Also....i would recheck the entire airframe as well for buckeld covering and such. I have seen a 36% katana do exactly what yours did , but a lot worse. Motor was a BME 110 spinning a 28-10 prop when the prop came apart in the middle. It shook the plane so violently that it factured parts of the fuse , tweaked the wing tube , and some small fractures on the wings themselves. And then looking back towrads the back of the plane it broke some of the hinges on the rudder and elevator along with some other broken wood under the covering. If i remeber right.i think one of the elevator actually fell off on the final aproach ( it was deadstick landing) , it was only hanging by one hinge and then it gave way too. Total time for destruction was probably about 2 seconds. He got it in and landed it , but had alot of repairs. Check all your covering for wrinkles and such....it's a good sign some of the wood moved.