ground resonance
imbalance helicopter rotation when the blades become bunched in the rotational plane, typically on the ground when the landing gear is prevented from freely moving
en-GB/ˈɡɹaʊnd ˈɹɛzənəns/
en-US/ˈɡɹaʊnd ˈɹɛzənəns/
imbalance helicopter rotation when the blades become bunched in the rotational plane, typically on the ground when the landing gear is prevented from freely moving