Picture of Pneumatic Golfball Cannon- Shoots 450+ yards!

Youtube Channel:

EDIT: 23/05/2010 - I've updated two photos of the cannon. I've removed the stock because it was unnecessary and I only put it on there to help with my school assignment. Removing it wont effect performance and sheds weight.

Youtube Channel:

Versatile Antenna Launcher is a cannon I made for a school assignment. I was required to build a cannon that could shoot a pocket nerf with a fishing line attached over a tree. Since it was going to cost me a fair amount of cash I decided to make it over-kill with a 2" piston valve.

Spudfiles topic:,p,186844.html#186844

I also made a golfball barrel for it as well. This cannon will launch a golfball over 450 yards at only 115psi. At 60psi it will launch a nerf over 120m. This is a very powerful cannon and must be treated with respect as if it was a real firearm.

In this How-To I will teach you how to build one of your own cannons and how everything works so you understand what you are doing. It doesn't have to be exactly the same as mine, you can change it up a bit. Just be creative.


Chamber: About 5' of 2" pressure rated PVC pipe and fittings.
Barrel: 3' long 2" barrel or a 5' long golfball barrel (1.5" SDR 21 PVC)
Main Valve: 2" Piston valve, 1.5" seat (what the piston seals against)
Pilot Valve (What triggers the cannon): 1" modded sprinkler valve
Fill Valve (where you fill the cannon up with air): 1/4" brass Quick-Connect
Pressure Gauge: 0-300PSI
Operating Pressure: 20-120PSI
Weight: 14 pounds
Velocity: Golfball - 200ms (650fps)
Distance: Golfball - 420m+ (450+ yards)

I do not take any responsibility for your actions if you choose to follow this How-To. This is meant only for a learning purpose so you can understand how these work and what it takes to build one. If any thing goes wrong it is your own fault and I cannot be held liable. By reading this How-To you accept to my terms and conditions of this disclaimer. Treat this as a real firearm, it has more then enough power to kill, never point this cannon at a living person or animal even if it isn't loaded or pressurized. Do not destroy public or private property. Never take this cannon off your own property and only fire it when you know what you are shooting at, you have a good backstop and know that there are no people around. Keep it safe.

The cannon can also be seen here at SpudFiles:
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Great instructable! Quick question, what do you think would be the easiest way to modify this to make it shoot tennis balls? I would assume switching the barrel but with your breech loading not sure how to go about doing that.... Thx

nvm just figured it out haha

BuckmasterAR4 months ago

another question......if I want to make it a muzzle loaded cannon, can I get a way with not buying:

2 x 50mm pressure rated PVC male threaded spigot fitting (2")

1 x 50mm pressure rated PVC coupler (2")
1 x 40mm pressure rated PVC coupler (1.5")

BuckmasterAR4 months ago

when you say "The sprinkler valve will be used as the pilot valve for the piston. You could get away with a 1/2" ball valve instead but this will give you more power."....I don't understand, you have both on your cannon in all of the pictures of the finished cannon...could you make sense of this for me....which do I use, or do I use both of them.?????

MrCrowley (author)  BuckmasterAR4 months ago
The ball valve (on the left) is only 1/4" and is used to control the filling of the cannon with pressure. You connect the pump, open the 1/4" valve, fill the cannon, close the valve, disconnect the pump.

The sprinkler valve on the right is 1" and is the pilot valve.

but could I use both as it is shown, just to keep accuracy and consistency? and can you please reply to my first comment about changing the size since I am trying to make it shoot baseballs and tennis balls

MrCrowley (author)  BuckmasterAR4 months ago

I don't understand what you mean, neither valve has anything directly to do with accuracy. Build it as shown, use the SPRINKLER VALVE to FIRE the gun, use the BALL VALVE to OPEN/CLOSE the quick connect fitting.

If you don't want to use the sprinkler valve, replace it with a 1/2" ball valve. The 1/2" ball valve already on the cannon is not suitable because the brass quick connect fitting drastically limits flow.

Yeah you just have to change the barrel. You could make the tee fitting/valve larger but this guide won't be able to help you much with that. The tee fitting has a 2" threaded female adapter, just get a 2.5" barrel (or whatever fits baseballs/tennis balls) and add a 2" threaded male adapter to the end.

I didn't mean accuracy with the shooting aspect of it, I was talking about the accuracy of constructing it in relation to yours, that's all

MrCrowley (author)  BuckmasterAR4 months ago
Sorry, you're right that the ball valve on the left is 1/2" (I later replaced it with a 1/4" one). Anyway, the quick connect fitting (the gold brass fitting on the end) is only about 6mm in diameter and would severely reduce the flow through the ball valve meaning it wouldn't be appropriate as a pilot valve.
BuckmasterAR4 months ago

I'm making it for a school project. I need to change it from the size of a golf ball to the size of a baseball or tennis ball. Could I get away with just changing the barrel diameter to fit a baseball or tennis ball, and change the Tee fitting up towards the muzzle, and other necessary parts up towards the breech/ chamber.

-CCCP-8 months ago

If you use PVC, make it all PVC. The iron parts just are a waste.

MrCrowley (author)  -CCCP-8 months ago

If you can find a PVC like that unique galv. iron 3-way, let me know. I can't find many small threaded PVC fittings (elbows, tees, etc) here and I already had the iron fittings. Plus, they're in a somewhat structurally important area where there is some leverage on the fittings when being held at the valve.

-CCCP- MrCrowley8 months ago

Any PVC fittings, including that uniuqe 3 way, (even uniuqe 5 ways!) can be found here:

They also have Clear PVC and SCH 80. SCH 80 is stronger and safer, and Clear looks really cool.

MrCrowley (author)  -CCCP-8 months ago

Doesn't look like they ship overseas and there's a minimum order of $25.

I would consider making the pilot area out of HDPE over PVC. In fact, I believe the 50mm x 25mm bushing is HDPE if I recall correctly. HDPE would be much better suited for the pilot area because it is less brittle than PVC. It's relatively easy to snap the threads on small diameter PVC fittings and I couldn't risk that in an area that will be under a fair amount of stress during firing.

xman96001 year ago

hi can I buy all they's parts at home depot in America and how do u do the conversion

erniehatt1 year ago
Not sure if this is still open.
When the piston is retracted what gap should there be from the back of the piston to the barrel, I am thinking 8 mm is this enough.?
tictaclad3 years ago
ok i am extremely confused...why is it that your pumping air into the valve and the piston area? shouldnt you be pumping air into the chamber? and why is one of the openings to the sprinkler valve not attached to anything? sorry for all the questions im just confused
MrCrowley (author)  tictaclad3 years ago
1) You need air behind the piston to force the piston against the barrel. Once that happens, air moves around the piston and fills the chamber.
2) Because it vents the air from the pilot out in to the atmosphere
ohh ok i get it...but why would i do this if i could just make a cannon that goes
chamber-ball valve-barrel
and just release the ball valve to fire?
yes but a piston valve is significantly faster at opening than a ball valve getting a very noticeable in force and distance
This is a crude, first draft I came up with that might work. Im going to do further designs in 3D to see how it looks with correct specs for actual use in a potato gun.
plywood piston design.png
Gosh, that's LETHAL!
benduy3 years ago
u a kiwi? same here
MrCrowley (author)  benduy3 years ago
Yeah mate.

You made any cannons or such? Where abouts do you live? I'm in Auckland myself.
yea i made a potatoe cannon and ended up with no eybrows, yea im from dunedin, i found a guy from chch too. i made a mini cap gun and modded out with a peizo clicker and redbull shot! BOOM NO EYElashes, dont put lighter fuel in a cannon then look down teh barrel!!!!!!
i did the exact same thing (no eyebrows) like 2 years ago and people still talk about it!! good times lol
It sucks ahe! Mine got kinda glued together, mum threw the gun out cos she suqs it was a weapon cabable of harm, my little finger!
haha nice yes that too my eyelashes melted together so opening my eyes was mom didnt find out until like a year later lol
benduy3 years ago
now dats a hole puncher!
Fragite3 years ago
I'm American, and I can't seem to find any of the 1.5" SDR 21 PVC on any website or store. The site you linked is broken and my antivirus software blocks a trojan whenever I go to that URL. Can you help?
much thanks,
Fragite Fragite3 years ago
Nevermind, has it.

Great tutorial, BTW
cafesua4 years ago
hi, would someone make me a golf ball cannon? i would like to have one to get rid of wild critters around my house. how much would it cost me. thank you
Mattrox4 years ago
Just wondering where you got your pressure gauge from?
Pizzapie5004 years ago
I'm going to post a vid on how to do this b/c it seems a lot of people have issues. (Actually I already made it, I just didn't post it.) Also Sprinkler Valves are only meant to go to 90 PSI. Well, at least, mine says that on the box. Lastly, do you have any problems with threaded parts? I wrapped mine in 4 layers of teflon tape and it still leaks. I heard that you should use gas teflon tape, but i'm using the regular ones that come in a blue thing.
MrCrowley (author)  Pizzapie5004 years ago
Mine says 125PSI but it doesn't matter anyway, they're probably good to 200PSI. Blowguns are only rated for 90PSI but can be good to 700PSI.

I only have problems with brass threaded fittings, just wrap them in more layers and insure the threads are clean. The gas teflon is just normal stuff but thicker pretty much.
Oh whoops. You're right! I meant that my blowguns are only rated at 90 PSI. Also should I get gas teflon tape? It's sort of expensive considering that regular teflon is 30 cents and gas teflon is $3.50
Pizzapie5004 years ago
You can buy a pipe cleaner liquid instead of using mthylated spirits
eshimek4 years ago
Using this design, would I be able to consistently shoot a golfball around 30 m/s? I need to design one, but don't require much power, just consistency around 30 m/s. Do you have any suggestions?
MrCrowley (author)  eshimek4 years ago
Only 30m/s? May as well just use a 1" sprinkler valve (the pilot valve from this cannon).

Would make things more consistant than a averagely constructed piston valve.
Easier to build, cheap, easier to maintain. Go with a 1" sprinkler valve in my opinion.
Pizzapie5004 years ago
WOAH! Maybe you should make a list for Americans and a list for other people (aka metric and not metric).
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