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

To: personal_submersibles@psubs.org

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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