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Re: [PSUBS-MAILIST] K250 to K400 modification


Vance,
There is nothing that I said that can be implied I was
insinuating Hugh was a Dumb Chicken.
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.org
Sent: 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
 
 
From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Alan James
Sent: Sunday, 4 July 2010 4:44 p.m.
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] K250 to K400 modification
 
Hugh,
If you look at it carefully you'd see that you'd only
need the decompression times for a 150ft dive.
Alan
----- Original Message -----
From: Hugh Fulton
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?
 
 
From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Alan James
Sent: Saturday, 3 July 2010 10:55 a.m.
To: personal_submersibles@psubs.org
Subject: [PSUBS-MAILIST] K250 to K400 modification
 
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
to go to 400ft.
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.
Just thinking.
Alan
 
 
 
 


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