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It is a four-stroke, vertical, water-cooled diesel engine. It is built around two cylinders (hence the "2" in 2GM20) of 75 mm in diameter and 72 mm in stroke, adding up to 0.635 litres in displacement: each cylinder is roughly the size and volume of a 300 ml soft-drink can.
An inboard motor is a marine propulsion system for boats. As opposed to an outboard motor, where an engine is mounted outside the hull of the craft, an inboard motor is an engine enclosed within the hull of the boat, usually connected to a propulsion screw by a driveshaft. Marine diesel engines used in international shipping are the largest ...
ABB provided an azimuth thruster for ShinNihonkai Ferries in form of the CRP Azipod, [2] claiming efficiency gains from the propeller (about 10% increase [3]) and a simpler hull design. Volvo Penta have launched the IPS (Inboard Performance System), [4] an integrated diesel, transmission and pulling contra-rotating propellers for motor yachts.
Depending on the size of the motors driving these propellers, they could draw an insignificant amount of power or a large amount of power that requires much caution to operate. Another smaller subset of positioning thrusters is those used for maneuvering unmanned aquatic vehicles like Guanay II AUV tested by scientists from Spain (Masmitja, 2018).
Typically in smaller (less than 10 hp or 7.5 kW) and older engines, a narrow shear pin through the drive shaft and propeller hub transmits the power of the engine at normal loads. The pin is designed to shear when the propeller is put under a load that could damage the engine.
Sterndrive engines are similar to those used in true inboard systems. Historically the most popular in North America were " marinised " versions of Chevrolet and Ford V-8 automotive engines. In Europe diesel engines are more popular, ranging up to 400 hp in models such as the Volvo Penta D6A-400.