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Course Outline

Stern drive engine
  • Stern drives are known also as inboard/outboards (I/Os) because they combine features found on both inboard and outboard engines. Stern-drive engines:
    • Are four-stroke automotive engines adapted for marine use and...
    • Are mounted inside the boat and...
    • Are quieter and more fuel-efficient engines.
  • A stern-drive engine is attached through the transom to a drive unit (also called an “outdrive”) that is essentially the lower unit of an outboard. The engine turns a drive shaft that is attached to a propeller at the other end.
  • Steering of stern-drive boats is controlled by the outdrive, which swivels like an outboard engine to direct propeller thrust.
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