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 54 users online :: 5 registered, 0 hidden and 49 guests


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

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

Anyone use a 2" valve before??

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: Atattack » Tue Sep 13, 2011 10:52 pm

I would model it but I don't know what the pressure on 2" gun will be that will be max that I can handle.
  • 0


Atattack
Staff Sergeant
Staff Sergeant
 
Posts: 123
Joined: Fri Aug 19, 2011 8:33 am
Reputation: 0

Unread postAuthor: Mr.Tallahassee » Tue Sep 13, 2011 11:37 pm

Technician1002 wrote:I wonder if the dealership heard it land on the roof. :roll:
I'm certain they're trying to figure out how in bloody hell a chicken lays an egg in flight. :lol:
  • 0

User avatar
Mr.Tallahassee
Major
Major
 
Posts: 364
Joined: Sun Jul 10, 2011 2:35 am
Reputation: 0

Unread postAuthor: Technician1002 » Tue Sep 13, 2011 11:46 pm

Atattack wrote:I would model it but I don't know what the pressure on 2" gun will be that will be max that I can handle.


Anything under 500 Ft/Lbs should be no problem. Anything over 1,000 Ft/Lbs could be problems depending on if you are a lightweight.
  • 0

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

Unread postAuthor: Zeus » Tue Sep 13, 2011 11:48 pm

Mr.Tallahassee wrote:
Technician1002 wrote:I wonder if the dealership heard it land on the roof. :roll:
I'm certain they're trying to figure out how in bloody hell a chicken lays an egg in flight. :lol:


In a less than 13 second flight at that. My chickens draw out the process.

Speed laying anyone?
  • 0

/sarcasm, /hyperbole
User avatar
Zeus
Major General
Major General
 
Posts: 1422
Joined: Tue Oct 27, 2009 7:34 pm
Location: 'Straya, C*nt
Reputation: 2

Unread postAuthor: Labtecpower » Wed Sep 14, 2011 12:59 am

I've shot my QDV from the hip with a 475 gram projectile. I think the whole thing weighs about 4kg.
I calculated the energy, and it's about 2150 joules or 1585 foot-pounds.
  • 0

"ñøw mÿ šįg šüçkś!"
User avatar
Labtecpower
Major General
Major General
 
Posts: 1267
Joined: Sat Feb 20, 2010 6:38 am
Location: Herb Island
Reputation: 7

Unread postAuthor: jackssmirkingrevenge » Wed Sep 14, 2011 1:16 am

It's not about muzzle energy but momentum.

From another thread:

A 50 cal rifle firing a 50 gram projectile at 800 m/s would generate 40.0Ns of recoil.

A hybrid firing a 100 gram projectile at 565 m/s would have same muzzle energy as the above, but generate 56.5Ns of recoil.

After reading muzzle brake thread I think I am leaning towards a suppressor because will have numerous people around when using this and am a little concerned about people saying muzzle brakes can be very loud. Anyone know how suppressor compare to muzzle brakes as far as recoil efficiency?


The noise issue will affect people around you more than the shooter, unless your brake directly pushes the air backwards.

Remember, air coming out of holes in the barrel does so at 90º to the projectile travel, so it does reduce recoil, but doesn't fight it.

Directing that air back will actively try and push the barrel forwards, against the recoil.

Have a look atthis project to get an idea of the forces involved.

As to a recoil system, what you want is the barrel and chamber mounted on some sort of cradle where they are free to recoil, and then you will have to incorporate some sort of buffer system to hold that recoil - bungee chord, large spring, gas strut, lots of options available.

The Barrett M82A2 is a good illustration of a shoulder fired big bore rifle:

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: Atattack » Wed Sep 14, 2011 8:00 am

I was doing some research last night on how to do the recoil absorpotion system. I some some linear rail systems that were over $150. I'm sure there is a more economical way to do this. I am trying to make this gun look as nice as possible so any ideas would be appreciated.

I think I am going to focus of recoil absorpotion system first and then look into suppressor. The fact of muzzle brake increasing noise makes me want to fire gun first, figured this would be an easy addition
  • 0


Atattack
Staff Sergeant
Staff Sergeant
 
Posts: 123
Joined: Fri Aug 19, 2011 8:33 am
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: Crna Legija » Wed Sep 14, 2011 8:27 am

you could use a shock absorber from a small mountain bike might need to put a lighter spring on it
  • 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

Unread postAuthor: Atattack » Wed Sep 14, 2011 8:36 am

I am trying to figure out how to mount it to my chamber. I am going to have a bar come straight down from chamber to act as the stock.
  • 0


Atattack
Staff Sergeant
Staff Sergeant
 
Posts: 123
Joined: Fri Aug 19, 2011 8:33 am
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Wed Sep 14, 2011 8:49 am

Here's a basic idea of what you should be aiming for, green is the barrel-valve-trigger-chamber, purple is the part that rests on your shoulder and grey is a spring.

It's unlikely you'll find a coil spring that big that won't be too stiff, but as I said, the spring can be replaced with a gas strut that can be found reasonably cheaply on eBay or from your local automotive outlet, bungee chords or slingshot elastic are also a viable solution.
  • 0

Attachments
recoilsystem.png
recoilsystem.png (1.5 KiB) Viewed 260 times
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: POLAND_SPUD » Wed Sep 14, 2011 9:10 am

I'm sure there is a more economical way to do this
there is :D
make the gun as heavy as possible - that will reduce the recoil
  • 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: Atattack » Wed Sep 14, 2011 9:12 am

I see, I am gonna wait and see how bad the recoil is then decide on what to do. I was originally trying to weld a track system to the bottom of the chamber and have a single gas strut.

Not sure if that would work since it would not distibute force evenly.
  • 0


Atattack
Staff Sergeant
Staff Sergeant
 
Posts: 123
Joined: Fri Aug 19, 2011 8:33 am
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 ©'