
Leonardo da Vinci’s ‘helicopter’ design could make drones quieter
Leonardo da Vinci’s sketch of the aerial screw Gianni Dagli Orti/Shutterstock A flying machine designed by Leonardo da Vinci may have been functional and much quieter than modern drone designs. Rajat Mittal at Johns Hopkins University in Maryland and his colleagues have found that da Vinci’s “aerial screw”, which he proposed while working as a…