over 3,800hrs in a JetBox, (err that has a 2 bladed teetering-head) more than half of those hours in high altitude Mountains, with seriously eXtreme turbulence, very high winds, landing up to 16,200' & never had a negative G or mast bumping issue, never ever
not even close
but I wouldn't wanna be up there in a Robo thingy
Happy Happy
