[andrewthewookie]

naterab, on 08 October 2012 - 01:10 PM, said:

I'm not exactly sure what we would be calculating. The formula for kinetic energy is 1/2mv². I put in the information, changing grams into pounds, and I got like 55 fps or something lol.

We can calculate the energy of a paintball at 300 fps. In the case of 3.2g and 300fps, we get 13.37 joules, which is 9.86 ft-lbs.

In Germany, I believe they regulate the paintball gun so that it cannot shoot a paintball that has more than 7.5 joules of energy. Taking that with the weight, we have 7.5 = ¹/₂ (.0032)v². Completing that equation gives us a velocity of 68.57 m/s, which is just under 225 ft/s

The test of "shoot it and see what seems reasonable" is adequate in my opinion, since there's been no calls for reducing the limit under 300 fps. Many fields voluntarily choose to use a slower limit, but nobody considers up to 300 fps dangerous compared to 285 fps or slower.

This post has been edited by andrewthewookie: 08 October 2012 - 01:47 PM

[AMcNett47]

naterab, on 08 October 2012 - 01:10 PM, said:

AMcNett47, on 08 October 2012 - 10:03 AM, said:

I believe the way to calculate it is using the formula for kinetic energy. Correct me if I'm wrong, but I believe its Force=Mass X Velocity. Again, its been a while since I've been calculating that stuff, so take this with a grain of salt.

I'm not exactly sure what we would be calculating. The formula for kinetic energy is 1/2mv². I put in the information, changing grams into pounds, and I got like 55 fps or something lol.

yeah I knew that wouldn't be right. Let's use your formula. Someone mentioned 3.2 grams as the mass of a paintball so let's use that. 3.2 grams equals .0032 kg and 300 feet per second equates to 91.44 meters per second. Using the formula that equates to 13.37 joules, 9.86 ft/lbs. But that's assuming that the paintball will hit a target and dump 100 percent of it's energy at point blank. For a paintball at range you would have to calculate gravity and air resistance and I'm not in the mood to do that. So yeah, I have no idea if I answered you're question

EDIT: andrewthewookie literally posted exactly what I just typed lol

This post has been edited by AMcNett47: 08 October 2012 - 05:45 PM

[canon fodder]

I forgot the squared part in the calculation of ft/lb, so I'm probably wrong with my suggestion of 165fps as being legal for pistols in the UK. Can someone with more brains work out 6 ft/lb with a 3.2g ball?

[slinkyaroo]

Insurance companies restrict outdoor to 300 FPS and indoor to 250 FPS.

Only a few companies will insure PB in Canada and this is part of the TOA. I read them and there is a few other things involved.

[andrewthewookie]

canon fodder, on 09 October 2012 - 07:00 AM, said:

I forgot the squared part in the calculation of ft/lb, so I'm probably wrong with my suggestion of 165fps as being legal for pistols in the UK. Can someone with more brains work out 6 ft/lb with a 3.2g ball?

6 ft-lbs is 8.13 joules, so when plugged in we get 61.24 m/s, which is about 201 ft/s.

[Deftone]

NJC, on 15 June 2012 - 02:34 AM, said:

pb=life, on 14 June 2012 - 09:11 PM, said:

Kynan, on 13 June 2012 - 09:54 AM, said:

A couple weeks ago I got shot pointblank in the ear from this kid who we later found out was shooting 330 FPS. Yea it sucked... I had a burning feeling in the ear for about a week after.

how'd you get shot in the ear? Every mask that I know of has something covering your ear, even the proflex.

ear shots hurt like a bitch with proflexes

Yes they do...I have the scar to prove it. I had to have surgery on my right ear lobe because of that...Back when I was cool kid and had gauged up ear rings I was diving into the snake on a hyperball field and took one right on the ear lobe/ear ring "Small soft ears on a JT Proflex/Flex7" and the trauma from it caused scar tissue in my ear lobe..Dr. cut it open, cut all the scar tissue out and sewed it back up...No more ear rings for me, lol.