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 80 users online :: 6 registered, 0 hidden and 74 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

6mm semi - added trigger & mag!

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

Unread postAuthor: littlebro05 » Sun Jun 22, 2008 4:58 pm

Ragnarok wrote:
littlebro05 wrote:I didn't realise it before 0.5L at 7.5bar (I think about 50psi'ish) 95 shots.

Not quite. 7.5 bar is just under 110 psi. Still very impressive, but not quite as efficent as you thought.


Haha, oh well I was totally off, about Ant's Gun how much pressure can a plastic coke bottle handle before it explodes. Just so I know not to pump it too much or else boom! possible injuries. Well yeah cool
  • 0

It's Nerf or Nothing.

Don't start crying when I play this as my hobby, Paintball, Airsoft and Nerf are equally good hobbies, except you can play Nerf in public. Good day! Hmph!
User avatar
littlebro05
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 417
Joined: Wed Oct 17, 2007 5:04 am
Reputation: 1

Unread postAuthor: Antonio » Sun Jun 22, 2008 5:14 pm

littlebro05 wrote:Haha, oh well I was totally off, about Ant's Gun how much pressure can a plastic coke bottle handle before it explodes. Just so I know not to pump it too much or else boom! possible injuries. Well yeah cool


Well I am telling you its good man! I mean you can even pump it up with a bikepump or something. Oh yeah I did testing at what pressure coke bottles explode. The think walled ones (1.5L) blows at 23 bar, I am not sure about the thinwalled ones. I once did blow up a thickwalled 1.5 liter bottle bc I put fuel and acetone in it for other use. This made the bottom really weak, and while I was shooting the bottom shot off. The bad thing was that I was using the bottle as stock:S So yeah never put anything into a bottle except air, so you know what ur handling (btw the bottle with weak bottom was pumped to only 8 bars).
  • 0

User avatar
Antonio
Colonel
Colonel
 
Posts: 508
Joined: Sun Aug 13, 2006 2:38 pm
Reputation: 0

Unread postAuthor: Mr.Sandman » Wed Jun 25, 2008 2:13 pm

is it possible to make an adapter for co2 work with this because ive heard that high pressure c02 is more dense than air and will give you a faster shot. but even so you could make a hammer valve like ant and have an automatic :D

edit: wow i just realized how bad my punctuation is. i even forgot to use spellcheck :shock:
  • 0

Last edited by Mr.Sandman on Wed Jun 25, 2008 2:16 pm, edited 1 time in total.
User avatar
Mr.Sandman
Donating Member
Donating Member
 
Posts: 762
Joined: Fri Mar 28, 2008 9:10 am
Country: Antarctica (aq)
Reputation: 0

Unread postAuthor: Carlman » Wed Jun 25, 2008 2:15 pm

Mr.Sandman wrote:is it possible to make an adapter for co2 work with this because ive heard that high pressure c02 is more dense than air and will give you a faster shot. but even so you could make a hammer valve like ant and have an automatic :D


given the same pressure air will give more powerful shot over c02.

you heard wrong. :D
  • 0

Image
Aussie spudders unite!!
User avatar
Carlman
Major General
Major General
 
Posts: 1618
Joined: Sat Nov 24, 2007 1:18 am
Location: Western Australia
Reputation: 0

Unread postAuthor: Mr.Sandman » Wed Jun 25, 2008 2:19 pm

Carlman wrote:
Mr.Sandman wrote:is it possible to make an adapter for co2 work with this because ive heard that high pressure c02 is more dense than air and will give you a faster shot. but even so you could make a hammer valve like ant and have an automatic :D


given the same pressure air will give more powerful shot over c02.

you heard wrong. :D



thanks for the info. I will now go hit myself with a hammer :x
  • 0

User avatar
Mr.Sandman
Donating Member
Donating Member
 
Posts: 762
Joined: Fri Mar 28, 2008 9:10 am
Country: Antarctica (aq)
Reputation: 0

Unread postAuthor: MrCrowley » Wed Jun 25, 2008 2:47 pm

Because CO2 is denser, it is heavier then air. Meaning it will travel slower then air and therefore be less powerful given both have been applied the same amount of energy.
  • 0

User avatar
MrCrowley
Moderator
Moderator
 
Posts: 10207
Joined: Fri Jun 23, 2006 10:42 pm
Location: Auckland, New Zealand
Country: New Zealand (nz)
Reputation: 4

Unread postAuthor: Antonio » Wed Jun 25, 2008 4:17 pm

MrCrowley wrote:Because CO2 is denser, it is heavier then air. Meaning it will travel slower then air and therefore be less powerful given both have been applied the same amount of energy.


Doesn't co2 expand at a faster rate though? And you are talking about the same energy, but that doesnt mean that they have the same pressure right? Co2 doesnt need a regulator.
  • 0

User avatar
Antonio
Colonel
Colonel
 
Posts: 508
Joined: Sun Aug 13, 2006 2:38 pm
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: THUNDERLORD » Sun Dec 07, 2008 9:00 pm

I was thinking about this old link: how- to refillable co2 cartridges
Anyway, I was thinking of the refillable co2 cart. except the round end would be sawed off and the shrader with internals removed, Would make the blow-forward chamber encasing the spring and bolt.

I was thinking a bicycle tire fill (valve modded slightly) would be attached onto the shrader of the modified refillable co2 cart. (blow forward bolt case).

I was wondering if the tire fill was upside down or inverted and liquid co2 entered the blow forward bolt, couldn't a certain spring be used that would remain closed until the co2 vaporizes (thus expanding and pulsing the bolt)?

Hope I haven't rambled too much, but I don't have much time right now.
Thanks :wink: I'll have to check back later. 8)
  • 0

-----SPEED,STRENGTH, AND ACCURACY.-----
"Procrastination" is five syllables for "Sloth".
Theopia 8)
Born To Be Alive!

THUNDERLORD
Major General
Major General
 
Posts: 1264
Joined: Fri Mar 28, 2008 1:42 pm
Reputation: 0

Unread postAuthor: Young » Fri Dec 12, 2008 8:07 am

I believe I messaged you on youtube about this, if you dont mind may I try this and tweak some of the design?
  • 0

User avatar
Young
Private
Private
 
Posts: 20
Joined: Sat Oct 25, 2008 6:06 am
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Fri Dec 12, 2008 9:33 am

I believe I replied to your msg, and tweak to your heart's content ;)
  • 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: kuya » Tue Dec 16, 2008 9:06 pm

Whats the diametre of the Syringe and how stiff is the spring? Im thinking of making a metal breech exactly the same. Im planning to make the spring quite stiff in order to have more pressure build up inside the chamber and blow off a more powerful shot. Will this work or will the gas just take longer to come out (8 gram n2o setup).
  • 0


kuya
Private First Class
Private First Class
 
Posts: 27
Joined: Tue Jan 15, 2008 12:24 am
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Wed Dec 17, 2008 2:43 am

The syringe diameter was far too great for my purposes, you could get by with 1/2" diameter, especially if you're using high pressure.
  • 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: kuya » Wed Dec 17, 2008 3:42 am

Half Inch Diameter? That seems a bit small considering the OD of my barrel. But your the master =P. I just dislike tampering with small things lol, but I have to put up with it for this hobby =].
  • 0


kuya
Private First Class
Private First Class
 
Posts: 27
Joined: Tue Jan 15, 2008 12:24 am
Reputation: 0

Unread postAuthor: Ragnarok » Wed Dec 17, 2008 4:00 am

kuya wrote:Half Inch Diameter? That seems a bit small considering the OD of my barrel.

If your barrel diameter is larger than Jack's, you will need to scale that size, but roughly twice the barrel ID should easily be sufficient for relatively small bores like this.

Larger sizes of blow forward bolt probably won't need quite that much.
  • 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 » Wed Dec 17, 2008 5:32 am

It's a question of spring stiffness really. A weak spring doesn't need a big piston at all, much less if used in conjunction with an efficient valve.
  • 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

PreviousNext

Return to BB/Airsoft/Pellet Gun Database

Who is online

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

Reputation System ©'