Article title: Aerodynamic and surface comparisons between Telstar 18 and Brazuca
Adidas has provided the match ball for the World Cup since 1970. It has unveiled the Telstar 18 to be used as the official match ball. Like Brazuca, Telstar 18 has six thermally bonded textured panels, but the panel shapes are quite different. The work in this paper compares Telstar 18 and Brazuca soccer ball designs in anticipation of the 2018 World Cup in Russia. Experimental determination of aerodynamic coefficients prompted the development of computationally determined soccer ball trajectories for most launch speeds experienced in actual play. This article reports results of wind-tunnel experiments verifying previously published work for the Brazuca and introducing new data for Telstar 18. Wind-tunnel results were used to create model trajectories that illustrate how the balls’ aerodynamic properties lead to various flight trajectories. The authors of this article are anxious to watch the 2018 World Cup to see whether modeling predictions presented here are realized during play. The work presented here tested and modeled only World Cup balls without spin.
Aerodynamic coefficients were determined for Telstar 18 and Brazuca, match balls for the 2018 and 2014 World Cups, respectively. Experimental determination of aerodynamic coefficients prompted the development of computationally determined soccer ball trajectories for most launch speeds experienced in actual play. Although Telstar 18’s horizontal range will be nearly 10% shorter than Brazuca’s horizontal range for high-speed kicks, both Telstar 18 and Brazuca have similar knuckling effects due to nearly equal critical speeds and high-speed drag coefficients that differ by less than 10%. Surface comparisons suggest why aerodynamic properties for the two World Cup balls are so similar.
Aerodynamic and surface comparisons between Telstar 18 and Brazuca
John Eric Goff1, Sungchan Hong2, Takeshi Asai2
First Published 19 May 2018
Proceedings of the Institution of Mechanical Engineers, Part P: Journal of Sports Engineering and Technology