Novel contra-rotating propeller design through oblong paths

Unread postPosted: 10 May 2019, 02:54
by madrat
https://www.youtube.com/watch?v=GxlfHSu-iGY

It's a bit difficult to get it from the early part of the video. But about midway through it shows that one blade tip performs an oblong path as it rotates and the opposite blade tip forms a linear motion back and forth. I wonder if you couldn't apply this type of motion to jet turbines.