If one used oak, not for the purpose of buoyancy, but for structural use, if
some water did manage to get into the sealed wood do you think it would have an
adverse affect on the wood?
----- Original Message -----
Sent: Monday,
April 23, 2007 18:34
Subject:
[PSUBS-MAILIST] Glass microspheres idea & why ?
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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