Familiar looking - Chinese buoyant airborne turbine (BAT)

[PierreB]

@dougselsam

That 1.2 MegaWatts of turbines could weigh “less than one ton” because of carbon fiber. no, the generators alone would weigh orders of magnitude more than 1 ton.

@PierreB

Each wind turbine seems to be no more than 4.5 m in diameter (and not 6 m as I had supposed), leading to a swept area of 16 m². To reach 100 kW per turbine, even with an additional 20% efficiency of the duct, as announced in the article, it would require winds close to 30 m/s.

In the video on Can tallest wind turbines on lighter masts be also an alternative to AWES? I reproduced below, we can better assess the diameter of the wind turbines, which appears to be 5.5 m to 6 m: at 0:21, right next to a person, at 3:37, at 4:39…, assuming that the diameter of the balloon is 40 m as specified.

China's Wild New Inflatable Wind Turbine (1.2 MW Output)

@PierreB

generators were used for Makani to reach both high rpm and lightness.

If the generators are Makani-like, this could explain the low total mass indicated, “less than one ton”, assuming high winds and high rpm.
Thus, the rated (or rather maximal) power (1.2 MW) would be reached for winds of more than 20 or 25 m/s (which I have more or less evaluated in this topic), with a lifespan sufficient to carry out the tests.