Comments by "" (@GWNorth-db8vn) on "OceanGate Titan Hull - Hundreds of Ill-advised Carbon Fiber Grind Spots" video.

Repeating trigger words doesn't count as thinking.
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More unknown material properties from using unknown techniques on an untested design. They might as well have tried that.
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"You don't get torsional moments underwater". On paper, where everything is geometrically perfect and never changes and the environment doesn't exist. Just like designing a bridge without giving any thought to wind, rust, or metal fatigue.
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Bumps weaken the structure, too. It's a surface at an angle to radial and wants to push sideways and cave in. That's one of those torsional moments Rush said you don't get underwater. Bumps and ridges like it had make the whole cylinder want to twist and give it a head start toward collapsing like a squashed beer can.
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They make expensive motorcycle mufflers with carbon fiber cans.
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@ - Sub hulls go down to a small fraction of the depth a submersible does, and they have internal frames. No sub can reach the depth of Titanic.
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@ - A cylinder provides more internal volume than a sphere. Submarines have a completely purpose and needs than a submersible. Subs are expensive because of all the things that go inside them. The hull is just steel. That's the cheap part.
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@alexpyattaev - Spheres provide that volume in a shape that provides less useful room for humans and machinery. Cylinders can be made longer without having to make them also higher. Subs are more like 20 mm thick, and they're generally made of Y80 steel or an equivalent. The steel's fairly cheap. It's used for a lot of other applications. It's the machines that roll and form it that cost a fortune to own and operate. Massive equipment used for tiny volume production.
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@alexpyattaev - Numbers are rare, but 3/4 inch of Y80 is rumored to be standard for american hulls. They only go down to a thousand feet or so, about 400 psi external pressure.
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