At the very crux of engineering is the desire to problem-solve, optimize, and squeeze out every bit of efficiency possible from the system being built. Aircraft design and aeronautical engineering ...

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 ...

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 ...