Quote:
Originally Posted by BenG
I also remember reading on the old JOC forum that the indoor limit of 325fps was chosen because supposedly someone had found information that I think like 330 fps or something along those lines was the required amount of energy with a .20g bb to penetrate an eye and the idea was that this would prevent serious injury if someones eye pro where to come off in an indoor game.
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Something like that ...
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3217394/
Quote:
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The enucleated eyes began to experience lens dislocations when the KE of the projectile was approximately 0.75Nm, and retinal injuries when the KE was approximately 1.20Nm.
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1 Joule = 1 Nm ... So rounded figures gets us to ...
- 0.2g BB @ 0.75J = 280 fps or 85m/s
- 0.2g BB @ 1.2J = 360 fps or 110m/s
- 0.25g BB @ 0.75J = 255 fps or 77m/s
- 0.25g BB @ 1.2J = 320 fps or 98m/s
- 0.3g BB @ 0.75J = 230 fps or 70m/s
- 0.3g BB @ 1.2J = 295 fps or 89m/s
Black means lens dislocation and surgery, red means it made it to your retina.