DMF38

December 10, 2006, 10:39 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, 10:39 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?

If you enjoyed reading about "Calculating Foot Pounds" here in TheHighRoad.org archive, you'll LOVE our community. Come join TheHighRoad.org today for the full version!

The Bushmaster

December 10, 2006, 10:46 PM

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

Sylvan-Forge

December 10, 2006, 10:46 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 10, 2006, 11:08 PM

Thanks for the help! :)

Clark

December 10, 2006, 11:31 PM

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, 04:32 PM

Go here:

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

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

If you enjoyed reading about "Calculating Foot Pounds" here in TheHighRoad.org archive, you'll LOVE our community. Come join TheHighRoad.org today for the full version!

vBulletin® v3.8.6, Copyright ©2000-2014, Jelsoft Enterprises Ltd.