Outboard

[Sarah]

Beyond or outside of the lines of a vessel's bulwarks or hull;in a direction from the hull or from the keel; -- opposed to inboard;as, outboard rigging; swing the davits outboard.

[Sarah]

a motor with a propeller, designed to be attached to the back of a small boat

[Marquetta]

Situated on, towards, or near the outside of a ship or aircraft.