Good point. I made all wings the same, except for mirroring one set, for the sake of simplicity of construction. The airflow under the upper set will be contracted so a smaller diameter lower set of wings would do just fine, so yes, good idea. Might just do that if I ever get around iterating on this coaxial version of the levitator.

Hmm, Interesting, I have not even thought about that possibility! Its what you do not now that gets you....sigh...

@@amazingdiyprojects As I say Axel I might be wrong, we need to know the answer. It will be great learning about this machine and it will worth the effort either way. Yours is unique in that you can control each rotor speed individually and it's tip driven, very interesting stuff.

Well, I did come up with this for this specific build; a (relative) light weight simple wing structure. However, I would expect that there is just one like this somewhere else around already. Its a big world with a whole lot of wonderful creative people in it after all! :-) -That being said, it really does put a smile on my face that someone else understands and appreciate details like this, I did feel cleaver when I came up with this solution for making the leading edge light and stiff.

@@amazingdiyprojects For a few years now I have been trying to build the world’s last paper airplane. Not using any tape or glue. I have considered many designs. All have failed to achieve the desired results. My next design will look somewhat like a delta triangle hand glider or a stunt kite. The skin will be attached similarly to the way roll up blinds are attached to a central rod. That will limit the shape and size of the plane. I would consider using your design if I wanted to make a curved leading edge. I will keep it in mind. So, yes. I could make your entire design only out of paper. I especially also like your three part blade design. That could be key to making my design lighter. If I went with a soft leading edge design like an umbrella has .