propellers rotating even when the engines were removed.
Props will rotate, given sufficient airflow.
Surely one would park them long term with blades feathered to 'neutral' or whatever the term is. Anyway, seeing some physical or human phenomenon and leaping to a rather different conclusion to the majority is rather the point.
Just like not all derailleurs are indexed, not all props can be feathered.
@chez_jay started
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Props will rotate, given sufficient airflow.