Batten

A thin, flat strip of wood, plastic, or fibreglass inserted into a sail to help maintain its shape and improve performance

A batten is an essential component in the design of many sails, particularly in modern sailing vessels. Traditionally, sails were made from natural fibres, and their shape was maintained primarily by the tension applied through rigging. However, as sail technology evolved, battens were introduced to help maintain the desired aerodynamic shape of the sail, especially in high-performance or larger sails. Battens are typically inserted into pockets sewn into the sail, running perpendicular to the leech (the trailing edge of the sail). These battens stiffen the sail, preventing it from flapping or distorting in the wind, which can lead to inefficiency and wear.

In addition to improving the sail’s shape, battens also allow for more aggressive sail designs, such as full-batten mainsails, where the battens run the entire width of the sail. This design helps distribute the forces acting on the sail more evenly, reducing stress points and allowing for a more powerful sail plan. Battens are usually made from lightweight, durable materials like fibreglass or carbon fibre, which provide the necessary stiffness without adding excessive weight. Properly maintained and positioned battens can significantly enhance a vessel’s sailing performance, particularly when sailing upwind or in challenging conditions.