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Yes it's a high-tech dummy with lots of accelerometers & other sensors.
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Not great for the spine is true, compression fractures are common, although modern seats have smoother acceleration from using rocket motors, and are better than the original seats/installations which used something akin to a shotgun shell.
el_presidente
rodan
@midlife
Was that a dummy being ejected? I thought the G forces when the rockets went off wasn't good for the spine....