Combined diesel and diesel explained

Combined diesel and diesel (CODAD) is a propulsion system for ships using two diesel engines to power a single propeller shaft.

System

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.

CODAD vessels

Passenger and Car Ferry Ships

• M/F Povl Anker

Containerships

• MV ACX Crystal

Coast Guard Offshore General-Purpose Cutters

• Iwami-class patrol vessel
• Shiretoko-class patrol vessel
• Tanjung Datu-class patrol vessel

Coast Guard Offshore Security Patrol Cutters

• Mizuho-class patrol vessel
• Ojika-class patrol vessel

Coast Guard Multi-mission Cutters

• Kunigami-class patrol vessel
• Teresa Magbanua-class patrol vessel

Coast Guard Interceptor Cutters

• Aso-class patrol vessel
• Hateruma-class patrol vessel
• Hida-class patrol vessel
• Anping-class cutter
• Tsurugi-class patrol vessel

Coast Guard Security Cutters

• Heritage-class cutter
• Mizuho (PLH-41)
• Shikishima-class patrol vessel

Patrol Corvettes / Navy OPVs

• Guaicamacuto-class patrol boat
• Kedah-class offshore patrol vessel

Corvettes

• Bung Karno-class corvette
• Bung Tomo-class corvette
• Diponegoro-class corvette
• Doha-class corvette
• Jacinto-class corvette
• Kasturi-class corvette
• Laksamana-class corvette
• Parchim-class corvette
• Steregushchiy-class corvette
• 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^[1]
• Tamandaré-class frigate
• Type 054A frigate

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
• 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)

Notes and References

1. Web site: Babcock wins £1.25bn Type 31 frigate contract . 12 September 2019 . The Engineer . 12 October 2019.