[Alberg30] Sally Ship

[Gordon LACO]

Yes, 

That was an inclining experiment aboard HMS Tecumseth.

Gord

on 6/9/03 2:20 PM, Robert Kirk at isobar at cablespeed.com wrote:

> Amy & David Swanson wrote:
> 
>> I wraote a paper for a history a couple of years ago about a 17th century
>> Swedish warship called the Vasa, which sank on its maiden voyage.  The ship
>> was top heavy, and when the first gust of wind hit her, over she went.
>> 
>> Anway, one interesting thing I learned was that the standard test for
>> stability back then was to have 100 men run back and fourth across theship
>> three times.  The test was cancelled after one round on the Vasa because it
>> appeared it would capsize.  I am amazed to hear that modern warships undergo
>> testing thesame way.
> 
> Sorry if I gave the impression that sallying ship was a standard operation
> with modern warships. It's a perfectly legitimate way of estimating your
> metacentric height (stability) with a straightforward equation, but as far
> as I know, it's not generally done anymore. I did it more for
> the  challenge and with the blessing of an impish skipper.
> 
> The usual stability measurement is called an "inclining experiment" and
> generally done only on the first ship of a class to get a baseline.
> Sometimes it's done after an extensive overhaul with lots of gear replaced,
> but not always, if time & money are short. Naval ships are held to a pretty
> strict "class rule" where you can't make alterations without the direction
> of the Bureau of Ships (called a SHIPALT) and you have to report back to
> them when it's done. There's a little lady in the basement of the Bureau
> who keeps a spreadsheet on each ship and records the changes and calculates
> its new stability values after each change and warns the Admiral if a ship
> is approaching its minimum stability.
> 
> The inclining experiment is done much like Gordon's description about HMS
> Tecumseth. In the Navy's case  they substitute massive multi-ton weights
> instead of weighing a bunch of sailors, but the principle's the
> same.  Which makes me wonder how or if they do an inclining experiment with
> an aircraft carrier. They'd need a couple of thousand tons of weights.
> Maybe they do something else?
> 
> Bob Kirk
> Isobar #181
> 
> 
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