Butterfly Turn VS. Cobra Roll

Viper at SFGAd has a heartline twist.

http://www.rcdb.com/installationgallery33.htm?Picture=4

The zero-g on Talon is the only zero-g I've been through (on an inverted) that actually gave weightlessness. I thought it was an amazing inversion though.

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The legend lives!

The difference between a cobra roll and a butterfly turn  is simple. On a butterfly turn, the track doesn't totally invert at the summit of the element. It inverts when the track starts to come down. On a cobra roll, the track inverts all the way at the summit of the element.
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