The rotating, cylindrical Flettner rotor sail is a mechanical sail that was first invented in the early 20 th century by Finnish engineer Sigurd Savonius. It was then popularized (and named after) ...

This modern technology is based on the Flettner rotor, invented by Finnish engineer Sigurd Savonius, and then demonstrated by Anton Flettner, in an Atlantic crossing, back in 1926.

A Finnish invention, a vertical axis Savonius wind turbine can be further improved shows a new study. Due to the mechanical modification of the rotor the power coefficient was shown to be ...

Norsepower’s Rotor Sail Solution is an updated version of the Flettner rotor, a concept that dates back to Finnish engineer Sigurd Savonius in the early 1900s.