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combined gas or gas
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 s, in the Royal Navy Type 42 destroyers, the Royal Canadian Navy s, and the Dutch Navy s (on which the Greek Navy s are based).
of the Royal Navy was converted to COGOG propulsion as a test bed for its use in later British ships.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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