Pneumatic Potato Gun

I recently made a pneumatic potato gun. It is made out of PVC pipe and uses air pressure to throw potatoes. some days it works well but sometimes it decides not to work. The first time I used it today it worked but when I tried to video it it wouldn't go. when it works it works well though. here are some pictures of it. 

I am planing on putting bigger place to put the air. This was all I could afford at the time. I didn't follow any plans so it's not perfect.

Mom let me have some old potatoes to lanch.

The end of the barrel is sharpened so that the potatoes fit and not let the air go around them.

I use a broom handle to shove the potato into the barrel.

I use an air compressor to put air into this.

 This doesn't have anything  to do with the potato gun but I thought it was a good picture of Nathaniel.