I've been wondering the other day, what is the cause for Jetranger low frequency vibrations, propably MR induced, when on ground idle with wind present. I've been tought to reposition the cyclic stick into the wind and the vibrations should go away. Sometimes they go away, but sometimes no matter what you do with the cyclic, nothing helps.
What is the cause of these vibrations? Maybe the lift is produced only on one side of the rotor disc inducing "hoping" vibrations?
Thanks
