U George M Myers 53@ &U7L17 H3% USE ELECTRIC POWER FOR YOUR MULTIENGINE PROJECTS FOR MY FIRST outing since stroke Henry Prew chauffered Quakertown Pennsylvania what has become greatest Electric fun-fly east coast Bob Kopski created motivated event will report detail choose highlight aspect event specifically fact far large multiengine Scale aircraft present noncompetitive KRC event dozen likely seen attending year wet power competitions Obviously some connection between multiengine Scale Electric motors should investigate connection well-known twin-engined man-carrying aircraft dangerous singles engine stops flight usual asymmetrical thrust situation requires compensating rudder deflection creates drag wastes some remaining power pilot left less half power twins cant maintain altitude engine difficult decide engine has stopped model full-scale airplane See RCM October 1993 pp 178-81 full-scale pilot feels dead engine through feet foot needs increase pressure keep airplane straight side running engine other dead foot feels nothing same side stopped engine RC pilots dont have feedback significant point Electric motor failures rare Lets examine some ways electric circuits configured multiengine use way use independent power packages gearbox engine power pack fuse power controller propeller see Figure 1 Very few Electric models configured multiple parallel independent power packages Ken Stinsons KC-130 uses four independent special motors wired parallel powered single battery power controller flies very realistically Fred cautions us electric motor different run record characteristics sort appropriate nacelle order produce balanced-thrust situation 76 Model Aviation mart FIG 1 Basic wiring scheme Multi Parallel Option 1 Replicate nacelle FIG 2 Series wiring scheme Add motor assembly battery pack per nacelle F FIG 3 Kress belt-drive scheme Area 839 square inches weight 85 pounds uses four Pitman motors six amps 20 VDC driving Zinger 9 x 6 props modified fourblade configuration think drive system important innovation albeit available commercially common have power controller engines needed equal number power packs wired series see Figure 2 Tom Hunts Pucara has two ferrite 05 motors series 14 cells Jomar SM-4 controller drive two 11 x 9 propellers through 21 gearboxes Art Thoms Boeing 314 Yankee Clipper spans 114 inches weighs 144 156 pounds depending batteries powered four geared Astro OSs swinging 10 x 6 Grish three-bladed props two clockwise two counterclockwise series connected propellers turned same way first flight fought strong left turn effect change opposite rotations cured problem Filters designed Cliff Schaible cured interference problems generated distributed wiring aluminized Micafilm covering Bob Kress Kress Jets Saugerties New York takes different path Beech D-18 Lockheed P-38 driven small electric motor fuselage belt-connected two propellers nacelles see Figure 3 case P-38 Astro 035 eight cells drives two 9 x 7 props through 34 belt reduction ratio Beech C-iS uses Graupner 84volt Speed 600 nine cells driving two 9 x 6 props via 31 belt reduction Ive shown four different ways drive multi-propeller models main points reliability electric motors ease getting several work together supports argument best power system multi-propeller models electric examples have shown did exhaust models flown KRC Dr Keith Shaw brought 11-foot-span four-motor flying wing twinmotor DH-88 London-Melbourne racer see column September 1990 page 38 well twin-motor ducted-fan Horton flying wing see box Secret Weapons Luftwaffe Toledo report MA August 1992 page 22 Keith Mey brought beautiful B-17 did Joe Beshar District II VP Keith now doing business MDK Productions White Pond Road Stormville NY 12582 producing fiberglass WW LI Electric gaspowered model airplanes Paul McEntarfer brought Ford Tn-motor MA August 1993 page 18 Tom Hunt brought P-82 Twin Mustang Also present Don Bousquet Narragansett Rhode Island Consolidated PBY Catalina Dornier twin-engine commuter airliner Douglas C-47 Gooney Bird perhaps others missed Im trying report multiengine airplanes present KRC Electric Fly just directing attention fact seldom see multiengine aircraft wet~ power meeting due engine problems dont exist Electrics 4February 1994 77 Clyde Geist holds Electric Aquila control check Bethpage Polo Field Authors first flight after stroke Ken Stinson KC-1 30 flew realistically four special motors power pack New Jerseys Art Thorns Boeing 314 Yankee Clipper KRC Electric Fly Eleven flights date H Prew photo Also seen KRC Keith Mey Electric B-17 Electric Fly held Quakertown Pennsylvania
Edition: Model Aviation - 1994/02
Page Numbers: 76, 77
U George M Myers 53@ &U7L17 H3% USE ELECTRIC POWER FOR YOUR MULTIENGINE PROJECTS FOR MY FIRST outing since stroke Henry Prew chauffered Quakertown Pennsylvania what has become greatest Electric fun-fly east coast Bob Kopski created motivated event will report detail choose highlight aspect event specifically fact far large multiengine Scale aircraft present noncompetitive KRC event dozen likely seen attending year wet power competitions Obviously some connection between multiengine Scale Electric motors should investigate connection well-known twin-engined man-carrying aircraft dangerous singles engine stops flight usual asymmetrical thrust situation requires compensating rudder deflection creates drag wastes some remaining power pilot left less half power twins cant maintain altitude engine difficult decide engine has stopped model full-scale airplane See RCM October 1993 pp 178-81 full-scale pilot feels dead engine through feet foot needs increase pressure keep airplane straight side running engine other dead foot feels nothing same side stopped engine RC pilots dont have feedback significant point Electric motor failures rare Lets examine some ways electric circuits configured multiengine use way use independent power packages gearbox engine power pack fuse power controller propeller see Figure 1 Very few Electric models configured multiple parallel independent power packages Ken Stinsons KC-130 uses four independent special motors wired parallel powered single battery power controller flies very realistically Fred cautions us electric motor different run record characteristics sort appropriate nacelle order produce balanced-thrust situation 76 Model Aviation mart FIG 1 Basic wiring scheme Multi Parallel Option 1 Replicate nacelle FIG 2 Series wiring scheme Add motor assembly battery pack per nacelle F FIG 3 Kress belt-drive scheme Area 839 square inches weight 85 pounds uses four Pitman motors six amps 20 VDC driving Zinger 9 x 6 props modified fourblade configuration think drive system important innovation albeit available commercially common have power controller engines needed equal number power packs wired series see Figure 2 Tom Hunts Pucara has two ferrite 05 motors series 14 cells Jomar SM-4 controller drive two 11 x 9 propellers through 21 gearboxes Art Thoms Boeing 314 Yankee Clipper spans 114 inches weighs 144 156 pounds depending batteries powered four geared Astro OSs swinging 10 x 6 Grish three-bladed props two clockwise two counterclockwise series connected propellers turned same way first flight fought strong left turn effect change opposite rotations cured problem Filters designed Cliff Schaible cured interference problems generated distributed wiring aluminized Micafilm covering Bob Kress Kress Jets Saugerties New York takes different path Beech D-18 Lockheed P-38 driven small electric motor fuselage belt-connected two propellers nacelles see Figure 3 case P-38 Astro 035 eight cells drives two 9 x 7 props through 34 belt reduction ratio Beech C-iS uses Graupner 84volt Speed 600 nine cells driving two 9 x 6 props via 31 belt reduction Ive shown four different ways drive multi-propeller models main points reliability electric motors ease getting several work together supports argument best power system multi-propeller models electric examples have shown did exhaust models flown KRC Dr Keith Shaw brought 11-foot-span four-motor flying wing twinmotor DH-88 London-Melbourne racer see column September 1990 page 38 well twin-motor ducted-fan Horton flying wing see box Secret Weapons Luftwaffe Toledo report MA August 1992 page 22 Keith Mey brought beautiful B-17 did Joe Beshar District II VP Keith now doing business MDK Productions White Pond Road Stormville NY 12582 producing fiberglass WW LI Electric gaspowered model airplanes Paul McEntarfer brought Ford Tn-motor MA August 1993 page 18 Tom Hunt brought P-82 Twin Mustang Also present Don Bousquet Narragansett Rhode Island Consolidated PBY Catalina Dornier twin-engine commuter airliner Douglas C-47 Gooney Bird perhaps others missed Im trying report multiengine airplanes present KRC Electric Fly just directing attention fact seldom see multiengine aircraft wet~ power meeting due engine problems dont exist Electrics 4February 1994 77 Clyde Geist holds Electric Aquila control check Bethpage Polo Field Authors first flight after stroke Ken Stinson KC-1 30 flew realistically four special motors power pack New Jerseys Art Thorns Boeing 314 Yankee Clipper KRC Electric Fly Eleven flights date H Prew photo Also seen KRC Keith Mey Electric B-17 Electric Fly held Quakertown Pennsylvania