I would have to agree that any curve banked at over 90 degrees should qualify as an inversion. You're more upside down than you are right side up, so if that's not an inversion, what is it? Just an overbanked turn? I don't think so. Premier's Mr. Freeze coasters are billed as 4 inversion coasters by the manufacturer, even though 2 of those inversions are the result of a 120 degree overbanked turn. So, since Intamin obviously banked the overbanked turns of Millennium Force at 122 degrees to break Mr. Freeze's previous records, the question is why aren't they billing those turns as inversions, like Premier did with their coasters featuring overbanked turns? The only logical explanation that I can come up with is because Millennium Force looks and sounds scary enough as it is, without saying that it turns you upside down 4 times! But the fact is that it DOES turn you upside down 4 times, it just doesn't do so while making you 100% perpendicular to the ground. And if you still don't believe that Millennium Force has 4 inversions, look at is this way: If you were stuck at the apex of one of the overbanked turns, and your safety restraints happened to fail and come open, you would FALL out, so you ARE upside down in those curves! Just because they're not PERFECTLY upside down elements doesn't mean that they aren't inversions. If it has the potential to make riders FALL out, I say it's an inversion, and the overbanked curves of Millennium Force would certainly qualify as such!
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