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RE: [PSUBS-MAILIST] Isn't 'Mini book review.' anymore--pressure t est
I'm
getting into an area here that I don't know much about. But no, I'm not talking
about a stress gauge. I'm referring to a thin tube that allows you to track
air flow out of the hull as the hull compresses. I have not seen this done,
but I've read somewhere that's how they do it.
Regarding the maiden voyage, I believe Carsten extended an invitation to
me a long time ago, and I consider that an honor. But would
I go to 325m on a manned test? I think before giving you a straight yes/no
answer, we'd have to sit and go through risks and calculations for
a few hours. We're all risk takers or we wouldn't have this hobby. But
on the other hand I always try to make my risks calculated
risks. I think Carsten and I have both been on the conservative
side of such discussions in the past.
Alec
In einer eMail
vom 11.04.2002 23:02:00 (MEZ) - Mitteleurop. Sommerze schreibt
Asmyth@changepoint.com:
that they put a capillary tube out of your
sub and track the
compression of the hull. As soon as the compression goes
beyond a linear
relationship with the pressure, they stop. In other words,
they can stop
when the elastic limit of the material is reached, but before
making a
loud CRUMP sound.
Alec
Hi Alec,
This
"capillary tube" you mentioned above ? Is it what we call DMS a little wire
meander on a little plaster changing itīs resistor value due to stresses..
I suggest to Carsten to tape some off this DMS on the inner side of
the hull and monitoring the stress curve during pick up the test deep ... I
feel relatively secure with such a procedure to avoide complete hull failure
but Iīm afraid of some local leaks particulary on connectors and hull openings
and of course weldings...
Just last night I saw "DAS BOOT" again from
DVD... To make me fit for the ultimative challenge in my life ... test dive
with Carstenīs CSSX "THE PSUB" ... .-))
A unmanned test dive can
mean to lose a intact sub due to a failed release automatic (see Carstens
statement) but it can also mean to lose a sub due to a simple little leaking
valve ... easy to seal with just two turns with the right wrench..
In a
huge PSUB like CSSX I believe there is enough remaining space to manage some
leaks. (see "DAS BOOT")
But in a little box like Sgt. Pepper ... hmmm
...but the advantage is that small subs are easier to sink and easier to
salvage if complete filled with water...
Alec, would you be willing to
dive with CSSX up to 325m ? Sounds my thoughts like common sense?
What
preparations can be done to make such a testdive as sure as possible?
I
believe itīs secure against lost of control to go to the deep only by dynamic
downlift (whats the right word for the downward force from the dive plains?)
and with empty hard tanks. (GABLER described such a procedure in his book) The
sea bottom should be near the test deep of course.
Any failure in the
engine will cause surfacing and dive plans can only be shifted to up. At worst
case with empty hard tanks, dive plans up, full spead ahead and blowing the
soft tanks the sub will surface also with a greater leak like a rocket. The
only problem then are vessels on the surface.....
Thinking over this ever
and ever again I believe itīs relatively safe. Maybe more then drive a car in
the rushour monday morning....
A.