I recall having an aerodynamics lecture a couple of days after the Tu-144 crash where we naturally wanted to pick the lecturer's brain about the accident. He told us in no uncertain terms that presence of "moustache" aerofoils on an aircraft was a dead giveaway that it had severe aerodynamic/CofG issues. As a Pole, he could scarcely conceal his delight at the event, which struck me at the time (and still does) as extremely distasteful, if perhaps understandable given the history of the two nations.