I think there was an interference caused by my arm holding the anemometer inside the tire and which limited the wind speed, said interference maybe increasing with wind speed.
In order to improve the accuracy of measures, avoiding some interference which could have distorted the previous measurements, an anemometer was settled inside the tire. Another anemometer (with apparently the same measurement calibrations) was used simultaneously in order to see the difference of the wind speed in free air and the wind speed inside the tire.
I just made again this experiments, using a bower on a chair. At 1 m of the blower the air speed was about 6.5 m/s, and 7.8 m/s (20 percent higher) for the anemometer inside the tire exactly at the same place than the other anemometer (6.5 m/s).
A similar increase of about 20 percent was observed outdoor with wind speed of 2-3 m/s, by using the same tire with the same anemometer inside, and the same other anemometer.
A little later the wind increased to an average of 4 m/s, peaking at 5.8 m/s. The anemometer inside the tire showed an increase in wind speed of around 20 percent, peaking at 7 m/s, and with an average of 4.8 m/s. In the same time when the tire with the anemometer was tilted, the wind speed dropped drastically (from about 5 m/s to 3 m/s), even at an angle of attack higher than 45 degrees. In vertical position, the tire achieves unambiguous efficiency.
Measurements with high wind speeds remain to be taken, but it can be stated that the tire’s effectiveness does not depend on wind speed.
