Via Hackaday.com -
[vbrtrmn] sent in the most fun I've seen with fire lately. It's really just a geeky physics demonstration, but it's awesome. That's a foil lined pvc pipe with holes every half inch. Propane is feeding from one side and there's a 2" speaker on the opposite end. You can visit the link for the video, or just see it after the break.
Remember: PVC won't handle that sort of heat for long, and it'll emit some nasty fumes. In fact, don't try to make your own unless you can draw the propane molecule without using google.
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Pretty cool....
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