BlenderPilot
I remember an instructor at NTPS telling me that the shaded area on a HV chart should not be called the avoid curve but the “area of increased vigilance” as helicopters are designed to work there (but not fail very well from there).
Not being a helicopter pilot (or pilot of any sort) could you elaborate on the technique used for this particular flight case. Presumably you are talking about engine failure in a single engined aircraft. How valid is the technique when starting with a rotor speed that is likely to be below the datum speed (as I am assuming it was when you were training) due to the IDT (intervention delay time) resulting from the time taken to recognise and react to such a failure?
lhb