Posted: Mon May 31, 2010 11:47 am
hit the wrong button, see below.
I disagree. I said "estimate of the optimal CB for efficiency". Note the italic and underline under "estimate". Should I have usedTechnician1002 wrote:This is a common error. Calculating the valve performance at higher pressure is far from trivial. As near SOS air speeds in the valve have an impact on the maximum flow through a valve, many builders find performance in the real world is much less than trivially calculated.jimmy101 wrote: For a pneumatic it is trivially easy to calculate.
This often results in barrels that reach peak velocity well before the projectile reaches the muzzle as peak flow through the valve is less than assumed.
On this page, some of the factors are mentioned.
http://www.crazybuilders.com/item.php?i ... ct_section
In his videos, he shows calculated performance is quite a bit higher than measured performance.
estimate?
Besides, we are talking about efficiency (note the bold, italic underline) which has zero to do with the valve.