The TRV4 uses a combination of previous ideas to simplify construction and improves the venturi intake.
I also wanted to try a rotor that uses airfoils configured at two different diameters. As with any turbine, the smaller the diameter of the rotor the faster the turbine runs but it has lower torque. The larger diameter has more torque but runs slower. The idea of this rotor is to see if the inner rotor airfoils would drive the outer rotor airfoils to a faster speed. When the machine becomes loaded, the outer airfoils will provide the torque required to maintain the load.
Like a bi plane, the inner rotors are shorter like the lower wing and they trail the top wing so it does not interfere with the lift. So far the results are very positive. The turbine starts instantly with the slightest breeze. Next step is to mount the pumps.
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