Control Line SINCE MY LAST months article Ive hearing more about Scale Speed proposals As may have already heard FAI passed new rule goes effect immediately cludes definite emphasis scale speed model aircraft flight Ive heard pros cons Scale Speed subject some people have ex pressed desire AMA adopt rules judging tend lean side hopes adopt such close ruling scale flying speeds charts included article borrowed Rams Horn Northwest Soaring Society newsletter will give some idea unrealistic would CL models Since CL scale builders tend build I-to-1 ale wing loading would high smaller models would able keep airplane airborne par ticularly lower landing flying speeds typical 1-in scale model wing loading vicinity 26 ounces 30 ounces per sq ft said thought un realistic measure adopt close calibra tion scale flying speed what meant take Meyers 145 down landing still have overcome same gravity forces air friction real full-sized aircraft its land ing Now could reduce earths atmosphere same scale model could come up realistic scale flying speed course feasible Scale Mike Stott scale model should buzz around CL circle fast judges see blur color continued page 88 Chart #1Realistic Scale Flight Speeds Various Models TypePrototypeOrin Scale Mph MpI11-1/223 AntiqueWright Flyer40335067100 WWINieuport 219378118155233 30sP26A230192288383575 WWIIP408340283425567850 P5 10 Top Speed4373645467281093 Cruise362301453603905 Landing10083125167250 JetF-1041315501293198325803875 Chart #2Wing Loading Stall Speeds Scale Aircraft Stall SpeedEquivalent_Scale_SpeedMph Wing Loading 1-1/223 8 81681128456 10 31881259463 12 220513710368 14 022214811174 16 723715811979 18 725216812684 20 126517713388 22 927818513993 24 229119414597 26 1302202151101 28 6314209157105 30 8325217162108 28 Model Aviation Now believe simulating ac tual flight characteristics full-sized aircraft mean fullsized aircraft slow moving flight PE RMAGLOSS COVERITE IS NOT PLASTIC made 100% polyester fibres behave differently plastic film cover ings Polyester easier apply lightweight never sags scratches flies better because its texture Try PermaGloss youll never use plastic again OEWETE 2779 Philmont Ave Huntingdon Valley Pa 19007 Yaw continued pullout pivot control handle Dont pull simultaneously lean bit turn ease line tension cause point line ten sion other point pattern SHIP IN VERTICAL FLIGHT FIG 10 ACTUAL\ 4 TANGENT TO FLIGHT PATH ii NATURAL FLIGHTjt] TENDENCY ii OFF TANGENT YAW EXCESSIVE TIP WEIGHT CAUSING YAW IN VERTICAL FLIGHT consequently greatest ten dency outboard yawing caused changing bow lines Remember Uniform line tension best assets stunt flier can have ship can usually will fly well because integral part ideal balance situation 3 Improper Lateral Balance takes affect vertical flight ship has too much too little tip weight commonly known affect roll situa tion However will also induce yaw vertical flight particularly coming level inverted flight vertical climb such wingover cause axes change relation grav ity level flight weight distribution lateral axis balanced around longitudinal axis vertical flight weight distribution lateral axis balanced around vertical axis fore inbalance too much little tip weight situation will cause mo ment around vertical axis known yawing ship perfectly balanced roll does follow will perfectly balanced yaw vertical flight re gard tip weight ultimately true tip weight balancing roll used counter aerodynamic im balance such too much lift outboard panel situation static imbalance tip weight offsetting aerodynamic imbalance excess lift outboard panel vertical flight aerodynamics change no lift situation Therefore tip weight becomes excess because being used counter opposite imbal ance So ship starts say wingover square excess tip weight will cause outboard yaw Fig 10 Unfortunately no static solu tion problem Removing tip weight would hinder roll/balance situa tion obvious solution aerodynamic Specifically must regress back problem attain ing ideal ratio inboard wing lift outboard wing lift problem re solved weight will have used advantage aerodynamic situa tion sacrifice its disadvantage another aerodynamic situation such problem just mentioned So concludes problem yaw Com pared roll surely obvious Also problems compounded because roll situation has two cleancut mediumslevel inverted flight ever yaw affects performing quality stunt ship critical Because best possible yaw situation precisely enabled control ships pitch through uniform tension way control lines ultimate ly thats definition very medium fly event flown Con trol Line Precision Aerobatics something understood reread think about what being said its still clear ask questions address 2850 E 196 St Bronx NY 10461 Fly Stunt Editors Note Concluding series articles next issue author discusses Balancing Pitch CL Scale/Stott continued page 28 strict calibration scale speeds ever adopted AMA would find would have build larger models full-sized aircraft flew higher rate speed would have build lighter achieve lighter wing load ing Lighter wing loadings will allow fly slower speed stalling See Chart #2 fact mind would limited larger lighter planes flew comparatively good speed feel would taking step backwards again restricting selection model down certain type aircraft January year some new rules proposed went effect concerning judging scale models Check column January-1976 issue Model Aviation complete list rule changes rules leveled out points given flying static judging purpose give type aircraft equal chance competition Quality quantity options should basic fundamental choosing best scale model way J-3 Cub has just good opportunity compet ing larger 4-engine bomber AMA would decide accept proposal tight emphasis actual scale flying speeds would backing up again limiting field selection scale models some cases would elimi nating altogether planes earlier eras classics address 118 East Wheeler St North Mankato MN 56001 88 Model Aviation productreviewproductreviewproductreview ,..Qi panese Tissue tissue light weight has goad covering characteristics Colors available red yellow orange blue green white Sheets 24 x 18 30 cents Complete catalogue 50 cents Peck Polymers Box 2498 LaMesa CA 92041 productreviewproductreviewproductreview
Edition: Model Aviation - 1976/06
Page Numbers: 28, 88
Control Line SINCE MY LAST months article Ive hearing more about Scale Speed proposals As may have already heard FAI passed new rule goes effect immediately cludes definite emphasis scale speed model aircraft flight Ive heard pros cons Scale Speed subject some people have ex pressed desire AMA adopt rules judging tend lean side hopes adopt such close ruling scale flying speeds charts included article borrowed Rams Horn Northwest Soaring Society newsletter will give some idea unrealistic would CL models Since CL scale builders tend build I-to-1 ale wing loading would high smaller models would able keep airplane airborne par ticularly lower landing flying speeds typical 1-in scale model wing loading vicinity 26 ounces 30 ounces per sq ft said thought un realistic measure adopt close calibra tion scale flying speed what meant take Meyers 145 down landing still have overcome same gravity forces air friction real full-sized aircraft its land ing Now could reduce earths atmosphere same scale model could come up realistic scale flying speed course feasible Scale Mike Stott scale model should buzz around CL circle fast judges see blur color continued page 88 Chart #1Realistic Scale Flight Speeds Various Models TypePrototypeOrin Scale Mph MpI11-1/223 AntiqueWright Flyer40335067100 WWINieuport 219378118155233 30sP26A230192288383575 WWIIP408340283425567850 P5 10 Top Speed4373645467281093 Cruise362301453603905 Landing10083125167250 JetF-1041315501293198325803875 Chart #2Wing Loading Stall Speeds Scale Aircraft Stall SpeedEquivalent_Scale_SpeedMph Wing Loading 1-1/223 8 81681128456 10 31881259463 12 220513710368 14 022214811174 16 723715811979 18 725216812684 20 126517713388 22 927818513993 24 229119414597 26 1302202151101 28 6314209157105 30 8325217162108 28 Model Aviation Now believe simulating ac tual flight characteristics full-sized aircraft mean fullsized aircraft slow moving flight PE RMAGLOSS COVERITE IS NOT PLASTIC made 100% polyester fibres behave differently plastic film cover ings Polyester easier apply lightweight never sags scratches flies better because its texture Try PermaGloss youll never use plastic again OEWETE 2779 Philmont Ave Huntingdon Valley Pa 19007 Yaw continued pullout pivot control handle Dont pull simultaneously lean bit turn ease line tension cause point line ten sion other point pattern SHIP IN VERTICAL FLIGHT FIG 10 ACTUAL\ 4 TANGENT TO FLIGHT PATH ii NATURAL FLIGHTjt] TENDENCY ii OFF TANGENT YAW EXCESSIVE TIP WEIGHT CAUSING YAW IN VERTICAL FLIGHT consequently greatest ten dency outboard yawing caused changing bow lines Remember Uniform line tension best assets stunt flier can have ship can usually will fly well because integral part ideal balance situation 3 Improper Lateral Balance takes affect vertical flight ship has too much too little tip weight commonly known affect roll situa tion However will also induce yaw vertical flight particularly coming level inverted flight vertical climb such wingover cause axes change relation grav ity level flight weight distribution lateral axis balanced around longitudinal axis vertical flight weight distribution lateral axis balanced around vertical axis fore inbalance too much little tip weight situation will cause mo ment around vertical axis known yawing ship perfectly balanced roll does follow will perfectly balanced yaw vertical flight re gard tip weight ultimately true tip weight balancing roll used counter aerodynamic im balance such too much lift outboard panel situation static imbalance tip weight offsetting aerodynamic imbalance excess lift outboard panel vertical flight aerodynamics change no lift situation Therefore tip weight becomes excess because being used counter opposite imbal ance So ship starts say wingover square excess tip weight will cause outboard yaw Fig 10 Unfortunately no static solu tion problem Removing tip weight would hinder roll/balance situa tion obvious solution aerodynamic Specifically must regress back problem attain ing ideal ratio inboard wing lift outboard wing lift problem re solved weight will have used advantage aerodynamic situa tion sacrifice its disadvantage another aerodynamic situation such problem just mentioned So concludes problem yaw Com pared roll surely obvious Also problems compounded because roll situation has two cleancut mediumslevel inverted flight ever yaw affects performing quality stunt ship critical Because best possible yaw situation precisely enabled control ships pitch through uniform tension way control lines ultimate ly thats definition very medium fly event flown Con trol Line Precision Aerobatics something understood reread think about what being said its still clear ask questions address 2850 E 196 St Bronx NY 10461 Fly Stunt Editors Note Concluding series articles next issue author discusses Balancing Pitch CL Scale/Stott continued page 28 strict calibration scale speeds ever adopted AMA would find would have build larger models full-sized aircraft flew higher rate speed would have build lighter achieve lighter wing load ing Lighter wing loadings will allow fly slower speed stalling See Chart #2 fact mind would limited larger lighter planes flew comparatively good speed feel would taking step backwards again restricting selection model down certain type aircraft January year some new rules proposed went effect concerning judging scale models Check column January-1976 issue Model Aviation complete list rule changes rules leveled out points given flying static judging purpose give type aircraft equal chance competition Quality quantity options should basic fundamental choosing best scale model way J-3 Cub has just good opportunity compet ing larger 4-engine bomber AMA would decide accept proposal tight emphasis actual scale flying speeds would backing up again limiting field selection scale models some cases would elimi nating altogether planes earlier eras classics address 118 East Wheeler St North Mankato MN 56001 88 Model Aviation productreviewproductreviewproductreview ,..Qi panese Tissue tissue light weight has goad covering characteristics Colors available red yellow orange blue green white Sheets 24 x 18 30 cents Complete catalogue 50 cents Peck Polymers Box 2498 LaMesa CA 92041 productreviewproductreviewproductreview