Twin Rotor Venturi with Global Windgroup Blades

A couple of years ago I saw a high torque airfoil configuration build by Global Wind Group. The airfoils are arranged to produce very high torque at low RPM in a vertical axis configuration. The design was interesting but it was apparent there was high drag and vibration from the design. We have worked together to design and build a new prototype to see what kind of torque we could achieve by combining our designs and installing the rotors in the venturi frame to reduce the drag. This video is the first test run after final assembly. The twin rotors are coupled mechanically because I wanted to dyno test the machine to determine the torque that could be produced by the blades. Unlike machines designed to produce electricity I want to develop a machine that can be used in applications like water pumping, pond aeration and possibly water desalination by using wind to pump water mechanically through the reverse osmosis membrane. I will post the actual brake testing that we did later but the results were well beyond my expectations. These rotors only have a diameter of 48" and we were able to produce 109 ft/lbs of torque at 31 mph wind speed. (The gearboxes are 1:1 ratio)
I will post some footage of the testing soon. - Daryle Bezemer