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・ Combined driving
・ Combined drug intoxication
・ Combined Egyptian Mills
・ Combined English Universities (UK Parliament constituency)
・ Combined English Universities by-election, 1926
・ Combined English Universities by-election, 1937
・ Combined English Universities by-election, 1946
・ Combined events at the Olympics
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Combined gas and gas
・ Combined gas and steam
・ Combined gas law
・ Combined gas or gas
・ Combined Heat and Power Association
・ Combined Heat and Power Quality Assurance
・ Combined hyperlipidemia
・ Combined immunodeficiencies
・ Combined Independent Colleges
・ Combined Information Data Network Exchange
・ Combined injectable contraceptive
・ Combined Insurance
・ Combined internal medicine and psychiatry residency
・ Combined intracavernous injection and stimulation test
・ Combined Islands cricket team


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Combined gas and gas : ウィキペディア英語版
Combined gas and gas

Combined gas turbine and gas turbine (COGAG) is a type of propulsion system for ships using two gas turbines connected to a single propeller shaft. A gearbox and clutches allow either of the turbines to drive the shaft or both of them combined.
Using one or two gas turbines has the advantage of having two different power settings. Since the fuel efficiency of a gas turbine is best near its maximum power level, a small gas turbine running at its full power is more efficient compared to a twice as powerful turbine running at half power, allowing more-economical transit at cruise speeds.
Compared to Combined diesel and gas (CODAG) or Combined diesel or gas (CODOG), COGAG systems have a smaller footprint but a much lower fuel efficiency at cruise speed and for CODAG systems it is also somewhat lower for high speed dashes.
== List of COGAG ships ==

* guided-missile destroyer (Indian Navy)
*Type 22 frigate (Batch 3) (Royal Navy)
* (Royal Navy)
* (Italian Navy)
* (Japan Maritime Self-Defense Force)
* (Japan Maritime Self-Defense Force)
* (Russian Navy)
* (Republic of Korea Navy)

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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