[PSUBS-MAILIST] K3000 spherical shell calculations

[Personal Submersibles General Discussion]

Hello everybody ,anybody, Les here , 
Attatched myself to this email for convenience (similar subject) been away from psubs for quite some time wanting to start again.
Now it might sound dumb, but I tried to follow the calc sheet for material and depth etc with ring stiffeners but ufortunately had a few problems, perhaps a sample calc attached to it would assist me and maybe others on how to use it correctly? 
In between time I do need to get a rough indication of the thickness of steel  and  approx size of  ring stiffener size and quantity, to roughly calculate the weight of what I wish to build, to see if what I want to do is feasible or not...WEIGHT IS CRITICAL for my project 
Can anyone help me please my reqirements are; 
A Sphere 2 meters diameter
A Cylinder attached to that 1.2m diameter x 4meters long
 ( I understand there will be a flaring attatchment to the sphere, however at this point for the exercise, just to calc the min weight that would be possible on these two items would be an indicator for me andd give me a mental appreciation of my limitations )
The desired depth is 300m, ( 984ft ) ( 452 psi ) or I could settle for 250 meters( 820ft ) ( 379 psi ) both maximum dive depth not crush depth.
Sorry to be  pain but can any-one help me 
Thank you 
Les

P.S. In for a penny in for a pound, guess I will make myself look completely dumb ....just as an indication, with something like the above how would I calculate the  
        volume hence the size required for soft tanks for maximum submergance  



----- Original Message ----- 
  From: swaters at waters-ks.com 
  To: Personal Submersibles General Discussion 
  Sent: Tuesday, April 15, 2014 4:39 AM
  Subject: Re: [PSUBS-MAILIST] K3000 spherical shell calculations


  Sean,
  I don't believe I know the geometry. I guess in short term, I am looking for the pros and cons on a deep submarine for cylinder with ribs compared to a sphere. 

  Thanks,
  Scott Waters 

    -------- Original Message --------
    Subject: Re: [PSUBS-MAILIST] K3000 spherical shell calculations
    From: "Sean T. Stevenson" <cast55 at telus.net>
    Date: Mon, April 14, 2014 11:24 am
    To: Personal Submersibles General Discussion
    <personal_submersibles at psubs.org>


    At present, it will calculate stiffened cylindrical hulls in the forward direction only. The optimization routine is not properly constrained yet. If you already know the geometry you want to use, no problem.
    Sean


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