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Hi Dan.
Dooohhh! Of course! How could I have missed that?
The atmosphere around us is 14.7 (average) so even when the sub's hull was a
vacumm the atmosphere
on the OUTSIDE of the sub's hull would still only
be 14.7 and therefore could only push against the hull at 14.7 psi. As you say,
it would create an imbalance condition
but it would be unable to push any harder than 14.7
psi against the hull because that is all the pressure it has. Got it. That was a
tricky one. As a diver I should have
caught that one. Glad it wasn't on a dive test!
Thanks for keeping me straight.
Bill.
----- Original Message -----
Sent: Tuesday, October 25, 2005 7:59
AM
Subject: Re: [PSUBS-MAILIST] hull
test
Bill,
A sub on land near sea level has 14.7 PSI
(average) pushing on the outside of the hull and 14.7 PSI pushing on the
inside of the hull. It's in balance...... Correct?
Suck out the air from the inside, that is, remove
the 14.7 from the inside, and you create an imbalance condition. Zero
PSI on the inside and 14.7 PSI on the outside. Nothing
doubles!
Face it, there's no way to test a sub
at depth greater then 30 feet other then a pressure chamber or just
placing it at depth and see what happens!
Dan H.
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