Unusual notches on very old boomerang

[Roland_M]

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.

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