Although the main rotor blades seem a long way from the boom, it is sometimes possible for the blades to hit the boom during large cyclic inputs, as the rotor disk will tilt before the helicopter body follows it.
The most common time for a boom strike to occur is when learning, and the helicopter is landed too aggressively by bringing the collective all the way to the bottom. The combination of the helicopter hitting the ground, and decreasing main rotor RPM give the perfect conditions for the main blades to flex down and strike the boom.
- T-rex in-air boom strike on YouTube.
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