Multi-Wing
The counter-rotant configuration consists of placing 2 fans in series, with the flow in the same direction but rotating in opposite directions. The second fan receiving the air minimizes turbulence similar to what guidelines would.
Fans against rotators increase efficiency compared to fans in series with the blades rotating in the same direction. In counter rotant a pressure of up to 3 times that of an individual fan is obtained, compared to 2 times the pressure obtained from a fan with the same mount but rotating in the same direction.
On average it can be concluded that with a counter-rotant configuration, about 2.5 times the pressure generated by an individual fan is obtained.
Multi-Wing has symmetrical options for turning to the right and left of the blade models. Also of propellers in blowing and aspiring configurations to manufacture sets of propellers to work on fans against rotants.
