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Comment by incone123 | Hacker News Reader

I went to an ejected pilot call when I worked in EMS. Guy was ok but protocol was handle as potential spinal injury. The force of ejecting puts a lot of compression on intervertebral discs and the effect is cumulative so more ejections means more chance of trashing your back.

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I'm surprised they don't design the seats such that they pop out two bars under your armpit so that you transfer some of the forces into your shoulder and collar bone instead of just the spine.

Same way car seat belts horribly injure people if they let it rest on their stomachs instead of on their hips.

The forces involved would only pop your shoulders and not provide any support for your back via your underarm. And the speed the bars would need to come out at, might end up inside your chest cavity. The ejection seats are a last ditch save from certain death. I’d take the loss of an inch or two to my height than the alternative.

These things are rocket powered and deploy in milliseconds. That sounds like a great way to exit the plane without your arms.

Not a bad idea at face value but as opposed to seatbelts it introduces additional complexity that has to handle every eventuality including G forces from any direction, and still function perfectly. Probably has failure modes that increase injury risk. But this isn't a bad line of thought to go down, ultimately.

1) It's too fast.

2) Think your shoulders could take it?? It's IIRC ~15g.

I do think they probably could make a gentler ejection mode as the seats are built for the worst case. The lower your airspeed the longer you have to get high enough to clear the tail and thus less acceleration is needed.

Visceral grok: there’s a reason supporting yourself on crutches versus standing sucks; your spine is meant to bear load.

I guess a taser like electro stimulation targeted to get the right muscles to tense up to ease a bit of pressure on the joints might help

But i have no idea

Doesn't the pilot press the button to do it himself? It's not like it's a surprise, he can tense the muscles beforehand.

True, but how much control do you have? Seems taser can occasionally provide more muscle control than volition, as that is why it incapacitates.

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