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It's a good thing that they had dissolvable weight releases but I'm still amazed at the lack of backup systems and still letting passengers onboard. Related to

It's a good thing that they had dissolvable weight releases but I'm still amazed at the lack of backup systems and still letting passengers onboard. Related to this, the Hydraulic Press channel did a somewhat similar implosion test of a composite tube with metallic ends. Thought it was relevant due to other discussion on this topic: https://www.youtube.com/watch?v=BQGDwE3yMb0 https://www.youtube.com/watch?v=BQGDwE3yMb0

jacquesm 3y ago
'Water was able to get inside, which is suboptimal for submarine...'
lesuorac 3y ago
That video is really just for entertainment purposes. As a lot of the comments talk about, it visually looks [1] like the glue failed and there's no provided evidence that a submersible would use the same 2 part epoxy glue. [1]: https://youtu.be/BQGDwE3yMb0?t=317 https://youtu.be/BQGDwE3yMb0?t=317
- mechhacker 3y ago
  If the bond failed before the tube, then it would probably just leak like they did earlier in the video. The high velocity/high deformation collapse inward would probably cause any bond line or the fibers in that proximity to fail anyway?
  - lesuorac 3y ago
    > If the bond failed before the tube, then it would probably just leak like they did earlier in the video. My understanding was for that "submersible" the glue never had a seal in the first place. But I can see the argument that instead the glue failed early on. > The high velocity/high deformation collapse inward would probably cause any bond line or the fibers in that proximity to fail anyway? Well, my overall point is that there is no evidence that the test is an accurate reproduction/simulation of Titan. Honestly a better test is probably just having carbon fiber on "dry-land" and pushing on sheet of it using the press at a known pressure so see if at 400 atms it just deforms or breaks. The whole point of it being a submersible test is to ride the curtails of the deaths (i.e. entertainment not education). Anyways, the carbon fiber definitely deforms but the glue failing is a very fast shock that precedes the implosion. Surely the carbon fiber would've broke when more force was applied (assuming the glue didn't). But I think the test only showed the breaking point of the epoxy. If you're testing submerssibles and one of them has (>5% maybe less) deformation that should count as a test failure. But that deformation doesn't count as an implosion.
heavenlyblue 3y ago
What is the result of their test? Their accent and lack of detail makes it a bit of a pain to understand. I expect something like "we did 20 dives at half capacity and then it imploded at 75% capacity"
jmount 3y ago
They say they had dissolvable weight releases. It seems that is another place one would cut costs by lying, as a real such system would require a lot of swap-outs.
renewiltord 3y ago
It's actually pretty wild that people make money making these videos. It's incredible what cheap mass access can make possible. YouTube is a masterpiece: the engineering, the BD, the partner management and monetization. Absolutely genius invention.

jacquesm 3y ago

'Water was able to get inside, which is suboptimal for submarine...'

lesuorac 3y ago

That video is really just for entertainment purposes. As a lot of the comments talk about, it visually looks [1] like the glue failed and there's no provided evidence that a submersible would use the same 2 part epoxy glue. [1]: https://youtu.be/BQGDwE3yMb0?t=317 https://youtu.be/BQGDwE3yMb0?t=317

mechhacker 3y ago
If the bond failed before the tube, then it would probably just leak like they did earlier in the video. The high velocity/high deformation collapse inward would probably cause any bond line or the fibers in that proximity to fail anyway?
- lesuorac 3y ago
  > If the bond failed before the tube, then it would probably just leak like they did earlier in the video. My understanding was for that "submersible" the glue never had a seal in the first place. But I can see the argument that instead the glue failed early on. > The high velocity/high deformation collapse inward would probably cause any bond line or the fibers in that proximity to fail anyway? Well, my overall point is that there is no evidence that the test is an accurate reproduction/simulation of Titan. Honestly a better test is probably just having carbon fiber on "dry-land" and pushing on sheet of it using the press at a known pressure so see if at 400 atms it just deforms or breaks. The whole point of it being a submersible test is to ride the curtails of the deaths (i.e. entertainment not education). Anyways, the carbon fiber definitely deforms but the glue failing is a very fast shock that precedes the implosion. Surely the carbon fiber would've broke when more force was applied (assuming the glue didn't). But I think the test only showed the breaking point of the epoxy. If you're testing submerssibles and one of them has (>5% maybe less) deformation that should count as a test failure. But that deformation doesn't count as an implosion.

heavenlyblue 3y ago

What is the result of their test? Their accent and lack of detail makes it a bit of a pain to understand. I expect something like "we did 20 dives at half capacity and then it imploded at 75% capacity"

jmount 3y ago

They say they had dissolvable weight releases. It seems that is another place one would cut costs by lying, as a real such system would require a lot of swap-outs.

renewiltord 3y ago

It's actually pretty wild that people make money making these videos. It's incredible what cheap mass access can make possible. YouTube is a masterpiece: the engineering, the BD, the partner management and monetization. Absolutely genius invention.