Vaguely recall that Peter Snell's accident appeared to be a roll inverted and pulled through at lowish level? Euan English crashed while dog-fighting with another T-6? His back-seater (son?) survived?
Distracted while at Arundel cricket a gew years ago by a Harvard pulling a very tight left turn at altitude overhead: "watch this" I said, and we saw it flick through from near knife edge left to knife edge right; presumably a deliberate demonstration of its foibles.