Chinnock.

Had a few of these up in the Black Country recently, don't know what's going on but we don't usually see them up here ?
 
They do some night training near one of my permissions and I always get goosebumps when you hear one flying over.
 
Ground resonance is a problem which ultimately will result into a helo shaking itself to bits or in real world situation a crash on take off or landing, google ground resonance.
 
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