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[Aside: Is the pressurized cylinder actually CO2, or Argon or other gas? In my experience, CO2 being stored as a liquid only has so much potential energy. When it changes from a liquid to a gas the temperature drops dramatically, slowing down the phase change. This layman's guess is that CO2 may not be the gas of choice.]
The figure I see for inflation is 80 milliseconds, or 0.08 seconds.
Here's another video showing actual crashes with real riders that illustrate that you don't travel as far as your calculations.
https://www.youtube.com/watch?v=v79tKQbJWNo
I figured my back was only about 2 inches from the front edge of the 49L top case when my vest was actuated...and closing rapidly!
The vest was sufficiently inflated to absorb all the energy of my back on the top case with enough force to break the top case loose from the rear rack.
The numbers for closure, distance traveled, bodies in motion, etc are very similar to what we see in slow motion playback of auto air bags with crash dummies.
If you correctly install the lanyard, you should have much less than 3 feet of separation from your seated position before deployment.
I'm not trying to get into a big argument here, but I think your figures are excessive.
Glad you got a vest, and I very much hope that you, or anyone you know, never have an instance to for it deploy.
Brad