The Average Height Of A Baseball Fly Ball

Catching and judging the trajectory of a fly ball is a routine play for most experienced baseball players. Though this is true for the majority of fly balls, those that go higher or lower than expected may present difficulties for a fielder due to having a different trajectory. As such, knowing the average height of a fly ball may help you to estimate when fielding a fly ball may not be a routine play.

Factors Affecting Trajectory of a Fly Ball

According to Robert Israel of the University of British Columbia, a number of factors combine to determine the trajectory of a fly ball. These factors include the speed at which the ball is traveling, the shape and smoothness of the ball, the amount of time that the ball remains in the air, air resistance and wind. With the effect of air resistance increasing dramatically with faster-traveling balls, the speed leading to a very high fly ball may greatly affect its trajectory.

Average Height of a Pop Fly

According to measurements compiled by Michael Avigliano, including those of Israel, the average height of a pop fly hit by an adult ranges from 125 to 195 feet. However, as Israel's estimate is much higher than the others, the average height of a pop fly may be better represented by the lower range of these estimates. As such, the average height of a pop fly could be 125 to 150 feet.

Highest Pop Fly

According to the estimates compiled by Avigliano, the highest fly ball ever recorded reached a maximum height of more than 560 feet. Hit by the Boston Red Sox's Ted Williams in 1941, the height of this fly ball may be a product of a special combination of the factors mentioned above. In addition to the force with which it was hit and environmental factors, Jim Kaat, a former major league pitcher writing for Popular Mechanics magazine, points out that the older ball had a different composition and rougher surface than the one currently used. As pointed out by Israel, a rougher surface decreases a ball's critical speed, thus lowering the effect of turbulence and allowing the ball to travel higher and farther.

Difficulties with Pop Flies

As pointed out in a 2008 study by Michael McBeath of Arizona State University and his colleagues, the approximate maximum height of a pop fly hit by a minor league baseball player is 50 feet. While adults may occasionally hit pop flies to such relatively low heights, these authors acknowledge that the average pop fly hit by a major league player exceeds 120 feet. Given the findings of these authors and the effect of wind resistance pointed out by Israel, the average major league pop fly does not follow as predictable a trajectory as that of a minor league player. As McBeath and colleagues point out, this may explain why apparently routine pop flies often present difficulties for professional baseball players and those making the transition from the minor to major leagues.