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

gearbox A transmission (also called a gearbox) is a mechanical device invented by Louis Renault (who founded Renault) which uses a gear set—two or more gears working together—to change the speed, direction of rotation, or torque multiplication/r ...

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 The Frégate de Défense et d'Intervention () or FDI, formerly denominated Frégate de Taille Intermédiaire () or FTI, is a programme launched in 2015 to produce a new class of first-rank French frigates to complement the . , five ships have bee ...

* Jose Rizal-class frigate *

La Fayette-class frigate The ''La Fayette'' class (also known as FL-3000 for "''Frégate Légère de 3,000 tonnes''", or FLF for ''Frégate Légère Furtive'') is a Ship class, class of general purpose frigates built by DCNS (company), DCNS in the 1980s and 1990s, oper ...

* Lekiu-class frigate *

Maharaja Lela-class frigate The ''Maharaja Lela''-class frigate, also known as the Littoral Combat Ship (LCS), is a class of six stealth frigates being built for the Royal Malaysian Navy, Royal Malaysian Navy (RMN). First announced as the Second Generation Patrol Vessel (SG ...

Miguel Malvar-class frigate The ''Miguel Malvar''-class frigate is a class of frigates designed and currently built by Hyundai Heavy Industries (HHI) for the Philippine Navy. It was previously known as the HDC-3100 corvette based on the company's product nomenclature syste ...

* 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