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 that ...

The Macchi-Castoldi MC.72 was built to restore Italian prestige after Britain dominated the Schneider Trophy seaplane races.

Propellers affect more than speed and fuel economy. In fact, the more outboards there are hanging on the transom, the more propeller selection dictates a boat’s ride, minimum planing speed, and ...