Many varieties of sailboats also sport inboard motors to help propel the craft when the winds are low. There are multiple kinds of sailboats, including clippers, catamarans, schooners, and yawls.
These motors typically require diesel fuel rather than gasoline, for a variety of reasons. In the interest of safety, diesel engines have the advantage of using compression rather than an electrical spark, and they also produce no carbon monoxide. These motors also require less maintenance and lower repair costs.