I had the Giles 202 on about 10 flights with a OS 46 AX. It took a while to get it off the ground but moved like a bat outta hell when it got up with a 11x7 APC prop. Anyway I too heard the fluttering sound very loudly and the wing let loose from the fuselage and the fuse snaped in half IN THE AIR!! Flat spun all the way down. All I did was point the nose at a 15 degree angle down and leveled out the plane when this happened. I am very disappointed with this plane. I had no problems and loved the plane up to this point, no stalling or anything. I am calling Phoenix tomorrow to see if this is under warranty. The problem I feel was that the wood where the wing bolts go in is plywood but attach to balsa and the balsa let loose. Too much flutter or something. Anybody have to deal with these people with warranty issues?? How are they?? The engine was enough and really moved the plane other than take off.