| 摘要 |
A boat is provided to remarkably enhance driving force of the boat and manufacture the boat having desired driving force. A boat includes a pedal(8), a pedal gear(9), a plurality of middle gears(10,11,12,13,14,15), and a rear wheel gear(16). The pedal gear is connected to the pedal. The pedal gear is engaged with one or more middle gears. The plurality of middle gears rotate while being engaged with the rear wheel gear. The two middle gears forms one group which functions as one gear. A pair of bevel gears are installed at a screw to transmit power.
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