Is ft/b energy linear or exponential

[12gsnapcaps]

As per title, I’m wondering which is it for example, and discarding terminal and external ballistics, is 1000ft/b exactly twice as ‘powerful’ as 500ft/b (linear) or is it exponential ie: 1000ft/b is actually thrice/quadruple as ‘powerful’ as 500ft/b

I have done a google search and have not come up with any answers, or even mentions/references, to this question.

Merely an intrigue to satiate my curiosity.

Thanks all and have a nice day.

 

[Mike L]

Ft/lb

 

[Eddie P]

Linear

 

[12gsnapcaps]

Linear

Thankyou

 

[Smellydog]

Personally I think it's the worst method of determining anything ballistic. Turning yes, ballistics no.

To get a 12ftlb air to 20ftlb is not a great leap in velocity. I doubt it's a linear equation.

 

[Dunwaters]

I seem to remember that impact energy/air resistance increases with the square of velocity up to the speed of sound, at which stage it increases with the cube of velocity.
I think………

 

[finnbear270]

 

[bbell]

It’s a pointless unit of measurement for killing ability of firearms

 

[mealiejimmy]

Muzzle energy increases linearly with bullet weight, but squares with bullet velocity
I.e Double the bullet weight doubles the muzzle energy
Double the bullet speed and the muzzle energy increases by a factor of four
To get the muzzle energy in foot pounds where the velocity is in feet per second and the bullet weight is in grains use the following:
ftlb = (grains x fps²)/450240

Cheers

Bruce

 

[Apthorpe]

Personally I think it's the worst method of determining anything ballistic. Turning yes, ballistics no.

To get a 12ftlb air to 20ftlb is not a great leap in velocity. I doubt it's a linear equation.

Indeed it isn't. Translating energy to velocity (kinetic energy = 1/2 × mass x velocity squared.)

That has nothing to do with whether ft lbs or J is the better measure.

 

[Smellydog]

Muzzle energy increases linearly with bullet weight, but squares with bullet velocity
I.e Double the bullet weight doubles the muzzle energy
Double the bullet speed and the muzzle energy increases by a factor of four
To get the muzzle energy in foot pounds where the velocity is in feet per second and the bullet weight is in grains use the following:
ftlb = (grains x fps²)/450240

Cheers

Bruce

Correct but the effect of the energy terminally is not linear I believe, which is why I loath it's use in terms of ftlbs.

 

[Apthorpe]

Correct but the effect of the energy terminally is not linear I believe, which is why I loath it's use in terms of ftlbs.

If you used a different measure for energy, it would make no difference at all to the terminal effect.
I don't quite follow you. Firstly you didn't like the measure of energy because it didn't describe velocity and now you don't like it because it doesn't describe killing potential. To me that sounds like saying that litres is a bad measure of speed, and that it's also a bad measure of altitude. Have I missed something?

 

[mealiejimmy]

I'd tend to agree with you but testing that hypothesis is not easy

Cheers

Bruce

 

[Smellydog]

If you used a different measure for energy, it would make no difference at all to the terminal effect.
I don't quite follow you. Firstly you didn't like the measure of energy because it didn't describe velocity and now you don't like it because it doesn't describe killing potential. To me that sounds like saying that litres is a bad measure of speed, and that it's also a bad measure of altitude. Have I missed something?

Litres is a bad measure of speed...
Anyway yes, I know but I think ftlbs relates better to a turning force, not a kinetic energy using speed, mass and noise.

Maybe Joule's would be better.
No need to follow me chap, I talk crap mostly.