| 摘要 |
A wind propelled apparatus in which a mast is mounted on a craft and supports an arcuate boom and a sail therebetween. The position of the mast and sail is controllable and maintained directly by the user and the movement of the mast during use, is confined by pivotal mast support mounted directly to the surface of the craft to only two degrees of freedom, rotation of the mast about its axis and pivotally in a plane perpendicular to the plane of rotation.
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