So I got my new wing, got it all lined up and installed, then go to fly. First flight was good, took some trimming, but flew pretty good, landed fine, then did some adjustments. Second flight was worse than the first one because I moved my elevator the wrong way so it took even more trim. I landed it fine, then made more adjustments. 3rd flight, the airplane flew very well. It tracked perfectly without any trim at all. I started doing some loops and rolls, then while in the middle of one of my loops the wings collapsed and it fell straight to the ground. Since I was over a parking lot, the impact destroyed my engine and airplane, the only things that survived was the radio and servos, which will need some serious testing before I trust them.

Anyway, I'm trying to figure out why the wing failed. As you can see in the picture:



The wing did not fail where I glued the halves together. The balsa that mates those together are still in tact. The airplane is a tower trainer rated for a 40-46 engine. I have a OS .46fx in it with a 12x4 prop. I am running the large prop because it helps the airplane slow down better when landing. I am using throttle control and was not a full throttle when I did the loop, but was moving at a pretty good rate.

Here are my questions:

Is this type of failure common?
Was this something that I did to make it fail?
Is this something that the manufacturer should warranty?
Was I using way to much engine for this plane?
What should I get to replace it? Is there a trainer that is stronger but not to expensive?
Should I buy something designed to do loops and rolls since I'm not having any problems landing the trainer?

Thanks,
schu