Paddle propulsion system for boats - has cyclic pitch control of paddle blade pivoted on reciprocating arm on stern of boat

摘要

The boat is propelled by a reciprocating drive on control arms at the ends of which are pivoting paddles. The paddles are fitted with servo controls and linkages which regulate their cyclic pitch. For improved effect the paddles are symmetric about a middle axis. Their pitch can be regulated so that the optimum thrust is obtained at any speed of the boat through the water. - The thrust direction is easily reversed simply by altering the timing sequence, or the connections of the linkage, while the maximum speed of the system is optimised by pivot limits on the paddle linkages.