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Very quickly I need some stuff for a report. Rate Topic: -----

#1 User is offline   Tots 

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Posted 08 November 2007 - 05:47 PM

I need 5 sources to back up whether a paintball is faster then a reball while shooting with the same amount of gas. I've tried Google, and some other stuff, to no avail. Basically I need some physics stuff, and some stuff about reball fields...


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#2 User is offline   UWANNAGO 

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Posted 08 November 2007 - 05:48 PM

Its not.

The reason why they make you shoot lower is because there more painful at high velocities.

At least thats what ive always been told/under impression.

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Teddy K
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#3 User is offline   Tots 

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Posted 08 November 2007 - 05:50 PM

View PostTeddy K, on Nov 8 2007, 07:48 PM, said:

Its not.

The reason why they make you shoot lower is because there more painful at high velocities.

At least thats what ive always been told/under impression.

Peace,
Teddy K



I understood they were heavier?

I still need the stuff, I will "find" that out during the experiment, and change my hypothesis, but if I do it now I will need to revamp the whole project. So I still need 5 sources.

This post has been edited by Tots: 08 November 2007 - 05:52 PM

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#4 User is offline   P V 

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Posted 08 November 2007 - 05:53 PM

View PostTeddy K, on Nov 8 2007, 05:48 PM, said:

Its not.

The reason why they make you shoot lower is because there more painful at high velocities.

At least thats what ive always been told/under impression.

Peace,
Teddy K



thats not what he asked.. you didn't answer his question...
edit and straight from the reball site faq
Q. Do Reballs™ hurt?
A. Reballs™ do not hurt any more (or less!) than a real paintball. Just do the math! Joules equation (joules is impact energy) Grams*fps=*/100=joules

-----

to the poster, that's an interesting question, i wonder if a reball would cause you to use more gas to shoot the same FPS... hmm.

i'll look around for you, see if i can find anything.

This post has been edited by P V: 08 November 2007 - 05:55 PM


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#5 User is offline   Tots 

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Posted 08 November 2007 - 06:04 PM

I still haven't found anything...

Oh great...
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#6 User is offline   Puzuma 

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Posted 08 November 2007 - 06:06 PM

What you are asking is if anyone has chrono'd their marker to be field legal using paint the rechronoing with reballs to see if there is a velocity difference?
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#7 User is offline   Matt 

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Posted 08 November 2007 - 06:09 PM

ok. Here is your physicis lesson, just because we are going over it now.

First, the equation for kenetic energy is KE=1/2mv(squared)
so, to find which one shoots faster (KE) you need the mass of each one. You than need to convert that mass, which will most likly be grams, into kilograms. Than get the velocity, and turn that into meters per seconds. so you will than mulitply 1/2 times the mass of a paintball times the velocity of the paintball squared. do the same with the reball than compare :dodgy:
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#8 User is offline   Ethrealwolf 

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Posted 08 November 2007 - 06:15 PM

View PostPuzuma, on Nov 8 2007, 05:06 PM, said:

What you are asking is if anyone has chrono'd their marker to be field legal using paint the rechronoing with reballs to see if there is a velocity difference?



i think puz is closest.

what you're asking is, if a marker, using the same volume and pressure of gas, will shoot a 'live' paintball faster (Higher FPS) than a reball ?
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#9 User is offline   Tots 

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Posted 08 November 2007 - 06:30 PM

View PostEthrealwolf, on Nov 8 2007, 08:15 PM, said:

View PostPuzuma, on Nov 8 2007, 05:06 PM, said:

What you are asking is if anyone has chrono'd their marker to be field legal using paint the rechronoing with reballs to see if there is a velocity difference?



i think puz is closest.

what you're asking is, if a marker, using the same volume and pressure of gas, will shoot a 'live' paintball faster (Higher FPS) than a reball ?


In a nutshell. But I need some sort of internet/book source so that I can use it in a bibliography...


le sigh....
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#10 User is offline   Matt 

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Posted 08 November 2007 - 06:33 PM

if someone has the mass of a reball and mass of a paintball, i'll figure it out.
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#11 User is offline   SHRIMPED! 

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Posted 08 November 2007 - 06:35 PM

I can't do all the math for you... because... well I suck at math.

But if a paintball is fired out of a barrel using 150psi, and chrono's at 300fps - a heavier object (reball, they're made of rubber iirc) will not go as fast using the same amount of pressure (150psi).
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#12 User is offline   Matt 

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Posted 08 November 2007 - 06:39 PM

tots, i would assume you go on pbn. well Mann's test, he measured a few of his paintballs that he used, and of the reballs. so i have the masses. i'll do the work and show it to you. i took a few of the paintballs weights and averaged them.
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#13 User is offline   Tots 

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Posted 08 November 2007 - 06:42 PM

View PostMatt, on Nov 8 2007, 08:39 PM, said:

tots, i would assume you go on pbn. well Mann's test, he measured a few of his paintballs that he used, and of the reballs. so i have the masses. i'll do the work and show it to you. i took a few of the paintballs weights and averaged them.


The sad part is, manns test wont due, becuase its on a forum.

View PostSHRIMPED!, on Nov 8 2007, 08:35 PM, said:

I can't do all the math for you... because... well I suck at math.

But if a paintball is fired out of a barrel using 150psi, and chrono's at 300fps - a heavier object (reball, they're made of rubber iirc) will not go as fast using the same amount of pressure (150psi).


They move "smoother" in the barrel. Less friction = higher fps. I really don't know, I'm trying to find out.
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#14 User is offline   thebostinian 

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Posted 08 November 2007 - 06:48 PM

this is more for teddy k's comment...

the reason reballs hurt more than regular paintballs is because they undergo a greater momentum change during impact, because they bounce. if positive velocity is towards the target, then a regular paintball winds up attached to the target, with a final velocity of zero. the reball bounces back towards the shooter, giving it negative velocity, so its change in velocity is greater if fired at the same initial speed. since momentum is defined as p=mv, and change in momentum (for sake of argument, /\=delta), /\p=m*/\v. the greater the change in velocity, the greater the change in momentum. and since momentum is conserved in a system, whatever change in momentum the reball has is balanced by the change in momentum to the target. greater /\p means it hurts more.

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#15 User is offline   agentM192 

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Posted 08 November 2007 - 06:49 PM

Well more mass = more inertia thus more speed...I think. Don't hold me to that.
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