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woodreau

Flexing Container Ship

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Jim Driscoll, MSI Raider GE76 12UHS-607 17.3" Gaming Laptop Computer - Blue Intel Core i9 12th Gen 12900HK 1.8GHz Processor; NVIDIA GeForce RTX 3080 Ti 16GB GDDR6; 64GB DDR5-4800 RAM; Dual M2 2TB Solid State Drives.Driving a Sony KD-50X75, and KDL-48R470B @ 4k 3724x2094,MSFS 2020, 30 FPS on Ultra Settings.

Jorg/Asobo: “Weather is a core part of our simulator, and we will strive to make it as accurate as possible.”Also Jorg/Asobo: “We are going to limit the weather API to rain intensity only.”


 

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They are designed to do that (as scary as that thought might be). If they didn't flex, you would have a real serious problem. I once stood on the transom of a research vessel and looked forward to the wheel house; a distance of about 200 feet. We were operating in the Atlantic about 120 miles east of Cape Cod in a sea state of 4 - 5. We had a quartering sea running (the worst when it comes to longitudinal flexing). I was amazed to see the wheel house flexing in the totally opposite direction as the transom. It was as if a child had put a hand on the bow and a hand on the stern and started twisting. I am not talking about minor flexing... this was distances of feet. The chief engineer spent a considerable amount of time that day trying to convince me that this was normal and that I should wear my survival suit 24x7.The R.V. by the way, was the G.W. Pierce based out of Ft. Lauderdale at the time.

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Guest zzmikezz

Tom,Aren't there expansion joints for dealing with this kind of thing? The ship "working", I mean.

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Think of it much like an airplane wing - the joints, the design, and indeed perhaps the metal itself - all engineered to have a degree of flex in it to absorb the changing dynamics of the environment it's travelling in.The airplane wing is a "solid" form, with no distinguishable expansion joints, but it's construction allows it flexibility. I think the ship is the same way... no designated expansion joints, but engineered to absorb the loads of high seas without snapping in two. -Greg(NOT a mechanical engineer)

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Guest zzmikezz

greggerm,Yours was a good analysis. I'm persuaded by it.

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Greg and Mike,Greg's explanation is spot on. Flexure allows the ship to survive whereas rigidity could make for a very bad morning after. An expansion joint (ala the U2 spy plane) is not a particularly good idea in a hull design for a ship. Today's steel and aluminum designs allow for light weight, but very strong structure that can be put under tremendous at-sea loading and survive. Mike, sorry for not getting an answer back to you sooner, but Greg's response is much better than I could have come up with. :)

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Tom- I've read of crew on an aircraft carrier, sitting on the flight deck and cracking walnut shells with the steady movement of deck expansion joints as the ship ploughed into a heavy ground swell. Any truth to that tale? I suppose one should be cautious with his fingers as the bow reaches the trough of the swell and starts to lift once more!Alex Reid

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On the old Lexington class(FDR)carrier I was on,Rain water used to pour threw the expansion joints in the passageways right below the flight deck.


Jim Driscoll, MSI Raider GE76 12UHS-607 17.3" Gaming Laptop Computer - Blue Intel Core i9 12th Gen 12900HK 1.8GHz Processor; NVIDIA GeForce RTX 3080 Ti 16GB GDDR6; 64GB DDR5-4800 RAM; Dual M2 2TB Solid State Drives.Driving a Sony KD-50X75, and KDL-48R470B @ 4k 3724x2094,MSFS 2020, 30 FPS on Ultra Settings.

Jorg/Asobo: “Weather is a core part of our simulator, and we will strive to make it as accurate as possible.”Also Jorg/Asobo: “We are going to limit the weather API to rain intensity only.”


 

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Guest zzmikezz

Joke Alert! I repeat, this is a Joke Alert!xxxxxxxxxxxxxxxxxxxxxxxxSo okay, folks,Some ships may have expansion joints. And guess what? Some Southwest Airlines aircraft may also have expansion joints, though these were not a factory option and in fact were installed by the maintenance operation.

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As everyone's said it's designed to do that. What someone explained to me is that it's called "elastic deformation" - the HY steel is designed for a certain amount of stress in all axes. It will "deform" so much and then it goes back to it's original shape... Then when you exceed the material's ability to deform then it's called inelastic deformation like when a missile explodes and causes a big hole in the side of a ship - the metal will deform inwards away from the blast then fail - resulting in a hole with the jagged edges of metal pointing inwards.

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