NLR Measures Engine Noise in Flight Netherlands aerospace laboratory NLR has tested a method to measure aircraft engine noise in flight, in support of development on fuel-efficient open-rotor engines under Europe’s Clean Sky 2 aeronautics research program. Engine noise is usually measured during ground runs or from the ground in flyover tests. But the unshrouded propellers of open-rotor engines have different noise characteristics than conventional turbofans, where the fan is within ...


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