See also on
Semi-automatic launch mode described in 6.3 section, page 15.
And, in 6.4 section, page 17:
The KiweeOne can be brought back automatically, semi-automatically or manually. Auto and semi auto modes are only possible in moderate wind. The automatic mode allows KiweeOne to detect a decrease in wind force and rewind the rope belt without any user action. The wind turbine and the kite will then land close to the generator.
@Kitewinder had also intended to develop a 2.5 m in diameter Kiwee version:
The swept area would have been almost 5 times that of Kiwee, or almost 5 m², leading to a power of 1 kW instead of 200 W with a wind speed of 10 m/s. It can be deduced that the lifter kite would have increased from about 4 m² to 20 m² without taking account of mass penalty of turbine scaling.
For a 5-10 kW version, the lifter kite would be 100-200 m², assuming the same very good elevation angle. But the wind turbine aloft scales cubic, so a still higher kite area would be required.
I don’t know what could be a reliable method for autonomous takeoff and land. Perhaps using the propeller and the generator as motor to inflate the kite? Not easy, due to the rope-drive transmission.
It can be noted that a kite alone of same area, like a parasail, could produce about as much, certainly in the unfavorable yo-yo (here tether-aligned, not crosswind) mode.