The dihedral of the two disks may eliminate the ability to provide yaw by opposed longitudinal cyclic, however there may be an azimuth on each rotor that might provide some yaw moment. For example, with the outer blades turning forward perhaps CW yaw could be obtained by increasing the Starboard rotors thrust at ?? azimuth and increasing the Port rotor's thrust at ?? azimuth. On craft with two propulsors Yaw might be provided by unequal or opposed propulsor thrust during hover, Yaw can always be provided by rudder during forward flight, however consideration will have to be given to yaw during autorotation.
