CODAD
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 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.
Ship classes29
1
2,419 t
99 m
22 knots
60
6
2,419 t
99 m
24 knots
60
5,700 t
138.7 m
28 knots
100
3
6,645 t
138.7 m
30 knots
165
4,460 t
122 m
27 knots
110
6
915 t
71.3 m
30 knots
55
1
3,100 t
111 m
28 knots
138
4
2,500 t
102 m
28 knots
65