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Vance,
On a serious note, I agree with you regarding
Hugh.
He's doing this submarine thing a couple of levels
above me.
I'm just building for recreational purposes &
in my spare time.
Hughs putting a lot on the line with his commercial
build.
Nailing down all the facts & building to ABS
specifications
with an original design must be incredibly
difficult & frustrating.
Hugh (who lives across town) is very safety
conscious & lets
me know if I'm out of line.
Regards Alan
----- Original Message -----
Sent: Monday, July 05, 2010 10:50
AM
Subject: Re: [PSUBS-MAILIST] K250 to K400
modification
So....what? Hugh isn't smart or brave? Hm. I had quite a different
impression of him.
-----Original
Message----- From: Alan James < alanjames@xtra.co.nz> To: personal_submersibles@psubs.orgSent:
Sun, Jul 4, 2010 6:12 pm Subject: Re: [PSUBS-MAILIST] K250 to K400
modification
Hi Hugh,
It's dangerous if it's not thought through
properly &
the dangers are not accounted for.
Alan
----- Original Message -----
Sent: Monday, July 05, 2010 7:17
AM
Subject: RE: [PSUBS-MAILIST] K250 to
K400 modification
Alan,
Fair enough you did put in an emergency but I would put more faith in tech
divers as they are familiar with the complex tables mixing of gas etc.
150 ft extra you would probably be narc’d. It is possible but so
is flying in a chair tied to a bunch of helium balloons. Dangerous
stuff. Hugh
If you look at it
carefully you'd see that you'd only
need the
decompression times for a 150ft dive.
----- Original
Message -----
Sent: Sunday, July
04, 2010 11:23 AM
Subject: RE:
[PSUBS-MAILIST] K250 to K400 modification
Alan,
That
would have to be the silliest idea you have come up with. Heard of
bends, decompression?
I am thinking
that it would be possible to turn a K250 or any
sub
into a
semi-ambient for an emergency situation where you
needed
Example --- Go
down to your 250 ft limit & turn on an ambient
system
at that
point, this pressurizes the cabin as you progressively
descend.
Theoretically
you could go another 150ft, down to 400ft.
I guess you'd
need a lot of tanks for a K250. Maybe more practical
for
Cliffs sub wich
is a bit smaller. You would need a dive computer for
decompression
calculations, an over pressure valve, a modification of
the life
support system wich could be as little as increasing the
O2
flow into the
cabin. Also the instrumentation would need to take
75psi.
The ambient
equalization system could be set up by having a outside
pressure
reading & an electronic system that fed air into the hull when
the outside
pressure was more than 125psi above the inside.
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