titanic tourist sub

More video.

Watch: Additional chilling footage of Titan submersible wreckage revealed as hearing continues https://www.foxweather.com/weather-news/video-oceangate-titanic-submersible-implosion-debris-hearing-thursday

 

Pretty interesting. Apparently on one dive the sub was bashed against its surface platform for an hour. It was also towed through a fishing net at night.

I wonder how many bashes it can take and still dive to those depths..

 

One of the final comments of the day they ask a witness if S. Rush had discussed how many cycles the sub could do and Rush told him indefinite which I took as no limit.

 

One analysis...

 

One of the criticisms here was not maintaining even glue margins on the rings. Even in woodshop, we learn overclamping can result in adhesive starvation and a weak bond. Unless they had a taper in the machining; the work looked really odd, hand smearing resins and then sliding the rings over the edge and saying we only get one try to get it right.

crickeys

 

Apparently more info is being released. No Final report yet.

https://media.defense.gov/2024/Sep/...NTSB TITAN MATERIAL ANALYSIS.PDF_REDACTED.PDF

or you can watch the whole thing

 

Wow, isn't that interesting.
I'm one hour into the long video.
Staggering.

 

I'll put it into the Playlist for my next layover. Had a chance to watch the Australian 60 minutes interview from James Cameron that dropped yesterday, he very politely didn't pull any punches.

That ntsb video is a long one...

 

One small spoiler.

I’m a little surprised they used peelply between 5 layups and the potential for discontinuity and then they found discontinuity in the post mortem(sorry). If I had discontinuity after a peelply layer, I’d fill it with epoxy putty. Here, it appears they pretended it didn’t matter. Even a boat builder wouldn’t shrug it off.

They pretended a lot didn’t matter.

 

You can skip through loads of it but the engineers report is telling.
10x more voids spaces than allowed in the 5" cylindrical composite wall, adhesion issues, etc, etc, etc.

 

And the builders were not on board. Just the fellow who paid them. And the folks who paid him.

 

More analysis and commentary on the hearings, this time focusing on the hull to dome glue joint.

 

The use of CFC sleeve-hull shape is not understandable to me. If a scuba tank made of CFC makes mechanical sense to me , it does not necessarily have to work with a reverse pressure system. In the case of scuba tank , fibers are stretched, it works as intended, in the case of Titan I do not know how the fibers worked.
I'm surprised they managed to do so many dives .Incredible strenght even if the fibers were not working properly .
Make a deep going CFC submersible is possible but specific properties of composites should be consider in the project .
I've seen these rings how they are glued before, I didn't even see any excess glue leak out. It wasn't done well.I would do it in reverse position , ring at the bottom and glue should be in excess. The clevis themselves were also too thin , IMO.
Welding hanging points were also risky , they could use soft transport belt with ease.