CODOG
CODAG
CODLAG
CODAD
COSAG
COGOG
COGAG
COGAS
CONAS
Combined gas or gas (COGOG) is a propulsion system for ships using gas turbine engines. A high efficiency, low output turbine is used for cruising speeds with a high output turbine being used for high-speed operations. A clutch allows either turbine to be selected, but there is no gearbox to allow operation of both turbines at once. This has the advantage of not requiring heavy, expensive and potentially unreliable gearboxes.
The reason that a smaller turbine is used for cruising is that a small turbine running at 100% power is more fuel efficient than a bigger turbine running at 50% power.
The system is currently used in the 3 ships of the Russian Navy's Slava class cruisers, and in the Royal Navy Type 42 destroyers.
HMS Exmouth (F84) of the Royal Navy was converted to COGOG propulsion as a test bed for its use in later British ships.
Famous quotes containing the words combined and/or gas:
“... overconfidence in one’s own ability is the root of much evil. Vanity, egoism, is the deadliest of all characteristics. This vanity, combined with extreme ignorance of conditions the knowledge of which is the very A B C of business and of life, produces more shipwrecks and heartaches than any other part of our mental make-up.”
—Alice Foote MacDougall (1867–1945)
“Papa died in the gas chamber,
slipping blue as an undressed minnow,
gulping in the shower to wash the Jew off him.”
—Anne Sexton (1928–1974)