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 69 users online :: 5 registered, 0 hidden and 64 guests


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

Registered users: Bing [Bot], farcticox1, Gussmoore, MSNbot Media, Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

Mitcho's BB Rifle idea

This area is for the discussion of BB or airsoft sub machine guns, and or other small arms such as pellets.
Sponsored 
  • Author
    Message

Unread postAuthor: al-xg » Fri Jul 13, 2007 6:46 am

With the 6mm barrel on my copper QEV launcher GGDT says they go supersonic but i always thought that just using air at normal temperatures wouldn't alow the projectiels to go so fast (but maybe because of dead volume ?)

.12g BB just disapear when fired at 200psi and don't hit the target... :? They only go where they are aimed at when 3or more are sort at a time.
  • 0

User avatar
al-xg
Colonel
Colonel
 
Posts: 643
Joined: Fri Jan 19, 2007 12:29 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Fri Jul 13, 2007 7:11 am

al-xg wrote:With the 6mm barrel on my copper QEV launcher GGDT says they go supersonic but i always thought that just using air at normal temperatures wouldn't alow the projectiels to go so fast (but maybe because of dead volume ?)


have a look here :wink:
  • 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: potatoflinger » Fri Jul 13, 2007 7:36 am

A lot of high-end bb guns can go supersonic, one from Cabelas can go up to 1,600 fps, so it is possible that you could go supersonic, but it would decelerate really fast, not to mention you would have to use insane pressure.
  • 0

User avatar
potatoflinger
Brigadier General
Brigadier General
 
Posts: 1136
Joined: Thu Nov 02, 2006 3:26 pm
Location: Maryland
Reputation: 1

Unread postAuthor: al-xg » Fri Jul 13, 2007 8:04 am

:D yay! im supersonic then !!!! wooohh :wink:
Ill be getting the parts for semi auto before next week so i might pick up the 6mm barrel again.
  • 0

User avatar
al-xg
Colonel
Colonel
 
Posts: 643
Joined: Fri Jan 19, 2007 12:29 pm
Reputation: 0

Unread postAuthor: potatoflinger » Fri Jul 13, 2007 8:18 am

al-xg wrote::D yay! im supersonic then !!!! wooohh :wink:
Ill be getting the parts for semi auto before next week so i might pick up the 6mm barrel again.

Just because some guns can go supersonic doesn't mean that yours will, it just means that it is possible.
  • 0

User avatar
potatoflinger
Brigadier General
Brigadier General
 
Posts: 1136
Joined: Thu Nov 02, 2006 3:26 pm
Location: Maryland
Reputation: 1

Unread postAuthor: al-xg » Fri Jul 13, 2007 8:35 am

yes of course but there's more chance that GGDT is right though, so its just as supersonic (in theory) as Mitchza89s.
Id like to try in though a chronograph one day.
  • 0

User avatar
al-xg
Colonel
Colonel
 
Posts: 643
Joined: Fri Jan 19, 2007 12:29 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Fri Jul 13, 2007 8:53 am

potatoflinger wrote:A lot of high-end bb guns can go supersonic, one from Cabelas can go up to 1,600 fps, so it is possible that you could go supersonic.


if you're referring to the Gamo, that doesn't count as an example because it's a spring piston rifle, since the air is compressed suddenly its temperature rises, also you have to consider the diesel effect of piston lubricant detonating in the chamber, which has been proved (by comparing airguns fired in a vacuum to those fired in a normal atmosphere) to be a significant contributor to spring airgun performance.

yay! im supersonic then !!!! wooohh


GGDT is a good performance guide but it cannot be depended on for accurate velocity data, you can only gauge this with a chronograph - they're not that expensive, you can get a cheap one off e-bay for very little, or even make your own using two photo-diodes and a PC microphone cable, there's a very good how-to on jimmy's site.
  • 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

Sponsored

Sponsor
 


Unread postAuthor: Mitchza89 » Sun Jul 22, 2007 5:02 am

Hey guys, this is a total noob question but I really don't have much of an idea... Where could I get a barrel thats good idea for bb's? I heard that some people use break line or fuel line or something and some others use copper. I live in Australia so where abouts and what would be the best stuff to use for as cheap as possible?
  • 0

User avatar
Mitchza89
Brigadier General
Brigadier General
 
Posts: 1056
Joined: Tue Jan 09, 2007 12:05 am
Reputation: 0

Unread postAuthor: wannabie » Sun Jul 22, 2007 5:13 am

well im my hybrid im going to be using a 1/4" x 6" brass all threaded nipple that fits 8mm bb's almost perfectly i get my bb's from a camping store and they sell them as sling shot rounds
  • 0

User avatar
wannabie
Captain
Captain
 
Posts: 304
Joined: Sun Apr 15, 2007 11:44 pm
Location: Australia
Reputation: 0

Unread postAuthor: Mitchza89 » Sun Jul 22, 2007 5:17 am

Ahh that could work pretty well. So you buy BB's from any camping shop? I didn't know that :S Is that in Australia though?
  • 0

User avatar
Mitchza89
Brigadier General
Brigadier General
 
Posts: 1056
Joined: Tue Jan 09, 2007 12:05 am
Reputation: 0

Unread postAuthor: wannabie » Sun Jul 22, 2007 5:22 am

yep im in Aus :P yeah most camping shops if they sell sling shots they will sell them there steel or chrome i think
  • 0

User avatar
wannabie
Captain
Captain
 
Posts: 304
Joined: Sun Apr 15, 2007 11:44 pm
Location: Australia
Reputation: 0

Unread postAuthor: Mitchza89 » Sun Jul 22, 2007 5:25 am

Thats awesome. With the length of the 1/4in brass, I wish that came in 1m lengths haha.
  • 0

User avatar
Mitchza89
Brigadier General
Brigadier General
 
Posts: 1056
Joined: Tue Jan 09, 2007 12:05 am
Reputation: 0

Unread postAuthor: wannabie » Sun Jul 22, 2007 5:53 am

yeah well you can only wish although i have seen on some american sites they have it upto 2 feet long !!! lucky americans ... good luck on your bb gun
  • 0

User avatar
wannabie
Captain
Captain
 
Posts: 304
Joined: Sun Apr 15, 2007 11:44 pm
Location: Australia
Reputation: 0

Unread postAuthor: CpTn_lAw » Sun Jul 22, 2007 6:45 am

I've looked at wht you plan on making, it sounds great! i had approx. the same thing. You won't get 2600 fps...i pumped mine at 300 psi, and "only" got 1300 fps.
I suggest you use 0.36 grams BB's, 8mm OD copper is perfect fit for airsoft BB's. 15mm galvanized steel is great for a chamber => holds a lot of pressure.
  • 0

"J'mets mes pieds où j'veux, et c'est souvent dans la gueule."
User avatar
CpTn_lAw
Brigadier General
Brigadier General
 
Posts: 987
Joined: Sun Sep 11, 2005 9:10 am
Location: France
Reputation: 0

Unread postAuthor: Mitchza89 » Sun Jul 22, 2007 7:13 am

Thanks alot. Yeah I thought 2600fps was waaaaaay too optomistic hahaha. 1300fps is def. nothing to sneeze at though. thats pretty damn quick.... What was the penetrating power on your bb gun you made? I'm thinking it was pretty decent with 1300fps behind the little bugger :D
  • 0

User avatar
Mitchza89
Brigadier General
Brigadier General
 
Posts: 1056
Joined: Tue Jan 09, 2007 12:05 am
Reputation: 0

PreviousNext

Return to BB/Airsoft/Pellet Gun Discussion

Who is online

Registered users: Bing [Bot], farcticox1, Gussmoore, MSNbot Media, Yahoo [Bot]

Reputation System ©'