John Tullamarine
Its really nice to go away for a few days and on return find somebody has sorted out your problems. Hope you have now convinced Wilfred!
I had hoped that my attempt at convincing W that the Cl max would reduce with height (thanks to the stalling alpha reducing with increasing speed and or height, due to compressibility) but I only seemed to confuse him further – judging by his comments on wind up turns.
JF