Well I do not dispute the NASA claims at all, In fact I too agree razor sharp would be the best. I agree wholeheartedly, However I am convinced with models, especially designs like the Funtana, the structural integrity of the airframe would be compromised long before the negative effects of a rounded trailing edge would be noticed. I had a rounded trailing edge on a midwest Cap 232, and I think it flew much faster than the Funtana will.