RE: [PSUBS-MAILIST] Reverse engineering

["Eliezer Rodriguez" <eliezer_rodriguez@hotmail.com>]

Alec;

Could you also send me copy of these formulas?

Eliezer Rodriguez
"The only thing in life to fear is fear itself."



>From: Alec Smyth <Asmyth@Changepoint.com>
>Reply-To: personal_submersibles@psubs.org
>To: "'personal_submersibles@psubs.org'" <personal_submersibles@psubs.org>
>Subject: RE: [PSUBS-MAILIST] Reverse engineering
>Date: Tue, 4 Dec 2001 10:32:01 -0500
>
>Uh-Oh, this is the famous plastic coke bottle question again. Take one of
>those and fill it with compressed air, and you will find it withstands
>hundreds of psi. But take it underwater with you on a scuba dive (external
>pressure) and it will collapse before you know it. External pressure
>resistance is NOT calculated from internal pressure resistance. They are 
>two
>entirely different things.
>
>I'm afraid the "formula" for external pressure is actually a number of 
>pages
>worth, because it depends on lots of variables like diameters, length,
>material, etc., etc. You can readily calculate the depth rating of 
>cylinders
>and speres, but anything else is hard. I'll send you scans of all the
>formulas off list, and the spreadsheet on PSUBS automates the same
>calculations.
>
>"Reverse engineering" is something quite different. That refers to taking
>something apart and creating the design from the finished product, rather
>than building a product from a design. When I was an engineering student in
>Argentina, one of my colleagues worked at a tank factory. His assignment 
>was
>to take the fire control circuitry from a Leopard II tank (purchased from
>Germany) and figure out the design so replicas could be built without 
>paying
>the royalties.
>
>cheers,
>
>- Alec
>
>-----Original Message-----
>From: Floridarobots@aol.com [mailto:Floridarobots@aol.com]
>Sent: Tuesday, December 04, 2001 8:29 AM
>To: personal_submersibles@psubs.org
>Subject: Re: [PSUBS-MAILIST] Reverse engineering
>
>
>
>
>Question.....  What is the formula to calculate reverse engineering on a
>pressure hull ?
>
>If a Co2 tank is rated for say 1000 PSI of outward pressure from the 
>inside,
>what would it be rated for  as far as pressure from the outside ? Sorry if
>this sounds like a dumb question, Im not sure if there is a calculation for
>this....
>Tom
>


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