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 ...

These strangely-shaped twisted-loop propellers look like a revolutionary (sorry) advance for the aviation and marine sectors. Radically quieter than traditional propellers in both air and water, ...

1 Faculty of Engineering, Kanagawa University, Yokohama, Japan. 2 Faculty of Engineering, Kyushu Institute of Technology, Kitakyushu, Japan. 3 Ocean College, Zhejiang University, Zhoushan, China. 4 ...

Dowty Propellers (Brockworth, Gloucester, U.K.) supplies large (e.g., 4-meter-diameter) composite-bladed propellers for commercial and military turboprop aircraft, including the Dash 8-400 regional ...