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This circuit (Tesla wireless transmission + edwin Grays circuit) makes the volt meter go off scale.....starting to get scary now....still not seeing sparks though....
Ground resonance can occur in model helicopters, full size helicopters and everything in between. Resonance in flight is typically not encountered because the mass of the helicopter does not encounter external forces to excite the oscillation. In flight divergent oscillations are quite possible and have been documented. Prediciting ground resonance is difficult but possible. Reference the NASA Langley Technical Report Server and search for "ground resonance" for further mathematical analysis. Ground resonance is mitigated in full size helicopters by employing the use of damping vibration isolators to attach the landing gear to the airframe. The dampeners are tuned to absorb energy at the proper frequencies of ground resonance and typically can prevent this destructive event YouTube - Ground Resonance - Side View
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