Ah yes... I thought maybe have 3 props in a triangle, 2 small and 1 large, with the large one rotating the opposite way, but got to thinking.. if the prop was developing the same lift as the other 2 corners, it would have about the same drag, and therefore torque, as each of the other 2 and be unable to counter their torque despite its larger diameter. (larger size means nothing)


Or.. maybe a square frame with 4 motors, in pairs rotation-wise on each side. The problem is, when you slowed one pair of them to yaw, it would reduce lift in that side (or corner on the tri-motor) and cause it to pitch.

Of course, just now when I realized you could put the pair of like-rotating props opposite each other diagonally. [&:]