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 65 users online :: 5 registered, 0 hidden and 60 guests


Most users ever online was 155 on Mon Aug 15, 2016 1:40 am

Registered users: Bing [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

Self powered pmeumatic gun

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
Sponsored 
  • Author
    Message

Unread postAuthor: Northir » Mon Oct 12, 2009 3:48 pm

inonickname wrote:You would be surprised how much energy it takes to stop someone dead. Unless you have a powerful gun, it's better to defend your home with a knife.


i dont think you can make anything that powerful with a sprinkler valve, but i wouldnt be surprised if my golfball cannon was powerful enough to kill or seriously hurt some one, obviously a piston valve and large bore launcher
  • 0

User avatar
Northir
Staff Sergeant
Staff Sergeant
 
Posts: 123
Joined: Sun Sep 06, 2009 3:04 am
Reputation: 0

Unread postAuthor: Ragnarok » Mon Oct 12, 2009 4:27 pm

Northir wrote:i dont think you can make anything that powerful with a sprinkler valve.

Don't fool yourself, humans are actually pretty frail when you look at it.

I wouldn't write off anything other than "minis" as having the potential to be fatal. Evidence suggests that as little as about 4 Joules can be fatal, if it hits a person in the wrong way. It's unlikely to be fatal (and especially not instantly fatal), but it can kill.

Bear that in mind whenever you pick up a cannon.

However, it would take a fairly substantial sized spudgun (with the right projectile) to have the energy and penetration to be reliably lethal.
You cannot be sure either way whether a hit on a person will be fatal or safe.
  • 0

Does that thing kinda look like a big cat to you?
User avatar
Ragnarok
Chief of Staff
Chief of Staff
 
Posts: 5339
Joined: Tue Dec 19, 2006 8:23 am
Location: The UK
Reputation: 8

Unread postAuthor: jackssmirkingrevenge » Mon Oct 12, 2009 4:33 pm

I have no doubt that a close range head shot from a reasonably sized sprinkler valved marble gun operating at ordinary compressor pressures can easily be fatal, but such discussion is bordering on breaking forum rules so it should end here.

In a nutshell, yes they can be lethal, so use them responsibly!
  • 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: Northir » Mon Oct 12, 2009 8:50 pm

Anyways back to the topic, anyone know where to find a quieter 12V compressor mines loud as hell, i figure i could attach the loud one to the sniper and the quieter one to my cannon, ive been looking around and i cant really find DB ratings
  • 0

User avatar
Northir
Staff Sergeant
Staff Sergeant
 
Posts: 123
Joined: Sun Sep 06, 2009 3:04 am
Reputation: 0

Unread postAuthor: POLAND_SPUD » Mon Oct 12, 2009 9:08 pm

I donn't think there are quiet ones... you could put lots of foam around yours but that would probably cause overheating and won't be very effective...

after I've seen this video (skip first 13 minutes... and have a look at 17:40 too :wink: ) I thought that you could probably cut a fridge compressor case open and remove the compressor itself... then attach it directly to a small gas engine for model planes...
  • 0

Children are the future

unless we stop them now
User avatar
POLAND_SPUD
Chief of Staff
Chief of Staff
 
Posts: 5405
Joined: Sat Oct 13, 2007 4:43 pm
Country: Israel (il)
Reputation: 10

Unread postAuthor: Northir » Mon Oct 12, 2009 9:23 pm

i was thinking about that too, since i cant get that compressor that i have to work, tried to replace the starter and all the other electronic component but still nothin, so im going to drain the oil and cut it open
  • 0

User avatar
Northir
Staff Sergeant
Staff Sergeant
 
Posts: 123
Joined: Sun Sep 06, 2009 3:04 am
Reputation: 0

Unread postAuthor: nakarti » Tue Oct 13, 2009 3:56 pm

Wouldn't you want the quiet one on the _sniper_ and the loud one on the _cannon_ ?

Let's say paintball, since that's about the diameter he built(ignore the home defense crap and felon comments) he wants good range, so a longer barrel, and to be unnoticed, so a quiet pump.

I had pretty good success with high pressure(200psi) and small tank(~3-4cu in.) on a 3/4" 5ft barrel (20psi at the muzzle for anybody doing the math,) and have considered hand pumping it to see what pressure I get. Definite stealth.

Steel chamber, if you're wondering, though I want to redo with copper(easier to seal with solder than seal with threads.)

Smaller pumps tend to be quieter(or at least less audible) and refridgerator compressors are packed in a filled canister, aren't they?
  • 0


nakarti
Private
Private
 
Posts: 10
Joined: Tue Sep 16, 2008 10:51 pm
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: boyntonstu » Tue Oct 13, 2009 8:33 pm

Technician1002 wrote:Very nice pump. One that actualy works. It doesn't have the plastic gear noise of most emergency pumps.


I wrote him and this is the pump:

http://www.harborfreight.com/cpi/ctaf/d ... mber=96068

BoyntonStu
  • 0

User avatar
boyntonstu
Brigadier General
Brigadier General
 
Posts: 1039
Joined: Sun Jun 28, 2009 8:59 am
Reputation: 0

Unread postAuthor: Technician1002 » Tue Oct 13, 2009 9:29 pm

boyntonstu wrote:
Technician1002 wrote:Very nice pump. One that actualy works. It doesn't have the plastic gear noise of most emergency pumps.


I wrote him and this is the pump:

http://www.harborfreight.com/cpi/ctaf/d ... mber=96068

BoyntonStu


Thanks. It is a direct drive which is why the noise of the gears is missing. I downloaded the owners manual. The duty cycle with my large cannon would provide about 2 shots an hour. :D
  • 0

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

Unread postAuthor: Northir » Wed Oct 14, 2009 12:17 pm

awesome, i think ill pick that one up, and as for nakarti's question i use the cannon more and dont want that rattling sound in my head while i charge the tank
  • 0

User avatar
Northir
Staff Sergeant
Staff Sergeant
 
Posts: 123
Joined: Sun Sep 06, 2009 3:04 am
Reputation: 0

Unread postAuthor: eriko1337 » Thu Feb 04, 2010 3:46 pm

really awesome, dont really get how it works but seems really good =)
  • 0


eriko1337
Private First Class
Private First Class
 
Posts: 30
Joined: Mon Feb 01, 2010 2:55 pm
Reputation: 0

Previous

Return to Pneumatic Cannon Discussion

Who is online

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

Reputation System ©'