Not OP but... maybe in a situation where one would normally deploy spoilers?
Larger aircraft require a way to bleed off energy from landing (assuming additional drag from flaps won't be sufficient), depending on their approach. Smaller aircraft usually does not have speedbrakes and can make do with power changes and flaps.
Propellers are giant speedbrakes if not feathered. Maybe in a "speedbrake" situation they could be allowed to "windmill" and do some regen? Not sure how important this is as one would be normally landing very soon. Other situations that do not involve descent, just reduce power.
Larger aircraft require a way to bleed off energy from landing (assuming additional drag from flaps won't be sufficient), depending on their approach. Smaller aircraft usually does not have speedbrakes and can make do with power changes and flaps.
Propellers are giant speedbrakes if not feathered. Maybe in a "speedbrake" situation they could be allowed to "windmill" and do some regen? Not sure how important this is as one would be normally landing very soon. Other situations that do not involve descent, just reduce power.