Author Topic: WAR Cobra with 500 cc tank  (Read 622 times)

Alan

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WAR Cobra with 500 cc tank
« on: May 16, 2019, 02:15:45 PM »
I ordered a 500 cc tank for my Cobra (and Jim Gaska delivered!), to replace the 350 cc it came with. Although 33% larger in volume than the original, it weighs about 140% more in weight (1.08 vs. 1.43 pounds). That's an extra 4 ounces hanging on the end of the airgun! Aside from the extra weight (the gun already weights too much!), balance is an important attribute, even though I shoot over bags most of the time. Well folks, I was pleasantly surprised! That little bit of extra weight hanging out there towards the end, actually helped, rather than hindered, off-hand shooting. The pendulum effect I supposed? But there is another trade off.

After exhaustive tests (only two shot series actually), the gun falls off regulator at about 68 shots depending on the ambient temperature. So now, I should get about 90 shots before that threshold occurs. In my case, that means (on an average day), I won't need to refill until I get back to the home base. I like that idea!
« Last Edit: May 16, 2019, 05:32:27 PM by Alan »


  • Roswell, New Mexico
Alan

I have an Omega compressor. If you're a fellow Guild member, and you pass through Roswell, NM, I'll fill your portable tank as a courtesy.

steveoh

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Re: WAR Cobra with 500 cc tank
« Reply #1 on: May 16, 2019, 03:13:07 PM »
I ordered a 500 cc tank for my Cobra (and Job Gaska delivered!), to replace the 350 cc it came with. Although 33% larger in volume than the original, it weighs about 140% more in weight (1.08 vs. 1.43 pounds). That's an extra 4 ounces hanging on the end of the airgun! Aside from the extra weight (the gun already weights too much!), balance is an important attribute, even though I shoot over bags most of the time. Well folks, I was pleasantly surprised! That little bit of extra weight hanging out there towards the end, actually helped, rather than hindered, off-hand shooting. The pendulum effect I supposed? But there is another trade off.

After exhaustive tests (only two shot series actually), the gun falls off regulator at about 68 shots depending on the ambient temperature. So now, I should get about 90 shots before that threshold occurs. In my case, that means (on an average day), I won't need to refill until I get back to the home base. I like that idea!

Nice! I wouldn't know what to do with myself if I had an airgun capable of 90 shots. I'm so used to getting two or three or maybe 10 with any of the big bores. The Marauder will do three or four magazines, but 90? Wowza.
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Alan

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Re: WAR Cobra with 500 cc tank
« Reply #2 on: May 26, 2019, 02:17:16 PM »
Here is a followup.

One of the first things one notices, is the time it takes to refill the tank. When you're used to 8 minutes tops, and now it takes 12 or so, it seems terminal so to speak. But the real answer/question is, how many shots can you really take before it falls off the regulator?

So far, I have managed to shoot 94, then 96, and yesterday, 99 shots, before the regulated-side gauge indicated less then the set of 1,825 PSI. Part of this is a result of varying temperatures, both fill and refill.
  • Roswell, New Mexico
Alan

I have an Omega compressor. If you're a fellow Guild member, and you pass through Roswell, NM, I'll fill your portable tank as a courtesy.

Motorhead

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Re: WAR Cobra with 500 cc tank
« Reply #3 on: May 27, 2019, 08:01:23 AM »
If you make yourself an SSG devise your shot count will go even higher and the ES lower.
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Alan

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Re: WAR Cobra with 500 cc tank
« Reply #4 on: May 27, 2019, 02:19:49 PM »
That fact I wouldn't argue. I ask Jim Gaska about this, but his claim is, that the Cobra valve doesn't need one. And honestly, nearly 100 shoots between fills?
  • Roswell, New Mexico
Alan

I have an Omega compressor. If you're a fellow Guild member, and you pass through Roswell, NM, I'll fill your portable tank as a courtesy.

Motorhead

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Re: WAR Cobra with 500 cc tank
« Reply #5 on: May 27, 2019, 04:10:12 PM »
That fact I wouldn't argue. I ask Jim Gaska about this, but his claim is, that the Cobra valve doesn't need one. And honestly, nearly 100 shoots between fills?

Belief of pro or con from the guy that had no part in the R&D of SSG's and not sure about Cobra tech either ... well ok.
Coming from one who has extensive R&D into BOTH Cobra & SSG .... if it works for you and unwilling to see/try for yourself, got nothing more to say on subject.

Regards,
Scott
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Alan

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Re: WAR Cobra with 500 cc tank
« Reply #6 on: May 27, 2019, 04:19:05 PM »
It is not that Scott. I have three airguns with SSGs installed. Yes, they did help the shot count, and the efficiency did get better. But all of them had a stock valve (Benjamin).

The one thing I want to do with the WAR, is replace the metal work with a wood stock. This fact will make adjusting can SSG much easier. Once I get that done, I might put together an SSG just to see what happens. As it sits now, what would I gain? Another 20 shots? I certainly don't know, that's for sure.
  • Roswell, New Mexico
Alan

I have an Omega compressor. If you're a fellow Guild member, and you pass through Roswell, NM, I'll fill your portable tank as a courtesy.

Motorhead

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Re: WAR Cobra with 500 cc tank
« Reply #7 on: May 27, 2019, 08:06:42 PM »
Easy peezy  8)
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oldpro

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Re: WAR Cobra with 500 cc tank
« Reply #8 on: September 02, 2019, 12:14:00 PM »
Easy peezy  8)
Yes it will really drive up the shot count, and lower the report as well.
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Alan

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Re: WAR Cobra with 500 cc tank
« Reply #9 on: September 02, 2019, 01:56:46 PM »
Yes it is. But....

I'm getting about 90 shots (temperature related), using a 500CC tank filled to 4,400 PSI, down to 1,825 regulated pressure, and achieving ≈885 FPS, which is a tad over 44 FPE (.250 Caliber, 25.39 grain Exacts). And NO SSG; just a Cobra valve. Report? Somewhat less than my .25 Marauder.
  • Roswell, New Mexico
Alan

I have an Omega compressor. If you're a fellow Guild member, and you pass through Roswell, NM, I'll fill your portable tank as a courtesy.

int3man

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Re: WAR Cobra with 500 cc tank
« Reply #10 on: September 29, 2019, 09:48:10 AM »
Easy peezy  8)
O.K.  Scott I'll bite, most of the SSG deigns that I see there is a way to hold the threads and adjust the spring tension from the back end.  Based upon your pictures you must remove the assembly and them hold the striker end to adjust the spring tension?  Edit.  O.K.  I get it the Spring and SSG are fixed and you increase by screwing in the allen Plug.  Got it.

Also would you use a SSG in conjunction with a regulated, balanced valve and MDS hammer?  Or is the SSG redundant at that point?

Thanks!
Michael
« Last Edit: September 29, 2019, 01:52:56 PM by int3man »
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