Emrax from Siemens is a very light motor-generator. The pdf above provides data. As mentioned on the page 21, a motor of 40 kg would have a peak motor power of 125 kW at 1200 rpm, 330 kW at 3200 rpm, and a continuous power of 70 kW and 180 kW, according to the load.
It could perhaps be a very light hydro turbine as a lot power is delivered at a low rpm. But also a use as generator for Flygen, or even yoyo mode, could be aimed.