interesting that the rotor sail principle can be used with planes too: https://en.wikipedia.org/wiki/Magnus_effect#In_aviation https://en.wikipedia.org/wiki/Ma

interesting that the rotor sail principle can be used with planes too: https://en.wikipedia.org/wiki/Magnus_effect#In_aviation https://en.wikipedia.org/wiki/Magnus_effect#In_aviation (can't help but think "tilt rotor" of a different kind)