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 41 users online :: 6 registered, 0 hidden and 35 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

Weird pneumatic

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
Sponsored 
  • Author
    Message

Weird pneumatic

Unread postAuthor: drunpal » Wed Nov 24, 2010 9:52 am

Hey i am new here and (sorry bad English) i am going to show you my lastest pneumatic gun that i have made. It uses valve that i havent seen here, there is a piston connected to the barrel and when you pull the barrel backwards, the air goes to the barrel from holes in that are in the barrel.

Shooting vid here.

[youtube]http://www.youtube.com/watch?v=469hzctgCFg[/youtube]
[youtube]http://www.youtube.com/watch?v=PKGer_NAspU[/youtube]


Edited by jrrdw, double post, embedded video.

Update....................................................................................

Now i added stock in the gun, painted the gun and did some more shooting. It can shoot a nail trough both sides of cardboard box.
  • 0

Attachments
a painetykistö.jpg
a painetykki.jpg
a valve closed.jpg
a valve open.jpg
a painetykki2.jpg
The whole gun
aa tukki.jpg
aa tykki.jpg
Added stock and painted the gun.
aa tykki2.jpg
aa tykkieestäpäin.jpg
Shooting at the cam.
Last edited by drunpal on Thu Nov 25, 2010 10:32 am, edited 2 times in total.
User avatar
drunpal
Private
Private
 
Posts: 10
Joined: Mon Nov 22, 2010 10:28 am
Reputation: 0

Unread postAuthor: SpudFarm » Wed Nov 24, 2010 10:05 am

This kind of reminds me of Tech's QDV..

The first thing that fell to my mind though is a external magazine for BBs that fall in when you push the barrel forward. Then they are fired when the barrel is pulled backwards, repeat and you have a rough semi..

Pretty clever IMO.
  • 0

"Made in France"
- A spud gun insurance.
User avatar
SpudFarm
Donating Member
Donating Member
 
Posts: 2563
Joined: Sat Nov 04, 2006 9:39 am
Location: Norway Trondheim area
Reputation: 0

Unread postAuthor: Technician1002 » Wed Nov 24, 2010 10:16 am

It looks like it has to push against the chamber pressure to open like a poppet valve. It would be impossible to use in larger sizes at high pressure.

I wonder if it blows off o rings at high pressure. Due to the chamber, I doubt it is used at very high pressure.

It does provide a large valve seat for a smaller barrel so it's rate of opening is very high and would open a gap with more area than the cross section of the barrel in very little time. It would be an extremely fast opening valve due to that.
  • 0

User avatar
Technician1002
Chief of Staff
Chief of Staff
 
Posts: 5190
Joined: Sat Apr 04, 2009 11:10 am
Reputation: 14

Unread postAuthor: drunpal » Wed Nov 24, 2010 10:18 am

Another vid here, very low psi in both videos because of my handpump... ... i guess under 25 psi because i could push the side of the bottle down with my finger.

[youtube]http://www.youtube.com/watch?v=QbN3V6L_91o[/youtube]


Yes i am sure it would not work with high pressure, it pushes back even with as small pressure as that. Still good enough for me

Edited by jrrdw, double post, embedded video.
  • 0

User avatar
drunpal
Private
Private
 
Posts: 10
Joined: Mon Nov 22, 2010 10:28 am
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Wed Nov 24, 2010 10:56 am

Add an electric motor driving an eccentric cam and you have the potential for full auto ;)

Image
  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Unread postAuthor: matti » Wed Nov 24, 2010 5:35 pm

welcome to the forum and for the cannon.. well, at least it works :D
the idea is good but the implementation is a bit poor.
  • 0

User avatar
matti
2nd Lieutenant
2nd Lieutenant
 
Posts: 232
Joined: Tue Oct 04, 2005 1:01 pm
Reputation: 9

Unread postAuthor: SpudFarm » Wed Nov 24, 2010 6:38 pm

but the implementation is a bit poor.


How do you test a concept you haven't seen working before then? I would certainly end up with a prototype much like this if I planned to do a bigger build upon the same concept later.
  • 0

"Made in France"
- A spud gun insurance.
User avatar
SpudFarm
Donating Member
Donating Member
 
Posts: 2563
Joined: Sat Nov 04, 2006 9:39 am
Location: Norway Trondheim area
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: matti » Thu Nov 25, 2010 11:55 am

SpudFarm wrote:
but the implementation is a bit poor.


How do you test a concept you haven't seen working before then? I would certainly end up with a prototype much like this if I planned to do a bigger build upon the same concept later.


He didnt say that it was a prototype and with just a little work it could be much better.
if thats a prototype, then its ok :D
  • 0

User avatar
matti
2nd Lieutenant
2nd Lieutenant
 
Posts: 232
Joined: Tue Oct 04, 2005 1:01 pm
Reputation: 9

Unread postAuthor: Selador » Thu Nov 25, 2010 2:10 pm

matti wrote:He didnt say that it was a prototype and with just a little work it could be much better.
if thats a prototype, then its ok :D


It's -more- than ok, even if it is not a prototype.

Go back and look again, and think about it before you make a judgement.

It was obviously built almost completely from things found about the house.

The builder obviously actually THOUGHT about what they were doing.

They didn't just stick things together because it looked like they would work. They had to actually think about how, and maybe more importantly, WHY that valve works. And then build that valve with what was available.

Putting something like this together, (and have it actually work)... With all the "right" materials... Because one has access to, and can afford them... Is difficult enough.

To have put it together and gotten it working, with what the builder used, is very impressive.

:D
  • 0

If you can't fix it, you don't own it.

Selador
2nd Lieutenant
2nd Lieutenant
 
Posts: 213
Joined: Wed Nov 03, 2010 9:44 pm
Reputation: 0

Unread postAuthor: wyz2285 » Thu Nov 25, 2010 4:57 pm

nice work :) i like it, the power looks good 8) .Try use a blowgun
  • 0

User avatar
wyz2285
Major General
Major General
 
Posts: 2244
Joined: Sat Mar 06, 2010 7:50 am
Location: Porto, Portugal
Country: Portugal (pt)
Reputation: 12

Return to Pneumatic Cannon Database

Who is online

Registered users: Bing [Bot], Exabot [Bot], Google [Bot], Google Adsense [Bot], MSNbot Media, Yahoo [Bot]

Reputation System ©'