Bonnet (sail)
A bonnet is a sheet of cloth that is used to enlarge the sail area of a square sail . This strip of cloth is tied to the foot of the square sail and removed again if necessary in strong winds .
With individual vehicle types, the bonnet serves as a particularly large foresail, which is similar to the genoa sail and, like the jib sail, can be laid across the ship's axis.
function
The bonnet sail is especially used in regattas . With it it is possible to reach the maximum speed on the wind.