How to make a water bottle launcher out of pieces of pvc. Can shoot Very long distances. What you need is: About 2 feet of 1/2 inch piping, two 1/2 inch threaded to 3/4 inch corners, two 1/2 inch threaded joiners, 2 feet of 3/4 piping, a 3/4 inch end cap, a popped bycicle tube, and a 1/2 inch threaded ball release valve thing. Tools you will need are, a drill, and pipe glue. Optional parts are, a soda can for a blast deflector. If all that just confused you, just look at the picture.
Step 1: The End Cap
This is important to make carefully because you do not want any leaks here. What you do is cut the plug piece out of the bike tube. Then drill a hole in the end cap that is just smaller than the tube piece. then use some kind of glue (I Used Loctite extreme repair)and put it on the tube piece. then hammer it into the hole you made on the end cap.
Step 2: Making the Air Chamber
Once your end cap is dried, use pipe glue to glue it to one end of the 3/4 inch pipe. then glue the 3/4 inch to 1/2 inch threaded corner to the other end and there's the air chamber.
Step 3: The Air Release System
To make the air release system, screw one of the 1/2 inch threaded joiners into the corner piece of the air chamber. then screw the ball valve onto the other side and put the second 1/2 inch threaded joiner on the other side
Step 4: The Barrel
All you have to do for the Barrel is glue the 1/2 threaded to 1/2 corner piece on and your done.
Step 5: Optional Blast Deflector
The blast deflector is easy to make and keeps you from getting wet. all you do is cut the bottom end of a soda can off and cut a hole in the middle of it.
Step 6: The Rocket
any water bottle will work on the launcher. You can be creative with the fins and such.
Step 7: Shootin Your RPB (Rocket Propelled Bottle)
To fill the air tank, first make sure the valve is closed. fill with a pump or air compressor by using the bike pump part on the end cap. Just as if you were filling a bike tire. I think the highest i've filled was 150 psi with a bike pump. You can then remove the pump or air source. fill the rocket half way with water and slide fully onto the barrel. You may want to wrap a piece of electrical tape around the barrel about one time where the lip of the bottle is when loaded so that all the pressure can release before the bottle shoots off. then just aim and spin the valve to fire.