Originally Posted by
SLFMS
I’m wondering if use of the Vuichard recovery technique could have induced a mast bump.
When I used to teach VRS sometimes if you were “lucky” to find it she would sink very quickly, enough to give that sinking feeling in the stomach accompanied with zero or low g. With the power been low there was only a small amount of pedal used to keep the nose straight.
Using full pedal for the side slip on the Vuichard technique and if coupled with low/zero g might be the factor that introduces the roll, especially if the disk is unstable due to VRS.
There is a photo out there where you can clearly see the shear is about where the blade would strike. I assume that would rule out gearbox issue.
I was thinking along similar lines (only with low-rpm rotor stall). I just did my BFR in a 44 where we went over the dangers of not using enough pedal while doing that new recovery technique.
During one of our practice runs my instructor had me not use enough pedal and we started to spin. I lowered the collective and stopped the spin, but the wind was still making us a bit squirrelly and at one point (before I got everything back under control) the full throttle light came on.
,...and that's not the first time I've skirted with low rpm and the vortex ring state.