[PDF via NewAtlas] Inspired by some of the experiments with “ring wings” in the early 20th Century, researchers iterated on various toroidal propeller geometries until arriving at one that ...

[PDF via NewAtlas] Inspired by some of the experiments with “ring wings” in the early 20th Century, researchers iterated on various toroidal propeller geometries until arriving at one that ...

The development of advanced turboprop geometries like counter rotating open turboprop configurations ... In order to reach that goal a detailed knowledge of the highly unsteady flow around and in the ...