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force component in the direction of the apparent wind--and lift--the force component normal (90°) to the apparent wind. Depending on the alignment of the sail with the apparent wind, lift or drag may be the predominant propulsive component. Total aerodynamic force also resolves into a forward, propulsive, driving force--resisted by the medium through or over which the craft is passing (e.g. through water, air, or over ice, sand)--and a lateral force, resisted

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