My golf/tennis ball cannon | AnandTech Forums: Technology, Hardware, Software, and Deals
Compressed Air Tennis Ball Mortar : 7 Steps - Instructables
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Tennis Ball CANNON from Soup Cans | Today we're building a super simple tennis ball cannon that can pack a massive punch! We might've lost some tennis balls in the testing process...
How to Make a Tennis Ball Mortar: 12 Steps (with Pictures)
Tennis Ball Launcher /Mapp Gas Fueled Cannon - YouTube
How to Make a Tennis Ball Mortar: 12 Steps (with Pictures)