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1) Fuel costs went down2) Noise was an issue3) Reliability similar to turbofans would take a while to achieve4) It didn't suit underwing mounting on existing designs which meant unique airframes needed designing5) More efficient turbofans made enough improvement at lower risk.Modern geared high bypass turbofans are getting closer to propfan territory.
1) Fuel costs went down
2) Noise was an issue
3) Reliability similar to turbofans would take a while to achieve
4) It didn't suit underwing mounting on existing designs which meant unique airframes needed designing
5) More efficient turbofans made enough improvement at lower risk.
Modern geared high bypass turbofans are getting closer to propfan territory.
