Weston Magnum build issues
UK Speedfreak,
You should have returned the kit if the balsa was really soft. Soft wood on the controls of a speed plane usually doesn't work out very well. With that said, I've seen flutter destroy entire planes. That is the price we pay to fly at these speeds. The question is more, what caused the flutter? What servos did you use, did you seal the surface gaps, was there any slop, etc., etc..
Sorry to hear that you lost the plane.
Mark