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There's quite a bit of info already on here about them, which can be found using the search facility (magnifying glass, top right).Does anyone have a view on these - just came across them online...
My intent was to do the experiment in a controlled envirorment. A place where a bystandard or other external factors couldn't interfere with the results. I figured that if a blade made more noise than the other, even if it's inside a concrete structure, the decibel meter would pick up a difference in db level, even if it's under a box effect. If blade A is louder, when the sound rebounds the walls, it will still be louder.Good experiment, especially using a sound level meter. Perhaps a more accurate way to measure would be outdoors at 10 feet AGL, under real flight conditions on a still day? Indoors, with the drones sitting on a table, you have lots of acoustics to deal with. It's outdoors that count when nearby people might take notice.