Not really something I am working on at all, but a while ago I had heard that engineers for some of the race teams, mainly NASCAR have developed and put into use and compression spring that has a uniform force of the entire distance of deformation. To put it better, you have a suspension spring in a car, at the exact start of travel it is at 600lbs, and remains at 600lbs until coilbind. Has anyone ever heard of this? Is this even possible? I have been rolling this around in a my head for a long while, and no matter how i come up with it, I do not see how this could be possilbe. Any insight or opinions?