h a l f b a k e r yCeci n'est pas une idée.
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Easier just to throw one of those 15kg Butane gas bottles on a big fire, old housemate told me the local bikers did that once, none of them could hear 3 days afterwards mind you.. |
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It'd be easy to put some magnesium powder into the balloons
before inflating too. [+] |
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Much, much bigger bang if you use hydrogen+oxygen,
or even hydrogen with air. |
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This was something I wanted to do when I was about eight. |
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//Much, much bigger bang if you use hydrogen+oxygen, or even hydrogen with air.// |
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These have the additional 'advantage' of not having the same lift, so the bang is close enough to really feel the benefit. |
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(Note: hydrogen+oxygen is significantly bigger bang than hydrogen+air; some caution may be advised.) |
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Caution, smaution. Guy in welding school filled a bread bag with acetylene gas and tossed it onto the flame cutter, the explosion brought down dust from the roof beams 15 metres about, and the wrath of the overseer. How we laughed. |
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If you want to see total masculine insanity + flammable gases + sledge hammers + grinding wheels + large hydraulic guillotines, I can definitely recommend welding school. |
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Told the story before, but my episode of "Greatest
Childhood Explosions" featured 1) laying out a big line
of gunpowder about ten yards long with a big pile at
the end that was supposed to burn like it did in the
cartoons, slowly like a fuse, (it doesn't) 2) putting a
bunch of
primers at the bottom of a jar, powder on top and
THIS TIME a fuse of sorts, a layer of flammable glue
on top to allow us time to run to a safe(er) distance.
3)
and of course the m-80 in the milk carton that turned
the carton, and almost my hand, into a beautiful
flower looking modern art sculpture. |
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Ahh, to be young, stupid and reasonably well
equipped with explosive materials. |
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//throw one of those 15kg Butane gas bottles on a big fire // |
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Bad idea. Place the bottle and then build a bonfire round it - that way,
there is some (mostly illusory) control of the direction of the flame. |
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// none of them could hear 3 days afterwards mind you.. // |
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Depends on the failure mode. Sometimes there's just a jet of flame
from the top of the bottle; more rarely, the true BLEVE, which scatters
the fire over a huge area and has to be seen to be believed. |
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Don't rely on sandbags for protection; a ditch or trench is essential. If
the tank bursts, lumps of hot metal go whirring in random directions
at great speed. |
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As to the idea, [MB] is correct. Hydrogen will just burn, with relatively
little flame; introducing a proportion of oxygen, even if the mixture
isn't stoic, will give a much more satisfactory result. |
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I think you get your mixture from the hydrogen under
pressure expanding when the balloon pops and mixing
with your surrounding oxygen in time to get all the
ingredients for explosive goodness. |
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Ignition propagates from the point at which the balloon is penetrated
by the flame. There's turbulence as a jet of hydrogen is emitted, but
the mix isn't stoic, so it burns instead of exploding. As the rubber pulls
away, the hydrogen continues to burn at the gas/air interface. |
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//but the mix isn't stoic// |
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That's very difficult to prove. It's almost impossible
to determine the state of mind of the hydrogen
either before or during the combustion. It may be
resigned to its fate, but we're unlikely to know for
sure. |
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However, we can be fairly certain that the mix is not
stoichiometric. |
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I wasn't going to say anything. |
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Eighth, Eighth... You're forgetting that we coat our balloons
in thermite. |
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If you painted a spiral of explosive material on a long
sausage shaped balloon and lit it it would ignite in a
spiral fashion and form sort of a corkscrew of flame. |
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At school the students (boys only) would take apart the
giant screws from the bomb shelters, put some match
heads inside between two screws, and then simply
throw it high enough and far enough. |
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When it falls, it explodes loudly and propels the parts
way up. One hit the third floor next to our classroom,
and took a big chunk off the wall, next to the class's
"good boy" who stayed in the classroom and was
watching carefully from the window. |
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Some years ago, we were at the entrance to a 'youth
village', waiting for a group of kids to reach the gate,
after a "sea to sea" 3 day cross of Israel through the
Carmel mountains. all of a sudden one of the giant flag
poles fell to the side. All the large screws were screwed
off and missing, presumably for the exact same reason
as above. Whoever did it, never thought that the flag
poles would actually fall. Luckily no one was hurt. |
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Dammit MB, I was just going say that... |
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It could be stoichioImperial, we don't know if hydrogen has gotten around to Metric yet...might still be on £.s.d for all I know |
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/mental state of hydrogen/ |
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I would think more epicurean than stoic, given its penchant for mixing it up with other atoms. |
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/bag of acetylene/
I recall mathing this out and judging that acetylene should be buoyant. So disappointing to find video of such a bag, very unbuoyant. I think there may even be video linked somewhere on the HB if the idea still exists. |
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..found it linked under one of my ideas but no movie at link. |
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