page_title: Combined diesel and diesel
hierarchical_section_title: Combined diesel and diesel
caption_attribution_description: Diagram of a single shaft CODAD system. Note that a real CODAD system would have a different gearbox and clutch arrangement. (Own work) en:Combined diesel and diesel pl:CODAD
context_page_description: Combined diesel and diesel is a propulsion system for ships using two diesel engines to power a single propeller shaft. 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 diesel engines have somewhat better specific fuel consumption at 75% to 85% max output than they do at only 50% output, and 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.
context_section_description: Combined diesel and diesel (CODAD) is a propulsion system for ships using two diesel engines to power a single propeller shaft. 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.
caption: Principle of a CODAD propulsion system
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