Patent ID: 8117978
Filing Date: 2012-02-21
Classification: B63B,B63H

Abstract:
1. A sailing ship comprising: (a) a hard sail assembly comprising a plurality of hard sails of wing-shaped hollow cross section vertically stacked so that each sail, except a lowermost sail, is received in the one immediately below, wherein each hard sail is provided with members for maintaining the wing-shaped hollow cross section at a lower end and near an upper end, wherein the member near the upper end is a frame surrounding an outer circumferential surface of the hard sail, and the frame abuts the upper end of the hard sail immediately below to prevent downward movement of the hard sail relative to the hard sail immediately below; (b) a first means for driving the plurality of hard sails to move each sail, except the lowermost sail, toward and away from the one immediately below; (c) a post extending vertically to support the lowermost hard sail; and (d) a second means for rotating the post around a longitudinal axis, wherein overlapping lengths between vertically adjacent hard sails are variably controlled to make the hard sail assembly expand and contract vertically.