![PDF] Experimental investigation of contra-rotating multi-rotor UAV propeller noise | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/d97c708805001e1a6052cdd1f486fff0b3261c71/2-Figure1-1.png "PDF] Experimental investigation of contra-rotating multi-rotor UAV propeller noise | Semantic Scholar")
PDF] Experimental investigation of contra-rotating multi-rotor UAV propeller noise | Semantic Scholar
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