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. Marine usage of COGAG systems are similar to those found ashore.^[1]

Template:Combined-marine-propulsion A COGAG system consists of two gas turbines, each connected to a reduction gearbox. These are each attached to a coupling with both connected to larger gearbox and then to the ship's propeller.^[2]

Advantages of the system include a large degree of automation along with quick startup time, they are easier to silence and protect from shock.^[3] 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.^[4] Issues with COGAG systems include their complexity and gearbox issues and high fuel use.^[5]

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• Graves, G. L.; Carleton, R. S. (September 1963). "Gas Turbines for Unconventional Craft". Bureau of Ships Journal 12 (9): 7–12. 
• Plaff, Manfred (2021). Ship Operation Technology: Reference Book and Guidebook. Wiesbaden, Germany: Springer Fachmedien. ISBN 978-3-658-32729-3. 
• Soares, Claire (2015). Gas Turbines: A Handbook of Air, Land and Sea Applications (Second ed.). Kidlington, Oxford: Elsevier. ISBN 978-0-12-410461-7. 

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