taiwnaeaa, it produced about 1.25N of lift with the cylinders spinning at approx. 8000RPM and the entire rotor spinning at 200RPM. But it could produce more than this if these speeds were increased. However, the ratio of these speeds must be chosen such that at every chordwise position along the cylinders the ratio of the tangential speed of the cylinder surface is around 2.5 times greater than the oncoming flow velocity. This is required to suppress vortex shedding behind the cylinders.