622Views60Replies

Author Options:

Has anyone ever done this? Will this make a massive explosion, or is there a gap? Answered

Picture of

Okay, so I have decided not to do this,but I'm just curious if anyone has done somthing simmilar to this? The design is very,very,VERY, simple,basically it is just two oxygen cylinders and two MAPP cylinders bound together with duct tape. There is an explosive device in the center (C4 or a steel pipe with blackpowder?). When the explosive device goes off, its force raptures each of the cylinders. The MAPP(fuel source, duh!) mixes with oxygen(oxidiser obviously) and heat (from the explosive device) to create one massive explosion. I'm not really going to do this, but just curious about what would happen if I did. Would it work, or is there a fault in this design? BTW- If you did or are going to try this out, please, post a video. Oh yea, and do it in the middle of nowhere where no one could get hurt,and make sure you are safe as well.

50 Replies

user
themattar (author)2009-01-16

Fuel air type explosives are too iffy for small scale fun, if there is too much wind,or if there are thermal updrafts or the ignition "mechanism" fails to ignite at the right time .you wont get a right fuel air mix and you will get a half-assed deflagration rather than a kiff explosion Check out thermobaric explosives it is a simple mixture consisting of 20- 40%powdered aluminum and any brissant high explosive (VOD in excess of 5km/s) it is preferable for the high explosive to have a high oxygen balance,so more aluminum gets burnt during detonation what happens is :....when the explosive is detonated you have the initial small blast which is the HE detonating .a few percent of the Al burns creating a lot of heat (white heat +1700 C),and additional pressure ,this sprays the superheated Al in excess of 3km/s.seeing as the aluminum is white hot it reacts with the air ,resulting in nearly all the Al being burnt simultaneously creating a secondary high pressure front (blast)

Select as Best AnswerUndo Best Answer

user
skunkbait (author)2008-09-13

I'm with Barefoot. I think it would need a high explosive to set it off. I'd set a low explosive charge to set off a larger high explosive charge, and I'd try to figure out the weakest point of the compressed bottles to make sure they took the brunt of the charge. I'd plant the whole thing in the ground in an old water heater or something. I've considered doing something like this to dig my pond deeper, but I don't want any frags to make it up to the house or car 150 yards away!

Select as Best AnswerUndo Best Answer

user
Rishnai (author)2008-09-13

Assuming I had access to a bomb range and the inclimation to actually build and test this, I would want to put some sort of frag or grapeshot in the explosive cylinder. Heck, I'd just use a claymore if I had the chance. This seems more likely to put holes in the oxy and mapp cylinders before things go flying too far for the gases to mix.

Select as Best AnswerUndo Best Answer

user
BarefootRandom (author)2008-09-13

This would probably work with a high explosive charge to set it off. A steel tube full of Gunpowder would perhaps just blast the gas cylinders clear of the explosion. If a secure steel container was used to house both the cylinders and the Gunpowder charge, then it would perhaps work. But doing this type of thing is bordering on the insane and not to be recommended.

Select as Best AnswerUndo Best Answer

user
KentsOkay (author)2007-06-10

I have actually done something very similar, I have it in a forum topic Fireball Bomb That Works Like An A Bomb. You don't need an oxygen source (provided it's not underwater), just a reliable form of ignition and a way to release the gas.

Select as Best AnswerUndo Best Answer

user
themasterpyro (author)KentsOkay2007-11-05

i never did anything like that but today i made a bomb out of an empty olive tin with lid, hot glue, duct tape(which ironically is utterly useless on ducts), string, plaster of paris(not much, about 1/2 inch), fine black powder(only explosive in the whole thing), and fuse. when i set it off with my friend we put it in a small hole with a slab of wood about 3/4 inches thick over the hole and weighted the wood with a large chunk of granite(about the size of my shoulder) and 1/2 a fire brick(seems i dont have any wholes in all my 10 acres) when it went off we were standing about 15 ft away(yes i know im haphazard) and we both felt a shockwave and our ears were ringing a bit too. when we looked we saw it cracked the wood and threw the weights(not too far, about 2-3 ft), made the hole a bit bigger, and threw shrapnel about 5 inches into the ground(this is hardish clay type. not soft loam like most of you know)

Select as Best AnswerUndo Best Answer

user

I once detonated 12 pounds of ANNM. Sooooooo friggin loud! Twigs and leaves fell, I felt the shock wave hit my face, dust started billowing from the ground. (It took me a while to realize I was not hearing anything after the explosion, all I was hearing was a ring It probably one of the most devastating explosions I've ever created.

Select as Best AnswerUndo Best Answer

user

ANNM? not a clue, what is it???and do you know any links where i can get some nitric acid?

Select as Best AnswerUndo Best Answer

user

ANNM- Ammonuim Nitrate with Nitromethane.It's a type of ANFO plastic explosive (ammonuim nitrate fuel oil). However, you do need a blasting cap to detonate it. (I used a homemade blasting cap mafe from HMDT or Hexamethylene triperoxide diamine. ANNM is infamous due to it's involvement in the Oklahoma City Bombing. I have no idea where you can purchase nitric acid online, but I have been able to make nitric acid from Potassium nitrate and sulfuric acid(from car batteries)which I concentrated. I've also been able to "borrow" some nitric acid from chemistry class.

Select as Best AnswerUndo Best Answer

user

DUDE WTF ARE YOU DOING WITH WITH EXPLOSIVES LIKE THAT IN SUCH HUGE QUANTITIES???!?!??!!? whered you get it???

Select as Best AnswerUndo Best Answer

user
I was able to obtain Ammonuim Nitrate from buying a bunch of those (instant cold packs) from target and cured them. I was also able to buy a massive load of ammounium nitrate from ebay. If I recall correctly,I was able to purchase 30 pounds of ammonium nitrate from ebay for forty something dollars, but the shipping and handling costed a lot. I think it was around 17 dollars. I was able to obtain several gallons of nitromethane at a car show.

If you think 12 pounds of ANNM is a lot, there's this other dude (Though he got arrested) who setted off 12KG!!! Thats around 26 pounds! Twice the ammount I've ever detonated. His nickname was "Redsky".
Here is one of "Redsky's" video.
Video
can not parse options from: width="425" height="355"><param name="movie" value="http://www.youtube.com/v/Rsg76QjDTiE&rel=1"></param><param name="wmode" value="transparent"></param><embed src="http://www.youtube.com/v/Rsg76QjDTiE&rel=1" type="application/x-shockwave-flash" wmode="transparent" width="425" height="355"></embed></object>, {width:425, height:350}

Select as Best AnswerUndo Best Answer

user

howd you cure it? oh and it wont show the video

Select as Best AnswerUndo Best Answer

user

isnt his nickname redbody from all the blood

Select as Best AnswerUndo Best Answer

user

DANG IT!!! The video is not showing up!

Here is a link to Redsky's video.....

http://www.youtube.com/watch?v=Rsg76QjDTiE

Select as Best AnswerUndo Best Answer

user

I mean "(It took me a while to realize I was not hearing anything after the explosion, all I was hearing was a "ring") It was probably one of the most devastating explosions I've ever created." I still can't believe I did that! It felt so surreal, like I was dreaming!

Select as Best AnswerUndo Best Answer

user
KentsOkay (author)themasterpyro2007-11-06

Most impressive, how did you manage not to frighten the neighbors?

Select as Best AnswerUndo Best Answer

user
themasterpyro (author)KentsOkay2007-11-06

they were 2 acres away so it wasnt too loud to them.

Select as Best AnswerUndo Best Answer

user
themasterpyro (author)KentsOkay2007-11-07

i guess. can you list all the delay compositions you know with quantities? from commercial firework to military application.

Select as Best AnswerUndo Best Answer

user
KentsOkay (author)themasterpyro2007-11-08

Ummm, I'ma RocketScientist, not a Master pyro!

Select as Best AnswerUndo Best Answer

user
themasterpyro (author)KentsOkay2007-11-08

ah thx anyway. know any links?

Select as Best AnswerUndo Best Answer

user

Did it just make a nice pretty fireball or was there a good blast wave as well?

Select as Best AnswerUndo Best Answer

user

I filled the lid of a butane refill can with black powder and gave it 10inches of fuse. Lit fuse and RAN. There was a pop (the black powder), it burned through the nozzle, realeseing all the gas and made a 10-15 foot tower of flame with a big (it went BOOMMWHUMPH!). I wasn't close enough for a concussion (I was about fifty feet away), but I'm sure there was one.

Select as Best AnswerUndo Best Answer

user
frank26080115 (author)NachoMahma2007-06-09

i removed that comment because i was being an idiot

Select as Best AnswerUndo Best Answer

user
NachoMahma (author)frank260801152007-06-10

. Not at all. I thought it was very appropriate. And extremely funny.

Select as Best AnswerUndo Best Answer

user

not all terrorists use bombs some make flashing led boards

Select as Best AnswerUndo Best Answer

user

That's funny, if a little close to home.

Select as Best AnswerUndo Best Answer

user
Sedgewick17 (author)2007-11-06

Yea, I have done this, but only with latex balloons, but even if you are only using balloons it is extremely loud and powerfull.If you mix the right proportions you can break windows by the shock wave.

Select as Best AnswerUndo Best Answer

user

I did the same thing but I used smaller water ballons. I've underestimated it's power. I did it in the bathroom in the kitchen sink, I was probably only 1 and a half feet away from the ballon. I ignited it with a burning stick. It just went "boom", I felt the shock wave hit my chest and an orange/yellow/red spot was stuck in my sight because of the very bright (yet very instant) flash of light from the exploding ballon.It did not shatter my windows, but I'm just glad I did not make it any bigger. Oh yea, the ballon was not even full, it was just about 1/4th full.

Select as Best AnswerUndo Best Answer

user

I filled it ALL THE WAY UP,but I did it outside where it was still very loud.You did this inside?That must have been nuts! I also shoot at oxy mapp gas ballons with tracers (very fun excpecially at night)

Select as Best AnswerUndo Best Answer

user
lemonie (author)2007-06-09

What is MAPP? There is a real possibility that the C4 charge will just scatter you cylinders. L

Select as Best AnswerUndo Best Answer

user

Hmm, I only just noticed that the C4 is supposed to rapture the cylinders, but you're an atheist?
OK it might rupture them, but you'd expect them to be flung away from each other, scattering fuel and oxygen?

L

Select as Best AnswerUndo Best Answer

user

Hmmmm... What if I bind them together with a metal strip or hose clips instead of duct tape? How about a molotov cocktail attached to the C4 or pipe to ensure that the two gasses will combust?

Select as Best AnswerUndo Best Answer

user

Why not just release the MAPP in an enclosed space (large marquee, barn etc) and leave an old bell-ringing phone in the same place?

Go a long way away, then call the phone.

Select as Best AnswerUndo Best Answer

user

If I had a chunk of C4, I definetly wouldn't be wasting it on gas tanks. C4 would blow them to smithereens, all you would need to do is to put some thermite on the nozzle of the MAPP bottle.

Select as Best AnswerUndo Best Answer

user

(I really hope this is just a thought excercise)
You would need all cylinders to rupture simultaniously, and I guess the right charge would do this. How about shaped cutting charges?
e.g. http://www.dynawell.de/explosives_lsc.html

L

Select as Best AnswerUndo Best Answer

user

Oh yea, that would work best!

Select as Best AnswerUndo Best Answer

user
NachoMahma (author)lemonie2007-06-09

. Similar to acetylene, but much easier to handle (doesn't require special bottles). Also much less shock sensitive.

Select as Best AnswerUndo Best Answer

user
trebuchet03 (author)2007-06-10

We have a "be nice" comment policy. Please be positive and constructive with your comments or risk being banned from our site.

Select as Best AnswerUndo Best Answer

user
KentsOkay (author)trebuchet032007-06-10

What did he say? We oughta ban him anway though, he hasn't been very pleasent.

Select as Best AnswerUndo Best Answer

user
trebuchet03 (author)KentsOkay2007-06-10

A disparaging pejorative.

Select as Best AnswerUndo Best Answer

user
lemonie (author)KentsOkay2007-06-10

He doesn't make the most intelligent contributions to this site. The comment was removed because it was inappropriate, and as such it would defeat the object of removing it for me to post it again here. However, the reply by IlluminatedAntichrist Jun 9 (below) should give you a pretty good idea.

L

Select as Best AnswerUndo Best Answer

user

What about a black powder, or smokeless powder 1/2" by 6" galvanized steel pipe bomb with a molotov to ensure that there will be fire to ignite the gasses? Perhaps the shrapnel will peirce the cylinders? Yes, I know they are dangerous, lethal, and very,very, illigal, but I'm just doing this in my mind,I'm not going to kill anyone or anything.

Select as Best AnswerUndo Best Answer

user

Did you read my other comment?

Select as Best AnswerUndo Best Answer

user

Ah, sorry, I didn't see that the first time, I forgot to click "view all".

Select as Best AnswerUndo Best Answer