DerpWithAGun wrote:Hmm this is a hard decision. If I create my own air tank, maybe a 2000 psi tank that is 20cm long and 2 cm in diameter what would be the best way to reach 2000 psi? A fridge compressor wont take me that high, a scuba tank is expensive + needs refills every so often. Would a schrader valve go up to 2000 psi without blowing? And if I was to make that stirrup pump would it take my small pressure tank to 2000 psi?
If you're not willing to go the SCUBA tank route, you need a stirrup pump. You can buy one that goes to 3600 relatively cheaply:
http://www.ebay.com/itm/Benjamin-Hand-P ... 3f08a2de90
Barring some replacement seals, air will be free, and it will keep you fit
Lastly, how many shots do you think my chamber will be able to make before refilling?
That depends entirely on your valve.
BTW I have a small portable air compressor (one you take into your car that plugs into your car and used for pumping up tires) that can go up to 250 psi.
It's rubbish, leave it in the car where it belongs and use it to pump tyres
It wont be much of help to me but if I was to pump up my chamber with it to 250 psi how many shots do you think it'll make? Remember I want to shoot 5mm or 6mm steel BB at 800 fps. What do you think would happen? Success or no success??
Just to give you an idea, with
this at 400 psi and using a burst disk valve (which is as efficient as it gets, and completely dumps the chamber) and a 37 inch barrel, I was "only" getting just over 700 fps with a 1 gram 5.5mm lead pellet.
To get such high velocity with a hammer valve, and get more than 2 or 3 shots, you're going to need very high pressure in your tank.
You might want to consider a slide valve/QEV arrangement, with a higher flow valve you don't need such high pressure.
There's no shame in having a bigger chamber and using that as a stock, some real world examples:
