The present invention relates to a mast provided on a hull having an upper boom and a lower boom for loops provided on the upper side of the hull, and a lower boom for mediating a sail, wherein one end of the mast is rotatably installed on the hull, And a second member (55) accommodated in the first member so as to be slidable in the vertical direction, wherein an upper end of the second member of the mast is fixedly connected to the upper boom, A rack protrusion 55a fixedly connected to the first member of the mast and vertically extending in a predetermined region of the outer circumferential surface of the second member, and a pinion 55b rotating in engagement with the rack protrusion, And the second member is moved up and down by the rotation of the pinion. According to the present invention, the mast can be moved effectively and the solar energy and the wind force can be used at the same time, so that the eco-friendly energy can be operated with the driving force. The present invention is based on the idea that the solar cell module mounted on the ship is very wide And the tilting and the like can produce sufficient energy by rotating the tilting lamp and the like. The present invention also has the effect of providing a steering means for efficiently utilizing the force of the wind and allowing the user to easily adjust the sail .
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