## Maximum Energy stored in a wheel

The stresses on a spinning flywheel are primarily radial and circumferential tension (not compression), and limit rotor speeds to much lower than relativistic velocities. Recall the stuxnet virus that infected the Iranian uranium enrichment P-1 centrifuges and were destroyed because they spun out of control. See http://itmakessenseblog.com/2011/01/...-bomb-program/

Recognitions:
 Quote by Bob S The moment of inertia of solid wheel of radius r and the stored rotational energy is $$I=\frac{1}{2}mr^2 \text {, }E=\frac{1}{2}I\omega^2$$ The maximum stored energy is limited by the radial centrifugal forces and circumferential stresses at high RPM.