drag reduction ... is 8.7%?
I appreciated the mention of the Wells turbine, but then they go on about angle of attack.
Quote:
Wells turbine
The Wells turbine is a low-pressure air turbine that rotates continuously in one direction independent of the direction of the air flow. Its blades feature a symmetrical airfoil with its plane of symmetry in the plane of rotation and perpendicular to the air stream. Wikipedia
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