Another tip, always try to keep an extra section of track on the runout -- I've had shuttle loops run to the end of the track just fine for months, then suddenly crash though I haven't increased the speed at all. There's nothing quite so sour as having such a money-maker crash and no one will go on it for weeks afterwards! Ugh.
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Po!nt of View: A different look at Roller Coasters.
http://www.crosswinds.net/~justmayntz/thrills/
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