Peter
I think
that the Titanic / Bismarck timber decking would
have had plenty of time to absorb enough water to swell back to its original
size or larger and may have been made of a timber other than pine in the first
place. As a volunteer many years ago I helped recover some of the timbers from
the wreck of HMS Pandora. Oak Timbers from this wreck contracted by as much as
25% after being treated and dried out. They were negatively buoyant at the
time of recovery.
Having a
fair bit of experience with GRP boats my suggestion is that the major problem
with Pine would be it would loose the buoyancy it is there to create if it is
allowed to absorb water. It would also swell and damage the GRP it is enclosed
in and be subject to rot amongst other things. If you have ever replaced the
flooring in an old GRP boat that had a wooden frame, many of the problems I
have described are generally present.
Why not
just use Glass Micro Spheres and avoid these issues.
It is a
shame that you are not prepared to provide photos of the UC3 during its
various stages of construction. Several P-sub members I know have a particular
interest in what you are doing and what maybe unique engineering solutions you
may have implemented.
BTY:
Congrats on the arrival of your new Princess.
Regards
Steve
Pearce
-----Original
Message-----
From:
owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Peter Madsen
Sent: Monday,
23 April 2007 12:39
AM
To:
personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Glass
microspheres idea - why ?
In my limited knowledge -
flotation - that is extra incompressible buoyancy - is used only for ultra
deep dives. In my understanding tits used when a U-boats pressure hull gets so
heavy due to structural loads that it itself will not be buoyant. The classic
example of this would be the Trieste
bathyscaphe. Trieste used a
gasoline tank - absolutely incompressible - but not that efficient at - 250 kg
lift pr. m3.
Who do a psubs need this when the
designer is working in the 300 feet range ?? If he really needs it - my
practical idea would be to make use of wood.
Dry pine wood has a density of
about 500 kg / m3, and painted with epoxy or sealed with polyester /
fiberglass it would form a nice simple solution in the depth range we are
talking about.
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