Oscar Propulsion Limited and the University of Strathclyde have developed a propeller technology capable of reducing underwater radiated noise (URN) generated by ship propellers.
PressurePores system aims to reduce propeller tip vortex cavitation by applying a small number of strategically placed holes in the propeller blades. The addition of these pressure-relieving holes allows ships to operate with a more silent propeller, according to a statement.
In fact, this system took four years of...
https://container-news.com/new-propeller-technology-to-reduce-underwater-radiated-noise/