Comments by "Keit Hammleter" (@keithammleter3824) on "SHOULD YOU TOW WITH A CYBERTRUCK?! - (catastrophic failure test)" video.

  1. There's nothing sane about the Cybertruck. The point of this video is not that it failed under a huge static load, the point is that the static test, while easy to do, indicate the Cybertruck will catastrophically fail under a dynamic load that conventional vehicle will only bend a bit. Because the Cybertruck is built by sticking pressure diecast parts together with adhesives, it will be subject to Coffin-Manson failures.- a failure mode well known to aircraft engineers and electronics people, but unknown in the automotive industry because for all intents and purposes Coffin-Manson failure does not exist in conventional steel ladder frames nor in steel unitary construction. (Coffin-Manson failure applies whenever you have rigid materials of different temperature expansion rates bonded together eg by soldering or by adhesive. Over time, temperature cycling, eg from weather, causes cracks to propagate in the bonding. Even when the two bonded materials have the same rate of expansion, Coffin-Manson failure can still occur due the temperatures on either side of the bond being different. As in an external panel exposed to the sun or wind glued to something that isn't.
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  2. After World War 2 Britain was bankrupt. So their government implemented an number of measures, including borrowing huge amounts of cash from other countries. And rationing steel. Car manufacturers were not permitted to buy steel unless a large fraction of the steel tonnage was used for export vehicles. So Rover decided to make car bodies out of aluminium. But they retained a steel ladder chassis in these vehicles. This let them get allocated more steel than would otherwise be the case for the number of vehicles exported. But aluminium body panels did not make a lot of difference. If it was safe to make an aluminium chassis as well, they would have. Aluminium is good in aircraft because aircraft are not subject to large sudden localised dynamic loads. Even so, they have a fatigue life that cars do not.
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