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Old 11-06-2009, 04:27 PM   #21 (permalink)
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The difference between the two moving at the same speed will probably be negligible.

For every one else... Force of Drag is calculated from:

Fd = 6*a*pi*u*v

Where u = coefficient for dry air
pi = 3.1415.....
a = projectile front cross sectional radius (for a sphere it is the radius)
v = velocity

You can see my instantaneous force of drag calcs for a .68 cal ball dropped from a height in this thread:
.50 Caliber Paint Data and Test Video - Part 2

If velocity was constant through the flight... well the .50 cal ball has a radius that is about 26% smaller.... so the force of drag on the .68 would actually be greater, at least with regards to effect by the radius. The difference will be the change in velocity through out the flight.

so it comes down to a wonderful solving for dv/dt for the flight of each ball because the velocity changes throughout the flight. Not what I consider a fun friday afternoon.

And yes.. I know I could be wrong. It's probably been about 12 years since I've solved that type of calc.

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Old 11-06-2009, 04:30 PM   #22 (permalink)
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Found it... yeah. a frick'n dv/dt problem that I can't plot by hand.

http://www-teaching.physics.ox.ac.uk...elims/CO52.pdf

E
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Old 11-06-2009, 04:31 PM   #23 (permalink)
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yep, thats a test i can't wait to do - dual chronos on the 50 cal.

should confirm or deny a lot of different things.
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Old 11-06-2009, 09:53 PM   #24 (permalink)
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Quote:
Originally Posted by alpha434 View Post
.....The tough part is how to get it up to 3.2 grams.
..
Why not make them full round with wings as opposed to the half round with wings on the .68. You'd be making brand new molds anyways. Is there something else that prevents the paint section in first strike rounds from being spherical?
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Old 11-06-2009, 09:55 PM   #25 (permalink)
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Originally Posted by ta2maki View Post
Why not make them full round with wings as opposed to the half round with wings on the .68. You'd be making brand new molds anyways. Is there something else that prevents the paint section in first strike rounds from being spherical?
the closer the center of mass is to the front of the round, the better it will fly and the better it will spin up.
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Old 11-06-2009, 10:12 PM   #26 (permalink)
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Old 11-07-2009, 12:52 AM   #27 (permalink)
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Originally Posted by Schmitti View Post
Wha?

I already proved that the effects of drag on a paintball is negligible. We're talking force of drag on the order of 0.00000x lbs. Negligible. So what makes a .50 better than a .68?

E
Empirical evidence suggests otherwise.

Why would a paintball slow down at all if there was no drag?


I was totally assuming that .50 would be better than a .68 because it has less frontal profile.
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Old 11-07-2009, 05:24 AM   #28 (permalink)
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I haven't seen all the threads pertaining to .50 vs .68 but, back in the 80's we had the .62 vs .68 and without upping the velocity of the smaller ball, (we used to shoot .62 at 325-340 fps.) they won't fly as far, or as accurate as a .68.

It's a weight issue.
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Old 11-07-2009, 08:32 AM   #29 (permalink)
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Originally Posted by hmudd13 View Post
I haven't seen all the threads pertaining to .50 vs .68 but, back in the 80's we had the .62 vs .68 and without upping the velocity of the smaller ball, (we used to shoot .62 at 325-340 fps.) they won't fly as far, or as accurate as a .68.

It's a weight issue.
And to save you from reading them. It is still a weight issue. 50cal is about .3-.5 grams short and can only be used at 300fps or less.
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Old 11-07-2009, 10:43 AM   #30 (permalink)
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Quote:
Originally Posted by alpha434 View Post
Empirical evidence suggests otherwise.

Why would a paintball slow down at all if there was no drag?
One... the difference between the two may be insignificant.... If you want to run the numbers please do.

Why would the ball slow down... well you have introduced a vertical force on the ball (gravity)... I would think that it has an effect on the ball... otherwise it's flight path would not be a ballistic curve.

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