Combustion Cannons

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Announcements

SpudFiles Potato Gun Commercial

Last post by quinn whitsitt
Replies: 15
by PCGUY » Tue Oct 29, 2013 10:54 pm
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I've been wanting to get in some spud shooting action this fall before the weather got cold. I know it's been a while since I filmed anything for...

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thank you for creating this website is there anything i can do to help
15 Replies

1217960 Views

Last post by quinn whitsitt
Fri Feb 09, 2024 2:38 pm
Sparker Reference Guide

Last post by quinn whitsitt
Replies: 45
by rcman50166 » Tue Feb 05, 2008 4:19 pm
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First post

OK. Everyone always seems to know more than me in almost every topic on this site. But this is my domain! High voltage electricity is what i know...

Last post

great job how can i help the fourms
45 Replies

387005 Views

Last post by quinn whitsitt
Fri Mar 01, 2024 10:52 am

Topics

Complete Plans for Advanced Combustion

Last post by jackssmirkingrevenge
Replies: 39
by Pete Zaria » Tue Nov 07, 2006 12:09 am
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A friend gave me $25 to draw him up complete plans for an advanced over-under combustion. I call it advanced because it has onboard propane...

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Last I checked his channel on youtube had all his cannon videos removed and replaced with minecraft videos. :roll:

Damn the easy dosing of dopamine...
39 Replies

284070 Views

Last post by jackssmirkingrevenge
Fri Jun 19, 2020 6:20 pm
How-to: Syringe Fuel Metering

Last post by jackssmirkingrevenge
Replies: 25
by jackssmirkingrevenge » Sat Feb 05, 2011 6:28 am
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I made a video tutorial for those who might have difficulty grasping the concept, or think it's somehow difficult or complicated :roll:

edit: in...

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Welcome from the land of the lurkers!

But now here comes my question, because my chamber is 30ml there is only ~0,6ml of atmospheric air in the...
25 Replies

191269 Views

Last post by jackssmirkingrevenge
Wed Mar 18, 2020 8:58 am
How to: Make a stun gun with a disposable flash camera

Last post by MightyBlue
Replies: 151
by Hotwired » Sat Aug 06, 2011 4:02 pm
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This is not a monkeys guide to smash a camera, solder two nails to the 300V capacitor, call it a stun gun, poke people with it and get suspended from...

Last post

Great Share and nice tutorial! thanks ;)
151 Replies

565527 Views

Last post by MightyBlue
Sun Sep 07, 2014 5:53 pm
What's the next big thing?

Last post by Dumbascii

by Dumbascii » Thu Jul 09, 2026 1:08 pm

Thanks @PCGUY inviting me to return after all these years.

What are the most dangerous things (combustion) since the Taternator II ? I lost...

0 Replies

1273 Views

Last post by Dumbascii
Thu Jul 09, 2026 1:08 pm
Propane gun build

Last post by jimmy101
Replies: 1
by Mb01 » Sun Jun 21, 2026 7:27 pm

First post

Before I build I want to see if my calculations are correct. If I start with the 1.5:1 ratio, I will have a 4 inch x 18 inch chamber and a 2 inch by...

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The propane should be 4%, so about 148cc.

Your chamber is 50% bigger than it needs to be. Might as well scale everything so that the fueling is a...

1 Replies

1894 Views

Last post by jimmy101
Sat Jun 27, 2026 3:40 pm
Boyles Law / Burnt Latkes Fuel Metering Calculation

Last post by Ratguy

by Ratguy » Wed Jun 24, 2026 2:49 pm

This is more of an informational post for people who are starting out and are not familiar with Boyles law. I decided to post this because I was...

0 Replies

2979 Views

Last post by Ratguy
Wed Jun 24, 2026 2:49 pm
Compression?

Last post by overdraft

by overdraft » Mon Apr 27, 2026 12:48 pm

Hi All!
I'm making a basic spud gun for an upcoming distance competition that is restricted to hairspray as fuel.
Obviously combustion in engines is...

0 Replies

17556 Views

Last post by overdraft
Mon Apr 27, 2026 12:48 pm
Automatic "rifled cannon"

Last post by RileyJames
Replies: 1
by Spuddy_boink » Fri Nov 21, 2025 12:25 am

First post

So I was looking at potato cannons (I know suprising right!?) And I notices they aren't terribly accurate so I figured hey make it more accurate and...

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Interesting idea, but that sounds like it could get complicated fast. Accuracy gains might be limited, and safety would be a big concern with...

1 Replies

262729 Views

Last post by RileyJames
Wed Feb 04, 2026 7:47 am
Spare parts throw down.

Last post by Driftboss3d
Replies: 13
by iggy1328 » Sat Jan 13, 2024 12:23 am

First post

Hey guys!
Long time lurker, thaught I should say hello,
Got a bit too drunk last night, woke up this morning with a new cannon.
First test run this...

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Been there — built one after a night out and was shocked how far a potato went. Fun as hell, but they’re dangerous and can be illegal; please be...

13 Replies

163213 Views

Last post by Driftboss3d
Tue Nov 11, 2025 9:19 pm
Pneumatic cannon not firing consistently – help needed

Last post by Driftboss3d

by Driftboss3d » Tue Nov 11, 2025 9:17 pm

Hi everyone,
I’ve been building a pneumatic cannon using 2 PVC, a 120 psi compressor, and a quick-connect valve, but I’m having an issue: the spud is...

0 Replies

114167 Views

Last post by Driftboss3d
Tue Nov 11, 2025 9:17 pm
Gas ignition issues

Last post by nene3170
Replies: 6
by MuhFreebrams99 » Sun Sep 29, 2024 8:54 am

First post

Anyone have ideas on how to keep the hairspray in the cannon while loading the potato? I'm currently spraying hairspray then loading the potato with...

Last post

That’s a solid idea about using the screw-off cap to spray hairspray directly into the back end of the cannon. To make sure the hairspray stays...

6 Replies

89365 Views

Last post by nene3170
Mon Sep 29, 2025 8:56 pm
My Combustion Cannon

Last post by virtuousyear
Replies: 6
by shardomasta » Sun Feb 05, 2012 11:19 am

First post

We're all proud of our powerful potato propelling creations- here's a forum designed specifically to show them off! Post youtube videos, pics, blogs,...

Last post

We're all proud of our powerful potato propelling creations- here's a forum designed specifically to show them off! Post youtube videos, pics, blogs,...

6 Replies

33759 Views

Last post by virtuousyear
Thu Sep 18, 2025 11:04 pm
two new spud guns

Last post by Darkharts
Replies: 10
by Sosebee » Wed Sep 24, 2008 12:04 am

First post

i am just using a bunch of pvc pipe and some screw on caps. i have been using pvc glue to glue everything together. im using hairspray as fuel....

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:) overall length 44 gas chamber 4 x16 internal space, (4400 4 IPS sch-40 COEXTRUDED CELLULAR CORE PVC-DWV PIPE ) barrel interchangeable one at 2 x23...

10 Replies

65578 Views

Last post by Darkharts
Sat Jul 12, 2025 4:01 am
is this spud gun still safe to shoot?

Last post by Billie34
Replies: 3
by Andrewis420Friendly » Sat Feb 01, 2025 4:46 pm

First post

used a handful of times 5 years ago and was stored in a canadian garage since. came back to it and discovered at the combustion chamber near the cap...

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Tiny cracks near the combustion chamber or cap of a device — especially if it's combustion-powered (like a potato cannon, spud gun, paintball...

3 Replies

47046 Views

Last post by Billie34
Mon Jun 16, 2025 11:39 pm
Butane can adapters?

Last post by OfficerBro
Replies: 6
by Techexical » Sun May 05, 2024 1:49 am

First post

Hey! New to the whole potato or whatever launching shenanigans stuff, I wanna know if anybody happens to know a valve or adapter of sorts that could...

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In New Zealand we have a lubricant / solvent manufacturer named CRC, their spray nozzles fit directly onto the butane, I've been using them for a...

6 Replies

138844 Views

Last post by OfficerBro
Tue May 06, 2025 8:54 pm
Where do I fire this thing?

Last post by CraigRepublic

by CraigRepublic » Tue Apr 01, 2025 6:51 pm

Hello! This is my first time posting and first time building a potato cannon. Im very confused on where I can fire this thing.

I know that most of...

0 Replies

149246 Views

Last post by CraigRepublic
Tue Apr 01, 2025 6:51 pm
Stun Gun Help

Last post by Spud
Replies: 6
by bigk_54 » Thu Nov 01, 2007 10:11 am

First post

Hello, Im pretty much a newbie here and I need a lil experienced help! Im sick of the D#@% bbq ignitor :evil: and I need something better! I am...

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Why do you need to take it apart? Also I have a vipertek stun gun, and I don't know how I should hook it up to my ignition chamber. Any suggestions?

6 Replies

65648 Views

Last post by Spud
Sat Mar 29, 2025 6:42 pm
Bell Reducer or Flush Hub Bushing

Last post by mick04u

by mick04u » Thu Mar 20, 2025 12:25 pm

Hello, I’m building a potato gun with a 4” combustion chamber and a 2” barrel. What would be a stronger transition from the 4” to 2” pipe, a bell...

0 Replies

153154 Views

Last post by mick04u
Thu Mar 20, 2025 12:25 pm
Getting white smoke backfire and singe marks in threads

Last post by jimmy101
Replies: 1
by mick04u » Mon Mar 17, 2025 9:49 pm

First post

I built a 6’ potato gun (4” x 2’ combustion chamber and 2” x 4” barrel). I’m using aqua net hairspray for the propellant. When shooting, a puff of...

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That is likely just residue from the spray and that kind of cap isn't meant for pressure so it is leaking a bit (not a big deal).

I would suggest...

1 Replies

46048 Views

Last post by jimmy101
Wed Mar 19, 2025 2:39 pm
Stun gun or Electric BBQ ignitor?

Last post by jimmy101
Replies: 19
by PYRO93 » Fri Aug 10, 2007 8:58 pm
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should I use a stun gun or electric BBQ ignitor in my gun?

AND WERE DO I GET ELECTRIC BBQ IGNITORS?

Last post

You can get the piezo BBQ igniters for pretty cheap. And they work just fine (and no battery to replace).

$2.25 at Walmart
19 Replies

129762 Views

Last post by jimmy101
Wed Mar 19, 2025 2:25 pm
Over shoulder potato cannon

Last post by Techexical
Replies: 12
by Techexical » Sat Aug 17, 2024 9:06 pm

First post

Hey all, I am building a combustion potato cannon for a school project, a 1.5 inch ABS pipe based cannon (yes I know, pretty risky seeing how people...

Last post

As it turns out it goes at 320-ish feet per second or 97 meters per second, still pretty solid for a second build, especially when I load it with a...

12 Replies

133189 Views

Last post by Techexical
Fri Dec 20, 2024 4:53 am
Multi-shot Combustion repeater

Last post by Guster132
Replies: 2
by Guster132 » Fri Nov 15, 2024 6:17 am

First post

Hey all,

Has anyone else successfully made a working combustion repeater able to make multiple shots?

I have just finished making my first fully...

Last post

That tippmann is quite cool!!

Here is what ive comeup with. Quite simple and works well!
Holds about 30 rounds... Ive not seen someone do one like...

2 Replies

56927 Views

Last post by Guster132
Mon Dec 02, 2024 6:26 pm
Spud gun powered by cooking oil?

Last post by Turbine32
Replies: 16
by Doctore » Sat Nov 16, 2019 1:31 pm
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Hello everyone!

I would like to share with you this rather crazy combustion cannon design. I am fairly convinced that it could work, but there is...

Last post

Super boulot mais pourquoi ne pas utiliser du pétrole de poêle ?
16 Replies

176726 Views

Last post by Turbine32
Wed Nov 13, 2024 5:39 pm
A new look at combustion cartridge Spud guns

Last post by jackssmirkingrevenge
Replies: 25
by Cthulhu » Sat May 27, 2017 9:27 pm
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I recently viewed a YouTube video showing off a potowizter which fired 3D printed projectiles from cartridges that made contact with the electric...

Last post

Some interesting developments found on YouTube, an atmospheric pressure combustion cartridge gun that uses hydrogen and oxygen generated by...
25 Replies

151104 Views

Last post by jackssmirkingrevenge
Thu Oct 31, 2024 11:37 am
School project potato cannon

Last post by Techexical

by Techexical » Wed Aug 28, 2024 11:58 pm

Hey all, I am building a combustion potato cannon for a school project, a 1.5 inch ABS pipe based cannon (I know, pretty risky seeing how people see...

0 Replies

187280 Views

Last post by Techexical
Wed Aug 28, 2024 11:58 pm

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Combustion Cannons

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