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Re: [PSUBS-MAILIST] riding the bubble

I have a lot of ballast volume, I think around 150 cu ft. .  I was planning on flooding my ballast tank completely and then be neutral buoyant,  but I think I'm going to be a little bit heavy.  I won't really know until I do some tests.  If I am heavy there are some options I can explore to remedy the situation.  In any event if I am too heavy I could simply not vent any more air out.  However, if I did vent out all my air I may be way too negative an that could be problematic.  
 
On riding the bubble, I always though that is was very difficult to maintain a constant depth because you're always fighting your upward or downward momentum, and with a changing volume of air it was hard to keep things level.
 
Brian

On Thu, Mar 3, 2011 at 9:01 AM, <vbra676539@aol.com> wrote:
Lots. Aquarius, for instance, has a small tank forward of the fwd. MBT which is utilized for trim. No hard tanks or internal VBTs. Gamma uses a small bubble in the mains, too, also with no VBT. The Nektons have done lots and lots of dives that way.
Vance




-----Original Message-----
From: ojaivalleybeefarm@dslextreme.com
To: personal_submersibles
Sent: Thu, Mar 3, 2011 6:20 am
Subject: [PSUBS-MAILIST] riding the bubble

Hi All,
              Does anyone have experience with trying to control a sub with primarily a soft ballast tank.  I know there is a point where the air becomes compressed to a point where one starts to lose buoyancy and then you're headed to the bottom but can it be controlled if you stay slightly positive and then use your trusters to keep you down?
&n