<font color='black' size='3' face='Arial, Helvetica, sans-serif'>The first full size Nemo hull (66" OD) was tested to destruction (leaving a breathtakingly expensive pile of plexiglass in the bottom of the test tank). Hull number two was used for Nemo, which was an anchored, vertically mobile (on board winch), self powered observatory, man rated to 600 feet. It was little more than an experimental vehicle, and saw little service, all things considered. In any case, it was a huge design departure for its time, and is still on display somewhere or other, I forget where. It's covered extensively in Jerry Stachiw book. The evolutionary extension of Nemo was the 1st Johnson Sea Link hull. It was 4" thick instead of 2 1/2" but otherwise the same in geometry, fabrication, and bonding method. That hull was tank tested for manned service to 3000' feet but never used in practice beyond 1000'. Further study and lots of field experience taught us that it was a good thing, too. The 4" thickness lacked sufficient resistance to stress cracking at 3000'. Harbor Branch came within about a skinny inch of finding that out the hard way. Thus the 5 1/4" replacement hulls, similar to what Triton still uses today.
<div>Vance<br>
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<div style="font-family:helvetica,arial;font-size:10pt;color:black">-----Original Message-----<br>
From: Alan via Personal_Submersibles <personal_submersibles@psubs.org><br>
To: Personal Submersibles General Discussion <personal_submersibles@psubs.org><br>
Sent: Thu, Sep 28, 2017 6:00 pm<br>
Subject: Re: [PSUBS-MAILIST] Aston Martin Has Unveiled a $4 Million Submarine<br>
<br>
<div id="AOLMsgPart_1.2_3c5f647a-c7a9-4295-bcaa-7e1261a09570">
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<div>Roberto,</div>
<div>it was called Nemo. Had pentagonal sections bonded.</div>
<div>I am vague on whether there was one or more made.</div>
<div>Here is a paper on the testing of it.</div>
<div><a target="_blank" rel="noopener noreferrer" href="http://www.dtic.mil/dtic/tr/fulltext/u2/715345.pdf">http://www.dtic.mil/dtic/tr/fulltext/u2/715345.pdf</a></div>
<div>I recall mention of it in the Stachiw book.</div>
<div>
<div class="aolmail_kno-ecr-pt aolmail_kno-fb-ctx aolmail__sdf" style="overflow: hidden; line-height: 20px; margin-bottom: 0px; position: relative; transform-origin: 0% 0%;"><span style="background-color: rgba(255, 255, 255, 0);">Handbook of Acrylics for Submersibles, Hyperbaric Chambers, and Aquaria</span></div>
<div class="aolmail__gdf aolmail_kno-fb-ctx" style="overflow: hidden; line-height: 20px; margin: 0px;"><span style="background-color: rgba(255, 255, 255, 0);">Book by Jerry D. Stachiw.</span></div>
</div>
<div class="aolmail__gdf aolmail_kno-fb-ctx" style="overflow: hidden; line-height: 20px; margin: 0px;"><span style="background-color: rgba(255, 255, 255, 0);">Did you get your free copy? Jon was advertising this!</span></div>
<div class="aolmail__gdf aolmail_kno-fb-ctx" style="overflow: hidden; line-height: 20px; margin: 0px;"><span style="background-color: rgba(255, 255, 255, 0);">Hope this puts you on the right track.</span></div>
<div class="aolmail__gdf aolmail_kno-fb-ctx" style="overflow: hidden; line-height: 20px; margin: 0px;"><span style="background-color: rgba(255, 255, 255, 0);">Alan</span></div>
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<div>Sent from my iPad</div>
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<div><br>
On 29/09/2017, at 9:28 AM, roberto alvarez via Personal_Submersibles <<a target="_blank" rel="noopener noreferrer" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br>
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<div dir="ltr">Did some one have the link to the plexiglass sphere submersibles made on the 70's using the plexiglass sections to form the sphere', is a navy document on pdf, i forgot the name, thank´s</div>
<div class="aolmail_gmail_extra"><br>
<div class="aolmail_gmail_quote">2017-09-28 12:52 GMT-07:00 Alan via Personal_Submersibles <span dir="ltr"><<a target="_blank" rel="noopener noreferrer" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>></span>:<br>
<blockquote class="aolmail_gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div>Pete,</div>
<div id="aolmail_m_4523984784395374102AppleMailSignature">I see they are partnering with Triton to do this, so imagine</div>
<div id="aolmail_m_4523984784395374102AppleMailSignature">it's just a more sexier look to a Triton submersible.</div>
<div id="aolmail_m_4523984784395374102AppleMailSignature">Alan<br>
<br>
Sent from my iPad</div>
<div>
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<div><br>
On 29/09/2017, at 8:40 AM, Pete Niedermayr via Personal_Submersibles <<a target="_blank" rel="noopener noreferrer" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>> wrote:<br>
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<div class="aolmail_m_4523984784395374102card-description" style="font-size:11px;line-height:15px;color:#999;word-break:break-word">The British car company plans to begin revving its engines under water.</div>
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