impact flight characteristics Having airplane vertical CG located line leadout exit will prevent achieving usual first step trim process leveling wings Before get too far Ill explain what Im considering airplane suspended leadouts displacement vertical CC line extension leadout exit intersects fuselage will force created will pull fuselage pull will attempt force vertical CC line leadouts model flying force working fuselage naturally affects wings displacement just little off wing cannot leveled properly As new airplane its good idea check vertical CC Its simple because things required way suspend masterpiece leadouts plumb bob idea look model hanging versus true vertical plumb bob line Somewhat surprisingly problem will show up quite vividly have decide CC what corrective action take important realize have fix problem have built popular design chances will ballpark constructed model according plans SV series Randy Smith calls centerline leadouts /s-inch below centerline tip rib Bill Werwage piped designs call leadouts similar relative position susceptible vertical CC problem pre-pipe era because lighter weight power systems although its still good idea check airplane Take situation looking front gear hangs down indicating CC below leadouts flight static weight would multiplied centrifugal force greatly accentuating offset circumstance forces inboard wing fly low wing true properly aligned dont recognize have vertical CC problem can wind up chasing impossible situation Ive done several times its no fun unusual situation lower portion model heavier bottom need think about fix situation have consider severity Before exploring necessity cut can lighten components Wheels big source weightespecially nicelooking commercial ones such Dave Brown brand very light wheels Tettra also favorite because beautiful turned aluminum hubs possible cut ounce Another area landing gear aluminum gear youre typically looking two ounces modem technology helpful supplier carbon replacement can get model nearly ounce lighter October1999 119 Jim Kosteckys Cutlass Classic-legal design early 1960s New version powered Aldrich-modified McCoy 40 Bill Werwage pull-tests Bob McDonalds smart originals Bear Bob Gieseke another Bear design lightweight 1997 F2B FAI CL Aerobatics team trials smallish roughly 650 sq 52 oz piped PA 60 youve dressed up airplane wheel pants have choice eliminating lightening Ive listed nearly three ounces can cut free right location Try time hopefully youll see fuselage lineup wingtip dont see improvement after incorporating possible option may have consider cutting wingtip lowering leadouts Some years ago modified 60 model pipe testbed good welltrimmed airplane served well after couple outings noticed making little tweaks account some rolling tendencies r its rubber-powered models youre looking call Peck-Polymers have full line kits supplies rubber-power/ well electric miniature R/C C02 Scale sport models ulI find ideas Peck-Polymers information send $400 catalog P0 Box 710399-MA w-uuuymesSantec CA 92072-0399 L Phone 619 448-1818Fax 619 488 1833PPModels@aolcom CHECK ITOH SREAL TIME ALL THE MEW TU o18volsneadId Mounts fuselage side cockpit easily seen place Plugs unused receiver channel Moving servos shows loaded battery voltage Helicopter version available enclosed plastic case 1it CkAIRPLANE VERSION $3995 HELIcoIrER VERSION $4495 You-p. VDLTAEi4C Products ~t 92,dTili OK 74133 53i5 c 915 492 9S7S Since concerned engine adjustments really subconscious thing recalling sessions never could get right Leveling wings did work because soon airplane tumed compensation became invalid result vertical CG problem recognized Ultimately cut tip get everything settled opposite circumstancewhen top airplane heavydoesnt happen very often does happen Sometimes occurs older airplanes have low wing centerlines relative thrustline characteristic shows topheavy fuselage inboard wing will tend fly high its upright same problem trimming out other correcting vertical CG Solving problem somewhat easier can increase weight wheels example Ive experienced problems Years ago built Aldrich AG-i Classic design has upswept wingtip showing leadouts exiting raised centerline thought since using adjustable leadouts Id bring leadouts out center wing after simple design low wing Did outsmart myself Looking back AG-is first flights behaved exactly high vertical CG should have got home hung model leadouts sure enough fuselage top hung down cut tip moved leadouts upinstant airplane same reaction airplanes have vertical CG repositioned correctly Thats quick tour through another factor making creations perform properly its correct dont have problems its youll know big-time Wind big factor flying model pilots usually guess velocity almost always overestimate Through years Ive several devices measuring wind have satisfactory couple years ago saw Bob Gialdini using measuring instrument Vintage Stunt Championships curious said used went sailing forgot about conversation wife conspired Bob instruments materialized Ive using regularly last year thought Id share source model Speedtech Instruments handles various types portable self-powered electronic instruments use Skywatch 3-D Model SW-3 Its solar-powered provides hands-free omnidirectional 5% accuracy Its reliable trouble-free easy use recommend highly several other types may prefer Contact Speedtech copy its current catalog Ive talked people very helpful knowledgeable modelers particular needs Speedtech located 10413 Deerfoot Dr Great Falls VA 22066 Order 800 760-0004 Fax 703 759-0509 Web site wwwspeedtechcom Model Aviation LANE FACTORY INC 1135 FLORIDA MANDEVILLE LA 70448 NEW AT THIS want gentle sport plane need KOMBAT 40 BASIC TRAINER spend days weeks months building trainer just see SMASHED TO SMITHEREENS learning Fly hourl Everything except radio engine box No Gluing No Covering No Sanding No Tears CRASH required 40146 size engine four channel radio big 60 wing span tricycle gear weighing 5-1/2 pounds BASIC TRAINER easy land can take some real punishment Most crashes usually result just couple broken nylon bolts can easily replaced minutes keep flying hoursl Available Red Yellow Orange Blue Order todayl Sport model KOMBAT 40 available $7495 VISA/MCIAMEX/COD 1-800-264-7840 FREE CATALOG 504 626-7840 Engines BASIC TRAINER $8495 $595 P&HI
Edition: Model Aviation - 1999/10
Page Numbers: 119, 120
Edition: Model Aviation - 1999/10
Page Numbers: 119, 120
CONTROL LINE AEROBATICS havent written about trimming thought Id get very narrow subject can seriously affect other trim adjustments vertical center gravity CG think CC usually focus fore-and-aft CG does have big impact flight characteristics Having airplane vertical CG located line leadout exit will prevent achieving usual first step trim process leveling wings Before get too far Ill explain what Im considering airplane suspended leadouts displacement vertical CC line extension leadout exit intersects fuselage will force created will pull fuselage pull will attempt force vertical CC line leadouts model flying force working fuselage naturally affects wings displacement just little off wing cannot leveled properly As new airplane its good idea check vertical CC Its simple because things required way suspend masterpiece leadouts plumb bob idea look model hanging versus true vertical plumb bob line Somewhat surprisingly problem will show up quite vividly have decide CC what corrective action take important realize have fix problem have built popular design chances will ballpark constructed model according plans SV series Randy Smith calls centerline leadouts /s-inch below centerline tip rib Bill Werwage piped designs call leadouts similar relative position susceptible vertical CC problem pre-pipe era because lighter weight power systems although its still good idea check airplane Take situation looking front gear hangs down indicating CC below leadouts flight static weight would multiplied centrifugal force greatly accentuating offset circumstance forces inboard wing fly low wing true properly aligned dont recognize have vertical CC problem can wind up chasing impossible situation Ive done several times its no fun unusual situation lower portion model heavier bottom need think about fix situation have consider severity Before exploring necessity cut can lighten components Wheels big source weightespecially nicelooking commercial ones such Dave Brown brand very light wheels Tettra also favorite because beautiful turned aluminum hubs possible cut ounce Another area landing gear aluminum gear youre typically looking two ounces modem technology helpful supplier carbon replacement can get model nearly ounce lighter October1999 119 Jim Kosteckys Cutlass Classic-legal design early 1960s New version powered Aldrich-modified McCoy 40 Bill Werwage pull-tests Bob McDonalds smart originals Bear Bob Gieseke another Bear design lightweight 1997 F2B FAI CL Aerobatics team trials smallish roughly 650 sq 52 oz piped PA 60 youve dressed up airplane wheel pants have choice eliminating lightening Ive listed nearly three ounces can cut free right location Try time hopefully youll see fuselage lineup wingtip dont see improvement after incorporating possible option may have consider cutting wingtip lowering leadouts Some years ago modified 60 model pipe testbed good welltrimmed airplane served well after couple outings noticed making little tweaks account some rolling tendencies r its rubber-powered models youre looking call Peck-Polymers have full line kits supplies rubber-power/ well electric miniature R/C C02 Scale sport models ulI find ideas Peck-Polymers information send $400 catalog P0 Box 710399-MA w-uuuymesSantec CA 92072-0399 L Phone 619 448-1818Fax 619 488 1833PPModels@aolcom CHECK ITOH SREAL TIME ALL THE MEW TU o18volsneadId Mounts fuselage side cockpit easily seen place Plugs unused receiver channel Moving servos shows loaded battery voltage Helicopter version available enclosed plastic case 1it CkAIRPLANE VERSION $3995 HELIcoIrER VERSION $4495 You-p. VDLTAEi4C Products ~t 92,dTili OK 74133 53i5 c 915 492 9S7S Since concerned engine adjustments really subconscious thing recalling sessions never could get right Leveling wings did work because soon airplane tumed compensation became invalid result vertical CG problem recognized Ultimately cut tip get everything settled opposite circumstancewhen top airplane heavydoesnt happen very often does happen Sometimes occurs older airplanes have low wing centerlines relative thrustline characteristic shows topheavy fuselage inboard wing will tend fly high its upright same problem trimming out other correcting vertical CG Solving problem somewhat easier can increase weight wheels example Ive experienced problems Years ago built Aldrich AG-i Classic design has upswept wingtip showing leadouts exiting raised centerline thought since using adjustable leadouts Id bring leadouts out center wing after simple design low wing Did outsmart myself Looking back AG-is first flights behaved exactly high vertical CG should have got home hung model leadouts sure enough fuselage top hung down cut tip moved leadouts upinstant airplane same reaction airplanes have vertical CG repositioned correctly Thats quick tour through another factor making creations perform properly its correct dont have problems its youll know big-time Wind big factor flying model pilots usually guess velocity almost always overestimate Through years Ive several devices measuring wind have satisfactory couple years ago saw Bob Gialdini using measuring instrument Vintage Stunt Championships curious said used went sailing forgot about conversation wife conspired Bob instruments materialized Ive using regularly last year thought Id share source model Speedtech Instruments handles various types portable self-powered electronic instruments use Skywatch 3-D Model SW-3 Its solar-powered provides hands-free omnidirectional 5% accuracy Its reliable trouble-free easy use recommend highly several other types may prefer Contact Speedtech copy its current catalog Ive talked people very helpful knowledgeable modelers particular needs Speedtech located 10413 Deerfoot Dr Great Falls VA 22066 Order 800 760-0004 Fax 703 759-0509 Web site wwwspeedtechcom Model Aviation LANE FACTORY INC 1135 FLORIDA MANDEVILLE LA 70448 NEW AT THIS want gentle sport plane need KOMBAT 40 BASIC TRAINER spend days weeks months building trainer just see SMASHED TO SMITHEREENS learning Fly hourl Everything except radio engine box No Gluing No Covering No Sanding No Tears CRASH required 40146 size engine four channel radio big 60 wing span tricycle gear weighing 5-1/2 pounds BASIC TRAINER easy land can take some real punishment Most crashes usually result just couple broken nylon bolts can easily replaced minutes keep flying hoursl Available Red Yellow Orange Blue Order todayl Sport model KOMBAT 40 available $7495 VISA/MCIAMEX/COD 1-800-264-7840 FREE CATALOG 504 626-7840 Engines BASIC TRAINER $8495 $595 P&HI
