Instructables
Picture of Home-made potato gun
How to make a potato gun with easy to get materials (just fires a small piece of potato, not a whole one)
 
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Step 1: Materials

You will need:
- A syringe
- A small, hollow metal tube (one can be found in a Staples RE-VU pen)
- A potato
- A 3cm piece of chopstick or wood of a similar size
- A pair of hands
- Scissors
- Electrical tape

Step 3: Strenthen the barrel

Attach the piece of chopstick to the end of the syringe and the metal tube.  Make sure to use enough tape so that is very strong. p.s. in the image part of the chopstick is exposed. Make sure to wrap tape on the whole chopstick piece.

Step 4: Shoot your potato gun

Pull the plunger of the syringe to maximum length without disconnecting the two pieces. Hold the barrel about a cm away from the open end.  Stab the end into the potato a cm deep. Twist the barrel inside the potato so that the piece breaks off. Pull the barrel out of the potato and point at whatever you want to shoot at.  Push the plunger down very quickly and dont stop until it reaches the end. The air pressure will force the piece of potato out at a very high speed and make a satifying *CRACKK*. 
billbobby4 years ago
 can you use a hollowed out pen tube instead of a metal rod?
stuntkid223 (author)  billbobby4 years ago
you might be able to, but ive tried larger barrels (not neccesarly a pen tube), and it seems that there is just not enough air pressure to dispel the bit of potato with enough force
billbobby4 years ago
 dude nice i couldnt use a peizo sparker because i kept breaking them :P but your instructable is like the only one on the site that doesnt need actual propelant! good job.