New Design Needed?  After reading about the Rolls-Royce UltraFan large geared-turbofan technology demonstrator and the CFM56-7B fan-blade separations (May 7-20, p. 58), I wonder whether we are reaching a tipping point for fan and nacelle design. As fan diameters become ever larger, enclosing the fan within the nacelle dramatically increases nacelle weight and skin-friction drag.  At some point, it may become optimal to simply discard a one-piece nacelle. Instead, attach ...


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