Does this seem right?
Posted: Tue Jun 29, 2010 3:02 pm
I am designing and airsoft gun and GGDT seems to be giving very good results, higher than I expected...
I normally leave the flow Coef alone, it is hard to know what it really is. The chamber data is right. The OD is actually the ID of the chamber and the ID is what you put as zero.jrrdw wrote:ID '0'. Flow Coef '45%'. Are you sure those numbers are right?
Reservoir -> Outer Diameter
GGDT assumes that the reservoir is a right cylinder with a longitudinal void in it. The outer diameter input corresponds to the outer diameter of the reservoir cylinder. Note that we are talking about the outer diameter of the air volume, not the outer diameter of the piece of pipe you might use to actually make such a reservoir; it is instead the inner diameter of that pipe (which defines the outer diameter of the reservoir volume). Clear as mud?
Cool, then I guess my gun will be pretty good for airsoft wars The volume was what I was looking at, only 3 inches long... That is the smallest piston valve I can easily build so I don't care if it is overkill cause that valve only costs about 5 bucks to make.SpudBlaster15 wrote:Looks about right. Even though the chamber pressure is low, you're using a piston valve with VERY overkill flow, a 36" barrel, and lightweight projectiles. 660fps with a .12g airsoft round isn't exactly difficult to achieve.