Combustion Cannons

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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

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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...

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great job how can i help the fourms
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Last post by quinn whitsitt
Fri Mar 01, 2024 10:52 am

Topics

Moonlight- Something a little different.

Last post by spencetron
Replies: 19
by spencetron » Thu Mar 26, 2009 1:49 pm
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This is my new cannon. I recently moved into an apartment for college and I wanted to make a neat looking, unique, smallish combustion to shoot...

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the fill valve is an airsoft gas gun magazine fill valve. I got mine from an old magazine. You can buy extra refill valves though:

The thing at the...
19 Replies

9123 Views

Last post by spencetron
Sun Mar 29, 2009 1:37 pm
Homemade Hydrogen

Last post by john bunsenburner
Replies: 23
by Rob748 » Tue Mar 24, 2009 9:34 pm
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First post

I tested something with some chemicals and I stumbled across a way to make hydrogen with two easy to get chemicals. Drano in crystal form, a glass...

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I am highly doubtful about that reaction, the first two steps of my reaction have to be true, as aluminium is covered by a thin layer of oxide, the...
23 Replies

9108 Views

Last post by john bunsenburner
Sat Mar 28, 2009 1:03 pm
..........

Last post by chrissilvermancs
Replies: 14
by chrissilvermancs » Fri Mar 13, 2009 5:53 pm

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14 Replies

5660 Views

Last post by chrissilvermancs
Sat Mar 28, 2009 3:00 am
Harnessing DDT

Last post by jimmy101
Replies: 8
by inonickname » Wed Mar 25, 2009 3:28 am

First post

Well this project is mainly the theoretical, inspire higher thinking type. That aside, action may be taken depending on the results.

The topic is...

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Like psycix said. Why?

DDT doesn't release any more energy.

The pressure pulse may reach extremely high values but that pulse lasts for only a tiny...

8 Replies

3876 Views

Last post by jimmy101
Wed Mar 25, 2009 2:05 pm
multiple chambers

Last post by psycix
Replies: 11
by jon_89 » Fri Mar 20, 2009 7:44 pm

First post

Would there be any benefits or downfalls to having multiple chambers? I typed the numbers in hgdt with two different chambers with eqaul volume and...

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So I guess they don't sell larger sizes, cause its the larger stuff that we're after. Like 4-6 ID pipe
Go metal then.

11 Replies

3000 Views

Last post by psycix
Wed Mar 25, 2009 7:19 am
New guy here. Chamber design question (venturi design)

Last post by Ragnarok
Replies: 38
by TideJoe » Tue Mar 24, 2009 9:54 am
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I'm in the process of gathering info/parts for a 2.5 cannon for tennis balls. I've got a friend that has a cannon that he uses to shoot golf balls....

Last post

Well, you're right on the reduced drag ball (green) being the winner, but you're quite a way out on the actual numbers: Answers

Exact figures are...
38 Replies

10753 Views

Last post by Ragnarok
Wed Mar 25, 2009 4:17 am
...........

Last post by jrrdw
Replies: 10
by chrissilvermancs » Sun Mar 22, 2009 4:10 pm

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All over and unders have the disadvantage of the joining elbow being the weak point. A gusset/barrel support would have stopped this from happening.

10 Replies

3008 Views

Last post by jrrdw
Tue Mar 24, 2009 12:51 pm
gas ball valves?

Last post by super spuder
Replies: 6
by super spuder » Sun Mar 22, 2009 9:27 am

First post

I have been working on my first propane cannon on and off for a while now, i am stuck right now at making the meter. I went to TSC (they all know...

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hmm never knew that, anyways, got there and they didnt have any pressure gauges that i wanted, so i talk to one of my friends and he said to check...

6 Replies

3075 Views

Last post by super spuder
Sun Mar 22, 2009 7:34 pm
Hi & Help :)

Last post by chrissilvermancs
Replies: 12
by scentless_apprentice » Fri Mar 20, 2009 2:32 am

First post

Hey all, Im a would be first time cannon maker.

Some friends and I have been talking about making a cannon forever so I figure its time to actually...

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12 Replies

2293 Views

Last post by chrissilvermancs
Sun Mar 22, 2009 5:26 pm
Different Burst Disk holder ?

Last post by Rob748
Replies: 13
by Rob748 » Fri Mar 20, 2009 9:53 pm

First post

Well Im putting together my biggest advanced combustion cannon, its a 4 inch chamber about 24 inches long, with a 10 foot barrel for a .8:1 ratio. I...

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Yeah I know this thing could blast through 3 layers cause I have a mini that blasted through 3 layers .5 inch in diamter...... you probably wont...

13 Replies

5433 Views

Last post by Rob748
Sat Mar 21, 2009 3:29 pm
Single Pipe C:B Ratio

Last post by jimmy101
Replies: 10
by sgort87 » Fri Mar 20, 2009 1:44 pm

First post

I started a big discussion on this a long time ago, and as far as I know, nothing became of it. I'm looking to see if anyone has did any tests using...

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The lighter the ammo and the lower the friction ...

Probably want a smallish sized chamber so it has a chance to actualy burn a significant fraction...

10 Replies

2342 Views

Last post by jimmy101
Sat Mar 21, 2009 2:38 pm
Benefits of a large Cannon

Last post by jimmy101
Replies: 23
by Rob748 » Tue Mar 17, 2009 2:24 pm
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I want this cannon to be the loudest, strongest, fastest of all the ones I built.

So I have this question, I have two 4 inch 220 rated psi...

Last post

Yes, it will make it more accurate. It will be as accurate as the rest of the variables are. Firing the same shell repeatedly is only accurate to...
23 Replies

5638 Views

Last post by jimmy101
Fri Mar 20, 2009 1:17 pm
what did i do wrong, what should i do now?

Last post by starman
Replies: 9
by jct0064 » Fri Mar 20, 2009 12:07 am

First post

I made a cannon the other day:
Barrel: 2 diameter 48 long (volume: 150.80)
Chamber: 4 18 long (volume: 226.19)
C:B ratio is 1.5:1
I shot it and then...

Last post

OK, I get the feeling you need to be doing a little more homework and study on your own here. All of this info is available on the site and...

9 Replies

3149 Views

Last post by starman
Fri Mar 20, 2009 2:09 am
Great Idea, I cant find anyone that has tried it !

Last post by starman
Replies: 14
by Rob748 » Wed Mar 18, 2009 9:10 pm

First post

So I was on Hgdt running some simulations on my advanced combustion gun thats only has a end coupler and ball valve on it so far...... I found that I...

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well I might be interested in trying one of ur ideas....... lol

Maybe you would, but not until after I try it first my man... 8)

14 Replies

8004 Views

Last post by starman
Thu Mar 19, 2009 2:51 pm
Hello and DWV

Last post by starman
Replies: 15
by bijoon » Mon Mar 16, 2009 10:19 pm
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Hi, I have lurked this forum and other sites for years now. I haven't built a spud gun in over a year now and kind of got out of the whole scene. Now...

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I'm not saying that PVC combustion cannons are unsafe. ABS is just the better option, mostly due to my climate. For at least 5 months of the year,...
15 Replies

5013 Views

Last post by starman
Wed Mar 18, 2009 2:42 pm
Combustion "rifle" + Hello Thread

Last post by King_TaTer
Replies: 15
by Steel Sovereignty » Sun Feb 24, 2008 10:08 am
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Hello Spudfiles, I've been getting interested in spud guns for the past couple of weeks now and have frequently come back here for inspiration and...

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Great attempt for a beginner. Hell, you've got the metal why not make a hybrid? No I'm only joking, they take some big money and experience to build....
15 Replies

8761 Views

Last post by King_TaTer
Mon Mar 16, 2009 9:27 pm
Whats the Easiest Spark strip to build ? and fan power ?

Last post by inonickname
Replies: 4
by Rob748 » Sat Mar 14, 2009 11:24 pm

First post

My Last Advanced Combustion cannon before I go experimenting with a steel hybird thats like really small lol.

Any ways

4 inch chamber by 20...

Last post

You could also run your fans off a rechargeable battery for airsoft or radio controlled cars.

I mean put the copper tape on a 1/2 piece of PVC, cut...

4 Replies

1676 Views

Last post by inonickname
Sun Mar 15, 2009 12:52 am
Building first combustion need advice

Last post by THUNDERLORD
Replies: 7
by colty-bear » Tue Mar 03, 2009 8:02 pm

First post

I want to make a cannon but not just a cannon a breach load cannon i want to open the back with the threaded cap and put in the potato from there can...

Last post

Yeah, if IRC co-axial combustions have very diminished performance.
(Just from research on SF's)

So, what would be the benefit of that?

If you are...

7 Replies

4902 Views

Last post by THUNDERLORD
Tue Mar 10, 2009 11:50 am
Spudgun power

Last post by Ragnarok
Replies: 18
by Demon » Fri Mar 06, 2009 6:44 pm
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In the Canada, whats cool is that combustion and pneumatic weapons are considered as the same BUT the fps must not be higer then 500 and the energy...

Last post

However, when I talk to people about my hobby, I make sure to leave certain words out. And when people do mention those words, I quickly jump onto it...
18 Replies

7534 Views

Last post by Ragnarok
Sun Mar 08, 2009 3:29 pm
Chamber Fan ???

Last post by psycix
Replies: 9
by Rob748 » Tue Mar 03, 2009 8:24 pm

First post

Ok I tore apart a monitor and found two brushless motors. One is about a inch and a hafl wide and the other is 3 inches. The Smaller chamber fan went...

Last post

Or use calipers. Most spudders can't live without em.

9 Replies

4501 Views

Last post by psycix
Sun Mar 08, 2009 2:51 pm
Hairspray propane %

Last post by jimmy101
Replies: 1
by Demon » Fri Mar 06, 2009 5:33 pm

First post

Does someone here knows how much % of propane is there is normal hairspray? Because i know that they use propane as a propellant and i would need to...

Last post

Most spray cans are more propellant than stuff being propelled. For hairspray i would figure that 80 to 90% of what comes out'a the can is propane....

1 Replies

1333 Views

Last post by jimmy101
Fri Mar 06, 2009 9:13 pm
Propane bottle question

Last post by ramses
Replies: 13
by Demon » Thu Mar 05, 2009 6:12 pm

First post

I want to make my first combustion cannon a metered one, so i really need to know how do you attached you propane bottle with the adapter with built...

Last post

no, I meant the valve you would need to buy to use with the 1/4 NPT adapter you could buy off the internet. The propane torch includes a suitable...

13 Replies

4461 Views

Last post by ramses
Fri Mar 06, 2009 5:20 pm
A different way of sparking...

Last post by Hubb
Replies: 12
by Hubb » Wed Mar 04, 2009 11:24 am

First post

I'm in the mood to build a new combustion. This time, I want it over / under. It's going to have all the features that's needed (propane meter, fan,...

Last post

I've been thinking about this whole thing, and I have come to the conclusion that a spark strip and one fan standing upright is the best, and easiest...

12 Replies

3144 Views

Last post by Hubb
Fri Mar 06, 2009 4:30 pm
Static guard spray

Last post by Demon
Replies: 11
by Demon » Mon Mar 02, 2009 3:33 pm

First post

I just searched a bit on the internet and most where saying that static guard was the best fuel for combustion spudguns( luckily, a shop sells it...

Last post

I dont understand, this is like an connector with an 1/4 inch npt side, the other an pretty strange thread, is it an compression thread ? and of what...

11 Replies

6787 Views

Last post by Demon
Thu Mar 05, 2009 5:58 pm
Sureshot BL-520 action video

Last post by grock
Replies: 8
by jagerbond » Wed Mar 04, 2009 8:44 am

First post

Bag o spuds, TVs CRTs 3/4 Plywood, car doors... nice little Tuesday really.

Last post

geez mike. i hope you didnt leave that mess for me on saturday....

8 Replies

3222 Views

Last post by grock
Thu Mar 05, 2009 1:20 am

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