Polaris
Penultimate Amazing
- Joined
- Apr 8, 2006
- Messages
- 11,396
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However, I can't actually find information on how fast shrapnel moves so if you would like to cite some evidence, I would be interested to know if what I said was really wrong.
I did some searching and (frustratingly) found that most of the working sites for anything related to bomb shrapnel and blast velocity had to do with nukes. Of the others, the speed of shrapnel I saw listed was so varying that I'm not sure what to make of it (100fps to 30,000fps), and a lot sounded like speculation for political reasons ("the eeeeeeeevil Israelis use cluster bombs with deadly high-velocity shrapnel going a million miles per hour" kind of stuff) I did find this page though, which lists a formula for determining velocity of detonation (VOD) when the quantity of explosive in a blast is unknown. It lists probable VOD for most of the major bombings in the last 30 years.
http://www.usdoj.gov/oig/special/9704b/5willms.htm
This page (http://www.globalsecurity.org/military/systems/munitions/explosives-compositions.htm) lists the VOD for military explosive compounds. Composition B (WW2 TNT) is 24,000 fps. Under the list is the "slurry" category, which for our purposes sounds very like what would be found in homemade bombs. These have a VOD of 2,000-18,000 fps. Average that out to 9,000fps and you have velocities at least triple most rifle rounds.
Considering that a 5.56mm rifle round (used in all NATO rifles) and a 7.62x39mm rifle round (AK-47 rifle) have muzzle velocities of 3300fps and 2330fps (http://www.militaryfactory.com/ballistics_tables.asp), that puts the muzzle velocity of the most powerful reasonably common civilian firearms at the lowest end of the spectrum of bomb blasts. That might change a little if a .50BMG caliber rifle is ever used in a crime, but for now it's academic.
Of course, these numbers are for velocity of detonation, not velocity of explosion, but since most victims of bomb blasts are near the detonation, I don't think the distinction matters that much. Shrapnel nearer the blast I think it's safe to assume will be travelling at or very near the speed of detonation before losing velocity to gravity, etc.
Now I'm going to let this derail die. I'm not that concerned with it - I just got the impression you were telling me what I could say, or else. That puts me into orbit. Btw, a sunken chest would be great. Try as I might, I can't get rid of my adolescent man-boobs.