Quote:
Originally Posted by modest
A typical .45 has a diameter of ~104mm.
|
Quote:
Originally Posted by CraigD
Quote:
Originally Posted by modest
A typical .45 has a diameter of ~10[.]4mm.
|
|
Yes. It seems my posts of late are mostly, but not entirely, unlike something legible.
A .45 indeed has not a
diameter of 104 mm, but a
rear surface area of 104 mm
2 which might then make apparent why I'd multiply that by 0.01033 kg/mm
2 to give ~1 kg or ~9.8 Newtons.
Quote:
Originally Posted by CraigD
You might be right, modest. Though I never measured it directly, I’ve reloaded thousands of cartridges of various rifle and pistol types, and on a few occasions had to pull the bullets from a batch of crimped cartridges after making a mistake in the powder load or bullet. I had a handy little tool for this, a kind of complicated pliers, so never directly pulled on a bullet, but would guess the force needed to be in the 2 to 10 N (1 kgf, 2 lb.) range.
|
Excellent. It didn't even occur to me that someone loading their own cartridges would occasionally have to pull one that set bad. That's excellent confirmation.
Quote:
Originally Posted by CraigD
1 atmosphere = 101325 N/m 2, so the force exerted by this pressure on a 0.009 m (9 mm) diameter bullet is  , which might be enough to pop the bullet out of its case. |
Yes. Agreed. My only question...
Quote:
Originally Posted by CraigD
The change in pressure would need to be fairly sudden, though
|
I intuitively think you're right, but logically have not convinced myself of it. In my experience, the best way to remove a cork from a wine bottle is with a slow and steady force. An equal force which is quick and fleeting doesn't seem to accomplish as much.
In other words...
While watching that youtube video I considered that the bullet probably had a mass around 30 grams (a complete guess, I have no clue) and the hammer maybe accomplished 20 gees giving a force somewhere in a very large vicinity of .6 x 10 = 6 Newtons. I didn't think to consider that the force was a jerking one. Should that matter? Does going from 0 to 6 Newtons in an instant accomplish more in the way of bending metal or overcoming static friction than building up to 6 Newtons slowly and sustaining it?
Quote:
Originally Posted by CraigD
, and the cartridge not in a magazine that would prevent the bullet from expanding much – though all the cartridges in a mag lock themselves in it with more force than the mag’s spring could overcome could be as dramatic a problem for our space-pirates as contending with a mess of lose bullet and powder.  |
Either way the results could be hilarious
Dirty Harry: I know what you're thinking. "Did he fire six shots or only five?" Well, to tell you the truth, in all this excitement I kind of lost track myself. But, being as this is a .44 Magnum, the most powerful handgun this side of the solar system, and would blow your head clean off, you've got to ask yourself one question: Do "I feel lucky?" Well, do ya, punk?
Criminal: I was actually thinking "Did he fire five shorts or only four" because it looks like the sixth has popped clean out of your revolver and is now floating over that way...
~modest
