Good News Notes: “Beta Technologies, an electric aircraft startup working with UPS and backed by Amazon AMZN -14%, said it raised a further $375 million to prepare to build a fleet of cargo-delivery copters and the charging network they’ll need to keep them powered up. The South Burlington, Vermont-based company said the Series B round was led…
Tag: quieter
Owl Wing Design With Serrated Edges Reduces Aircraft, Wind Turbine Noise Pollution
Good News Notes: “Trailing-edge noise is the dominant source of sound from aeronautical and turbine engines like those in airplanes, drones, and wind turbines. Suppressing this noise pollution is a major environmental goal for some urban areas. In Physics of Fluids, by AIP Publishing, researchers from Xi’an Jiaotong University used the characteristics of owl wings to inform…