Reliability of ships

[davecttr]

Thanks again chengkp75, it is good to have you here with all your knowledge.

 

Latest news from Discovery is at the start of the problem they could only use 1 propulsion motor so no more than 13knots or so. they now can use both so have been doing 17 knots. She is in Goa today

[chengkp75]

4 hours ago, davecttr said:

Thanks again chengkp75, it is good to have you here with all your knowledge.

 

Latest news from Discovery is at the start of the problem they could only use 1 propulsion motor so no more than 13knots or so. they now can use both so have been doing 17 knots. She is in Goa today

Yes, that's due to one switchboard powering one propulsion motor, and the other switchboard powering the other motor.  This is an older, less desirable design, newer ships with shafted propellers use motors that have two windings in them, so each switchboard can provide half the power to each propulsion motor.  Result is nearly the same, reduced speed, but "trailing" one propeller is less efficient than half power on both.