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On points of sail where it is possible to align the leading edge of the sail with the apparent wind, the sail may act as an airfoil, generating propulsive force as air passes along its surface—just as an airplane wing generates lift—which predominates over aerodynamic drag retarding forward motion.

The more that the angle of attack diverges from the apparent wind as a sailing craft turns downwind, the more drag increases and lift decreases as propulsive forces, until a sail going downwind is predominated by drag forces.

Sailing craft employ two types of rig, the square rig and the fore-and-aft rig.

The square rig carries the primary driving sails are carried on horizontal spars, which are perpendicular or square, to the keel of the vessel and to the masts.

When these areas wear through (you will start to see through the applied 11 years earlier.

The owners had spent 10 years in the Caribbean before sailing north to Newport, RI where they hauled out to do some other work and to touch-up around the waterline and a small spot on the leading edge of the keel.

They are typically raised by a line, called a halyard, and their angle with respect to the wind is usually controlled by a line, called a sheet.

In use, they may be designed to be curved in both directions along their surface, often as a result of their curved edges.

Other non-rotating airfoils that power sailing craft include wingsails, which are rigid wing-like structures, and kites that power kite-rigged vessels, but do not employ a mast to support the airfoil and are beyond the scope of this article.These spars are called yards and their tips, beyond the last stay, are called the yardarms where reed boats sailed upstream against the River Nile's current.Ancient Sumerians used square rigged sailing boats at about the same time, and it is believed they established sea trading routes as far away as the Indus valley.Sails may be made from a combination of woven materials—including canvas or polyester cloth, laminated membranes or bonded filaments—usually in a three- or four-sided shape.A sail provides propulsive force via a combination of lift and drag, depending on its angle of attack—its angle with respect to the apparent wind.

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