Login    Register
User Information
Username:
Password:
We are a free and open
community, all are welcome.
Click here to Register
Sponsored
Who is online

In total there are 30 users online :: 3 registered, 0 hidden and 27 guests


Most users ever online was 218 on Wed Dec 07, 2016 6:58 pm

Registered users: Bing [Bot], Exabot [Bot], Google [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

"In the world of spuds today"

A place to ask general spud cannon related questions.
Sponsored 
  • Author
    Message

Re: "In the world of spuds today"

Unread postAuthor: farcticox1 » Mon Mar 04, 2019 5:06 am

A 3/2 lever valve connected Normally Open as I fill through the valve.
  • 0

User avatar
farcticox1
Brigadier General
Brigadier General
 
Posts: 883
Joined: Sun Mar 31, 2013 12:37 pm
Country: Canada (ca)
Reputation: 180

Re: "In the world of spuds today"

Unread postAuthor: jackssmirkingrevenge » Mon Mar 25, 2019 1:13 am

When you want to sell your spudgun but Facebook is anti-gun, one has to get creative :roll:

Image
  • 1

hectmarr wrote:You have to make many weapons, because this field is long and short life
User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 25461
Joined: Thu Mar 15, 2007 11:28 pm
Country: Chad (td)
Reputation: 255

Re: "In the world of spuds today"

Unread postAuthor: farcticox1 » Mon Mar 25, 2019 4:09 am

  • 0

User avatar
farcticox1
Brigadier General
Brigadier General
 
Posts: 883
Joined: Sun Mar 31, 2013 12:37 pm
Country: Canada (ca)
Reputation: 180

Re: "In the world of spuds today"

Unread postAuthor: hectmarr » Mon Mar 25, 2019 8:51 am

I spit out an olive pit with your mouth and I'm breaking the law ... state bureaucracy :x
  • 0

Weapons do not exist, they are built. This hobby is a science - totally procedural art.
User avatar
hectmarr
Colonel
Colonel
 
Posts: 588
Joined: Sat May 07, 2016 3:49 pm
Location: Yaren
Country: Nauru (nr)
Reputation: 162

Re: "In the world of spuds today"

Unread postAuthor: Potato Demon » Wed Mar 27, 2019 9:20 am

I just launch them on my farm. Loads of space and it echoes nicely. I ran into a problem on the way though, A FLIPPING CHECK-STOP! Cops didn’t notice the tater guns or didn’t care fortunately.
  • 0

Last edited by Potato Demon on Sun Mar 31, 2019 11:06 pm, edited 1 time in total.
The world is the problem, the atomic bomb is the answer!

Potato Demon
Specialist
Specialist
 
Posts: 58
Joined: Tue Oct 16, 2018 4:22 pm
Country: Canada (ca)
Reputation: 3

Re: "In the world of spuds today"

Unread postAuthor: farcticox1 » Sun Mar 31, 2019 4:32 pm

Anybody know or have information on airsoft operating pressures? Internal barrel pressure at time of firing I mean. Can't seem to find any figures on this, maybe secret. I would be interested in spring vs electric vs Co2 vs Hpa ?
  • 0

User avatar
farcticox1
Brigadier General
Brigadier General
 
Posts: 883
Joined: Sun Mar 31, 2013 12:37 pm
Country: Canada (ca)
Reputation: 180

Re: "In the world of spuds today"

Unread postAuthor: jackssmirkingrevenge » Mon Apr 01, 2019 3:58 am

farcticox1 wrote:Anybody know or have information on airsoft operating pressures? Internal barrel pressure at time of firing I mean.


Not really a secret.

For all intents and purposes, spring and electric guns run on the same principle in terms of firing, the only difference is that in the latter case it's an electric motor that cocks the piston through a gearbox instead of having it manually cocked.

flash animation elucidating the complex nature of piston airgun dynamics, determining the barrel pressure curve is a more challenging undertaking.

HPA replicas would be the easiest to model, they are usually run at 70-120 psi from the regulator so here is a GGDT model of a typical setup:

Image

As you can see peak barrel pressure does not exceed 30 psi.

Using CO2 that has a much higher chamber pressure, this is what it would look like in an airsoft pistol:

Image

To achieve a similar velocity with a short barrel, barrel pressure is higher than the HPA example however maximum barrel pressure is just under 60 psi even though we're at 850 psi at the chamber.
  • 1

hectmarr wrote:You have to make many weapons, because this field is long and short life
User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 25461
Joined: Thu Mar 15, 2007 11:28 pm
Country: Chad (td)
Reputation: 255

Re: "In the world of spuds today"

Sponsored

Sponsor
 


Re: "In the world of spuds today"

Unread postAuthor: wyz2285 » Mon Apr 01, 2019 4:24 am

Read somewhere around here spring airsoft guns can reach 300 psi in the chamber, might be legit since it's such a low volume compared to HPA and CO2
  • 0

CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
User avatar
wyz2285
Major General
Major General
 
Posts: 2357
Joined: Sat Mar 06, 2010 7:50 am
Location: Porto, Portugal
Country: Portugal (pt)
Reputation: 23

Re: "In the world of spuds today"

Unread postAuthor: jackssmirkingrevenge » Mon Apr 01, 2019 4:26 am

wyz2285 wrote:a low volume compared to HPA and CO2


There's also the heat factor to consider given the sudden compression.
  • 0

hectmarr wrote:You have to make many weapons, because this field is long and short life
User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 25461
Joined: Thu Mar 15, 2007 11:28 pm
Country: Chad (td)
Reputation: 255

Re: "In the world of spuds today"

Unread postAuthor: wyz2285 » Mon Apr 01, 2019 4:31 am

True, it is pretty warm at the nozzle. Once tested a M150 gearbox it was so loud I thought it dieseled :lol: turns out just hard cylinder head and piston.
Any guess on the peak pressure? I tried to measure it with a gauge but the recorded pressure was too low probably duo to leaks and dead volume between the nozzle and gauge.
  • 0

CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
User avatar
wyz2285
Major General
Major General
 
Posts: 2357
Joined: Sat Mar 06, 2010 7:50 am
Location: Porto, Portugal
Country: Portugal (pt)
Reputation: 23

Re: "In the world of spuds today"

Unread postAuthor: Anatine Duo » Mon Apr 01, 2019 7:21 am

I think there is other stuff going on that makes it hard to measure peak pressure. There might have been part of a thread here about it. Pressure gauges need time to indicate, and moving pistons create pressure spikes that last for very short times. I think to measure momentary pressure there are strain gauges etc.
  • 0

User avatar
Anatine Duo
Sergeant First Class
Sergeant First Class
 
Posts: 130
Joined: Sat Feb 01, 2014 11:16 am
Country: Canada (ca)
Reputation: 18

Re: "In the world of spuds today"

Unread postAuthor: Brian the brain » Fri Apr 05, 2019 1:36 pm

ITWOST I learned there is no such thing as potato cannons on the internet these days according to this "well informed" Vice reporter..https://www.google.com/url?sa=i&source= ... 5550954155
  • 1

Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
User avatar
Brian the brain
Moderator
Moderator
 
Posts: 3519
Joined: Mon Dec 05, 2005 2:06 am
Location: Holland
Country: Netherlands (nl)
Reputation: 63

Re: "In the world of spuds today"

Unread postAuthor: jackssmirkingrevenge » Fri Apr 05, 2019 2:10 pm

It puts the power of death in your hands and feels awesome, but it also puts the power of death in your hands. And that's a kind of thing 17-year-old versions of me don't need.


There is no virtue in being a harmless man, this sort of thinking is symptomatic of the ongoing problem with masculinity in the Western world.

That being said, the google data does seem to be true in terms of a lack of search interest, at least in the Anglosphere. Here it is for "spud gun":

Image

This incident in Australia linked to in the article is quite horrific, it definitely trumps "frog boy" as a cautionary tale:

While checking if the projectile, a rubber bike handle grip wrapped in electrical tape, still worked, Mitchell fired a shot that hit Daniel in the face.

He told police he thought Daniel had stepped clear of the gun at the time.

The projectile lodged into Daniel’s face and he was rushed to hospital.

He died eight days later.


This "well informed" Vice reporter certainly has some interesting opinions...

Shooting a potato cannon is a lot like masturbating that very first time.


hmm...
  • 0

hectmarr wrote:You have to make many weapons, because this field is long and short life
User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 25461
Joined: Thu Mar 15, 2007 11:28 pm
Country: Chad (td)
Reputation: 255

Re: "In the world of spuds today"

Unread postAuthor: farcticox1 » Mon Apr 08, 2019 7:28 pm

farcticox1 wrote:Making a super simple 0.177 BB pistol, going to be muzzle loading, have some parts already, waiting for 1/4" Ebay QEV and compression fitting to attach barrel. :D

001 (1).jpg


Made a new M5 port on the side of the trigger valve so I can keep the top profile low. :idea:

001 (2).jpg


Main 02.jpg


Just got the 1/4" QEV from Ebay and it hasa 3/8 exhaust port :shock:
  • 0

User avatar
farcticox1
Brigadier General
Brigadier General
 
Posts: 883
Joined: Sun Mar 31, 2013 12:37 pm
Country: Canada (ca)
Reputation: 180

Re: "In the world of spuds today"

Unread postAuthor: jackssmirkingrevenge » Tue Apr 09, 2019 5:52 am

No one:


Chinese QEV manufacturers: ¯\_(ツ)_/¯
  • 0

hectmarr wrote:You have to make many weapons, because this field is long and short life
User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 25461
Joined: Thu Mar 15, 2007 11:28 pm
Country: Chad (td)
Reputation: 255

PreviousNext

Return to General Spud Cannon Related

Who is online

Registered users: Bing [Bot], Exabot [Bot], Google [Bot]

Reputation System ©'