How Things Work: Ground Resonance
When is a helicopter like a Patsy Cline song? When it falls to pieces.
- By Peter Garrison
- Air & Space magazine, January 2009
ALICIA TANRATH/ZION NATIONAL PARK
(Page 2 of 2)
The wait-and-hope approach is only sometimes successful, so a better solution to ground resonance is to prevent it. Helicopters with multiple-blade rotors have shock-absorbing landing gear with powerful dampers that allow it to soak up the energy that would otherwise set the helicopter shaking. When ground resonance occurs in these craft, it is usually because tires or shock absorbers have been improperly serviced.