<div dir="ltr">Thanks Jon. Interesting, if a bit risky.</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, 29 Sep 2020 at 12:47, Jon Wallace via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div style="font-family:"times new roman","new york",times,serif;font-size:16px"><div></div>
<div dir="ltr">Exactly how he did it James. Had a diver outside just hold a metal cover over the outside flange, then unbolted the view port from the inside. Water pressure retained the cover on the outside once the view port was released. It was not a waterproof solution, there was plenty of leakage, however it also was not a flood. It did require fast reflexes and a quick replacement. Had a bolt rolled away or some other little distraction occurred it would have been a much different story. I looked for the video again and couldn't find. It is a video associated with one of the "meets" he had with the submarine community over there.</div><div dir="ltr"><br></div><div dir="ltr">I was wrong about Madsen drilling his view ports. He used an internal retaining ring surrounded by attachment bolts with no circumferential support. See attached photo. </div><div dir="ltr"><br></div><div dir="ltr">Jon</div><div dir="ltr"><br></div><div><br></div>
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On Tuesday, September 29, 2020, 06:10:09 AM EDT, James Frankland via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>> wrote:
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<div><div id="gmail-m_-9031647381300515278ydp22d3cb12yiv2952999339"><div><div dir="ltr">Swapping out a viewport underwater? Does anyone have a link to that? I am assuming he covered the port on the outside as I believe on that boat, the ports came off from inside?<br clear="none"><br clear="none">Would like to see the video if anyone has it?</div><br clear="none"><div><div id="gmail-m_-9031647381300515278ydp22d3cb12yiv2952999339yqt87637"><div dir="ltr">On Mon, 28 Sep 2020 at 17:27, Jon Wallace via Personal_Submersibles <<a shape="rect" href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>> wrote:<br clear="none"></div><blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div style="font-family:"new times",serif;font-size:16px"><div></div>
<div dir="ltr">Attachment holes through viewports are not currently accepted as safe practice even though there are some early model submarines that did utilize that configuration. Sean could likely give a better description but in laymen terms those holes introduce stress and fatigue that could lead to development of cracks within the acrylic material and seriously weaken it. I think the Nekton series used such a configuration but those submarines were certified and therefore went through intense engineering study and testing. Any comment Vance?</div><div dir="ltr"><br clear="none"></div><div dir="ltr">Peter Madsen drilled holes in his view ports to attach them to his submarine UC3, but Peter was also a risk-taker generally and I don't believe he ever dove UC3 to any serious depth. There's a video somewhere of him swapping out a view port underwater.</div><div dir="ltr"><br clear="none"></div><div dir="ltr"><br clear="none"></div><div><br clear="none"></div>
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