Combined gas and gas

Short description: Two-turbine, one-shaft marine propulsion

Principle of a COGAG propulsion system

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]

## Contents

* 1 Description
* 2 Advantages and disadvantages
* 3 List of COGAG ships
* 4 Citations
* 5 References

## Description

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 and disadvantages

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]

## List of COGAG ships

* Kolkata-class guided-missile destroyer (Indian Navy)
* INS Vikrant (aircraft carrier) (Indian Navy)
* Type 22 frigate (Batch 3) (Royal Navy)
* Invincible-class aircraft carrier (Royal Navy)
* Cavour-class aircraft carrier (Italian Navy)
* Asagiri-class destroyer (Japan Maritime Self-Defense Force), and subsequent destroyer classes
* Hyūga-class helicopter destroyer (Japan Maritime Self-Defense Force), helicopter carrier
* Izumo-class helicopter destroyer (Japan Maritime Self-Defense Force), helicopter carrier
* Type 055 destroyer (People's Liberation Army Navy)
* Neustrashimy-class frigate (Russian Navy)
* Sejong the Great-class destroyer (Republic of Korea Navy)
* Skjold-class corvette (Royal Norwegian Navy)
* Arleigh Burke-class destroyer (United States Navy)
* Ticonderoga-class cruiser (United States Navy)

## Citations

1. ↑ Soares 2015, pp. 10, 27.
2. ↑ Plaff 2021, p. 95.
3. ↑ Graves & Carleton 1963, p. 12.
4. ↑ Soares 2015, p. 31.
5. ↑ Plaff 2021, p. 92.

## References

* 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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