Ground resonance is a dangerous and unsettling phenomenon unique to helicopters. It arises from an imbalance in the helicopter's rotor system, specifically when the rotor blades, instead of being evenly spaced, clump together on one side. This uneven distribution causes the helicopter to oscillate or 'rock' in sync with the rotor's spinning frequency. Imagine a washing machine during its spin cycle; when all the clothes are lumped together on one side, the machine starts to shake violently. That's similar to what happens in ground resonance.

This hazardous situation usually occurs when the helicopter is on the ground. The helicopter's landing gear plays a crucial role here. Under normal conditions, the landing gear allows slight movements to absorb the rotor's vibrations. However, if the landing gear is restricted from moving – perhaps due to uneven ground, sticky or frozen surfaces, or mechanical issues – it can't perform this critical function. As a result, the vibrations from the rotor blades get transferred directly to the helicopter's fuselage, amplifying the rocking motion. If not quickly controlled, ground resonance can escalate, leading to severe structural damage, or in extreme cases, a catastrophic failure of the helicopter.

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