naraburns nihil supernum
1yr ago
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Israel-Gaza Megathread #2
This is a refreshed megathread for any posts on the conflict between (so far, and so far as I know) Hamas and the Israeli government, as well as related geopolitics. Culture War thread rules apply.
The larger munitions (MK84s have 2000 lbs warheads) do have a certain cinematic sense to them in real-time. They're not really bright in the way movie explosions, are, though, and to the extent that there are flashes at all they're vastly outweighed by the dust kicked up. A number of videos with slow-motion cameras (MK82s have 500-pound warheads) from test fires do look more cinematic, but it's important to keep in mind that those blasts are over in tenths of a second, and at real-time unless they drop at a shallow angle you're going to catch them primarily by the dust clouds.
((I'll skip over some weirder configurations, like inert bombs or naval mines.))
The trick's that the fire and heat, barring some very specialized cases like explosions in an enclosed area or secondary explosives, are generally not the main source of damage for detonations. What kills and destroys is the pressure wave. The fire and heat is usually remnants of remaining explosive material that didn't burn off before the pressure wave overtook them.
FEMA has a good document (cw: probably will get you Put On a List) on this from a Blue Team perspective trying to reduce harm, and also what sort of buildings are more or less vulnerable to explosives. Chart 4-11 gives a (very approximate) point for where concrete columns fail. Unfortunately, it's harder to predict for buildings as a class; most modern buildings are designed to require near-complete failure of all main supports to collapse rather than merely being unsafe, but sometimes you'll find a dumb decision come in that lets sections peal off from relatively minor hits. Older US residential buildings are often more vulnerable due to the frame structure leaving the building vulnerable to hits on one or two major supports, while contrast Australia, where cinderblock and concrete everything means buildings often will stay up. I dunno Israeli architecture but I'd expect it tends to the latter side.
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Notes -
The larger munitions (MK84s have 2000 lbs warheads) do have a certain cinematic sense to them in real-time. They're not really bright in the way movie explosions, are, though, and to the extent that there are flashes at all they're vastly outweighed by the dust kicked up. A number of videos with slow-motion cameras (MK82s have 500-pound warheads) from test fires do look more cinematic, but it's important to keep in mind that those blasts are over in tenths of a second, and at real-time unless they drop at a shallow angle you're going to catch them primarily by the dust clouds.
((I'll skip over some weirder configurations, like inert bombs or naval mines.))
The trick's that the fire and heat, barring some very specialized cases like explosions in an enclosed area or secondary explosives, are generally not the main source of damage for detonations. What kills and destroys is the pressure wave. The fire and heat is usually remnants of remaining explosive material that didn't burn off before the pressure wave overtook them.
FEMA has a good document (cw: probably will get you Put On a List) on this from a Blue Team perspective trying to reduce harm, and also what sort of buildings are more or less vulnerable to explosives. Chart 4-11 gives a (very approximate) point for where concrete columns fail. Unfortunately, it's harder to predict for buildings as a class; most modern buildings are designed to require near-complete failure of all main supports to collapse rather than merely being unsafe, but sometimes you'll find a dumb decision come in that lets sections peal off from relatively minor hits. Older US residential buildings are often more vulnerable due to the frame structure leaving the building vulnerable to hits on one or two major supports, while contrast Australia, where cinderblock and concrete everything means buildings often will stay up. I dunno Israeli architecture but I'd expect it tends to the latter side.
Thank you so much for this! I’ve been around guns for a while, but never had any experience with anything explody.
So now it does make sense to me that most of the spectacle in the videos was fuel being dispersed and lit up.
By the way, Israeli and Arab architecture really is much more heavy on the cinderblocks and concrete- wood isn’t used that often at all.
Well, their area is fairly short on wood and forests.
Though Europe is also using wood on much lower scale for home construction than USA, as far as I know. Mostly for different reasons.
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