Quick Joule Test Using a Coke Can

[jeffery7466]

Hello guys,

I am not sure if you guys knew this, but a quick way to (roughly) test the energy of a gun is by shooting into a coke can.

Using 0.2g bb pellets, hold the muzzle about half an inch away from the surface of the can, at right angle, holding the can in place:

• Shooting into the side, if the pellet penetrates only one side and remains in the can >1 joule
• If the pellet penetrates one side and tears (not a clean, round hole) through the other ~1.2 joules
• If the pellet penetrates both sides cleanly (nice round holes) ~1.4 joules
• Shooting into the bottom of the can, if the pellet penetrates the centre of the bottom ~1.6 joules
• If the pellet penetrates near the rim of the can ~1.8 joules

This is the case with the older 350ml cans, but they only selling the slightly thinner 330ml cans now. Shouldn't make much of a difference, but please do bear this in mind!

Convert the energy into fps or m/s using the kinetic energy equation we all loved from school - E=0.5*mass(kg)*speed(m/s)^2

350fps with 0.2g pellet is about 1.14 joules.

I hope this helps.

Stay safe!

EDIT: the can must be empty first!

 

[jcheeseright]

nice copypasta.

FYI 330ml has been the standard sized can in the UK for as long as I can remember... and I am OLD.

 

[jeffery7466]

haha, more like translate!

Hmmm funny that, cause it has always been 350ml in Hong Kong until a few years ago...

 

[CaptainDumbass]

So, tell me why my gbb pistol that fires consistently at 290fps (i own a madbull chrono) can penetrate a coke can from half an inch away????

 

[Tariq]

This is the case with the older 350ml cans, but they only selling the slightly thinner 330ml cans now. Shouldn't make much of a difference, but please do bear this in mind!

Shouldnt make much of a difference??? It makes a hell a lot of a difference. Plus the materials change between cans. Some are aluminium alloys, some are steel alloys.

 

[jcheeseright]

essentially, it's not a poor man's chrono it's a feed of bullshit.

you wanna know how hot your gun is shooting? chrono it.

 

[dex]

essentially, it's not a poor man's chrono it's a feed of bullshit.

you wanna know how hot your gun is shooting? chrono it.

Exactly, this post is arsegravy of the lowest order.

 

[jeffery7466]

Exactly, this post is arsegravy of the lowest order.

All right, I see how this is

This is just meant to be a crude test and did work to a certain extent.

Screw you guys, I am going home

 

[CaptainDumbass]

All right, I see how this is

This is just meant to be a crude test and did work to a certain extent.

Screw you guys, I am going home

good idea

 

[team flex]

didn't work for me, as everyone else said.

 

[Undieing_Lust]

I have tryed the coke can chrono and the results are always WAY off...

 

[ikarma70]

With all due respect but there has been numerous posts like this in the airgun community involving the use of a yellow pages phone book with similar replies to this thread.

The only way is to use a proper chrono as various factors have effects on velocities.

 

[Airsoft-Ed]

Dat necro post doe

 

[n1ckh]

^^^ its like reading a ukara debate all over again lol