Marine Surveyors Lexicon

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I/O (Inboard/outboard)


A propulsion system that uses an inboard motor, mounted at the transom, with a propeller assembly, similar to the bottom of an outboard, mounted on the outside of the transom, bolting to the motor with the transom sandwiched between. Also called a stern drive. In most designs it can be used optionally to a v-drive, or jet drive.