- Who
- Oak Ridge National Laboratory
- What
- 1405 metre(s) per second
- Where
- United States (Oak Ridge)
- When
The fastest rotational speed for a ring or disc-shaped object was achieved by scientists at Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA, on 9 December 1985. Using an air turbine, the Demo 1C flywheel was spun up to a tip speed of 1405 m/s (5,058 km/h 3142.9 mph), at which speed it failed due to the stress on the materials involved.
