The table 22.2 you refer is a part of the 22.4.2 Experimental Results .
The material realization of a rotating reel system is not easy, and I made it with what I had on hand. It is easy to understand that this realization was not optimized. If no, reading the chapter is sufficient. Page 11:
The efficiency of the flying rotor was not measured, but as it uses numerous semi-rigid blades forming a high-solidity rotor the efficiency is considered to be far below the value of the Betz limit.
An optimized model is studied further:
Page 32:
Considering the value of ω listed in Table 22.4 and using a tip speed limit of ≈ 70 m/s we can calcu-late the outer diameter of the rotor […]
Just read the chapter to find out. Then understanding becomes easier.