Labor Day Weekend Water Gun Spectacular

In the US, summer is marked by two holidays. In late May, Memorial day traditionally marks the the beginning of summer, the opening of public pools, and the day shopping malls are invaded by scores of petulant teenagers. In early September, Labor day marks the traditional end of summer, a great weekend to fire up the grill, and finally – finally – an end to the neighborhood kids screaming their heads off outside. Being Labor day weekend, we were very happy to see two builds show up in the tip jar concerning the one object that defines summer: water guns.

Homemade Super Soaker

[Michael] had the genius idea of building a water gun out of a diaphragm expansion tank (German, here’s the terrible translation). These tanks – usually connected to a house’s hot water line near the hot water heater – allow for the expansion of hot water and protects pipes from excessive pressure. It does this with a rubber membrane separating the inside the tank into two halves. Half the tank is filled with water while the other half is filled with compressed air from a bicycle pump.

[Michael] connected a hose and made a nice gun out of aluminum pipe to build the ‘gun’ part of his build. With 9 bar of pressure in the expansion tank, [Michael] can shoot a stream of water 20 meters.

Water gun turret with a laser sight

This build comes from [Valentin]. He picked up a automobile water pump for just a few Euros, and attached it to a 1 liter bottle filled with water. A pan/tilt turret was constructed out of CNC milled aluminum and a pair of servos.

After [Valentin] got the water-shooting turret part of the build out of the way, he installed a 2.4 GHz wireless camera on the pan/tilt mount and taped a receiver to the back of his remote control.

The addition of a small LCD screen displaying the turret’s point of view makes for a very cool build, perfect for pestering those annoying neighborhood kids.

Video of [Valentin]’s build after the break.


4 thoughts on “Labor Day Weekend Water Gun Spectacular

  1. I openned hackaday and I saw a water gun and read it’s german… lol germans and water gun my first thought was -> ‘ze kreutz are secretly building a flammenwerfer!!’

    then I got to the article and what I see ?? a freaking flamethrower

    and I am like “OMG fckin god!!!!”

  2. “diaphragm expansion tank” probably should be translated “hydraulic accumulator” – many uses in hydraulic systems – the equivalent function in electronics is a capacitor….

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