A personal water craft (PWC), also called water scooter, is a recreational watercraft that the rider rides or stands on, rather than inside of, as in a boat. These have an inboard engine driving a pump jet that has a screw-shaped impeller to create thrust for propulsion and steering. They are often referred by the trademarked brand names Jet Ski, WaveRunner, or Sea-Doo. There are a wide variety of "jet boats" many of which exceed 30-40' in length. The Coast Guard defines a personal watercraft, amongst other criteria, as a jet drive boat less than 13' in length, in order to exclude from that definition, more conventional sized jet boats. Most are designed for two or three people, though four-passenger models exist. The invention of both major types of personal water craft, the stand-up and sit-down models, is credited to Clayton Jacobson II of Lake Havasu City, Arizona, USA, originally a motocross enthusiast.
Contributions by Rickbrent, Will Beback, and User2004.