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0.75 mach number 95 PNdB Acceleration acre-seconds acres advanced gas airframe costs analysis basepoint composite material control system cruise mode cruise thrust CTOL data of Figure design cruise speed Direct Operating Cost divergence mach number DOC sensitivity Drag Coefficient drag divergence mach effect engine Evendale fan design fan pressure ratio fans and gas FPR fan system fuselage gas generator system GEl3 graphite-composite indicated l.25 FPR airplane l.40 FPR system lift coefficient lift-fan systems lift/cruise fan low speed lower minimum fuel nacelle nautical miles noise characteristics noise footprint nominal lift nozzle parameter percent control margin pitch potential pounds power setting propulsion system costs reduction relative remote lift-fan ride quality scroll short haul transport Step Input STOL structural weight T/W ratio takeoff weight thrust vector thrust-to-weight ratio trade study trip distances turbojet V/STOL short haul V/STOL transport vehicle vertical VTOL Takeoff weight saving wing loading