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280kph Tennis Ball Cannon
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Down at the local cricket nets, facing tennis balls travelling up to 280kph.
DO NOT TRY THIS AT HOME. We were wearing protection and had safety measures in place. At 280kph, a tennis ball will have about 140 joules of energy and getting hit at 90PSI on the arm hurt a lot more than a cricket ball to the inner thigh.
Muzzle velocity at 120PSI is 450kph but the average velocity over 22 meters is 280kph as the tennis ball slows down significantly over the distance.
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