| 摘要 |
A watercraft including flotation (1) and propulsion members, which propulsion members are two blades (2 and 3) hinged to a float. The floatability factor of the float is such that the volume of water displaced in the submerged position weighs the same as or up to twice as much as the laden craft, whereby, when a pitching motion is imparted to the craft, it moves sinusoidally in and out of the water and the blades (2 and 3) swing back and forth about their respective hinges between abutments, thus urging the craft forwards. |
