Build a DIY Potato Cannon: PVC Spud Gun Instructions

PDF download Download Article
Launch potatoes into the next dimension with this simple guide
PDF download Download Article

You may love to eat potatoes, but firing them out of a massive cannon is way more exhilarating. Building a potato gun (also known as a spudzooka, potato cannon, or spud gun) makes for a fun DIY project that also demonstrates a few laws of physics along the way. In this article, we’ll break down everything you need to do to construct a basic potato gun. Feel free to put your own spin on the design, though! Follow along with us to construct your own spud gun in no time.

Building a DIY Potato Gun

  • Assemble your potato gun using a 3 in (7.6 cm) wide PVC pipe (14 inches (36 cm) long) as the main chamber.
  • Attach a 4 ft (1.2 m) long 1.5 in (3.8 cm) wide PVC pipe to the chamber using a coupler and reducer to form the barrel.
  • Install a spark generator or BBQ ignition switch to the chamber to make the trigger.
  • Potato guns are dangerous. Never fire a potato at a person and stay clear of the muzzle when you’re igniting the gun.
Part 1
Part 1 of 4:

Buying and Cutting the Pieces

PDF download Download Article
  1. Purchase the PVC pipes and glue you need for assembly. All the parts necessary for this project can be bought at your local hardware store if you don’t already have them at home. Some hardware stores may even cut the PVC pipe you’ll need for this project to length as a free service or for a minor fee. [1]
    • You need a 3 in (7.6 cm) wide PVC pipe that's 14 inches (36 cm) long and a 1.5 in (3.8 cm) PVC pipe that is 4 feet (1.2 m) long.
    • Only use schedule 40-80 PVC pipe. Schedule refers to the thickness of the pipe's walls. Pipe thinner than schedule 40 will be unsafe and could burst under high pressure. [2]
    • This build will create a potato gun that fires 1.5 in (3.8 cm) baby potatoes. If you want to craft a huge potato cannon that fires russets and Yukon golds, go up at 1–1.5 in (2.5–3.8 cm) for each PVC pipe you use (i.e. use a 3 in (7.6 cm) barrel instead of a 1.5 in (3.8 cm) barrel).
  2. Measure and mark your PVC pieces for cuts, if necessary. If you didn’t ask the hardware store to cut the PVC pipes for you, measure and mark the cuts yourself. Use a felt tipped marker to mark the PVC at the following lengths so they’re ready to be cut: [3]
    • 3 in (7.6 cm) wide PVC marked at least 14 inches (36 cm) in length. This will be your ignition chamber.
    • 1.5 in (3.8 cm) wide PVC marked at least 4 feet (1.2 m) in length. This is going to be the barrel.
    Advertisement
  3. Cut the PVC pipes along the marks you made using a hacksaw . Clamp the pipes down to a work bench or have someone hold the pipe on a flat surface as you saw. The cuts don’t need to be perfect. Use a hacksaw to trim your PVC to size. Once you’re finished, remove plastic burrs by rubbing the cut edges with a medium-grit sandpaper . [4]
    • If you don’t have a hacksaw, you can use a PVC pipe cutter , handsaw, or miter saw.
    • If you don’t have sandpaper, you can clean up the burrs at the cut edges using a utility knife.
  4. Grit or plastic shavings from cutting the PVC can negatively impact the seal of parts when fitted together. Take a clean rag and wipe all parts of the PVC clean. If there are a lot of shavings, use a vacuum cleaner. [5]
    5. Advertisement
Part 2
Part 2 of 4:

Assembling the Launcher

PDF download Download Article
  1. Spread PVC glue around the outside of your main chamber at one end using the applicator on the glue or cement lid. Twist a 3 in (7.6 cm) PVC female adapter over the area you glued. Then, screw a PVC plug into the adapter. [6]
    • When you glue the PVC pieces together, hold them together firmly for at least 60 seconds so the glue bonds.
    • Twist each glue joint a quarter-turn as you are pushing it together. This will encourage a better seal.
    • Whenever you apply PVC glue or cement, use a clean towel to wipe away any excess glue.
    • The section you’re assembling will be the very back of the launcher.
  2. Apply PVC glue around the outer lip of the segment and the inner lip of the PVC coupler. Slide the coupler into place on the end of segment with nothing attached to it yet. [7]
    • Just to clarify, this is the end that’s opposite to the end you just plugged up.
  3. Glue the 1.5 in (3.8 cm) reducer in the coupler. Apply more PVC cement to the inner lip of the coupler and the outer section of the reducer (only on the big portion). Slide the reducer into coupler until the collar of the reducer meets the end of the coupler. [8]
    • You should feel the end of the reducer pressing against the coupler.
  4. Spread the PVC glue around the inner lip of the reducer and the outer lip thin barrel on one end. Slide the barrel into the reducer until it is roughly even with the base of the coupler. [9]
    • This might look kind of silly since the barrel is 4 ft (1.2 m) long. You need a really long barrel to maximize the velocity of your spuds, though!
  5. If you use your potato launcher before the PVC glue has enough time to harden, the launcher may fall apart when you pull the ignition. Explosive force in the combustion chamber puts stress on the PVC, so the glue must be completely and totally dry. [10]
    • You can keep working and add the spark generator or ignition in 2-3 hours, just don’t fire the gun right away.
    6. Advertisement
Part 3
Part 3 of 4:

Adding a Spark Generator

PDF download Download Article
  1. You can use a spark generator or a BBQ ignition switch for the ignition mechanism. Basically, these devices create an electrical arc when you press a button. Use a drill and pilot bits to drive holes into the back 1/3 of your 3 in (7.6 cm) chamber near the plug. The holes must be large enough to fit the sparking components of your generator, but not so big they slide around inside the chamber. [11]
    • You can buy a spark generator or BBQ ignition online or at a local hardware store.
    • Most generators may have two prongs, or a single double-pronged extension.
    • Many generators require spark-emitting prongs to be within 2 ⁄ 5 inch (1.0 cm) of each other.
    • Alternative: If you don’t want to mess around with an electrical switch, drill a hole in the chamber big enough for a long lighter. You can manually light each shot this way if you prefer.
  2. Insert the spark generator and attach it with electrical tape . Carefully slide the spark-emitting portion of the generator or switch into the holes you’ve drilled. Use electrical tape to pin the cable in the opening so it hangs in the center of the chamber. Then, hook the leads from the spark generator up to the trigger (if necessary). [12]
    • Do not use duct tape. Duct tape is conductive and may catch on fire. Only use electrical tape for this. You can use electrical putty instead of electrical tape if you prefer.
    • Connect positive leads (+) to positive terminals on the generator and negative leads ( - ) to the negative terminals if they aren’t already pre-wired.
    • Once the leads and terminals are attached, prevent accidental shocks by covering any bare wiring or components with electrical tape.
    • Check your spark generator by unscrewing the PVC plug from the female adapter. While looking inside the combustion chamber, press the generator trigger several times. If you see a spark, it works.
  3. You can place the switch itself wherever you’d like so long as it doesn’t pull on the wiring. Once you find a comfortable location for the trigger, tightly wrap it to the chamber with electrical tape or glue it in place. [13]
    • Where you put the switch should be informed by how you plan on holding the potato gun. Most users either:
      • Mount the gun on their dominant shoulder to make aiming easier.
      • Hold the gun against their hip to minimize kickback.
      • Take a knee and brace the gun against the ground or their knee.
    4. Advertisement
Part 4
Part 4 of 4:

Firing the Launcher

PDF download Download Article
  1. Press a spud into the barrel end of the launcher so it fits snugly and push it down a few inches. You can also use a stick to push it further down. Then, unscrew the cap that’s plugging up the female adaptor at the back of the chamber. [14]
    • If you keep dropping potatoes into the chamber, drive a small screw into the base of the barrel. This will keep potatoes from falling into the chamber.
  2. Almost all hairspray will work as a propellant for your launcher. Spray the hairspray into the chamber for about 4-7 seconds and your launcher is “loaded” and ready to go. Screw the plug quickly and take aim. [15]
    • Too much propellant is as bad as not enough. If there’s not enough oxygen, ignition will not occur. Use trial and error to determine how much propellant is right for you.
  3. It may take a few clicks of the trigger before the spark ignites, but when it does the hairspray will ignite. This will force the potato out the barrel of the launcher. Now it’s time for target practice! [16]
    • Always operate your potato launcher with caution. Improper or reckless usage could cause harm or property damage.
    • You can seriously maim or injure someone with your potato gun. It’s just as dangerous as a real weapon, so don’t treat it like a toy. [17]
    4. Advertisement

Community Q&A

Search
Add New Question
  • Question
    Can I use gasoline instead of hairspray?
    wikiHow Staff Editor
    Staff Answer
    This answer was written by one of our trained team of researchers who validated it for accuracy and comprehensiveness.
    wikiHow Staff Editor
    Staff Answer
    No. You'll blow the gun up and start a fire. It's not safe to use a liquid accelerant like gas.
    Thanks! We're glad this was helpful.
    Thank you for your feedback.
    If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow
    Yes No
    Not Helpful 23 Helpful 70
  • Question
    Can the potato cannon overheat? if the potato gun can overheat, what can I use to cool it down?
    wikiHow Staff Editor
    Staff Answer
    This answer was written by one of our trained team of researchers who validated it for accuracy and comprehensiveness.
    wikiHow Staff Editor
    Staff Answer
    The answer is probably yes, the potato gun can likely overheat. However, it's unclear just how quickly you'd need to fire the weapon to cause it to overheat. It's surely not a common issue in the potato gun community. If you feel the PVC pipe getting hot, just set the gun down on a heat-resistant surface and wait for it to cool off.
    Thanks! We're glad this was helpful.
    Thank you for your feedback.
    If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow
    Yes No
    Not Helpful 9 Helpful 37
  • Question
    Can a potato gun be used for water balloons?
    wikiHow Staff Editor
    Staff Answer
    This answer was written by one of our trained team of researchers who validated it for accuracy and comprehensiveness.
    wikiHow Staff Editor
    Staff Answer
    No. The amount of force a potato gun generates is not trivial. Potato guns can easily fire a spud up to 650 feet (200 meters). That kind of combustion will eviscerate a water balloon in the barrel. Use a slingshot for water ballons!
    Thanks! We're glad this was helpful.
    Thank you for your feedback.
    If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow
    Yes No
    Not Helpful 10 Helpful 37
See more answers
Ask a Question
200 characters left
Include your email address to get a message when this question is answered.
Submit
      Advertisement

      Tips

      Submit a Tip
      All tip submissions are carefully reviewed before being published
      Name
      Please provide your name and last initial
      Submit
      Thanks for submitting a tip for review!

      Warnings

      • It’s very important that you let the glue dry before firing your launcher. Most accidents with these guns happen because an anxious builder does not let the glue dry. Let it dry a full 24 hours before shooting.
        Thanks
        Helpful 0 Not Helpful 0
      • Make sure you glue every single fitting. If you don't, the gun will fly apart when you fire it and you risk serious injury.
        Thanks
        Helpful 0 Not Helpful 0
      • Never look down the barrel of the cannon or pointing it at someone when it's loaded.
        Thanks
        Helpful 0 Not Helpful 0
      Advertisement

      Things You'll Need

      You Might Also Like

      How to
      Thread Pipe
      How to
      Make a Match Rocket
      How to
      Calculate Escape Velocity
      How to
      Build a Trebuchet
      How to
      Turn Your Hand Into a Rubber Band Gun
      How to
      Build a Pen Gun
      How to
      Build a Strong Catapult
      How to
      Build a Basic Catapult
      How to
      Make a Toy Gun
      How to
      Modify a Nerf Gun
      How to
      Make a Rubber Band Gun
      How to
      Fire a Rubber Band
      How to
      Make a Sling Shot
      How to
      Make a Paper Gun That Shoots
      Advertisement

      References

      1. ↑ https://cpb-us-e1.wpmucdn.com/sites.psu.edu/dist/0/3445/files/2013/04/How-to-build-a-Potato-Cannon.pdf
      2. ↑ https://www.burntlatke.com/safety.html
      3. ↑ https://cpb-us-e1.wpmucdn.com/sites.psu.edu/dist/0/3445/files/2013/04/How-to-build-a-Potato-Cannon.pdf
      4. ↑ https://www.bobvila.com/articles/cutting-pvc-pipe/
      5. ↑ https://cpb-us-e1.wpmucdn.com/sites.psu.edu/dist/0/3445/files/2013/04/How-to-build-a-Potato-Cannon.pdf
      6. ↑ https://cpb-us-e1.wpmucdn.com/sites.psu.edu/dist/0/3445/files/2013/04/How-to-build-a-Potato-Cannon.pdf
      7. ↑ https://cpb-us-e1.wpmucdn.com/sites.psu.edu/dist/0/3445/files/2013/04/How-to-build-a-Potato-Cannon.pdf
      8. ↑ https://cpb-us-e1.wpmucdn.com/sites.psu.edu/dist/0/3445/files/2013/04/How-to-build-a-Potato-Cannon.pdf
      9. ↑ https://cpb-us-e1.wpmucdn.com/sites.psu.edu/dist/0/3445/files/2013/04/How-to-build-a-Potato-Cannon.pdf
      1. ↑ https://www.bobvila.com/articles/gluing-pvc-pipe/
      2. ↑ https://cpb-us-e1.wpmucdn.com/sites.psu.edu/dist/0/3445/files/2013/04/How-to-build-a-Potato-Cannon.pdf
      3. ↑ https://cpb-us-e1.wpmucdn.com/sites.psu.edu/dist/0/3445/files/2013/04/How-to-build-a-Potato-Cannon.pdf
      4. ↑ https://cpb-us-e1.wpmucdn.com/sites.psu.edu/dist/0/3445/files/2013/04/How-to-build-a-Potato-Cannon.pdf
      5. ↑ https://cpb-us-e1.wpmucdn.com/sites.psu.edu/dist/0/3445/files/2013/04/How-to-build-a-Potato-Cannon.pdf
      6. ↑ https://cpb-us-e1.wpmucdn.com/sites.psu.edu/dist/0/3445/files/2013/04/How-to-build-a-Potato-Cannon.pdf
      7. ↑ https://cpb-us-e1.wpmucdn.com/sites.psu.edu/dist/0/3445/files/2013/04/How-to-build-a-Potato-Cannon.pdf
      8. ↑ https://www.chicagotribune.com/news/ct-xpm-2013-04-27-ct-met-potato-guns-20130427-story.html

      About This Article

      Article Summary X

      To make a potato gun, cut a PVC pipe so that it's 4 inches wide and 2 feet long, and another pipe so that it's 2 inches wide and 5 feet long. Next, glue a female adapter to 1 end of the 4 inch pipe and a coupler to the other end as you prepare the launcher. Continue to assemble the PVC pipes to form the combustion chamber and barrel. Then, drill holes in the combustion chamber for your spark generator, which should have electrical tape covering it to prevent shocks. To learn how to spray propellant into the combustion chamber to launch your spud, keep reading!

      Did this summary help you?
      In other languages
      Thanks to all authors for creating a page that has been read 1,126,875 times.

      Reader Success Stories

      • Micheal AH

        Jul 22, 2022

        "We did this project for our school expo , it was just mindblowing, our team did a few modifications like adding a ..." more
        Rated this article:
      More reader stories Hide reader stories
      Share your story
      If you buy through links on our site, we may earn a commission .

      Did this article help you?

      Advertisement