Jet ski is the brand name of Kawasaki Heavy Industriespersonal water craft. The name, however, is often used as a generic term for other makes of personal watercraft. Typically these craft are propelled by rapidly expelling water behind them in a jet, rather than turning a screw in propeller driven ships.
Because of their relatively low cost they are widely used on water bodies across the world. Whilst many are used responsibly and with regard to the natural environment, a minority are used recklessley and with little regard to the noise and environmental impact that they can cause. As a result there are pressures in many parts of the world for regulation in the use and management of such craft.
Jetskis are personal watercrafts (PWC) developed commercially since the early 1970's, typically using an indoor motor to rotate a jet pump which in turn, rapidly and powerfully, force water behind the vessel, creating the power to drive forward, rather than driven by a conventional screw-shaped propeller.
Jetski was kind of a "nickname" that Kawasaki gave to their personal watercrafts in the early beginning and it became a household name for it a long while.
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After a brief period, the trailing jetski with the young couple aboard turned around and buzzed past the stern of Tim's kayak at a very short distance, with obvious intent, then passed ahead of me at a distance of less than ten feet.
The jetski rushed on ahead, taking a close pass past Macomber and spraying him with his jetwash, then buzzed the red kayak, which we later learned was paddled by Joel Bredemeyer of Ft. Wayne, IN, whom we had not previously met.
We even had a guy on a jetski stop and ask how we were doing -- it turned out to be the guy that had provided coffee, towels and a cell phone when we stopped at his house to recover.