outhaul

An outhaul is a line, rope, or mechanical system used to tension the foot of a sail along the boom. By pulling the sail’s clew toward the end of the boom, the outhaul shapes the sail, typically flattening the lower portion of the sail in stronger winds and increasing draft in lighter winds.

Construction and configurations vary. In a basic setup, the outhaul runs from a fitting at the end of the boom to a point on the sail’s foot, often passing through blocks along the boom and ending at a cleat or winch in the cockpit. More complex arrangements use a tackle (two-to-one, four-to-one, or higher) to multiply effort and allow convenient trimming from the helm. Outhauls may be controlled from the mainsheet area or, on larger boats, from a dedicated winch station.

Usage and trim. Tightening the outhaul flattens the mainsail, reducing drag and improving upwind performance in windy conditions. Loosening the outhaul increases fullness and power in light to moderate breeze. The optimal setting depends on wind speed, sail plan, course, and boat speed; modern systems permit adjustment from the cockpit.

Maintenance and care. Regularly inspect the outhaul line for wear, chafe, and UV damage. Check blocks, fittings, and batten pockets for proper alignment. Replace worn lines and use appropriate protective sheaths to prevent snagging on spar hardware.

See also: halyard, mainsail, boom, clew, sail trim.