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The 797: Boeing’s New Regional Jet

The 797: Boeing’s New Regional Jet. Lawrence Stewart AA 241B March 16, 2006. Design Requirements. 85 passengers Takeoff field length of 6,500 ft Cruise Mach number of 0.8 Range of 1,600 nm. Similar, Existing Regional Jets. Baseline Design Estimates. MTOW = 81,600 lb S ref = 740 ft 2

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The 797: Boeing’s New Regional Jet

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  1. The 797: Boeing’s New Regional Jet Lawrence Stewart AA 241B March 16, 2006

  2. Design Requirements • 85 passengers • Takeoff field length of 6,500 ft • Cruise Mach number of 0.8 • Range of 1,600 nm

  3. Similar, Existing Regional Jets

  4. Baseline Design Estimates • MTOW = 81,600 lb • Sref = 740 ft2 • SLS thrust per engine = 14,200 lb • Later changed to 12,240 lb • Initial cruise altitude = 30,000 ft

  5. Baseline Design, Cross-section

  6. Baseline Design, Cabin Layout

  7. Baseline Design, Top View

  8. Baseline Design, Performance • Takeoff field length = 7,072 ft • Second segment climb gradient = 1.29% • Range = 2,047 nm • Landing field length = 4,586 ft

  9. Baseline Design, Summary Chart No feasible region

  10. Takeoff field length Reduce the TOW Increase the takeoff flap deflection Increase Sref Increase the SLS thrust per engine Second segment climb gradient Increase the SLS thrust per engine Increase the AR Reduce the takeoff flap deflection Reduce the TOW Optimization Process

  11. Optimization Process, Continued Then, select all of the design variables except cruise Mach number and iterate 2,000 times. By hand: • Reduce the TOW • Increase Sref • Increase the AR • Increase the SLS thrust per engine • Increase the initial and final cruise altitudes

  12. Final Design, Summary Chart Sref = 675 ft2, MTOW = 77,394 lb

  13. What Changed

  14. Performance Comparison

  15. Final Design, Top View

  16. Geometry Comparison

  17. Lessons Learned • You have to start somewhere • Look at similar, existing airplanes • Estimate initial parameters • Airplane design is an iterative process • Everything is a tradeoff

  18. Future Studies • Reduce noise • Reduce emissions • Composites?

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