In Hauler

A line or tackle used to pull a sail or spar inboard, typically to adjust sail shape or reduce projection beyond the hull.

An in hauler is a control line or system used aboard sailing vessels to draw a sail, usually a headsail such as a jib or genoa, closer to the centreline of the boat. This adjustment is primarily used to fine-tune the sail’s shape and angle to the wind, enhancing performance, particularly when sailing upwind. By hauling the clew of the sail inboard, the in hauler reduces the slot between the headsail and the mainsail, increasing airflow efficiency and improving lift. It is commonly used in conjunction with an barbour hauler or standard sheet to achieve precise sail trim. In haulers are often employed in racing yachts where small adjustments can yield significant gains in speed and pointing ability. The line is typically led from the sail’s clew to a block and then to a winch or cleat within reach of the crew for easy adjustment while underway. Proper use of the in hauler requires an understanding of sail dynamics, as overuse can stall airflow or create excessive heel.