Ground Resonance

Ground resonance is a destructive force the can severely damage a helicopter. This phenomenon is a potential in multi-bladed helicopters.

Although more common in a takeoff, the following video shows that it can happen when already on the ground. The student appropriately picks the helicopter up right after ground resonance starts. Once the student picks the helicopter into the air, the issue is resolve.

An interesting example of ground resonance was in the making of a scene for the original MacGyver TV show. In the example, the Gazelle helicopter gets into ground resonance and the pilot lifts off. The footage was left in the actual episode.

The example of In the following video, the pilot fails to lift the helicopter off the ground.