Steve Crandell wrote:Interesting ideas and a number of reasons for reduced propulsion power.
However, I don't understand why it would be necessary to reduce speed to retain steerage. Ever. The faster you go, the more effective a given rudder is at maintaining course, right?
A lot of that is dependent upon rudder location. Typically rudders are placed behind the screws to enhance flow and turning rates at low speed.
If I had to guess they were having lubrication cooling issues, turbine over-speed trips, problems maintaining condenser vacuum (those things have to be drained and cleaned several times a year, tube by tube, x many thousands) or a steam line rupture. The steam line would be one of the more hairy situations as you'd have to shut off the main steam stops out of the boilers until you figure exactly what systems are damaged and what cross-connect line-ups are still viable. This was probably the worst case engineering scenario we had. Super-heated steam pouring into confined spaces...