The propellers of the world's ships and boats create a constant drone that disrupts ocean life. New propeller designs based on loops could one day quiet that drone and be more fuel efficient. Sharrow ...

Hydrex diver positioning the blade cutting tool over the propeller blade. © Hydrex Severely bent propeller blade of container ship in Congo. © Hydrex In December ...

Imagery released today by Northrop Grumman provides a close up view of one of the two rear propellers of the Manta Ray UUV (uncrewed underwater vehicle). Just a few hours after a new 360° video of the ...

Though submarines were originally devised as stealth vessels, they can make a surprising amount of noise as they soar through the seas. In a bid to tackle this problem, the European Defense Agency ...

Oscar Propulsion Limited and the University of Strathclyde have come up with a way to reduce underwater radiated noise from ship propellers. According to Oscar Propulsion, its patented PressurePores ...