See a correction of my now old calculation with likely other mistakes on Makani's presentation in AWEC2017. I put again the supposed results:
from 33 m² onboard turbines: 1/2 x 33 x 1.2 x 54³ x 0.2 = a little more than 600 kW. The usual formula of wind energy by swept area is applied for this time;
now from the supposed 40 m² of the wing, assuming a lift coefficient of 2, a L/D ratio of 12 (with tether drag): 40 x 1.2 x 2/27 x 2 x 10³ x 12² x 0.65 = about 660 kW. Derived Loyd’s formula is used.
Waiting for real measures!