Today other measures were performed with the efficient 42 cm diameter tire.
Then other measures were performed by reversing the two anemometers, the one inside the tire on a tube, and the other one in free air. Said tube was moved through three positions, so that the anemometer rotor was placed in the center, then between the center and the edge, then at the edge, as shown in the next three photos. Wind speed in free air was 4 to 5 m/s. As previously, the anemometer inside the tire indicated a value 25 percent higher, so respectively 5 m/s for 4 m/s in free air, and 6.25 m/s for 5 m/s in free air,regardless of its position at the center or at the edge or between the two.The effectiveness of the 42 cm diameter tire as a shroud was therefore confirmed in the different experimental configurations.
(PDF) Flexible kite carrying a turbine within a torus-shaped balloon. Available from: https://www.researchgate.net/publication/388800040_Flexible_kite_carrying_a_turbine_within_a_torus-shaped_balloon [accessed Mar 02 2025].
Anemometer rotor in the center of the 42 cm tire
Anemometer rotor between the center and the edge of the 42 cm tire
Anemometer rotor on the edge of the 42 cm tire
