[PSUBS-MAILIST] Hull Calc: 78" spheres

[swaters@waters-ks.com via Personal_Submersibles]

Sean,
I think I am getting the hang of this. The trick when it comes to 516 gr 70 seems to be getting the most boyancy with the biggest sphere, while still hitting 1000m. I now know a 1.25" sphere at 60" will hit 1000m, however is essentually boyant without putting anything in it requireing quite a bit of foam. My next question is would a 72" sphere at 1.25" reach 1000m within ABS requirements? Acording to my math it should be close, but my math is really primitive. If not looks like 60" at 1.25" is what it will have to be. 
Thanks,
Scott Waters


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-------- Original message --------
From: "Sean T. Stevenson via Personal_Submersibles" <personal_submersibles at psubs.org> 
Date:01/09/2015  10:46 PM  (GMT-06:00) 
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
Subject: Re: [PSUBS-MAILIST] Hull Calc:  78" spheres 

On 2015-01-09 20:56, swaters at waters-ks.com via Personal_Submersibles wrote
> Sean,
> Perhaps I am interperting these wrong. I thought if the pressure at working depth is lower than maximum allowable working pressure then it passes ABS rules. If pressure at working depth is higher than maximum allowable pressure then it does not pass ABS rules. What am I looking for on these?
> Thanks,
> Scott Waters

The solutions I have posted will always show the pressure at working
depth and the maximum allowable working pressure as being approximately
identical.  These are the final values when the solver arrives at a
solution, differing only by the discrete nature of the iterative process
(adding either 0.0001 m of shell thickness or 0.1 m of working depth on
each iteration, depending on the selected mode).  Every one of the
posted solutions meets the ABS requirements - some just don't meet your
desired working depth, or your desired shell thickness.

Sean



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