Originally Posted by fdr
remaining at normal cruise AoA and below drag divergence, D.P.Davies statement is reasonable that altitude doesn't effect AoA for a given CAS (restated).
Which was the original point that I tried, although not well, to make. Hazelnuts39, I understand the point you're making; - while not entirely precise and knowing that supercritical wings do not stall uniformly and that atmospheric conditions will cause variations which must be taken into any precise account, nevertheless there is, for practical work using the kinds of displays available on the A330, B777 etc, essentially one CAS for a specific angle of attack. As
Chris Scott pointed out earlier in the thread, the angle of attack is represented on the A330 PFD when using the FPV - Flight Path Vector. Hopefully the schematic below will assist in making this a bit more clear. I believe I have used the terminology for actual flight path, (gamma), pitch, (theta) and AoA, (alpha) appropriately - any corrections gratefully accepted. PJ2
