Sid,
Interestingly, in your posted copy of the RFM for the H500 Height Velocity Diagram, it doesn't state "HEIGHT", it states on the vertical axis "ALTITUDE ABOVE TERRAIN - FEET"
So what's the difference between this and HEIGHT?
This is a HEIGHT VELOCITY DIAGRAM, not an ALTITUDE VELOCITY DIAGRAM. right?
Chopjock, you do realise on what parameters full size aircraft performance is based on don't you?
… or b.