keithl!
So, what tipped it over was landing with the brakes applied. Seems very straightforward to me.
Stuff and nonsense! I don't thinkthe brakes were probably applied at all! Everybody forward of the wing died, so who is to say the brakes were applied? Doing that may cause a gear collapse, but have no effect on tipping the aeroplane nose up like that. The aeroplane
would not 'settle back because the brakes were applied after T/O'- that has no effect whatsoever! In fact I think the Liberator retracted main undercarrige backwards into the wheel well, so gyroscopic forces would not apply, but they would into a sideways retraction a la Spitfire. This is either a take-off or landing overrun hitting embankment/ditch and tipping up. The reasons for that may be overload, wind effects, wrong flap, lack of full power or engine failure.