The Triunda World Cup ball challenges conventional aerodynamics

design The official ball of World Cup 2026 It could become a decisive factor in the results of the 104 matches that will be held during the tournament. According to new research, the ball known as the Triunda is the first ball in the history of the Men’s World Cup to be made with just four panels, a feature that changes the way it cuts through the air and therefore changes the ball’s acceleration, trajectory and range.

As is the case every four years since 1970, Adidas unveiled the official match ball for the 2026 World Cup in October last year. Triunda attracted attention for its appearance with a tri-color design representing the United States, Mexico and Canada, the host nations of this year’s cup, but it also raised doubts due to its unprecedented four-panel construction thermally bonded with heat and adhesives, a configuration that has some questioning the stability of the ball on the field.

John Eric Goff, a visiting professor of physics at the University of Puget Sound and co-author of a study on ball performance, explained in an article published in Conversation “Fewer panels can indicate a shorter overall contact length, and therefore a smoother surface. Smoothness is important because the thin boundary layer of air adhering to the surface determines where the flow separates, how big the impact is, and how much drag the surface experiences.”

The Jabulani ball, which was used in the 2010 World Cup finals in South Africa, had a similar property: during matches, it caused unexpected changes in the direction of the ball or a sudden decrease in speed during flight. In an attempt to counter this, Adidas has incorporated deep stitching, three pronounced grooves into each panel and a textured surface designed to improve the Trionda’s aerodynamic stability.

Goff and his colleagues sought to determine whether these modifications were sufficient to avoid the irregularities observed with the jabulani. To do this, they subjected the triple wave to a series of wind tunnel tests, a technique used to analyze the interaction of air with moving objects under different conditions. The tests made it possible to measure the ball’s aerodynamic force parameters, for example, parameters that describe how the ball impacts. Air generates clouds It adjusts flight stability.

In addition, the researchers analyzed the so-called “aerodynamic drag crisis”, a phenomenon that occurs when air resistance suddenly changes when certain speeds are reached. The results obtained using Trionda were compared with similar simulations performed on previous World Cup balls: The Flight (2022), Telstar 18 (2018), Brazuca (2014), and Jabulani (2010).

the Experiments showed The Trionda would reach the critical point of aerodynamic drag at a speed approaching 43 kilometers per hour (km/h). This figure is lower than the 50 to 65 km/h range recorded by the Adidas Journey, Telstar 18 and Brazuca shoes, as well as the 79 to 97 km/h achieved by the Jabulani.

Courtesy of Adidas