X2 Airfoil
Dave, in my previous note I was referring only to the S-61F's prior experience with cruise main rotor autorotation, as applied to the background with which the ABC proceeded. Byron Graham was a pilot in each.
Your sentence with re to the X2 airfoil is to the point: the airfoil is the most complex I have seen on a flying prototype, and to date I believe that the X2 team is happy with it. The next testing phase is where we shall find out.
Thanks,
John Dixson