<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/><title></title></head><body><p style="margin: 0px;"><span style="font-family:arial,helvetica,sans-serif;font-size:10pt;color:#000000;text-decoration:none">If I use these 120 mm (STCP) and a CF of 4 it was good for around 1000 m. </span></p>
<p style="margin: 0px;">With 120 mm thickness it was at collapse deep. </p>
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<p style="margin: 0px;">Carsten</p>
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<p style="margin: 0px;">Betreff: Re: [PSUBS-MAILIST] Titan submersible missing at Titanic site</p>
<p style="margin: 0px;">Datum: 2023-06-30T22:18:31+0200</p>
<p style="margin: 0px;">Von: "MerlinSub@t-online.de via Personal_Submersibles" <personal_submersibles@psubs.org></p>
<p style="margin: 0px;">An: "Personal Submersibles General Discussion" <personal_submersibles@psubs.org></p>
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<p style="margin: 0px;"><span style="font-family: arial,helvetica,sans-serif; font-size: 10pt; color: #000000; text-decoration: none;">I found a much better picture and correct the figures as follow:</span></p>
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<p style="margin: 0px;">Diameter hull 1600 mm (given) </p>
<p style="margin: 0px;">Diameter front porthole outside 614 mm</p>
<p style="margin: 0px;">Diameter front porthole inside 436 mm </p>
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<p style="margin: 0px;">But given with the outer window diamter given by Jon of just 530 I come to </p>
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<p style="margin: 0px;">Diameter hull 1381mm</p>
<p style="margin: 0px;">Diameter front porthole outside 530 mm (given)</p>
<p style="margin: 0px;">Diameter front porthole inside 376 mm </p>
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<p style="margin: 0px;">If I do with the 530 / 376 a little reverse enginering on a conical seat of 60°</p>
<p style="margin: 0px;">I come to a thickness of just 120 mm for a inside and outside flat conical frustrum window. </p>
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<p style="margin: 0px;">According to PVHO-1-1987 t /Di = 0,348 with t = 0,348 x 376 mm = 162 mm at 40 Mpa (4000m)</p>
<p style="margin: 0px;">(for Short term critical presssure) </p>
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<p style="margin: 0px;">But from Jon's picture it seems more a Sperical Sector Window with Conical Edge. and flat inside. </p>
<p style="margin: 0px;">The code has no figures for such a window. </p>
<p style="margin: 0px;">But if I use for Sherical Shell windows t/di shall 0,195 means t = 0,195 x 376 = 73 mm</p>
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<p style="margin: 0px;">To be diplomatic I just mix up the flat with the sperhical and got (162 + 73) / 2 = 117,5 mm </p>
<p style="margin: 0px;">(for Short term critical presssure) </p>
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<p style="margin: 0px;">The code says if you have not a standard geometrie - you have to test 5 windows to destroy dephs </p>
<p style="margin: 0px;">and use the lowest failture pressure for your calculation. </p>
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<p style="margin: 0px;">Carsten</p>
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<p style="margin: 0px;"><span style="font-family: arial,helvetica,sans-serif; font-size: 10pt; color: #000000; text-decoration: none;">. </span></p>
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<p style="margin: 0px;">-----Original-Nachricht-----</p>
<p style="margin: 0px;">Betreff: Re: [PSUBS-MAILIST] Titan submersible missing at Titanic site</p>
<p style="margin: 0px;">Datum: 2023-06-30T16:11:40+0200</p>
<p style="margin: 0px;">Von: "Antoine Delafargue via Personal_Submersibles" <personal_submersibles@psubs.org></p>
<p style="margin: 0px;">An: "Personal Submersibles General Discussion" <personal_submersibles@psubs.org></p>
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<div dir="ltr">Hello Carsten,
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<div>for the thickness, I read that the viewport should have been rated for 1300meters depth, so I think that the designer designed for a short term critical pressure of 5200m/52MPa, and perhaps thought it would be fine using a 1.3X margin to get to 4000m rather than the 4X margin we can find in Stachiw book and PVHO rules for low temperatures (to be checked but I believe it is 4x). </div>
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<div>regards</div>
<div>Antoine</div>
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<div class="gmail_attr" dir="ltr">On Fri, Jun 30, 2023 at 4:03 PM <a href="mailto:MerlinSub@t-online.de">MerlinSub@t-online.de</a> via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:</div>
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<p style="margin: 0px;"><span style="font-family: arial,helvetica,sans-serif; font-size: 10pt; color: #000000; text-decoration: none;">I check out some pictures and based on a given length of 6500mm </span></p>
<p style="margin: 0px;"><span style="font-family: arial,helvetica,sans-serif; font-size: 10pt; color: #000000; text-decoration: none;">I come to the following rough figures: </span></p>
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<p style="margin: 0px;"><span style="font-family: arial,helvetica,sans-serif; font-size: 10pt; color: #000000; text-decoration: none;">Diameter hull 1600 mm</span></p>
<p style="margin: 0px;"><span style="font-family: arial,helvetica,sans-serif; font-size: 10pt; color: #000000; text-decoration: none;">Diameter front porthole outside 700 mm</span></p>
<p style="margin: 0px;"><span style="font-family: arial,helvetica,sans-serif; font-size: 10pt; color: #000000; text-decoration: none;">Diameter front porthole inside 466 mm </span></p>
<p style="margin: 0px;"><span style="font-family: arial,helvetica,sans-serif; font-size: 10pt; color: #000000; text-decoration: none;">(these diameters indicate that the porthole could be original designed as entrance..)</span></p>
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<p style="margin: 0px;"><span style="font-family: arial,helvetica,sans-serif; font-size: 10pt; color: #000000; text-decoration: none;">Now idear about the thickness of the acrylic </span></p>
<p style="margin: 0px;"><span style="font-family: arial,helvetica,sans-serif; font-size: 10pt; color: #000000; text-decoration: none;">- but will check out PHSME about standard flange angles tonight. </span></p>
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<p style="margin: 0px;"><span style="font-family: arial,helvetica,sans-serif; font-size: 10pt; color: #000000; text-decoration: none;">Carsten</span></p>
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<p style="margin: 0px;">-----Original-Nachricht-----</p>
<p style="margin: 0px;">Betreff: Re: [PSUBS-MAILIST] Titan submersible missing at Titanic site</p>
<p style="margin: 0px;">Datum: 2023-06-30T15:31:14+0200</p>
<p style="margin: 0px;">Von: "<a href="mailto:MerlinSub@t-online.de">MerlinSub@t-online.de</a> via Personal_Submersibles" <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>></p>
<p style="margin: 0px;">An: "Personal Submersibles General Discussion" <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>></p>
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<p style="margin: 0px;"><span style="font-family: arial,helvetica,sans-serif; font-size: 10pt; color: #000000; text-decoration: none;">For me it looks like the biggest diameter porthole used in that deep. </span></p>
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<p style="margin: 0px;"><span style="font-family: arial,helvetica,sans-serif; font-size: 10pt; color: #000000; text-decoration: none;">Has somebody here inner and outer diameter and the thickness?</span></p>
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<p style="margin: 0px;"><span style="font-family: arial,helvetica,sans-serif; font-size: 10pt; color: #000000; text-decoration: none;">Carsten</span></p>
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<p style="margin: 0px;">-----Original-Nachricht-----</p>
<p style="margin: 0px;">Betreff: Re: [PSUBS-MAILIST] Titan submersible missing at Titanic site</p>
<p style="margin: 0px;">Datum: 2023-06-29T21:11:55+0200</p>
<p style="margin: 0px;">Von: "Jon Wallace via Personal_Submersibles" <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>></p>
<p style="margin: 0px;">An: "Personal Submersibles General Discussion" <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>></p>
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<div dir="ltr">The pictures of Titan that I see in water show 16 bolts holding the retaining ring in place. See attached photo.</div>
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<div dir="ltr">Jon</div>
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<div>On Thursday, June 29, 2023 at 11:49:18 AM EDT, <a href="mailto:MerlinSub@t-online.de">MerlinSub@t-online.de</a> via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:</div>
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<p style="margin: 0px;"><span style="font-family: arial,helvetica,sans-serif; font-size: 10pt; color: #000000; text-decoration: none;">I have seen a video how they make the carbon cylinder and can imagine that the boat imploded in longitudinal direction. </span></p>
<p style="margin: 0px;"><span style="font-family: arial,helvetica,sans-serif; font-size: 10pt; color: #000000; text-decoration: none;">Create a massive shock wave with push the window out (not in). As I saw in another video the window was hold by only 4 bolts outside. </span></p>
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<p style="margin: 0px;"><span style="font-family: arial,helvetica,sans-serif; font-size: 10pt; color: #000000; text-decoration: none;">All titan parts in the video seems undamaged. </span></p>
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<p style="margin: 0px;"><span style="font-family: arial,helvetica,sans-serif; font-size: 10pt; color: #000000; text-decoration: none;">Carsten</span></p>
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