would it be possible to have 3 of each motor.. the one at low and the one at high.. it seems like in theory you could run all 6 to take off, but let them coast when "flying" versus gaining altitude?
That's absolutely doable, though you would have to prevent the inactive props from spinning and/or feather them to reduce drag. I don't really see variable pitch props on these though, the weight and complexity penalty would probably be excessive.
