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Re: [PSUBS-MAILIST] Alternative hull material.
Have you considered a partial-submersible? There are
those designs that have pontoons that stay on the
surface, and in that way limit the depth. It isn't a
real submersible, but it would be safer, easier to
make, and will let you see the under-water sights.
Also,
this type of sub would really lend itself to
fiberglass.
Warren.
--- Ward Monroe <wardomon@minn.net> wrote:
> Thanks for the clarification. My bad. I should
> have said "1 atmosphere
> over ambient" to be more precise. As a kid I used
> to free dive with
> mask and fins to 10 feet all the time. It's a
> pretty good squeeze, but
> not a real problem. I would think that the
> strength, formability,
> durability, life span and hydrophobic qualities of
> fiberglass would be a
> safe material for the rather benign conditions at 8
> feet. And surely
> catastrophic compressive failure would not be an
> issue for a properly
> constructed shape. Seeing as weight is good, an
> overly thick hull
> should easily handle the stresses.
>
> Thanks for everyones comments. Back to lurking...
>
> On Mon, 2003-03-17 at 06:06, peter mckellar wrote:
> > Hi Ward,
> >
> > >Please correct me if I'm wrong, but isn't 33 feet
> 1 atmosphere? The
> > pressure at 8 feet is almost trivial.
> >
> > 0' = 1 ATM
> > 1 ATM = 14.7 psi
> > 33' = 2 ATM (2 ATM is actually 32.8')
> > 8' = 2.5m
> > = 1.25 ATM
> > = 18.4 psi (true, pretty trivial)
> >
> > i've rounded a little in the sums :)
> >
> > 14.7 psi seems higher than my faded pre-metric
> memories suggest. can anyone confirm this is
> correct?
> >
> > the conversions were done by:
> >
> > http://www.megaconverter.com/Mega2/
> >
> >
> > hope this helps
> > peter
>
>
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