Wingspan-variable keel for unmanned sailboat

The invention provides a wingspan-variable keel for an unmanned sailboat, and particularly relates to the technical field of ship engineering. The device comprises a keel, a driving motor and a wingspan control mechanism, the keel comprises a fixed end and a wingspan end embedded in the fixed end, the wingspan control mechanism comprises a first transmission rod, a second transmission rod, a third transmission rod, an inner gear, an outer gear and a driving motor, and the inner gear is arranged in the outer gear and coincides with the circle center of the outer gear; the second transmission rod and the third transmission rod are arranged on the two sides of the inner gear respectively, one end of the second transmission rod is fixed to the edge of the inner gear, the other end of the second transmission rod is connected with the top end of the first transmission rod, and the bottom end of the first transmission rod is fixed to the wingspan end. One end of the third transmission rod is fixed at the center of t