THE TREK Orlando Florida Tangerine International RC Contest has become ritual refugees frozen north 1978 event no exception would hate calculate average distance contestants drove must have approached 1000 miles Thats heck way go fly toy airplanes Nevertheless Tangerine Contest has become thing late year year returned after missing previous two years due Christmas trips relatives respectively contest still same comfortable flavor couple nice touches bags tangerines special flight caps conevent since five contestants entered Steve Helms flying new seven-channel Futaba competition radios Bootlegger system will cost about $850 feature just about everything could dream having radio course will have dual-rate elevator rud der aileron well roll button direction reversing throw adjustment However also will have snap-roll buttons right left control mixing switches aileron-rudder elevator-flap other features rye forgotten Steve will probably remind next time see him five-channel version will also avail able nice features price tag $550 category Both fiveand seven-channel transmitters will attractive aluminum cases look much like current competition radio Check out potential alternatives other super radios available Ive received letters about aero batic pattern classes concensus new official classes should added existing classes improve transition fliers through classes Everyone seems like idea Beginner event open fliers have never entered pattern contest previously Airplanes should simple craft retractable landing gear tuned pipes fuel pumps Schnuerle ported engines bridge gap Novice class another new class should added would testants passed out welcom ing party/registration host motel during evening prior pattern compe tition form Shulman system used expedite flight line operation worked very well new rule about allowing two attempts per official flight complicated system somewhat planned things went smoothly fact everything went smoothly except weather weather bummer would expect 2 days flying two flight lines 70 contestants flying abbreviated patterns would yield bundle rounds case Rain shut down Despite lousy conditions very few fliers lost sense humor some surprises store Nats champion Dave Brown Both Don Weitz Steve Helms edged him out Masters class Dons flying remark ably consistent spite rain gusty winds Steve highest single flight score didnt have good enough flight back up finished second place other fliers well down point total three top finishers pattern event director Wayne Potter hadnt intended have Beginner class mixup contest announcement resulted class being included Wayne ended up pleased have Beginner open fliers have advanced Novice class difference between class call Simple Novice Novice airplane should have retractable landing gear tuned pipes fuel pumps Schnuerle-ported engines Per haps new class could called Novice current Novice class could called Intermediate two new classes would permit sport flier ease pattern competition facing tremendous jump aircraft cost until flier has chance try pattern competition find out its really him addition Simple Novice class would provide class competition fliers Continued page 100 26 Model Aviation afternoon first day virtually second day about half morning last day pattern flying As result barely three rounds squeezed soggy contestants didnt help bit have local fliers say should have last week beautiful Steve Helms Radio South demonstrates soonto-be-released 7-channel Futaba Super radio Just look swItches knobs good Beginner Pattern combination Bill Elliot WORKS club Dayton OH flew Sweet Stick Beginner Tangerine contest Dave Brown now flyIng BIll Kellers modified Curare design c Tlporare info W-K HobbIes 19 N Main St Centerville OH wound too short can used adding spacers washers end wise err short direction spring has less turns other can used difference 10% maximum First last turns should wound no gap between coils 50 outside diameter strut bodies plane weighing near ten pounds likely shock spring would wound 062 diameter wire 28 din mandrel 24 turns free length fit spring space plus 25 spring has rate 225 pounds per inch deflection compressed strut its mating rebound spring preloaded 25 will support planes weight excessive deflection hard landing will compress nominal 125 deflection absorb load 28 pounds one-wheel landing 56 pounds both 5 times planes weight lower rebound springs could wound 046 diameter wire 3 1 diameter mandrel 6 turns free length fit its space plus 25 Its rate about same shock spring rebound springs omitted expect loud noises gear landing Shock rebound springs compress about equally assembly 25 heavier planes use larger wire less turns Fewer turns will stiffen spring could lead bouncy landings because higher spring rate As example 24 turns changed 18 rate pounds per inch changes 225 30 calculate loads pounds per inch deflec tion use following formula Spring rate Load 0000 d4 8 D3 N 11500000 music wire torsional modulus elasticity Small d wire diameter D s diameter spring OD minus wire din N er turns 8 constant electronic calculator its snap Multiply rate deflection get actual load spring point its travel beginning free length keeping mind spring already partially loaded assembled strut wheel alignment camber angle slight slope brings tires closer together bottom contact runway top bending axle wires camber angle dihedral angle 90 degrees added find wire bend angle Assembly sequence follows Silversolder-braze steel bracket strut body Solder brass tube hub right left axle wire Place bushing rebound spring lower leg solder other bushing top end Insert leg strut body solder lower brass bushing body making certain no solder creeps sliding fit leg Solder upper scissors bracket strut body careful alignment brazed bracket Insert shock spring solder brass stop tube upper end vent hole required stop strut will pneumatic shock absorber Assemble scissors lower bracket screws Solder lower bracket hub remove scissors tap short #256 screw lower bracket hub remove shear loads solder joint prefer use lead-tin 50-50 solder brazed steel bracket because brazing heat will damage music wire stop tube top end must very securely soldered carries considerable load compressed springs initially heavy final loads hard landing brass hexagon head screws nuts hobby shop items used model railroaders assembled Loctite prevent vibration loosening Lubricate sliding parts light oil mount struts wing should solid material such plywood main wing spar extending through center section hardwood block 50 hole bored strut epoxy glued spar Steel threaded rods go through blocks spar extending rear spar spreading load rearward shocks 156 dia music wire thick washers spacers soldered wire epoxy glued against spar husky substitute threaded rods Block rods must assembled early wing construction Most gears angle forward wheel centers forward spar single wood screw will hold strut place its socket Drawing Source George H Clapp offering 1/20th scale drawings fullsize folding-wing 1927 Fairchild FC-2 along photos scale documentation same highly detailed drawings pub lished March issue ModelAviation full-size prints original additional photos will useful prepara tion scale documentations Send 25 self addressed stamped business size envelope list George H Clapp Box 115 Central Square NY 13036 Letters Readers February column requested letters questions readers didnt expect flood correspondence followed Some highly technical little over heads average question concerned basic things bother modelers surprisingly large per centage letters other RC Scale types meaning material need addressed people alone would like personally thank took time write hope near future answer letter mail well through column Bob Dolly Wischer Rt 1 S-221 Lapham Peak Roa4 Delqfiel4 WI 53018 RC Aerobatics/Van Putte continued page 26 good enough competitive current Novice class would like compete level consistent flying ability Another opinion crops up now letters sophistication radio systems some classes should limited dual-rate switches roll-buttons impression get writers seem think radios sophistication enables flier some maneuvers doing nothing push button throw switch just case Anyone has watched busy both hands during Slow Roll maneuver can refute statement dual 100 Model Aviation rate ailerons make Slow Roll easy Similar cases can made other controls maneuvers Rate switches buttons may convenient help some degree important ingredient maneuver quality still pilot should course current technology does permit use rate sensors autopilots micro processors aircraft Combinations other devices like air density speed sensors would permit virtual prepro gramming aerobatic flight dont think anyone would propose using such systems aerobatic pattern competition least hope such systems show up contests Im sure abolishment would forthcoming very quickly RC Contest Board voting proposed rules changes left questions mind also resolved several controversial areas significant resolutions involved definition kind outside loops would performed Novice Ad vanced Expert classes con tests during 1978 including Nats con testants did know definition would used until told during pilots briefing Nats judges didnt know until judges meeting held eve pattern competition RC Contest Board voted define maneuver Reverse Outside Loops start bottom maneuvers would same 1976/1977 Rule Book second controversial rule change proposal passed Contest Board will permit attempt per official flight 1978/1979 rule book permits up two attempts per official flight allowing flier go end round less two maneuvers other takeoff landing have judged during first attempt passed unanimously Elimination Rectangular Approach Spot Landing will cause very few ffiers mourn Contest Directors already eliminated maneuvers con tests recent years rule changes will have greatest impact ones related advancement system advancement points will based number fliers lower place way everyone except last place flier will earn advance ment points top fliers will earn advance ment points equal number fliers lower placing multiplied factor corres ponding fliers placing What Im sure about exactly what multiplying factors will used what phase points advancing will factors will probably something like 6 first 5 second 4 third 3 fourth 2 fifth place phase point advancing set 200 means ten-man event would yield advancement points 54 4028 18 104 3 2 1 0 fliers like kind system because fourth place finishes would earn some points after Ron Van Putte 12 Connie Dr Shalimar FL 32579 RC Soaring /Pruss continued page 27 same rules 1 978 Regional Tournament Qualifiersthere will 10will compete Tourna ment further information contact Warren Tiahrt LSF Secretary 7647 Twilight Court Glarkston MI 48016 Some recent announcements LSF Board Directors Any AMAsanctioned club has three members attending Tournament can name three members compete team trophy tasks Tourna ment will six-minute duration four-lap cross-wind speed/distance event will norepeat nolanding coupled speed/distance task announced earlier Time task will begin moment tow release Two hundred-meter tow linestied off winch drumsfor tasks Four rounds eight tasks will scheduled scores count banquetin best tradition past SOAR Natsis scheduled Thursday July 26th Friday will rain date contest An important note LSF Secretary biggest obstacle re stricting factor staging large contests has frequenciesor lack fre May1979 101 r IF YOU BUILD FIBERGLASS MODELS YOU NEED PFC brilliant white polyester resin putty form PEG made levelling dents dips ripples chips other imperfections fiberglass parts PEG non-sagging fast setting feathers out zero thickness peeling flaking can filed drilled sanded its completely fuel proof Use PEG filling repairing reinforcing bonding shaping making fillets build anything made fiberglass need PEG KDVU1UV UEIIHP1 Division Pettit Paint co Inc imuinuuirwiu I1UHUIIIU 36 Pine Street Rockaway NJ 07866
Edition: Model Aviation - 1979/05
Page Numbers: 26, 100, 101
THE TREK Orlando Florida Tangerine International RC Contest has become ritual refugees frozen north 1978 event no exception would hate calculate average distance contestants drove must have approached 1000 miles Thats heck way go fly toy airplanes Nevertheless Tangerine Contest has become thing late year year returned after missing previous two years due Christmas trips relatives respectively contest still same comfortable flavor couple nice touches bags tangerines special flight caps conevent since five contestants entered Steve Helms flying new seven-channel Futaba competition radios Bootlegger system will cost about $850 feature just about everything could dream having radio course will have dual-rate elevator rud der aileron well roll button direction reversing throw adjustment However also will have snap-roll buttons right left control mixing switches aileron-rudder elevator-flap other features rye forgotten Steve will probably remind next time see him five-channel version will also avail able nice features price tag $550 category Both fiveand seven-channel transmitters will attractive aluminum cases look much like current competition radio Check out potential alternatives other super radios available Ive received letters about aero batic pattern classes concensus new official classes should added existing classes improve transition fliers through classes Everyone seems like idea Beginner event open fliers have never entered pattern contest previously Airplanes should simple craft retractable landing gear tuned pipes fuel pumps Schnuerle ported engines bridge gap Novice class another new class should added would testants passed out welcom ing party/registration host motel during evening prior pattern compe tition form Shulman system used expedite flight line operation worked very well new rule about allowing two attempts per official flight complicated system somewhat planned things went smoothly fact everything went smoothly except weather weather bummer would expect 2 days flying two flight lines 70 contestants flying abbreviated patterns would yield bundle rounds case Rain shut down Despite lousy conditions very few fliers lost sense humor some surprises store Nats champion Dave Brown Both Don Weitz Steve Helms edged him out Masters class Dons flying remark ably consistent spite rain gusty winds Steve highest single flight score didnt have good enough flight back up finished second place other fliers well down point total three top finishers pattern event director Wayne Potter hadnt intended have Beginner class mixup contest announcement resulted class being included Wayne ended up pleased have Beginner open fliers have advanced Novice class difference between class call Simple Novice Novice airplane should have retractable landing gear tuned pipes fuel pumps Schnuerle-ported engines Per haps new class could called Novice current Novice class could called Intermediate two new classes would permit sport flier ease pattern competition facing tremendous jump aircraft cost until flier has chance try pattern competition find out its really him addition Simple Novice class would provide class competition fliers Continued page 100 26 Model Aviation afternoon first day virtually second day about half morning last day pattern flying As result barely three rounds squeezed soggy contestants didnt help bit have local fliers say should have last week beautiful Steve Helms Radio South demonstrates soonto-be-released 7-channel Futaba Super radio Just look swItches knobs good Beginner Pattern combination Bill Elliot WORKS club Dayton OH flew Sweet Stick Beginner Tangerine contest Dave Brown now flyIng BIll Kellers modified Curare design c Tlporare info W-K HobbIes 19 N Main St Centerville OH wound too short can used adding spacers washers end wise err short direction spring has less turns other can used difference 10% maximum First last turns should wound no gap between coils 50 outside diameter strut bodies plane weighing near ten pounds likely shock spring would wound 062 diameter wire 28 din mandrel 24 turns free length fit spring space plus 25 spring has rate 225 pounds per inch deflection compressed strut its mating rebound spring preloaded 25 will support planes weight excessive deflection hard landing will compress nominal 125 deflection absorb load 28 pounds one-wheel landing 56 pounds both 5 times planes weight lower rebound springs could wound 046 diameter wire 3 1 diameter mandrel 6 turns free length fit its space plus 25 Its rate about same shock spring rebound springs omitted expect loud noises gear landing Shock rebound springs compress about equally assembly 25 heavier planes use larger wire less turns Fewer turns will stiffen spring could lead bouncy landings because higher spring rate As example 24 turns changed 18 rate pounds per inch changes 225 30 calculate loads pounds per inch deflec tion use following formula Spring rate Load 0000 d4 8 D3 N 11500000 music wire torsional modulus elasticity Small d wire diameter D s diameter spring OD minus wire din N er turns 8 constant electronic calculator its snap Multiply rate deflection get actual load spring point its travel beginning free length keeping mind spring already partially loaded assembled strut wheel alignment camber angle slight slope brings tires closer together bottom contact runway top bending axle wires camber angle dihedral angle 90 degrees added find wire bend angle Assembly sequence follows Silversolder-braze steel bracket strut body Solder brass tube hub right left axle wire Place bushing rebound spring lower leg solder other bushing top end Insert leg strut body solder lower brass bushing body making certain no solder creeps sliding fit leg Solder upper scissors bracket strut body careful alignment brazed bracket Insert shock spring solder brass stop tube upper end vent hole required stop strut will pneumatic shock absorber Assemble scissors lower bracket screws Solder lower bracket hub remove scissors tap short #256 screw lower bracket hub remove shear loads solder joint prefer use lead-tin 50-50 solder brazed steel bracket because brazing heat will damage music wire stop tube top end must very securely soldered carries considerable load compressed springs initially heavy final loads hard landing brass hexagon head screws nuts hobby shop items used model railroaders assembled Loctite prevent vibration loosening Lubricate sliding parts light oil mount struts wing should solid material such plywood main wing spar extending through center section hardwood block 50 hole bored strut epoxy glued spar Steel threaded rods go through blocks spar extending rear spar spreading load rearward shocks 156 dia music wire thick washers spacers soldered wire epoxy glued against spar husky substitute threaded rods Block rods must assembled early wing construction Most gears angle forward wheel centers forward spar single wood screw will hold strut place its socket Drawing Source George H Clapp offering 1/20th scale drawings fullsize folding-wing 1927 Fairchild FC-2 along photos scale documentation same highly detailed drawings pub lished March issue ModelAviation full-size prints original additional photos will useful prepara tion scale documentations Send 25 self addressed stamped business size envelope list George H Clapp Box 115 Central Square NY 13036 Letters Readers February column requested letters questions readers didnt expect flood correspondence followed Some highly technical little over heads average question concerned basic things bother modelers surprisingly large per centage letters other RC Scale types meaning material need addressed people alone would like personally thank took time write hope near future answer letter mail well through column Bob Dolly Wischer Rt 1 S-221 Lapham Peak Roa4 Delqfiel4 WI 53018 RC Aerobatics/Van Putte continued page 26 good enough competitive current Novice class would like compete level consistent flying ability Another opinion crops up now letters sophistication radio systems some classes should limited dual-rate switches roll-buttons impression get writers seem think radios sophistication enables flier some maneuvers doing nothing push button throw switch just case Anyone has watched busy both hands during Slow Roll maneuver can refute statement dual 100 Model Aviation rate ailerons make Slow Roll easy Similar cases can made other controls maneuvers Rate switches buttons may convenient help some degree important ingredient maneuver quality still pilot should course current technology does permit use rate sensors autopilots micro processors aircraft Combinations other devices like air density speed sensors would permit virtual prepro gramming aerobatic flight dont think anyone would propose using such systems aerobatic pattern competition least hope such systems show up contests Im sure abolishment would forthcoming very quickly RC Contest Board voting proposed rules changes left questions mind also resolved several controversial areas significant resolutions involved definition kind outside loops would performed Novice Ad vanced Expert classes con tests during 1978 including Nats con testants did know definition would used until told during pilots briefing Nats judges didnt know until judges meeting held eve pattern competition RC Contest Board voted define maneuver Reverse Outside Loops start bottom maneuvers would same 1976/1977 Rule Book second controversial rule change proposal passed Contest Board will permit attempt per official flight 1978/1979 rule book permits up two attempts per official flight allowing flier go end round less two maneuvers other takeoff landing have judged during first attempt passed unanimously Elimination Rectangular Approach Spot Landing will cause very few ffiers mourn Contest Directors already eliminated maneuvers con tests recent years rule changes will have greatest impact ones related advancement system advancement points will based number fliers lower place way everyone except last place flier will earn advance ment points top fliers will earn advance ment points equal number fliers lower placing multiplied factor corres ponding fliers placing What Im sure about exactly what multiplying factors will used what phase points advancing will factors will probably something like 6 first 5 second 4 third 3 fourth 2 fifth place phase point advancing set 200 means ten-man event would yield advancement points 54 4028 18 104 3 2 1 0 fliers like kind system because fourth place finishes would earn some points after Ron Van Putte 12 Connie Dr Shalimar FL 32579 RC Soaring /Pruss continued page 27 same rules 1 978 Regional Tournament Qualifiersthere will 10will compete Tourna ment further information contact Warren Tiahrt LSF Secretary 7647 Twilight Court Glarkston MI 48016 Some recent announcements LSF Board Directors Any AMAsanctioned club has three members attending Tournament can name three members compete team trophy tasks Tourna ment will six-minute duration four-lap cross-wind speed/distance event will norepeat nolanding coupled speed/distance task announced earlier Time task will begin moment tow release Two hundred-meter tow linestied off winch drumsfor tasks Four rounds eight tasks will scheduled scores count banquetin best tradition past SOAR Natsis scheduled Thursday July 26th Friday will rain date contest An important note LSF Secretary biggest obstacle re stricting factor staging large contests has frequenciesor lack fre May1979 101 r IF YOU BUILD FIBERGLASS MODELS YOU NEED PFC brilliant white polyester resin putty form PEG made levelling dents dips ripples chips other imperfections fiberglass parts PEG non-sagging fast setting feathers out zero thickness peeling flaking can filed drilled sanded its completely fuel proof Use PEG filling repairing reinforcing bonding shaping making fillets build anything made fiberglass need PEG KDVU1UV UEIIHP1 Division Pettit Paint co Inc imuinuuirwiu I1UHUIIIU 36 Pine Street Rockaway NJ 07866
Edition: Model Aviation - 1979/05
Page Numbers: 26, 100, 101
THE TREK Orlando Florida Tangerine International RC Contest has become ritual refugees frozen north 1978 event no exception would hate calculate average distance contestants drove must have approached 1000 miles Thats heck way go fly toy airplanes Nevertheless Tangerine Contest has become thing late year year returned after missing previous two years due Christmas trips relatives respectively contest still same comfortable flavor couple nice touches bags tangerines special flight caps conevent since five contestants entered Steve Helms flying new seven-channel Futaba competition radios Bootlegger system will cost about $850 feature just about everything could dream having radio course will have dual-rate elevator rud der aileron well roll button direction reversing throw adjustment However also will have snap-roll buttons right left control mixing switches aileron-rudder elevator-flap other features rye forgotten Steve will probably remind next time see him five-channel version will also avail able nice features price tag $550 category Both fiveand seven-channel transmitters will attractive aluminum cases look much like current competition radio Check out potential alternatives other super radios available Ive received letters about aero batic pattern classes concensus new official classes should added existing classes improve transition fliers through classes Everyone seems like idea Beginner event open fliers have never entered pattern contest previously Airplanes should simple craft retractable landing gear tuned pipes fuel pumps Schnuerle ported engines bridge gap Novice class another new class should added would testants passed out welcom ing party/registration host motel during evening prior pattern compe tition form Shulman system used expedite flight line operation worked very well new rule about allowing two attempts per official flight complicated system somewhat planned things went smoothly fact everything went smoothly except weather weather bummer would expect 2 days flying two flight lines 70 contestants flying abbreviated patterns would yield bundle rounds case Rain shut down Despite lousy conditions very few fliers lost sense humor some surprises store Nats champion Dave Brown Both Don Weitz Steve Helms edged him out Masters class Dons flying remark ably consistent spite rain gusty winds Steve highest single flight score didnt have good enough flight back up finished second place other fliers well down point total three top finishers pattern event director Wayne Potter hadnt intended have Beginner class mixup contest announcement resulted class being included Wayne ended up pleased have Beginner open fliers have advanced Novice class difference between class call Simple Novice Novice airplane should have retractable landing gear tuned pipes fuel pumps Schnuerle-ported engines Per haps new class could called Novice current Novice class could called Intermediate two new classes would permit sport flier ease pattern competition facing tremendous jump aircraft cost until flier has chance try pattern competition find out its really him addition Simple Novice class would provide class competition fliers Continued page 100 26 Model Aviation afternoon first day virtually second day about half morning last day pattern flying As result barely three rounds squeezed soggy contestants didnt help bit have local fliers say should have last week beautiful Steve Helms Radio South demonstrates soonto-be-released 7-channel Futaba Super radio Just look swItches knobs good Beginner Pattern combination Bill Elliot WORKS club Dayton OH flew Sweet Stick Beginner Tangerine contest Dave Brown now flyIng BIll Kellers modified Curare design c Tlporare info W-K HobbIes 19 N Main St Centerville OH wound too short can used adding spacers washers end wise err short direction spring has less turns other can used difference 10% maximum First last turns should wound no gap between coils 50 outside diameter strut bodies plane weighing near ten pounds likely shock spring would wound 062 diameter wire 28 din mandrel 24 turns free length fit spring space plus 25 spring has rate 225 pounds per inch deflection compressed strut its mating rebound spring preloaded 25 will support planes weight excessive deflection hard landing will compress nominal 125 deflection absorb load 28 pounds one-wheel landing 56 pounds both 5 times planes weight lower rebound springs could wound 046 diameter wire 3 1 diameter mandrel 6 turns free length fit its space plus 25 Its rate about same shock spring rebound springs omitted expect loud noises gear landing Shock rebound springs compress about equally assembly 25 heavier planes use larger wire less turns Fewer turns will stiffen spring could lead bouncy landings because higher spring rate As example 24 turns changed 18 rate pounds per inch changes 225 30 calculate loads pounds per inch deflec tion use following formula Spring rate Load 0000 d4 8 D3 N 11500000 music wire torsional modulus elasticity Small d wire diameter D s diameter spring OD minus wire din N er turns 8 constant electronic calculator its snap Multiply rate deflection get actual load spring point its travel beginning free length keeping mind spring already partially loaded assembled strut wheel alignment camber angle slight slope brings tires closer together bottom contact runway top bending axle wires camber angle dihedral angle 90 degrees added find wire bend angle Assembly sequence follows Silversolder-braze steel bracket strut body Solder brass tube hub right left axle wire Place bushing rebound spring lower leg solder other bushing top end Insert leg strut body solder lower brass bushing body making certain no solder creeps sliding fit leg Solder upper scissors bracket strut body careful alignment brazed bracket Insert shock spring solder brass stop tube upper end vent hole required stop strut will pneumatic shock absorber Assemble scissors lower bracket screws Solder lower bracket hub remove scissors tap short #256 screw lower bracket hub remove shear loads solder joint prefer use lead-tin 50-50 solder brazed steel bracket because brazing heat will damage music wire stop tube top end must very securely soldered carries considerable load compressed springs initially heavy final loads hard landing brass hexagon head screws nuts hobby shop items used model railroaders assembled Loctite prevent vibration loosening Lubricate sliding parts light oil mount struts wing should solid material such plywood main wing spar extending through center section hardwood block 50 hole bored strut epoxy glued spar Steel threaded rods go through blocks spar extending rear spar spreading load rearward shocks 156 dia music wire thick washers spacers soldered wire epoxy glued against spar husky substitute threaded rods Block rods must assembled early wing construction Most gears angle forward wheel centers forward spar single wood screw will hold strut place its socket Drawing Source George H Clapp offering 1/20th scale drawings fullsize folding-wing 1927 Fairchild FC-2 along photos scale documentation same highly detailed drawings pub lished March issue ModelAviation full-size prints original additional photos will useful prepara tion scale documentations Send 25 self addressed stamped business size envelope list George H Clapp Box 115 Central Square NY 13036 Letters Readers February column requested letters questions readers didnt expect flood correspondence followed Some highly technical little over heads average question concerned basic things bother modelers surprisingly large per centage letters other RC Scale types meaning material need addressed people alone would like personally thank took time write hope near future answer letter mail well through column Bob Dolly Wischer Rt 1 S-221 Lapham Peak Roa4 Delqfiel4 WI 53018 RC Aerobatics/Van Putte continued page 26 good enough competitive current Novice class would like compete level consistent flying ability Another opinion crops up now letters sophistication radio systems some classes should limited dual-rate switches roll-buttons impression get writers seem think radios sophistication enables flier some maneuvers doing nothing push button throw switch just case Anyone has watched busy both hands during Slow Roll maneuver can refute statement dual 100 Model Aviation rate ailerons make Slow Roll easy Similar cases can made other controls maneuvers Rate switches buttons may convenient help some degree important ingredient maneuver quality still pilot should course current technology does permit use rate sensors autopilots micro processors aircraft Combinations other devices like air density speed sensors would permit virtual prepro gramming aerobatic flight dont think anyone would propose using such systems aerobatic pattern competition least hope such systems show up contests Im sure abolishment would forthcoming very quickly RC Contest Board voting proposed rules changes left questions mind also resolved several controversial areas significant resolutions involved definition kind outside loops would performed Novice Ad vanced Expert classes con tests during 1978 including Nats con testants did know definition would used until told during pilots briefing Nats judges didnt know until judges meeting held eve pattern competition RC Contest Board voted define maneuver Reverse Outside Loops start bottom maneuvers would same 1976/1977 Rule Book second controversial rule change proposal passed Contest Board will permit attempt per official flight 1978/1979 rule book permits up two attempts per official flight allowing flier go end round less two maneuvers other takeoff landing have judged during first attempt passed unanimously Elimination Rectangular Approach Spot Landing will cause very few ffiers mourn Contest Directors already eliminated maneuvers con tests recent years rule changes will have greatest impact ones related advancement system advancement points will based number fliers lower place way everyone except last place flier will earn advance ment points top fliers will earn advance ment points equal number fliers lower placing multiplied factor corres ponding fliers placing What Im sure about exactly what multiplying factors will used what phase points advancing will factors will probably something like 6 first 5 second 4 third 3 fourth 2 fifth place phase point advancing set 200 means ten-man event would yield advancement points 54 4028 18 104 3 2 1 0 fliers like kind system because fourth place finishes would earn some points after Ron Van Putte 12 Connie Dr Shalimar FL 32579 RC Soaring /Pruss continued page 27 same rules 1 978 Regional Tournament Qualifiersthere will 10will compete Tourna ment further information contact Warren Tiahrt LSF Secretary 7647 Twilight Court Glarkston MI 48016 Some recent announcements LSF Board Directors Any AMAsanctioned club has three members attending Tournament can name three members compete team trophy tasks Tourna ment will six-minute duration four-lap cross-wind speed/distance event will norepeat nolanding coupled speed/distance task announced earlier Time task will begin moment tow release Two hundred-meter tow linestied off winch drumsfor tasks Four rounds eight tasks will scheduled scores count banquetin best tradition past SOAR Natsis scheduled Thursday July 26th Friday will rain date contest An important note LSF Secretary biggest obstacle re stricting factor staging large contests has frequenciesor lack fre May1979 101 r IF YOU BUILD FIBERGLASS MODELS YOU NEED PFC brilliant white polyester resin putty form PEG made levelling dents dips ripples chips other imperfections fiberglass parts PEG non-sagging fast setting feathers out zero thickness peeling flaking can filed drilled sanded its completely fuel proof Use PEG filling repairing reinforcing bonding shaping making fillets build anything made fiberglass need PEG KDVU1UV UEIIHP1 Division Pettit Paint co Inc imuinuuirwiu I1UHUIIIU 36 Pine Street Rockaway NJ 07866