Hydrospace

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The Hydrospace is the world's first stand-up four-stroke jet ski, or personal watercraft. It was introduced in October 2005 by Hydrospace Inc.

The company originated in Pöchlarn, Austria, with US offices in Pompano Beach, Florida. The Hydrospace is a single-passenger stand-up watercraft which was designed primarily for racing. The only model offered is the "Hydrospace S4". The retail price of an S4 is around $15,000 USD.

The S4 is powered by a two-cylinder water-cooled engine with a displacement of 749cc, which is rated at 110 hp. The engine is equipped with a turbocharger from the factory. The S4 has a dry weight of 370 lbs. making it the second heaviest stand-up ever made, second only to Sea-doo's 3D which had a dry weight of 580 lbs.

Although touted as being the most advanced stand-up ever manufactured, the S4 has been plagued with problems. The S4 has had numerous recalls on various pieces of faulty equipment. The hulls are also known to be of very lightweight construction and will break under strenuous operating conditions.

The control handles are constructed of carbon fiber, which is very brittle and known to break during operation – a serious safety concern. The throttle cable is also known to jam in the wide-open position, causing further safety concerns.