actually, it's not a "theory",.. it's fact according to some NASA researchers. There was a paper I read quite a few years back on NASA testing in wind tunnells. Their conclusions were that the "perfect" trailing edge can't be had because we can't get them that sharp (tapered, razor sharp). The next best thing was tapered down, but with a flat edge,.. then completely flat with no taper. The absolute worst was a rounded trailing edge. i would agree, it's probably so small an affect on a plane designed to fly at these speeds, that it could _possibly_ be irrelevant,.. however,.. I do get a pretty good head of steam sometimes,.. I think knife edge loops probably see the most speed, then the pullouts from 270 degree stall turns ("hang" almost in hover from a vertical climb, and just as vertical speed stops give full throttle and full rudder,.. flying ail/elev to keep the roll/pitch oriented correctly as it pirouettes 270 degrees and flies out knife edge). It can realy get moving in that one. As for the appearance,.. I build things for one reason,.. TO FLY THEM,...,.. so I'll make concessions to appearance without thinking twice if it helps flying ability