From the Ride Channel:
Tony Hawk Skates First Downward Spiral Loop:
A behind the scenes look at the idea, the build and the stunt.
We talked with Tony about an idea of creating a Helix shaped ramp that could be skated from top to bottom and he was excited but also a little nervous. To make it all the way around and out, he needed a combination of the right speed, centrifugal force and friction to keep him on the vertical wall. Thanks to Sony for funding this dream and the help of Sony Action Cameras to capture the event. Skateboarding is fun.