By FAR the best take on the fatal Titan sub fiasco.
[Yes, fatal.]
Skip the rest, this is the best, by an actual subject matter expert.
https://www.youtube.com/watch?v=4dka29FSZac
Be careful mentioning how risky this was.
I’ve already dealt with a troll, LOL.
Thanks for the link. Just finished watching this video which gives some experienced commensense observations. Worth the 21 minutes.
Thanks for that video, it was well done.
Being a bubblehead myself, I couldn’t hardly believe all the ridiculous things I was seeing that they were lacking regarding operation and safety equipment of Mr. Rush’s vessel.
It truly was extremely risky.
He disregarded so many safety concerns...didn’t want the inconvenience it seems and paid the ultimate price.
I watched it earlier and the guy is a top-notch briefer, no ahs, uhs, or wasted words it is all solid information well delivered.
Thank You Sir.
That is a good video so far, he just gets straight down to it. Interesting that the waiver basically says YOU COULD DIE (in this experimental craft) !!!
I watched it, I must agree the video gives a complete explanation of what could have gone wrong, and that list is quite lengthy.
In particular what stands out is the CEO did not want to hire experienced career submarine mariners because he did not want a bunch of 50 year old white men on his staff. He preferred to hire inexperienced college grads.
And it sounds like the CEO wanted to cut corners on a number of safety issues such as air quality and the known loss of communications issues.
So what could possibly go wrong with a bunch of college kids reinventing the submarine and ignoring all of the standard safety protocols? I’d say there’s a touch of wokeness going on there.
“By FAR the best take on the fatal Titan sub fiasco.
[Yes, fatal.]
Skip the rest, this is the best, by an actual subject matter expert.
https://www.youtube.com/watch?v=4dka29FSZac
Posting HTML”
Agreed, an SME, Thanks for posting!
Love the comment under it that says something to this effect: “This world is screwed up because it’s run by people like the CEO of that company.”
Good thing the CEO didn’t want any “50 year old white guys” around.
The wireless game controller... lol wtf?
The CEO sounds like the type of personality who eagerly heads to the polls in order to vote reality away. Power to the people! A "Can Do!" attitude that is fake and dangerous because it is not built upon respect for the fundamental workings of natural law, or even the good sense God gave a turnip. In de Nile.
It's one unseemly story for what's coming to light about this whole "Gate" enterprise.
Phinneous, you might find this interesting, along with the general remarks that keep popping up out there -- words like cylinder (galil) and coffin (aron). The main attention-grabbing detail in this saga is that it's a carbon composite hull instead of a heavy metal [cylinder, coffin].
...these things are
16:56
not made out of magic and everybody
16:58
that's worked with carbon fiber in the
16:59
past knows that it does not crack it
17:02
shatters like a porcelain plate so
17:05
whenever it does fail it fails quickly
17:07
and unexpectedly...
Pride in 1912.
Pride in 2023.
Nothing new under the sun. Well, except for carbon fiber, one would suppose.
@MaschinenMusik
What I really don't like about the design:
- I assume the Carbon Fibre pressure hull was fabricated by winding monofilament around a cylindrical core (seen in the video), then it gets wrapped in a vacuum bag, and then put in an autoclave. It's a good technique, but you still can have micro cracks and channels as a result that can be a starting point to fatigue cracking.
- Combination of Carbon Fibre ["CFK"] and Titanium: You have a huge mismatch of the coefficient of thermal expansion of a factor 5 to 6 (CFK 50-60 x 10^-6/K vs 10 x 10^-6/K for Titanium). So when that thing cools down, the Titanium will shrink much more than the Carbon Fibre hull, putting a lot of strain on the glued join. Thermal cycling -> fatigue cracking.
- There is a mismatch in elastic modulus of Carbon Fibre and Titanium which will lead to a mismatch in elastic deformation when exposed to high pressure (only 1 atm in planes, 450 atm at Titanic level) -> again fatigue issues at the joints.
One can mitigate some of that by proper engineering, but combinations of fibre reinforced plastic and metal are tricky especially when cycled through pressure and temperature gradients.
- - -
@kevinthomas5364
Good points on the coefficient of expansion of various materials and accompanying fatigue failure - basic elements of engineering design for components subject to these conditions.
The glue too becomes a big piece of this puzzle as it is part of the seal keeping the pressure out. Typically, dried glue tends to be more on the brittle scale with little plastic deformation upon failure.
It appears that the joint design encapsulated the Titanium over the carbon fiber hull on both sides. This would put tremendous pressure upon decent on the Titanium joint squeezing the carbon it is glued too.
The thermal and pressure stresses would be additive too as both would tend to squeeze the Titanium upon descent and move outward during ascents. This is a perfect storm forcumulative
["Filament wound carbon parts have outstanding characteristics, such as high stiffness and low weight. Not only can they be designed to be temperature stable, they can also be adapted to a wide range of CTEs - Coefficients of Thermal Expansion." Source: CarboSpaceTech (CST) - located on Lake Constance in southern Germany]