B SCALE Mike Gretz IVE mentioned before what large growth has over last few years number quality scale model kits market Granted almost labeled mislabeled RC kits equally suitable control line flying fact large percentage CL sport scale models see contests days adaptations RC scale kit majority modern kits 45 60 engine size range opinion best size top notch control line scale flight performance know several modelers making sort RC-to-CL kit conversion winter also looking first time using retracts new model no question retractable landing gears add tremendously excitement realism scale model full scale counterpart used scale kits general improvements commercial retracts over past few years has inspiring too years ago opera tionalretracts extremely rare CL RC competition scale models emphasized op erational because quite common competitor claim have retractable gears unashamedly decline use came time fly Nowadays quality dependa bility retract units market makes adding feature scale model almost easy putting engine shopping suitable retract system scale model should realize thing minimum detailing scale landing gears going too heavy hoisted up mechanical servo-driven landing gear system servo-driven units market like Kraft Goldberg Pro-Line South ern RC etc designed primarily RC pattern sport models landing gear PUSH ROD HIGH DIRECTIONS consists small wheel short plain piece music wire cases have scale-size wheel scale-length landing gear legs weight wll too much servo handle reason would never recommend considering anything pneumatic retract UP AIR LINE SLIDING BARREL/ No1 WHEEL COLLAi TO ENGINE system like Rhom Air Sonic Systems B&D scale model 45 60 engine size range Ive also found pneumatic retracts very simple actuate throttle-equipped model having add extra weight Continued page 122 ~----COMMON AIR PRESSURE LINE DOWN AIR LINE STANDARD RHOM-AIR INo2 WHEEL COLLAR SPUR WIRE SWITCHING VALVE TO BELLC RANK THROTTLE PUSHROD~~2 WRAP B SOLDER Actuate Rhom-Air retracts off throttle throttle pushrod gear control valve shown full high throttle gear up positions Read article comprehensive discussion April 1 980 47 Ed Wilowski NY built Enya 60-powered Top Flite P47 Features wing flaps coupled throttle control Ship finished Aero Gloss Ed member New York Scale Team Bill Boss photoI WW IIs F4U Corsair first US fighter exceed 400 mph Salvatore Amico built scale model Jemco kit Model flies GS 3-line control system powered K&B 40 Perry carb S Amico photo EU 330EU WV PROPS FOR BIGGIES Now can experience full thrust potential chain saw engine prop-drive new durable efficient glass-filled nylon pY NATNrati props Platt Seen QSAA Fun Flys Louisville Las Vegas Look us up WRAMS TOLEDO Direct Factory Introductory Prices New items biggies coming DYNAHUB easist safest way start big engines DYNATI-IRUST Prop Balancer Accurate Easy-to-use & inespensive Add 50 PER PROP shipping USA pay shipping charges orders 6 s Send CHECK MO VISA MC COD mounts place Cut holes bladder tube fuelproof its interior pouring about two ounces thinned white glue sloshing around pouring out excess Fuel-proof motor mount slow-curing epoxy glue last step before engine mounting check warps also im portant steps position full soft drink can four corners wing flat surface Put straight pins tip leading edge trailing edge four pins rest cans wing straight now time mount engine go flying yours fly good hope dont meet contest CL Scale/Gretz Continued page 47 fourth control line first Zlin Akrobat used standard G-S 3-line bellcrank system throttle control An inverted style bellcrank mounted fuselage solid music wire pushrod going Fox Eagle carburetor Rhom Air retract system am familiar IN STOCK NOW 186 188 208 2010 $700 700 900 900 COMING EARLY 1980 156$500 16550 166500 Dynathrust Props Inc 2541 NE 11th Court Pompano Beach FL 33062 Raymond Colelli 305 941 9119 having used since 1973 has 4-way switching valve actuate up down movements landing gears presume other pneumatic systems have similar valve valve basically junction box systems up down pressure air hoses valve has grooved sliding barrel inside routes pressurized air appropriate up down hose end barrels travel RC applications standard servo drives inner barrel end valve other Zlin use throttle pushrod same job As can see accompanying drawing spur wire wrapped soldered throttle pushrod spur wire two wheel collars small enough slide valve push barrel valve body itself securely fastened fuselage structure throttle pushrod moves forward open carburetor number 2 collar pushes barrel front valve thus connecting up air hose pressure hose bringing landing gear up Conversely throttle pushrod closes carb number 1 collar pushes barrel rear valve completes down circuit lowers landing gear use wheel collars spur wire makes exact timing retraction ex tension gears adjustable within power range engine number 2 collar adjusted gears came up absolute full high throttle Obviously makes necessary take offwith just slightly less full power avoid prematurely retracting gear ground doesnt present problem model adequately powered number 1 collar adjusted gear came down throttled back about /s-/z power setting Im sure sort actuating arrangement would work equally well model size wing loading range Zlin years flew particular model including two Nationals never reason wish could operate retracts independently throttle fact might consider using extra pneumatic air cylinder operate flaps tailhook etc conjunction retracts throttle could simply plug extra cylinder retract system same way done retractable tailwheel nose gear Mike Gretz Box 162 Montezuma IA 501 71 CL Aerobatics/Paul Con finued page 48 ears Lastly Bob said engine offset called plans might try some shims under front engine see helps line tension might also have move leadouts back forward change amount line tension Most profile kits built leadouts position Bob may have move around see helps summary good order trouble shooting case would 1 wing alignment including flaps also see stabilizer matched up line wing 2 wind direction 3 tip weight 4 engine Bob might want try entirely different engine same make another make see original just plain worn out 5 engine offset 6 leadout variation Sam Howard Quebec Canada wrote asking about banded crankshaft ST 46 Some RC friends told him imperative remove Actually have heard instance band coming loose subscribe Murphys Law would probably want remove However since operating stunt engines 7000 9500 rpm range less chance band coming loose RC fraternity usually run engines top end rpm range 15000 17000 Some people feel keeping band adds little bit crankcase packing helps performance Now time planning contest next summer use P AM P categories has become quite widespread area contest has started using method should promote P M P categories 1 Expert average AMA score 500 over 2 Advanced average score 400 499 3 Intermediate average score 300 399 4 Beginner average score under 300 Most fliers should have idea what average score dont can make educated guess after first round flying can change categories need areas stunt turnout large contest administrators have combined two classes based 122 Model Aviation IN STOCK FOR IMMEDIATE SHIPMENT QUADRAS $8995 QUADRA REPAIR- $1000 plus parts Jim Messers ERCOUPE KIT- $19500* Concepts BIG FLEET KIT-$17995* Barkleys TIGER MOTH KIT- $24995* *includes FREE Du-Bro Wheels /4-SCALE PLANS FOR QUADRA ERCOUPE SKYBOLT- $2000 Ca SUPER STEARMAN- $2495 ZINGER & TOP FLITE PROPS- 10% off BALSA & SPRUCE sizes- 45% off COCKPIT KIT Ercoupe- $1500 Stearman $1800 Fleet- $1800 RADIAL ENGINESfor Fleet- $3000 COVERITE 15 rolls- 20% off 24-Hour Service. Add $200 postage Send Bank Check Money Order JIM MESSERS QUALITY MODEL PRODUCTS 196 Valley View DrAllegany NY 14706 Heres equipment yeu need give props toe very Sent balance--balance directions Carefully crafted free top grade materials BUBBLE BALANCER accomodates 3/161/49/32 prop holes Other sizes available special order Dealers invited $1495 Add $150 HOWARD B HUEBL SEPT 005 postage handling iz Mion add 4% sales tan No CODs Boo 193 Reule 4 Mankato Mn 5011111
Edition: Model Aviation - 1980/04
Page Numbers: 47, 122
B SCALE Mike Gretz IVE mentioned before what large growth has over last few years number quality scale model kits market Granted almost labeled mislabeled RC kits equally suitable control line flying fact large percentage CL sport scale models see contests days adaptations RC scale kit majority modern kits 45 60 engine size range opinion best size top notch control line scale flight performance know several modelers making sort RC-to-CL kit conversion winter also looking first time using retracts new model no question retractable landing gears add tremendously excitement realism scale model full scale counterpart used scale kits general improvements commercial retracts over past few years has inspiring too years ago opera tionalretracts extremely rare CL RC competition scale models emphasized op erational because quite common competitor claim have retractable gears unashamedly decline use came time fly Nowadays quality dependa bility retract units market makes adding feature scale model almost easy putting engine shopping suitable retract system scale model should realize thing minimum detailing scale landing gears going too heavy hoisted up mechanical servo-driven landing gear system servo-driven units market like Kraft Goldberg Pro-Line South ern RC etc designed primarily RC pattern sport models landing gear PUSH ROD HIGH DIRECTIONS consists small wheel short plain piece music wire cases have scale-size wheel scale-length landing gear legs weight wll too much servo handle reason would never recommend considering anything pneumatic retract UP AIR LINE SLIDING BARREL/ No1 WHEEL COLLAi TO ENGINE system like Rhom Air Sonic Systems B&D scale model 45 60 engine size range Ive also found pneumatic retracts very simple actuate throttle-equipped model having add extra weight Continued page 122 ~----COMMON AIR PRESSURE LINE DOWN AIR LINE STANDARD RHOM-AIR INo2 WHEEL COLLAR SPUR WIRE SWITCHING VALVE TO BELLC RANK THROTTLE PUSHROD~~2 WRAP B SOLDER Actuate Rhom-Air retracts off throttle throttle pushrod gear control valve shown full high throttle gear up positions Read article comprehensive discussion April 1 980 47 Ed Wilowski NY built Enya 60-powered Top Flite P47 Features wing flaps coupled throttle control Ship finished Aero Gloss Ed member New York Scale Team Bill Boss photoI WW IIs F4U Corsair first US fighter exceed 400 mph Salvatore Amico built scale model Jemco kit Model flies GS 3-line control system powered K&B 40 Perry carb S Amico photo EU 330EU WV PROPS FOR BIGGIES Now can experience full thrust potential chain saw engine prop-drive new durable efficient glass-filled nylon pY NATNrati props Platt Seen QSAA Fun Flys Louisville Las Vegas Look us up WRAMS TOLEDO Direct Factory Introductory Prices New items biggies coming DYNAHUB easist safest way start big engines DYNATI-IRUST Prop Balancer Accurate Easy-to-use & inespensive Add 50 PER PROP shipping USA pay shipping charges orders 6 s Send CHECK MO VISA MC COD mounts place Cut holes bladder tube fuelproof its interior pouring about two ounces thinned white glue sloshing around pouring out excess Fuel-proof motor mount slow-curing epoxy glue last step before engine mounting check warps also im portant steps position full soft drink can four corners wing flat surface Put straight pins tip leading edge trailing edge four pins rest cans wing straight now time mount engine go flying yours fly good hope dont meet contest CL Scale/Gretz Continued page 47 fourth control line first Zlin Akrobat used standard G-S 3-line bellcrank system throttle control An inverted style bellcrank mounted fuselage solid music wire pushrod going Fox Eagle carburetor Rhom Air retract system am familiar IN STOCK NOW 186 188 208 2010 $700 700 900 900 COMING EARLY 1980 156$500 16550 166500 Dynathrust Props Inc 2541 NE 11th Court Pompano Beach FL 33062 Raymond Colelli 305 941 9119 having used since 1973 has 4-way switching valve actuate up down movements landing gears presume other pneumatic systems have similar valve valve basically junction box systems up down pressure air hoses valve has grooved sliding barrel inside routes pressurized air appropriate up down hose end barrels travel RC applications standard servo drives inner barrel end valve other Zlin use throttle pushrod same job As can see accompanying drawing spur wire wrapped soldered throttle pushrod spur wire two wheel collars small enough slide valve push barrel valve body itself securely fastened fuselage structure throttle pushrod moves forward open carburetor number 2 collar pushes barrel front valve thus connecting up air hose pressure hose bringing landing gear up Conversely throttle pushrod closes carb number 1 collar pushes barrel rear valve completes down circuit lowers landing gear use wheel collars spur wire makes exact timing retraction ex tension gears adjustable within power range engine number 2 collar adjusted gears came up absolute full high throttle Obviously makes necessary take offwith just slightly less full power avoid prematurely retracting gear ground doesnt present problem model adequately powered number 1 collar adjusted gear came down throttled back about /s-/z power setting Im sure sort actuating arrangement would work equally well model size wing loading range Zlin years flew particular model including two Nationals never reason wish could operate retracts independently throttle fact might consider using extra pneumatic air cylinder operate flaps tailhook etc conjunction retracts throttle could simply plug extra cylinder retract system same way done retractable tailwheel nose gear Mike Gretz Box 162 Montezuma IA 501 71 CL Aerobatics/Paul Con finued page 48 ears Lastly Bob said engine offset called plans might try some shims under front engine see helps line tension might also have move leadouts back forward change amount line tension Most profile kits built leadouts position Bob may have move around see helps summary good order trouble shooting case would 1 wing alignment including flaps also see stabilizer matched up line wing 2 wind direction 3 tip weight 4 engine Bob might want try entirely different engine same make another make see original just plain worn out 5 engine offset 6 leadout variation Sam Howard Quebec Canada wrote asking about banded crankshaft ST 46 Some RC friends told him imperative remove Actually have heard instance band coming loose subscribe Murphys Law would probably want remove However since operating stunt engines 7000 9500 rpm range less chance band coming loose RC fraternity usually run engines top end rpm range 15000 17000 Some people feel keeping band adds little bit crankcase packing helps performance Now time planning contest next summer use P AM P categories has become quite widespread area contest has started using method should promote P M P categories 1 Expert average AMA score 500 over 2 Advanced average score 400 499 3 Intermediate average score 300 399 4 Beginner average score under 300 Most fliers should have idea what average score dont can make educated guess after first round flying can change categories need areas stunt turnout large contest administrators have combined two classes based 122 Model Aviation IN STOCK FOR IMMEDIATE SHIPMENT QUADRAS $8995 QUADRA REPAIR- $1000 plus parts Jim Messers ERCOUPE KIT- $19500* Concepts BIG FLEET KIT-$17995* Barkleys TIGER MOTH KIT- $24995* *includes FREE Du-Bro Wheels /4-SCALE PLANS FOR QUADRA ERCOUPE SKYBOLT- $2000 Ca SUPER STEARMAN- $2495 ZINGER & TOP FLITE PROPS- 10% off BALSA & SPRUCE sizes- 45% off COCKPIT KIT Ercoupe- $1500 Stearman $1800 Fleet- $1800 RADIAL ENGINESfor Fleet- $3000 COVERITE 15 rolls- 20% off 24-Hour Service. Add $200 postage Send Bank Check Money Order JIM MESSERS QUALITY MODEL PRODUCTS 196 Valley View DrAllegany NY 14706 Heres equipment yeu need give props toe very Sent balance--balance directions Carefully crafted free top grade materials BUBBLE BALANCER accomodates 3/161/49/32 prop holes Other sizes available special order Dealers invited $1495 Add $150 HOWARD B HUEBL SEPT 005 postage handling iz Mion add 4% sales tan No CODs Boo 193 Reule 4 Mankato Mn 5011111