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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.
The foot of a Bermuda sail may be attached to the boom along its length, or in some modern rigs the sail is attached to the boom only at its ends. This modern variation of a Bermuda mainsail is known as a loose-footed main. In some early Bermudian vessels, the mainsails were attached only to the mast and deck, lacking booms.
However, under sail on a given tack, the corner to which the spinnaker sheet is attached is called the clew, and the corner attached to the spinnaker pole is referred to as the tack. [20] Tack – The tack is the corner on a fore-and-aft sail where the luff and foot connect [8] and, on a mainsail, is located where the boom and mast connect.
Edges: Luff Head Leech Foot Corners: Tack Throat Peak Clew Diagram of a four-cornered spritsail. The spritsail is a four-sided, fore-and-aft sail that is supported at its highest points by the mast and a diagonally running spar known as the sprit. The foot of the sail can be stretched by a boom or held loose-footed just by its sheets.
When sailing downwind the kicking strap (kicker) is tensioned to stop the boom lifting. [1] Cunninghams, which tighten the luff of a boom-footed sail by pulling downward on a cringle in the luff of a mainsail above the tack. The idea is to flatten the main sail in heavier weather or when sailing to windward.
The topping lift (more rarely known as an uphaul) is a line which applies upward force on a boom on a sailboat. Part of the running rigging, topping lifts are primarily used to hold a boom up when the sail is lowered. [1] This line would run from near the free end of the boom(s) forward to the top of the mast.