Abstract: An oarlock horn member is supported, at an appropriate tilt, above a base plate from a winch such as is commonly used on each side of the cockpit of a sailboat. The underside of the base plate has a locking type plug of the kind used to engage and lock in a winch handle for cranking the winch. When the winch is not in use for trimming sails, it can be converted into an oarlock pivot by locking in the present oarlock, to provide auxiliary propulsion for small cruising sailboats for use in calm weather or for maneuvering in harbors, either when the sailboat is not equipped with an engine, or when the engine is out of fuel, or otherwise out of service, or in sailboat races that permit rowing in order to enliven calm weather contests.

Abstract: In a twin hull boat, a rudder mounted in the space between the hulls and forward of the middle of the boat is connected to the rudder or rudders at or near the stern of the boat for deflection in the direction opposite to that of the stern rudder or rudders, the deflection being relatively less, the closer the forward rudder is to the middle of the boat. In a trimaran, a forward rudder is provided on each side of the main hull in the space between the main hull and the outer hull and these rudders are similarly linked to the movement of the rudder at or near the stern of the main hull. Laterally offset rudders, the forward rudders in the case of a trimaran, and aft rudders on the respective hulls of a catamaran, are so interconnected in the steering system that whichever rudder is on the inside of a turn being performed, it is given a greater deflection than the rudder on the outside of the turn.