My Homemade Water Rocket

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Wed May 27, 2015 4:01 pm

Very easy to make. You need a 500ml coke bottle, this particular drinking cap and Schrader valve attached to the bottom.

Fill the half of it with water and pressurize it to 5-6 bars. While you are pressurizing it, use your other hand to grip the cap since it cannot hold the pressure itself.

To launch it, just throw it in the air or release it like I did. Be careful not to get wet like me :D

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Sergeant Major 4
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Wed May 27, 2015 4:56 pm

Neat! I never though of using one of those caps like that before.

Needs flammable gases though. :D
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Thu May 28, 2015 4:57 pm

Hahaha nice work! The flammable gases suggestion is a good one.

Coincidentally, I've been experimenting with Coca Cola bottles too. I took a regular bottle cap, drilled a 5.5 mm hole in there, and threaded a presta valve with some teflon in it. Screwed the cap on a 1.5L bottle, pumped it up to 11(!) bar, and shot it with my air gun from some distance.

It so loud that my neighbours thought I'd blown up myself. Really recommend it. (not really)
At least it's fun to shoot at!

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Brian the brain
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Sat May 30, 2015 5:45 am

I've used a quick disconnect fitting in a similar way..
The narrow outlet seemed to benefit the rocket effect.
Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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