| 摘要 |
A propeller propulsion unit comprising a prime mover, propellers, and rotating force transmission for transmitting the rotating force of the prime mover to the propellers, wherein a counter propeller is fixed to a main shaft and a forward propeller is mounted to be rotatable on the main shaft, and these propellers are rotated in the directions reverse to each other by a belt transmission mechanism having forward and reverse running belts, whereby a lightweight moving body susceptible to an effect by a torque reaction can be steered stably.
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