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Re: [PSUBS-MAILIST] Re: Welcome, apologies and multi-hulls.

Hi People.
In an attempt to make up for my embarrasing, unhelpful, and 
narrowminded comments I made earlier. I would propose some 
more discussion on this idea of 'compartmentalising'.
(please excuse any spelling mistakes, I dont possess the 
apparent intellectual capacity of some giants on this list)

Is there any merit in using a multi-layer hull? 

For a single layer hull for an ambient machine, the pressure 
differential is at a maximum. If we were to use TWO layers 
(or more) in the pressure hull, and partially pressurise the 
layers in between, then is it not possible to sustain a 
greater TOTAL pressure differential?

I am now going to attempt to draw an ascii illustration..ahem.

The traditional method:

       |
Inside | Outside
   @   |    @
  1atm |  4 atm
       |


pressure differential = 3 atm.
Depth ~30m


A multilayer hull:

        |           |
inside  | Intermed. | Outside 
  @     |   @       |  @
 1 atm  |  4 atm    |  7 atm
        |           |

Pressure differential per layer is still at 3 atm. 
Outside depth ~ 70m

 If I have this right..I think I have it vaguely correct,
compartmentalising might be a really good way to get to 
greater depths. I know this sort of thing has been discussed 
before, but I am too lazy to look up the archives..
My apologies for any spelling mistakes Herve, I hope you can 
overlook them just this once.
If I have overlooked any fundamental physics of hydrodynamics 
and hydrostatics, please be nice!

Thanks!
EM.





---- Original message ----
>Date: Tue, 28 Jan 2003 16:21:43 EST
>From: BauWauHausDesign@aol.com  
>Subject: Re: [PSUBS-MAILIST] Re: Welcome to the 
Personal_Submersibles_Disc ussion  
>To: personal_submersibles@psubs.org
>
>   In a message dated 1/27/03 5:56:13 PM Pacific
>   Standard Time, dub@linuxmail.org writes:
>
>     Even if it increased to ambient, or even half of
>     ambient, you would not
>     be able to withstand the bodily strain at the
>     depths in question.
>
>     Warren.
>
>   provided that the pressure is ambiant. what if you
>   were able to stratify pressure zones without a
>   structural membrane (ie cockpit, pressure suit...)?
>   to say it is not possible is to deny many example in
>   nature that rely on non-compartmentalized stratified
>   pressure zones to exist.
>
>   jeffrey