US Patent 7556544 Dual propulsion steering and control system for watercraft

A dual propulsion steering and control system for a watercraft which utilizes simple movement of an operator's feet to independently vary thrust from a pair of propulsion units, each mounted on opposite sides of the centerline of a watercraft. By varying the amount and direction of thrust on each side, the watercraft may be steered in a multitude of directions, propelled at varying speeds, and turned completely around in a short distance.