[Alberg30] Sally Ship

[Alan B Schulman]

Scroll to the bottom at this URL and you'll see what I infer
is an inclining experiment to a carrier.  Amazing!

http://www.latitude38.com/LectronicLat/2003/0603/June02/June2.html#anchor1085433

Alan

Well, it's probably just horsing around but,,,,,

Robert Kirk 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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