The propeller — a relic from the dawn of powered flight more than a century ago — is making a comeback as an emblem of aviation’s greener future. Rotors are proliferating on futuristic air taxis 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 ...

Sharrow knew it had a market disruptor on its hands the instant it transformed propeller blades into more efficient twisted loops. The hold-up of that disruption, however, has been in getting those ...