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Thanks for the input Dilawar it was ALL quite helpful.
I was just wondering why or what reasoning the Brits thought two boilers were sufficient and the US decided on four in comparably sized and mission oriented ships. I was abit surprised when I noticed the difference.
I was assuming redundancy as one issue along with the issue I vaguely recall reading about of puttiing more boilers on line as greater speed was required.
As for two screws you are correct "maneouverability" is a factor I failed to mention. Thanks for pointing that out. As this was a criticism of the Knox class also.
I was focusing on cost constraints and redundancy but I surely should have mentioned the "maneouverability" issue.
Any other thoughts/info/sources/documents/articles/books etc on this topic would be greatly appreciated.
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