The
genoa or
genny was originally referred to as an 'overlapping jib' and later as a
Genoa jib. It is a type of large
jib or
staysail that overlaps the main sail, sometimes eliminating it. It is used on single-masted
sloops and twin-masted boats such as
yawls and
ketches. Its larger surface area increases the speed of the craft in light to moderate winds; in high wind conditions a smaller jib is usually substituted, and downwind a
spinnaker may be used. The feature that distinguishes a genoa from a working jib is that the former extends past the mast, overlapping the mainsail when viewed from the side.