WHAT IN HEAVENS name reader may very well ask highperformance P-30 Indeed does sound like contradiction terms much oxymoron say House ethics friendly foe Jumbo shrimp After P-30 event designated entrylevel rubber-powered affair P-30 model simple easily built little plane master Scale builder designer decides try hand high-performance model entrylevel event like P-30 end up innovations ideas make own models perform better U Dave Platt Dragon liv P-30 merely average flight performance Most well-trimmed ones will fly minute So violate whole intent aiming higher performance slip Dragonfly Just see what can done thats knew along didnt willing stretch boun daries rules little tinker predictable can get launch climb-out sequence au thor Dave Platt releases Dragonfly P-30 Steep angle rapid climb due very light frame other factors give model its competitive edge Pleasing lines also provide nice deviation tra ditionally square-shaped P-30-class models /1 grams allowed 10 grams rubber power total 50 grams mini mum flying weight Ordinarily course key obtain ing good duration rubber-powered model lies finding optimum marriage prop power As weve seen above however P-30 class both prop dimen sions power fixed Any perform ance enhancement must therefore come airframe design agree Continued page 155 56 Model Aviation evolution Dragonfly VersIon 1 left bit overweight flew well theless lighter version right the plans show really competative w w exciting performance still within P-30 class specifications Dragonfly should thought example what can achieved P-30 rules formula simple No di mension either wingspan overall length may exceed 30 propeller must commercial plastic about 91/2 diameter has altered way airframe whole model less rubber must weigh least 40 Old-Timer Three-Views Featured Columns First Decade 1978 February April June August October 1979 January March May July September 1980 February April August October 1981 January March May September December 1982 April Advanced Challenger Cumulus Shereshaw Pacemaker Ohlsson Quaker Flash Megow Premier Lion British Thermal Magnet Bay Ridge Red Zephyr Scientific Vulcan RussellBritish Utility Hacker American Ace Berkeley Riser Rider Marquardt Streamlined Cyclone Bob Jeffery Scorpion Keil KraftBritish Tubby Joe Weathers Rearwin Speedster Cleveland Hornet Sal Taibi Cavalier Berkeley Mercury IV British Cloud Hopper Schwartz Winged Victory Joe Weathers Snow White 20 Effinger King Burd Burd Models Hoosier Hot-Shot Foxworthy Citizen Bill Winter TD Coupe Dykzeul Bi-Fly Phil Kraft Simplex Paul Plecan Live Wire Bipe Hal deBolt Sunduster Jerry Broffman Dragon Fly Williams Blackhawk Peerless Supply Cloudster Mk Cleveland Pylon Buster Vasquez Commando Ontario Models Lancer New Cyclone Mfg Buzzerd KenHi Pacificoaster Joe Weathers Varsity Scientific Bowden Trophy Winner Krupp Buccaneer Standard Berkeley Nomad Chuck Hollinger Berryloid Winner Hal Coovert MayNimbus Shereshaw JulyLil Misery John Worth September Spook 72 Modelcraft December Hangar 13 Ten-Footer Ralph Beck 1988 February Cloud Cruiser Henry E Moyer AprilGross Wing Bernard Gross June August 1983 January March May July September 1984 January March May July September 1985 February April June October 1986 February April June October 1987 January March RC Pylon Racing/Hager Continued page 54 results Standard Q500l Duane Felstet 2 Dan Powell 3 Darrol Cady 4 Wayne Venetz 5 Ken Helgerson Modified QSOOl Greg Corliss 2 Duane Felstet 3 Earl Seaholm 4 Wayne Venetz 5 AJ Seaholm Formula II Murray Hamula 1240 2 Leon Elbert 130 3 Hans Algard 140 4 Duane Felstet 139 5 Wayne Venetz 157 Heres get kits engines Kits Item Formula Manufact urer PhoneAddress 213 835-1660 Ravenna 4764Wilmington CA 90744 Lit Toni Prather Products Terry Prather Pauls Fly-619 743-PO Box 121 ing Stuff5458Escondido CA Paul92025 Steinberg Ritchs713 661Hobbies5458 4104 Lark Houston TX 77025 12055 206th Issaquah WA 98027 1420 W 160th Seattle WA 98166 502 Cherry Southlake TX 76092 tlenight Spcl Cosmic Wind Pole Cat Dick Ritch Shoestring Don Rice 206 2284170 Shoestring Tom Strom 206 246Lit Toni4258 Estrellita Jerry Small 817 4816456 EnginesStock Supertigre X-40 Superligre X-40 Ritchs Hobbies John Han cock See Above See Above 915 672-PO Box 2694 8568Abilene TX 79604 501 782-4305 Kelley 8506Ft Smith AR 72904 Supertigre Model X-40tronics Terry Rollins K&B 40 K&B Mfg 213 803J&J1423 Brodheck 12152 5 Woodruff Downey CA 90241 EnginesModified Ready Race SupertigrePerform-619 729-PO Box 4003 X-40ance Speci-1658Carlsbad CA alties92008 SupertigreJohn Han-See AboveSee Above X-40cock K&B 40 Lee Custom 813 352-7215 Foothill Engines3766Tujunga CA Clarence90241 Lee Ive missed someone please write Ill try get Next month will list accessor ies Q500 kits Please keep cards letters photos coming Dragonfly/Platt Continued page 56 no-compromises approach building significant gains performance can made So easy building goes out Win dow Still constructing model like Gone forever nightmare heli-flier dreads stepping 3 foot tenna ripping off front prized chopper just its ready fly Base loaded short WHIP ANTENNA gives hidden performance Less 7 long can mounted project front helicopter inside canopy virtually invisible GO5LAAA MODEL PRODUcTs 23961 CRAFTSMAN RD CALABASAS CA 91302 818 992-0195 218 VERNON ROAD GREENVILLE PA 16125 412 588-1321 April 1988 155 RAINBOW RUNNER PURE PERFORMANCE Rainbow Runner delivers total pattern performance 25 45 sizes Designed features pattern champion Rainbow Runner ready meet exceed expectations %fl PRECI SION PRODUCTS INC 114 592-5144 510 E Arrow Highway San Dimas CA 91773 Whip Antenna Gives Hidden Per foranance RADIO SOUTH AUTHORIZED SERVICE CENTERTh Call Sam Leonard Tony Stiliman custom work competition needs stock complete hobby line specializing competition accessoriesall discounted prices Radio South Batteries 500 ma Pack 48V1100 Futaba conn1350 800 ma Pack 48V1950 Futaba conn2275 1200 ma Pack 48V2100 Futaba conn2425 TX batt Futaba G-Series PCM2450 Frequency Conversions ________ t$40 _________-z FutabaAM$30 Futaba FM$40 ProLine/Ace$30 Featuring fast service repair $10 qualified people Mode Change $35 latest equipment inciuding O%OWe Repair Heli Sets SPECTRUM ANAL YZERand Gyros Orders COD VISA MC Ship Charges Only LPricessubject change noticeOPEN 8 5 CST %....... 43 West Nine Mile Rd Pensacola FL 32514 904 478-6745 Dragonfly slightly compli cated time-consuming building standard P-30 Redesigning airframe isnt se cret getting high performance P-30 Other characteristics have factored too First its essential build model down minimum weight allowed rules yours does turn out overweight banish offending part replace P-30 ships built due care matter consequently often weigh 60 70 80 grams flying trim such models duration inevitably suffers Second must ensure plastic propeller forced use least smooth running friction minimized freewheel works perfectly latter regard too common P-30 have faulty freewheel mechanism resulting frozen prop sometimes nose block itself will fall out end power run remain dangling motor Dragonfly built powered exactly plans youll avert both problems either obvi ously has disastrous effects glide Ten grams Y16-in rubber works out about 76 in length before lubricant folded four strands intended length results puts slight tension rubber its completely un wound retains nose block Fur thermore key perfect freewheel solder washer onto prop shaft about 1/4 behind prop Make sure prop spins very freely shaft doesnt wobble motor pul ling shaft rearward washer will next ball-race prop will have plenty room slide rearward until clutch disengaged entirely ensuring good freewheel Third use winding tube rolled bit drafting Mylar will allow wind rubber motor limit fear exploded fuselage Without tube anxiety about possibil ity accident forces prudent wind-up duration suffers Fourth P-30 rules formula limits wingspan wing area fore very low aspect ratio could double benefit As area increased wing loading reduced wing chord raised airfoil should become PRODUCTS Complete Line Exhaust Systems * Tuned Pipes led Tuned Pipes * Headers uri Mufflers Expansion Mufflers copter Ball Mufflers Specialized Exhaust Systems Unsurpaar War efficient Whether exists some practical theoretical limit approach remains yet unproven Dragonflys aspect ratio 67 half typical Wakefield yet may still bordering too low airfoils could have chosen 7% Gard finally selected decision purely arbitrary un doubtedly comparable Benedeks Isaacsons similar brand would have just good Perhaps what settled matter Mr Gard noted recom mended turbulator locations whereas others did reasons may clear have observed fitting upper-surface spars locations seems work just well actual tar bulator performance Dragonfly has given very persuasive results Its glide soft light almost undulating float quite unlike typical 30-in Rubber model sides vastly increasing ordinary still-air du ration such glide makes the weakest lift good air Its always difficult foolhardy quote dead-air times dead air may technically misnomer keep dead air still compare dead air yours Nevertheless can describe typ ical Dragonfly flight follows fast steep upward right spiral about six sec onds followed gradually diminishing climb angle significant further height gain until 35-second mark point rubber unwound model some 150 ft high Easing wide right glide plane lands about 140 150 clock lift youre immediately over two-minute max Two final suggestions Always light DT dont go thinking can fly Dragonfly school playing field lit tle rascal needs some room k know 158 Model Aviation A
Edition: Model Aviation - 1988/04
Page Numbers: 56, 155, 158
WHAT IN HEAVENS name reader may very well ask highperformance P-30 Indeed does sound like contradiction terms much oxymoron say House ethics friendly foe Jumbo shrimp After P-30 event designated entrylevel rubber-powered affair P-30 model simple easily built little plane master Scale builder designer decides try hand high-performance model entrylevel event like P-30 end up innovations ideas make own models perform better U Dave Platt Dragon liv P-30 merely average flight performance Most well-trimmed ones will fly minute So violate whole intent aiming higher performance slip Dragonfly Just see what can done thats knew along didnt willing stretch boun daries rules little tinker predictable can get launch climb-out sequence au thor Dave Platt releases Dragonfly P-30 Steep angle rapid climb due very light frame other factors give model its competitive edge Pleasing lines also provide nice deviation tra ditionally square-shaped P-30-class models /1 grams allowed 10 grams rubber power total 50 grams mini mum flying weight Ordinarily course key obtain ing good duration rubber-powered model lies finding optimum marriage prop power As weve seen above however P-30 class both prop dimen sions power fixed Any perform ance enhancement must therefore come airframe design agree Continued page 155 56 Model Aviation evolution Dragonfly VersIon 1 left bit overweight flew well theless lighter version right the plans show really competative w w exciting performance still within P-30 class specifications Dragonfly should thought example what can achieved P-30 rules formula simple No di mension either wingspan overall length may exceed 30 propeller must commercial plastic about 91/2 diameter has altered way airframe whole model less rubber must weigh least 40 Old-Timer Three-Views Featured Columns First Decade 1978 February April June August October 1979 January March May July September 1980 February April August October 1981 January March May September December 1982 April Advanced Challenger Cumulus Shereshaw Pacemaker Ohlsson Quaker Flash Megow Premier Lion British Thermal Magnet Bay Ridge Red Zephyr Scientific Vulcan RussellBritish Utility Hacker American Ace Berkeley Riser Rider Marquardt Streamlined Cyclone Bob Jeffery Scorpion Keil KraftBritish Tubby Joe Weathers Rearwin Speedster Cleveland Hornet Sal Taibi Cavalier Berkeley Mercury IV British Cloud Hopper Schwartz Winged Victory Joe Weathers Snow White 20 Effinger King Burd Burd Models Hoosier Hot-Shot Foxworthy Citizen Bill Winter TD Coupe Dykzeul Bi-Fly Phil Kraft Simplex Paul Plecan Live Wire Bipe Hal deBolt Sunduster Jerry Broffman Dragon Fly Williams Blackhawk Peerless Supply Cloudster Mk Cleveland Pylon Buster Vasquez Commando Ontario Models Lancer New Cyclone Mfg Buzzerd KenHi Pacificoaster Joe Weathers Varsity Scientific Bowden Trophy Winner Krupp Buccaneer Standard Berkeley Nomad Chuck Hollinger Berryloid Winner Hal Coovert MayNimbus Shereshaw JulyLil Misery John Worth September Spook 72 Modelcraft December Hangar 13 Ten-Footer Ralph Beck 1988 February Cloud Cruiser Henry E Moyer AprilGross Wing Bernard Gross June August 1983 January March May July September 1984 January March May July September 1985 February April June October 1986 February April June October 1987 January March RC Pylon Racing/Hager Continued page 54 results Standard Q500l Duane Felstet 2 Dan Powell 3 Darrol Cady 4 Wayne Venetz 5 Ken Helgerson Modified QSOOl Greg Corliss 2 Duane Felstet 3 Earl Seaholm 4 Wayne Venetz 5 AJ Seaholm Formula II Murray Hamula 1240 2 Leon Elbert 130 3 Hans Algard 140 4 Duane Felstet 139 5 Wayne Venetz 157 Heres get kits engines Kits Item Formula Manufact urer PhoneAddress 213 835-1660 Ravenna 4764Wilmington CA 90744 Lit Toni Prather Products Terry Prather Pauls Fly-619 743-PO Box 121 ing Stuff5458Escondido CA Paul92025 Steinberg Ritchs713 661Hobbies5458 4104 Lark Houston TX 77025 12055 206th Issaquah WA 98027 1420 W 160th Seattle WA 98166 502 Cherry Southlake TX 76092 tlenight Spcl Cosmic Wind Pole Cat Dick Ritch Shoestring Don Rice 206 2284170 Shoestring Tom Strom 206 246Lit Toni4258 Estrellita Jerry Small 817 4816456 EnginesStock Supertigre X-40 Superligre X-40 Ritchs Hobbies John Han cock See Above See Above 915 672-PO Box 2694 8568Abilene TX 79604 501 782-4305 Kelley 8506Ft Smith AR 72904 Supertigre Model X-40tronics Terry Rollins K&B 40 K&B Mfg 213 803J&J1423 Brodheck 12152 5 Woodruff Downey CA 90241 EnginesModified Ready Race SupertigrePerform-619 729-PO Box 4003 X-40ance Speci-1658Carlsbad CA alties92008 SupertigreJohn Han-See AboveSee Above X-40cock K&B 40 Lee Custom 813 352-7215 Foothill Engines3766Tujunga CA Clarence90241 Lee Ive missed someone please write Ill try get Next month will list accessor ies Q500 kits Please keep cards letters photos coming Dragonfly/Platt Continued page 56 no-compromises approach building significant gains performance can made So easy building goes out Win dow Still constructing model like Gone forever nightmare heli-flier dreads stepping 3 foot tenna ripping off front prized chopper just its ready fly Base loaded short WHIP ANTENNA gives hidden performance Less 7 long can mounted project front helicopter inside canopy virtually invisible GO5LAAA MODEL PRODUcTs 23961 CRAFTSMAN RD CALABASAS CA 91302 818 992-0195 218 VERNON ROAD GREENVILLE PA 16125 412 588-1321 April 1988 155 RAINBOW RUNNER PURE PERFORMANCE Rainbow Runner delivers total pattern performance 25 45 sizes Designed features pattern champion Rainbow Runner ready meet exceed expectations %fl PRECI SION PRODUCTS INC 114 592-5144 510 E Arrow Highway San Dimas CA 91773 Whip Antenna Gives Hidden Per foranance RADIO SOUTH AUTHORIZED SERVICE CENTERTh Call Sam Leonard Tony Stiliman custom work competition needs stock complete hobby line specializing competition accessoriesall discounted prices Radio South Batteries 500 ma Pack 48V1100 Futaba conn1350 800 ma Pack 48V1950 Futaba conn2275 1200 ma Pack 48V2100 Futaba conn2425 TX batt Futaba G-Series PCM2450 Frequency Conversions ________ t$40 _________-z FutabaAM$30 Futaba FM$40 ProLine/Ace$30 Featuring fast service repair $10 qualified people Mode Change $35 latest equipment inciuding O%OWe Repair Heli Sets SPECTRUM ANAL YZERand Gyros Orders COD VISA MC Ship Charges Only LPricessubject change noticeOPEN 8 5 CST %....... 43 West Nine Mile Rd Pensacola FL 32514 904 478-6745 Dragonfly slightly compli cated time-consuming building standard P-30 Redesigning airframe isnt se cret getting high performance P-30 Other characteristics have factored too First its essential build model down minimum weight allowed rules yours does turn out overweight banish offending part replace P-30 ships built due care matter consequently often weigh 60 70 80 grams flying trim such models duration inevitably suffers Second must ensure plastic propeller forced use least smooth running friction minimized freewheel works perfectly latter regard too common P-30 have faulty freewheel mechanism resulting frozen prop sometimes nose block itself will fall out end power run remain dangling motor Dragonfly built powered exactly plans youll avert both problems either obvi ously has disastrous effects glide Ten grams Y16-in rubber works out about 76 in length before lubricant folded four strands intended length results puts slight tension rubber its completely un wound retains nose block Fur thermore key perfect freewheel solder washer onto prop shaft about 1/4 behind prop Make sure prop spins very freely shaft doesnt wobble motor pul ling shaft rearward washer will next ball-race prop will have plenty room slide rearward until clutch disengaged entirely ensuring good freewheel Third use winding tube rolled bit drafting Mylar will allow wind rubber motor limit fear exploded fuselage Without tube anxiety about possibil ity accident forces prudent wind-up duration suffers Fourth P-30 rules formula limits wingspan wing area fore very low aspect ratio could double benefit As area increased wing loading reduced wing chord raised airfoil should become PRODUCTS Complete Line Exhaust Systems * Tuned Pipes led Tuned Pipes * Headers uri Mufflers Expansion Mufflers copter Ball Mufflers Specialized Exhaust Systems Unsurpaar War efficient Whether exists some practical theoretical limit approach remains yet unproven Dragonflys aspect ratio 67 half typical Wakefield yet may still bordering too low airfoils could have chosen 7% Gard finally selected decision purely arbitrary un doubtedly comparable Benedeks Isaacsons similar brand would have just good Perhaps what settled matter Mr Gard noted recom mended turbulator locations whereas others did reasons may clear have observed fitting upper-surface spars locations seems work just well actual tar bulator performance Dragonfly has given very persuasive results Its glide soft light almost undulating float quite unlike typical 30-in Rubber model sides vastly increasing ordinary still-air du ration such glide makes the weakest lift good air Its always difficult foolhardy quote dead-air times dead air may technically misnomer keep dead air still compare dead air yours Nevertheless can describe typ ical Dragonfly flight follows fast steep upward right spiral about six sec onds followed gradually diminishing climb angle significant further height gain until 35-second mark point rubber unwound model some 150 ft high Easing wide right glide plane lands about 140 150 clock lift youre immediately over two-minute max Two final suggestions Always light DT dont go thinking can fly Dragonfly school playing field lit tle rascal needs some room k know 158 Model Aviation A
Edition: Model Aviation - 1988/04
Page Numbers: 56, 155, 158
WHAT IN HEAVENS name reader may very well ask highperformance P-30 Indeed does sound like contradiction terms much oxymoron say House ethics friendly foe Jumbo shrimp After P-30 event designated entrylevel rubber-powered affair P-30 model simple easily built little plane master Scale builder designer decides try hand high-performance model entrylevel event like P-30 end up innovations ideas make own models perform better U Dave Platt Dragon liv P-30 merely average flight performance Most well-trimmed ones will fly minute So violate whole intent aiming higher performance slip Dragonfly Just see what can done thats knew along didnt willing stretch boun daries rules little tinker predictable can get launch climb-out sequence au thor Dave Platt releases Dragonfly P-30 Steep angle rapid climb due very light frame other factors give model its competitive edge Pleasing lines also provide nice deviation tra ditionally square-shaped P-30-class models /1 grams allowed 10 grams rubber power total 50 grams mini mum flying weight Ordinarily course key obtain ing good duration rubber-powered model lies finding optimum marriage prop power As weve seen above however P-30 class both prop dimen sions power fixed Any perform ance enhancement must therefore come airframe design agree Continued page 155 56 Model Aviation evolution Dragonfly VersIon 1 left bit overweight flew well theless lighter version right the plans show really competative w w exciting performance still within P-30 class specifications Dragonfly should thought example what can achieved P-30 rules formula simple No di mension either wingspan overall length may exceed 30 propeller must commercial plastic about 91/2 diameter has altered way airframe whole model less rubber must weigh least 40 Old-Timer Three-Views Featured Columns First Decade 1978 February April June August October 1979 January March May July September 1980 February April August October 1981 January March May September December 1982 April Advanced Challenger Cumulus Shereshaw Pacemaker Ohlsson Quaker Flash Megow Premier Lion British Thermal Magnet Bay Ridge Red Zephyr Scientific Vulcan RussellBritish Utility Hacker American Ace Berkeley Riser Rider Marquardt Streamlined Cyclone Bob Jeffery Scorpion Keil KraftBritish Tubby Joe Weathers Rearwin Speedster Cleveland Hornet Sal Taibi Cavalier Berkeley Mercury IV British Cloud Hopper Schwartz Winged Victory Joe Weathers Snow White 20 Effinger King Burd Burd Models Hoosier Hot-Shot Foxworthy Citizen Bill Winter TD Coupe Dykzeul Bi-Fly Phil Kraft Simplex Paul Plecan Live Wire Bipe Hal deBolt Sunduster Jerry Broffman Dragon Fly Williams Blackhawk Peerless Supply Cloudster Mk Cleveland Pylon Buster Vasquez Commando Ontario Models Lancer New Cyclone Mfg Buzzerd KenHi Pacificoaster Joe Weathers Varsity Scientific Bowden Trophy Winner Krupp Buccaneer Standard Berkeley Nomad Chuck Hollinger Berryloid Winner Hal Coovert MayNimbus Shereshaw JulyLil Misery John Worth September Spook 72 Modelcraft December Hangar 13 Ten-Footer Ralph Beck 1988 February Cloud Cruiser Henry E Moyer AprilGross Wing Bernard Gross June August 1983 January March May July September 1984 January March May July September 1985 February April June October 1986 February April June October 1987 January March RC Pylon Racing/Hager Continued page 54 results Standard Q500l Duane Felstet 2 Dan Powell 3 Darrol Cady 4 Wayne Venetz 5 Ken Helgerson Modified QSOOl Greg Corliss 2 Duane Felstet 3 Earl Seaholm 4 Wayne Venetz 5 AJ Seaholm Formula II Murray Hamula 1240 2 Leon Elbert 130 3 Hans Algard 140 4 Duane Felstet 139 5 Wayne Venetz 157 Heres get kits engines Kits Item Formula Manufact urer PhoneAddress 213 835-1660 Ravenna 4764Wilmington CA 90744 Lit Toni Prather Products Terry Prather Pauls Fly-619 743-PO Box 121 ing Stuff5458Escondido CA Paul92025 Steinberg Ritchs713 661Hobbies5458 4104 Lark Houston TX 77025 12055 206th Issaquah WA 98027 1420 W 160th Seattle WA 98166 502 Cherry Southlake TX 76092 tlenight Spcl Cosmic Wind Pole Cat Dick Ritch Shoestring Don Rice 206 2284170 Shoestring Tom Strom 206 246Lit Toni4258 Estrellita Jerry Small 817 4816456 EnginesStock Supertigre X-40 Superligre X-40 Ritchs Hobbies John Han cock See Above See Above 915 672-PO Box 2694 8568Abilene TX 79604 501 782-4305 Kelley 8506Ft Smith AR 72904 Supertigre Model X-40tronics Terry Rollins K&B 40 K&B Mfg 213 803J&J1423 Brodheck 12152 5 Woodruff Downey CA 90241 EnginesModified Ready Race SupertigrePerform-619 729-PO Box 4003 X-40ance Speci-1658Carlsbad CA alties92008 SupertigreJohn Han-See AboveSee Above X-40cock K&B 40 Lee Custom 813 352-7215 Foothill Engines3766Tujunga CA Clarence90241 Lee Ive missed someone please write Ill try get Next month will list accessor ies Q500 kits Please keep cards letters photos coming Dragonfly/Platt Continued page 56 no-compromises approach building significant gains performance can made So easy building goes out Win dow Still constructing model like Gone forever nightmare heli-flier dreads stepping 3 foot tenna ripping off front prized chopper just its ready fly Base loaded short WHIP ANTENNA gives hidden performance Less 7 long can mounted project front helicopter inside canopy virtually invisible GO5LAAA MODEL PRODUcTs 23961 CRAFTSMAN RD CALABASAS CA 91302 818 992-0195 218 VERNON ROAD GREENVILLE PA 16125 412 588-1321 April 1988 155 RAINBOW RUNNER PURE PERFORMANCE Rainbow Runner delivers total pattern performance 25 45 sizes Designed features pattern champion Rainbow Runner ready meet exceed expectations %fl PRECI SION PRODUCTS INC 114 592-5144 510 E Arrow Highway San Dimas CA 91773 Whip Antenna Gives Hidden Per foranance RADIO SOUTH AUTHORIZED SERVICE CENTERTh Call Sam Leonard Tony Stiliman custom work competition needs stock complete hobby line specializing competition accessoriesall discounted prices Radio South Batteries 500 ma Pack 48V1100 Futaba conn1350 800 ma Pack 48V1950 Futaba conn2275 1200 ma Pack 48V2100 Futaba conn2425 TX batt Futaba G-Series PCM2450 Frequency Conversions ________ t$40 _________-z FutabaAM$30 Futaba FM$40 ProLine/Ace$30 Featuring fast service repair $10 qualified people Mode Change $35 latest equipment inciuding O%OWe Repair Heli Sets SPECTRUM ANAL YZERand Gyros Orders COD VISA MC Ship Charges Only LPricessubject change noticeOPEN 8 5 CST %....... 43 West Nine Mile Rd Pensacola FL 32514 904 478-6745 Dragonfly slightly compli cated time-consuming building standard P-30 Redesigning airframe isnt se cret getting high performance P-30 Other characteristics have factored too First its essential build model down minimum weight allowed rules yours does turn out overweight banish offending part replace P-30 ships built due care matter consequently often weigh 60 70 80 grams flying trim such models duration inevitably suffers Second must ensure plastic propeller forced use least smooth running friction minimized freewheel works perfectly latter regard too common P-30 have faulty freewheel mechanism resulting frozen prop sometimes nose block itself will fall out end power run remain dangling motor Dragonfly built powered exactly plans youll avert both problems either obvi ously has disastrous effects glide Ten grams Y16-in rubber works out about 76 in length before lubricant folded four strands intended length results puts slight tension rubber its completely un wound retains nose block Fur thermore key perfect freewheel solder washer onto prop shaft about 1/4 behind prop Make sure prop spins very freely shaft doesnt wobble motor pul ling shaft rearward washer will next ball-race prop will have plenty room slide rearward until clutch disengaged entirely ensuring good freewheel Third use winding tube rolled bit drafting Mylar will allow wind rubber motor limit fear exploded fuselage Without tube anxiety about possibil ity accident forces prudent wind-up duration suffers Fourth P-30 rules formula limits wingspan wing area fore very low aspect ratio could double benefit As area increased wing loading reduced wing chord raised airfoil should become PRODUCTS Complete Line Exhaust Systems * Tuned Pipes led Tuned Pipes * Headers uri Mufflers Expansion Mufflers copter Ball Mufflers Specialized Exhaust Systems Unsurpaar War efficient Whether exists some practical theoretical limit approach remains yet unproven Dragonflys aspect ratio 67 half typical Wakefield yet may still bordering too low airfoils could have chosen 7% Gard finally selected decision purely arbitrary un doubtedly comparable Benedeks Isaacsons similar brand would have just good Perhaps what settled matter Mr Gard noted recom mended turbulator locations whereas others did reasons may clear have observed fitting upper-surface spars locations seems work just well actual tar bulator performance Dragonfly has given very persuasive results Its glide soft light almost undulating float quite unlike typical 30-in Rubber model sides vastly increasing ordinary still-air du ration such glide makes the weakest lift good air Its always difficult foolhardy quote dead-air times dead air may technically misnomer keep dead air still compare dead air yours Nevertheless can describe typ ical Dragonfly flight follows fast steep upward right spiral about six sec onds followed gradually diminishing climb angle significant further height gain until 35-second mark point rubber unwound model some 150 ft high Easing wide right glide plane lands about 140 150 clock lift youre immediately over two-minute max Two final suggestions Always light DT dont go thinking can fly Dragonfly school playing field lit tle rascal needs some room k know 158 Model Aviation A