At a fair, a gravitron can go at 24 rpm speed in less than 20 seconds. This is because of its 33 kW 3-phase motor. It is possible for a strong rider to stand horizontally on the pads. To learn more about the ride, visit http://en.wikipedia.org/wiki/Gravitron.
Fast enough to hold you in place by centrifugal force. If you like headaches, dizziness, nausea and not being able to walk straight for several minutes after the ride ends, this is definitely the ride for you.