Official Answer
Answer
Centrifugal lift-off occurs when the RPM exceeds the ring's rotational capacity, causing it to expand and leave the groove. The signs of this failure include the ring being found 'loose' in the assembly or having heavy wear marks on its outer circumference from rubbing against the housing bore. Unlike a thrust failure, the ring will not be 'coned.' Diagnosis involves calculating the theoretical lift-off speed using the formula $V = \sqrt{\frac{Unit \u00A0 Cling \u00A0 Force}{Mass \u00A0 per \u00A0 Unit \u00A0 Length}}$. If the motor's operating RPM is within $20\%$ of this value, lift-off is the likely cause. The fix is either a heavier 'self-locking' ring or a material with a higher modulus-to-density ratio.
