Heres my plan, I am going to buy a 1/8" qev and a 1/8" slide valve from mcmaster. I need some help with the planning of the rifle though. I would like to get an airsoft bb to fly at least 100 feet, with a minimum of 200fps. I need some help calculating the size chamber I need, the pressure, and the length of the barrel. I would use ggdt, but it won't run on my computer, and I am done messing with it. Any help would be appreciated.
My plans for what I want it to eventually look like, either a barret m82 or a Cheytec Intervention. Air tank storage would probably be built into the gun, but if it is required to be external thats fine. I would like it to last at least 4 accurate shots, but more shots just a little less accurate is ok. A co2 fire extinguisher is my plan for an air tank, so I can charge it to 200 psi and not feel like its going to blow up on me.
Thanks for your help.
Qev + slide valve.
-
warhead052
- Staff Sergeant 3
- Posts: 1769
- Joined: Mon Mar 21, 2011 5:41 pm
-
Lockednloaded
- Staff Sergeant
- Posts: 1566
- Joined: Thu Sep 03, 2009 9:38 pm
- Location: Texas, USA
- Been thanked: 7 times
Well you'll need to include some details like barrel ID, and the volume of your FE tank, but just from some assumptions, you could easily achieve <200fps with a small chamber and low pressure. It doesn't take much to get those BBs going
I love lamp
-
warhead052
- Staff Sergeant 3
- Posts: 1769
- Joined: Mon Mar 21, 2011 5:41 pm
Barrel id would be as close to 6mm as I could get at lowes or home depot. So I am guessing around 6.4mm? And the FE tank volume would be, give or take, about 1 gallon empty.
-
Goats spudz
- Specialist 4
- Posts: 458
- Joined: Tue Aug 02, 2011 12:31 pm
- Contact:
you can use something like this http://www.ebay.co.uk/itm/homebrew-pres ... 760wt_1139 for a tank like what im using but you have to use a special adapter or drill out the poppet in the valve or remove the valve 
-
Gun Freak
- Lieutenant 5
- Posts: 4971
- Joined: Mon Jan 25, 2010 4:38 pm
- Location: Florida
- Been thanked: 8 times
Just hook a blowgun up to the barrel and use a tee mag, with decent pressure they will go fast. You could also use a detent to get higher fps. My detent airsoft sniper can get up to 750 fps and beyond with just a detent.
OG Anti-Hybrid
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna" ■ M16 BBMG ■ Pengun ■ Hammer Valve Airsoft Sniper ■ High Pressure .22 Coax
Holy Shat!
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna" ■ M16 BBMG ■ Pengun ■ Hammer Valve Airsoft Sniper ■ High Pressure .22 Coax
Holy Shat!
-
warhead052
- Staff Sergeant 3
- Posts: 1769
- Joined: Mon Mar 21, 2011 5:41 pm
-
Gun Freak
- Lieutenant 5
- Posts: 4971
- Joined: Mon Jan 25, 2010 4:38 pm
- Location: Florida
- Been thanked: 8 times
Only about 100, my gun is full metal and capable of whatever I can put in it, but I won't go any higher than about 120 in a match.
OG Anti-Hybrid
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna" ■ M16 BBMG ■ Pengun ■ Hammer Valve Airsoft Sniper ■ High Pressure .22 Coax
Holy Shat!
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna" ■ M16 BBMG ■ Pengun ■ Hammer Valve Airsoft Sniper ■ High Pressure .22 Coax
Holy Shat!
-
warhead052
- Staff Sergeant 3
- Posts: 1769
- Joined: Mon Mar 21, 2011 5:41 pm
Is your detent sniper on spudfiles? And can you give me some more of the specs on it?
-
Gun Freak
- Lieutenant 5
- Posts: 4971
- Joined: Mon Jan 25, 2010 4:38 pm
- Location: Florida
- Been thanked: 8 times
PM me about it 
OG Anti-Hybrid
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna" ■ M16 BBMG ■ Pengun ■ Hammer Valve Airsoft Sniper ■ High Pressure .22 Coax
Holy Shat!
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna" ■ M16 BBMG ■ Pengun ■ Hammer Valve Airsoft Sniper ■ High Pressure .22 Coax
Holy Shat!
-
warhead052
- Staff Sergeant 3
- Posts: 1769
- Joined: Mon Mar 21, 2011 5:41 pm