John Eric Goff
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View article: The Aerodynamics of New Design Soccer Balls Using a Three-Dimensional Printer
The Aerodynamics of New Design Soccer Balls Using a Three-Dimensional Printer Open
Eight balls were manufactured with a 3D printer to resemble various types of 32-panel soccer balls. One ball was completely smooth, whereas the other seven possessed various dimple patterns on their surface panels. Seam width and seam dept…
View article: Laboratory evaluation of climbing helmets: assessment of linear acceleration
Laboratory evaluation of climbing helmets: assessment of linear acceleration Open
This study utilized a guided free-fall drop tower and standard test headform to measure the peak linear acceleration (PLA) generated by different climbing helmet models that were impacted at various speeds (2–6 m s −1 ) and locations (top,…
View article: Aerodynamic comparisons between Al Rihla and recent World Cup soccer balls
Aerodynamic comparisons between Al Rihla and recent World Cup soccer balls Open
Wind-tunnel experiments were performed on Al Rihla, Telstar 18, Brazuca, and Jabulani, official match soccer balls used in the World Cup in 2022, 2018, 2014, and 2010, respectively. Aerodynamic coefficients extracted from wind-tunnel resul…
View article: Use of Video for Teaching Sports Mechanics
Use of Video for Teaching Sports Mechanics Open
There is a shortage of young people studying physics and engineering and these professions could benefit from greater diversity. Sports engineering is often used as a tool to change the public perceptions of engineering and sporting exampl…
View article: Influence of Surface Properties on Soccer Ball Trajectories
Influence of Surface Properties on Soccer Ball Trajectories Open
In this paper, we summarize our recent research work on soccer balls. Employing wind tunnels and analyses of simulated trajectories, we have gained an understanding of how various surface features influence soccer ball aerodynamics. Wind t…
View article: Measurements of the Flight Trajectory of a Spinning Soccer Ball and the Magnus Force Acting on It
Measurements of the Flight Trajectory of a Spinning Soccer Ball and the Magnus Force Acting on It Open
The trajectory of a soccer ball, kicked with a spin to curve it into the goal, is strongly influenced by aerodynamic factors such as the Magnus force. Several studies using a wind-tunnel and high-speed cameras have investigated the Magnus …
View article: Resources for sports engineering education
Resources for sports engineering education Open
This paper serves as a resource guide for Sports Engineering educators. The paper covers key topics in Sports Engineering, including ball impact, friction, safety and materials. A variety of resource types are presented to reflect modern m…
View article: Wind-tunnel Experiments and Trajectory Analyses for Five Nonspinning Soccer Balls
Wind-tunnel Experiments and Trajectory Analyses for Five Nonspinning Soccer Balls Open
We report drag, side, and lift coefficients for two orientations of five non-spinning soccer balls (Brazuca, Cafusa, Jabulani, Teamgeist 2, and Vantaggio), measured using a wind tunnel. The air's speed range was 7 m/s to 35 m/s, covering m…
View article: Tour de France Modeling: 2015 Results and Comparisons with Elite Cyclist Power Data
Tour de France Modeling: 2015 Results and Comparisons with Elite Cyclist Power Data Open
For the past dozen years, our research group has been refining a physical model used to predict the winning time for each stage of the Tour de France. Our model is based upon a series of incline planes and incorporates real stage data and …
View article: Parametric Study of Simulated Tennis Shoe Treads
Parametric Study of Simulated Tennis Shoe Treads Open
We report on friction properties between simulated tennis shoe treads created in house and a hard court tennis surface approved by the International Tennis Federation. To simulate tennis shoe tread, we use the compound N70 Nitrile Butadien…