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<div><font style="background-color: transparent;">I heard you got about a 5% reduction on strength with rings in tension, rather than compression. But it's nice to have them out of the way, which makes it worth the effort in my opinion.</font></div>
<div>Vance</div>
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<div style="color: black; font-family: arial,helvetica; font-size: 10pt;">-----Original Message-----<br>
From: cast55 <cast55@telus.net><br>
To: Personal Submersibles General Discussion <personal_submersibles@psubs.org><br>
Sent: Thu, Oct 24, 2013 11:40 am<br>
Subject: Re: [PSUBS-MAILIST] K-600<br>
<br>
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<div dir="ltr">External rings will always give you a stronger hull compared to internal for the same hull thickness and ring spacing. The downside is that the welds have to be perfect, but any weld shrinkage that may occur actually acts to deform the hull in a way that increases its strength over that of the nominal geometry.</div>
<div dir="ltr">Sean<br>
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<div class="gmail_quote"><a href="mailto:vbra676539@aol.com">vbra676539@aol.com</a> wrote:<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex; border-left-color: rgb(204, 204, 204); border-left-width: 1px; border-left-style: solid;">
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<div><font color="black" face="Arial, Helvetica, sans-serif" size="3"><font style="background-color: transparent;">PC-8 has 3/8" wall thickness on the hull cylinder, the same as the 600, but was rated 200 feet deeper by ABS, even though it has a larger radius (21" as opposed to 18"). The ring stiffeners on the 8 are external and the conning tower larger. Makes you wonder what the deal is for figuring operating depth. Perry went to half inch for PS-2 which was the same boat but rated at 1000'. Hmmm.</font></font></div>
<div>Vance</div>
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<div style="color: black; font-family: arial,helvetica; font-size: 10pt;">-----Original Message-----<br>
From: greg cottrell <<a href="mailto:jgcottrell2002@yahoo.com">jgcottrell2002@yahoo.com</a>><br>
To: Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
Sent: Thu, Oct 24, 2013 10:24 am<br>
Subject: Re: [PSUBS-MAILIST] K-600<br>
<br>
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<div style="right: auto;"><span style="right: auto;">I thought that George said they were .625" but I could be wrong.<var id="yui-ie-cursor"></var></span><span style="right: auto;"></span></div>
<div style="right: auto;"><span style="right: auto;"></span> </div>
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<font face="Arial" size="2"><b><span style="font-weight: bold;">From:</span></b> Jon Wallace <<a href="mailto:jon.wallace@yahoo.com">jon.wallace@yahoo.com</a>><br>
<b><span style="font-weight: bold;">To:</span></b> Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> <br>
<b><span style="font-weight: bold;">Sent:</span></b> Thursday, October 24, 2013 10:14 AM<br>
<b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] K-600<br>
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<div class="y_msg_container"><br>
It was an engineer hired by the company that commissioned and purchased the 600. His calculation requirements for the heads came out a little bit thicker than what George had calculated. I believe George spec'd .5 inch and the company's engineer spec'd .5625 inch.<br>
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On Thu, 10/24/13, greg cottrell <<a href="mailto:jgcottrell2002@yahoo.com">jgcottrell2002@yahoo.com</a>> wrote:<br>
<br>
Subject: Re: [PSUBS-MAILIST] K-600<br>
To: "Personal Submersibles General Discussion" <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
Date: Thursday, October 24, 2013, 9:25 AM<br>
<br>
George attributed the miscalculation in the weight<br>
of the 600 to second guessing the thickness of the heads.<br>
His original design called
for thinner heads but<br>
someone (can't remember who) that George respected<br>
suggested that they should be thicker. George used the<br>
thicker heads and then found that the sub wouldn't<br>
float. He had the hull lengthened by Bath Iron Works to get<br>
the needed buoyancy back. He<br>
said he was amazed at how fast they turned the job around- I<br>
think it was only a few days.<br>
<br>
Greg<br>
<br>
<br>
<br>
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