If you look up the story of the "Gimli Glider" the auxiliary power turbine is mentioned there.
In general, the motor is the best place to get power for a generator. However, there might be opportunities for one flapping in the wake, where things are already messed up and energized. I'm not advocating dragging a prop in the turbulence, but rather extracting energy from the sideways component of it. However, the space is probably better used for a long tail.
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