A study on release conditions of JaveBall in the javelic ball throw

Abstract

This study investigated relation between the initial release conditions of a JaveBall in the javelic ball throw and flight distance. In 160 trials by 17 participants, the flight distance of the JaveBall was measured and its initial release conditions were calculated and analyzed. As a result, it was found that initial velocity had the strongest effect on flight distance. Release angle, angle of attack, and horizontal angle of attack at release also affected flight distance, but it was not greatly affected by large increases in these values. Also, increased initial velocity decreased the actual flight distance relative to the theoretical flight distance (neglecting the effects of air). Flight distance was large when the rotational speed at release was somewhat large or very low, suggesting that the effects on flight distance were different in each case.