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  #1  
Old 11-23-2006, 04:49 PM
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DRAGON DRAGON is offline
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Cool 1385+ shots = 68/4500

I played paintball last weekend and had my tank filled to 4500psi at a local shop prior. I ended up only using my LP Imagine for the games I played, which were few. This is a renegade field and my buds that are normally there with hpa in a scuba tank weren't so for once I didn't add any pressure to the tank at all. I didn't really check the tank pressure when I got to the field. As some of us know, when you get a tank filled, the end result of pressure is usually a bit lower after the tank cools down. I have had the tank end up just above 4000psi after getting it filled to 4500psi before after cooling down. I did check the pressure before I left the pro shop and it was 4500psi dead nuts -

In the few games I did play in I just so happened to shoot 1000 balls exactly. I just checked my Crossy and it still has 1250psi left in it. So the way I figure it, I'm getting at least 1385+ shots from this 68/4500psi tank.

4500
1250
-----
3250psi(or less) used for 1000 balls

3250psi divided by 1000 balls = 3.25psi per ball

1250psi divided by 3.25psi pr/bl = 385 balls(rounded)

1000 balls + 385 balls = 1385 balls per 4500psi(technically)

**did I figure that right mathematical geniuses?**

All this did not include dry fires and what-nots in between and possible less starting pressure but should be fairly accurate though prolly a little more. Not bad I suppose for a regular LP'd Spyder. I've heard some ridiculous numbers like 2100 shots from a 68/4500 on the net before. I think people that post things as such are pathetic for attention, have some erroneous math skills or both -

I'm a bit curious about the shot count on the new VS's since they have the lighter striker and from what I have gotten, in reality run relatively 250psi. My Imagine runs at 300psi @ 280fps. Anybody actually have any valid numbers on the VS's perhaps? Anybody have any valid numbers for their LP Spyder's in general? -

'05 Imagine
Palmer's Stabilizer
Rocket valve(completely opened)
Blocked striker exhaust port
Modified stock VA
Modified stock bolt
Modified striker
Modified stock BL ASA
Light 32* main spring
14" J&J ceramic barrel
Ultra Evil paint
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  #2  
Old 11-27-2006, 07:16 AM
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Default Re: 1385+ shots = 68/4500

Not bad, I used to get 1200 out of my 68/3k on my E-99. I almost miss that gun.
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  #3  
Old 11-27-2006, 09:05 AM
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Default Re: 1385+ shots = 68/4500

sexy
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  #4  
Old 11-27-2006, 05:54 PM
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Default Re: 1385+ shots = 68/4500

any pics of this blocked striker exhaust port?
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  #5  
Old 11-27-2006, 06:36 PM
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Default Re: 1385+ shots = 68/4500

no you didnt do the math right, but i dont think there would be a very large diff. the more paintballs you shoot, the more pressure per ball you use, to keep the operating pressure in the marker the same. theres also the point at which the pressure in the tank reaches the operating pressure and the marker can't shoot anymore at a decent fps.

its still pretty good efficiency for a spyder, however you slice it
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Old 11-27-2006, 07:11 PM
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DRAGON DRAGON is offline
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Default Re: 1385+ shots = 68/4500

Quote:
Originally Posted by calebh
no you didnt do the math right, but i dont think there would be a very large diff. the more paintballs you shoot, the more pressure per ball you use, to keep the operating pressure in the marker the same. theres also the point at which the pressure in the tank reaches the operating pressure and the marker can't shoot anymore at a decent fps.

its still pretty good efficiency for a spyder, however you slice it
Quote:
Originally Posted by DRAGON
.........1000 balls + 385 balls = 1385 balls per 4500psi(technically)........
That's why I put the 'technically' disclaimer in there. If I had a tank full of pressure and 3/4 of a case of paint to waste, I could do it to the exact number. I'm not willing to throw that much paint down the toilet. I did not count dry fires and other side technicalities in the numbers including the loss of pressure after the tank cooled off after the fill. That alone could add 100's of psi -

Technically I could prolly get better as well. I normally top the tank off between games. The math as far as the mathematical formula is correct and that's what I was posting about. Not what could be upheald in a court of law lol -
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  #7  
Old 11-28-2006, 03:26 AM
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Default Re: 1385+ shots = 68/4500

Once I get a new tank reg for the GoodYear, I'll be making a shots/tank post...that ought to be interesting to say the least...lmfao
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  #8  
Old 11-28-2006, 07:30 AM
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Default Re: 1385+ shots = 68/4500

I had a similar expierence. I shot one pod (140) shots.. and about 60 dryfires, maybe more.. And I used 500 psi off of my PMI 68/45 (when i started it was at 4000 and was at 3500 when i was finished)

Correct me if i'm wrong, but that is 200 shots on 500 psi, which equals about 1400-1600 shots on a 4000 psi filled 68/45..

Keep in mind this was a STOCK spyder xtra.. I was using PMI premium and it had a pretty good fit to the barrel...

I think i may have done a math error somewhere, but IDK... Weird..
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  #9  
Old 11-28-2006, 02:51 PM
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Default Re: 1385+ shots = 68/4500

ya, again, it takes more more psi to shoot a ball the less pressure you have in your tank. its not taking more air, the operating pressure in the marker is the same, but the psi in the tank will drop faster as there is less pressure available to replace the pressure in the marker. also, on a stock spyder, you probly wont get any decent shots below 750 psi or so.

its the same math as is used to calculate how many fills you'll get out of a scuba tank, just on a much smaller scale. if anyone is willing and able to pull it off, go ahead. its a nice mix of chemistry and calculus. i havent taken calculus, and if i can avoid it, never will.
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  #10  
Old 11-28-2006, 02:57 PM
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Default Re: 1385+ shots = 68/4500

You gotta remember, at a certain point it will stop shooting. You can't go all the way down to 0psi. Somewhere around 500psi it'll stop recocking, maybe a little lower. That should still get 1300 shots though.
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