DMF38

December 10, 2006, 11:39 PM

Does anyone know how to calculate foot pounds of energy? Suppose I'm shooting a 250 grain bullet from .45 Colt, and the measured velocity is 800 fps -- how would I determine the foot pounds of energy produced?

DMF38

December 10, 2006, 11:39 PM

Does anyone know how to calculate foot pounds of energy? Suppose I'm shooting a 250 grain bullet from .45 Colt, and the measured velocity is 800 fps -- how would I determine the foot pounds of energy produced?

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The Bushmaster

December 10, 2006, 11:46 PM

Bullet weight in grains X velocity squared divided by 450400 = ft lbs

Sylvan-Forge

December 10, 2006, 11:46 PM

bullet weight in grains x velocity squared

divided by 450400 = ft-lbs

edit: lol, The Bushmaster beat me to it

divided by 450400 = ft-lbs

edit: lol, The Bushmaster beat me to it

DMF38

December 11, 2006, 12:08 AM

Thanks for the help! :)

Clark

December 11, 2006, 12:31 AM

As every school boy knows, energy is equal to one half mass times velocity squared.

The trouble is, guns are in the wrong units.

Energy = .5mVV= one half mass velocity squared

E = .5 [250 grains] [800 fps] 800 fps]

E= .5 [250/7000 pounds] [800 fps] 800 fps]

E = .5 [.0357 pounds] [800 fps] 800 fps]

Mass = [wieght]/gravity= .0357 /32.2 feet per second squared = .001109 slugs of mass

Es=.5[.001109 slugs][800 fps] 800 fps]= 355 foot pounds of energy

Or you can just multiply grains times velocity times velocity divided by 45 and move the decimal place to what seems right.

3555555.556

Is a pistol 35, 355, or 3555 foot pounds?

It must be 355 foot pounds.

It does not matter, as Nicole Simpson took 5 foot pounds to the throat and dropped.

The trouble is, guns are in the wrong units.

Energy = .5mVV= one half mass velocity squared

E = .5 [250 grains] [800 fps] 800 fps]

E= .5 [250/7000 pounds] [800 fps] 800 fps]

E = .5 [.0357 pounds] [800 fps] 800 fps]

Mass = [wieght]/gravity= .0357 /32.2 feet per second squared = .001109 slugs of mass

Es=.5[.001109 slugs][800 fps] 800 fps]= 355 foot pounds of energy

Or you can just multiply grains times velocity times velocity divided by 45 and move the decimal place to what seems right.

3555555.556

Is a pistol 35, 355, or 3555 foot pounds?

It must be 355 foot pounds.

It does not matter, as Nicole Simpson took 5 foot pounds to the throat and dropped.

Jay29

December 11, 2006, 05:32 PM

Go here:

http://www.handloads.com/calc/quick.asp

http://www.handloads.com/calc/quick.asp

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