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Principle of a COSAG 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.

Combined
marine
propulsion

CODOG
CODAG
CODLAD
CODLAG
CODAD
COSAG
COGOG
COGAG
COGAS
CONAS
IEP or IFEP

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. ^ Friedman, p. 206

Bibliography

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