Windsurfing...
Is a surface water sport that combines elements of surfing and
sailing. It consists of a board usually 2.5 to 3 meters long, with
displacements typically between 60 and 250 litres, powered by wind
on a sail. The rig is connected to the board by a free-rotating
universal joint and consists of a mast, 2-sided boom and sail. The sail
area generally ranges from 2.5 m2 to 12 m2 depending on the
conditions, the skill of the sailor, the type of windsurfing being
undertaken and the weight of the person wind surfing.