-seth
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Hi! I'm Hungry, whats your name?
-seth
Basically, the B&M invented heartline is the first inversion where the path of the track does not provide the force to keep people in their seats(ie vertical loops, corkscrews). It relies on the people being weightless (if you watch a heartline from the side, the track may look flat, but center of mass of the trains follows a parabola, same as an airtime hill on a traditional woodie. So that's why you feel weightless. And since riders don't feel the force caused by gravity (momentarily), the rotation of the train around the track is enough to keep them in their seats without uncomfortable lateral forces.
X seems to utilize this same concept in it's two 180 flips. You'll notice, the first one especially, is is a regular parabolic hill. riders will feel weigthless, and the train is too. If the train was on flat track and rolled, it would experience a lot of strain in conteracting gravity, and riders would be slammed against their restraints. By putting it an a zero g hill, those forces are temporarily negated, allowing a seemingly impossible roll.
See, I'm like an expert or something.
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Can't this thing go any faster?
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