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Old 03-10-2008, 04:03 PM   #111 (permalink)
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Originally Posted by brycelarson View Post
And, once again, proven that there just isn't empirical evidence for much of anything in paintball. Even in this thread we've got intelligent people, some of whom even have education that applies to the question and no real consensus.

I think the crowd has mostly agreed that:
  • there is some friction in a paintball barrel
  • that amount of friction is small
  • the various barrel materials can all be finished to high enough levels that the differences are likely imperceptible

anything in there in dispute?
righto by me
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Old 03-10-2008, 04:04 PM   #112 (permalink)
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Quote:
Originally Posted by brycelarson View Post
And, once again, proven that there just isn't empirical evidence for much of anything in paintball. Even in this thread we've got intelligent people, some of whom even have education that applies to the question and no real consensus.

I think the crowd has mostly agreed that:
  • there is some friction in a paintball barrel
  • that amount of friction is small
  • the various barrel materials can all be finished to high enough levels that the differences are likely imperceptible

anything in there in dispute?
I will dispute that.






Nah, it's all good.

I'm all for scientific discussion relating physics to Paintball, I find it quite interesting. I just try to encourage people to develop theories, instead of conclusions.
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Old 03-10-2008, 04:37 PM   #113 (permalink)
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agreed on points, it's good to exercise the grey matter
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Old 03-10-2008, 05:01 PM   #114 (permalink)
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so what's in dispute?
  • barrel material effects accuracy
  • how much friction is in the barrel
  • paintball do / do not deform upon firing
  • barrel wear is caused by the paintball itself / or by material carried by the paintball (I think we all agree that barrels do accumulate wear)
  • shooting clean is a function of barrel material

we all know that paintballs bounce when dropped on a hard surface - for the physics people out there - does the bounce mean it's deforming? The calculation for how much pressure is acting on a dropped ball should be pretty easy to calculate - KE = .5 * M * V(squared). So, for those with better math skills than me - how fast is a paintball going when it hits the floor dropped from 6 feet? - or to keep things easier - since we're doing the weight in grams from 2 meters.

gravitational acceleration is 9.8 mps/ps btw. Is it fair to assume that once we have a KE for a paintball hitting the floor - we can compare that to the force on the ball when fired? If so, we may be able to determine if a ball should deform in the breech.

I've read the TK stuff about deformation in that glass barrel - but he was using high speed photography - right? Does anyone know how precise he was able to get?
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Old 03-10-2008, 05:11 PM   #115 (permalink)
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I'm mostly wondering this:

Suppose friction varies depending on geometry/ orientation of the ball/ seam
Variable friction means variable velocity
Variable velocity means variable consistency

So, the question is, how MUCH variance is there? Because suppose a Stainless barrel has something like a 5% variance in frictional force as compared to parallel force, between perpendicular seam and parallel seam, whereas Brass, or Tefloned ceramic is a .5% variance. That's a huge difference in consistency. But suppose it's 3% vs 2.8%, obviously negligible.

So suppose we have a brass barrel, like new, clean, polished, and minimal friction. And we have a CF barrel, used, marred/ covered in gelatin that has rubbed off and stuck, and much more friction. There could be quite a bit of variance there.

That's my argument for looking into materials.
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Old 03-11-2008, 03:15 AM   #116 (permalink)
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Well, if you cut through all the inconclusive crap, the question the OP posed was answered within the first few posts and certainly within the first couple of pages. Which isn't surprising because some of the people who answered have seen this all hashed out before.
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