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 Posted: Wed May 05, 2010 3:37 am |
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| packrat |
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| Joined: 16 Nov 2009 |
| Posts: 882 |
| Location: Out in the woods...Ellabell, GA. |
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Hey there! glad to see you're still alive and kickin'...that link you posted is for paintball....read the features that are listed...it's output is 850 psi...is that all the pressure you want for an Mrod.?
You need CUBIC FEET..that paintball tank is 68 cubic INCHES.... I will point out once again..that you do NOT have to have a 15 year, $600.00 carbon fiber tank....you can buy a used tank in like new condition for half that amount, with a fresh hydro, with a macro-line 3 ft hose and gauge setup for MUCH less...If you're more concerned about cost per fill, and cost per year over each year used versus trade-in value, well, good luck.. I bought a 66CUBIC FOOT, 4500psi fiberglass tank, with a new hydro test that looks brand new!!! It came with the 3 ft.macro-line and liquid-filled pressure gauge..the tank has FIVE years service life left..I gave $350.00 for the entire setup, delivered to my door, (Georgia) from California.
You DO NOT have to have carbon fiber....fiberglass and aluminum tanks are evry bit as good...metal tanks weigh ~40 lbs. my fiberglass tank weighs 14.5 FULL, and CF is only 3-4 lbs less. Every bit as safe(firemen used them for YEARS before CF even existed!!) I doubt if I'm still airgunning 15 years from now, how about you? Though I may not have gotten the "cheapest per year of use" set-up...I DO HAVE the complete setup in my shop, and am using it...which is much better than wasting time worrying about a few dollars less for each year of use...here's a link to a great place for SCBA equipment.
http://www.hamcontact.com/airgun/HoseAssembly/ Joe is a heck of a nice guy, and easy to work with...I am VERY pleased with the set-up I bought from him, and highly recommend his product. |
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HEY !! This getting old thing is NOT for sissies... |
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| Posted: Wed May 05, 2010 9:07 am |
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| jgoodz420 |
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| Joined: 06 Oct 2009 |
| Posts: 74 |
| Location: Canada |
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| alphakilla wrote: |
| jgoodz420 wrote: |
If you fill the gun to 3000psi from a 3000psi scuba tank you will loose pressure from the scuba tank every time you fill from it, essentially only getting one 3000psi fill of your gun. Whereas if you you fill to 2200psi you would get 15 (I don't know the exact number, but more) fills at a constant pressure...........You will get more shots with a higher pressure fill in the gun, but it may not give the best average velocity string, most PCP's have a "sweet spot" below the max fill pressure where velocity is highest.......
You could also get a 68cu/ft carbon fiber tank that holds air at 4500psi, this is the optimal option. You would at least 30 fills on a Mrod filling it to 3000psi each time and stopping at 1700psi, filling it to 2200psi from the 4500psi tank would allow you 134 fills  that's assuming the Mrod air reservoir is 215cc, and stopping at 1700psi someone else may know if that is right or not...
But here is the calculator.......
http://www.airhog.com/tank.htm |
Been down for a while but, I'm back in the hunt for a maruader!!!  Is this the tank you're speaking of jgoodz? What type of adapter would I use with this type air tank??
http://www.zephyrsports.com/product/PB-ZPHR-684500/Zephyr-Paintball-684500-Carbon-Fiber-Paintball-Tank-5-Year-Hydro.html?meta=bizrate&metacpg=PB-ZPHR-684500&utm_source=BIZRATE&utm_medium=CPC&utm_content=&utm_campaign=PB-ZPHR-684500 |
Well yes and no........That is the type of tank; Carbon Fiber, but that is 68 cubic inches, you want cubic feet.....
You want one of these, but smaller 68cu/ft, well smaller will be cheaper anyway I guess that's up to you.....
http://www.pyramydair.com/s/a/Carbon_Fiber_Tank_4500_psi_88_cu_ft/350
Check out this fill calculator as well
http://www.airhog.com/tank.htm
With a 68cu/ft tank filled to 4450psi, filling a 210cc Mrod reservoir to 3000 psi and refilling at 1800psi you will get 36 fills
With that 80 cu/ft CF you would get 43 fills of the above mentioned pressures.......
Hope this helps, Cheers... |
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Air Arms EV2 Mk3
AF Condor .25/.22
Custom Crosman 1377
Crosman Quest 1000
Crosman Pumpmaster LE #1178 of 5000
Daisy Powerline 2003
Daisy Red Ryder 25th. Anni. LE #335 of 1500
Vostok Model 38 .177 |
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| Posted: Wed May 05, 2010 10:14 am |
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| rsterne |
| Moderator |
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| Joined: 15 Jan 2008 |
| Posts: 2998 |
| Location: Coalmont, BC |
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| Quote: |
| You need CUBIC FEET..that paintball tank is 68 cubic INCHES |
There seems to be a lot of confusion on tank capacities.... SCUBA and SCBA tanks are rated in cubic feet.... but that is the amount of air in the tank once expanded to 1 Bar (normal atmospheric pressure)....
Paintball tanks are rated in cubic inches.... but that is the actual internal volume of the tank.... To find out how much air it holds you need to multiply that by the pressure in Bar (which is psi divided by 14.5).... A 3000 psi tank is 207 Bar and a 4500 psi tank is 310 Bar.... Using the example of a 68 cubic inch tank at 4500 psi, you get:
68 cu.in. x 310 Bar / 1728 cu.in/cu.ft = 12.2 cu.ft. of air at 1 Bar....
HTHs....
Bob |
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Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal: Too many to count! |
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| Posted: Wed May 05, 2010 11:53 am |
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| Lipoly |
| Veteran Member |
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| Joined: 06 Dec 2009 |
| Posts: 241 |
| Location: St. Louis, MO, USA |
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Great info rsterne. It seems you get about 0.63 fills per cf of expanded air. So, that paintball tank will give about 12.2/.63 ~ 7.69 fills, which isn't terrible if you live (well work) very close to a dive shop that will fill up to 10k psi tanks.
Edit:
| Quote: |
| .it's output is 850 psi...is that all the pressure you want for an Mrod.? |
Just remembered this..paintball tank won't work. |
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Philip
RWS 350 .22 w/Leapers 4-16x50
Crossman 1377 |
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| Posted: Wed May 05, 2010 12:12 pm |
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| jgoodz420 |
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| Joined: 06 Oct 2009 |
| Posts: 74 |
| Location: Canada |
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| Lipoly wrote: |
live (well work) very close to a dive shop that will fill up to 10k psi tanks.
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10000psi tanks??? WOW that is insane......I need me one of those   |
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Air Arms EV2 Mk3
AF Condor .25/.22
Custom Crosman 1377
Crosman Quest 1000
Crosman Pumpmaster LE #1178 of 5000
Daisy Powerline 2003
Daisy Red Ryder 25th. Anni. LE #335 of 1500
Vostok Model 38 .177 |
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| Posted: Thu May 06, 2010 1:44 am |
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| alphakilla |
| Veteran Member |
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| Joined: 28 Nov 2008 |
| Posts: 121 |
| Location: Commonwealth of Virginia |
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| Thanks, PC. It's good to be alive and kickin' Can't wait to get my hands on an M-Rod. |
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Beeman 1073 Sportsman .177/.22 dual caliber |
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| Posted: Mon May 10, 2010 8:25 am |
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| alphakilla |
| Veteran Member |
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| Joined: 28 Nov 2008 |
| Posts: 121 |
| Location: Commonwealth of Virginia |
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Beeman 1073 Sportsman .177/.22 dual caliber |
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Don't know what to do. Can somebody redirect me? Could I use this tank if worse came to worse?: