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October 26th, 2005, 22:49  #1 
velocity and energy limits for canada
i was just doing some rough calculations after digging up a physics book from university about 15 years ago. i know that the firearms limits for airguns (airsoft included?) is 500 fps and 5.7 joules of muzzle energy. these were the numbers i came up with:
0.12g @ 715.1 fps = 5.7j 0.20g @ 553.8 fps = 5.7j 0.25g @ 495.4 fps = 5.7j 0.36g @ 412.8 fps = 5.7j 0.43g @ 377.7 fps = 5.7j if there are some university guys out there that could check my numbers that would be appreciated. just thought i'd spend a little time procrastinating from doing my paperwork. i just ran the velocity calculator at arnie's airsoft and these were their numbers: 0.12g @ 1014 fps = 5.7j 0.20g @ 785.5 fps = 5.7j 0.25g @ 702.5 fps = 5.7j 0.36g @ 585.5 fps = 5.7j 0.43g @ 535.5 fps = 5.7j i trust arnie's number over mine as computers are never wrong. i haven't had to do that calculation in years but these computers make things so easy now. interesting how with heavier bb's the limit seems to be reached much more easily. 

October 26th, 2005, 22:55  #2  
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Still does not makes sense.. 328 with 0.2 g BB is equal to one Joule, yet 553.8 is 5.7?
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October 26th, 2005, 23:06  #3 
i just used the calculation of 1j = kg x (m/s)^2 and converted to fps. that's why i was hoping some guy with really good math would verify my numbers and see if i'm right or just full of shit.


October 26th, 2005, 23:17  #4 
AS far ad I remember it is OR. not AND.
that means if your gun shoots more than 500fps  it's a firearm 

October 26th, 2005, 23:19  #5  
Your equation is wrong. Add 0.5 in front of your kg.
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http://www.cfccafc.gc.ca/info_forr.../airguns_e.asp 1. Air guns that are firearms for purposes of both the Firearms Act and the Criminal Code. These are air guns with both a high muzzle velocity (greater than 152.4 meters or 500 feet per second) and a high muzzle energy (greater than 5.7 joules or 4.2 footpounds). The “muzzle velocity” is the speed of a projectile at the instant it leaves the muzzle of a gun, normally expressed in metres per second or feet per second. The “muzzle energy” is the energy of a projectile at the instant it leaves the muzzle of a gun, expressed in joules or footpounds. Air guns need to meet both standards to be classified as firearms for purposes of the Firearms Act. 

October 26th, 2005, 23:22  #6  
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KD
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October 26th, 2005, 23:23  #7  
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October 26th, 2005, 23:24  #8  
To Be Required to register.. and
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Under 500 FPS and/or 5.7 J are still firearms, but not required to register.. Quote:
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If they would just remove the words 'low muzzle velocity' from this... we're all screwed :tup: Quote:
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October 26th, 2005, 23:25  #9 
i checked the cfc website and it is both velocity and energy for airguns. so where did i miss the .5? if its .5joules = kg x (m/s)^2 then my numbers will be half the actual. if it's joules = .5 kg x (m/s)^2 then my numbers are double (not likely). could you type me out your formula as the one in my 1990 u of a text says joules = kg x (m/s)^2 and i'm too old to remember from that long ago. thanx.


October 26th, 2005, 23:32  #10  
8=======D

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remember.. that the bbs are .something of a gram .20= .0002kg yes?
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October 26th, 2005, 23:34  #11 
Le Roi des poissons d'avril

using my velocity calculator, I have 784 fps with 0.20g for a total of 5,698 joules.
450 fps with 0.20g = 1,877 joules 400 fps with 0.20g = 1,484 joules
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October 26th, 2005, 23:37  #12 
Aiee! Math and law make W.K.Shuridys head hurt.
I stole the equation from the link to Arnie's above. I did it manually and it seems to work, though math was never my strong point. I'd think if the calculator was faulty someone on Arnie's would've pointed it out by now. I think the Joule/velocity consensus is the projectile must meet 500 fps AND 5.7J to be classified as registerable firearm. 

October 26th, 2005, 23:40  #13 
i thought that in an age of adjustable velocities for some guns, it was an intriguing thought and it's still keeping me from my paperwork (YES!!!).


October 26th, 2005, 23:50  #14 
It's definitely a valid concern! However given the pressures that typical airsoft propellants work at it seems we're not capable of achieving firearm velocities without significant modification. The KJW M700 for instance can have the magazine drilled and tapped to accept a constant air system, which I'm told can go stupid fast. I've read reports of guys in the Phillipines shooting at 900+ fps (inanimate targets only of course!).


October 26th, 2005, 23:54  #15 
ive heard rumors of guys shooting 500++ with .43g bb's with that new m700. has anyone actually acheived those numbers with field chrony's or just on "the test bench". all i can say is OUCH!!!



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