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Combined diesel and diesel

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Two-compression-ignition-engine, one-drive shaft propulsion
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Principle of a CODAD propulsion system

Combined diesel and diesel (CODAD) is apropulsion system forships using twodiesel engines to power a singlepropeller shaft.

System

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Combined marine propulsion

Combined diesel or gas (CODOG)
Combined diesel and gas (CODAG)
Combined diesel-electric and diesel (CODLAD)
Combined diesel–electric and gas (CODLAG)
Combined diesel and diesel (CODAD)
Combined steam and gas (COSAG)
Combined gas or gas (COGOG)
Combined gas and gas (COGAG)
Combined gas and steam (COGAS)
Combined nuclear and steam propulsion (CONAS)
Integrated electric propulsion (IEP or IFEP)

Agearbox andclutches 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 betterspecific 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 twohigher-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. Retrieved12 October 2019.
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