Indoor Model Improvement Time again said indoor models must flown repeatedly order get properly trimmed way true real secret systematic approach coupled good record keeping using sys FIG Bud Tenny tematic approach change factor test fly record resultsit possible tell exactly what improves performance much Performance Testing Although phrase other factors held con stant easily made come true I/ FIG2 Pat respect indoor models best can testing new design evaluating new model blast off ceiling full load turns stead select make up about three rubber motors exactly alike possible weighing about 20% model weight except Pennyplane has too short fuselage use much rubber particular change trim fly model once motor record rpm rate sink RPM can measured easily counting number prop revolutions measuring time rate sink harder Such testing can done best gym bleachers allow model observed two different standardized altitudes What Look model should X launched enough turns climb level out altitude just above some selected altitude marker can observed upper bleacher level example standing particular spot may possible select distinctive feature window poster similar object Begin timing model comes level selected marker stop timing gets level similar lower marker lower marker should leat 4 ft above floor minimize effect floor turbu lence ground effect second stopwatch check rpm right after start timing period right after end time Reject test shows change rpm since means usually model running out turns Change motor size correct condition causes rpm change resume testing Establish Trim Limits model trimmed nose-up too much wing incidence nose-down too little inci dence rpm will gradually increase un til model obviously diving other hand rate sink will higher both nose-up nose-down trim posi tions Generally change sink rate will small nose-up trim opti mum trim allows broad range trim near optimum general fine trim changes will help offset air conditions siteslightly nose-down during tur bulence slightly nose-up air very calm important know ones models well enough spot minor trim changes observation model flight rpm Flight Attitude Dont let confuse flight attitude model during test period called cruise period should slightly nose-up difference will become apparent after few test sessions too much nose-up trim gives model slightly hesitant unsteady atti tude higher sink rate opti mum trim attitude will almost nose-high flight will very smooth steady Visual observation model trimmed nose-down leads descrip continued page 93 44 Model Aviation Motorstick held straight rod smaller motorstick projecting through tube anchored end Glue seam cant seen completed stick Chiltori photo 5 FF Indoor/Tenny continued page 44 tion lead sled model moves ward steadily ignoring very high level disturbancesa smooth down ward spiral Motorstick Construction Previous col umns have dealt weak crooked motor sticks showing make field repairs real repair build new motorstick both strong straight Remember motorstick does just support motor must strong enough hold wing tail proper alignment stick bends Fig 1 stabilizer gets positive incidence model will dive stick twists Fig 2 stab tilt will disturbed model wont handle full power well Strong will sound dumb motorstick indoor model other parts also must strong enough job super-strong motorstick will heavy wings must stronger carry weight model needs rubber calls domed display case held valuable Lind bergh trophy surrounded photos life Lindbergh nicely done model Spirit St Louis con structed GSLMA member completed display day made long modelers proving satisfying outlet meeting public selling hobby/ sport Almost 100 models display flown well over 100 modelers manned project following day Sunday modelers gathered Buder Park flying field combination events featuring free flight control line radio control fun events morning AMA scale events afternoon cli maxed St Louis Chicago Mail Run tradition Charles Lind bergh Prizes form trophies mer chandise provided Crestwood Plaza An additional benefit came form 45-minute live program radio prior event Association repre sentative fielded questions called over air program afforded excellent opportunity modelers conclusion GSLMA would sug gest modeling group inves tigate possibility such program area difficult completely assess value exposure public offers two distinct advantages First possible educate work dispel toy airplane image Secondly pro vides excellent outlet modelers ego trip looking forward co operation friends model ing future stronger model etc Dont let vicious circle bother Select design moderate length stick such 12 13 starter use length 7-mm dia laboratory glass tubing form shorter stick will stiffer given length larger diameter will resist twisting better Step Step wood motorsticks should C grain very speckled about 016 thick Examine sheet feel sure uniform thickness density quality Cut narrow p off end sheet moisten bend around glass form Fig 3 Trim ends exact fit balsa wrapped closely around form piece now pattern width motor stick blank Fig 4 Cut previ ously selected balsa sheet length motorstick Use straightedge sharp blade make edge balsa straight true Use pattern set straightedge exactly parallel first cut blank formed perfect rectangle width equal length pattern length equal required motorstick length steps described above require careful workmanship crucial produc ing straight strong motorstick Roll Up basic process making hollow motorstick wrap moist piece wood around form bake dry Again careful work necessarynot hard bit finicky Refer Fig 4 follow along Select piece Japanese tissue 2 longer motorstick blank about 8 wide Soak blank warm water about 10 mm Meanwhile moisten edge paper will ad glass form roll least turn paper form Remove balsa blank soaking blot excess moisture Place blank tissue exactly parallel form roll form across blank Stop rolling just blank completely rolled up note seam visible through damp tissue exactly parallel straight over until After seam straight finish rolling tissue moisten edge secure Bake form half hour oven set lowest heat allow cool Work carefully remove tissue rolled stick separate paper stick Glue Care Fig 5 shows Stan Chil tons arrangement glue seam straight last basic task metal rod 5-mm glass tube holds rolled tube straight during glueing operation Before applying glue sure seam straight begin applying glue center stick Apply small bead glue inside face seam Fig 6A press part seam closed hold Finish seam working out center both ends short space time properly glued seam makes stick perfect SPECIAL PRO SERIES 2 FOR RCFREE FLIGHT CONTROL LINE DIAPITCHPRICE 5%3485 63485 73354110 835456115 945677%125 10467130 106W 8W130 10BEES1 35 114677 7A7%B145 1166W150 ilS67150 126155 125W160 1355195 1456225 1556275 15456350 ES WIDEBLADE EW EXTRAWIDE SERIES 400 B FOR SPEED & RACING ADVANCED DESIGN ND 1 IN PYLON RACING LEADING SPEED RECORD HOLDER OP ALL TIMES circle Fig 6B fits closely nearly invisible address P 0 Box 545 Richard son TX 75080 GIu e 0 Close seam 0 B FIG6 September 1976 93 HIGH PERFORMANCE * COMPETITION PROVEN * THIN RIGID BLADES OF HARD MAPLE WOOD SUPERBLY FINISHED COMPLETELY FUEL PROOF RCPYLON RACING DIA PITCHPRICE 5354110 756125 7SN EN125 8%6% 7 7%150 66577%150 CONTROL LINE SPEED & RACING DIA PITCHPRICE 41By110 4%55%110 67885120 77510511125 68135 8SN BSN135 6577%140 51213150 N NARRDW
Edition: Model Aviation - 1976/09
Page Numbers: 44, 93
Indoor Model Improvement Time again said indoor models must flown repeatedly order get properly trimmed way true real secret systematic approach coupled good record keeping using sys FIG Bud Tenny tematic approach change factor test fly record resultsit possible tell exactly what improves performance much Performance Testing Although phrase other factors held con stant easily made come true I/ FIG2 Pat respect indoor models best can testing new design evaluating new model blast off ceiling full load turns stead select make up about three rubber motors exactly alike possible weighing about 20% model weight except Pennyplane has too short fuselage use much rubber particular change trim fly model once motor record rpm rate sink RPM can measured easily counting number prop revolutions measuring time rate sink harder Such testing can done best gym bleachers allow model observed two different standardized altitudes What Look model should X launched enough turns climb level out altitude just above some selected altitude marker can observed upper bleacher level example standing particular spot may possible select distinctive feature window poster similar object Begin timing model comes level selected marker stop timing gets level similar lower marker lower marker should leat 4 ft above floor minimize effect floor turbu lence ground effect second stopwatch check rpm right after start timing period right after end time Reject test shows change rpm since means usually model running out turns Change motor size correct condition causes rpm change resume testing Establish Trim Limits model trimmed nose-up too much wing incidence nose-down too little inci dence rpm will gradually increase un til model obviously diving other hand rate sink will higher both nose-up nose-down trim posi tions Generally change sink rate will small nose-up trim opti mum trim allows broad range trim near optimum general fine trim changes will help offset air conditions siteslightly nose-down during tur bulence slightly nose-up air very calm important know ones models well enough spot minor trim changes observation model flight rpm Flight Attitude Dont let confuse flight attitude model during test period called cruise period should slightly nose-up difference will become apparent after few test sessions too much nose-up trim gives model slightly hesitant unsteady atti tude higher sink rate opti mum trim attitude will almost nose-high flight will very smooth steady Visual observation model trimmed nose-down leads descrip continued page 93 44 Model Aviation Motorstick held straight rod smaller motorstick projecting through tube anchored end Glue seam cant seen completed stick Chiltori photo 5 FF Indoor/Tenny continued page 44 tion lead sled model moves ward steadily ignoring very high level disturbancesa smooth down ward spiral Motorstick Construction Previous col umns have dealt weak crooked motor sticks showing make field repairs real repair build new motorstick both strong straight Remember motorstick does just support motor must strong enough hold wing tail proper alignment stick bends Fig 1 stabilizer gets positive incidence model will dive stick twists Fig 2 stab tilt will disturbed model wont handle full power well Strong will sound dumb motorstick indoor model other parts also must strong enough job super-strong motorstick will heavy wings must stronger carry weight model needs rubber calls domed display case held valuable Lind bergh trophy surrounded photos life Lindbergh nicely done model Spirit St Louis con structed GSLMA member completed display day made long modelers proving satisfying outlet meeting public selling hobby/ sport Almost 100 models display flown well over 100 modelers manned project following day Sunday modelers gathered Buder Park flying field combination events featuring free flight control line radio control fun events morning AMA scale events afternoon cli maxed St Louis Chicago Mail Run tradition Charles Lind bergh Prizes form trophies mer chandise provided Crestwood Plaza An additional benefit came form 45-minute live program radio prior event Association repre sentative fielded questions called over air program afforded excellent opportunity modelers conclusion GSLMA would sug gest modeling group inves tigate possibility such program area difficult completely assess value exposure public offers two distinct advantages First possible educate work dispel toy airplane image Secondly pro vides excellent outlet modelers ego trip looking forward co operation friends model ing future stronger model etc Dont let vicious circle bother Select design moderate length stick such 12 13 starter use length 7-mm dia laboratory glass tubing form shorter stick will stiffer given length larger diameter will resist twisting better Step Step wood motorsticks should C grain very speckled about 016 thick Examine sheet feel sure uniform thickness density quality Cut narrow p off end sheet moisten bend around glass form Fig 3 Trim ends exact fit balsa wrapped closely around form piece now pattern width motor stick blank Fig 4 Cut previ ously selected balsa sheet length motorstick Use straightedge sharp blade make edge balsa straight true Use pattern set straightedge exactly parallel first cut blank formed perfect rectangle width equal length pattern length equal required motorstick length steps described above require careful workmanship crucial produc ing straight strong motorstick Roll Up basic process making hollow motorstick wrap moist piece wood around form bake dry Again careful work necessarynot hard bit finicky Refer Fig 4 follow along Select piece Japanese tissue 2 longer motorstick blank about 8 wide Soak blank warm water about 10 mm Meanwhile moisten edge paper will ad glass form roll least turn paper form Remove balsa blank soaking blot excess moisture Place blank tissue exactly parallel form roll form across blank Stop rolling just blank completely rolled up note seam visible through damp tissue exactly parallel straight over until After seam straight finish rolling tissue moisten edge secure Bake form half hour oven set lowest heat allow cool Work carefully remove tissue rolled stick separate paper stick Glue Care Fig 5 shows Stan Chil tons arrangement glue seam straight last basic task metal rod 5-mm glass tube holds rolled tube straight during glueing operation Before applying glue sure seam straight begin applying glue center stick Apply small bead glue inside face seam Fig 6A press part seam closed hold Finish seam working out center both ends short space time properly glued seam makes stick perfect SPECIAL PRO SERIES 2 FOR RCFREE FLIGHT CONTROL LINE DIAPITCHPRICE 5%3485 63485 73354110 835456115 945677%125 10467130 106W 8W130 10BEES1 35 114677 7A7%B145 1166W150 ilS67150 126155 125W160 1355195 1456225 1556275 15456350 ES WIDEBLADE EW EXTRAWIDE SERIES 400 B FOR SPEED & RACING ADVANCED DESIGN ND 1 IN PYLON RACING LEADING SPEED RECORD HOLDER OP ALL TIMES circle Fig 6B fits closely nearly invisible address P 0 Box 545 Richard son TX 75080 GIu e 0 Close seam 0 B FIG6 September 1976 93 HIGH PERFORMANCE * COMPETITION PROVEN * THIN RIGID BLADES OF HARD MAPLE WOOD SUPERBLY FINISHED COMPLETELY FUEL PROOF RCPYLON RACING DIA PITCHPRICE 5354110 756125 7SN EN125 8%6% 7 7%150 66577%150 CONTROL LINE SPEED & RACING DIA PITCHPRICE 41By110 4%55%110 67885120 77510511125 68135 8SN BSN135 6577%140 51213150 N NARRDW