Quote:
6.3.1 BALLS
While playing Breakaway, ROBOTS manipulate BALLS to accomplish the objectives of the game. Each BALL is a standard Size 5 soccer ball. The BALL weighs between 14 and 16 ounces, has a circumference of 27 to 28 inches, and is inflated to a standard pressure of approximately 9psi.
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let's see....28" / 2 pi = 4.45" so the spec ball radius could be pretty close to 4.5"
at least to within the accuracy that you can measure the position of the lower front corner of the bumper!