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1/25/2018 7:38:29 AM
Posted: 4/6/2006 11:15:45 AM EST
[Last Edit: 4/6/2006 11:18:32 AM EST by TacticalStrat]
We are talking specifically about a Browning 1918 BAR 30.06 using military ball ammo.

I know the answer. First one to get it wins.
Link Posted: 4/6/2006 11:16:27 AM EST
Link Posted: 4/6/2006 11:18:24 AM EST
IIRC about 30%
Link Posted: 4/6/2006 11:18:30 AM EST
Link Posted: 4/6/2006 11:19:25 AM EST
w00t 6 seconds
Link Posted: 4/6/2006 11:20:43 AM EST

Originally Posted By Magurgle:
w00t 6 seconds

Link Posted: 4/6/2006 11:21:29 AM EST

Originally Posted By Magurgle:
IIRC about 30%

DING-DING-DING!! That's close enough. 29% is the correct answer.

NEXT QUESTION (FILL IN THE BLANK) : A pound of single-base rifle powder has an energy content of about _____________ FT LBS of energy.
Link Posted: 4/6/2006 11:21:37 AM EST
sorry, I thought it was funny, it was a friendly w00t
Link Posted: 4/6/2006 11:23:23 AM EST

Originally Posted By Magurgle:
sorry, I thought it was funny, it was a friendly w00t

no prob, I was just guessing, 30% is usually the answer to energy efficiency type questions
Link Posted: 4/6/2006 11:24:13 AM EST
Kind of like picking C on a multiple choice question
Link Posted: 4/6/2006 11:24:24 AM EST
First find the energy of the bullet. E=1/2MV^2
Second, find the energy stored in the powder and primer based on its mass and stored chemical energy

More data about muzzle velocity, powder type, ect is necessary to get a numerical result.

Now, just set up a ratio of E(bullet)/E(propellent).
Link Posted: 4/6/2006 11:24:35 AM EST

Originally Posted By TheRedHorseman:

Link Posted: 4/6/2006 11:27:39 AM EST
I assume this is calculated by knowing the heats of formation of the reactants and products, assuming total powder combustion, calculating the theoretical maximum energy, and dividing that number by the kinetic energy of the bullet?
Link Posted: 4/6/2006 12:28:42 PM EST
[Last Edit: 4/6/2006 12:30:49 PM EST by Rickyj]
18% Foot pounds a pound.
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