I remembered the old Palmer article, and dug it out of good ol' Dec 1959 for you. I'll post pics below; I hope are easy to see on your screens. He admits a potential negative effect in theory at the end of the article, yet states he does not experience it at normal stunt speeds...Also mentions neg effects of the larger flap that motivated the experiment. It's an interesting read for 1959! Hey Tye, if nothing else, this also shows an inverted engine Tbird in a 1959 article for that other post of yours in the Classic forum.
EricV