Unducted fans (UDFs), also known as propfans or open rotor engines, first popped up in the 1980s. Typically, there's a lot of blades, and they're swept back, and heavily twisted. The rear blades are twisted in the opposite direction to the front ones; sometimes they counter-rotate, others don't rotate at all, acting as variable-pitch stator blades to help with flow recovery.
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