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.
©2010 Joel A. Rogers.