propulsion system: COGOG Naval Engine

Combined gas or gas (COGOG) is a type propulsion system using only 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.

Used by

1972	Iroquois class destroyer DD	1
1974	Type 21 Amazon class frigate FF	1
1975	Tromp class guided-missile frigate FFG	1
1975	Type 42 (Batch 1 and 2) class guided-missile destroyer DDG	2
1975	Spruance class destroyer DD	2
1978	Kortenaer class frigate FF	1
1979	Type 22 (Batch 1) Broadsword class frigate FF	2
1981	Kidd class guided-missile destroyer DDG	2
1982	Project 1164 Atlant class guided-missile cruiser CG	2
1982	Hatsuyuki class destroyer DD	2
1983	Type 22 (Batch 2) Boxer class frigate FF	2
1983	Ticonderoga class guided-missile cruiser CG	2

In Service

Canadian Armed Forces

Royal Navy

Pakistan Navy

US Navy

Royal Netherlands Navy

Japanese Navy

Russian Navy

Chilean Navy