AnthillOmbudsman t1_irrgkhf wrote
If there's no combustion in the forward fan, why not just take the cowling off and have the forward fan running like a propeller? Would this still work? I know there's propfans but I still want to know what happens if you take the forward fan cowling off a GE90 and run it that way with the fan exposed.
timberwolf0122 t1_irrhvh8 wrote
It would work, just not as well. The ducted fans are upto 90% more efficient than a free fan and quieter too. Additionally the duct protects the fan from debris and protects ground crew from accidental contact
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