| abstract |
A device comprises an enclosure (8), a flywheel (1) located within the enclosure, one or more bearings (3) that allow the flywheel to rotate independently of the enclosure, and an opening (7) in the enclosure to allow the insertion of a charging device (5), the charging device serving to rotate the flywheel and store angular kinetic energy within the flywheel. Preferably, the enclosure comprises a circular circumference in a plane aligned with the enclosed flywheel, the device being symmetrical about the axis of rotation of the flywheel at this circumference such that the device may be rolled along a level surface, along this circumference, whilst the enclosed flywheel is spinning. |