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Siemens Schottel azimuth thrusters USCGC Healy uses a diesel–electric propulsion system designed by GEC-Alsthom. The first diesel motorship was also the first diesel–electric ship, the Russian tanker Vandal from Branobel, which was launched in 1903.
The CODLAD propulsion system is based on the use of electric motors directly connected to the axes (generally two) of the propellers. The electric motors are powered by diesel generators and to have higher speeds, as happens in CODAD propulsion systems, the higher power diesel engine is inserted which is disconnected from the transmission system to return to cruising speed.
Combined diesel–electric and gas (CODLAG) is a modification of the combined diesel and gas propulsion system for ships. A variant, called the combined diesel–electric or gas ( CODLOG ) system, contains the same basic elements but will not allow simultaneous use of the alternative drive sources.
An example of integrated electric propulsion in the Type 45 destroyer (GT: gas turbine; DG: diesel generator) Integrated electric propulsion (IEP), full electric propulsion (FEP) or integrated full electric propulsion (IFEP) is an arrangement of marine propulsion systems such that gas turbines or diesel generators or both generate three-phase [1] electricity which is then used to power ...
Integrated electric propulsion – Arrangement of marine propulsion systems that generators generate electricity; Internal drive propulsion – Form of marine propulsion. Non-road engine – Internal combustion engine classification; Nuclear marine propulsion – Propulsion system for marine vessels utilizing a nuclear powerplant
Air-independent propulsion (AIP), or air-independent power, is any marine propulsion technology that allows a non-nuclear submarine to operate without access to atmospheric oxygen (by surfacing or using a snorkel). AIP can augment or replace the diesel-electric propulsion system of non-nuclear vessels.
Another way to combine the two types of engines is to connect them to generators and drive the propellers electrically as in a diesel-electric. See Combined diesel–electric and gas (CODLAG) and Integrated Electric Propulsion (IEP). This also permits propeller pods, with the propulsion motors being located inside the pods.
A gearbox and clutches enable either of the engines or both of them together to drive the shaft. Two advantages over simply using a single, larger diesel engine of the same total power output are that (1) diesel engines have somewhat better specific fuel consumption at 75% to 85% max output than they do at only 50% output, and (2) there is a weight and size advantage to using two higher-speed ...