Twin Inboard

An Inboard motor is a marine propulsion system. As opposed to an Outboard motor where an engine is mounted outside of the hull of the craft, an Inboard motor is enclosed within the hull of the boat usually connected to a propulsion screw by a driveshaft. Twin Inboard Drives are two independent, side-by-side engines within a single boat and are very effective in close quarters. This effective twin drive setup uses two inboard engines, two propellers and two rudders.

Single Inboard

An Inboard motor is a marine propulsion system. As opposed to an Outboard motor where an engine is mounted outside of the hull of the craft, an Inboard motor is enclosed within the hull of the boat usually connected to a propulsion screw by a driveshaft. Single Inboard's are powered by one engine, diesel or gas, with one propeller and a rudder positioned amidship directly behind the prop.

Stern Drive / Outboard

The Stern Drive, also called an Inboard / Outboard (I / O) is a form of marine propulsion and is located inboard just forward of the transom or stern and delivers power via a shaft that goes through the transom to the drive unit located outside the hull and resembles the bottom half of an outboard. This unit contains the gearing for the system and carries the propeller. The boat is steered by pivoting this unit and no rudder is needed.

An Outboard motor consists of a self-contained unit that includes engine, gearbox and propeller designed to be affixed to the outside of the transom. As well as providing propulsion, outboards provide steering control as they are designed to pivot over their mountings to control the direction of thrust.