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Helicopter, Meet Ground Resonance February 25, 2012

Posted by geoff in News.

Wikipedia provides us a brief description of Ground Resonance:

Ground resonance is a hazardous condition that can occur any time the rotor of a helicopter or gyroplane is turning while the aircraft is on the ground. Similar in concept to the behavior of a washing machine when the clothes are concentrated at one point during the spin cycle, ground resonance can occur with a rotorcraft when the spacing between blades becomes irregular or the damping system, including drag hinge dampers, landing gear oleo struts, or wheel tire pressure, is operating out of limits. Ground resonance occurs at three rotor rpm bands, the first at about one-third of normal rotor speed, the second at a range including normal rotor speed, and the last in a range above normal rotor speed.

But that’s probably not as informative as seeing it actually happen:

Of course, resonance is closely related to harmonic motion, a long-standing interest at this site (NSFW).


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