Quote:
Originally Posted by ThunderCactus
Sorry if it seems like I'm explaining it too simply, I just want everyone reading this to understand!
|
Don't worry :P
I understood that already.
I actually explained this to somebody else 2 days ago almost word for word of what you just posted.
--
My understanding of the difference between HPA and Propane/C02 is that when the propane/C02 is compressed, it takes a liquid form. This is why you hold a propane bottle upside down when filling mags, so the liquid gets in. Then the mag acts as an expansion chamber, allowing some of the liquid to expand into gas that is ready to be released into the barrel.
When this gas releases into the barrel, it still has a lot of expanding to do. This need to expand combined with the force it is being pushed into the barrel at are what make heavier, slower, BBs pick up more energy than lighter ones that just fly out instantly.
HPA does not compress into a liquid, and we only use it as a pressure source to propel the BB, no expanding of the air, or at least not nearly as much expansion as propane/C02.
--
Now with that being said...
I just tuned the 509mm barrel for 1.3J on BBB 0.2g then put BBB 0.28 in and got an increase of 0.15J, up to 1.55J.
So apparently I was incorrect about HPA not expanding as much. It expands plenty :P
I am going to do some research and find out if there is math out there that I can comprehend that will tell me the volume of air leaving the FE @ X PSI w/Y nozzle diameter and Z Time period (DP)
Volume of a cylinder is the easy part lol.
Hopefully this will help find the perfect DP, and have the math to back it up.