G-Force Limits: John Stapp's 46 Gs, Kenny Bräck's 214 Gs and Mantis Shrimp
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G-Force Limits: John Stapp's 46 Gs, Kenny Bräck's 214 Gs and Mantis Shrimp

Got something to say to this podcast? Send a voicemail, and you might hear yourself on the next episode!

The weight you feel right now is not gravity but the floor pushing up against you. This episode starts there and builds a working explanation of g-force as a measure of acceleration, felt only when one surface presses against another. It walks through why upward acceleration feels identical to a heavier planet, why an unconditioned person sitting upright loses consciousness around four to five Gs, and how gray-out, tunnel vision, blackout and G-LOC follow as blood drains from the eyes and brain. G suits and straining breathing let trained pilots sustain nine Gs, while negative Gs of two to three cause red-out because jugular veins lack one way valves.

The story then moves to the extremes. In 1954 John Stapp rode a rocket sled to Mach 0.9 and stopped in just over a second, enduring a peak of 46.2 Gs and living to 89. Racing driver Kenny Bräck survived 214 Gs in a 2003 IndyCar crash because the spike lasted a fraction of a second. Beyond humans, the mantis shrimp strikes at 10,400 Gs, jellyfish stingers fire at over 5 million Gs, and bacteria kept growing at 403,627 Gs in a Japanese ultracentrifuge.

  • Eyeballs in versus eyeballs out: why lying down changes tolerance
  • Sustained acceleration versus jerk, and how crumple zones stretch out a crash
  • A hearty back slap at 4.1 Gs and a sneeze at 2.9 Gs, compared with 3 Gs on the space shuttle
  • Cavitation bubbles that let a mantis shrimp stun prey even when it misses
  • Nematodes surviving 400,000 Gs for an hour and what that suggests for panspermia

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