Abstract: A gravity powered rotational machine for rotating an output shaft to power a generator, pump or the like. The machine comprises a frame mounted pivot bar, a plurality of first swingarms rotatably attached to a center section of the pivot bar, a weight member slidably mounted on the first swingarms, a stationary railing defining a path around the center section, a rotational structure rotatably mounted on end sections of the pivot bar, second swingarms interconnecting the rotational structure and the first swingarms, and a driving mechanism interconnecting the rotational structure and output shaft. The center section of the pivot bar is off-set from its end sections. The stationary railing guides the first swingarms around the center section and directs the weight members inwardly and outwardly on the first swingarms while they group in a drop zone and spread in a lift zone of the path to rotate the output shaft.