Originally Posted by
Robbiee
What about Low-RPM Rotor Stall? Perhaps they were doing SWP recovery (the most common reason training flights in Robbys pull into a high HOGE) and something went wrong?
At the beginning of the video the MR RPM appears “normal”. No excessive “coning” or other signs of low RRPM.
Good point though re Vortex Ring. Over controlling in the potential turbulence present during incipient VRS is a possible explanation. EG Nose drops, sudden aft cyclic application.