Sharp rotor

Peter Sharp is the inventor of this rotor which uses both Magnus and Kramer effect. The experiments I do confirm the lift to drag ratio of 2, that is a low value in absolute terms, but a high value for a self-rotating device like the one based on Savonius design with a lift to drag ratio of 1.
Foam prototypes were realized by using a cnc cutting machine and the profile below:

Photos:

as a possible rotating kite with ball bearings:

for gliding tests:


Videos:

for gliding tests:

as a possible rotating kite:

The Magnus effect is also used by Omnidea, but a motor is implemented in order to rotate the balloon: