You know, that's a great point. The Edge 540 technically has forward sweep. I wonder how one would do as you exagerate the sweep angle. I wonder if they get to where they won't snap roll?


One other thing I meant to mention earlier. While there may be some advantages to this, obviously it's not very practical for a fighter. The X-29 was flown for quite a while, then retired. Since then, the US has designed the two main next generation fighters, at least - and fsw is nowhere in sight.

It could be practical for fuselage space reasons. There was a business jet built in Germany called the Hansa jet that had the wings forward swept and the engines mounted on top of the wings. That was so the spar would run behind the passenger compartment. This was an all metal airplane with moderate sweep. And I've seen at least one high perf glider design where the spar runs behind the seat but the wing is kicked forward.