Comments by "David Elliott" (@davidelliott5843) on "Cybertruck E1 - Body Structure Comparison" video.

I would like to see Sandy cover the Citroen hydropneumatc suspension system. I believe it would work well on the Cybertruck. It integrates steering, brakes suspension height and body roll control. Far better than boring air bags. https://en.m.wikipedia.org/wiki/Hydropneumatic_suspension
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If you want paint just get it wrapped.
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The DeLorean car was wrecked by its management but the external skin was very thin and easily dinted.
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@StephenMattison66 Please see https://classicsworld.co.uk/guides/how-it-works-citroens-fluid-suspension/ Citroen had a hydraulic pump no bigger than a power steering pump. That feeds a hydraulic accumulator - a simple spring loaded cylinder than maintains pressure in the system. Small pipes go to suspension steering and brakes. The brake pedal is a simple valve. Road springs are nitrogen pressurised spheres which can be pumped up when necessary. Ride height is controlled by the hydraulic legs. Body roll is controlled by spheres acting across the body to keep the car level. Steering is either a fairly typical power rack. The Citroen DIRAVI was fully powered, speed sensitive and automatically self-centrered the steering. Weight of brakes is reduced because high pressure calipers can be made smaller. Less weight at the road wheel gives a big gain for ride quality.
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I’ve just rewatched this. Even a year later it’s just as impressive as last time. Sandy’s point about aluminium made me think perhaps the CyberTruck could have been made from aluminium. The simple lines would suit 3mm or even 4mm “ally”.
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You lose the fancy brake master cylinder and the vacuum servo and the vacuum pump when it’s an electric car. Steering is much the same though without the single job pump. Suspension legs add a ride height piston into the leg but it’s not complex. Electronic controlled magnetic particle dampers can be used but their value really applies on sports cars where a stiff ride is needed on the track but not on the road. There are other ways (e.g. stepper motor valves) to adjust damping on the fly.
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@StephenMattison66 Normal brakes are hydraulic top spec mountain bike brakes are hydraulic. They are heavy enough for the job they do. In the Citroen system the hydraulics are not powering big cylinders like a digger. The suspension legs are just the same as any McPherson strut. The difference is the amount of oil inside the strut. Full = max ride height. Empty = sitting on the bump stops. The gas spring acts on the piston rod. But the effect is the same as a coil or air spring acting on the strut tube.
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