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Stumbled across the other day a Bose car suspension system.
Yep the same Bose that makes high end audio equipment.
They have developed an Active car suspension system
http://www.bose.com/learning/project_sound/suspension_challenge.jsp

I wish I knew now to imbed video here, I don’t so here is a link to youtube.
http://www.youtube.com/watch?v=eSi6J-QK1lw

http://www.youtube.com/v/eSi6J-QK1lw&hl=en&fs=1

I would think Glide distance over rough surfaces would be significantly better. You would not lose as much energy into the moving the mass of the up and down in the bumps.
But then….
You would need to put power into the suspension, that could cancel out any glide gains.

That video is so amazing that I initially thought it was fake. Great technology for passenger trains, school buses, moving trucks, ambulances, tractor/trailers and of course the rest of us. This could drastically reduce repair costs on vehicles and even save lives.

I also found the Nissan suspension video entertaining... - Dale

Quite impressive!

Here's another slightly longer one which seems to have bits of an english interview (though I couldn't find one all in english):

http://www.youtube.com/v/Lyf4rfT7bHU&hl=en&fs=1

http://www.bose.com/controller?event=VIEW_STATIC_PAGE_EVENT&url=/learning/project_sound/suspension_challenge.jsp