Originally Posted by
musicrab
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I assume this means it won't be allowed to free-spin either (bad terminology but you know what I mean).
Music, I believe the term you are looking for is "wind-milling" as in allowing the fan/engine to spin, but with the engine in the off position, ie unpowered. I would think such a massive fan would have to windmill, or the drag would be enormous. Large fans can wind-mill without much fuss.