• Source: Combined diesel or gas

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.




System



For every propeller shaft there is one diesel engine for cruising speed and one geared gas turbine for high speed dashes. Both are connected to the shaft with clutches; only one system is driving the ship, in contrast to combined diesel and gas (CODAG) systems that can use the combined power output of both. The advantage of CODOG is a simpler gearing compared to CODAG, but it needs either more powerful or additional gas turbines to achieve the same maximum power output. The disadvantage of CODOG is that the fuel consumption at high speed is poor compared to CODAG.




CODOG vessels


MGB 2009, a modified Motor Gun Boat of the Royal Navy (1947), and
The two German torpedo boats Pfeil and Strahl (Vosper class, 1963-65)
The US Navy Asheville-class gunboats (built 1966-1971)
The US Coast Guard Hamilton-class cutters (from 1967)
Halifax-class frigates of the Royal Canadian Navy
Bremen-class frigates, and
Brandenburg-class frigates of the German Navy
Gregorio del Pilar-class frigates of the Philippine Navy
Anzac-class frigates of the Royal Australian Navy (RAN) and Royal New Zealand Navy (RNZN)
other MEKO type frigates or corvettes
Peder Skram-class frigates of the Royal Danish Navy
Pohang-class corvettes of the South Korean Navy
Visby-class corvettes of the Swedish Navy
Shivalik-class frigates of the Indian Navy
Niterói-class frigates of the Brazilian Navy
BNS Bangabandhu of the Bangladesh Navy
Gepard-class frigates of the Russian and Vietnamese Navies
118 WallyPower, luxury yacht
Type 052D destroyers of the Chinese Navy




Citations






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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