Common electric powered drones don't emit any heat, they aren't jet powered or internal combustion engine. Also they receive RC signals to navigate, they don't need to emit unless streaming video footage.
This isn't true. Anything that utilizes mechanical motion generates heat. This is physics 101.
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A small plastic propeller is creating a miniscule amount of heat, undetectable with common FLIR sensors, especially when diffused into atmosphere with wind and turbulence.
