Your wisdom and advice please ...

A flying buddy and I are designing an airplane and we want to avoid potential problems that may be caused by the air off the wing affecting the horizontal stabilizer, especially with flaps deployed. We are in the early stages of the design to be similar to the Stick series with a shoulder mounted semi-symmetrical wing at about 1 degree positive incidence and 1 degree of dihedral. We can locate the horizontal stab (to be zero incidence) vertically anywhere from about 2" below to 1" above the wing within the design. The elevator hinge line will be 3 cord lengths behind the trailing edge. The total horizontal stab/elevator area will be a usual 20% of the wing area.

This is not to be a 3D or wildly aerobatic bird. Mostly it will be for weekend sport flying.

What are the best or worst vertical positions for the stab relative to the wing?

Thanks in advance for you thoughts and comments.

Bedford