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 70 users online :: 5 registered, 0 hidden and 65 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

Something intresting.

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

Something intresting.

Unread postAuthor: warhead052 » Tue Jun 21, 2011 10:58 am

I found out today, that a 1/8" brass nipple, is the perfect fit for an airsoft bb. I am using .12g seamless bbs and they fly excellently. I guess I need to get some longer sections of 1/8" pipe for my next project.
  • 0


warhead052
Major General
Major General
 
Posts: 1769
Joined: Mon Mar 21, 2011 5:41 pm
Reputation: 0

Unread postAuthor: POLAND_SPUD » Tue Jun 21, 2011 11:01 am

was it a pipe nipple?
  • 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: warhead052 » Tue Jun 21, 2011 11:11 am

It was, I stated that. I was amazed that it worked though. It worked pretty well even though it was 2 inchs long.
  • 0


warhead052
Major General
Major General
 
Posts: 1769
Joined: Mon Mar 21, 2011 5:41 pm
Reputation: 0

Unread postAuthor: cammyd32 » Tue Jun 21, 2011 11:19 am

I just buy cheopo 6mm aluminium tubing for that job. :D it works brilliantly.
  • 0

User avatar
cammyd32
Captain
Captain
 
Posts: 326
Joined: Fri Apr 29, 2011 7:00 am
Country: United Kingdom (uk)
Reputation: 8

Unread postAuthor: warhead052 » Tue Jun 21, 2011 11:20 am

Yeah I dont think my local lowes or home depot has it. If they do then I obviously missed something.
  • 0


warhead052
Major General
Major General
 
Posts: 1769
Joined: Mon Mar 21, 2011 5:41 pm
Reputation: 0

Unread postAuthor: farmerboy32 » Tue Jun 21, 2011 1:33 pm

check out some online suppliers. I ordered a steel 6.04mm pipe before frome speedymetals i believe
  • 0


farmerboy32
Private First Class
Private First Class
 
Posts: 28
Joined: Thu Jan 01, 2009 2:43 pm
Reputation: 0

Re: Something intresting.

Unread postAuthor: dewey-1 » Wed Jun 22, 2011 11:05 am

warhead052 wrote:I found out today, that a 1/8" brass nipple, is the perfect fit for an airsoft bb. I am using .12g seamless bbs and they fly excellently. I guess I need to get some longer sections of 1/8" pipe for my next project.


To comprehend how much "slop" or blowby there is, look at this drawing comparing amount of clearance or blow by.

1/8 Brass Nipple/Pipe vs Airsoft 6,03mm Tight Bore vs Carbon Arrow.
  • 0

Attachments
6mm-Airsoft-BB.jpg
User avatar
dewey-1
Major General
Major General
 
Posts: 1298
Joined: Wed Mar 28, 2007 10:24 am
Location: NE Wisconsin USA
Reputation: 0

Re: Something intresting.

Sponsored

Sponsor
 


Unread postAuthor: warhead052 » Wed Jun 22, 2011 11:10 am

Well dewey, since there has to be room for the bb to get sucked into the barrel, its not that bad. Its better than the 3/8" barrel I have now.
  • 0


warhead052
Major General
Major General
 
Posts: 1769
Joined: Mon Mar 21, 2011 5:41 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Wed Jun 22, 2011 11:16 am

Something interesting from the BBMG wiki ;)

even if I say so myself, I wrote:Barrel tightness

The BBs should fit the barrel well enough to minimize leakage of air around the projectile (blowby) but not so tightly that friction is excessive. Even small differences in diameter can have significant effects on performance. An attempt to quantify this power loss was made in this experiment

Two 15 inch lengths of barrel tubing were used, one was aluminium with an I/D of 5mm, while the other was a straighted piece of coiled copper tubing with an I/D of 4.5mm. The barrels were hooked up to a blowgun attached to a compressor and used to fire lead BBs - with a nominal diameter of 4.5mm - at 100 psi through a chronograph. Over a 5 shot string, the 5mm I/D barrel averaged 242 feet per second, whilst the 4.5mm I/D barrel averaged 279 feet per second. With an average projectile weight of 8 grains, this gives a muzzle energy of 1.04 and 1.38 ft/lbs respectively - a significant power increase of 33% over the wider barrel.
  • 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: warhead052 » Wed Jun 22, 2011 11:29 am

Is it pretty much saying that the tighter the barrel, the better? Because I know that much, its just I only have 3/8" at the moment, and nothing smaller except for the 2inch long nipple.
  • 0


warhead052
Major General
Major General
 
Posts: 1769
Joined: Mon Mar 21, 2011 5:41 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Wed Jun 22, 2011 11:35 am

warhead052 wrote:Is it pretty much saying that the tighter the barrel, the better?


Yes, but a bit more than that - in that a tiny difference in barrel diameter (just 0.5mm or 0.01968 inches in the example above) can make a disproportionate and extremely signifcant difference in performance, so it's worth the effort to find the closest possible fit between projectile and barrel.
  • 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: warhead052 » Wed Jun 22, 2011 11:46 am

Well, for the pressure I would like to run this at, my friends will probably kill me. I tested it on my brother yesterday at 125 psi, and while the bb's spread like a shotgun, he still got hit about 50 times, and it left about 30 bruises on his legs. It was pretty funny because his face contorted in rage and he started chasing me around the house. And I also learned that I can get an air compressor from harbor freight for only $10, even though its car battery powered. I am aiming for a 1/4" or 1/8" barrel, and I am going to see about getting the body of either a SCAR or a mini uzi from a friend for it. Its going to look extremely nice, and I will hopefully find a way to put a magazine on it and what not.
  • 0


warhead052
Major General
Major General
 
Posts: 1769
Joined: Mon Mar 21, 2011 5:41 pm
Reputation: 0

Unread postAuthor: irisher » Wed Jun 22, 2011 11:53 am

I would advise against buying one of those $10 12 volt compressors. They wont have the flow you need and will die after only a few uses.
  • 0

User avatar
irisher
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 420
Joined: Mon Dec 29, 2008 2:53 am
Reputation: 0

Unread postAuthor: warhead052 » Wed Jun 22, 2011 12:02 pm

Yeah I know that much irisher, but I don't need high flow, and for what I would be filling it would not take very long.
  • 0


warhead052
Major General
Major General
 
Posts: 1769
Joined: Mon Mar 21, 2011 5:41 pm
Reputation: 0

Unread postAuthor: Crna Legija » Wed Jun 22, 2011 9:21 pm

warhead052 wrote:Yeah I know that much irisher, but I don't need high flow, and for what I would be filling it would not take very long.


it will brake in the first week for sure.
  • 0

'' To alcohol... The cause of, and solution to, all of life's problems.”
--Homer Simpson

Add me on ps3: wannafuk, 8/11/11 cant wait
User avatar
Crna Legija
Major General
Major General
 
Posts: 2333
Joined: Sun Jul 20, 2008 5:14 am
Location: australia
Reputation: 0

Next

Return to BB/Airsoft/Pellet Gun Discussion

Who is online

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

Reputation System ©'