Combined_steam_and_gas

Combined steam and gas

Combined steam and gas

Marine propulsion system

Combined steam and gas (COSAG) is a propulsion system for ships using a combination of steam turbines and gas turbines to power the shafts.

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Principle of a COSAG propulsion system

System

A gearbox and clutches 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 the Royal Navy's County-class destroyer and Tribal-class frigate.

The Spanish aircraft carrier Dédalo also used it.

Citations

  1. [1]
    Friedman, p. 206

Bibliography

  • Friedman, Norman (1993). "Propulsion". In Gardiner, Robert & Friedman, Norman (eds.). Navies in the Nuclear Age. London: Conway Maritime Press. pp. 199–210. ISBN 1-55750-613-2.
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