----- Original Message -----

> From: John Dallman <[email protected]>
> 
> On Mon, Feb 17, 2014 at 7:41 PM, Onno Meyer <[email protected]> wrote:
>>>  > Re [COGAG], wikipedia seems to disagree on the Arleigh Burke.
>>>  I see it listed with four gas turbines and two shafts. While COGAG
>>>  isn't specifically mentioned, I think it's a logical 
> assumption.
>>  http://en.wikipedia.org/wiki/Combined_gas_and_gas
>>  doesn't list it.
>> 
>>  Absence of evidence is no evidence of absence, but google gives
>>  no good hit, either. Not enough google-fu, maybe.
> 
> COGAG is sometimes used to mean that a ship has two different models
> of gas turbine for cruising and sprinting. The Arleigh Burkes have
> four turbines, all the same model, but I bet they can declutch one
> from each shaft.


Hmm. The way I wrote it, COGAG means 'gas and gas' -- all turbines on a shaft 
must be run. COGOG -- 'gas or gas' means they don't have to both run at the 
same time.

Brandon
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