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On Fri, 3/24/17, Rupert Boleyn <xxxxxx@gmail.com> wrote:

 Subject: Re: [TML] starting your ship
 To: xxxxxx@simplelists.com
 Date: Friday, March 24, 2017, 1:51 PM

 On 24Mar2017 0628,
 Timothy Collinson wrote:

 > [3] I ask this because evidently my
 subconscious was remembering the
 > (very
 very old) ship I spent two years on (which I'm pretty
 sure could
 > NOT be started from the
 bridge!), got best fuel economy at something
 > like 12 knots instead of the 20(?) I think
 it was capable of.

 Aside
 from ships using nuclear power, just about all will be
 rather more
 fuel-efficient at a lower speed
 than their maximum. Exactly what this is
 will depend on their size, hull form, and
 power. For a non-planing hull
 that
 isn't massively over-powered something around 1/4 of
 maximum power
 will get you half maximum
 speed.

 --
 Rupert Boleyn <xxxxxx@gmail.com>
 Chief Assistant to the Assistant Chief

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I recall reading somewhere that it took a really, really massive increase in SHP to get the Iowa class BB's an extra, what, 5 knots faster than the NCarolina class. In fact, as I recall, most of the increase in displacement was due to the increase in power required.

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