Bolt rope
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A bolt rope, is the rope that is sewn at the edges of the sail to reinforce them, or to fix the sail into a groove in the boom or in the mast.
Sail detail at the tack (lower corner of the leading edge) of a mainsail, showing bolt ropes in the luff and foot. Bolt ropes may extend to other parts of a sail, as well.
Mainsail
Videos
A mainsail is a sail rigged on the main mast of a sailing vessel.
A square-rigged vessel