As boring as propeller designs may seem to the average person, occasionally there’s a bit of a dust-up in the media about a ‘new’ design that ... commercial toroidal boat props exist too.

The the new CX propeller ... with more control of the boat and enhanced safety.” The company says that the loop-shaped design could be used anywhere, not just in water.

Despite being integral to aviation for more than a century, propellers have changed remarkably little since the Wright Brothers. A team at MIT’s Lincoln Lab has developed a new propeller shape ...