B.L.E.

While a T-tail can get the horizontal stab out of the propwash, I think it would have to be awfully tall to escape the wing's downwash. The low pressure area over the wing doesn't just lift the wing up, it also pulls the air above the wing down resulting in downwash. You would have to get that tail nearly a half wingspan above the wing to be clear of the downwash.

Any one who has raced sailboats is familiar with the "safe leeward position", a boat that's ahead of you and within a mastheight down wind (leeward) can outpoint you because you are in his sail's zone of downwash, well sidewash in this case. Sailors call it backwind or "dirty air". BTW, I took first place in the Hobie 14 Nationals in Oklahoma City in 1989.