All,
My mistake, I did mean "reference ground speed". Originally developed in a collaboration between the long gone Flying Tigers cargo airline and Qantas, and a really effective defense against wind sheer.
Actually, in a real glide approach ie engine dead, one uses the stick/pitch to control the flight path or else...
Well, who'd 'ave thunk it?? Talk about a statement of the bleeding obvious.
Tootle pip!!