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Haven't you ever been cheering on a sports game with your measly
little airhorn and wish it had just a little more oomf? Or been using
your flamethrower to clear out hornet's nests and wanted the
whole neighbourhood to know? Walking back from the outhouse
and run into a groggy grizzly? No? No
one else?
Well anyways, as everyone knows, a can of aerosol and a lighter
make a fantastic improvised flamethrower, and that's basically
what an airhorn is anyways. Put some butane in there and slap an
old bbq lighter on there and you've basically got it! And hey maybe
some pepper spray too, just in case I see that bear again.
Rijke Tube
https://en.wikipedia.org/wiki/Rijke_tube
A tube with a flame up it works like a flute (sort of...).
I've seen a musical instrument that uses a series of them. [neutrinos_shadow, May 03 2022]
Another Rijke tube like Neut ws talking about
https://www.youtube...watch?v=pncG3lJUOdY
[doctorremulac3, May 03 2022]
Is fire plasma web search results.
https://www.google....AEB&sclient=gws-wiz
Interesting stuff. [doctorremulac3, May 04 2022]
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Annotation:
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Whoa! This is amazing! [+] |
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Pepper spray is good too. Has anybody made a pepperspray
that just sounds an alarm when you spray it? That might be
cool. |
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Or a pepper spray that sounds exactly like the anguished screams of the
recipient. |
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And there was much rejoicing.... [+] |
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+ Yes and [a1]’s links just show how cool it is! |
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Sometimes an idea is so cool anybody who thought of it should
get credit. I'd bun this twice if I could. |
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I would bun this idea if someone posted it repeatedly every day. |
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How to make it better? Built in igniter as suggested by [mace]. Also presumably a spun aluminium horn so the horn itself doesn't melt or catch fire. And should there be something like a gauze over the mouth of the horn, so that the flame front is better controlled for more spectacular flaming and clearer sound production? |
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I'm suddenly curious as to the behavior of a sound wave inside
a flame. |
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The flame is matter pulsing in waves just like air
but in a different state. Not state, mode, what's
the word I'm looking for? It's on fire. |
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What's the difference between something that's on
fire and something that's not? State would be solid
liquid or gas, I guess fire is just a mode of a
gaseous state? |
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This is where 8th of 7 would roll his eyes and
basically say "Hey stupid, it's _______". |
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Anyway, it would behave the same as gas that
wasn't on fire, you'd be able to see clear pulse
waves. Then when the fuel is burned the force
from the sound generating diaphragm would
continue on, like pouring gas on the waves of a
beach and lighting it in fire. It would follow the
waves then burn out, but the force that caused the
wave would still be evident in the remaining fluid. |
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Yeah, but I just want to see what it would look like. |
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The flame itself can produce the sound. See linky. |
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//"Hey stupid, it's _______"// |
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"Plasma" is the word you're looking for. Yes, that word has a
different meaning in medicine, but in physics, it's the next
state of matter above gas. My understanding (and I am not
a physicist) is that flames and lightning bolts are made of
plasma. |
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[8th] would then offer to demonstrate the use of plasma
such
that any survivors near the target area might need plasma, if
they got to hospital in time. He would shake his head at the
notion of any survivors *in* the target area. |
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Well done pert, I think 8th would say "We approve".
Together I think we can put together a reasonable
analog of our old buddy for purposes of annotations. |
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See link for the whole fire/plasma thing. Interesting
stuff. |
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Hey, [doc3], it's - well, actually it isn't, because you're not
proposing supersonic flow, but if you were, it would be easy
to see the pressure waves molding the flame form, which
then would be - Mach diamonds. (q.G.) In air, a flame is a
pretty short duration phenomenon, unless you're continuously
feeding it fuel; if your flambeau-boe is tuning the orchestra
to an A-440, the wavelength will be about 80 centimeters-
ish, and you're going to need to move the fuel pretty
sprightly to get it over that distance before it goes out. I'm
thinking that you either would have to have supersonic flow,
or feed the fuel transverse to the wave fronts. |
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Yea, I was reading some of the posts in the search
link that was getting into the details. Plasma it turns
out is some pretty interesting stuff. |
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(pauses... wait... does plasma qualify as "stuff"?) |
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Flames are inefficient. They're what happens when the molecules have enough time to settle down and pair up. Real plasma keeps things too exciting for fire to happen. |
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//Flames are inefficient.// |
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Not if flames are the object of the exercise. |
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//Real plasma keeps things too exciting for fire to happen// |
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Something of a challenge to maintain plasma energies in
the open air with a handheld device. But, if successful, I
think you're into a juicy military contract. |
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//I think 8th would say "We approve"// |
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Heh. Or he might have gone the other way. "Isn't this just a
tiny flame thrower with added noise? Aren't the screams of
the partially immolated the traditional soundscape associated
with flame throwers?" |
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As for the idea [+], obviously. It should be possible to put
together a prototype with an air-horn and a blow torch
canister. Some safety gear recommended. |
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//maintain plasma energies in the open air//
Precisely what my recent ShockWave idea tries to do! |
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"...so they shall hear and fear." |
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Originally: "Lemmaan yiroo we yiraoo" (so they shall see and
flee) |
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