On August 20, 1991, a Gravitron spun itself apart at the Missouri State Fair, injuring seven children. The accident led to a multi-party lawsuit against Murphy Enterprises, the operator of the ride, and Wisdom Manufacturing, resulting in modifications to the rides and stricter safety standards. The ride can be assembled in less than six hours and packed up in three. The entire ride racks on a single 15-metre (50 ft) trailer for transport. There are a few versions of this ride that do not have a ceiling (i.e. Some variants include closed-circuit television cameras, allowing waiting riders and passersby to observe the ride in action. Part of the operator's duty is to control lighting and music in addition to the ride itself. The ride operator is located in the centre of the ride. There is usually a light-up sign on it which usually says "THRILLER" but sometimes this will say the name of the show. At this speed, the riders are experiencing centrifugal force equivalent to three times the force of gravity. The ride can reach a maximum speed of 24 rpm in less than 20 seconds, due to the 33 kW 3-phase motor. As the ride rotates, centrifugal force is exerted against the pads by the rider, removing the rider from the floor, due to the slant. Riders lean against these panels, which are angled back. The ride is completely enclosed, with 48 padded panels lining the inside wall.
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