well, the fundamental problem is that many things effect effienecy. right? so without either specifying or controlling all these things you test is going to have a wide variety of outcome with any given gun. i dont think there is any good way around that, but it would be interesting to take a similar setup, and use three different weigths of balls, and three different chrono speeds and see exactly how they effect the outcomes.
I don't see that as a problem. First, efficiency and the number of shots per tank are two different things. Maybe that's why we are not on the same page.
This reminds me of the accuracy tests. 'Accuracy' to most paintballers refers to the probability of hitting a given target. Unfortunately measuring that would require testing every possible target shape and size, that's impossible and unrealistic. Understandably Punkworks does the next best thing. Assume the target is always a circle and determine the target (circle) size that will result in a X % hit probability. Since your test isn't really measuring accuracy (due to reasonable limitations) I've always thought it more pragmatic to have a different name. Circular Target Impact Probability Test? CTIP?
Your efficiency test is in a similar situation in that it isn't measuring efficiency, it's measuring number of shots per set of variables. If it was possible to measure accuracy for any given target shape/size, we could take that data and apply it to any given target/range to determine the probability of impact. Measuring efficiency (instead of number of shots per set of variables) is much the same. We could take a system's efficiency then apply system changes to reasonably calculate the new number of shots or make comparisons.
What are all the factors that effect system efficiency?
Energy out of the tank - measurable
Energy invested in the paintballs - measurable
What are all the factors that effect number of shots per tank changes?
System efficiency (measured from above)
Rate of fire changes
Ambient Temperature changes
- all quantifiable
Thanks to your extensive barrel testing we know how to extrapolate system efficiency changes based on barrel changes. e.g. If a12" long 0.007" underbore was used during the system efficiency test we know using a different barrel wouldn't gain any substantial efficiency or consistency. We can get that same insight into regulator, ROF, temperature, etc changes down the road. If you were to operate backwards and measure number of shots per partially known set of variables, the results could not be used to make comparisons since the variables were not held constant. In this case Energy expelled via ball mass and velocity.
Thank you for commenting on this.
i'd argue that all those lower variables listed effects SYSTEM efficiency. if you can get a 30fps swing in velocity just due to barrel alone, that most certainly effects both efficiency and shots per tank.