The EZ-Launch bottle rocket launcher has an internal spring loaded release mechanism. that allows the user to lock the 2 liter bottle in place during the fill up phase and release the bottle with ...

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 ...

Usually, this takes the form of a 2-liter bottle, a tire pump and some cardboard fins. [François Gissy] modified the design ... wrapped water tank. There wasn’t a throttle on this rocket ...