[PSUBS-MAILIST] Titan submersible missing at Titanic site

Fri Jun 30 13:24:58 EDT 2023

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.

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.

River J Dolfi
Rdolfi7 at gmail.com
412-997-2526

On Fri, Jun 30, 2023, 11:06 via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Send Personal_Submersibles mailing list submissions to
>         personal_submersibles at psubs.org
>
> To subscribe or unsubscribe via the World Wide Web, visit
>         http://www.whoweb.com/mailman/listinfo.cgi/personal_submersibles
> or, via email, send a message with subject or body 'help' to
>         personal_submersibles-request at psubs.org
>
> You can reach the person managing the list at
>         personal_submersibles-owner at psubs.org
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Personal_Submersibles digest..."
>
>
> Today's Topics:
>
>    1. Re: Titan submersible missing at Titanic site
>       (Antoine Delafargue via Personal_Submersibles)
>    2. Re: Titan submersible missing at Titanic site
>       (Jon Wallace via Personal_Submersibles)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 30 Jun 2023 16:10:39 +0200
> From: Antoine Delafargue via Personal_Submersibles
>         <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion
>         <personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] Titan submersible missing at Titanic site
> Message-ID:
>         <CA+v+SjoTvnBEWC5JODY3PVrZGsYj_do-zGSSav=
> V8ggDC3mcPQ at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Hello Carsten,
>
> 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).
>
> regards
> Antoine
>
> On Fri, Jun 30, 2023 at 4:03?PM MerlinSub at t-online.de via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
> > I check out some pictures and based on a given length of 6500mm
> >
> > I come to the following rough figures:
> >
> >
> >
> > Diameter hull                                   1600 mm
> >
> > Diameter front porthole outside         700 mm
> >
> > Diameter front porthole inside            466 mm
> >
> > (these diameters indicate that the porthole could be original designed as
> > entrance..)
> >
> >
> >
> >
> >
> > Now idear about the thickness of the acrylic
> >
> > - but will check out PHSME about standard flange angles tonight.
> >
> >
> >
> > Carsten
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > -----Original-Nachricht-----
> >
> > Betreff: Re: [PSUBS-MAILIST] Titan submersible missing at Titanic site
> >
> > Datum: 2023-06-30T15:31:14+0200
> >
> > Von: "MerlinSub at t-online.de via Personal_Submersibles" <
> > personal_submersibles at psubs.org>
> >
> > An: "Personal Submersibles General Discussion" <
> > personal_submersibles at psubs.org>
> >
> >
> >
> >
> >
> >
> >
> > For me it looks like the biggest diameter porthole used in that deep.
> >
> >
> >
> > Has somebody here inner and outer diameter and the thickness?
> >
> >
> >
> > Carsten
> >
> >
> >
> >
> >
> >
> >
> > -----Original-Nachricht-----
> >
> > Betreff: Re: [PSUBS-MAILIST] Titan submersible missing at Titanic site
> >
> > Datum: 2023-06-29T21:11:55+0200
> >
> > Von: "Jon Wallace via Personal_Submersibles" <
> > personal_submersibles at psubs.org>
> >
> > An: "Personal Submersibles General Discussion" <
> > personal_submersibles at psubs.org>
> >
> >
> >
> >
> >
> >
> >
> > 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, MerlinSub at t-online.de via
> > Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> >
> >
> >
> > I have seen a video how they make the carbon cylinder and can imagine
> that
> > the boat imploded in longitudinal direction.
> >
> > 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.
> >
> >
> >
> > All titan parts in the video seems undamaged.
> >
> >
> >
> > Carsten
> >
> >
> >
> >
> >
> >
> >
> >
> > ?
> > _______________________________________________
> > Personal_Submersibles mailing list
> > Personal_Submersibles at psubs.org
> > http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
> >
> -------------- next part --------------
> An HTML attachment was scrubbed...
> URL: <
> http://www.whoweb.com/pipermail/personal_submersibles/attachments/20230630/ba5ca770/attachment-0001.html
> >
>
> ------------------------------
>
> Message: 2
> Date: Fri, 30 Jun 2023 15:05:23 +0000 (UTC)
> From: Jon Wallace via Personal_Submersibles
>         <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion
>         <personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] Titan submersible missing at Titanic site
> Message-ID: <1457183317.886229.1688137523386 at mail.yahoo.com>
> Content-Type: text/plain; charset="utf-8"
>
>  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.
>
> 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
>
> https://www.youtube.com/watch?v=ClkytJa0ghc? (See 0:13 to 0:29)
>
>
> Jon
>
>
>     On Friday, June 30, 2023 at 10:07:33 AM EDT, MerlinSub at t-online.de
> via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> I check out some pictures and based on a given length of 6500mm
>
> I come to the following rough figures:?
>
> ?
>
> Diameter hull? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?1600 mm
>
> Diameter front porthole outside? ? ? ? ?700 mm
>
> Diameter front porthole inside? ? ? ? ? ? 466 mm?
>
> (these diameters indicate that the porthole could be original designed as
> entrance..)
>
> ?
>
> ?
>
> Now idear about the thickness of the acrylic
>
> - but will check out PHSME about standard flange angles tonight.?
>
> ?
>
> Carsten
>
> ?
>
> ?
>
> ?
>
> ?
>
> -----Original-Nachricht-----
>
> Betreff: Re: [PSUBS-MAILIST] Titan submersible missing at Titanic site
>
> Datum: 2023-06-30T15:31:14+0200
>
> Von: "MerlinSub at t-online.de via Personal_Submersibles" <
> personal_submersibles at psubs.org>
>
> An: "Personal Submersibles General Discussion" <
> personal_submersibles at psubs.org>
>
> ?
>
> ?
>
> ?
>
> For me it looks like the biggest diameter porthole used in that deep.?
>
> ?
>
> Has somebody here inner and outer diameter and the thickness?
>
> ?
>
> Carsten
>
> ?
>
> ?
>
> ?
>
> -----Original-Nachricht-----
>
> Betreff: Re: [PSUBS-MAILIST] Titan submersible missing at Titanic site
>
> Datum: 2023-06-29T21:11:55+0200
>
> Von: "Jon Wallace via Personal_Submersibles" <
> personal_submersibles at psubs.org>
>
> An: "Personal Submersibles General Discussion" <
> personal_submersibles at psubs.org>
>
> ?
>
> ?
>
> ?
> ?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, MerlinSub at t-online.de via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:??
> I have seen a video how they make the carbon cylinder and can imagine that
> the boat imploded in longitudinal direction.?
>
> 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.?
>
> ?
>
> All titan parts in the video seems undamaged.?
>
> ?
>
> Carsten
>
> ?
>
> ?
>
> ?
>
> ?
> ?_______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
> -------------- next part --------------
> An HTML attachment was scrubbed...
> URL: <
> http://www.whoweb.com/pipermail/personal_submersibles/attachments/20230630/6488de8d/attachment.html
> >
>
> ------------------------------
>
> Subject: Digest Footer
>
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.whoweb.com/mailman/listinfo.cgi/personal_submersibles
>
>
> ------------------------------
>
> End of Personal_Submersibles Digest, Vol 118, Issue 61
> ******************************************************
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20230630/d9f8ec6f/attachment-0001.html>