Sharrow's extraordinary looped propellers were already some 30% more efficient than traditional designs – and now the company has put two of them together into a coaxial, contra-rotating prop ...

Suzuki’s lower unit features a two-stage gear reduction from the powerplant to the props, first between the drive shaft and the crankshaft, and then within the gear case in order to achieve the ...

Many contemporary marine vehicles are being outfitted with contra-rotating propellers (CRP), and naval architects need the ability to model the performance of CRP systems – a capability that has ...

The new contra-rotating version Sharrow’s earlier propeller design (a finalist in the 2023 Innovation by Design awards) rotated the blades go in a single direction.

The boat also felt more responsive at the dock, comparable to the difference between a sterndrive with dual contra-rotating propellers and a single prop. Sharrow achieved this through the blade design ...

Hurtigruten's Sea Zero project is progressing well with a new phase of model testing that shows promising results in reducing energy demand for zero emissions, ... retractable sails, air lubrication ...

When I was a young kid obsessed with airplanes, my mom bought me a model of the Convair R3Y Tradewind flying boat. ... and geared to a set of contra-rotating propellers.