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Flatline Theories...

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Post Options Post Options   Thanks (0) Thanks(0)   Quote You Wont See Me Quote  Post ReplyReply Direct Link To This Post Posted: 10 October 2005 at 8:03pm
I'm still searching for the article, I'll have more time for it later tonight.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote roader Quote  Post ReplyReply Direct Link To This Post Posted: 10 October 2005 at 7:56pm
when i used a flatline i found that they didnt hit as hard and i had more bounces
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Post Options Post Options   Thanks (0) Thanks(0)   Quote UV Halo Quote  Post ReplyReply Direct Link To This Post Posted: 10 October 2005 at 7:48pm
Thanks for the replies!


You Wont See Me-

I've never seen this article you mention so, it would be an interesting read for sure.  However, the only time I have seen mention of anything reducing drag on a spherical object (allowing it to maintain it's horizontal velocity longer), is dimples on a golf ball.  This site describes the effect of the dimples as well as backspin on golf balls.

The Painball Trajectory Calculator with the default settings show that a standard 280fps shot, with no elevation, with the barrel 5ft above the ground,  at .551 seconds into flight, will be moving at 139.7fps, and will fly for a total of 113.1ft.
   While a backspinning shot  (at 12,340RPM) at .551 seconds into it's flight will be moving at 137fps, and will fly for a total of 157.1ft.

It's most important to note that this calculator doesn't account for small factors like seams, or air temperature.  It also assumes there is no wind.  It still predicts a difference of 2.7fps.  This could be overwhelmed by things like a tail wind, or combinations of such in real world testing.


Edited by UV Halo
M98C- W/QwkStrpCut
Comp Air & Palmer Fatty Stab
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Lapco Sight Rail W/ADCO 30MM EDOT
Qloader W/ CMS
Freak SS W/Stif-Tip * Flatline * Armson Stealth
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kuhndog599 Quote  Post ReplyReply Direct Link To This Post Posted: 10 October 2005 at 7:22pm
wow u guys are smart
model 98 - homemade handguard
solid stock - opsgear mag
polished internals
homemade sling - paintjob
operator barrel
progressive barrel
opsgear mag - stock
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Post Options Post Options   Thanks (0) Thanks(0)   Quote spudcrazy Quote  Post ReplyReply Direct Link To This Post Posted: 10 October 2005 at 7:18pm

UV Halo...You observations and research are correct.  There is no velocity change on a ball once a gun is chronoed.  If you chrono a flatline and a stock barrel and both are set at 285fps, then they are both at 285fps...exact same velocity.  There is no way the velocity will increase unless you reset the velocity screw or have "hot" CO2 issues.  (As a side, most field chronos are nothing more than a radar gun, which detects doppler shift, so generally the ball speed is measured after about 10 feet from the barrel.)  You are also right about the backspin creating lift to keep the ball up longer.  The backspin basically creates a low pressure (might be high pressure, I forget), that allows the ball to stay up longer.  Much like the vortex effect from an airplane wing....As far as it hurting more, or making the ball break easier, I can only guess that this too has to do with the backspin.  If the ball hits with a spin, it is more likely that the shell will "rip" and break, versus a "knuckle ball" with no spin.  Try to throw a water balloon at a sheet hanging from a clothesline.  If you are successful enough to get a spin on the balloon, I guaruntee it'll break on the sheet.  If you knuckle ball the balloon, it might very well just hit the sheet and fall to the ground.  Now as far as what "You Won't See Me" said.  That's correct too.  The backspin will allow gravity to be defeated a bit longer, thus at a given distance, the velocity might be maintained longer.  However, it is impossible to "gain" velocity from a backspin.

SO, your thoughts and opinions are absolutely correct.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote You Wont See Me Quote  Post ReplyReply Direct Link To This Post Posted: 10 October 2005 at 6:43pm
Personal observation from being on the field: The flatline does seem to hurt more when you get shot with it.

Tests have been done ahwile back that show a normal barrel will lose velocity faster than the ball from a flatline. That would explain his "hitting harder" theory because the balls are indeed at a higher velocity than a normal paintball at that distance.

I'll try to find them and get you a link if possible.


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Post Options Post Options   Thanks (0) Thanks(0)   Quote UV Halo Quote  Post ReplyReply Direct Link To This Post Posted: 10 October 2005 at 6:36pm
Over in the Markers Gallery, KillerOne made the following statements:

"Tried multiple barrels - preferred A-5 Flatline due to ruggedness and increase range, shots hit harder."

"...expecially the way i've got it - it put a spin on the ball which does two things:

1. farther shots

2. harded shots.

Just like a baseball."

"Thanks to the laws of Physics - When you put a backspin on a ball (just like the flatline does) the result is acceleration and distance; increasing the Maximum Effective Range of my A-5 and anyone else using a flatline."

Personally, I find this to be garbage.  Everything I have seen in websites,  discussions on the topic, High School, and College level physics (granted only 100 level) leads me to believe that the backspin on a paintball gives the paintball lift which temporarily reduces the effect of gravity, allowing it to fly further down range before it hits the earth.  I've even found two calculators that show the effect of backspin on a ball.  The first here, and another through a link he even replied with, here.
 Everything I have seen through the use of my flatline (and being shot by a flatline) tends to agree with the first calculator (the second isn't designed specifically for a paintball but, explains the same theory).  The shots fired from a flatline fly farther but do not hit with more force than a non-backspinning ball.

What do you all think?  I would prefer to keep this intelligent, and it would help if you could site your sources.  Feel free to include your personal observations just be sure to identify them as such.



Edited by UV Halo
M98C- W/QwkStrpCut
Comp Air & Palmer Fatty Stab
Gas-Thru Stock
Lapco Sight Rail W/ADCO 30MM EDOT
Qloader W/ CMS
Freak SS W/Stif-Tip * Flatline * Armson Stealth
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