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Jon,
Where are you talking about locating the VBT (internal/external)? Are
you planning to use it only to adjust for the presence/absence of a passenger or
for broader purposes?
Jim T
In a message dated 5/25/2012 12:11:50 A.M. Central Daylight Time,
jonw@psubs.org writes:
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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