MY January February 1979 columns dealing CL Scale basics have drawn best response Ive done far Its obvious need continue direction shed some light areas tend taken granted Well start month looking recent letter Ill put comments suggestions go Chris Genna Astoria Oregon wrote am what might call novice modeler havent competed event yet Im leaning toward scale main interest So delighted see article JanuaryMA aboutconvertingRC scale kits CL get ready take what consider first step toward scale have some questions about particular situation Ive got House Balsa YzA FW-190.. dont think plane suitable throttle least iT 049 05 1 plan skip lot detailing want thing fly well possible Sunday sport flying yet look like prototype air craft. ontemplating entering plane stand-way-oft scale event tions Does what said about powerthat engine size stated box okayapply kits small Some flying buddies think Ill need oomph like perhaps 09 dont know what base just gut reaction guess Reply Since Ive never built House Balsa FW-190 cant predict exactly will perform control lines can give own gut reactions would go about ff1 shoes Its interesting project some exciting possibilities Kept extremely light weight no throttle extra detailing may end up CL version Peanut Scale would lean towards strong light engine like Cox TD 051 09 fact TD 09 about lightest engine its size know might best choice Dont too concerned about needing extra power overcome drag full-bodied fuselage Guys often make mistake assuming full-bodied scale model will have lot drag slim profile type lot cases Continued page 110 GOOD FOR WHERE NO C Ir Drawing No 2 order CL Scale moaci fly wings level put leadouts correct relationship models CG Some examples shown fliers have wondered otherwise delightful airplanesCub AT-6 saydont groovesketches make clmr 38 Model Aviation Well-built sport-scale Stearman PT-i 7 David Brandert Fremont NE Fox 59 power G-S 3-line control system Sig silk dope finish Drawing No 1 poin airpiane about wnmcn can pertectly balanced CGthe center aircraws total weight Text explains its importanca control sys tem installation CL Scala wish locate exact location CG suspend plane two different canter-line points extend lines intersectionthe CGI say CG found properly located unless plane has balanced C/L Flyer SAFELOK LAUNCHER FEATURES plated 1/8 steel support member plated 3/32 manganese bronze moving parts 050 X aluminum anchor strap simple anchoring stake turf spike asphalt screw eye-bolt 6-32 T nut furnished board mounting 25 lb capacity will pull apart 125 Ibs spring biased restraint arm thrown open position release $495 pp USA WRITE ST CLAIR MODEL COMPONENTS P0 Box 5626 Eugene OR 97405 WHY PAY MORE big buy high performance *FIREBALL #H30 HOT 3 volts faster starts #S20 STANDARD 24 volts general use #C15 COOL 15 volts cures pre-ignifion ust fun stick FIRE BALL great engine runs * advanced98 FLASH STARTING0 UNEXCELLED POWEP LONGER LIFE0 LOWEST DRAIN GLOW PLUGS SWANSON ASSOCIATES P0 BOX 161WAYNE NEW JEMEY 07470 However use fixtures shown Reset Fixtures drawing designed Frank Garzon seldom lose piston Place aluminum anvil plug 1 X 1 anvil step facing upward assembly placed rigid flat surface insert piston face down against plug Place modified Kim tool against ball socket maintaining pressure As start hammer rotate tool frequently checking often bind rod piston socket Burrs will raised socket Kim tool Use Dremel tool deburring clean piston thoroughly soap water have lost cylinder hard burrs broke free 12 Running youre still reading exhausted Tam well conclude paragraph High-nitro fuels should used new Cox engine use K&B 100 Cox Gray 6/3 prop cut flat across tips aS dia break-in good engine after 1/2 hour running should tech 20 22000 rpm prop fuel open face pipe adapter Some fuel should evidence around first end during running signifying good shaft case fit adequate lubrication pipe speeds lubrication critical 70% nitro fuels 25 27000rpm prop indicative good performance pipe adapter usually add 2 3000 rpm ground rush break-in stage have seen tach changes 1 2000 rpm time accumulated engine Try different pistons particularly worn ones against tach improved results aforementioned rpm have initially attained SERVICES/MATERIALS 1 Cox Blank Cylinder Barrels Jack Fraher 3900 Greystone Ave Riverdale NY 10463 Tel 2125491743 2 Schnuerle Porting Service Pipe Adapter Mike Langlois 2408 west Cornwallis Dr Greensboro NC 27408 Tel 919288 5900 3 Pipe Adapters Dub Jett 4720 Aslibrook Dallas TX 75227 4 Shaft Chrome Cylinder/Case Hoain Machine work Gene Hempel 302 North Yale Dr Garland TX 75042 Tel 2142725210 5 For Information Nick Sher 815 Beech Rd Lassghorne PA 19047 Tel 2157575373 61/2 Parts Kaxtom Kraftsmassship PO Box 2699 Laguna Hills CA 92653 Gene Hempel 302 North Yale Dr Gar land TX 75042 CL Scale/Gretz continued page 38 dirty proffle model pushrods engine tank etc hanging out over place would have much drag scale model Just remember increased scale cross-section frontal area wont afitect models performance great extent unless accompanied increase weight Look fullscale Gee Bee racers relied smooth contours overcome huge frontal area Wing Loading meaning weight wing area ratio Power Loading weight thrust ratio keys good flight performance Wing Loading par ticular real difference between CL stunt CL scale model much drag frontal area Al Rabes well known stunt models good recent example So keep Focke-Wulf light aero-dynamically clean pos sible sure use braided steel control lines opposed dacron lines minimum drag Back Chris Would desirable stunting point view eliminate some three inches dihedral plans call know would remove lot scale appearance might flatter wing improve control line flying begier. Could should RC aile rons completed CL flaps Reply would check some photos three-view drawing use scale amount dihedral House Balsa may have increased dihedral RC flight Again can look some Al Rabes stunt models recent proof dihedral itself doesnt hinder stunting ability wing removable model Chris wouldnt make way Building wing model could save little weight access inside fuse isnt important RC version Likewise removable hatches other engine cowl would build too Remember light weight important hope stunt scale model problem using RC ailerons CL stunt type flaps fact area near wing tips could cause rocking motion range movement too extreme Never theless would definitely try using ailerons stunt flaps model type purpose would limit travel about vator travel starters other words maximum elevator 450 have about 15 flaps slight flap movement shouldnt cause trouble may extra edge need enable model some basic aerobatics Chris question about dihedral brings up something didnt have room talk about January column Most can grasp aircraft has fore aft balance point often mis takenly referred Center Gravity CG Actually Center Gravity refers See Drawing No 1 point airplane regardless airplanes attitude about can perfectly balanced point center aircrafts total weight Center Gravity includes fore aft balance point well balance points along aircrafts other axes 110 Model Aviation movements airplane flight pitch roll yaw revolve around Center Gravity simplest terms flying CL model tethering full-fledged aircraft circle around Naturally would ideally want hookup right aircrafts CG try actual practice normally sweep leadouts back wingtip just slightly CG compensate extra drag control lines discussed January column locate top view wing plan leadouts fore aft location tip relation models CG way average chord didnt get question leadouts vertical location end wing its relationship CG start can imagine what would happen hooked control lines up models nose tail wouldnt fly very well say least Well same would true although extreme hookup too high too low verticallylike say top canopy bottom landing gear leadouts near end wing should approximately line height-wise Center Gravity Drawing No 2 shows some basic exam ples different configurations aircraft dont know precise way find before model built exactly CG going vertically get models leadouts ballpark should cruise naturally level flight about shoulder height wings per fectly level ground need aileron deflection However its good idea make ailerons model movable just case Murphys Law #1 can happen will should come play will look much scale-like hinged can adjusted necessary after test flying compensate tendency wing fly higher lower other level flight Mike Gretz Box 162 Montezuma IA 501 71 CL Navy Carrier/Perry continued page 39 practice learn characteristics model engine perfect smooth throttle technique Balance practice good throttle tech nique important factors good low speed Neither Ron nor use moveable leadouts 20-mph flights pose no prob lems Ron uses ailerons about half Class Class II fliers side other half dont use aileronsits simpler think wing-tip weight effective ailerons maintaining line tension under flight conditions simply matter personal preference further problem often encountered low-speed flight oscillation roll near stall Rog Edwards Albuquerque New Mexico have both found washing out wing tips twisting tip leading edge down two three degrees can help solve oscillation problem Smooth throttle technique also seems help technique have found work very well Class Class II models set engine thrust line horizon tal stabilizer level zero incidence set wing root two degrees positive incidence measured leading edge trailing edge along bottom airfoil two-degree washout puts wing tips zero incidence results very light loading tips during highspeed flight seems improve elevator effectiveness during slow flight Bob Reynolds Tucson Arizona has developed system operating Youngman flaps Fairey Firefly shown accompanying drawing pin holds flaps retracted position re leased flaps move down out wing swing back position near trailing edge wing spring pulls slide assembly aft As slide reaches end follower arm moves over curved end wire allowing second spring deflect flaps Bobs system comes very close dupli cating operation flaps prototype result effective increase wing area flaps deployed May1979 111
Edition: Model Aviation - 1979/05
Page Numbers: 38, 110, 111
MY January February 1979 columns dealing CL Scale basics have drawn best response Ive done far Its obvious need continue direction shed some light areas tend taken granted Well start month looking recent letter Ill put comments suggestions go Chris Genna Astoria Oregon wrote am what might call novice modeler havent competed event yet Im leaning toward scale main interest So delighted see article JanuaryMA aboutconvertingRC scale kits CL get ready take what consider first step toward scale have some questions about particular situation Ive got House Balsa YzA FW-190.. dont think plane suitable throttle least iT 049 05 1 plan skip lot detailing want thing fly well possible Sunday sport flying yet look like prototype air craft. ontemplating entering plane stand-way-oft scale event tions Does what said about powerthat engine size stated box okayapply kits small Some flying buddies think Ill need oomph like perhaps 09 dont know what base just gut reaction guess Reply Since Ive never built House Balsa FW-190 cant predict exactly will perform control lines can give own gut reactions would go about ff1 shoes Its interesting project some exciting possibilities Kept extremely light weight no throttle extra detailing may end up CL version Peanut Scale would lean towards strong light engine like Cox TD 051 09 fact TD 09 about lightest engine its size know might best choice Dont too concerned about needing extra power overcome drag full-bodied fuselage Guys often make mistake assuming full-bodied scale model will have lot drag slim profile type lot cases Continued page 110 GOOD FOR WHERE NO C Ir Drawing No 2 order CL Scale moaci fly wings level put leadouts correct relationship models CG Some examples shown fliers have wondered otherwise delightful airplanesCub AT-6 saydont groovesketches make clmr 38 Model Aviation Well-built sport-scale Stearman PT-i 7 David Brandert Fremont NE Fox 59 power G-S 3-line control system Sig silk dope finish Drawing No 1 poin airpiane about wnmcn can pertectly balanced CGthe center aircraws total weight Text explains its importanca control sys tem installation CL Scala wish locate exact location CG suspend plane two different canter-line points extend lines intersectionthe CGI say CG found properly located unless plane has balanced C/L Flyer SAFELOK LAUNCHER FEATURES plated 1/8 steel support member plated 3/32 manganese bronze moving parts 050 X aluminum anchor strap simple anchoring stake turf spike asphalt screw eye-bolt 6-32 T nut furnished board mounting 25 lb capacity will pull apart 125 Ibs spring biased restraint arm thrown open position release $495 pp USA WRITE ST CLAIR MODEL COMPONENTS P0 Box 5626 Eugene OR 97405 WHY PAY MORE big buy high performance *FIREBALL #H30 HOT 3 volts faster starts #S20 STANDARD 24 volts general use #C15 COOL 15 volts cures pre-ignifion ust fun stick FIRE BALL great engine runs * advanced98 FLASH STARTING0 UNEXCELLED POWEP LONGER LIFE0 LOWEST DRAIN GLOW PLUGS SWANSON ASSOCIATES P0 BOX 161WAYNE NEW JEMEY 07470 However use fixtures shown Reset Fixtures drawing designed Frank Garzon seldom lose piston Place aluminum anvil plug 1 X 1 anvil step facing upward assembly placed rigid flat surface insert piston face down against plug Place modified Kim tool against ball socket maintaining pressure As start hammer rotate tool frequently checking often bind rod piston socket Burrs will raised socket Kim tool Use Dremel tool deburring clean piston thoroughly soap water have lost cylinder hard burrs broke free 12 Running youre still reading exhausted Tam well conclude paragraph High-nitro fuels should used new Cox engine use K&B 100 Cox Gray 6/3 prop cut flat across tips aS dia break-in good engine after 1/2 hour running should tech 20 22000 rpm prop fuel open face pipe adapter Some fuel should evidence around first end during running signifying good shaft case fit adequate lubrication pipe speeds lubrication critical 70% nitro fuels 25 27000rpm prop indicative good performance pipe adapter usually add 2 3000 rpm ground rush break-in stage have seen tach changes 1 2000 rpm time accumulated engine Try different pistons particularly worn ones against tach improved results aforementioned rpm have initially attained SERVICES/MATERIALS 1 Cox Blank Cylinder Barrels Jack Fraher 3900 Greystone Ave Riverdale NY 10463 Tel 2125491743 2 Schnuerle Porting Service Pipe Adapter Mike Langlois 2408 west Cornwallis Dr Greensboro NC 27408 Tel 919288 5900 3 Pipe Adapters Dub Jett 4720 Aslibrook Dallas TX 75227 4 Shaft Chrome Cylinder/Case Hoain Machine work Gene Hempel 302 North Yale Dr Garland TX 75042 Tel 2142725210 5 For Information Nick Sher 815 Beech Rd Lassghorne PA 19047 Tel 2157575373 61/2 Parts Kaxtom Kraftsmassship PO Box 2699 Laguna Hills CA 92653 Gene Hempel 302 North Yale Dr Gar land TX 75042 CL Scale/Gretz continued page 38 dirty proffle model pushrods engine tank etc hanging out over place would have much drag scale model Just remember increased scale cross-section frontal area wont afitect models performance great extent unless accompanied increase weight Look fullscale Gee Bee racers relied smooth contours overcome huge frontal area Wing Loading meaning weight wing area ratio Power Loading weight thrust ratio keys good flight performance Wing Loading par ticular real difference between CL stunt CL scale model much drag frontal area Al Rabes well known stunt models good recent example So keep Focke-Wulf light aero-dynamically clean pos sible sure use braided steel control lines opposed dacron lines minimum drag Back Chris Would desirable stunting point view eliminate some three inches dihedral plans call know would remove lot scale appearance might flatter wing improve control line flying begier. Could should RC aile rons completed CL flaps Reply would check some photos three-view drawing use scale amount dihedral House Balsa may have increased dihedral RC flight Again can look some Al Rabes stunt models recent proof dihedral itself doesnt hinder stunting ability wing removable model Chris wouldnt make way Building wing model could save little weight access inside fuse isnt important RC version Likewise removable hatches other engine cowl would build too Remember light weight important hope stunt scale model problem using RC ailerons CL stunt type flaps fact area near wing tips could cause rocking motion range movement too extreme Never theless would definitely try using ailerons stunt flaps model type purpose would limit travel about vator travel starters other words maximum elevator 450 have about 15 flaps slight flap movement shouldnt cause trouble may extra edge need enable model some basic aerobatics Chris question about dihedral brings up something didnt have room talk about January column Most can grasp aircraft has fore aft balance point often mis takenly referred Center Gravity CG Actually Center Gravity refers See Drawing No 1 point airplane regardless airplanes attitude about can perfectly balanced point center aircrafts total weight Center Gravity includes fore aft balance point well balance points along aircrafts other axes 110 Model Aviation movements airplane flight pitch roll yaw revolve around Center Gravity simplest terms flying CL model tethering full-fledged aircraft circle around Naturally would ideally want hookup right aircrafts CG try actual practice normally sweep leadouts back wingtip just slightly CG compensate extra drag control lines discussed January column locate top view wing plan leadouts fore aft location tip relation models CG way average chord didnt get question leadouts vertical location end wing its relationship CG start can imagine what would happen hooked control lines up models nose tail wouldnt fly very well say least Well same would true although extreme hookup too high too low verticallylike say top canopy bottom landing gear leadouts near end wing should approximately line height-wise Center Gravity Drawing No 2 shows some basic exam ples different configurations aircraft dont know precise way find before model built exactly CG going vertically get models leadouts ballpark should cruise naturally level flight about shoulder height wings per fectly level ground need aileron deflection However its good idea make ailerons model movable just case Murphys Law #1 can happen will should come play will look much scale-like hinged can adjusted necessary after test flying compensate tendency wing fly higher lower other level flight Mike Gretz Box 162 Montezuma IA 501 71 CL Navy Carrier/Perry continued page 39 practice learn characteristics model engine perfect smooth throttle technique Balance practice good throttle tech nique important factors good low speed Neither Ron nor use moveable leadouts 20-mph flights pose no prob lems Ron uses ailerons about half Class Class II fliers side other half dont use aileronsits simpler think wing-tip weight effective ailerons maintaining line tension under flight conditions simply matter personal preference further problem often encountered low-speed flight oscillation roll near stall Rog Edwards Albuquerque New Mexico have both found washing out wing tips twisting tip leading edge down two three degrees can help solve oscillation problem Smooth throttle technique also seems help technique have found work very well Class Class II models set engine thrust line horizon tal stabilizer level zero incidence set wing root two degrees positive incidence measured leading edge trailing edge along bottom airfoil two-degree washout puts wing tips zero incidence results very light loading tips during highspeed flight seems improve elevator effectiveness during slow flight Bob Reynolds Tucson Arizona has developed system operating Youngman flaps Fairey Firefly shown accompanying drawing pin holds flaps retracted position re leased flaps move down out wing swing back position near trailing edge wing spring pulls slide assembly aft As slide reaches end follower arm moves over curved end wire allowing second spring deflect flaps Bobs system comes very close dupli cating operation flaps prototype result effective increase wing area flaps deployed May1979 111
Edition: Model Aviation - 1979/05
Page Numbers: 38, 110, 111
MY January February 1979 columns dealing CL Scale basics have drawn best response Ive done far Its obvious need continue direction shed some light areas tend taken granted Well start month looking recent letter Ill put comments suggestions go Chris Genna Astoria Oregon wrote am what might call novice modeler havent competed event yet Im leaning toward scale main interest So delighted see article JanuaryMA aboutconvertingRC scale kits CL get ready take what consider first step toward scale have some questions about particular situation Ive got House Balsa YzA FW-190.. dont think plane suitable throttle least iT 049 05 1 plan skip lot detailing want thing fly well possible Sunday sport flying yet look like prototype air craft. ontemplating entering plane stand-way-oft scale event tions Does what said about powerthat engine size stated box okayapply kits small Some flying buddies think Ill need oomph like perhaps 09 dont know what base just gut reaction guess Reply Since Ive never built House Balsa FW-190 cant predict exactly will perform control lines can give own gut reactions would go about ff1 shoes Its interesting project some exciting possibilities Kept extremely light weight no throttle extra detailing may end up CL version Peanut Scale would lean towards strong light engine like Cox TD 051 09 fact TD 09 about lightest engine its size know might best choice Dont too concerned about needing extra power overcome drag full-bodied fuselage Guys often make mistake assuming full-bodied scale model will have lot drag slim profile type lot cases Continued page 110 GOOD FOR WHERE NO C Ir Drawing No 2 order CL Scale moaci fly wings level put leadouts correct relationship models CG Some examples shown fliers have wondered otherwise delightful airplanesCub AT-6 saydont groovesketches make clmr 38 Model Aviation Well-built sport-scale Stearman PT-i 7 David Brandert Fremont NE Fox 59 power G-S 3-line control system Sig silk dope finish Drawing No 1 poin airpiane about wnmcn can pertectly balanced CGthe center aircraws total weight Text explains its importanca control sys tem installation CL Scala wish locate exact location CG suspend plane two different canter-line points extend lines intersectionthe CGI say CG found properly located unless plane has balanced C/L Flyer SAFELOK LAUNCHER FEATURES plated 1/8 steel support member plated 3/32 manganese bronze moving parts 050 X aluminum anchor strap simple anchoring stake turf spike asphalt screw eye-bolt 6-32 T nut furnished board mounting 25 lb capacity will pull apart 125 Ibs spring biased restraint arm thrown open position release $495 pp USA WRITE ST CLAIR MODEL COMPONENTS P0 Box 5626 Eugene OR 97405 WHY PAY MORE big buy high performance *FIREBALL #H30 HOT 3 volts faster starts #S20 STANDARD 24 volts general use #C15 COOL 15 volts cures pre-ignifion ust fun stick FIRE BALL great engine runs * advanced98 FLASH STARTING0 UNEXCELLED POWEP LONGER LIFE0 LOWEST DRAIN GLOW PLUGS SWANSON ASSOCIATES P0 BOX 161WAYNE NEW JEMEY 07470 However use fixtures shown Reset Fixtures drawing designed Frank Garzon seldom lose piston Place aluminum anvil plug 1 X 1 anvil step facing upward assembly placed rigid flat surface insert piston face down against plug Place modified Kim tool against ball socket maintaining pressure As start hammer rotate tool frequently checking often bind rod piston socket Burrs will raised socket Kim tool Use Dremel tool deburring clean piston thoroughly soap water have lost cylinder hard burrs broke free 12 Running youre still reading exhausted Tam well conclude paragraph High-nitro fuels should used new Cox engine use K&B 100 Cox Gray 6/3 prop cut flat across tips aS dia break-in good engine after 1/2 hour running should tech 20 22000 rpm prop fuel open face pipe adapter Some fuel should evidence around first end during running signifying good shaft case fit adequate lubrication pipe speeds lubrication critical 70% nitro fuels 25 27000rpm prop indicative good performance pipe adapter usually add 2 3000 rpm ground rush break-in stage have seen tach changes 1 2000 rpm time accumulated engine Try different pistons particularly worn ones against tach improved results aforementioned rpm have initially attained SERVICES/MATERIALS 1 Cox Blank Cylinder Barrels Jack Fraher 3900 Greystone Ave Riverdale NY 10463 Tel 2125491743 2 Schnuerle Porting Service Pipe Adapter Mike Langlois 2408 west Cornwallis Dr Greensboro NC 27408 Tel 919288 5900 3 Pipe Adapters Dub Jett 4720 Aslibrook Dallas TX 75227 4 Shaft Chrome Cylinder/Case Hoain Machine work Gene Hempel 302 North Yale Dr Garland TX 75042 Tel 2142725210 5 For Information Nick Sher 815 Beech Rd Lassghorne PA 19047 Tel 2157575373 61/2 Parts Kaxtom Kraftsmassship PO Box 2699 Laguna Hills CA 92653 Gene Hempel 302 North Yale Dr Gar land TX 75042 CL Scale/Gretz continued page 38 dirty proffle model pushrods engine tank etc hanging out over place would have much drag scale model Just remember increased scale cross-section frontal area wont afitect models performance great extent unless accompanied increase weight Look fullscale Gee Bee racers relied smooth contours overcome huge frontal area Wing Loading meaning weight wing area ratio Power Loading weight thrust ratio keys good flight performance Wing Loading par ticular real difference between CL stunt CL scale model much drag frontal area Al Rabes well known stunt models good recent example So keep Focke-Wulf light aero-dynamically clean pos sible sure use braided steel control lines opposed dacron lines minimum drag Back Chris Would desirable stunting point view eliminate some three inches dihedral plans call know would remove lot scale appearance might flatter wing improve control line flying begier. Could should RC aile rons completed CL flaps Reply would check some photos three-view drawing use scale amount dihedral House Balsa may have increased dihedral RC flight Again can look some Al Rabes stunt models recent proof dihedral itself doesnt hinder stunting ability wing removable model Chris wouldnt make way Building wing model could save little weight access inside fuse isnt important RC version Likewise removable hatches other engine cowl would build too Remember light weight important hope stunt scale model problem using RC ailerons CL stunt type flaps fact area near wing tips could cause rocking motion range movement too extreme Never theless would definitely try using ailerons stunt flaps model type purpose would limit travel about vator travel starters other words maximum elevator 450 have about 15 flaps slight flap movement shouldnt cause trouble may extra edge need enable model some basic aerobatics Chris question about dihedral brings up something didnt have room talk about January column Most can grasp aircraft has fore aft balance point often mis takenly referred Center Gravity CG Actually Center Gravity refers See Drawing No 1 point airplane regardless airplanes attitude about can perfectly balanced point center aircrafts total weight Center Gravity includes fore aft balance point well balance points along aircrafts other axes 110 Model Aviation movements airplane flight pitch roll yaw revolve around Center Gravity simplest terms flying CL model tethering full-fledged aircraft circle around Naturally would ideally want hookup right aircrafts CG try actual practice normally sweep leadouts back wingtip just slightly CG compensate extra drag control lines discussed January column locate top view wing plan leadouts fore aft location tip relation models CG way average chord didnt get question leadouts vertical location end wing its relationship CG start can imagine what would happen hooked control lines up models nose tail wouldnt fly very well say least Well same would true although extreme hookup too high too low verticallylike say top canopy bottom landing gear leadouts near end wing should approximately line height-wise Center Gravity Drawing No 2 shows some basic exam ples different configurations aircraft dont know precise way find before model built exactly CG going vertically get models leadouts ballpark should cruise naturally level flight about shoulder height wings per fectly level ground need aileron deflection However its good idea make ailerons model movable just case Murphys Law #1 can happen will should come play will look much scale-like hinged can adjusted necessary after test flying compensate tendency wing fly higher lower other level flight Mike Gretz Box 162 Montezuma IA 501 71 CL Navy Carrier/Perry continued page 39 practice learn characteristics model engine perfect smooth throttle technique Balance practice good throttle tech nique important factors good low speed Neither Ron nor use moveable leadouts 20-mph flights pose no prob lems Ron uses ailerons about half Class Class II fliers side other half dont use aileronsits simpler think wing-tip weight effective ailerons maintaining line tension under flight conditions simply matter personal preference further problem often encountered low-speed flight oscillation roll near stall Rog Edwards Albuquerque New Mexico have both found washing out wing tips twisting tip leading edge down two three degrees can help solve oscillation problem Smooth throttle technique also seems help technique have found work very well Class Class II models set engine thrust line horizon tal stabilizer level zero incidence set wing root two degrees positive incidence measured leading edge trailing edge along bottom airfoil two-degree washout puts wing tips zero incidence results very light loading tips during highspeed flight seems improve elevator effectiveness during slow flight Bob Reynolds Tucson Arizona has developed system operating Youngman flaps Fairey Firefly shown accompanying drawing pin holds flaps retracted position re leased flaps move down out wing swing back position near trailing edge wing spring pulls slide assembly aft As slide reaches end follower arm moves over curved end wire allowing second spring deflect flaps Bobs system comes very close dupli cating operation flaps prototype result effective increase wing area flaps deployed May1979 111