[PSUBS-MAILIST] Hull Calc: 78" spheres

[Alan James via Personal_Submersibles]

Hank,do you know what aluminum they are & is that 60" OD?I will put it through my calculator if I have the material in the data base. But not till after BBQ; nice hot day here in Auckland:)Sean might beat me to it & have  a more reliable result.Alan
      From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Saturday, January 10, 2015 4:16 PM
 Subject: Re: [PSUBS-MAILIST] Hull Calc: 78" spheres
   

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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