Originally Posted by
Lonewolf_50
@GoodGrief: in the 32 years since the article you cited came out, the semi rigid, underslung, teetering rotorhead on the Jet Ranger has not caused a rash of deaths due to mast bumping. (That design is similar to that of the Huey). The Navy's still flying them at Whiting field (though there have seen better days).
I guess it has got a lot to do with sensitivity of the controls, Rotor inertia and margins.
All these seem to be much more benign in the Bells than in the Robbies. Flying into light/moderate turbulence at 80% vne probably won't let you arrive vertically and nose down without the big fan on top in the Bells. In the Robbies I wouldn't bet my Life on that.