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Titanic Tourist Submarine Goes Missing

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Was reading on another (more intelligent) forum yesterday about the stress properties of carbon fibre; apparently loading carbon fibre under compression doesn't utilise it's real strengths and it's when loaded under tension that it's optimum. Basically it's better use in the sky / space than it is underwater.

Makes sense given we sort of half know the outcome now.
 
Was reading on another (more intelligent) forum yesterday about the stress properties of carbon fibre; apparently loading carbon fibre under compression doesn't utilise it's real strengths and it's when loaded under tension that it's optimum. Basically it's better use in the sky / space than it is underwater.

Makes sense given we sort of half know the outcome now.

Yeah, CF is great in lateral compression, but crap in vertical compression. IE, it's great for things that need to twist and stay rigid, not great for things that have to get crushed. It's main material properties are how easy it is to shape how you want it and it's lightweight. I'm not sure how advantageous either of those things are for a cylinder that's desinged to sink.

EDIT: There's probably a reason no navy in the world is making manned submersibles in carbon fibre.
 

Was reading on another (more intelligent) forum yesterday about the stress properties of carbon fibre; apparently loading carbon fibre under compression doesn't utilise it's real strengths and it's when loaded under tension that it's optimum. Basically it's better use in the sky / space than it is underwater.

Makes sense given we sort of half know the outcome now.
firstly, give us hell!
second, I'm guessing the carbon fibre being massively lighter that say a two inch thick steel hull means, and here it comes, the propulsion is moving less bulk, so done on the cheap. This thing appears cobbled together, and no wonder there's been such an effort to find them, the owner being part of the lost means it'll be to the lawyers to get everyone's pay for the month.
 
firstly, give us hell!
second, I'm guessing the carbon fibre being massively lighter that say a two inch thick steel hull means, and here it comes, the propulsion is moving less bulk, so done on the cheap. This thing appears cobbled together, and no wonder there's been such an effort to find them, the owner being part of the lost means it'll be to the lawyers to get everyone's pay for the month.
I think the CF cylinder section of the vessel was there to increase the space inside the cabin available to paying customers. Herard a report just now mentioning that traditional designs for this kind of craft were of a two man design, with just two titanium hemispheres either fastened or welded together so that the pressure is uniformly distributed to force them together. This design allows an extra three fares on board. Still profits before safety ultimately.
 

I think the CF cylinder section of the vessel was there to increase the space inside the cabin available to paying customers. Herard a report just now mentioning that traditional designs for this kind of craft were of a two man design, with just two titanium hemispheres either fastened or welded together so that the pressure is uniformly distributed to force them together. This design allows an extra three fares on board. Still profits before safety ultimately.
That's right, and I wonder if the quarter million ticket price was calculated based on the usual tourist economy principles. Or was it just that the craft so happens to fit Captain Nobhead Nemo and FOUR paying customers?

A million dollars a dive? Yeah sounds about right.
 
So this story got me reading into all sorts of stuff about deep sea diving... Pressure (water or air) is a weird thing.

Google "the byford dolphin incident" - spoiler, it has nothing to do with dolphins.

Crikey, that "medical findings" section on the wikipedia page for this topic is gruesome and tough to wrap your head around.

[Edit: I've just chased up the original forensic article documenting the diver's conditions following this accident. Tough to look at the photos and read the description]
 
I just don’t understand why it wasn’t tethered to the surface vessel, so I’ve read. Crazy.
4k tether costs money and weight, it also has to be fixed to something solid and need to be able to resist turbulence of the ocean, then a big enough winch on the boat to lift 11 ton + cable weight, in potential bad seas/weather. Seems it was a lifeline ruled out for inconvenience and cash reasons.
 

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