Abstract: A boat includes two sail surf-board floats, a frame cooperating with each of the floats, a rigid framing comprising at least four fastening lugs to be associated pairwise with each of the frames and so arranged as to retain the frames and thereby the floats substantially in parallel relationship, a seat supported by the framing and so arranged as to receive at least one passenger, a motor driven propeller supported on the framing and so arranged as to drive the boat, and a rudder associated with the framing and so arranged as to steer same.