A STUDY OF TWIN-ENGINE AIRPLANE PROPELLER INTERCONNECTION.
KAMAN AIRCRAFT CORP BLOOMFIELD CONN
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A feasibility study was made of cross-shafting systems which would interconnect propellers of light, twin-engine airplanes, eliminating asymmetric thrust caused by single-engine failures. The study found conventional engine-propeller arrangement, with interconnection added, superior to fuselage-mounted multiengine drive of interconnected wing-mounted propellers. On the basis of a comparative evaluation of a number of aircraft and engines, the Aero Commander 680F was selected for modification analysis. Compared to an unmodified aircraft, two-engine performance decreases slightly, but the important single-engine climb performance is increased by 70 feet per minute and the distance to take-off and climb to an altitude of 50 feet, assuming an engine failure at 100 miles per hour, is reduced by 317 feet. Reliability analysis shows that interconnection, on the average, will eliminate approximately six accidents while adding one, a reduction of 84 percent of those accidents associated with engine failure. It is concluded that this concept is feasible and makes a significant contribution to flight safety. Author