[PSUBS-MAILIST] K3000 spherical shell calculations

[Sean T. Stevenson]

That really comes down to the effective use of space. Sphere is stronger, displaces less, weighs less for same depth, and is simpler (no stiffeners). However, diameter is the only factor you can change to play with available space, which you may not be able to use effectively. Cylinder allows you to play with both diameter and length, as as such is more versatile, but will be heavier for same depth and space, requires stiffening / more welding. Spheres are also difficult to fabricate to strict tolerance - either to spin them and carry extraneous weight to meet minimum thickness, or you press segments and weld them together, which allows better thickness control but is a lot of welding.

Sean


On April 14, 2014 1:09:37 PM MDT, swaters at waters-ks.com wrote:
>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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-- 
Sent from Kaiten Mail. Please excuse my brevity.
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