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...

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

908325 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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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...

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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

444327 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

394619 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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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...

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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

620226 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...

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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

329215 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

78834 Views

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

Topics

Potential 6mm Airgun Sniper (need help)

Last post by Brian the brain
Replies: 18
by BartSkillZ » Thu Mar 20, 2014 10:39 am
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Hey there,

This is my first topic on spudfiles :)

I'm trying to build an airsoft sniper;

The connections are 3/8''. I use a 3 way 2 port valve to...

Last post

Google double action trigger

Seems like the easiest way.

( net als sommige klappertjespistolen.Elke keer als je de trekker overhaalt gaat vanzelf...
18 Replies

10111 Views

Last post by Brian the brain
Mon Jun 09, 2014 5:26 am
QEV is this needed

Last post by Ianbuckwell
Replies: 3
by Ianbuckwell » Fri Jun 06, 2014 11:30 am

First post

I currently have made an airgun, just a basic air tank - slide valve - QEV - barrel, with a small cylinder the approx volume of barrel and space in...

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OK thanks.

3 Replies

1764 Views

Last post by Ianbuckwell
Mon Jun 09, 2014 1:17 am
Coaxial problems

Last post by Juggernaut12121
Replies: 4
by Juggernaut12121 » Wed May 28, 2014 3:08 pm

First post

I've had my coaxial air gun for a while and it never had a problem. Just recently I decided to make and use a 1'' barrel in it instead of my 3/4''...

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I have shop class again next year, so hopefully my teacher will let me make two nice new pistons for my air guns (and maybe a third for a later build...

4 Replies

2056 Views

Last post by Juggernaut12121
Tue Jun 03, 2014 5:17 pm
How does this valve work?

Last post by matti
Replies: 2
by vng21092 » Mon Jun 02, 2014 9:01 am

First post

Whats this and how does it work?

Last post

Whats this and how does it work?

There is a quite detailed description for that item at the amazon site you are linkin.. Read it.. Nothing special...

2 Replies

2116 Views

Last post by matti
Tue Jun 03, 2014 1:21 am
Rain Bird 1" Inline Valve Question

Last post by Boomer58cal
Replies: 15
by TheLost » Fri May 23, 2014 6:07 pm
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Hey guys,

I've been making air cannons for awhile, from overpowered nerf shooters, to full size football launching monsters, but I've never dealt...

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Fair enough... I guess I'll have to shoot you in the back :D

See you next time

Boomer
15 Replies

8325 Views

Last post by Boomer58cal
Fri May 30, 2014 10:46 pm
First launcher, what type of valve?

Last post by i-will
Replies: 2
by wyattfg » Mon May 05, 2014 9:47 pm

First post

This is my first launcher to build myself. I've helped build my girlfriend's brother's launcher and shot it with him. He used a ball valve, and I...

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It sounds like u don't plan on building a collection. With only one launcher to concentrate on I'd build it with quality standard parts for easier...

2 Replies

2043 Views

Last post by i-will
Thu May 29, 2014 11:58 am
Piston Problems

Last post by bravootome
Replies: 20
by Suedo » Sun Mar 23, 2014 11:19 am
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Hey guys, I'm having trouble with not only piston design but piston actuation as well. Every piston I have designed so far has failed as instead of...

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What do you mean by hot glue and pin? Do you suggest I bolt it in rather than glueing it?

Myself i do not use any bolt for any of my 1000 pistons...
20 Replies

8297 Views

Last post by bravootome
Wed May 28, 2014 2:18 pm
New marshmallow gun

Last post by Solar
Replies: 5
by Solar » Mon May 26, 2014 3:11 am

5 Replies

4554 Views

Last post by Solar
Mon May 26, 2014 8:34 pm
QEV trigger release

Last post by Ianbuckwell
Replies: 69
by Ianbuckwell » Tue Apr 01, 2014 1:26 pm
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Hi, just signed up, so hello everyone. I have tried googling before joining but was after a definitive answer from the experts.

I have purchased a...

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Thanks for pointers and spoke to my dad and he says the hydraulic seals won't work well with air, I will look into those regulators,thanks
69 Replies

20943 Views

Last post by Ianbuckwell
Mon May 26, 2014 9:10 am
large vacuum cannon ?

Last post by PracticalProjects
Replies: 9
by matti » Wed May 14, 2014 10:34 am

First post

I got this idea today.. I have seen many ping pong ball vacuum launchers posted at youtube and many other sites. They are quite powerful, launching...

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Should be an interesting project! I recently watched the mythbusters episode where they built one to fire a ping pong ball over 1000mph. Pretty cool

9 Replies

5600 Views

Last post by PracticalProjects
Fri May 23, 2014 4:51 am
QEV outlet port size??

Last post by Ianbuckwell
Replies: 4
by Ianbuckwell » Sun May 18, 2014 1:12 pm

First post

I purchased a black rectangular supposed 3/4 qev from china. Firstly the hole that the seal seals against is maybe 1/3 and the gold colored threaded...

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Was thinking of using lead and maybe try wood, maybe put it in freezer before hand?

If that doesn't work I have some aluminum I can use, the...

4 Replies

1817 Views

Last post by Ianbuckwell
Wed May 21, 2014 9:06 am
Itty Bitty Hammer Valve

Last post by bravootome
Replies: 4
by vng21092 » Fri May 16, 2014 7:29 pm

First post

The whole mechanism is housed in a 1/2'' PVC coupling, stem is sealed and there's practically no dead space. I made this with the intention of having...

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As we talk about thing to reuse....I had been testing, and it working pretty fine..those things that cleans the windscreen of your car. I dont have...

4 Replies

4882 Views

Last post by bravootome
Sat May 17, 2014 1:25 pm
Second cannon, looking for BIG improvements.

Last post by Boomer58cal
Replies: 11
by Brad1895 » Sat May 10, 2014 11:53 pm

First post

As this is my first post, I should give you all a quick back story. A few years back I made a simple 3 , ball valve, piece of junk. It couldn't pass...

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You could try 3 shrader valves, 3 hand pumps and 3 energetic high school kids in parallel. You could fuel them with energy drinks :lol:

11 Replies

3976 Views

Last post by Boomer58cal
Sat May 17, 2014 12:44 pm
Corn Cannon

Last post by Fnord
Replies: 19
by BigDeutcher » Wed Sep 04, 2013 7:46 am
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Recently took the kids to a corn maze and low and behold they had a corn cannon and being boys they now want one.

It was pretty cool firing 1/3 of...

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I really have to advise against using plastic as any chamber material.
This is because plastic has a structural half-life of about 3 hours when kids...
19 Replies

13739 Views

Last post by Fnord
Fri May 16, 2014 5:31 pm
Barrel/cylinder ratio - sorry for yet another thread

Last post by Ianbuckwell
Replies: 4
by Ianbuckwell » Sat May 10, 2014 7:45 am

First post

If using a 150psi, iirc the barrel to cylinder ratio should be about 1:1, do you just use this figure or add say a 10% gain to the cylinder just to...

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Just seen this and it has answered alot of my questions in other thread, I need to increase bore and pressure.

Does barrel length (thinking) either...

4 Replies

2331 Views

Last post by Ianbuckwell
Thu May 15, 2014 8:37 am
New semi auto build

Last post by Ragnarok
Replies: 3
by Datsun » Mon May 12, 2014 4:44 am

First post

Hey guys,

I'd like to build a semi auto air rifle, however I have a few question.

I'm planning on using a qev as my main valve and a slide valve to...

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That's of negligible concern. Once a valve opens on a timescale of less than a few milliseconds (as QEVs do), it means that the projectile is only at...

3 Replies

1740 Views

Last post by Ragnarok
Tue May 13, 2014 11:11 am
Another valve question

Last post by Ragnarok
Replies: 1
by wyattfg » Sun May 11, 2014 3:11 pm

First post

Is it possible to use 2 chambers using 2 sprinkler valves, one for each chamber? I would have a blowgun trigger coming out of the top of each of them...

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Pulling both triggers simultaneously probably won't be on the time scales air cannons work on.
You'd be better off plumbing both sprinkler valves...

1 Replies

1043 Views

Last post by Ragnarok
Sun May 11, 2014 5:01 pm
QEV, 3 way valve, slide valve help

Last post by Major Collins
Replies: 21
by 1nxtmonster » Fri Feb 07, 2014 5:38 pm
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So..... i'm pretty close to finishing my qev airsoft gun. But the slide valve isn't really working well as a trigger b/c of friction, consistency,...

Last post

Ahhh...how bout this:

Due to size constraints, i'm not sure if it can fit in the gunstock. So I was doing some thinking, and came up with a...
21 Replies

11705 Views

Last post by Major Collins
Fri May 09, 2014 3:39 pm
Using 2 QEVs in parrallel

Last post by Ianbuckwell
Replies: 3
by Ianbuckwell » Thu May 08, 2014 11:29 am

First post

Did a quick search and found one result of using 2 qevs, is it possible to use 2 in parallel to increase power/air flow, these even look like they...

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Just thinking if someone wanted to make something a bit bigger than the 3/4 that really only seem 1/2s with the gold inserts installed, the 1 inches...

3 Replies

1662 Views

Last post by Ianbuckwell
Fri May 09, 2014 7:49 am
Ammo tolerance in barrel?

Last post by jackssmirkingrevenge
Replies: 3
by Ianbuckwell » Tue May 06, 2014 11:11 am

First post

I was just wondering what tolerance you guys used/still found efficiently effective?

I am particularly interested in guns that use some kind of feed...

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I should have chosen my barrel size more carefully as cheap BB ammo is not available in my size, only expensive proper machine bearings

Be warned...

3 Replies

1506 Views

Last post by jackssmirkingrevenge
Wed May 07, 2014 5:58 am
can I use this valve??

Last post by RAYZOR51
Replies: 2
by RAYZOR51 » Tue May 06, 2014 12:01 am

First post

Can I use this valve as a trigger in conjunction with a QE valve and air chamber?

Link for valve purchase

Last post

Thanks JSR. I have this topic bookmarked already, forgot all about it!!!!!!!

Sorry for being so lazzzy

2 Replies

1364 Views

Last post by RAYZOR51
Tue May 06, 2014 4:31 pm
Valves, particularly, QEV and slide valves

Last post by Brice
Replies: 5
by Ianbuckwell » Mon May 05, 2014 1:41 pm

First post

This is my first project and am keen to get started, I have ordered and received a QEV from China. Are the more expensive brand name ones worth the...

Last post

Sometimes there is a difference between cheap european QEV which are made out cheap aluminium and have poor tolerances for the threads and more...

5 Replies

3657 Views

Last post by Brice
Tue May 06, 2014 8:25 am
Semi-auto Vortex Cannon! (SUCCESS)

Last post by matti
Replies: 74
by shiddymunkie » Mon Mar 03, 2014 10:03 pm
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I'm so glad I found this thread! First and foremost, thank you highvoltagefeathers for sharing your experiences with this build. I actually saw your...

Last post

I don't have much time right now, but few short answers here..

Cone angles I figured from my studies of SUTTON's Rocket Propulsion Elements book.I...
74 Replies

35474 Views

Last post by matti
Mon May 05, 2014 1:14 pm
What primciples does this use?

Last post by POLAND_SPUD
Replies: 1
by Ianbuckwell » Thu May 01, 2014 6:15 am

First post

I came across this whilst looking for ammo loading ideas (please post if you have any good lings) does he just use the blow gum as a trigger and the...

Last post

it uses the blowgun as the main valve and there's a flow limiting fitting between the air tank and the chamber. Not very complicated or advanced but...

1 Replies

1628 Views

Last post by POLAND_SPUD
Thu May 01, 2014 9:00 am
hammer valve question

Last post by Gippeto
Replies: 2
by vng21092 » Sat Apr 26, 2014 8:18 am

First post

Is it necessary to have a spring to reset the stem? Are there any downsides to not having the spring? My hammer valve has a pretty good seal, even...

Last post

Is it necessary to have a spring to reset the stem?

Not absolutely necessary, but of particular value with lower pressure(say 1500 psi or less)...

2 Replies

1580 Views

Last post by Gippeto
Sun Apr 27, 2014 9:21 pm

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Pneumatic Cannons

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