NASA researchers recently conducted a series of flights to record the sound of jet engines with the goal of using that data to help predict the way future engines designed for use by supersonic-capable aircraft might sound at takeoff.
The Learjet Acoustic Flight Test took place at Niagara Falls International Airport in New York, where the twin engines of a Learjet 25 owned by Calspan Corporation of Buffalo, New York, provided the sound as the aircraft was flown in various conditions.
“We chose a Learjet 25 because its engines are similar to what a future commercial supersonic aircraft could sound like,” said Brenda Henderson, NASA’s principal investigator for the flight test.
https://www.nasa.gov/feature/nasa-creating-tool-to-predict-supersonic-jet-noise-at-takeoff
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