I realized that to develop a factible mill force on aerobot is not an easy task. To nail down on the grownd, the aerobot need a good and smart anchor, the other problem is the weight of anchor, the other problem is a resistant and long rope such as nanotube. It adds some weigth to the aerobot, the other problem is that aerobot must have own navigations controls to maintain in a good direction against the wind so that the mills can provide the maximum output of energy with an proper angle against the wind. The other problem is that aerobot's nose will tend below due to the rope force toward the land. At the end, there are many challenges and they must review one by one on how tthey can be solved completely.

Rodolfo