Saildrive

A saildrive is a transmission system for a boat whose inboard engine has a horizontal output shaft.

Traditional sailboat transmissions consist of a simple horizontal output shaft extended rearward from the engine, through the stern via a stuffing box.

[1] Among the earliest representatives of the technology was the OMC Zephyr Saildrive, produced from 1977 to 1984.

This was a two-stroke gasoline engine to which oil needed to be added on a 50:1 mixture.

It was a derated version of the 32 cubic inch engine block used at that time on the OMC Evinrude 25/30/35 hp outboards.