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

["Warrend Greenway" <dub@linuxmail.org>]

Doing some rough calculations I come up with 20% higher
cost to fabricate a hull this way. There is on other flaw
in the theory: How will you couple a, say, hatch collar, 
viewport flange, etc. through the hull layers? The stresses
at the junctions get astronomically high...

Warren.

> 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
> 

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