PostHeaderIcon Backwind

— 1) Wind that pushes against what would typically be considered a sail’s leeward side. For example, when a boat is tacking, the jib is allowed to backwind momentarily before the working sheet is released, to help the sail move through the foretriangle. One sail backwinds another when it directs its wind onto the other sail’s leeward side. For example, the bubble that forms near a mainsail’s luff caused by wind deflecting off the leech of an overlapping genoa’s windward side when the slot is too closed. See also: speed bubble. 2) The turbulent air exiting the leech of a boat’s sails and extending to leeward. See also: wind shadow.

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