Tiberius Sniper Rounds, Info from TK

[turbo chicken]

Does this also change the optimal length of barrels? Does it change the sound signature of the marker?

wondering the same thing on barrel length

[doc_Zox]

I am wondering if there is an optimized chamber design that will insure repeatable set ups

IMHO part of the inherent "inaccuracy" of the 68 cal paintball ballistics is the non uniform, lop sided paint and its random, high speed chambering.
Aligning the seams is prolly a waste of effort with gel rounds, but i gather these perfect circle engineered rounds are a Polystyrene shell. Hence the temp & humidity tolerance.
These rounds might benefit from a precision controlled feed.

[Spider-TW]

These were released to where?

I would buy some right off just to tinker with.

[mostpeople]

btw, high reynolds numbers are turbulent, low numbers are laminar, the dip inbetween is transitional.

Did you read the analysis? High Re is turbulent, but when dealing with a sphere that turbulence is a bonus. At higher Re the Cd is lower, it was proven.


As far as spin goes, the fins will exert a force on the surrounding air, causing resistance, and more drag. Spin will stabilize the ball you are right.

Who is to say though, that every paintball doesn't have some form of spin on it when it comes out of the barrel?

[Lohman446]

Who is to say though, that every paintball doesn't have some form of spin on it when it comes out of the barrel?

TK and the high speed camera testing done to measure for it with publically posted results

[mostpeople]

TK and the high speed camera testing done to measure for it with publically posted results

Did they spin? Do you have enough length of footage to know if they spun?

[Lohman446]

Did they spin? Do you have enough length of footage to know if they spun?

They did not spin, it was pretty good, controlled testing.

[mostpeople]

Manike made a "bullet" shaped (exact same as the FN303 round) "paintball" that weighed the same as a normal paintball. These have groves that spin the round when it is fired. It flew worse than a paintball. They just don't have enough mass for their frontal area.

http://automags.org/forums/showthrea...&page=11&pp=30

Did anybody bother doing a Cg exam on these paintballs as well? When you talk aerodynamics, the Cl and Cg are very.. VERY important.

[Lohman446]

http://automags.org/resource/tech/to...spinning.shtml

That discusses spinning, or attempting to induce controlled spin, a regular paintball

[Spider-TW]

If you've ever been on the far end of a working tippmann flatline barrel, the difference between a good backspin (which reduces turbulence by keeping the boundary layer attached longer and creates lift) and a knuckle ball is pretty apparent. A flatline barrel with Perfect Circle round paint would be an interesting test since its effects would be reduced without any seams, but would be more consistent.

From high speed photographs, you can see that spinning projectiles, even smooth ones, create different axial wakes compared non-rotating projectiles. The wake is usually elongated and affects the overall ballistic coefficient. Gyroscopic forces do not necessarily create absolute stability, as evidenced by the varying rate of twist in the same rifles shooting different weights of bullets. Wake stability has to be balanced against rotational inertia, center of pressure and center of mass (and sectional density).

Since a paint ball travels at varying speeds starting at 280 fps and decelerates, the reynolds numbers will be continuously falling and the drag coefficients will be changing. There is not a single coefficient, but a set of coefficients through the path.

I would much rather have some to play with.

[mostpeople]

If you've ever been on the far end of a working tippmann flatline barrel, the difference between a good backspin (which reduces turbulence by keeping the boundary layer attached longer and creates lift) and a knuckle ball is pretty apparent. A flatline barrel with Perfect Circle round paint would be an interesting test since its effects would be reduced without any seams, but would be more consistent.

From high speed photographs, you can see that spinning projectiles, even smooth ones, create different axial wakes compared non-rotating projectiles. The wake is usually elongated and affects the overall ballistic coefficient. Gyroscopic forces do not necessarily create absolute stability, as evidenced by the varying rate of twist in the same rifles shooting different weights of bullets. Wake stability has to be balanced against rotational inertia, center of pressure and center of mass (and sectional density).

Since a paint ball travels at varying speeds starting at 280 fps and decelerates, the reynolds numbers will be continuously falling and the drag coefficients will be changing. There is not a single coefficient, but a set of coefficients through the path.

I would much rather have some to play with.

How far do you think the reynolds number will drop though? my guess is not far at all, and it would fall for both projectiles to boot. After 100 feet, how many fps have dropped? Im too lazy to try and find out, is there a test that has been done?

As to the bolded section, you are talking about a spherical section filled with a fluid, that will be pretty difficult, and require pretty tight machine tolerances.

The more I think about it, the more I think these will be less accurate than a regular paintball. They would have to be very well balanced around that central axis to not spin out like a ceiling fan missing 1 blade.

I would really like to see some tests!

[PanzerGen]

First "test" I have seen.

edit...link removed

The only problem is that you can't see the paint itself due to the video quality.

[AGD]

Guys,

First off a clarification, you can barrel load these projectiles by pushing them backwards down the barrel. You put them in with the round part FORWARD and the fins toward the bolt like you would expect. I was informed that I said "load them backwards" which some people took as positioning the projectile round end toward bolt.

These projectiles are a direct result of the 10 years of experience we have with the FN303 rounds. You remember, the only paintball projectile used by the government and all that? We reduced the weight to 3 grams and moved it all to the front for good center of gravity. The back of the ball actually has a slight taper where the fins are so the fins are not actually in the main airstream but rely on the airflow to "stick" to the sides of the ball like an airplane wing.

The fins are more aggressive than the FN rounds and since its lighter we think these spin up FASTER and this gives stability to the ball. This created a level of accuracy that even we were surprised with.

The shape gives it better aerodynamic flow so this round holds its velocity down range a LOT longer than a regular paintball. In my discussion with Gary today he told me that when a regular paintball slows down to 125, the Sniper Round is still doing 235 at the same distance. We believe people with think your shooting hot when you touch them at distance.

We have sent out projectiles to people for testing and there is going to be a video from Tiberius coming out tomorrow. These projectiles were half hand made to make the show so there is no streamlined production yet, but that is happening soon.

Stand by and everyone will get a "shot" at these

AGD

[AO Moderation Team]

First "test" I have seen.

edit...link removed

The only problem is that you can't see the paint itself due to the video quality.

Please dont post links to vids with swearing. The link was removed. Nothing like dropping the F bomb. Could someone tell this Mike guy at TechPB that it would be alot more professional if he could make a vid without all the swearing it makes him sound less cool.

[PanzerGen]

Opps, I didn't think about the swearing when I made the link, sorry.

Anyways, I think this is a cool idea. If they work well, someone should make an x-mag breach for them so at least one AGD marker can use them effectively