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Inboard devices definition and examples

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Inboard Engines

An inboard is a four-stroke automotive engine adapted for marine use. Inboard engines are mounted inside the hull's midsection or in front of the transom.

The engine turns a drive shaft that runs through the bottom of the hull and is attached to a propeller at the other end.

Many personal watercraft (PWCs) have two-stroke inboard engines that burn oil as a lubricant along with the fuel. New-technology two-stroke PWC engines are direct-injection engines and burn cleaner than conventional PWC engines.

Steering of most inboard vessels, except PWCs and jet-drive boats, is controlled by a rudder behind the propeller.