Gaines-- Ive been meaning to make this post for a while, just havent for some reason. On the old board you quoted the Physics of Tennis as saying that a tighter tension will yield 5% more spin than lower tension (all things being otherwise equal). I have long thought that a higher tension would give more spin but never had anything well researched and documented to back it up. I did not know that info was in Physics of Tennis, and not knowing that for certain was irritating as I could not give my students an answer I was 100% certain of, and I wanted to know for myself as well, as Im a player that hits with heavy spin on most shots. So, thank you very much for that info. I was wondering also, as I dont have that book(yet), the tensions used in the racquets in that study? Also, is there evidence of more spin when stringing mains tighter than crosses?