<ul><li>Electric and hybrid aircraft engines are known for their loud and high-pitched noise, caused by Boundary Layer Ingesting (BLI) technology.</li><li>Researchers from the University of Bristol and the University of Salford have identified the issue and are working on solutions to make these engines quieter.</li><li>The noise patterns, known as 'haystacking,' are a result of turbulent air disrupting sound waves inside the engine, leading to irritating noise across different frequencies.</li><li>By understanding these noise patterns, engineers are aiming to design quieter aircraft engines for a more pleasant flying experience.</li></ul>

Why do electric aircraft engines sound so annoying—and how to fix it

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