I flew mine for about 150 flights with a TT pro 46. I am not sure of the speed. But it was about 20mph faster than a poane we radared at 90mph. I used a ST 40 muf. with a 9x8 apc. In later flights I have pulled full up at top speed it is quite fun. No problems except they dont take 90mph touch and goes verry well. I didnt kill it I just hurt it a little> It will fly again.