[PSUBS-MAILIST] Hull Calc: 78" spheres

[hank pronk via Personal_Submersibles]

just to make things interesting.  I found two aluminum 60 in spheres 3 in thick wall and maybe 6 in thick flange.  They appear to be cast and perfectly round.
Hank--------------------------------------------
On Fri, 1/9/15, Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: Re: [PSUBS-MAILIST] Hull Calc:  78" spheres
 To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
 Received: Friday, January 9, 2015, 10:07 PM
 
 
     On 2015-01-09
 18:16,
       swaters at waters-ks.com
 via Personal_Submersibles wrote:
 
     
     
       Sean,
 Can I ask you to do one more calc for me? 516 gr 70 sphere,
 1" thick, 72" diameter. 
 The 78" was not within ABS rules at 1000m. I think the
 72" might just make it, yet give me more boyancy than
 the 60"
 Thanks,
 Scott Waters
 
     
     Not sure where you're going with this.  The
 60" sphere doesn't even
     make it at 1" thickness.  A 72" definitely
 won't.
 
     
 
     72" OD, 1" wall, ASTM A516 Grade 70:
 
     
 
     
 
     
 
     Just out of interest, I checked how small a sphere with
 1" thick
     hull would need to be to get you to 1000m.  Turns out
 it's about 50
     inches:
 
     
 
     
 
     
 
     Sean
 
     
 
   
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