Abstract: A roller coaster system with a passenger carriage moved in a vertical plane on a circular path by means of a jib is driven starting from a central boss, with the aid of a concentric gear wheel on which a plurality of pinions act, each of the pinions driven by its own motor. The passenger carriage can be rigidly secured on the jib, so that the passengers are flung over head, or it may be articulated on the free end of the jib, flying laterally, in the manner of a somersault swing. In the latter case, the chain drive for parallel guidance of the passenger carriage can be removed, without dismantling, together with the jib when it is supported on the latter and coupled to a stationary central structural part with the aid of a set of gear wheels.