Combined gas and gas

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.

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 speed is more efficient compared to a twice as powerful turbine running at half speed, 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

• Kolkata-class guided-missile destroyer (Indian Navy)
• Type 22 Frigate (Batch 3) (Royal Navy)
• Invincible-class aircraft carrier (Royal Navy)
• Hyūga-class helicopter destroyer (Japan Maritime Self-Defense Force)
• Izumo-class helicopter destroyer (Japan Maritime Self-Defense Force)
• Neustrashimyy-class frigate (Russian Navy)
• Sejong the Great-class destroyer (Republic of Korea Navy)