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Old 06-23-2010, 12:20 PM #22
Mephysteaux
Pronounced Meh-Fist-Oh
 
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Join Date: Jul 2006
Location: Philadelphia
Mephysteaux owns a Planet Eclipse Ego
Mephysteaux owns a Planet Eclipse Ego
The problem I see with a down range chrono is that you're not necessarily going to be able to get the ball in the area where it can read every time. Like, I remember shooting crappy paint on a rainy day one game, and my shots probably had about a 15 foot spread, they were hooking in every which direction. Getting your shots to reliably go through the 3"x3" are you'd need it to for the chrono to read it would be kind of difficult, and I think discounting the shots that don't do that may throw your results.
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Old 06-24-2010, 08:02 PM #23
CNCRouterman
 
 
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Good information. I am not sure of my chrono's window, but I believe it is a good bit larger than 3" x 3". Only testing will confirm that.

I envision placing the second chrono far enough down range to be able to discern significant velocity changes, but not necessarily at 120' down range. I did know that PBs do not track all that well, that was one of the highlights of this discussion. I do NOT know to what extent they wander, nor what to expect for group dispersion.

As for getting two data points per shot, that may not be a reasonable expectation. I do think that getting two data points for SOME shots (at some logical mid range for the second chrono) is somewhat reasonable to expect. The cases where two data points are recorded, even if the exception, should still provide very useful check points, something like inspecting random samples of a manufacturing process looking for trends in deviation.

For this experiment, those golden PBs that yield two data points will help confirm initial FPS base line numbers during the test series, as well as a definitive delta V, one of the prime questions the experiment is designed to answer.
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Old 06-27-2010, 10:25 PM #24
Homelessballerz
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Join Date: Jun 2009
Location: On a bench
Homelessballerz supports Pev's Paintball
although apex requires upward energy, perhaps the spin sheds air better? Just a thought.
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Old 06-27-2010, 10:31 PM #25
kalebach
 
 
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Join Date: May 2009
Location: kingston, ontario, CA
Quote:
Originally Posted by BtBrawler View Post
SO I have a TM15. I wanna put an apex on it. I have the piece but the adaptor is a JJ and it doesn't fit. It has to be the barrel that's on there. What should I do?
just get a new barrel and yes u can, ive seen a few ppl at my field with apexs on their tm15s
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