Water rocket release

Hey friends.
I prepair a project from summer 2014 for public.

My intension was to do a complete set of water rocket launcher.
My test setting was proof up to 15 Bar/ 220 PSI which was my goal.
I tested with rockets sized from 0.5 liters up to 9 liters.

Please give comments.
I am open for special wishes and ideas.

Parts are tested an everithing works good but I want to do some additional features like guiding rails for a better start performance.

So this is work in