Nick,
Did Sikorsky ever run models of the HV's to accommodate head winds of say....20-30 Knots and if so....what effect does Wind have on the shape (Limits) of the HV Curve?
I can recall doing numerous constant airspeed Auto's at Redhill in the Bell 206....holding 25-30 Knots/Miles Per Hour IAS and doing a slight Decel at the bottom and using up all the Collective during the landing. It quite a pleasant ride.
Add some head wind.....and it made for a very short ground slide.....and an almost vertical descent due to the wind effect.