Easy to assemble metal water rocket launcher with a 125 PSI ... StratoLauncher IV Ultimate will propel a 2 liter plastic (PET) soda pop bottle over 350 ft. in the sky. Watch the last minute ...

This water rocket launcher lets you do just that ... If you’ve already got a compressor and some empty 2-liter bottles you might also pick up some extra PVC to make this pressurized water ...

This allowed [Zach] to test the geometry of the parts, operation of the mechanism, and how it interfaced with the flange on the necks of 2-liter soda bottles. Honestly, the prototype was pretty ...