Are they unducted fans, are they high tech propellers, or are they, as one wag put it, a bunch of bananas whirling around.I don't know, and it appears that regulatory authorities are in a similar conundrum.
The regulations if they are classed as turbofan blades are stricter, and thus the would add more weight, and the regulations if they were classed as a propeller.
It's a non-trivial issue that needs to be resolved.
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