A brief study of the effects of turbofan-engine bypass ratio on short and long haul cruise aircraft

Technical Report · Mon Dec 01 04:00:00 EST 1975

OSTI ID:7240549

Keith, Jr, A L

A brief study of the effects of turbofan-engine bypass ratio on Breguet cruise range and take-off distance for subsonic cruise aircraft showed significant differences between short- and long-haul aircraft designs. Large thrust lapse rates at high bypass ratios caused severe reductions in cruise range for short-haul aircraft because of increases in propulsion system weight. Long-haul aircraft, with a higher fuel fraction (ratio of propulsion weight plus total fuel weight to gross take-off weight), are less sensitive to propulsion-system weight and, accordingly, were not significantly affected by bypass-ratio variations. Both types of aircraft have shorter take-off distances at higher bypass ratios because of higher take-off thrust-weight ratios.

• Research Organization: National Aeronautics and Space Administration, Langley Station, Va. (USA). Langley Research Center
• OSTI ID: 7240549
• Report Number(s): N-76-o12068; NASA-TN-D-7890
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330103* -- Internal Combustion Engines-- Turbine
330603 -- Vehicle Design Factors-- Engine System
AIRCRAFT
DESIGN
ENERGY CONSUMPTION
ENGINES
FUEL CONSUMPTION
MATHEMATICAL MODELS
OPERATION
TURBOJET ENGINES
WEIGHT