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Re: Check out our cannon bot!
 Very nice! We've got a compact tennis ball cannon mounted on (of all things) a Vex platform here. It's quite fun to shoot tennis balls down two buildings worth of hallways. The sprinkler valves come in quite handy and although they are spec'ed for 24V AC, they trigger perfectly fine with 3 9V batteries in series, perhaps through a spike relay for remote firing.
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MIT Mechanical Engineering
>> College Mentor, Team 97: Cambridge Rindge and Latin School with The Edgerton Center, MIT Mechanical Engineering, Bluefin Robotics, and Draper Laboratory
>> Alumnus, Team 527: Plainedge HS
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