Why not just create a different helmet. One that has a hard layer sandwiched between two soft layers to absorb the impact?
Even a half inch soft exterior layer over that hard layer would make a huge difference.
Ever since I was little, I never understood how hard helmets colliding helped protect a man. There's no crumple give which means it's an immediate stop at impact.
[ Edited by Joecool on Feb 9, 2010 at 12:14 AM ]