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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

1563909 Views

Last post by quinn whitsitt
Fri Feb 09, 2024 2:38 pm
Sketchup Model Library

Last post by mrfoo
Replies: 152
by dewey-1 » Tue Mar 24, 2009 12:12 pm
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Over the last year I have made a lot of CAD drawings for
Pneumatic Launchers.

I have imported several of them into Sketchup format.
Here is the link...

Last post

Bollocks. Dewey put them out in the hope that, and I quote

some of you can make use of these!

There's absolutely nothing wrong with using them,...
152 Replies

751180 Views

Last post by mrfoo
Mon May 20, 2024 11:17 am
Solvent Welding Course Recommended For ALL

Last post by Technician1002
Replies: 46
by sgort87 » Fri Aug 04, 2006 8:18 pm
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Originally posted by DR on the Spudtech forums:

IPEX Solvent Cements ONLINE Course can be found here:

It is recommended that you download and...

Last post

Your earlier post about just scoring the surface, has me wondering if that is why OATEY makes a brush tool that scores the inside of a fitting, and...
46 Replies

408775 Views

Last post by Technician1002
Thu Dec 02, 2010 5:04 pm

Topics

Galvanized and Stainles Fitting Pressure

Last post by inonickname
Replies: 16
by kjjohn » Fri Dec 04, 2009 8:16 pm
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I know that most of McMaster's galvanized and stainless fittings are only rated for 150psi, but I am pretty sure that they can withstand brief bursts...

Last post

I am going to be buying stainless pipes and fittings. For the larger ones I will use screws and o-rings, but on the smaller ones I will be using taps...
16 Replies

4015 Views

Last post by inonickname
Sat Dec 05, 2009 11:31 pm
Paintball semi/auto Sniper Plans - UPDATE x99

Last post by bradisfun
Replies: 103
by Hailfire753 » Sat Oct 13, 2007 7:52 pm
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Hey fellow spudders! (Feel free to skip the text and go straight to the pic) Also Updated 12/4/07 see page 3

Recently I have become interested in...

Last post

sorry bout this but i would like to hear moar bout this thread
103 Replies

64960 Views

Last post by bradisfun
Sat Dec 05, 2009 2:11 am
solenoid valve

Last post by rp181
Replies: 10
by rp181 » Wed Dec 02, 2009 7:02 pm

First post

hey,
Im looking for a solenoid valve, all the ones i have seen online are expensive. It should be sufficient to pilot a .5 QEV (railgun injector)
12v...

Last post

thanks for the links, someone told me about a site that has brass .25 300 PSI ones for 25$

thanks for the suggestions all.

10 Replies

3168 Views

Last post by rp181
Thu Dec 03, 2009 12:17 am
Burst pressure of aluminum pipe

Last post by D_Hall
Replies: 1
by kjjohn » Tue Dec 01, 2009 7:34 pm

First post

Does anyone know the burst pressure of 1.5 sch40 6061-t6 aluminum pipe? Would it be able to withstand 2500psi (upon ignition of a hybrid mix)? Steel...

Last post

ROUGH calculation....

stress = load / area

= Pressure * diameter / (2*wall thickness)

= Pressure * 1.61 / (2*0.145) = 5.55 * Pressure

6061-T6...

1 Replies

5139 Views

Last post by D_Hall
Tue Dec 01, 2009 9:12 pm
thoughts on valve cylinder materials and porting

Last post by MrDEB

by MrDEB » Tue Dec 01, 2009 8:56 am

Am in process of designing an air cannon using a QDV set up. Aquired a large propane tank for free (4 ft tall and about 16 inches diameter).
plan is...

0 Replies

2180 Views

Last post by MrDEB
Tue Dec 01, 2009 8:56 am
Good sized Advanced Cannon Build, Plus ammo Idea

Last post by jimmy101
Replies: 5
by Rob748 » Sun Nov 29, 2009 1:01 pm

First post

Hi everyone, I had a little build I have been running off Hgdt for a few months, Havent had the money to get around to build it, Its Advanced, And Im...

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8 spark gaps seems a bit overkill. 22 long chamber of 4 D pipe ... five or six spark gaps should be more than enough.

Two fans really are not needed...

5 Replies

4339 Views

Last post by jimmy101
Mon Nov 30, 2009 3:07 pm
Sooooo... How's everyone been?

Last post by D_Hall
Replies: 12
by Eddbot » Sat Nov 28, 2009 12:46 am

First post

I'm gone for two months and this is what I find when I check back.

Anyway, I skimmed over all twelve pages of new topics, and wanted to know...

Last post

Actually...they're not...
Before that ring they can;t keep their hands off you...
Once you sign that contract... :shock: :D

Out of the mouth of a...

12 Replies

11029 Views

Last post by D_Hall
Sun Nov 29, 2009 1:32 pm
Has anyone tried a reciprocating piston design like this?

Last post by Ragnarok
Replies: 2
by kozak6 » Fri Nov 27, 2009 8:31 pm

First post

On another forum, a member is experimenting with a DIY air tool.

It works something like this:

It seems like it could be adapted to a...

Last post

Does it really work?
Of course it would. It's the same basics as a steam locomotive, except that the valve and piston have been combined into one....

2 Replies

1655 Views

Last post by Ragnarok
Fri Nov 27, 2009 9:12 pm
GGDT Help (Divide by zero)

Last post by POLAND_SPUD
Replies: 5
by julktyl » Thu Nov 26, 2009 2:48 pm

First post

I'm trying to use GGDT to optimize the chamber volume to a fixed barrel length of 12 but every time I hit optimize it gives me an error that says Run...

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I tried to get rid of all zeros but they are not the problem... it seems that 'generic valve' is the problem here

5 Replies

1989 Views

Last post by POLAND_SPUD
Thu Nov 26, 2009 6:22 pm
New combustion igniter

Last post by Marffy
Replies: 6
by Marffy » Wed Nov 25, 2009 5:30 pm

First post

STORY:
One day i was messing around with this car i made. It had a 3v motor on it. I though hey that motor is pretty weak. so i went to my shop and...

Last post

True, true. But looking at the motor having a constant light come out of the motor makes it look like it has some hope.

The problem is, especially...

6 Replies

2229 Views

Last post by Marffy
Wed Nov 25, 2009 10:51 pm
Break Barrel Idea

Last post by Brian the brain
Replies: 2
by boyntonstu » Mon Nov 23, 2009 10:44 pm

First post

My 3/4 AG works fine as a muzzle loader.

I'm thinking break barrel instead of bolt action breech as the next step.

If the 3/4 copper barrel slipped...

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I've made a couple, yes..
It's my favourite breech loading system.

The trick is you need a really strong hinge.If you would mount the thing in wood,...

2 Replies

1492 Views

Last post by Brian the brain
Tue Nov 24, 2009 1:15 pm
Pneumatic airsoft grenade.

Last post by roboman
Replies: 5
by Marffy » Tue Nov 24, 2009 12:15 am

First post

A modified version of my combustion grenade. A sprinkler valve opens after a certain amount of time after the button is pressed. The valve sends air...

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I'm not saying you can't throw it...I'm just worried about what will happen when it hits the ground. That design could be made to work , but I...

5 Replies

3233 Views

Last post by roboman
Tue Nov 24, 2009 11:40 am
BL-520 Fuel metering device

Last post by CS
Replies: 7
by rikukiakuchiki777 » Tue May 05, 2009 11:46 pm

First post

Is anyone able to explain how the metering device found on the BL-520 works? ( ) There is a brief explanation located at the above link, however it...

Last post

Pressure gauge and a regulator. *spoonfeed*

7 Replies

12723 Views

Last post by CS
Tue Nov 24, 2009 2:44 am
Making my second tennis ball mortar, Need help!

Last post by Dtaktics
Replies: 11
by Dtaktics » Sun Nov 22, 2009 11:33 pm

First post

Alright, this is my first post so be easy on me. I want to make a second tennis ball mortar. My last one was a POS to say the least. It was made out...

Last post

thats how i've always done it. it would be kinda difficult if you couldnt take the cap off wouldnt it?

Alright thanks that makes sense.

11 Replies

3695 Views

Last post by Dtaktics
Mon Nov 23, 2009 11:36 pm
For those of you Who like math and calculations....

Last post by jeepkahn
Replies: 13
by jeepkahn » Tue Jul 28, 2009 2:39 pm

First post

I know some folks on here like to build spreadsheets, extrapolate formulas, write code, and crunch data in general...

Here are some things that...

Last post

Geez, i'd nearly forgotten about this post....

In retrospect, some of my nomenclature was incorrect or confusing...And I may have been drunk when I...

13 Replies

4527 Views

Last post by jeepkahn
Sat Nov 21, 2009 4:12 pm
When Smoothbore is Superior to Rifling.

Last post by ThegunGuy
Replies: 16
by boyntonstu » Mon Nov 02, 2009 8:52 pm
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When Smoothbore is Superior to Rifling.

The APDS was initially the main design of KE penetrator. The logical progression was to make the shot longer...

Last post

I know that, but I guess that the way I worded it sounds like that was what I meant, I was just giving an example. But with $500 and a some paperwork...
16 Replies

6300 Views

Last post by ThegunGuy
Fri Nov 20, 2009 2:06 pm
Decent Drawings

Last post by kenbo0422
Replies: 13
by kenbo0422 » Fri Oct 23, 2009 7:31 am

First post

Does anyone know of any sites where I can get some good drawings of rifles, etc? I am looking more for tech drawings with some dimensions to refer to...

Last post

Most of the photographs of guns I've seen are at an angle, to make it 'prettier', I suppose. That tends to throw you off when it comes to getting a...

13 Replies

4464 Views

Last post by kenbo0422
Thu Nov 19, 2009 6:26 am
I've Been Thinking...Barrel Insert's

Last post by c11man
Replies: 11
by jrrdw » Wed Nov 18, 2009 4:27 pm

First post

Sabots. Instead of using a sabot why not a barrel insert with a twist lock at the muzzle to hold it in. Could turn a general barrel into a multi...

Last post

nice moon. i have do this on my brass over under, thin tube converts from bearings/slugs to pellets

11 Replies

6241 Views

Last post by c11man
Thu Nov 19, 2009 12:30 am
Neat push button pilot

Last post by Major Collins
Replies: 17
by MRR » Sat May 16, 2009 11:10 am
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Today I worked on my little metal gun to improve accuracy and build something unexpected.

I started with the idea of a hammer valve, bought some...

Last post

wow thats beautiful im jealous :)
17 Replies

12270 Views

Last post by Major Collins
Wed Nov 18, 2009 7:11 am
high tech air cannon in progress

Last post by MrDEB
Replies: 44
by MrDEB » Fri Nov 06, 2009 10:01 am
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been designing an air cannon for a local high school student to enter into a competition that entails accuracy (targets at 30,60 and 90yards) as well...

Last post

The schematic I posted does need a second sensor for the wind direction. Thinking about a ps2 mouse method of direction sensing.
I like the dry ice...
44 Replies

15689 Views

Last post by MrDEB
Mon Nov 16, 2009 10:30 am
Spud Gun Handle?

Last post by john bunsenburner
Replies: 19
by Woody » Thu Nov 12, 2009 2:11 pm
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What could I use as a handle for my spud gun? I know wye fittings make decent handles. Would that be best to use or are there any good alternatives...

Last post

why not carve it out of wood, a simple grip isn't too hard. Or use polymorph, thats what the grip on the HEAL by Ragnarok is made of.
19 Replies

10091 Views

Last post by john bunsenburner
Sat Nov 14, 2009 6:20 am
Help with first combustion

Last post by JDP12
Replies: 3
by Marffy » Fri Nov 13, 2009 8:23 pm

First post

i was thinking of making a combustion but i need some input on what to use.

I was thinking:
ABS chamber and barrel
PVC or wood stock
4inch chamber...

Last post

Welcome to the forum.

There is a ton of good information here -

that will be more than enough to get you started.

Good luck!

3 Replies

1810 Views

Last post by JDP12
Fri Nov 13, 2009 10:19 pm
Need a burst pressure calculation

Last post by AdamD
Replies: 5
by Fnord » Sat Jun 30, 2007 10:35 am

First post

I remember someone a while back saying they had the formula for calculating the burst pressure of pipe when given specific dimentions.

I can't seem...

Last post

Hi,
The formula is available at along with other useful tools and information

5 Replies

10468 Views

Last post by AdamD
Wed Nov 11, 2009 3:58 am
easy way to cut pvc

Last post by jrrdw
Replies: 35
by pat123 » Thu Sep 06, 2007 2:55 pm
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if you tie a string between two things and slide the pipe back and forth it will cut the pvc a lot faster then you could with a hacksaw

Last post

@metalmeltr

See what happens when you kick up old topics with nothing new. You get your post edited in a embarrassing way. This is the second time...
35 Replies

16075 Views

Last post by jrrdw
Mon Nov 09, 2009 9:28 pm
Threading question

Last post by velocity3x
Replies: 18
by Demon » Fri Nov 06, 2009 4:01 pm
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I just have little question here;

Can i get a 3 inches long, 1/2 plumbing pipe threaded female at one end and male at the other one?

My rona has a...

Last post

Have a machinist make the part you describe. It's nothing to make this part from 1 diameter rod stock. Quick easy job and you'll have exactly what...
18 Replies

4587 Views

Last post by velocity3x
Mon Nov 09, 2009 9:09 pm

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