What Is the ‘Draft’ of a Sail and How Does It Affect Performance?
The draft of a sail is the amount and shape of curvature in its horizontal cross-section, often called ‘belly.’ A sail with draft works as an airfoil, producing lift that drives the boat. Draft depth and draft position directly affect power, pointing ability, steering ease, and heeling. Understanding and adjusting draft is a core seamanship skill for safer, faster, and more comfortable sailing.
