Last week I had my first real crash with my EXI 450. It was all my fault doing something I shouldn't have done while learning. I hit the throttle too hard which I expected would cause a quick altitude gain. What happened though is the bird went out of control for reasons I don't know. I had almost regained control but it was too late and I hit the ground. I ended up breaking the blades (cheap wooden ones) and bending the feathering shaft. I also bent the stabilizer bar.
I replaced the blades and the feathering shaft but I thought I could just rebend the stabilizer bar to make it usable again. I'm thinking this was a mistake as the bird now has a back and forth wobble to it. I can still fly it ok, but there is definitely something wrong as the wobble is a VERY pronounced one that makes the heli go up and down from front to back while hovering at a high rate of speed. The only other thing I think it could be is the main rotor head I can't get tight enough onto the shaft. It has a pretty good amount of play when I move it back and forth. I've tightened the screw as hard as I can without stripping the heads and I can not get it tight enough to take the slop out.
Sorry if I didn't explain this well enough. I'm still very new to flying 450's. Today was my 20th flight, and it was the first one where I had plenty of room in a huge treeless and people less park. I did pretty good too! I never crashed even thought the heli was wobbling.