Pneumatic Cannons

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SpudFiles Potato Gun Commercial

Last post by quinn whitsitt
Posted in Combustion Cannons
Replies: 15
by PCGUY » Tue Oct 29, 2013 10:54 pm » in Combustion Cannons
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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...

Last post

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

1125574 Views

Last post by quinn whitsitt
Fri Feb 09, 2024 2:38 pm
Directional Control Valves (3way valves and stuff like that)

Last post by jpalf1
Replies: 86
by POLAND_SPUD » Sun Mar 07, 2010 1:12 am
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First post

Directional Control Valves, commonly refereed to as 3,4,5 etc. valves or spool/poppet valves etc., can be very useful for spuders.
They can be used...

Last post

very,useful info for a beginner such as myself.The links are great as well.Thankyou.(you won't believe this but as i was reading,my fridge comp...
86 Replies

552565 Views

Last post by jpalf1
Sat Apr 13, 2013 10:53 am
Sprinkler Valve Troubleshooting Guide

Last post by quinn whitsitt
Replies: 64
by noname » Sat Jun 16, 2007 12:15 am
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Sprinkler Valve Troubleshooting

This is a guide to sprinkler valve problems. Before creating a new topic to ask questions on why your valve isn't...

Last post

great job everyone
64 Replies

821406 Views

Last post by quinn whitsitt
Thu Feb 22, 2024 2:18 pm
Piston Valves Explained Visually

Last post by pavina
Replies: 178
by clide » Mon May 14, 2007 11:21 pm
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First post

I had this posted on Spudtech, but I am reposting it here to hopefully help some people out and allow for discussions/updates.

Well I made this...

Last post

Thanks for sharing this! It might also be useful to mention how friction and maintenance can affect performance over time. Looking forward to more...
178 Replies

967383 Views

Last post by pavina
Fri Sep 27, 2024 4:05 am
"How Much CO2 do I need?"

Last post by choke
Replies: 32
by BC Pneumatics » Sun Apr 01, 2007 9:52 pm
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For all those people out there looking for a rough idea of how much CO2 they will need for a chamber of any given size-
Just multiply the volume of...

Last post

Great piece of software :) I've been kicking numbers round my head for a while now, and wondered if someone here could confirm. I'm filling a 1.5 dia...
32 Replies

375046 Views

Last post by choke
Thu Jul 04, 2013 2:38 pm
Valve Cutaways

Last post by jhalek90
Replies: 8
by PCGUY » Sat Feb 26, 2005 9:10 pm

First post

VALVE CUTAWAY

Provided By - Longshot

These are some pictures of some of the most popular valves used on spud cannons. Only difference is, these...

Last post

Can someone fix the picture links??

8 Replies

92462 Views

Last post by jhalek90
Wed Oct 07, 2009 2:13 pm

Topics

high pressure valves

Last post by wngovr
Replies: 18
by wngovr » Fri Sep 04, 2009 9:31 pm
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I found a qev at McMaster-Carr that can handle 1200 psi. At 170.00$ I want to make my own valve. Can we make valves that can handle that kind of...

Last post

Gippeto,
Im thinking about doing a cross between a barrel piston and a q.d.v. valve.

Setiously though why not just beef up xm2 instead of a whole...
18 Replies

6960 Views

Last post by wngovr
Sun Sep 06, 2009 10:25 pm
3" pressure-rated PVC

Last post by Technician1002
Replies: 16
by dimwell » Sun Sep 06, 2009 3:04 am
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I can't find 3 pressure-rated PVC anywhere locally, so I used 2 PVC and extended the chamber by a third to maintain volume.

Where do you buy your 3...

Last post

and with a sprinkler vavle i dont think a .3:1 ratio would be very good. a sprinkler valve just isnt crazy efficent like the QDV

I've seen many...
16 Replies

3705 Views

Last post by Technician1002
Sun Sep 06, 2009 8:34 pm
copper coaxal help

Last post by turner
Replies: 2
by turner » Sat Sep 05, 2009 11:45 pm

First post

right now i have a 11 piece of 3/4 copper. i soldered a female addapter to it but the threads go smaller than the walls of the pipe. what fitting...

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thanks its just kinda hard to get rides to the ace all the time. i have the back, the barrel is just the hard part

2 Replies

2006 Views

Last post by turner
Sun Sep 06, 2009 5:42 pm
Damage inc.(first piston valve!)

Last post by geardog32
Replies: 14
by geardog32 » Sat Sep 05, 2009 8:24 pm

First post

so this is my first piston valve cannon, and i must say WOW! my first pneumatic cannon was a sprinkler valve cannon, and it was pretty powerful but...

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yeah the bumper has room for improvement. really the center piece of rubber is the bumper and the two side pieces are just to keep it in place. i...

14 Replies

4744 Views

Last post by geardog32
Sun Sep 06, 2009 2:18 pm
600 PSI T piston choices and recommendations.

Last post by Hotwired
Replies: 3
by boyntonstu » Sun Sep 06, 2009 7:13 am

First post

Knowing what you have learned from experience, how would you go about building a T piston for a 3/4 or a 1/2 copper barrel?

Would the T size be 1 or...

Last post

600psi hm?

We had a natter about copper pipe pressure a while back elsewhere .

Those would be UK standards of course but there's no reason for...

3 Replies

1405 Views

Last post by Hotwired
Sun Sep 06, 2009 1:02 pm
1/2 Copper QEV Gun

Last post by qwerty
Replies: 14
by qwerty » Sat Sep 05, 2009 12:55 pm

First post

Here is my new QEV gun. Its pretty simple and powerful at 70 psi it will shoot a screw dart around 400m and has alot of kick i realy need a good...

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Yeah i cant fix that problem because when i put on the the 15mm compression fitting it pushed the pipe upwards and it dosent go back down.
I need to...

14 Replies

6698 Views

Last post by qwerty
Sun Sep 06, 2009 2:59 am
problem with qev rifle

Last post by qwerty
Replies: 13
by twizi » Sat Sep 05, 2009 5:59 pm

First post

i have made a rifle that has a 1/2 qev from fastnel its piloted by a 1/4 qev. witch i want to pilot by a modded blow gun. but i see that it the best...

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What type of blowgun are you using because i had one that had less flow than a schrader! if you are using those red trigger ones i would try taking...

13 Replies

2290 Views

Last post by qwerty
Sun Sep 06, 2009 2:57 am
Noob Help - first pneumatic canon

Last post by spduncan
Replies: 5
by spduncan » Sat Sep 05, 2009 2:06 pm

First post

I'm very inexperienced with cannons. I've built a couple combustion cannons before, the biggest being 6 ft tall (ended up I built it out of DWV...

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That's a good point you bring up. I tend to over think things and went for something with more bends. I assume by an inline you me an entire cannon...

5 Replies

1634 Views

Last post by spduncan
Sat Sep 05, 2009 5:30 pm
Air gun valve vs. QDV @ high pressures

Last post by POLAND_SPUD
Replies: 9
by auxiliary » Fri Sep 04, 2009 6:01 pm

First post

I have been thinking about making an gun similar to the XM2. I want it to mimic the actions and looks of a pellet gun, but be in a greater caliber...

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as JSR has mentioned hammer valves have poor performance, so you need something else...

btb is probably right that his push button is what you are...

9 Replies

5186 Views

Last post by POLAND_SPUD
Sat Sep 05, 2009 5:06 pm
QDV-Tee-1.5-porting

Last post by Brian the brain
Replies: 21
by dewey-1 » Thu Sep 03, 2009 5:17 pm
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Here is a preliminary CAD model for a QDV in a Tee.

The Tee (Dark Blue) is a 2 inch that has 2 to 1-1/2 bushings (Red) on each end.There are...

Last post

Ah...indeed...that is true...
Maybe the barrel part should be replaced by a Bolt
21 Replies

6472 Views

Last post by Brian the brain
Sat Sep 05, 2009 3:47 pm
Piston valves

Last post by Technician1002
Replies: 19
by nosgroth » Tue Aug 18, 2009 5:43 am
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Hello, its my first time here, im 15 and I've had some experience with simple spring actuated ball valve cannons. I have carefully examined...

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Technician i'm interested in how you connected the HDPE to the drill press if the hole didn't go all the way through the piston?

I made a hole just...
19 Replies

6305 Views

Last post by Technician1002
Fri Sep 04, 2009 2:52 pm
Jebus

Last post by Technician1002
Replies: 17
by inonickname » Thu Sep 03, 2009 6:11 am
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:shock: clicky

Needs around 90 psi in from a shop compressor. Not sure on the kind of fittings, perhaps hydraulic QD.

Any estimates on price? It...

Last post

On topic: those jacks are used to lift houses when the foundation settles crooked. (they're placed under the foundation, jacked and metal braces go...
17 Replies

3872 Views

Last post by Technician1002
Fri Sep 04, 2009 10:01 am
My first gun "M225" v.1

Last post by pipeboyswe
Replies: 4
by pipeboyswe » Thu Sep 03, 2009 1:44 pm

First post

Hi im new on spudfiles and this is my first gun so far:
Barrel: 65cm of 12mm copperpipe
Chamber: 25cm of 24mm copper
QEV: 3/8 ballvalve piston is 1/2...

Last post

Im from Sweden, 12 and 24mm pipes can be bought in almost every hardware store here.

This site rockz!!

4 Replies

2745 Views

Last post by pipeboyswe
Fri Sep 04, 2009 8:06 am
Pressure of a 3 way valve

Last post by POLAND_SPUD
Replies: 6
by jor2daje » Thu Sep 03, 2009 5:18 pm

First post

I just got 3 Mead MV 20 3 way valves off ebay, they are rated to 120 psi, but I'm wondering if anyone else who has used them before has taken them...

Last post

hey that's a nice deal... 3 of them for 13$ (with shipping)

have a look here first ->

most pneumatic valves are rated for 10 bar because it's just...

6 Replies

1619 Views

Last post by POLAND_SPUD
Fri Sep 04, 2009 4:57 am
Pressure Washer Hose Ques...

Last post by THUNDERLORD
Replies: 10
by THUNDERLORD » Sun Aug 30, 2009 9:29 pm

First post

I am Interested in THIS product.

But really my question is about the hose.
I want to shorten the hose to about 4, 5 or 6 feet.

What would be the...

Last post

Thanks all, for replies!
Got some ideas now too.
I might look into 1/4 paintball type hose (connected to a sort of expansion chamber),
if having...

10 Replies

3450 Views

Last post by THUNDERLORD
Thu Sep 03, 2009 10:28 pm
Barrel / Valve Seat Transition Question

Last post by Technician1002
Replies: 14
by velocity3x » Tue Sep 01, 2009 10:36 am

First post

Does anyone know how gas behaves when going through a conical transition? I'm planning a conical transition from an 1.5 valve seat to a 1.25 barrel...

Last post

You got it. Good job. :D

EDIT;

The transition issue is the main reason I am building a 3 inch QDV. The valve will be oversize and then transition...

14 Replies

3225 Views

Last post by Technician1002
Wed Sep 02, 2009 8:29 pm
Piston Face Question

Last post by phatjohnsn
Replies: 5
by phatjohnsn » Wed Sep 02, 2009 12:11 pm

First post

Hey guys,

I've been a lurker for awhile and this is the first time I'm posting as I've finally begun building myself a gun! Hopefully you won't...

Last post

Thanks again Hubb and Technician!

5 Replies

860 Views

Last post by phatjohnsn
Wed Sep 02, 2009 1:36 pm
Lookey what I got

Last post by THUNDERLORD
Replies: 12
by jor2daje » Tue Sep 01, 2009 6:57 pm

First post

I just recieved 5 1/4 qevs for $14.00 from ebay :)

Other than to show them off, I would appreciate some suggestions on what to do do, I am...

Last post

umm what about a semi auto pellet rifle with a spring fed mag?

Or a five barreled gatling type mini-gun (paintball?) design...

It could have a...

12 Replies

2912 Views

Last post by THUNDERLORD
Wed Sep 02, 2009 12:36 pm
Ultra-tiny seals

Last post by jeepkahn
Replies: 9
by inonickname » Wed Sep 02, 2009 4:18 am

First post

There are several applications for which I need rubber seals on an extremely small scale. For example, I would like to machine a miniature TAC...

Last post

o-rings are available all the way down to 1mm id and .25mm cross section... check auto parts stores...

9 Replies

2579 Views

Last post by jeepkahn
Wed Sep 02, 2009 9:57 am
my first pneumatic gun: half inch AA chucker

Last post by THUNDERLORD
Replies: 5
by geniusbomberman » Sat Aug 08, 2009 4:57 pm

First post

this is my first pneumatic and second gun, the chamber is about 16-18 total of sch 40 pressure rated 1 PVC, but because some of it is above it is a...

Last post

...
2 - To put a bike schrader into an endcap, drill a hole through the cap that is the same size as the shaft of the schrader and work the schrader...

5 Replies

3805 Views

Last post by THUNDERLORD
Wed Sep 02, 2009 9:23 am
Bicycle Pedal Powered Air Compressor

Last post by THUNDERLORD
Replies: 3
by boyntonstu » Tue Sep 01, 2009 7:28 am

First post

I wonder if this could be upgraded to a shock pump?

BoyntonStu

Last post

IDK about Landfills filling up with CO2 cartridges which he mentions TWICE! :x

Seems like the tiny co2 cart.s would benefit landfills since they're...

3 Replies

2408 Views

Last post by THUNDERLORD
Tue Sep 01, 2009 4:49 pm
Piston help

Last post by Hubb
Replies: 10
by covey12 » Thu Aug 27, 2009 5:11 pm

First post

ok so i have tracked the problem down to my pistons having to much room between them and the casings, i have no access to a lathe so i need to make a...

Last post

you don't need a lathe to make an o ring groove. i made an o ring groove in my piston using a miter box, saw, dremel, some files and alot of...

10 Replies

3058 Views

Last post by Hubb
Tue Sep 01, 2009 12:20 pm
piston sealing face blowing out

Last post by geardog32
Replies: 5
by geardog32 » Mon Aug 31, 2009 10:40 am

First post

the sealing face on my new piston valve keeps blowing out at about 40 psi. it does not ruin the rubber washer, i just have to push the piston back...

Last post

i got a metal washer that is just smaller than the barrel and it seems to work fine now. now i just have to give it a name and post it.

5 Replies

1596 Views

Last post by geardog32
Mon Aug 31, 2009 8:16 pm
3" sch 40 plug

Last post by c11man
Replies: 5
by spudtyrrant » Sun Aug 30, 2009 7:52 am

First post

hey guys I'm looking for a pressure rated fitting similar to this
but 3 in diameter do you think you guys could help me out.

p.s. The kind I'm...

Last post

yeah they have good prices and alot of options. and if you cant find it just call, they are very helpfull

5 Replies

1341 Views

Last post by c11man
Sun Aug 30, 2009 12:46 pm
Piston Gap Drawing

Last post by Technician1002
Replies: 13
by dewey-1 » Sat Aug 29, 2009 12:03 pm

First post

This drawing is made to give people an idea of what a 1mm gap looks equivalent to in a 1, 2 and 4 inch diameter.
Note dimensions are Imperial with...

Last post

Good drawings, but it isn't quite a fair comparison. The area of the gap and the drawn hole may be the same, but the narrow gap will restrict airflow...

13 Replies

3329 Views

Last post by Technician1002
Sun Aug 30, 2009 10:46 am

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