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Qev + slide valve.

This area is for the discussion of BB or airsoft sub machine guns, and or other small arms such as pellets.
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Qev + slide valve.

Unread postAuthor: warhead052 » Sun Aug 14, 2011 11:25 am

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.
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Unread postAuthor: Lockednloaded » Sun Aug 14, 2011 12:37 pm

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
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Unread postAuthor: warhead052 » Sun Aug 14, 2011 12:40 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.
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Unread postAuthor: Goats spudz » Sun Aug 14, 2011 12:45 pm

you can use something like this http://www.ebay.co.uk/itm/homebrew-pressure-barrel-CO2-C02-cartridge-full-/290597406657?pt=Home_Brew&hash=item43a8f487c1#ht_1760wt_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 :D
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Unread postAuthor: Gun Freak » Sun Aug 14, 2011 12:48 pm

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.
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Unread postAuthor: warhead052 » Sun Aug 14, 2011 1:06 pm

What pressure was that at gun freak?
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Unread postAuthor: Gun Freak » Sun Aug 14, 2011 1:07 pm

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.
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Unread postAuthor: warhead052 » Sun Aug 14, 2011 3:55 pm

Is your detent sniper on spudfiles? And can you give me some more of the specs on it?
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Unread postAuthor: Gun Freak » Sun Aug 14, 2011 6:12 pm

PM me about it :wink:
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Unread postAuthor: warhead052 » Sun Aug 14, 2011 6:40 pm

Alright, I will.
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