KINETIC ENERGY RECOVERY SYSTEM

A kinetic energy recovery system is provided comprising a flywheel located in a first vacuum enclosure and a second vacuum enclosure comprising an inlet in fluid communication with the exhaust of the first vacuum enclosure and arranged to be maintained at a pressure less than atmosphere for reducing the pressure at the outlet of the first vacuum enclosure, the second vacuum enclosure comprising an exhaust through which gas can be pumped periodically at indeterminate intervals for maintaining the second vacuum enclosure at a pressure less than atmosphere. Thus an improved efficiency Kinetic energy system.