I was really only considering single engine HV curves.
I just wanted a refresher as to the reasoning for the creation of the chart. I think Shawn is right on the money there and 212man's thoughts are quite correct. I know many instructors promote it not only for straight and level but also T/O.
In the last thread about this subject it was Nick L who first enlightened me to the consideration that it was not applicable for landing.
Thanks for your replies.
Steve