FREE FLIGHT DURATION Last month mentioned instant-start delayed prop release DPR systems almost standard equipment todays Wakefield rubber models allow one-handed launch wasted turns Tom McLaughlan Memorial Contest Pensacola last June chance take close look John ODwyers DPR-equipped Coupe Johns DPR system simple adaptation stock Winterhawk kit hub John designed Heres works keep blades out run position launch John uses simple wire latch attached blade free end wire bent open loop hooks over screw head added aluminum hub wires holds blades slight sweepback As soon blades start turning centrifugal force pushes blades straight out wires spring off screws out way After rubber motor runs down prop folds normally Most Wakefieldsize DPR hubs use much complicated system feathers blades launch reduced drag eliminate roll pitched blades would introduce John has opted simple external release hold prop until launch consists L-shaped arm mounted aluminum nose ring cable running pylon-mounted timer holds arm out blocks prop hub cable released arm pivots out way allowing prop start turning John uses modified button timer DPR auto stab auto rudder dethermalizer DT button timer uses drag impeller turning viscous fluid instead clockwork system rubber band DT line powers timer place coil spring Tomy-based clockwork timer such sold FAI Model Supply would good alternative important thing type DPR instant-start system make sure works time Remember wound rubber motor puts some extra loads system might cause binding other failure Ground-test fully wound motor before trying launch using DPR system set delay absolute minimum amount work way up until prop starts peak launch Several years ago watched Eugene Gorban practicing DPR launch simply hooked DT line up prop release arm timer model would DT after about nd launched model motor unwound straight up went up 20 feet DTd feet try dont try catch model much safer simply let DT Tall grass would always nice kit version John ODwyers Winterhawk Coupe available Model Aircraft Labs 108 5 Lee St Irving TX 75060 kit features prerolled balsa fuselage Montrealtype hub spinner molded balsa prop blades redi-cut ribs cost $55 postpaid Texans will have add 825% sales tax Note kit does include DPR system shown photos could easily added C Cs F1J same contest also got take look C C Johnsons latest F1J power model model powered 1cc AD engine swinging one-bladed folding prop tapered round fuselage consists multiple layers four-ounce glass cloth laid up over pool cue mandrel CC uses two layers cloth rear portion fuselage adding third layer front half fourth layer about wing trailing edge forward provides extra strength fairing Rohacell foam fiberglass provides streamlining 340-square-inch wing uses balsa D-box diagonal aft ribs CC said next version would use narrow carbon-fiber D-box added strength All-up weight model 102 ounces way AD engines other F1J accessories available Bill Lynch 1137 Creekhaven Ct Auburn CA 95602 Send stamped self-addressed envelope catalog Folders mention Russian folding-wing power model column few months back prompted letter Jim Adams about some much earlier folders After launch centrifugal force throws blades straight out hold wound motor until launch simple 1-shaped arm allowing wire arms slip off screw heads spring-loaded push back against screw stop November 1997 115 John ODwyers Coupe hub uses simple DPR system holds blades slight sweepback hit wing launch remember early 1940 Ralph Baker developed folding wing area-increasing wings Ralphs wings folded under attached fuselage airfoil flat bottom wings extended symmetrical folded models rubber powered area doubled wings extended Ralph sold article plans Mechanix Illustrated magazine published 1940 41 attempt area-increasing model design complicated panels sliding top other upper wing wheels ran tracks built inside lower surface looked good paper proved too difficult make work always dreamer addicted overly complex designs did build twin-propeller tractor rubber model motors enclosed large airfoil-shaped fuselage sported retractable EDO floats whole thing weighed five ounces surprisingly didnt win contests thing am sure would have received kudos Mr Burnelli famous flying fuselage designer seen thing finally got design something complicated worked Rockwell International years designed very successful Window Conditioning System NASA Space Shuttle Jims Ralphs models sound interesting Perhaps someone has saved back issue Mechanix Illustrated could make interesting probably controversial Old-Timer rubber model ian-made AD engine displaces 1 cubic centimeter 061 cubic CC Johnsons F1J uses homemade fiberglass fuselage balsa inches maximum size allowed F1J event D-box wing Wing area 340 square inches 102 ounces 116 Model Aviation F1J models uses timer-controlled auto surfaces allow separate control climb glide Pylon-mounted timer based popular Button timer Note added Delrin disk sponge rubber pad under wire lever
Edition: Model Aviation - 1997/11
Page Numbers: 115, 116
Edition: Model Aviation - 1997/11
Page Numbers: 115, 116
FREE FLIGHT DURATION Last month mentioned instant-start delayed prop release DPR systems almost standard equipment todays Wakefield rubber models allow one-handed launch wasted turns Tom McLaughlan Memorial Contest Pensacola last June chance take close look John ODwyers DPR-equipped Coupe Johns DPR system simple adaptation stock Winterhawk kit hub John designed Heres works keep blades out run position launch John uses simple wire latch attached blade free end wire bent open loop hooks over screw head added aluminum hub wires holds blades slight sweepback As soon blades start turning centrifugal force pushes blades straight out wires spring off screws out way After rubber motor runs down prop folds normally Most Wakefieldsize DPR hubs use much complicated system feathers blades launch reduced drag eliminate roll pitched blades would introduce John has opted simple external release hold prop until launch consists L-shaped arm mounted aluminum nose ring cable running pylon-mounted timer holds arm out blocks prop hub cable released arm pivots out way allowing prop start turning John uses modified button timer DPR auto stab auto rudder dethermalizer DT button timer uses drag impeller turning viscous fluid instead clockwork system rubber band DT line powers timer place coil spring Tomy-based clockwork timer such sold FAI Model Supply would good alternative important thing type DPR instant-start system make sure works time Remember wound rubber motor puts some extra loads system might cause binding other failure Ground-test fully wound motor before trying launch using DPR system set delay absolute minimum amount work way up until prop starts peak launch Several years ago watched Eugene Gorban practicing DPR launch simply hooked DT line up prop release arm timer model would DT after about nd launched model motor unwound straight up went up 20 feet DTd feet try dont try catch model much safer simply let DT Tall grass would always nice kit version John ODwyers Winterhawk Coupe available Model Aircraft Labs 108 5 Lee St Irving TX 75060 kit features prerolled balsa fuselage Montrealtype hub spinner molded balsa prop blades redi-cut ribs cost $55 postpaid Texans will have add 825% sales tax Note kit does include DPR system shown photos could easily added C Cs F1J same contest also got take look C C Johnsons latest F1J power model model powered 1cc AD engine swinging one-bladed folding prop tapered round fuselage consists multiple layers four-ounce glass cloth laid up over pool cue mandrel CC uses two layers cloth rear portion fuselage adding third layer front half fourth layer about wing trailing edge forward provides extra strength fairing Rohacell foam fiberglass provides streamlining 340-square-inch wing uses balsa D-box diagonal aft ribs CC said next version would use narrow carbon-fiber D-box added strength All-up weight model 102 ounces way AD engines other F1J accessories available Bill Lynch 1137 Creekhaven Ct Auburn CA 95602 Send stamped self-addressed envelope catalog Folders mention Russian folding-wing power model column few months back prompted letter Jim Adams about some much earlier folders After launch centrifugal force throws blades straight out hold wound motor until launch simple 1-shaped arm allowing wire arms slip off screw heads spring-loaded push back against screw stop November 1997 115 John ODwyers Coupe hub uses simple DPR system holds blades slight sweepback hit wing launch remember early 1940 Ralph Baker developed folding wing area-increasing wings Ralphs wings folded under attached fuselage airfoil flat bottom wings extended symmetrical folded models rubber powered area doubled wings extended Ralph sold article plans Mechanix Illustrated magazine published 1940 41 attempt area-increasing model design complicated panels sliding top other upper wing wheels ran tracks built inside lower surface looked good paper proved too difficult make work always dreamer addicted overly complex designs did build twin-propeller tractor rubber model motors enclosed large airfoil-shaped fuselage sported retractable EDO floats whole thing weighed five ounces surprisingly didnt win contests thing am sure would have received kudos Mr Burnelli famous flying fuselage designer seen thing finally got design something complicated worked Rockwell International years designed very successful Window Conditioning System NASA Space Shuttle Jims Ralphs models sound interesting Perhaps someone has saved back issue Mechanix Illustrated could make interesting probably controversial Old-Timer rubber model ian-made AD engine displaces 1 cubic centimeter 061 cubic CC Johnsons F1J uses homemade fiberglass fuselage balsa inches maximum size allowed F1J event D-box wing Wing area 340 square inches 102 ounces 116 Model Aviation F1J models uses timer-controlled auto surfaces allow separate control climb glide Pylon-mounted timer based popular Button timer Note added Delrin disk sponge rubber pad under wire lever
