Looking at VC10.net it says that the RB211 produced slightly less thrust than 2 Conways. Does anyone know why this plane got bent, like did the RB have different torque characteristics, or was it mishap?
It wasn't the forward thrust of the RB211 that was the problem.
It was the forward thrust of two Conways on one side combined with inadvertent deployment of the RB211 thrust reverser on the other side - that would probably have been enough to bend any airframe.