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MAKE subscriber Ross sent us info on this rather powerful pneumatic ping-pong ball gun, built by Ron Kessinger and presented at Denver's Club Workshop -
You can think of this as a variation on a potato cannon, however his is built to run on compressed air, and it runs on much tighter tolerances.
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It runs off of a compressed air line and a standard wall outlet. After firing a few "dry" rounds, he proceeded to shoot off a few (ok a LOT) of ping pong balls filled with water. These things might not weight a lot, but they are moving FAST. A sheet of drywall was no match for them, and even particle board failed spectacularly when faced by a 1" sphere of water.
Dang! That'd make for one rough game of table tennis … a very short game as well - eep! =( For more pics, vids, and info, head over to the TINYenormous blog
Believe me when I tell you that place was a royal mess to clean up the next morning!
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we made one for the physics department at my undergrad that worked on vacuum... you sealed off the ends of a tube with tape and pumped the air out... then cut the opposite end you wanted the ball to come out of. without water in the balls it could go clean through several pop cans.
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