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Boom (sailing)
In sailing, a boom is a spar (pole), along the foot (bottom edge) of a fore and aft rigged sail, that greatly improves control of the angle and shape of the sail. The primary action of the boom is to keep the foot of the sail flatter when the sail angle is away from the centerline of the boat. The boom also serves as an attachment point for more sophisticated control lines. Because of the improved sail control it is rare to find a non headsail without a boom. In some modern applications, the sail is rolled up into the boom for storage or reefing (shortening sail).
== Boom attachment ==
The forward end of the boom attaches to a mast just below the sail, with a joint called the gooseneck. The gooseneck pivots allowing the other end of the boom to move freely. The clew (back corner) of the sail attaches to the free end of the boom. The entire foot of the sail may be attached to the boom or just the clew. If the foot is not attached to the boom, the rig is known as loose footed.
A boom may be found on small headsails. There the forward end of the boom is attached to the same stay as the sail's luff (forward edge).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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