A STUDY TO INVESTIGATE THE RELIABILITY AND CONSISTENCY OF THE SPORTS TUTOR TENNIS CUBETM VELOCITY, TRAJECTORY AND LANDING POINTS

  • Michelle Norris
  • Sarah Breen,
  • Ross Anderson
  • Ian Kenny
Keywords: Ball machine, Speed, Tennis ball

Abstract

The purpose of this study was to investigate the reliability and consistency of the Sports Tutor Tennis CubeTM ball launcher. Five identical (mass, diameter) competition standard tennis balls were each launched twenty-five times and flight was assessed using 3D infra red motion analysis. 3D resultant velocity was found to be 18.9 ± 0.89 m/s, landing points had a coefficient of variation in the lateral direction of 8.28% and 18.4% in the vertical direction Trajectory was also projected to estimate ball carry showing ball flight range (horizontal spread) of 14.9 ± 3.71 m. Results showed that whilst the commercially popular tennis ball launcher was stroke specific, it exhibited a level of variability This could be seen to bring variance to tennis players’ practice that they once thought did not occur with the use of tennis ball machines.