Help out a newbie, 90ci tank worth it?

[Diggdug]

So I have an FX Bobcat MK2 in .25 cal. 470cc tank.

Would a 90ci tank with 3600 psi fill my gun from 2000 to 3200 PSI? How many times? How bout if I fill the 90ci to 4500 PSI?

Thanks!

I am wondering if it is even worth buying a 90ci tank for my backpack?

[Wayne52]

90 ci is big for backpack but at 3600psi it might fill it 3 times, if you can get 4500psi it will fill it a bunch of times. I just topped off my Mrod and Prod both from an 88ci scba tank I had filled about a month ago, I've been shooting more than I normally do because it's the first Tank I've had and I've been going hog wild just wasting pellets over the Chrony tuning both of them for different short and longer strings, I was thinking maybe I'll get the tank filled this weekend again but it's still got about 3500psi in it yet. 

[CraigH]

There are some calculators available.   Here are two:

http://calc.sikes.us/2/

https://www.airhog.com/index.php?id_cms=8&controller=cms

I forget the relationship for the various tank volumes.

[Doug Wall]

The AOA fill calculator says 7.4 fills for a 3600psi tank fill, and 19.2 fills for a 4500psi tank fill. Actual fills would be a little less because of hose venting after fills.

[mobilemail]

The AOA fill calculator says 7.4 fills for a 3600psi tank fill, and 19.2 fills for a 4500psi tank fill. Actual fills would be a little less because of hose venting after fills.

And if you are filling it off a bigger carbon tank, you will never actually get it to 4500psi.  But if you're using it for a day of hunting, it will be a far sight easier to carry than a full size bottle!

[Diggdug]

90 ci is big for backpack but at 3600psi it might fill it 3 times, if you can get 4500psi it will fill it a bunch of times. I just topped off my Mrod and Prod both from an 88ci scba tank I had filled about a month ago, I've been shooting more than I normally do because it's the first Tank I've had and I've been going hog wild just wasting pellets over the Chrony tuning both of them for different short and longer strings, I was thinking maybe I'll get the tank filled this weekend again but it's still got about 3500psi in it yet. 

Its 90 cubic INCH.....easily fits in a small backpack...

[Diggdug]

The AOA fill calculator says 7.4 fills for a 3600psi tank fill, and 19.2 fills for a 4500psi tank fill. Actual fills would be a little less because of hose venting after fills.

And if you are filling it off a bigger carbon tank, you will never actually get it to 4500psi.  But if you're using it for a day of hunting, it will be a far sight easier to carry than a full size bottle!

WOW! OK thanks! I didn't think I would get that many fills from it! I guess it is worth buying one. Thanks!!!

[grimeszee]

Here is what Airhog has for the 90cu tank. 90 ci converts to 14.21 cf, I have a Airforce with the 390cc tank and I can get about 5 fills from 3000 to 2000 with my 90 ci tank.


Enter the variables and press Calculate.

NOTE: All variables must be entered in order for the calculator to work properly. Also, Tank Fill Pressure must be greater than Gun Fill Pressure.
 

Tank Size:
 14 ft³ 

Tank Fill (Gauge) Pressure:
 4500 psi 

Fill Gun to What Pressure?
  3200 psi 

Gun Cylinder Size:
 470 cc 

Refill Gun When it
Reaches What Pressure?
 2000 psi 

 Number of Refills: 3
   

[Wayne52]

It all depends on where you get it filled, where I go for a full 4.5K fill he said I'd have to leave the tank over night but the price is still the same.

[Wayne52]

Dang I was thinking 90 cuibic feet duh, my scba is an 88 cubic feet capacity or so they say. Sorry about that.  That's why I was thinking it would be too big for a back pack.

[39M]

Here's a link to Crosman's 90ci tank.
It's 15" long and 4" in diameter.

http://www.crosman.com/airguns/airgun-accessories/pcp-charging-system-15

If you scan down and click on DETAILS, it tells how many fills you get on all of their guns from a certain beginning pressure....AND, there's a CALCULATOR link to figure fills for other guns.

[Frank in Fairfield]

I have had Great White, Tiger Shark and Guppy tanks.
With my own source of air (Shoebox and our club has Bauer compressor) the Guppy (and/or the Benji which I have now) is fine.

[Sfttailrdr46]

So I have an FX Bobcat MK2 in .25 cal. 470cc tank.

Would a 90ci tank with 3600 psi fill my gun from 2000 to 3200 PSI? How many times? How bout if I fill the 90ci to 4500 PSI?

Thanks!

I am wondering if it is even worth buying a 90ci tank for my backpack?

I can fill my Rainstorm II about 10 to 12 times with my Guppy 18 cu ft tank from 4500 psi to ~2700 PSI