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@philjay
[ame="http://uk.youtube.com/watch?v=PlWmu4RaRQs&NR=1"]YouTube - Surly CrossCheck with "Power Assist System"[/ame]
That thing is the most epic fail..no need to go into the actual contraption's details. F/m=a, the weight will probably cancel out any kind of stored potential energy stored by the springs.
Still a good if not wacky piece of engineering though! :D