| 摘要 |
Watercraft propulsion by muscle power. With a greater transmission ratio through a second bearing, only the movement which is most effective for the power transmission is made. In this case, longer crank arms can be used so that the propulsion is faster and easier. With accessories, the watercraft can be changed over from foot operation to hand operation and vice versa. The watercraft can be easily transported due to the flat, light type of construction.
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