Aeronautics and astronautics – Aircraft power plants – Arrangement
Patent
1981-12-14
1984-12-18
Barefoot, Galen L.
Aeronautics and astronautics
Aircraft power plants
Arrangement
244 60, B64D 3100
Patent
active
044886926
ABSTRACT:
A vehicle like an aircraft or ship uses multiple propeller pairs to drive the vehicle. One propeller of each pair is located on one side of the vehicle and the other propeller of the same propeller pair on the other side of the vehicle. The propellers of each pair may revolve in opposite directions. A hydraulic transmission transfers the power from the power plant to the propellers, which are driven by hydraulic fluid motors of the transmission. The transmission forces each propeller of the same pair of propellers to revolve with equal rotary velocity relatively to the other propeller of the same pair. Propellers of different pairs have different pitches or sizes. Thereby the propellers use different powers at different speeds of the vehicle. Since the power plant drives a common transmission, the power supply to one of the pairs varies compared to the power supply to the other pair, when the vehicle travels at another speed. The variation of the rate of power supplied to the different propeller pairs varies automatically in such a way that the vehicle runs at different speeds with good efficiency because each propeller pair receives a suitable portion of power at the respective speed of the vehicle.
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