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Power steering
Power steering
The steering system had to work well -- high performance is the sled's main selling point -- and it had to be unique. "We needed to be able to patent it," Steve Luhr explains. "If a new product isn't unique enough, you can't find investors because competitors could just copy you."

Bob Worrell's solution -- a cantilevered leaf spring -- fits the bill on both counts. The flexible metal joint allows the front-runners to pivot around a central axis for sports car-like steering control.

NEXT: From office chairs to the slopes

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LAST UPDATE: Sep 29 2009 | 9:39 AM ET
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