Jump to content


Christopher

Member Since 28 Sep 2008
Offline Last Active Apr 24 2011 09:11 PM
****-

Posts I've Made

In Topic: CO2 Users Club

21 December 2010 - 12:03 PM

you can use a macro line with co2 right? I want to put macro line on my phantom, but just making sure


Can you? Yes. Should you? IMO, not unless it's high pressure tubing with proper fittings. You'll probably get away with the regular stuff, but it's possible to go well over the operating pressure of the tubing or fittings on a hot day, especially with a pump. I have some compression fittings/better than average tubing that I don't need if you want them.

In Topic: It's not a f*cking addiction!

17 December 2010 - 07:24 PM

There's a difference between being physically addicted to something and being mentally addicted. If it's physical, you have actual physical withdrawal symptoms. If it's mental, your mind just craves whatever you're "addicted" to for whatever reason (pleasure, habit, etc.) Technically, you can be mentally addicted to anything. That being said, I agree partially with you in that people will use "addiction" as an excuse.


This is a really bad way to characterize addiction. Addiction involves negative reinforcement and is a specific pattern of behavior. Just saying that you're "mentally addicted to something" is no different from saying that you prefer something more than you prefer other things. It's a dumb and misleading term. If something causes only mild withdrawal symptoms that don't prevent one from quiting use, then there is no addiction, only "dependence". This is why most people can use drugs like caffeine and marijuana and never get anything more than mild withdrawal symptoms and cravings that go away after a few days, if not sooner. Opiate/Cocaine post accute withdrawal symptoms and cravings can literally last years.

In Topic: Liquid Nitrogen for HPA

17 December 2010 - 07:16 PM


Yes, that's what I'm saying. In fact, Smart Parts made a video that exploits this concept that happens when you use CO2 on a low pressure marker to show how much more "efficient" it was than a standard Tippmann. The Tippmann (setup to fire as quickly as possible) dropped the tank pressure too low to keep cycling so it had to stop before the tank was empty. The SP1 on the other hand can shoot the tank dry. It looked very impressive to the untrained eye and it was very misleading.


It doesn't happen with HPA because there is no phase change. When liquid CO2 becomes a gas, it evaporates. That phase change process is endothermic and sucks heat from thesystem. That doesn't exist with HPA. Again, the entire reason behind HPA is to completely eliminate this phase change, which is why liquid nitrogen isn't such a good idea.


Are you saying that the SP video misleads people into thinking SP-1s can shoot a CO2 tank dry or, just how bad Tippmanns are?

I knew that about HPA, and I was using it to illustrate the disadvantage of CO2 (the phase change/temp problem).


They show how quickly a Tippmann goes from full power to unshoot able on a CO2 tank rapid fire. The problem is that the tank was not empty when the gun stopped, just cold. They put the same cold tank on an SP-1, and showed how you could basically empty the tank without significant fluctuations in velocity. They called it an "efficiency" demonstration, despite the fact that it was clear that the Tippmann had not actually used up that much gas.



In Topic: 8 gram nitrogen

16 December 2010 - 09:36 PM



That liquid nitrogen, even colder than co2 I think.

Yes liquid nitrogen sits at approximately -196C (yes Canadians are awesome) and liquid CO2 sits approximately at -40C (just guessing the temp. But i do know that that solid CO2 is around -78


Lets see room temp is about 27 C. So...

~ -348 F for liquid N2 and ~ 104 F for CO2

Thought I'd throw that in


Just to clarify, neither gasses are actually stored at those temperatures, those are the temperatures at which the gasses boil, which doesn't really mean much in this context. They generally stay at around room temperature unless you are shooting.

In Topic: N2 vs. HPA

16 December 2010 - 10:06 AM

Nitrogen will usually have less moisture in it than HPA, resulting in less pressure fluctuation from temperature changes. IMO it's not really worth the trouble, but there is a difference.