Abstract: A sailing rig which comprises a rigid airfoil, with intakes on either side of its front. Air is drawn through the leeward intake into a front compartment, then by fan to a pressurized rear compartment, where it exits via a rearwardly directed jet nozzle on the airfoil's trailing edge. The airfoil may have an articulated jib and a pivotable jet nozzle.

Abstract: A rigid or semirigid sailing rig having an airfoil shaped mainsail, hinged at its luff to an airfoil shaped jib pivotable at the hinge axis 25.degree. to either side of the mainsail's centerline to form a continuous airfoil which is smoothly curved on the lee side and relatively flat on the windward side. The airfoil is mounted between two end plates and the entire assembly is rotatable 360.degree. relative to the ship and on an axis of rotation slightly jibward of the center of wind pressure upon the airfoil assembly.

Abstract: Wind-assisted power elements comprising paired rotors of which each rotor is independently rotated at a peripheral speed of about 2 to 4 times that of the wind, and the rotors are mounted in tandem pairs in a frame positioned by rotation of the frame on a pivot to the apparent direction of the wind and adjustable for a variable angle of attack, so that the wind will flow in a series over both rotating, generally cylindrical rotor surfaces. The effect is to derive a maximum of forward thrust in the direction of the movement of the ship for propulsion, or when the rotors are driven independently in different directions, a steering or other effect is achieved.