Watercraft by propulsion

thumb|A motorsailer|300x300px thumb|A ketch-rigged motorsailer thumb|A canoe-sterned motorsailer A motorsailer is a type of motor-powered sailing vessel, typically a yacht, that can derive power from its sails or engine, independently from each other during moderate seas or winds. A motorsailer may have a sail-to-engine power ratio in the range 30/70 to 70/30 (percent sail power/percent engine power).