I just got one of these last friday, its powered by an irvine 53. I took it to the flying site to test it and when I got it up it flew very nicely for about 3 circuts then the tailplane just went and started flapping badly, it looked as if it was going to come of but I manage to get it down safely. I then looked over the tail area and saw that it had crushed the the fusalage under the tailplane on the left and above the tailplane on the right, even a clevis had snapped of on 1 of the elevators so I guess I landed it with 1 elevator. I cut out the crushed parts and glued in a block of spruce instead of balsa because its harder and still light. After that dried I glued those 4 triangular things on it (havent a clue what there supposed to be for as it doesnt say anything about them in the manual). Anyway I'll see how it goes this weekend properly hopefully if it holds. I might change the rudder pull pull system to the wire things instead because they bind quite a bit.