Ribcap was not created to compete against helmets. Ribcap's goal is to offer a safe alternative to athletes that refuse to wear a helmet for their particular activity or sport.posted by ikkyu2 at 12:24 AM on December 6, 2006
..If you are participating in a sport of high-risk that requires use of a CSA helmet, please use a CSA-approved helmet.
v_{brain_0} = a_{max} x ΔtTo be clear, this is the minimum Δt. The actual event will be highly non-linear, but given a maximum acceleration, the quickest possible way to stop is to slow at a_{max} until you stop.
15km/h = 50g x Δt
4.17m/s = 490m/s^{2} x Δt
Δt = 8.51 x 10^{-3}s
d_{min} = int_{Δt}( v_{brain}(t) dt )Which is, you know, pretty close to 1".
= int_{Δt}( v_{brain_0} - a_{max}t dt )
=int_{Δt}( 15km/h - (50g x t) dt )
= 4.17m/s x Δt - 490m/s^{2} x Δt^{2}
d_{min} = 1.776 x 10^{-2}m
posted by MonkeySaltedNuts at 6:29 PM on December 5, 2006