I just put a Turnigy 36 48 in mine... LIke stock on 3S. Very spirited on 4S. But the cowl wouldn't fit...

And with the extra weight combined with the stress of higher speed maneuvers, Ifolded the wing during flight.....

It didn't fold in the center, it got too stressed where the spar/tube goes through the wing and ends near the aileron servo.

I'll have to see about reinforcing that.