Earlier versions of "Half Pipe Coasters" have two large hinges in the vehicle.  (Half Pipe at Elitch Gardens is an example.)  This was required because the twin spikes had a straight section of track at the top.  The newer models, like Surfrider, have a constant curve radius even at the top of the track.  This eliminates the need to have the car flex as the track bends.

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©2010 Joel A. Rogers.