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Hi Carlos,
Here's a link to California plastics, who advertise
that they do domes thicker than 1/4".
From what I can gather they have standard molds
they vacuum mold into.
If the dome is 1/4" it's probably about 1/3 of that
at the apex (top of dome).
The pressure on the dome will be all from the
inside & the pressure will be dependent
on how you set up your ambient equalizing system.
Depending on the depth of your hull
& where & how the ambient equalization
system is set up, you could see 500lb internal
pressure over the area of the dome. There is a guy
who has just built a wooden replica
sub with a bottom
hatch for diver exit. When the internal pressure
reaches the point
where the bottom
hatch is able to be opened, his 20"x20" top hatch
will be seeing 900lb
pressure.
I'm not an ambient expert, but from what I've seen,
there's two ways of doing the life
support. You either dive with a regulator in your
mouth (all of the dive) or flow through air
at 3 times your
respiratory minute volume. So three x what you calculated.
Not sure what you meant by using your air space as
buoyancy.
Here's a link to the "Fugusub" home page. It's an
ambient & there is a lot of information
on the site.
Regards Alan
----- Original Message -----
Sent: Saturday, June 26, 2010 2:40
AM
Subject: Re: [PSUBS-MAILIST] Heads up for
those needing batteries
Alec, I'm finally starting to build my 1 person ambient sub after the
completion of
my ROV. For my top dome I plan on using 1/4 thickness in Acrylic for a
24'' diameter
by 12" high dome. Do you think this would be adequate. Also, I plan on
using a
calibrated flow meter set to deliver 12.5 liter/min of air based on
my calculations
for my "minute volume" at rest, and, should I use "my airspace" for
buoyancy or
should I go with an exterior ballast tank? Let me know what you
think,
Thanks, Carlos
On 6/23/10, Smyth,
Alec <Alec.Smyth@compuware.com>
wrote:
Snoopy is about to get four new AGM batteries,
and I've been shopping around quite a bit. I usually avoid West Marine at
all costs, because they're super pricey. Yet for AGM batteries in
particular, for some reason they're highly competitive. Elsewhere I'm seeing
group 24 AGMs typically priced around $300 and in one instance $420. At West
Marine they're going on sale tomorrow at $170.
Cheers,
Alec
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