The Willdo Jet Thrusters are driven hydraulically (not electrically) by the propulsion engine for boat. A hydraulic pump, which is fitted onto the propulsion engine, drives an hydraulic motor, located in the pump housing, which in turn activates a marine water pump, that sucks in the water through an opening in the bottom of the sailboat boat and presses it wih great force, via hoses with an inside diameter of no more than 45mm, to the nozzles in the sides of the boat.