Soda Bottle Rocket Launcher

All Soda Bottle Rocket Launcher are either weak, dangerous or far more advanced--they use carbon fiber and epoxy sleeves, nozzles, thousands of psi from scuba tanks...
The rocket launcher I designed and built is for students.  It's designed so that no one ever need be near the launcher when it's pressurized, it can be safely depressurized if needed (hang fire) and it takes almost no force to launch. The first launcher I made was a stake in the ground that the force required to launch often pulled it off vertical until it was pointing in my direction.

This one works, is safe, not only launches students' rockets, it also uses multiple forms of leverage. Highest velocities so far >90m/s (200 mph)

Take a look: 

 

all diagrams and photos ©2011WNettles. If you need more information to build your own just ask.