The Eigenbarrel

[kwood]

will there be enough clearance for an automag bolt to fit inside this barrel when a shot is fired

[kcombs9]

will there be enough clearance for an automag bolt to fit inside this barrel when a shot is fired

Its not a Twist lock barrel I don't understand your question.

But if it helps my .689 insert fits over the LvlX bolt but not my .687

[xluben]

This barrel is available in 'Cocker threads only.

Quick video:

Planet Eclipse Geo
0.693" SL2 Barrel - 288.4fps
0.685" SL2 Barrel - 293.4fps
0.678" Eigenbarrel - 299.2fps

RPS Marballizer - Bore Matches 0.685" Back

Shot with Canon 7D
and 17-55 2.8 IS
Full 1080p24
ISO100, f/10, 1/50sec

Click the 360p button, and then select 1080p!
YouTube - Lurker Eigenbarrel - Geo - Bore vs Velocity - 1080p HD

[drg]

right, however it is significantly worse efficiency wise compared to even an unported overbore.

But better than no barrel there at all, you claim.

[georgeyew]

That's some pretty impressive numbers.

[jolt00]

im going to come out.

look every body CP is finally coming out of the closet!!


jk CP
-----------------------

how is everyone measuring the diameter of there paint?
if your using freak inserts I know that a lot of them are off size wise. They may say .689 or .683 or what ever and not be the size they say SP was never consistent.
so unless your using calipers who knows what size the paint is lol.
just saying

[chafnerjr]

look every body CP is finally coming out of the closet!!


jk CP
-----------------------

how is everyone measuring the diameter of there paint?
if your using freak inserts I know that a lot of them are off size wise. They may say .689 or .683 or what ever and not be the size they say SP was never consistent.
so unless your using calipers who knows what size the paint is lol.
just saying

I measure by my freak inserts... but I'm also anal enough to have measured those to spec with a calibrated digital vernier caliper. Our RPS up here (NH) runs .687-.689 it's the winter stuff that gets a bit smaller. Good thing I have a .687 Dye since I don't have an insert that size!

I'm really interested in these results.. I just can't believe that I could stuff a .685-.689 ball in a barrel like that at any decent rate of fire... and having watched the video I'd like to see the test done on a more consistent marker. While the under bore did average higher I was seeing variances of 30fps during the test and 15ish on the other barrels. Not that I'll dispute the averages there just seemed to be a lack of overall marker consistency.

Nice to see some real world testing of products rather than a bunch of arguments and conjecture.

[cockerpunk]

Not that I'll dispute the averages there just seemed to be a lack of overall marker consistency.

Nice to see some real world testing of products rather than a bunch of arguments and conjecture.

you'll note that ANY gun does this when you measure more then 5 or 6 shots. plain and simple - guns are as consistent as people think they are, yes, even nice ones.

[xluben]

I measure by my freak inserts... but I'm also anal enough to have measured those to spec with a calibrated digital vernier caliper. Our RPS up here (NH) runs .687-.689 it's the winter stuff that gets a bit smaller. Good thing I have a .687 Dye since I don't have an insert that size!

I'm really interested in these results.. I just can't believe that I could stuff a .685-.689 ball in a barrel like that at any decent rate of fire... and having watched the video I'd like to see the test done on a more consistent marker. While the under bore did average higher I was seeing variances of 30fps during the test and 15ish on the other barrels. Not that I'll dispute the averages there just seemed to be a lack of overall marker consistency.

Nice to see some real world testing of products rather than a bunch of arguments and conjecture.

I have digital calipers, but they are not calibrated in any way.

The Eigenbarrel was within 0.0005" of the advertised bore (both ends).

I agree with cockerpunk, a standard deviation of ~5 or slightly higher is fairly typical even with a high end gun. My paint was fairly consistent, so I don't think I'd be able to get it too much better than this even with high end paint.

If you do calculate the confidence interval and do a t-test or ANOVA, you will see that even with this amount of variation, and the given sample sizes, there is plenty of data to show that the difference in the velocity populations is statistically significant.

Here is a bit more data for you to ponder (includes the video I posted above as well as data from the next day, both Geo and Etek3).



I'll try to get a video of it shooting at 12BPS on ramping. Hopefully I won't see breaks at that rate of fire, or the barrel is of no use to me.

[FutureMagOwner]

I also want to point out with these measurements is the level of uncertainty with the measurements themselves. The only specs I could find on a chronograph was that measurements are nominally within 1% accuracy. That means a measurement of 300fps is within +/- 3fps. I wanted to mention this because this makes a pretty big difference when it comes to making any reasonable conclusion on any test in that regard.

[drg]

I also want to point out with these measurements is the level of uncertainty with the measurements themselves. The only specs I could find on a chronograph was that measurements are nominally within 1% accuracy. That means a measurement of 300fps is within +/- 3fps. I wanted to mention this because this makes a pretty big difference when it comes to making any reasonable conclusion on any test in that regard.

Yup and that's for optical chronos. Radar chronos are even less accurate.

[chafnerjr]

Fair enough... now to see 12bps or more through it.

[Enemy]

ok ill just come at as well....


why are thinking at an increased rate of fire your going to see more breaks??

and cp was getting at a 6" barrel with no porting will lose performance to a 14" ported barrel with 7" of control bore, but conversely an 8" un-ported will out perform the 14" or something to that extent.

[rawbutter]

Fair enough... now to see 12bps or more through it.

Did you ever get to do this? I was watching this thread, and then it just died.

Also, while you've showed at lot of data about efficiency and fps readings, you haven't said anything about the accuracy or the tendency of the barrel to break paint. I really don't care if a lower bore barrel gets slightly better efficiency (I shoot a mag, don't I, so why would I care about efficiency ), but I AM very curious about (a) how accurate the barrel is, (b) if the smaller bore causes more breaks, and (c) how well it cleans itself.

[drg]

There is fairly extensive discussion about this barrel on a couple other forums.