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Maybe I'm missing something.
Why all the fuss to build a sub that you need to be
careful not to surface all the way before shifting air from one place to
another.
First of all you can't control your depth that
easily. You don't always have the option of stopping your assent as 33
feet or where ever as a diver does. Some times you hardly know your moving
until you see the surface right there a foot above you. If you put in
safety valves to release any positive pressure you had in the hull in case you
rise to close to the surface and they release air, you won't have the
air to put in the tanks later on.
Since your building a pressure hull anyway, why not
use 1/4 inch plate instead of 3/16, or whatever. Build a one atmosphere
sub. You'll have a safer sub and a simpler sub to
operate with no need to take extra precautions with hatches,
viewports, and valves for an internal positive pressure
situation.
Please explain if I'm missing
something.
Dan H.
----- Original Message -----
Sent: Wednesday, November 16, 2005 12:14
PM
Subject: [Norton AntiSpam] Re:
[PSUBS-MAILIST] Re: Variable Ballast Calculations, Bill
On 11/15/05, Akins <lakins1@tampabay.rr.com> wrote:
... So imagine yourself at only 2 atm or 33 ft
of pressure on your body, but actually diving to 99 feet and staying
for a maximum of 205
minutes without any deco! Wouldn't we scuba
divers love it if we could do that! A
hybrid like this would allow us to. I would say it would be worth the extra
trouble. What do you think Paul?
I'm with you Bill, sign me up for a pressure-limited cabin! But
I am starting to wonder why not just limit it to 1atm. :-) Once I start
thinking about building a crew compartment that handles 3atm and maybe 1atm of
overpressure, well it seems like why not just build a traditional 1atm
boat? But this hybrid sub design is fascinating and I'd like to see it
sketched out.
Now I would like to know what hull strength I
would need for a 1 atm pressure vessel to withstand 2 atm of outside water
pressure. Probably have to build it with a safety factor for 3 or so
atm
just to make sure it was safe. I wonder what
steel thickness I would need or if a 1/2 inch thick kevlar wing tank
would withstand 2 or 3 atm with 1 atm inside it? Any help here
fellas?
Well that's the rub, isn't it? My feeling is that many
engineering types would be comfortable designing something for themselves to
use but would be pretty hesitant to give someone else recommendations on
pressure vessel details. Is that right? Sorry I haven't been on
this mailling list long enough to know what's been done and discussed in the
past and I didn't find anything on PSUBS.org or by searching it with
Google.
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