Model of a catamaran-class “P” with a sail-wing. Few people remember that the apparatus used for movements the aerodynamic forces, was created more than five thousand years ago. It was a self-propelled vessel with a sail propulsion, which worked exactly the same as the wing of a modern aircraft. The only difference is that the lift force of the aircraft wing pointing up vertically, and the pulling force of the sail horizontally. In fact, the movement of the sailboat is the same flight, only on the side.
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