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Jet-Ski is the brand name of personal watercraft (PWC) affected by Kawasaki Heavy Industries, Ltd... The name, however, has become a widespread trademark for any type of personal watercraft. Jet Ski (or Jet Ski) can also specially refer to versions of PWCs with pivoting handle poles known as "stand-ups".
Jet Ski becomes leading colloquial term for stand-ups because, in 1973, Kawasaki was in charge for a limited production of stand-up models as intended by the recognized inventor of jet skis, Clayton Jacobsen II. In 1976, Kawasaki then began mass manufacture of the JS400-A. JS400s came with 400 cc two-stroke engines and hulls based upon the previous incomplete release models. It became the harbinger of the achievement Jet-Skis would see in the market up through the 1990s.
In 1986 Kawasaki broadened the world of Jet Skis by introduce a two person representation with lean-in "sport" style handling and a 650cc engine, dubbed the X-2. Then in 1989, they innovate their first two traveler "sit-down" model, the Tandem Sport (TS) with a step-through seating area.
In 2003, Kawasaki famous the Jet Ski brand by release a special 30th anniversary edition of its current stand-up model, the SX-R, which has seen a renewal of interest in stand-up jet skiing. The X-2 has also been efficient, based on the SX-R platform and re-released in Japan. Kawasaki continues to produce three models of sit-downs, as well as many four-stroke models.

A hovercraft, or air-cushion vehicle (ACV), is a vehicle or craft that can be hold up by a cushion of air dispossessed downwards against a surface close below it, and can in principle travel over any relatively smooth surface, such as gently sloping land, water, or marshland, while having no substantial contact with it.
Hovercraft has one or more parts of engines (some craft, such as the SR-N6, have one engine with a drive split through a gearbox). One engine drives the fan (the impeller) which is in charge for exciting the vehicle by forcing air under the craft. The air therefore must exit throughout the "skirt", lifting the craft above the area which the craft resides. One or more additional engines are used to offer thrust in order to propel the craft in the favorite direction. Some hovercraft utilized ducting to allow one engine to perform both tasks by directing some of the air to the skirt, the rest of the air passing out of the back to push the craft forward.

A fireboat is a paying attention watercraft, often similar to a tugboat, with pumps and nozzles planned for fighting shoreline and shipboard fires. They are mostly useful for fighting fires on docks and shore side warehouses as they can directly attack fires in the supporting underpinnings of these structures. They also have an countless supply of water available, pumping straight from the harbor and can be used to assist shore based firefighters when other water is in low supply or is unavailable, for example, due to earthquake breakage of water mains, as happened in San Francisco due to the 1989 Loma Pieta earthquake.
Modern fireboats are competent of pumping tens of thousands of gallons of water per minute. The most technically advanced of these is Fire Boat #2 of the Los Angeles Fire Department, the Warner Lawrence, with the capability to pump up to 38,000 US gallons per minute (2 m³/s) and up to 400 feet (120 m) in the air.
Fireboats are most frequently seen by the public when welcoming a fleet or historical ships with a display of their water moving capabilities, throwing large arcs of water in every direction.