Originally Posted by
AKASHA
1) Flaps Extended - The simple reason Vmc decreases with flaps extended is because a greater component of horizontal lift to counteract yaw. There may be contributing factors, but they are secondary.
2) Gear - " Vmc does not necessarily decrease, and control does not necessarily improve with the landing gear in the extended position. The ‘stabilizing effect’ of landing gear on individual aircraft is not tested. Vmca is determined with the gear in the retracted position, and therefore the extended gear’s effect on Vmca is unknown and would vary between different airplanes and gear systems." - From a Multi Engine Instructor Document
I'm not sure I follow your flaps argument, maybe I'm just misunderstanding. Assuming level, unaccelerated flight, there is no more lift created with flaps than without, in both situations, lift equals weight. That point aside, I still don't see how increased lift (either vertical or horizontal components) would have anything to do with controllability with asymmetrical thrust. It seems to me the only effect flaps would have on Vmc is due to decreasing the effective thrust on the operating engine.
If lift had anything to do with it, you would be able to say that pulling up would also decrease Vmc, and I can't come up with anything to support that.