Rotor (ride)

Interior of the *Rotor* at Luna Park Sydney. The ride is in mid-cycle, and the riders are stuck to the wall of the barrel by the force of friction combined with their inertia. The yellow lines on the barrel wall indicate the level the floor is at during different points of the ride; the higher line is level with the floor when the ride begins.

The Rotor is an amusement ride designed and patented by German engineer Ernst Hoffmeister in 1948. The ride was first demonstrated at Oktoberfest 1949 and still appears in numerous amusement parks. The Rotor is a large, upright barrel, rotated to create an inward acting centripetal force supplied by the wall's support's force. Once at full speed, the floor is retracted, leaving the riders stuck to the wall of the drum.