blog posts Study tests rotary blade designs in quest for quieter copters, drones May 18, 2022 11:15 am by Debra Levy LarsonInnovation Share on Facebook Tweet Email Images Researchers at Illinois are testing the limits of rotary blade design to find an efficient, but quieter option for helicopters and drones. Noise is one of the key bottlenecks for the urban air mobility market. Share on Facebook Tweet Email