<html><head></head><body><p dir="ltr">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.</p>
<p dir="ltr">Sean<br>
</p>
<br><br><div class="gmail_quote">On April 14, 2014 1:09:37 PM MDT, swaters@waters-ks.com wrote:<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<span style="font-family:Verdana; color:#000000; font-size:10pt;"><div>Sean,</div>
<div>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. </div>
<div> </div>
<div>Thanks,</div>
<div>Scott Waters </div>
<div> </div>
<blockquote id="replyBlockquote" style="FONT-SIZE: 10pt; FONT-FAMILY: verdana; COLOR: black; PADDING-LEFT: 8px; MARGIN-LEFT: 8px; BORDER-LEFT: blue 2px solid" webmail="1">
<div id="wmQuoteWrapper">-------- Original Message --------<br />Subject: Re: [PSUBS-MAILIST] K3000 spherical shell calculations<br />From: "Sean T. Stevenson" <<a href="mailto:cast55@telus.net">cast55@telus.net</a>><br />Date: Mon, April 14, 2014 11:24 am<br />To: Personal Submersibles General Discussion<br /><<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br /><br />
<div dir="ltr">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.</div>
<div dir="ltr">Sean<br /></div>
<hr />
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