CODOG CODAG CODLAG CODAD COSAG COGOG COGAG COGAS CONAS Combined diesel or gas (CODOG) is a type of propulsion system for ships that need a maximum speed that is considerable faster than their cruise speed, particularly warships like modern frigates or corvettes. ... Combined diesel and gas, usually abbreviated CODAG is a type of propulsion system for ships, particularly warships. ... COmbined Diesel-eLectric And Gas (CODLAG) is a modification of the combined diesel and gas propulsion system for ships. ... Principle of a CODAD propulsion system Combined diesel and diesel (CODAD) is a propulsion system for ships using two diesel engines to power a single propeller shaft. ... Principle of a COSAG propulsion system Combined steam and gas (COSAG) is a propulsion system for ships using a combination of steam turbines and gas turbines to power the shafts. ... Principle of a COGOG propulsion system Combined gas or gas (COGOG) is a propulsion system for ships using gas turbine engines. ... A turbo-electric COGAS power-plant Combined gas and steam (COGAS) is the name given to marine compound powerplants of gas and steam turbines, the latter are fed with steam generated with the heat from the hot exhaust of the gas turbines. ... The Combined Nuclear And Steam propulsion system (CONAS) is used on the Admiral Nakhimov class (previously Kirov class) Guided missile cruisers. ...
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. Image File history File links COGAG-diagram. ... Image File history File links COGAG-diagram. ... This machine has a single-stage radial compressor and turbine, a recuperator, and foil bearings. ... A propeller shaft connects a propeller to an engine. ... In mechanics, a transmission or gearbox is the gear and/or hydraulic system that transmits mechanical power from a prime mover (which can be an engine or electric motor), to some form of useful output device. ... A clutch is a subcomponent of an engines transmission designed to allow engagement or disengagement of the engine to the gearbox or whatever apparatus is being driven. ...
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 economic transit at cruise speeds. Fuel efficiency relates the efficiency of conversion to kinetic energy from energy contained in a carrier fuel, specifically in a transportation vehicle, such as an automobile. ...
Compared to Combined diesel and gas (CODAG) or Combined diesel or gas COGAG systems have a smaller footprint but a much lower fuel efficiency at cruise speed and for CODAG systems its also somewhat lower for high speed dashes. Combined diesel and gas, usually abbreviated CODAG is a type of propulsion system for ships, particularly warships. ... Combined diesel or gas (CODOG) is a type of propulsion system for ships that need a maximum speed that is considerable faster than their cruise speed, particularly warships like modern frigates or corvettes. ...
The first large passenger vessel with COGAG system was, the car-ferry FINNJET of May 1977 which can link the 660 nautical miles between Finland and Germany in 22h30min at the average speed of 30.5 kts.
By the way, she's no longer a COGAG ship since the 1981's refit because, due to economical recession in Europe, two 15,500 HP Wartsila Diesel engines were added (areas on the main car deck were sacrificed) to reach 18-20 kts and do the same trip in 38 hours during off-peak saison.
This is in fact a sort of COGAG system which is improved and not a COSAG one.
HMS Coventry (D118) was a Type 42 destroyer of the Royal Navy laid down by Cammell Laird and Company, Limited, at Birkenhead on 29 January 1973, launched on 21 June 1974 and commissioned on 20 October 1978.
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