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Combined diesel and diesel

From Wikipedia, the free encyclopedia
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.

System

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Combined
marine
propulsion

CODOG
CODAG
CODLAD
CODLAG
CODAD
COSAG
COGOG
COGAG
COGAS
CONAS
IEP or IFEP

A gearbox and clutches enable either of the engines or both of them together to drive the shaft. Two advantages over simply using a single, larger diesel engine of the same total power output are that (1) diesel engines have somewhat better specific fuel consumption at 75% to 85% max output than they do at only 50% output, and (2) there is a weight and size advantage to using two higher-speed engines compared to a single lower-speed engine, even with the slightly larger gearbox system.

CODAD vessels

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Passenger and Car Ferry Ships

Containerships

Coast Guard Offshore General-Purpose Cutters

Coast Guard Offshore Security Patrol Cutters

Coast Guard Multi-mission Cutters

Coast Guard Interceptor Cutters

Coast Guard Security Cutters

Patrol Corvettes / Navy OPVs

Corvettes

Frigates

LSDs (landing ships, dock)

LPDs (landing platforms, dock)

Amphibious Flat-topped Ships

FACs (fast attack-craft)

Cruise Ships

References

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  1. ^ "Babcock wins £1.25bn Type 31 frigate contract". The Engineer. 12 September 2019. Retrieved 12 October 2019.