How many fill you think?

[Dr. Kralenstein]

I have a rifle with a 180cc tube filled to 230 bar. I'm wanting to use a 500cc 4500 psi bottle as a backup fill station for hiking/hunting vs lugging the 3L with me.

So roughly how many fills could I get out of that 500cc bottle when filled to 4500 psi?

I'm not the best at volumetric equations lol, thanks!

 

[GA_LeadHead]

Realizing I'm comparing grapefruits to oranges, I have a 700cc bottle that I use the edgun "Peazy" on to fill/top off a 580cc bottle. It never FILLS the 580cc but I get a couple of decent partial fills and maybe a couple more small partial fills. Enough to keep you going but don't expect it to fill it up.

I expect you will get something similar, maybe one good top off to full and then maybe a partial fill or two. Plenty for hunting, unless you are working flocks of pigeons/sparrows or something. Hopefully someone that knows the math can chime in and give you a better estimate.

I like the ease of packing a bottle, but I'm seriously considering one of Joe's guppy tanks for running and gunning.

 

[Dr. Kralenstein]

Yeah, the gun in question gets 20 shots in its curve so I'd like to be able to get that up to 50, which is my magazine limit anyhow. If I need more gun I have bigger, just want to walk and stalk vs sit and spray!

 

[theLBC]

Airgun Tank Fill Calculator

 

[dizzums]

would it get 50 with a 680cc bottle on the gun itself? im sure, just be careful about waste on connection and bleeds ... as a test you could fill the bottle to '230', tether the bottle to the gun and open the valve, then shoot it down ..

 

[Dr. Kralenstein]

would it get 50 with a 680cc bottle on the gun itself? im sure, just be careful about waste on connection and bleeds ... as a test you could fill the bottle to '230', tether the bottle to the gun and open the valve, then shoot it down ..

It's a carbine I'm finishing up with a tube no bottle. I'm just thinking an extra bottle with a foster right off the fill valve so no whip to worry about. Keep it in my pack. Not like I'd be needing 50 shots on a hunting trip, but I get bored sometimes and will shoot random crap whilst waiting on Mr squirrel to show up.

 

[Dr. Kralenstein]

Airgun Tank Fill Calculator

Either I'm doing that wrong or it says fill only 0.2 times from a 2200 psi refill to 3400 psi. That doesn't seem right.

Even saying my 3L 300 bar bottle will only fill 2 times and I know it'll do plenty more than that.

 

[Dr. Kralenstein]

Ok, maybe I didn't carry a 1 or a 3... or divide something, but I think I got it. 1.2x fills if .5L is 30.51 CI, turns to roughly 2.5 CF. So that pretty much what I'd need. It would give me an extra full fill and most of another fill in my power curve.

 

[theLBC]

Either I'm doing that wrong or it says fill only 0.2 times from a 2200 psi refill to 3400 psi. That doesn't seem right.

Even saying my 3L 300 bar bottle will only fill 2 times and I know it'll do plenty more than that.

i can't vouch for their calculator. here is another one.

Tank Calculator | Pyramyd Air

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as soon as you start filling, your source pressure drops quickly from a small bottle ime. i have a guppy.
if i fill at 2500 psi, i get 20ish fills
if i fill at 2000 psi, i get ~10.
some shooters that have high fill pressures will cascade bottles, so they use one bottle up to moderate pressure, and a 2nd bottle to top off the gun.

 

[JimD]

Looks like both calculators give essentially the same answer. The Pyramid one just rounds to the nearest number of fills, however, instead of giving a fractional answer (one of my checks gave 8.6 on the first one and 9 on the Pyramyd).