Large outboards affixed to the transom using clamps and are either tiller steer up to approx 100hp. Generally 100hp plus is linked to controls at the helm. These range from 2-, 3-, and 4-cylinder models generating 15 to 135 horsepower suitable for hulls up to 17 feet (5.2 m) in length to powerful V6 and V8 cylinder blocks rated up to 627 hp (468 kW).,[2] with sufficient power to be used on boats of 37 feet (11 m) or longer.