sleevesail

A sleevesail is a type of sail used on some sailing vessels, particularly smaller boats like dinghies and some catamarans. It is characterized by its shape, which resembles a sleeve or a bag. Unlike conventional sails that are typically flat or slightly curved, a sleevesail is designed to be more voluminous and curved, often described as having a bat-wing shape.

The primary advantage of a sleevesail is its ability to generate power and efficiency, especially in lighter wind conditions. Its curved, three-dimensional shape allows it to scoop and capture more wind, providing greater drive for the boat. This can result in improved performance and the ability to sail effectively in a wider range of wind speeds. The sleevesail can also be simpler to handle and trim for some sailors, as its inherent shape can make it less prone to luffing or flapping. However, sleevesails can sometimes be more complex to manufacture and may require specific rigging arrangements compared to standard sails. Their use is often found in racing classes where optimized sail shapes are crucial for performance gains.