What is a Stern Drive Engine?
The last type of engine is the stern drive, which is sometimes called an "inboard-outboard" because it shares features of both types of engines. Similar to inboards, stern drive engines use a four-stroke automotive engine mounted on the inside of the hull to power the boat.
Like an outboard, there is a drive unit used to steer the boat. To steer a stern drive, turn the steering wheel, which then turns the drive unit, and determines the direction of the boat.