If I may interject, I'm not sure if I'm reading you correctly or not, but isn't the idea to have the vortices of turbulent - and therefore energized - airflow actually wash over the main wing? Since this increased energy within the airflow is what actually keeps it attached to the wing in high AoA maneuvering.
So when canard & wing are mounted in plane the canards have to have dihedral to make sure the vortices don't hit the wing in the center, but actually wash over it.
But it's not really about keepig the air off the wing in those circumstance, is it?
Scratch, I'm not an aeronautical engineer, that would be Jeff Heads area of expertise, so no math, or algebra equations etc, but bernoulies principle which states, and I paraphrase
" as the velocity of a fluid increases the pressure drops". As I stated with my understanding, the canards have a very noticible dihedral, this is so the " tip vortices" of the canards, do not interfere with the turbulent boundary layer airflow of the main wing" causing the boundary layer to depart or separate from the upper surface of the wing, causing a stall. This is a "gross oversimplification" I believe that you and I are on the same page, without the canard a rear mounted delta will not generate sufficient control authority with the aft mounted control surface to generate the high AOA necessary to play the ACM game, given the high level of all the players. The air over the upper surface of the wing is accelerated in relation to the air over the bottom surface of the wing, causing the air pressure on top of the wing to be lower than the air pressure beneath the wing creating lift, when you create lift, you also create drag, hence you bleed airspeed at high angles of attack. If you look at modern fighter aircraft of a conventional planform, they all have strakes from the leading edge of the wing toward the nose of the aircraft, this also creates lift and helps keep airflow attached at high angle of attack. I pointed out the active Eagle simply to illustrate how long the high dihedral had been a part of canard installations on jet fighters. As Jeff could explain with cad/cam there is an almost infinite combination of wing shapes and blends to achieve the flight characteristics you desire. Bax
