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RE: [PSUBS-MAILIST] Ambient Variable Ballast Tank
Yes, I also have a translucent LP tank as a VBT in addition to the soft
tanks. It doesn't supply all of the volume needed but the LP tank can be
blown at depth. This comes in handy in situations like Jon mentioned
earlier- being able to adjust buoyancy at depth and even compensate for the
weight of objects retrieved.
Being able to see the level of water in the tank is a huge plus.
Greg
-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Smyth, Alec
Sent: Friday, May 25, 2012 11:57 AM
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] Ambient Variable Ballast Tank
Perhaps Greg Cottrell can tell us the specifics, but as I recall he uses
translucent, composite, LP tanks inside the cabin, and pumps water in or
out on the surface until neutral. I think it's a neat idea, if you have
space for the tanks. In Snoopy's case I wanted to make the boat a two
person, which meant I didn't have the space.
-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Jon Wallace
Sent: Friday, May 25, 2012 1:11 AM
To: personal_submersibles@psubs.org
Subject: [PSUBS-MAILIST] Ambient Variable Ballast Tank
I had a thought about VBT's today and not sure if we've discussed this
before. While it seems technically feasible I'm hoping other minds will
set me straight if I'm heading down an errant path. The problem is the
size and weight of a VBT made out of steel as in the Kittredge subs.
They are relatively small but also relatively heavy, and so the net
buoyancy is rather small, on the order of about 50 pounds. I started
thinking like Alec with his K-250 and figured for the benefit of only 50
pounds it likely is not worth the effort of rebuilding and putting that
VBT back on the 600 and I'd be better off just transferring lead as
necessary. Now I'm wondering if an ambient VBT would be feasible. Use
lighter material for the VBT (pvc pipe?) and an air compensated system
to adjust the internal pressure to always match water pressure. What
are the pitfalls of such a system?
Jon
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603-529-1100
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