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[PSUBS-MAILIST] Re: sub
Maybe I am thinking about this wrong but in my mind a round sub that you
would roll around in would not work. It would have to be perfectly round on
the outside sice any gear on the outside wou ld ruin the perfict ball and
get caught on things or smashed. which means that all equipment/gear would
have to be on the inside, but the same principles apply to the inside, the
inside would have to be perfectly round to so you could walk around, so any
gear on the outside would be rolling around on, and any gear on the inside
you would be tripping over. There is probably away around this but I can't
see it. The way I am picturing it I took a hamsters ball. Imagined being
inside and running around. (Was a scary though) If you add anything to the
outside the ball is no longer round and anything on the inside you would
have to run and jump over and that would be difficult. The only way I can
see to solve the problem was if all the gear is suspended so you would have
the ball with a metal axel through it and everything would be on that. This
way when the ball rolled everything would say right side up. Probably with
this is that you could only go one direction. To me can't see how it would
work, But don't let me stop you from trying there is probably a way to do it
that I'm not thinking about. Another thing i just thought of is that
everything would have to be dirctly in the center if any weight was near the
outside then the ball would automatically roll so that the heavyest weight
is on the ground. That means that you have to be able to lift this weight.
Now your talking rolling the ball around plus lifting the weight then when
it came down you would get a burst of speed that if you weren't read for
would trip you up. To me if you can get by everything i said then great,
and i hope you can But just remember your gonna need alot of leg work.
Matt Cadieux
----- Original Message -----
From: "Sean T. Stevenson" <ststev@uniserve.com>
To: "Lew Clayman" <lew_clayman@yahoo.com>; <personal_submersibles@psubs.org>
Sent: Wednesday, August 08, 2001 8:55 AM
Subject: Re: [PSUBS-MAILIST] Re: sub
> I'd hate to be the one to have to do the stress analysis on a
rhombitruncatedicosadodecahedronic pressure hull...
>
> -Sean
>
>
> On Wed, 8 Aug 2001 08:15:26 -0700 (PDT), Lew Clayman wrote:
>
> >--- "Michael B. Holt" <mholt@richmond.edu> wrote:
> >> What was done was a sphere of hexagonal pieces of plexiglas were
> >> assembled into a ball. One entered the sphere through a
> >> door made of the hexagons, and then one walked away across
> >> the surface of the water. So the idea itself is not impossible.
> >
> >Please provide that link!
> >
> >The geometry might be a little more involved... something close to a
sphere can be achieved with a
> >combination of hexagons and pentagons (20 hexes & 12 pents IIRC), look at
a soccer ball for an
> >example. A reasonable spheroid can be done with 20 matching triangles,
five meeting at each
> >corner; slighly less round (but therefore perhaps better for the
purpose?) is possible with 12
> >pentagons, three meeting at each corner. This all has to do with the
"Platonic solids" if anybody
> >cares about the mathematics.
> >
> >There are (literally) infinite possible variations with two or more flat
shapes. And of course
> >faceted near-cigar-shapes and whatnot are possible too.
> >
> >I wonder, though - if you build a faceted submersible, it seems to me
that the pressure on the
> >hull will be distributed very unevenly - seams vs middle of facets vs
corners etc - could be a
> >source of weakness, no? And many seams equals lots of work, too.
> >
> >A faceted sub would also seem inefficient in terms of drag, again seams
and discontinuities make
> >for turbulence and for pressure gradients which might create spurious
"lifts" in odd directions,
> >making for steering issues as well as for drag.
> >
> >Or do I miss the point completely (hardly difficult to believe!)
> >
> >-Lew
>
>
>