Many many years ago - drone drone in one of these,
It was a windy day. So windy in fact we had to engage in the hangar and taxy out for an SAR callout to the northwest - directly into a hooly of a wind. I flew as low and as fast (not very) as I could to keep out of the gale.
As I crossed the cliff tops near St Agnes you can guess what happened. The updraughting air whistling straight up the cliff suddenly and dramatically increased the angle of attack on the blades. The aircraft flipped left to an angle I still have no idea about but it threw the crew from sitting in the door to the otherside of the aircraft and the nose rose equally dramatically. The aircraft hurled its way sort of sideways and nose up and came out of the updraught and sort of recovered itself, whilst I played tunes on the manual throttle.
I have always thought that this was retreating blade stall.
Crab - am I correct............................?