Combined diesel or gas
Encyclopedia
Combined diesel or gas (CODOG) is a type of propulsion
Marine propulsion
Marine propulsion is the mechanism or system used to generate thrust to move a ship or boat across water. While paddles and sails are still used on some smaller boats, most modern ships are propelled by mechanical systems consisting a motor or engine turning a propeller, or less frequently, in jet...

 system for ship
Ship
Since the end of the age of sail a ship has been any large buoyant marine vessel. Ships are generally distinguished from boats based on size and cargo or passenger capacity. Ships are used on lakes, seas, and rivers for a variety of activities, such as the transport of people or goods, fishing,...

s that need a maximum speed that is considerably faster than their cruise speed, particularly warship
Warship
A warship is a ship that is built and primarily intended for combat. Warships are usually built in a completely different way from merchant ships. As well as being armed, warships are designed to withstand damage and are usually faster and more maneuvrable than merchant ships...

s like modern frigate
Frigate
A frigate is any of several types of warship, the term having been used for ships of various sizes and roles over the last few centuries.In the 17th century, the term was used for any warship built for speed and maneuverability, the description often used being "frigate-built"...

s or corvette
Corvette
A corvette is a small, maneuverable, lightly armed warship, originally smaller than a frigate and larger than a coastal patrol craft or fast attack craft , although many recent designs resemble frigates in size and role...

s.

For every propeller shaft there is one diesel engine
Diesel engine
A diesel engine is an internal combustion engine that uses the heat of compression to initiate ignition to burn the fuel, which is injected into the combustion chamber...

 for cruising speed and one geared
Transmission (mechanics)
A machine consists of a power source and a power transmission system, which provides controlled application of the power. Merriam-Webster defines transmission as: an assembly of parts including the speed-changing gears and the propeller shaft by which the power is transmitted from an engine to a...

 gas turbine
Gas turbine
A gas turbine, also called a combustion turbine, is a type of internal combustion engine. It has an upstream rotating compressor coupled to a downstream turbine, and a combustion chamber in-between....

 for high speed dashes. Both are connected to the shaft with clutch
Clutch
A clutch is a mechanical device which provides for the transmission of power from one component to another...

es, only one system is driving the ship in contrast to CODAG
Combined diesel and gas
Combined diesel and gas ' is a type of propulsion system for ships which need a maximum speed that is considerably faster than their cruise speed, particularly warships like modern frigates or corvettes....

-systems, which can use the combined power output of both. The advantage of CODOG is a simpler gearing compared to CODAG but it needs more powerful (or more) gas turbines for the same maximum power output and also the fuel consumption at high speed is even worse compared to CODAG.

CODOG vessels

  • MGB 2009, a prototype Motor Gun Boat of the Royal Navy
    Royal Navy
    The Royal Navy is the naval warfare service branch of the British Armed Forces. Founded in the 16th century, it is the oldest service branch and is known as the Senior Service...

     (1947), and
  • The Tribal class frigate
    Tribal class frigate
    The Type 81, or Tribal class, was a class of seven general-purpose frigates for the Royal Navy designed during the 1950s that served throughout the 1960s and 1970s with limited service during the 1980s.-History:...

    s (COSAG gas turbine propulsion. First ship commissioned in 1961
  • The two German torpedo boats Pfeil and Strahl (Vosper class, 1963-65)
  • The Swedish Spica class motor torpedo boats (First vessel commissioned in 1966)
  • The US Coast Guard Hamilton class cutter
    Hamilton class cutter
    The Hamilton class cutter was the largest class of vessel in the United States Coast Guard until replaced by the National Security Cutter, aside from the Polar Ice Breakers. The hull classification symbol is prefixed WHEC...

    s (from 1967)
  • Finnjet (the World's fastest passenger ferry)
  • Queen Mary 2
  • Halifax Class Frigates of the Royal Canadian Navy
    Royal Canadian Navy
    The history of the Royal Canadian Navy goes back to 1910, when the naval force was created as the Naval Service of Canada and renamed a year later by King George V. The Royal Canadian Navy is one of the three environmental commands of the Canadian Forces...

  • Bremen class frigate
    Bremen class frigate
    The eight F122 Bremen class frigates of the German Navy were commissioned between 1982 and 1990. The design is similar to the Dutch Kortenaer class but uses a different hull and propulsion system. The ships were built for anti-submarine warfare as a primary task even though they are not fitted with...

    s, and
  • Brandenburg class frigate
    Brandenburg class frigate
    The F123 Brandenburg class is a class of German frigate. They were ordered by the German Navy in June 1989, and then completed and commissioned between 1994 and 1996 to replace the Hamburg class destroyers...

    s of the German Navy
    German Navy
    The German Navy is the navy of Germany and is part of the unified Bundeswehr .The German Navy traces its roots back to the Imperial Fleet of the revolutionary era of 1848 – 52 and more directly to the Prussian Navy, which later evolved into the Northern German Federal Navy...

  • Anzac class frigate
    Anzac class frigate
    The Anzac class is a ship class of ten frigates; eight operated by the Royal Australian Navy and two operated by the Royal New Zealand Navy...

    s of the Royal Australian Navy
    Royal Australian Navy
    The Royal Australian Navy is the naval branch of the Australian Defence Force. Following the Federation of Australia in 1901, the ships and resources of the separate colonial navies were integrated into a national force: the Commonwealth Naval Forces...

     (RAN) and Royal New Zealand Navy
    Royal New Zealand Navy
    The Royal New Zealand Navy is the maritime arm of the New Zealand Defence Force...

     (RNZN)
  • other MEKO
    MEKO
    The MEKO family of warships was developed by the German company Blohm + Voss.MEKO is a registered trademark. The portmanteau stands for "Mehrzweck-Kombination" . It is a concept in modern naval shipbuilding based on modularity of armament, electronics and other equipment, aiming at ease of...

     type frigates or corvettes
  • Peder Skram class frigate
    Peder Skram class frigate
    The Peder Skram class frigate was a class of frigate built for the Royal Danish Navy in the period 1964 - 1967. Only two vessels in this class were ever constructed, Peder Skram F352 and . The ships were named after Danish Admirals Peder Skram and Herluf TrolleThe ships were modernised in 1976-78...

     of the Royal Danish Navy
    Royal Danish Navy
    The Royal Danish Navy is the sea-based branch of the Danish Defence force. The RDN is mainly responsible for maritime defence and maintaining the sovereignty of Danish, Greenlandic and Faroese territorial waters...

  • Pohang class corvette
    Pohang class corvette
    The Pohang class corvette is a class of general purpose vessels operated by the Republic of Korea Navy. They have served in a coastal defense role during the late Cold War and post Cold War period....

     of the South Korean Navy
  • Visby class corvette
    Visby class corvette
    The Visby is the latest class of corvette to be adopted by the Royal Swedish Navy after the Göteborg and the Stockholm class corvettes. The ship's design heavily emphasizes "low visibility" or stealth technology. The first ship in the class is named after Visby, the main city on the island of Gotland...

     of the Swedish Navy
    Swedish Navy
    The Royal Swedish Navy is the naval branch of the Swedish Armed Forces. It is composed of surface and submarine naval units – the Fleet – as well as marine units, the so-called Amphibious Corps .In Swedish, vessels of the Swedish Navy are given the prefix "HMS," short for Hans/Hennes...

  • Shivalik class frigate
    Shivalik class frigate
    The Shivalik class frigates or Project 17 class frigates are multi-role frigates with stealth features being built for the Indian Navy. They are the first warships being built in India with such features. The lead vessel of the class was commissioned on April 29, 2010.The Shivalik class will be the...

     of the Indian Navy
    Indian Navy
    The Indian Navy is the naval branch of the armed forces of India. The President of India serves as the Commander-in-Chief of the Navy. The Chief of Naval Staff , usually a four-star officer in the rank of Admiral, commands the Navy...

  • Niterói class frigates of the Brazilian Navy
  • BNS Bangabandhu of the Bangladesh Navy
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