In this video I'll show you how you can make a powerful blow gun for under $5!  As a bonus I'll show you how you can make some simple explosive darts!
<p>That's so cool</p>
1 1/2 inch or 1/2
I used 1/2 inch PVC pipe. Larger pipe can probably work but you will have to blow much harder to get the dart to go fast. A smaller tube should make the dart go much faster. Also, the longer your tube the faster the dart will go (to an extent). That's why my tube is 4 feet long instead of being shorter and easier to carry.