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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%-30% of the airfoil's chord length (meaning that 25% of wing area is fore of the mast).
In order to also suit large boats, the wing is made of three different sails. Each of the sails is hoisted and reefed independently. The sails are hoisted along tracks attached to the spreaders ends (see pictures in the gallery). Once all three sails are up - you get a wing.
The selected airfoil shape of the wing is effected by the spreaders and tracks assembly, that enable hoisting a U shape fully battened leading edge sail (see pictures), and keep the right distance of the wing's port main sail from the starboard main sail.
The lower leading edge is fixed to the lower spreader and to a small strut that goes fore of the mast. The wing's trailing edges (the leech of the two main sails) are attached to the boom.
A small electric or hydraulic ram induces wing's camber by changing the angle between the mast and the boom (in smaller boats, change of camber from one side to the other is automatically done by a hinge at mid boom. Control of wing's camber and airfoil asymmetry is done by pulling a rope that changes the hinge angle). 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 100-120 Angle of Attack, you are off...
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