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 f ...

system for

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

s using two

diesel engine The diesel engine, named after Rudolf Diesel, is an internal combustion engine in which ignition of the fuel is caused by the elevated temperature of the air in the cylinder due to mechanical compression; thus, the diesel engine is a so-ca ...

s to power a single

propeller shaft A drive shaft, driveshaft, driving shaft, tailshaft (Australian English), propeller shaft (prop shaft), or Cardan shaft (after Girolamo Cardano) is a component for transmitting mechanical power and torque and rotation, usually used to connect ...

. A

gearbox Propulsion transmission is the mode of transmitting and controlling propulsion power of a machine. The term ''transmission'' properly refers to the whole drivetrain, including clutch, gearbox, prop shaft (for rear-wheel drive vehicles), differe ...

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

Guaicamacuto-class patrol boat The ''Guaicamacuto''-class patrol boats (Avante 1400) is a class of offshore patrol vessels or BVL ( es, Buque de Vigilancia de Litoral) in Venezuelan Navy service for patrol duty in economic exclusive zone. A contract for four BVLs and four POV ...

Type 31 frigate The Type 31 frigate or Inspiration class, and formerly known as the Type 31e frigate or General Purpose Frigate (GPF), is a planned class of frigate intended to enter service with the United Kingdom's Royal Navy in the 2020s alongside the subm ...

Steregushchiy-class corvette The ''Steregushchiy'' class (russian: Стерегущий, , Guarding), Russian designation Project 20380, is a class of corvettes being built for the Russian Navy. Designed by the Almaz Central Marine Design Bureau, subsequent vessels were b ...

Jose Rizal-class frigate The ''Jose Rizal''-class of multi-role guided missile frigates, currently in service with the Philippine Navy, are a heavily modified variant of the ROK Navy's s. The ships, which were built by Hyundai Heavy Industries (HHI), are specifically a ...

* Frégates de taille intermédiaire *

Type 054A Frigate The Type 054A (NATO/ OSD Jiangkai II) is a 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 capability in th ...

Doha-class corvette The Doha class (or ''Al Zubarah'' class) is a class of corvettes built by Fincantieri for the Qatari Emiri Navy. Development Fincantieri showcased for the first time the multi-role air defence corvettes for the Qatari Emiri Navy during DIMDEX 2 ...

References

{{reflist Marine propulsion Marine diesel engines