Ok, Greg....show us your mad math skills. 80mph to stop in about 18" is how many Gs? Copied from another forum:
a=V^2/2d.
a= 5194ft/sec^2. That's about 162g's.
Assuming 80MPH (which, unless I see the data logger, is probably a gross overestimation of the speed
at impact) ...
80MPH = 117.333 feet/second initial velocity
0MPH = 0 feet/second terminal velocity
Delta = 117.333 feet/second
Delta ^2 = 13,767.11
Distance = 1.5 feet
Delta ^2/(2xDistance) = 4589.037
1Gee = 32 Feet/second^2
Gamma/Gee = 4589.037/32 = 143.4074 "Gees"
And if he had taken that deceleration, he would have had more significant internal injuries from the force of his organs and other soft tissues slamming into his body.
You know the track and the speeds in that area. I feel 80mph is a reasonable assumption...and yes, I know what assumption means.
How many seconds was he sliding sideways? You scrub alot of speed off when the tires aren't rolling. At 60MpH, the deceleration is 80.67 gees. At 40MpH, the deceleration is 35.85 gees .
And my ISAAC still remains superior as I have had zero crashes where it would have been useful while wearing it and you have had 1 where yours was useful. Obviously, the reasoning the ISAAC is a better device is that it works premptively and actually prevents impacts....