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 A free-standing, rotating carbon fiber mast, is fixed to the boat (at the same location of a standard rig) by a ball at  the bottom and a roller bearing on deck.

The airfoil shaped wing is made of conventional fully battened sailcloth, and is attached to the mast at about 25% of the airfoil's chord length (meaning that 25% of wing area is fore of the mast).

The wing is made of three different sails - Two main sails aft of the mast, and one leading edge U shape sail fore of the mast. Each of the sails is hoisted and reefed and dropped down independently.

The sails are hoisted along tracks attached to the "legs" of the mast, at both port and starboard sides (see picture No.4 in the gallery). Once all three sails are up - you get a wing.

The A frame mast enables hoisting the fully battened U shape leading edge sail, and keeps the right distance of the  wing's port main sail from the starboard main sail. 

The bottom of the leading edge sail is fixed to a kind of forward small U shape boom. The wing's trailing edges (the leech of the two main sails) are attached to the boom like any other standard main sail.

A small electric or hydraulic ram induces wing's camber by changing the angle between the mast and the boom. Since the camber is induced by the boom at wing's bottom, the wing's trailing edge is spontaneously twisted to a "0" camber (symmetrical airfoil) at the top of the wing.

When the wing is hoisted, the mast and the wing rotate spontaneously (weather-cocking) into the wind.

By slightly sheeting in to 00-50  Angle of Attack, off you are...


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