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Originally Posted by Ian
When an object is spinning, I'm not sure one can say that there is a consistent leading and trailing edge.
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I just compared the boomerang to a one bladed fan with an axial impeller. Now I`m unsure.
From the aerodynamic point of view, the notches will not have any postive effect. The boomerang is spinning and flying too slow, for a measurable result (imho).
On an axial or radial impeller such notches can reduce the turbulences and increase the degree of efficiency of the impeller. No one should laugh about this, I have a patent for notches on impellers.
So the idea of the aerodynamic improvement is really good from the technical point of view (state of the art for fans and compressors)
Roland