How effective is this technique in an ac with a fenestron TR?
From the description, the lateral thrust produced by the tail rotor is an important factor of this recovery. A fenestron has different characteristics to a TR, and also the tail of of a fenestron equipped ac will act as a blade which would(?) oppose any lateral thrust more than a traditional TR ac.
I can't see any references to using this technique in any other aircraft than a R22\R44.
Matthew