Was that really a "miscalculation", though? I thought it was a never-before-seen aerodynamic effect that nobody could have predicted in advance. It's not as tho

Was that really a "miscalculation", though? I thought it was a never-before-seen aerodynamic effect that nobody could have predicted in advance. It's not as though the engineers incorrectly declared it safe against torsional-mode aerodynamic flutter.