Boston Marathon Explosion - Today's Topics: Public Schools

  • Guest, it's time once again for the massively important and exciting FoH Asshat Tournament!



    Go here and give us your nominations!
    Who's been the biggest Asshat in the last year? Give us your worst ones!
BrutulTM

BrutulTM

Good, bad, I'm the guy with the gun.
<Silver Donator>
14,771
2,656
You need an airtight lid and you need it to be strong enough that it will build enough pressure for a violent explosion when the vessel fails.

If you had high explosive like C4 or dynamite the pressure vessel would not be necessary but it is for black powder.
 
mkopec

mkopec

<Gold Donor>
26,515
40,683
Another example of this is a simple mechanical explosion of steam. Imagine a sealed metal barrel with boiling water inside of it causing the steam to expand until the entire thing explodes voilently. Now imagine the same thing inside of a plastic container. The pressure would not build up enought to cause the same explosive power because the plastic would fail before the same pressure that reached the failure rate of the metal barrel.
 
Burnem Wizfyre

Burnem Wizfyre

Log Wizard
12,574
22,149
If you have the ingenuity to make a bomb you can figure out how to rig the slow cooker to have an air tight lid, rather or not the weaker base structure allows for enough pressure I won't debate because I just don't know.
 
A

Adam12

Molten Core Raider
2,067
35
BurnemWizfyre_sl said:
If you have the ingenuity to make a bomb you can figure out how to rig the slow cooker to have an air tight lid, rather or not the weaker base structure allows for enough pressure I won't debate because I just don't know.
Click to expand...
They're still amateurs following instructions from some Osama Bin Anarchist Cookbook, though. It's for people who don't know shit, so they're going to keep the recipe as simple as possible, I'm sure.
 
mkopec

mkopec

<Gold Donor>
26,515
40,683
Pressure cookers already have an air tight lid, except for the pressure release valve. Thats the whole point of a pressure cooker. So all it would take is to seal the valve with either a weld, or solder or some other means of sealing it.
 
Burnem Wizfyre

Burnem Wizfyre

Log Wizard
12,574
22,149
mkopec_sl said:
Pressure cookers already have an air tight lid, except for the pressure release valve. Thats the whole point of a pressure cooker. So all it would take is to seal the valve with either a weld, or solder or some other means of sealing it.
Click to expand...
He was replying to me about a slow cooker that does not have an air tight lid, at least not so much that any real amount of pressure would blow the top off of.
 
D

Dabamf_sl

shitlord
1,472
0
Pretty sure I read somewhere that the pressure cooker makes a shitty bomb much better. Pressure builds up until it hits a breaking point, and the lid flies off, along with all the shrapnel, at an increased speed due to the pressure release. If it was plastic or a weaker metal, the pressure wouldn't build up as much, thus the bomb would be weaker. The pressure cooker is exactly what makes the crappy materials actually usable for a bomb.
 
mkopec

mkopec

<Gold Donor>
26,515
40,683
What I think our resident engineer is missing in his calculations is that black powder alone does not explode. It burns. What causes the explosion is containing the gasses relesed by the burning until an explosion is resched.
 
Lejina

Lejina

(╯°□°）╯︵ ┻━┻
<Bronze Donator>
4,763
12,547
What the cooker allows is for all the powder to ignite before the vessel fails. With a weaker container the powder away from the initial ignition point will get propelled away before it ignites, essentially wasting its potential energy. With a faster burning explosive you could simply stick bearings on the outside of the explosive and call it a day, but with this kind of grade of black powder, you have to account for the fact it is pretty slow burning and you have to keep the charge together long enough so it can all ignite before it gets pushed away and loses the initial shape.
 
Lejina

Lejina

(╯°□°）╯︵ ┻━┻
<Bronze Donator>
4,763
12,547
There's good odds they've got my office on speed dial already, so whatever.
 
Big Phoenix

Big Phoenix

Pronouns: zie/zhem/zer
<Gold Donor>
46,823
100,036
BrutulTM_sl said:
Actually now that I think about it I saw a guy try to make a bomb in a bottle with black powder once. It didn't explode at all, it just burned like a little torch. You need to contain the gas to build pressure to get an explosion.
Click to expand...
Because black powder isnt explosive.
 
Fuse

Fuse

Silver Knight of the Realm
500
31
Having had some time to relax and do something else for a while I realized what an intense 24 hours that was.

I just sat down and was trying to decide what to play last night and I heard about the cop getting shot at MIT, somehow found a link to the scanner (I have never listened to a scanner before). About 5 minutes after I turned it on I hear some rather intense cops saying 'definitely automatic weapon fire' and 'multiple explosions, they have grenades'. Literally slept about 2 hours and listened to this shit unfold real-time until they got white hat. Between here, the scanner and reddit, being able to experience shit as it happened was fucking awesome. The level of detail available and the accuracy of it is astounding and far beyond what cable news can provide. And I remember when cable news was some next level shit. Not that long ago shit would happen and you wouldn't know about it until some dude on a horse could get to where you are at.

The significance of this event is pretty massive too. The first major terror attack on US soil since 9/11 (I think?) The first attack by non-Arab Islamists. There were probably quite a few people that had a hard time grasping non-brown islamists. The first attack by somewhat home grown jihadis that are not directly linked (probably) to a major terror network. The first Mumbai-style 'city under siege' attack in the US (I would not be surprised to see more of these as they are cheap, hard to detect, and apparently pretty effective) and also the first time we get to see a coordinated large scale effort by what would probably best be described as our 'security forces'. I have to say, it was pretty impressive, if a bit unsettling. I was really impressed with the coordination between all the different agencies. They have come a long way since 9/11. I was also impressed with the professionalism that BPD displayed, aside from some sloppy 'open mics' especially later in the event when they were probably pretty exhausted. Quite the contrast with LAPD lighting random people the fuck up when they were after Dorner. And BPD has a Sargent Fury, which is badass. Also, their commissioner looks like Bruce Willis.

Anyway, not to get too gay on you, but I'm really glad that this community survived Donkey Gate.
 
A

a_skeleton_03

<Banned>
29,948
29,763
Do all the conservatives on your facebook feeds type like this?

Try THIS write words like this BELIEVE --- Believe ---- believe --- . TRUE BELIEVERS will SACRIFICE themselves for their BELIEF -- Believers will argue about them then "compromise" watering down the idea they PRETEND to hold to --- believers understand the ideas discussed but will not support ANY ARGUMENT --- their theme "go along and get along". The BOSTON BOMBERS were TRUE BELIEVERS --- the Policemen who DIED trying to STOP them were TRUE BELIEVERS --- they were DIAMETRICALLY OPPOSED in their BELIEF. SOME PEOPLE DIE for what they BELIEVE IN taking other WITH THEM ----- others DIE for what they BELIEVE IN saving lives.
Click to expand...
What is with the random capitalized words?
 
S

Salshun_sl

shitlord
1,003
0
a_skeleton_03_sl said:
Try THIS write words like this BELIEVE --- Believe ---- believe --- . TRUE BELIEVERS will SACRIFICE themselves for their BELIEF -- Believers will argue about them then "compromise" watering down the idea they PRETEND to hold to --- believers understand the ideas discussed but will not support ANY ARGUMENT --- their theme "go along and get along". The BOSTON BOMBERS were TRUE BELIEVERS --- the Policemen who DIED trying to STOP them were TRUE BELIEVERS --- they were DIAMETRICALLY OPPOSED in their BELIEF. SOME PEOPLE DIE for what they BELIEVE IN taking other WITH THEM ----- others DIE for what they BELIEVE IN saving lives.
Click to expand...
I think I just had a seizure.
 
Quineloe

Quineloe

Ahn'Qiraj Raider
6,978
4,464
aychamo_aycono_sl said:
I love how the 90% liberal retard population on this message board is going to ignore and excuse the fact that these two psychopaths were muslim and that this was an act of terrorism, but if this had been a beer drinking truck driver who hates American Inventors and Obama, then this would have been a clear case that all republicans are racist greedy polluters.
Click to expand...
How do you "ignore" this exactly? What do you think should come of that? Should the US bomb Dagestan next?

This time they definitely shouldn't do the usual and bomb a neighbor, as Dagestan borders to Russia (they might actually fight back) and Georgia (Chair Force might bomb Georgia, US by accident)
 
Zaphid

Zaphid

Trakanon Raider
5,862
294
Fuse_sl said:
lol, yeah the Czech ambassador thought this might be required:

http://blog.foreignpolicy.com/posts/...s_not_chechnya
Click to expand...
That was the first thing that came to my mind when they said that the suspects are from Chechnya, stop being so predictable, it's sad.

I'm just waiting for people to realize that no amount of profiling (racial, religious, political) won't save you if somebody decides to kill. It's like computer security, if something hasn't been hacked yet, it's because people weren't trying hard enough.
 
I

Itzena_sl

shitlord
4,609
6
I'm just glad they caught the fucker alive so
a) We get an actual answer as to why, and
b) he gets to spend the rest of his life rotting away in a Supermax cell rather than becoming a martyr.

rrr_img_21810.gif
 
You must log in or register to reply here.