Aileron Reversal
I don't have a copy to hand, but Jeffrey Quill's fascinating book "Spitfire" describes the problem of aileron reversal being met on some marks of Spitfire, causing significant torsional stiffening of the wings to be required.
I've met one modernish light aeroplane (the CFM Shadow) which depending upon model can do this in a big way also.
However, can anybody refer me to any other aeroplanes that have had aileron reversal problems - ancient or modern?
G