http://serakota.blog.so-net.ne.jp/2018-03-09
Kota Sera is reporting annual "Motorsport technology and culture" seminar.
This year's theme was "Challenge to the top! Latest technology which supports the speed."
One of lectures were on Yokohama's GT500 side fin tire.
Yokohama introduced that tire to the race in 2017.
Team Bandoh and Kondo had used in the actual race.
Team Mugen had used in the test.
Fin tire has a 3mm highet of fin on outside of sidewall.
When this fin rotates while running, on the upper side where the relative speed with the air flow becomes larger, it breaks the vortex flowing out of the wheel house, which has the effect of reducing air drag.
On the other hand, at the lower side where the relative speed with the air flow becomes smaller, the air flowing out of the wheel house is discharged to the outside. As a result, the air flow of the splitter (front under panel) is urged to reduce the lift effect.
In short, the downforce increases, so cornering speed increases compared to normal tires.
In fact, drivers had an impression that he felt a more grip feeling.