RE: [PSUBS-MAILIST] Hard ballast inside P. hull

["Steve McQueen" <psub101@indy.rr.com>]

I have seen/dove in a sub where the MBT was internal and also served as a
stiffening ring (think of a hollow circular stiffening ring that fills with
water).  I liked this design because you are getting the stiffening benefit
and not really sacrificing an unreasonable amount of interior space.
Steve

-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Jon Wallace
Sent: Wednesday, February 29, 2012 3:04 PM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Hard ballast inside P. hull


The K-250 uses an internal hard ballast tank but as Hugh pointed out space
inside the cabin is usually limited and internal ballast tanks can consume a
lot of valuable space.  There is the additional concern of introducing a
point of failure into the cabin that could prove deadly if a leak occurs via
either a valve, gauge or the tank itself.  Located on the outside such a
problem can be corrected by dropping the emergency weight, but if located on
the inside you run the risk of cabin flooding and sinking the sub.

Jon


On 2/29/2012 1:24 PM, ojaivalleybeefarm @dslextreme.com wrote:
> Hi,
>                I'm thinking of having my hard ballast located inside 
> my pressure hull and controlling it's contents with air pressure.  So 
> I guess it will have to be rated equal to my pressure hull.  One 
> reason for doing this is simply for logistics as far as how my sub is 
> laid out and how I have to locate things.  I could change this in the 
> future to have the hard ballast outside if I can find a good place for 
> it..
>   I was toying around with the idea of having fore and aft trim tanks 
> using hydraulic fluid as the medium for transferring weight fore and 
> aft.  That way I wouldn't have to worry about corrosion in the pump, 
> even though the oil would not have the weight of water.
>   Is locating a hard ballast inside the pressure hull a common thing 
> to do?
> Hugh, any thoughts?
> Brian




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