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Combined steam and gas (COSAG) is apropulsion system forships using a combination ofsteam turbines andgas turbines to power theshafts.
| Combined marine propulsion |
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Combined diesel or gas (CODOG) |
Agearbox andclutches enable either of the engines or both of them together to drive the shaft.[1] It has the advantage of the cruising efficiency and reliability of steam and the rapid acceleration and start-up time of gas. This system was mainly used on first-generation gas-turbine ships such as theRoyal Navy'sCounty-class destroyer andTribal-class frigate.