[PSUBS-MAILIST] Hard ballast inside P. hull

["ojaivalleybeefarm @dslextreme.com" <ojaivalleybeefarm@dslextreme.com>]

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