Dunno - I only ever demoed inflow roll and flapback with the ASE out and it always went towards the advancing side as normal.
Thanks. I only noticed it when I started showing students that they could fly away from the hover without any increase in power by gently using the cyclic trim, discovering that I also had to trim to the right to keep wings level.
I found a reply from Ray Prouty to an email a colleague had sent about cross-coupling, explaining that the control response from the semi-rigid rotor meant that phase lag was not 90 degrees but more like 80 degrees. He then mentioned that in steady pitch or roll rate (rather than accelerative), that figure might be as low as 60 degrees and doesn't depend on the hub geometry but the Lock number (ratio of aerodynamic parameters of the blade and its flapping inertia).
That's probably why I never thought of going for A2.
