I didn't mean to start an argument.

If the blade is well designed and tests as highly efficient by something like the Froude formula, then an extra third blade will make a smoother rotation in flight.

You said that book only covered a small part of how lift is produced. The model airplane book covers a lot. The book by Weick is from years of research and wind tunnel testing. I have a background in teaching basic rotary wing aerodynamics, and neither you nor I would ever make it thru all of that book. My answer is what contained a small part of info.