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Chinese Maglev test vehicle sets world record, accelerating from 0 to 318 MPH in 2 seconds (www.youtube.com)
submitted 7 months ago* by to c/videos@lemmy.world
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[–] 26 points 7 months ago (2 children)

7.2 g acceleration. You could strap a human on there and they'd survive the acceleration phase.

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  • [–] 10 points 7 months ago* (3 children)

    For an untrained person this might well be lethal.

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  • [–] 9 points 7 months ago (2 children)

    Only 2 seconds of horizontal g? Not unless they weren't securely against the seat and died due to blunt force trauma from being slammed into the seat back.

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  • [–] 1 point 7 months ago (2 children)

    Well now we need to design the train with all seats facing forward and restraints to keep people in place, and we need to have staff abord to do do a safety check that everyone is seated and strapped in before we can get those 2 seconds of theoretically-survivable acceleration.

    Come on. This is cool from an engineering perspective but will never be used on an actual passenger train.

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  • [–] 2 points 7 months ago (1 child)

    Lol I was certainly not claiming this was practical, just pointing out it wouldn't be lethal in that sense.

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  • [–] 2 points 7 months ago* (1 child)

    It’s completely not practical.

    7Gs is, granted, not categorically lethal hut average people will start to pass out around 4Gs if the acceleration is vertical, and 9 is about the upper limit that trained, fit Air Force pilots can experience without losing consciousness.

    So 7 is nothing to sneeze at even under ideal conditions.

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  • [–] 2 points 7 months ago

    Okay, again, I agree this is not in the slightest practical, but also, again, a train accelerating is not vertical g, horizontal g tolerance is much, much higher than vertical g tolerance, especially "eyeballs in" and it increases greatly the less time it is for. Some early experiments showed untrained people could handle around 20g for less than 10 seconds. Also blunt force risks could be mediated almost completely by ramping the acceleration slowly, first reminding people to brace, then gently forcing them back in their seats. Again, ludicrous, nothing designed for comfort of human passengers is ever going to be designed to accelerate anywhere near that quickly and it's completely unnecessary anyways.

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  • [–] 4 points 7 months ago (1 child)

    Yeah this link says most people can only take 4 to 6 g, but fighter pilots can take up to 9.

    https://www.sciencefocus.com/science/whats-the-maximum-speed-a-human-can-withstand

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  • [–] 6 points 7 months ago*

    As other commenter pointer out direction of force is important. Horizontal force is much less dangerous as it doesn't drain your brain of blood as much as a vertical one. If I recall correctly humans can survive 20-40 Gs of horizontal force compared to just 5-9 of vertical.

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