A Motorsailer, aka "motorsailor" (US), is a type of sailing vessel, typically a pleasure yacht, that derives propulsion from its sails and engine(s) in equal measure. Whereas most sailing yachts above a certain size (say, 7 meters LOA) will usually have an inboard engine, they will not be "motorsailers", as their principal source of power is sail, and the engine is primarily for maneuvering and motoring in light airs. A sailing yacht with an auxiliary engine will typically have a small propeller that automatically feathers when sailing, whereas a motorsailer may have either a large fixed propeller or, ideally, a variable-pitch propeller. Compared to such "pure" sailing yachts, a motorsailer will typically be heavier-built, perhaps with less delicate lines but with more spacious accommodati