Could a PCP run from a continuous air stream?

[gy954]

Most PCPs use a few 100 psi per shot, yes? So suppose you had a compressor that produced, say, 900 psi. Could you feed that into the gun's tank and run the compressor continuously? Of course, you would have to shoot from a fixed location since you would be hooked up to the air source. So for bench shooting, would that approach work?

I am certain this question shows my complete lack of understanding of something. ;-)
/ Greg

[Norm_m]

You would need 2400 - 3000 PSI to get anything worth shooting from your MRod. Most of us are filling the MRod up to 2400 - 3000 PSI mostly depending if you are pumping by hand of have a tank and shooting it down to around 1800 - 2000 PSI and charging it back up. The 900 PSI would barely get the pellet out of the barrel!
Norm

[rkr]

You could check the vortex chamber and using an air compressor 

[rsterne]

You can get air pressure boosters that will work on shop air (~120 psi) and boost the pressure to ~3000.... but they are $2000+.... nearly as much as a SCUBA compressor (~$3000)....

A ShoeBox compressor hooked up to a SCUBA tank would work pretty well.... but it will only deliver about 150 psi per hour into an 80 CF tank.... If you were shooting enough to use more air than that it couldn't keep up.... If you used a regulator on the output of the SCUBA tank to keep the pressure right in the sweet spot for the PCP in question you would likely be able to shoot for a VERY long time.... but this setup wouldn't be cheap....

I haven't seen compressors that put out ~900 psi and don't know the cost.... If it wasn't prohibitive, and could keep up to your shooting your would get slightly better than CO2 performance from it (650-700 fps ?)....

Bob

[amb5500c]

I've never seen anyone shoot while tethered to a compressor, but being tethered to a tank is quite common.
Richard

[Addictedtoair]

I use a regulator on my CF 4500 psi tank and tether it to my FX Independence for bench rest shooting sessions. I am able to keep it at 150 bar pressure and it is the "sweet spot" for this weapon giving me the best performance with two different pellets.
 With the 15.9 JSB Match Diablo Exact Jumbo's I get an average velocity of 927 fps, an average extreme spread of 8 fps, an average standard deviation of 2 fps, generating an average 30 fpe.
With the 18.1 JSB Match Diablo Exact Jumbo Heavies I get an average velocity of 874 fps, an average extreme spread of 10 fps, an average standard deviation of 3 fps, generating an average 31 fpe.
 Bob is right,...it is a bit pricey but the results speak for themselves. I usually get thousands of shots this way between fills as well.

Brett

[aack73]

in the grand scheme of things, whats a $300/$400 regulator. compared  to pcp gun and scba tanks, etc. just saying.

[TimmyMac1]

in the grand scheme of things, whats a $300/$400 regulator. compared  to pcp gun and scba tanks, etc. just saying.

In a word "Pointless". You have to turn the tank on slowly, pay attention and turn it off. It is not rocket science. Regulators to make sure you don't overpressure your gun are simply unneccesary for the task at hand.

I've used them on permanently fixed test systems requiring consistency normal airguns don't really need. Most will run in a specific PSI range effectively and it isn't too tough to accomplish that with no internal or external regulator.

I'd get a good piece of used Leupold glass with the savings that will pay you back anytime you want to have your money back.

It takes a lot of trick port work and tuning to get a 900 psi system to work well as that is a very low peak pressure and tough to get the valve to be quick enuf as valve duration goes up as pressure drops.

[aack73]

in the grand scheme of things, whats a $300/$400 regulator. compared  to pcp gun and scba tanks, etc. just saying.

In a word "Pointless". You have to turn the tank on slowly, pay attention and turn it off. It is not rocket science. Regulators to make sure you don't overpressure your gun are simply unneccesary for the task at hand.

I've used them on permanently fixed test systems requiring consistency normal airguns don't really need. Most will run in a specific PSI range effectively and it isn't too tough to accomplish that with no internal or external regulator.

I'd get a good piece of used Leupold glass with the savings that will pay you back anytime you want to have your money back.

It takes a lot of trick port work and tuning to get a 900 psi system to work well as that is a very low peak pressure and tough to get the valve to be quick enuf as valve duration goes up as pressure drops.

So you recommend tethering an ag to a 4500 psi tank with out a regulator? Just turn it on slowly and then turn it off? 

[TimmyMac1]

Get a tank at the appropriate pressure and shoot.
If you need to be thethered to a 4500 then a reg is appropriate.
I never shot tethered in my life so I have zero experience.
What are you accomplishing? Can you duplicate the consistency in the field?
WE were never allowed to fill during a card or be tethered in Temecula so I guess where you can this discussion would have experienced input.