We’re not really sure what the heck this thing is, but it has a really neat flame vortex that forms… is the fire making that noise? is the noise being produced by a speaker to drive the fire into oscillation? We thought it was neat though. You can see a doughnut shaped vortex fire ring form around the back edge of the device, and seem to change shape and size depending on the tone. www.PulseJetEngines.com
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