Mexican teen wins gold with speaker that kills flames in 5 seconds — an idea DARPA abandoned in 2012
aakashgupta · x · 2026-10-27
A Mexican high school student won a gold medal for a fire-extinguishing device that uses sound instead of water or chemicals: a speaker plays a deep 30Hz hum and flames die in about 5 seconds, all running off a 12-volt battery in a portable rig.
The physics: flames exist only in a thin layer where fuel vapor mixes with oxygen. A 30Hz note flips the surrounding air direction 30 times per second, stretching that layer thinner and pulling heat away faster than the flame can regenerate, until the flame detaches and the torn-off portion is too cool to keep burning.
DARPA tried the same concept in 2012 but abandoned it due to a bulky rig. Its report estimated the air at the flame needs to move only about half a Mach — a threshold this portable student build apparently clears.
Related event: Mexican Teen Wins Gold With Sound-Wave Fire Extinguisher(2 posts)→
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