Originally Posted by
Machinbird
Since the elevators are very close to the aircraft's roll axis, any roll moment generated by the split elevators can be countered by the ailerons and spoilers which are much further away from the roll axis and therefore have a much greater moment arm, which is conjecture also, but results from the application of simple physics.
I have no doubt that a pilot briefed on the behaviour should be able to counter it, as you say. I still wouldn't rate the chances of countering that if such behaviour was not widely known.
In any case, we're digressing here - the point is that modern yoke designs are more complex than Lyman suggested.