Abstract: A propulsion system for a water-borne vessel. There is a generally inflexible fin member. A projection member is connected to the vessel. It has a resilient connecting member attached to the generally inflexible fin member. The projection member is connected to the vessel so as to be held below water along an axis parallel to the water line.

Abstract: A propulsion unit comprises an elongated chamber having a front closed end and a rear open end with a side opening having a decreasing cross section inwardly of the chamber and directing incoming fluid tangentially of curved internal chamber walls for imparting a spin motion to such fluid for immediately redirecting fluid motion into an inwardly spiraling and longitudinally spreading flow outwardly of the open chamber end to propel the chamber forwardly. The unit operates with random wave motion as well as with expanding gases from a combustion chamber.

Abstract: A watercraft is provided with a propulsion system having a hydraulic power plant driving a propeller through a transmission. The power to operate hydraulic pumps in the power plant is derived from wave motion by buoyant members connected to the power plant by outrigger arms. Undulation of the waves is converted to fluid pressure by the vertical movement of the buoyant members reciprocating pistons in the hydraulic pumps. Pressurized fluid is applied to a fluid motor driving the transmission. A steering assembly is operatively associated with one of the buoyant members.

Abstract: A wave-propelled marine vessel is advanced by rising and falling water currents acting on pivotable fins located on submerged outer fin assemblies, and on other fins on a submerged central fin assembly. The outer fin assemblies are adjustably positioned to be integral wave lengths apart to maximize forward propulsion efficiency.

Abstract: A device is constructed to convert wave energy to drive an output shaft in rotation. The output shaft can be connected to a nautical vehicle propulsion system or to a power generation system. A float rides upon the undulating surface of a body of water and is connected by a float lever arm which extends radially from a rocker shaft that is rotatably mounted in a frame located on a vessel or platform on a body of water. The rocker shaft undergoes reciprocating arcuate movement in response to movement of the float upon the undulating water surface. A pair of unidirectional clutch mechanisms are coupled to the rocker shaft and to a drive shaft which is also rotatably mounted on the frame. The unidirectional clutches are alternatively connected to turn the drive shaft in a single direction of rotation responsive to movement of the rocker shaft in both directions of rotation.

Abstract: A boat having an external float pivotally fixed to the boat. Through linkage, the motion of the float relative to the boat resulting from wave motion drives a dual cylinder pump. The pump admits water from the body of water in which the boat is suspended and pressurizes that water for direction aft as a means for propulsion.

Abstract: A water wave energy transducer comprises a boat having pivoted arms projecting out over the water, a float being mounted on the outboard end of each arm so that the arms are oscillated by wave action on the floats. Drive sprockets fixed on the arms coaxially with their pivots are connected by drive chains with two driven sprockets coaxial, respectively, with two gears which mesh with one another and one of which meshes with an output gear. The driven sprockets are coupled with the coaxial gears by one-way clutches which are oppositely arranged so that one drives when the sprockets turn in one direction and the other drives when the sprockets turn in the opposite direction. Hence, the output gear is driven in the same direction by both upward and downward movement of the floats. The output gear is connected by a speed increasing gear train with an electric generator which can supply current to a motor for propelling the boat, or through a cable to the shore when the boat is anchored.

Abstract: A wave motor for propulsion of a floating device, especially a watercraft, comprises a downwards extending supporting structure connected to the craft. An essentially horizontally disposed, plate-like tilting element, at a forwrad portion thereof as viewed in the cruising direction, is pivotally connected to the lower end of the supporting structure. This arrangement results in a tilting movement as a result of relative movement between the tilting element and the surrounding water when the craft is floating on the water and is raised and lowered due to wave action, the tilting movement being limited by upper and lower stops arranged on the supporting structure. The supporting structure is arranged to effect an essentially vertical, relative movement in relation to the craft, and is maintained in an intermediate position and returned to this position when it has been moved away from the intermediate position by influence of wave forces.

Abstract: A wave energy propelling marine ship comprises a cylindrical ship body having a hollow space therein for transporting fluid material therewithin, a ship body disposed in or on the sea; a propeller attached to the ship body for the purpose of propelling the marine ship for sailing; a rudder for controlling the moving direction of the marine ship; at least one rotary device which includes a plurality of compartments which are each partitioned into a plurality of water chambers by a plurality of radial plates, and a plurality of water charge and/or discharge ports, wherein wave energy is converted into mechanical energy; and device for adjusting buoyancy of the marine ship so that the rotary device is positioned advantageously on the sea surface.

Abstract: There is disclosed an improvement in wave motors for propulsion of boats, of the type comprising a supporting structure connected to the boat and extending downwards into the water, and a tilting element connected to the supporting structure, the tilting element being adapted to tilt when the boat is moved by the waves. The motor according to the invention is provided with force applying devices always trying to bring the tilting element back into a neutral position when it is angularly displaced away from this, thereby increasing the efficiency of the wave motor.