Consistency and efficiency ofdifferent setups.

[1996XJ]

Ive got a chrono and some target balls and decided to do some testing on the efficiency and consistency of different setups.
So far i have tested my VSC setup with a 11in bored CCI barrel using .670 and .682 inserts and a 12in J&J barrel (approx .688-.689).  I will also be testing a 12in microshot and 6in CCI, then i will redo the tests using a dropout changer.

Here the current results.




The velocity HAS NOT been adjusted.  It was set to shoot at 280fps though the microshot at 800psi HPA.  The paint being shot was very close in size to the target balls.

The shots were not timed, around 8-30 seconds between shots.  If the total shots do not match the rocorded shots its because the chronograph did not register the shots.  The total shots were taken until the velocity went below 200fps.  The temperature for the tests is about 60 degrees.  In the first three test about 25 "reballs" were used, further testing will be using 6 to take out some varibles in the consistency.

[1996XJ]

Slight over boring with the Microshot seemed to be the most CONSISTENT.
The .679 was picked with the blow test and seems to be the most EFFICIENT.

So far....

[thkyle]

So which barrel would you consider to be the most accurate and why?

[1996XJ]

I would say the Mircoshot based on consistency, but cosistent doesnt nessacarly mean the most accurate.

Can someone tell me if these velocity changes seem to be average for using 12s?  Ive always used bulk CO2 or13/3000.so im new to 12gs.


Updated

[idkfa]

I do like how you are showing the relation between bore sizing and velocity, but you may want to re-chrono each barrel back up to playable speeds for a practical test and comparison of the efficiency/consistency of different barrels. The number of shots from your J&J is not a truly practical number because you are starting out at 245 fps.

Besides that, I like your testing!

[1996XJ]

Right now the only thing the total number of shots might show is how well te 12 was filled.  I was using the 12gs in a lever changer last night and discovered about a 3/16in difference in length between two of them, i have to get a higher quality like crosman being doing eifficency tests.  As of right now all or the total shot theorectally should have been the same.

Its going to be hard to do rechrono to a certain speed with the velocity fluctuationg so much, it could be measured by how many turns the TPC makes to get it to said velocity.  Once ipick up some crosmns i have to do this.

Im also curious to find out if the velocity will spike in a dropout changer if the marker is carried with the barrel pointing down.

For some reason i cant get the standard deviation to work on the spreadsheat, i did get the average FPS though.

The average fps (on the second chart) does show that the efficientcy directly correlates with how much the barrel is overbored.  And that you have to sacrifice some of that efficiency for the best consistency.

AVI 12grams

[thkyle]

Nice study.

I think that the velocity fluctuations are going to be mostly due to the paintballs and a the defects from one to the other. Paintballs just aren't ball bearings.

Those numbers look to be pretty normal for a 12 gr. You could tune the gun to get them a little better, but that looks to me to be a fair average for velocity and shot count with a typical out of the box Phantom.

You do want to have some controls in place for your test results to be useful. It depends on what you're looking for. I think some tests try to get too detailed, and so people put in place controls on their testing that are just not going to be seen by the average Phantom player in the field. Your testing doesn't do that. The paintball field is not a laboratory setting, so I like the way you have approached this to far.

Here are a couple suggestions that might help to make it meaningful to the average Phantom user..............

Control - 1. THE POWER SOURCE. Get a box of the Crossman 12rs. That's going to be the most common 12 gram used. Might not be the best mil spec grade cutting edge 12 gram on the market, but it's going to be the one that most people use or can easily obtain just about anywhere. These test could be compared later to another "better" brand. At any rate, it will be useful information for the average Joe.

Control - 2. DWELL TIME. Chrono the gun to the velocity that you would use on the field with the largest bore barrel and lock it down there. Without changing the settings on the TPC, work your way down from the largest to the smaller bore barrels. This will also give the average user some useful information on the effect that bore size will have on both C&E. Of course you will need to be sure that the paint you use will fit in the "smallest" bore first.

If you changed the TPC setting with each barrel, you will lose the control on the test and the information will be useless. The idea is to determine the "influence" that bore to paint size has on the C&E of the typical Phantom, with typical internals, using typical 12 grams.

Control - 3. PAINT??? Most pump players will try to get a little better quality paint, so I would suggest doing the same for the test. Paint quality is more elusive than Heisenberg's Uncertainty Principle! There is no Planck's Constant other than the Forrest Gump version which is "Life is like a box of paintballs, you never know what you're gunna get!"

So again the object is going to be to try and match this control as best as possible to what the average pump player is going to run into at the field. And the best that can be expected is to be able to inspect a bag of the paint you buy, and if the store owner will let you, check the fit of a couple in your smallest barrel.

Most people are not going to "sort out" the best balls. That could be another test to compare to this one and see if all that work sorting out paintballs really is worth the trouble.

Control 4 - DETENTS. In my opinion you should use the CCI detents to control the location of each paintball. These are something that come with every new Phantom these days, and if the ball isn't located in the same place with each shot, none of the above controls will be very meaningful.

Also you aren't testing barrels with "inserts." again this could be another test to compare with your and see if there is really any advantage to "inserts?"

Control 5 - TEMPERATURE. All the tests should be done at about the same temperature and time between shots. Doesn't matter what they are, just be consistent, and note what these are on the test.

These are just some ideas. I feel that it would be more practical for players to have the controls of the experiment set to match as much as possible what they face at the field. Things that they can actually control themselves, rather than a test that someone at M.I.T. would perform.

This would product a base test that could be useful for other comparison test later.

[1996XJ]

Real paint isnt an option right now since i threw out the indoor paintball trap i built i highschool.  And all tests are done in my basement since its about 30 degrees outside.  The "reballs" that im using are about .679 in size which is equivelent to the field paint ive been shooting.

I think i will try blowtestingall of the "reballs" and pick the most similar ones.

Detents have been used in all the tests except with the .679 insert.  I plan on testing the microshot with and without detents to see if they have any affect on velocity.

Temperature changes arent a concern as its done inside.  I will have to start timing the shots though.

Heres a list of what parts i have.
Barrels
11in CCI bored for inserts and a full freak set.
6in CCI
14in CCI
12in Microshot
2 12in ceramic J&Js

Bodies
2 RF
1 Springfeed SC

ASAs
Vertical
Dropout
Backbottle

2 sets of internals

[idkfa]

If you changed the TPC setting with each barrel, you will lose the control on the test and the information will be useless. The idea is to determine the "influence" that bore to paint size has on the C&E of the typical Phantom, with typical internals, using typical 12 grams.

There we go, now I understand. I read this over quickly during class. I figured it was a straight forward arbitrary efficiency test with different barrels, not a comparison between them. In that case 1999XJ, excellent work!