Probably the most important thing over looked is the fact that the wing shears at a point of least stress, at the top if its climb.
Furthermore the shear point is too 'clean' and would not have broken outside the fuselage as seen in the video. They have a continuous spar and can handle many many times the G's forced on them. If a wing did shear it would probably remained clumsily attached by cables and such. Ive watched in amazement several times as one of them 'snatched' a cone, yawed a good 30 degrees only to straighten out and fly around almost sidweays with a huge chunk of cloth hanging off one wing.
Furthermore these aircraft are probably one of the most pampered on the face of the earth. These guys get 'new' aircraft almost monthly and they are torn down, inspected, and re-assembled on nearly a weekly if not daily basis. If there was a major structural malfunction it was well hidden.
Those red bull air racers are frakkin nuts and astonishingly good pilots if anyone could pull it off it would be one of them... But the simple fact is an aircraft with half its airfoil ripped off would spin out of control untill it tied the lowest altitude record.
Then there is this
http://au.youtube.com/watch?v=-_EXtB...eature=related
But that aircraft has huge stabilizing surfaces which saved his ass.