<div dir="auto">My understanding from before the fatal incident is that the viewport is a non-standard, novel geometry not described in PVHO. I am unsure exactly what the geometry is, but I believe is curved on the outside but flat on the inside. New geometries can be used under PVHO if multiple copies are destructively tested.<div dir="auto"><br></div><div dir="auto">My office is involved with the formal accident investigation, so I'm being deliberate with what I say. But from the evidence I have seen, I do not believe the viewport was the cause of the accident.<br><br><div data-smartmail="gmail_signature" dir="auto">River J Dolfi<br><a href="mailto:Rdolfi7@gmail.com">Rdolfi7@gmail.com</a> <br>412-997-2526</div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Jun 30, 2023, 11:06 via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Send Personal_Submersibles mailing list submissions to<br>
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Today's Topics:<br>
<br>
1. Re: Titan submersible missing at Titanic site<br>
(Antoine Delafargue via Personal_Submersibles)<br>
2. Re: Titan submersible missing at Titanic site<br>
(Jon Wallace via Personal_Submersibles)<br>
<br>
<br>
----------------------------------------------------------------------<br>
<br>
Message: 1<br>
Date: Fri, 30 Jun 2023 16:10:39 +0200<br>
From: Antoine Delafargue via Personal_Submersibles<br>
<<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>><br>
To: Personal Submersibles General Discussion<br>
<<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>><br>
Subject: Re: [PSUBS-MAILIST] Titan submersible missing at Titanic site<br>
Message-ID:<br>
<CA+v+SjoTvnBEWC5JODY3PVrZGsYj_do-zGSSav=<a href="mailto:V8ggDC3mcPQ@mail.gmail.com" target="_blank" rel="noreferrer">V8ggDC3mcPQ@mail.gmail.com</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
Hello Carsten,<br>
<br>
for the thickness, I read that the viewport should have been rated for<br>
1300meters depth, so I think that the designer designed for a short term<br>
critical pressure of 5200m/52MPa, and perhaps thought it would be fine<br>
using a 1.3X margin to get to 4000m rather than the 4X margin we can find<br>
in Stachiw book and PVHO rules for low temperatures (to be checked but I<br>
believe it is 4x).<br>
<br>
regards<br>
Antoine<br>
<br>
On Fri, Jun 30, 2023 at 4:03?PM <a href="mailto:MerlinSub@t-online.de" target="_blank" rel="noreferrer">MerlinSub@t-online.de</a> via<br>
Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>> wrote:<br>
<br>
> I check out some pictures and based on a given length of 6500mm<br>
><br>
> I come to the following rough figures:<br>
><br>
><br>
><br>
> Diameter hull 1600 mm<br>
><br>
> Diameter front porthole outside 700 mm<br>
><br>
> Diameter front porthole inside 466 mm<br>
><br>
> (these diameters indicate that the porthole could be original designed as<br>
> entrance..)<br>
><br>
><br>
><br>
><br>
><br>
> Now idear about the thickness of the acrylic<br>
><br>
> - but will check out PHSME about standard flange angles tonight.<br>
><br>
><br>
><br>
> Carsten<br>
><br>
><br>
><br>
><br>
><br>
><br>
><br>
><br>
><br>
> -----Original-Nachricht-----<br>
><br>
> Betreff: Re: [PSUBS-MAILIST] Titan submersible missing at Titanic site<br>
><br>
> Datum: 2023-06-30T15:31:14+0200<br>
><br>
> Von: "<a href="mailto:MerlinSub@t-online.de" target="_blank" rel="noreferrer">MerlinSub@t-online.de</a> via Personal_Submersibles" <<br>
> <a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>><br>
><br>
> An: "Personal Submersibles General Discussion" <<br>
> <a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>><br>
><br>
><br>
><br>
><br>
><br>
><br>
><br>
> For me it looks like the biggest diameter porthole used in that deep.<br>
><br>
><br>
><br>
> Has somebody here inner and outer diameter and the thickness?<br>
><br>
><br>
><br>
> Carsten<br>
><br>
><br>
><br>
><br>
><br>
><br>
><br>
> -----Original-Nachricht-----<br>
><br>
> Betreff: Re: [PSUBS-MAILIST] Titan submersible missing at Titanic site<br>
><br>
> Datum: 2023-06-29T21:11:55+0200<br>
><br>
> Von: "Jon Wallace via Personal_Submersibles" <<br>
> <a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>><br>
><br>
> An: "Personal Submersibles General Discussion" <<br>
> <a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>><br>
><br>
><br>
><br>
><br>
><br>
><br>
><br>
> The pictures of Titan that I see in water show 16 bolts holding the<br>
> retaining ring in place. See attached photo.<br>
><br>
><br>
> Jon<br>
><br>
><br>
><br>
> On Thursday, June 29, 2023 at 11:49:18 AM EDT, <a href="mailto:MerlinSub@t-online.de" target="_blank" rel="noreferrer">MerlinSub@t-online.de</a> via<br>
> Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>> wrote:<br>
><br>
><br>
><br>
> I have seen a video how they make the carbon cylinder and can imagine that<br>
> the boat imploded in longitudinal direction.<br>
><br>
> Create a massive shock wave with push the window out (not in). As I saw in<br>
> another video the window was hold by only 4 bolts outside.<br>
><br>
><br>
><br>
> All titan parts in the video seems undamaged.<br>
><br>
><br>
><br>
> Carsten<br>
><br>
><br>
><br>
><br>
><br>
><br>
><br>
><br>
> ?<br>
> _______________________________________________<br>
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Message: 2<br>
Date: Fri, 30 Jun 2023 15:05:23 +0000 (UTC)<br>
From: Jon Wallace via Personal_Submersibles<br>
<<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>><br>
To: Personal Submersibles General Discussion<br>
<<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>><br>
Subject: Re: [PSUBS-MAILIST] Titan submersible missing at Titanic site<br>
Message-ID: <<a href="mailto:1457183317.886229.1688137523386@mail.yahoo.com" target="_blank" rel="noreferrer">1457183317.886229.1688137523386@mail.yahoo.com</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
According to an article I found the viewport diameter was 53cm which I believe was the outside dimension.? Based upon a video I found with Rush putting his hand up to the inside viewport I would estimate the inside diameter closer to 300mm.? The seat appears conical however the viewport had a convex outside surface.? Hard to say if that means it was just a regular spherical segment with conical seats or a conical viewport with a convex exterior surface.<br>
<a href="https://www.insider.com/titan-missing-submersible-photos-interior-exterior-dock-launch-2023-6#the-titans-viewport-measured-21-inches-according-to-oceangate-thats-the-biggest-viewport-of-any-deep-diving-submersible-6" rel="noreferrer noreferrer" target="_blank">https://www.insider.com/titan-missing-submersible-photos-interior-exterior-dock-launch-2023-6#the-titans-viewport-measured-21-inches-according-to-oceangate-thats-the-biggest-viewport-of-any-deep-diving-submersible-6</a><br>
<br>
<a href="https://www.youtube.com/watch?v=ClkytJa0ghc" rel="noreferrer noreferrer" target="_blank">https://www.youtube.com/watch?v=ClkytJa0ghc</a>? (See 0:13 to 0:29)<br>
<br>
<br>
Jon<br>
<br>
<br>
On Friday, June 30, 2023 at 10:07:33 AM EDT, <a href="mailto:MerlinSub@t-online.de" target="_blank" rel="noreferrer">MerlinSub@t-online.de</a> via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>> wrote: <br>
<br>
<br>
I check out some pictures and based on a given length of 6500mm <br>
<br>
I come to the following rough figures:?<br>
<br>
?<br>
<br>
Diameter hull? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?1600 mm<br>
<br>
Diameter front porthole outside? ? ? ? ?700 mm<br>
<br>
Diameter front porthole inside? ? ? ? ? ? 466 mm?<br>
<br>
(these diameters indicate that the porthole could be original designed as entrance..)<br>
<br>
?<br>
<br>
?<br>
<br>
Now idear about the thickness of the acrylic <br>
<br>
- but will check out PHSME about standard flange angles tonight.?<br>
<br>
?<br>
<br>
Carsten<br>
<br>
?<br>
<br>
?<br>
<br>
?<br>
<br>
?<br>
<br>
-----Original-Nachricht-----<br>
<br>
Betreff: Re: [PSUBS-MAILIST] Titan submersible missing at Titanic site<br>
<br>
Datum: 2023-06-30T15:31:14+0200<br>
<br>
Von: "<a href="mailto:MerlinSub@t-online.de" target="_blank" rel="noreferrer">MerlinSub@t-online.de</a> via Personal_Submersibles" <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>><br>
<br>
An: "Personal Submersibles General Discussion" <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>><br>
<br>
?<br>
<br>
?<br>
<br>
?<br>
<br>
For me it looks like the biggest diameter porthole used in that deep.?<br>
<br>
?<br>
<br>
Has somebody here inner and outer diameter and the thickness?<br>
<br>
?<br>
<br>
Carsten<br>
<br>
?<br>
<br>
?<br>
<br>
?<br>
<br>
-----Original-Nachricht-----<br>
<br>
Betreff: Re: [PSUBS-MAILIST] Titan submersible missing at Titanic site<br>
<br>
Datum: 2023-06-29T21:11:55+0200<br>
<br>
Von: "Jon Wallace via Personal_Submersibles" <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>><br>
<br>
An: "Personal Submersibles General Discussion" <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>><br>
<br>
?<br>
<br>
?<br>
<br>
?<br>
?The pictures of Titan that I see in water show 16 bolts holding the retaining ring in place.? See attached photo.??Jon???On Thursday, June 29, 2023 at 11:49:18 AM EDT, <a href="mailto:MerlinSub@t-online.de" target="_blank" rel="noreferrer">MerlinSub@t-online.de</a> via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>> wrote:??<br>
I have seen a video how they make the carbon cylinder and can imagine that the boat imploded in longitudinal direction.?<br>
<br>
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.?<br>
<br>
?<br>
<br>
All titan parts in the video seems undamaged.?<br>
<br>
?<br>
<br>
Carsten<br>
<br>
?<br>
<br>
?<br>
<br>
?<br>
<br>
?<br>
?_______________________________________________<br>
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</blockquote></div>