 In order to give it a rolling and pitching motion, it was mounted on a 5 m (16 ft) square iron frame on a gimbal.A combination of hydraulic cylinders, chains, and electric motors allowed the platform to pitch by up to 50 cm (20 inches) from horizontal, and to roll by up to 20 cm (8 inches).The realism of the attraction derives both from the theme they represent and from the technology that puts passengers in the middle of things and the simulated movement.