Combined diesel and diesel (CODAD) is a

propulsion Propulsion is the generation of force by any combination of pushing or pulling to modify the translational motion of an object, which is typically a rigid body (or an articulated rigid body) but may also concern a fluid. The term is derived from ...

system for

ship A ship is a large watercraft, vessel that travels the world's oceans and other Waterway, navigable waterways, carrying cargo or passengers, or in support of specialized missions, such as defense, research and fishing. Ships are generally disti ...

s using two

diesel engine The diesel engine, named after the German engineer Rudolf Diesel, is an internal combustion engine in which Combustion, ignition of diesel fuel is caused by the elevated temperature of the air in the cylinder due to Mechanics, mechanical Compr ...

s to power a single propeller shaft.

System

A gearbox and

clutch A clutch is a mechanical device that allows an output shaft to be disconnected from a rotating input shaft. The clutch's input shaft is typically attached to a motor, while the clutch's output shaft is connected to the mechanism that does th ...

es 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

Steregushchiy-class corvette The ''Steregushchiy'' class (), Russian designation Project 20380, is a ship class, class of corvettes being built for the Russian Navy. Designed by the Almaz Central Marine Design Bureau, subsequent vessels were built to an improved design (Pr ...

* Tuo Chiang-class corvette * Type 056 corvette Frigates * Formidable-class frigate * Frégates de taille intermédiaire * Jose Rizal-class frigate * La Fayette-class frigate * Lekiu-class frigate * Maharaja Lela-class frigate * Miguel Malvar-class frigate * RN Type-31 Inspiration-class * Tamandaré-class frigate *

Type 054A frigate The Type 054A (NATO/ OSD Jiangkai II) is a Ship class, class of guided-missile frigate from the People's Republic of China. It is a development of the Type 054 frigate; compared to its predecessor, the Type 054A has medium-range air defense capa ...

LSDs (landing ships, dock) * Whidbey Island-class dock landing ship LPDs (landing platforms, dock) * Endurance-class landing platform dock * Galicia-class landing platform dock * Makassar-class landing platform dock * Tarlac-class landing platform dock Amphibious Flat-topped Ships *

Dokdo-class amphibious assault ship The Dokdo-class amphibious assault ship () is a Ship class, class of landing platform helicopter (LPH) and Amphibious assault ship, amphibious assault ships operated by the Republic of Korea Navy (ROKN). It was designed and built by Hanjin Heavy ...

* Ōsumi-class dock landing ship FACs (fast attack-craft) * Clurit-class fast attack craft * Cyclone-class coastal patrol ship * Sampari-class fast attack craft Cruise Ships * MV Piano Land (formerly MV ''Oriana'')

References

{{reflist Marine propulsion Marine diesel engines