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Can someone explain what's going on with the wing blur? He's rolling left while climbing, but why would the right wing be sharp but the left wing not? I'd expect equal motion blur at both wing tips. It's seems like the right wingtip is sharpest, then across the airplane it gets less sharp. It's not just this frame, I have a sequence of 4 frames all the same as he rolls thru about 90 degrees.
Motion blur while tracking a 'little flippy airplane' can take many forms. Since Jan Collmer probably wasn't rolling the airplane around its right wing, my best guess is that you weren't tracking the aircraft quite perfectly with your camera. The effects of roll blur and a little relative motion blur must have canceled each other out, but only at that one point out on the right wing.