Combined diesel or gas
Compression-ignition engine plus turbine connected to one drive shaft / From Wikipedia, the free encyclopedia
Combined diesel or gas (CODOG) is a type of propulsion system for ships that need a maximum speed that is considerably faster than their cruise speed, particularly warships like modern frigates or corvettes.
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![](http://upload.wikimedia.org/wikipedia/commons/thumb/3/33/CODOG-diagram.png/320px-CODOG-diagram.png)