What did I make?
Well, I made a HPPL(High Preesure Projectile Launcher) all that is required to operate it is a bike pump a steady hand and some safety instructions. Pump up the barrel to about 20-40 psi, aim, and fire. With easy-to-obtain materials and a little hard work you to can fire anything that can fit in the barrel.

How did I make it?
I started off by drawing up a blue print on several sheets of graph paper and got to work. I consulted with my neighbor about the plausibleness of the build, since i know close to nothing the mathamatics required to build it. $50 later I had my parts and glues and was ready to build, when I discoverd the contest and took many photos in the process of building it.

Where did I make it?
At my house and my neighbor's house(He's a mechanic so he has every tool known to man)

What did I learn?
I learned that pressurizing and containing air is very hard from my viewpiont. The biggest challenge was finding a way to release all air at once. Some surprizes was the outstanding amount of teaking that had to be done in order to accomplish a working machine. If i had to do it again I would glue to gether all the parts with JB weld the first time and let it dry.

Step 1: Obtain the Materials

The supplies you will need are as follows.
1) 4in PVC end cap
2) 1 ft of 4in PVC pipe
3) 4'' to 2'' PVC connector
4) 2'' to 1'' PVC connector
5) 6'' of 1'' PVC pipe
6) 1 ft of 1'' PVC pipe
7) 2 1'' screw in connectors
8) 1'' Brass case steel ball quarter turn valve
9) Screw in Presta Valve(bike valve)
10) Screw in psi gauge
11) 6'' of 3/4'' PVC pipe
12) A tube of E6000
13) JB weld two part epoxy
14) PVC wet glue
<p>Danger: See link: This is not spam, but a warning. PVC will fail suddenly after a while. This was band member that hurt badly by a T-Shirt launcher explosion.</p><p>See the pictures and never use PVC to hold air, Please.</p><p><a href="https://fundrazr.com/campaigns/1Zs3c" rel="nofollow">https://fundrazr.com/campaigns/1Zs3c</a><br>..</p>
Not to be mean: but 20-40psi isnt high pressure <br> <br>a launcher I made goes up to 400 psi https://www.instructables.com/id/Co-Axial-Pneumatic-BB-Gun/ <br> <br>But still a cool project!
Cool project! I wish I had a cool neighbor with tools when I was growing up. <br /> <br />Thanks for sharing! <br /> <br />GM

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