After these last few comments highlighting the problem of the weight of a conventional wind turbine on board, how can we not mention the achievements of KiteX?
Weight nacelle of 130 kg + weight rotor of 60 kg = 190 kg.
I would make two remarks.
We find approximately this proportion, even though we do not have a hub in the classical sense of the term for TWT-11.
Second remark: the mass (190 kg) is close to that of a conventional wind turbine of also 5 kW (165 kg, video below), with a rotor diameter of only 4.3 m, but designed for a nominal wind speed of about 12 m/s (see the curve in the video below, at 2:07).
It seems that the mass depends on the desired power.
TWT-11 is designed for low wind speeds, allowing for higher production in the year at equal mass.
But since an AWES is designed for strong winds at high altitudes, would it be possible to design something like TWT-11, but for a nominal wind speed of 15 m/s for example? Would its mass then become comparable to that of a traditional wind turbine of the same dimensions (rotor diameter 11 m) but designed for winds of 15 m/s?