A friend of mine has had his Epsilon ARC since last fall. This week he was flying it and had elevator problems. Luckily he had enough elevator to land without crashing. The ply elevator mount doubler (that raises the elevator servo to clear the rudder servo) came loose. The elevator servo was floating around in the fuse. I had previously removed that piece as I set up my controls differently. I took an exacto knife under one corner and pried up on it. It popped right off. Way to easy. ARC owners may want to check to make sure the elevator servo doubler is attached properly.