I had a .40-sized Sukhoi once. It was *very* pretty while sitting on the ground but it never flew right. I've written about it here already; links follow.

The Attempted Murder

The End

Even after the dam thing tried to kill me I still gave it another try. Stoopid.

I was lucky in that the airframe suffered all the damage - the radio gear and engine were fine and soldier on to this day in my Somethin Extra.

My point? If you have a plane which you're thinking about retiring for whatever reason - it doesn't fly right, bored with it, etc. etc. retire it! Wait too long and you might just end up retiring an engine and some servos....