^^ This. Would backpressure be the correct nomenclature? Or transferred energy via conservation of energy? IN <-- = --> OUT?
I'm not an engineer, so I may not know the correct nomenclature, but I think "backpressure" is a perfect way to characterize the force I am interested in looking at. Higher the pressure, the faster the paintball accelerates, the lower the pressure, the longer it takes for the paintball to accelerate.
I wonder if we could correlate the intensity of the highest peaks on some of these markers with pressure readings from a transducer in the breach.
If we shot both a spoolie and put it up against a Tippmann, for example, (which has a HUGE hammer) we could possibly see opposite results between under and overbores.
As in more forward momentum regardless of bore?
I think with a marker with a big hammer like a Tippmann's, the hammer would be, by far, the biggest cause of kick so much so that the backpressure effect on the marker would be masked. It's hard to imagine otherwise when you are talking about a chunk of metal that is an order of magnitude or two heavier than a paintball is.
For a Tippmann, specifically, you really need to define how the thing operates to predict whether or not more forward momentum will applied when you shoot it over bored or under bored at a normalized speed. If it has an RVA, it's trivial to say that it will have more forward momentum, because you are actually tightening the spring that shoots the hammer forward on sear release which governs the marker's dwell. With Tippmanns, the recoil in the backward vector would be in flux... and that would be the interesting thing to look at.
An Ego might show more forward momentum. Because it has an LPR, the pressure on the hammer will be static, but the pressure on the valve will be dynamic. As the pressure deceases the pressure on the valve will also decrease which could mean the hammer bottoms out (I'm assuming it does bottom out... but I'm actually not sure if it does or not) faster without decelerating as much as it would at a higher pressure.
A spoolie without an LPR would show signs of it's internals slowing down, insofar as the increased breach pressure from an under bore doesn't effect the bolt's backward momentum.
There is a lot to think about...
Edited by Troy, 15 August 2011 - 04:53 PM.