Max Bps

[Igotu]

OK I was just thinking at our certain regelated velocity wich is about 280-290 range theres only a certain max bps that can be reached, of course it would be a contous line of paint but Im just wondering if some of you guys could figure this out I just want to know how close paintball technology is to getting the MAX BPS.

[ShooterJM]

.68 inches per ball = .0566667 ft per ball. 285 ft per second

285/.0566667 = 5029.408806 bps.

By my simple math anyway. That'd be a line of balls touching each other.

[Igotu]

ok well i quess we have a ways to go or do we

[scrumpy]

I'm going to invest in a higher capacity loader after seeing that figure. Maybe I'll invest in some body armor as well, screw it I'm buying some IV nuclear missles to counter the extreme bps that is soon to come.

[SlartyBartFast]

.68 inches per ball = .0566667 ft per ball. 285 ft per second

285/.0566667 = 5029.408806 bps.

By my simple math anyway. That'd be a line of balls touching each other.

You just forgot to add the space between each ball so that the breech isn't opened for the next before the previous ball has exited the barrel.

So, you have to have a gap between each ball at least as large as the length of the barrel.

12" barrel >> 1.0566667 ft per ball >> 270 bps.
10" >> 0.890000033 >> 320
8" >> 0.723333367 >> 394

But, the real number would be lower still as the breech mechanism (bolt/door) has to get out of the way before the next ball can be chambered. Also, it's lower still as the ball being fired has to accelerate to final speed as the ball ahead travels away.

Of course, if your hopper could shoot 270bps why on earth would you need a marker?


(and I know I'm not the first to say that.)

[scrumpy]

I think the gap would have to be only as long as the space between the breech and where the porting starts, not the entire lenth of the barrel...

[mquinn96]

The maximum BPS, I think, will be determined by how fast a ball can be loaded into a breach.
Starting assumptions:
1. The ball is fired at 290 fps
2. The breach does not open until the first ball leaves the barrel
3. The breach starts closing as soon as the ball is in the breach
4. The valve will not open until the instant the new ball is chambered.

Known Constants
1. It takes about 5 ms for a ball to leave the barrel once the valve is open.
2. If a paintball is dropped from about 6 ft or higher it will start to break.

Unknowns:
1. *Some* Paintballs will break when dropped from lower heights than 6 ft.
2. The theoretical limit of how fast a breach can open or close (assume a normal bolt action and nothing fancy like a rotobreach or a trap door).

Here is how you figure max fire rate....find the terminal velocity of a paintball hitting the ground when dropped from 6 ft. Factor in air resistance (most fluid dynamic textbooks will give you equations for this).
Use that as the *maximum* speed the paint can be allowed to hit the inside of the breach at.
Assume a travel of .690" at a constant acceleration and, working back from your maximum velocity as an end condition and a velocity of 0 as your start possition you can get the number of miliseconds it takes to load a paintball.
Now, you take that number, add 5 ms for the "fire" time, and then you can either assume the bolt takes ZERO time to move or you can be more realistic and assume the bolt takes time to move.
The fastest bolt I have personaly clocked will open in 5 ms and closes in about 5 ms. This bolt was 25 grams, including the ram shaft and the hoses, barbs and ram diameter were matched for maximum speed using a flow rate of .13 CV. (that is almost three times the flow of a Karnivor settup with 1/3 the mass).

What fire rate do you get?