An update of (PDF) Savonius and Darrieus VAWT side by side AWES
Savonius and H-Darrieus rotors of same diameter and same TSR
The Figure 6 [6] represents curves indicating that a high or correct power coefficient (Cp) at a low TSR (below 1) with cambered blade at a relatively high solidity. As a result, the Savonius and H-Darrieus rotors can be of same diameter, as shown on the sketch below. Two advantages are an easier maneuver, and a lesser deformation problem [4] when inflatable [2 and 3] H-Darrieus blades are used.
Unique Savonius rotor
A unique Savonius rotor could also be implemented to simplify.
Sketch
The two types of rotors described above are represented in the sketch below.
Design of the Savonius rotor(s)
The publication titled “Magenn Power Inc. - Magenn Air Rotor System (MARS)” [5] indicates a new design of “MARS” (Savonius) rotor in the pages 25, 26 and 27. The sketch above picks up certain elements but not “The moveable “clamshell” style blades were operated with compression cylinders, allowing them to pivot open and then retract during each rotation cycle” (page 25 [5]). Indeed, this would lead to an excess of complexity and a possible loss of Magnus effect. The selected elements are the large and well-shaped blades around the balloon. They are fixed on the inflatable discs which include the rope-drive transmission leading to a greater lightness because the generator is at ground.
About the already discussed publication titled “Magenn Power Inc. - Magenn Air Rotor System (MARS)”:
Also mentioned on Magenn - #172 by PierreB