[PSUBS-MAILIST] Stability & Buoyancy

[jimtoddpsub at aol.com]

John,
I had been hoping to hear your input.  Was here a stack extending down from the opening to mitigate burping?  -Jim

there was only a man hole size opening at the lowest point of the 
MBT.






-----Original Message-----
From: subvet596 <subvet596 at optonline.net>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Sent: Sat, Nov 30, 2013 9:28 pm
Subject: Re: [PSUBS-MAILIST] Stability & Buoyancy


Hi all:

When underway the Kingston valves were usually in the open position. I believe 
the US Fleet Boats were the last to have them. After WWII they were no longer 
installed, there was only a man hole size opening at the lowest point of the 
MBT.

John K.
(203) 414-1000
 
Sent via BlackBerry by AT&T

-----Original Message-----
From: Marc de Piolenc <piolenc at archivale.com>
Sender: Personal_Submersibles <personal_submersibles-bounces at psubs.org>
Date: Sun, 01 Dec 2013 09:45:22 
To: <personal_submersibles at psubs.org>
Reply-to: Personal Submersibles General Discussion
 <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] Stability & Buoyancy

That does have to be considered in design as well as in operation. Some 
sort of fluid interlock between the compressed-air valves and the 
Kingstons, I would think. Or a pilot valve driven by differential 
pressure that opens the Kingstons whenever the overpressure inside the 
MBT reaches a certain level. Can't think of any situation where you 
would want to be blowing WITHOUT having the Kingstons open.

Marc

On 11/30/2013 6:51 PM, MerlinSub at t-online.de wrote:
> Hi Alan,

> On the otherside a boat with Kingston and a
> compressed air blow out system can blow away the
> tanks very fast if you forget to open the Kingstons
> during blowing the tanks or have a air leak
> in the in the pipe to the tanks.
>
> vbr Carsten
>
>
> "Alan James" <alanlindsayjames at yahoo.com> schrieb:
>
>     Hi everyone,
>     While reading through some background info for the G.L.
>     certification document, I came across this link with a good
>     explanation of stability & buoyancy
>     http://maritime.org/doc/fleetsub/chap5.htm
>     There is a phenomena described, where submarines can be
>     unstable to the point of turning over during the transition from
>     surface to diving & vice versa.
>     This has to do with the centre of buoyancy moving upward past
>     the centre of gravity. As it approaches the centre of gravity the
>     submarine is at it's most vulnerable point.
>     This would be different for individual designs & a worry if
>     you dropped your emergency drop weight.
>     I had been told by a pilot that he never stuffed around while
>     descending & liked to drop as quick as he could.
>     I didn't have a full understanding of this & thought there may
>     be others in the same boat.
>     Regards Alan
>
>
>
> --
>
> Carsten Standfuß
> Dipl.Ing.Schiffbau @ Meerestechnik
> Heinrich Reck Str.12A
> 18211 Admannshagen
>
> 0172 8464 420
> WWW.Euronaut.org
> Carsten at euronaut.org
>
>
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