1. Perry Overbey Chad Vetter Bill Viste David Perveiler Lee Hargrave Doug Heizer Steve Moss Final Design Report: Black Lightning

2. AIAA RFP Background –Advanced deep interdiction aircraft –Antecedent aircraft F-117, F-15E, B-1, B-2 Mission Requirements –Supercruise: Mach 1.6 –Stealth exceeding F-117 –Range: 3500 nm EL: GOOD BULLET CHART

3. Configuration Down-Selection Key Design Parameters Established: –Stealth Requirement –Supercruise Requirement Several Configurations Proposed: Several Configurations Proposed: Config. 9 Config. 11 Config. 12b EL: GOOD COMPARISON

4. Radar Cross Section (RCS) Geometric Methods –Number of Planform Angles –Flat Panel vs. Doubly-Curved EL: GOOD EXPLANTION

5. Radar Cross Section RCS Results: –POFACETS Used for Comparative RCS Measure: Result: Black Lightning was nearly equivalent Black LightningV-Tail (F-117) EL: NICE ANALYSIS BUT NOT LABELED WELL

6. Interdisciplinary Trade Studies Reduce Gross takeoff Weight to minimize cost A/C length trade study –A/C length 100 ft EL: GOOD WORK ( small # font ) redundant Avoid single sub-bullets

7. Trade Studies (cont.) Wing area –Wing area 2000 ft 2 Leading edge sweep –Limited by mach cone –Initial sweep: 51° –Final sweep: 55° EL: HARD TO READ FONT

8. Constraint Diagram Initial design point –T/W = 0.45 –W/S = 110 lb/ft 2 EL: TOO BUSY

9. Results All performance requirements met Mission duration – 4.17 hours Mission radius – 1,750 nm Mission fuel required – 56,497 lb Balanced field length –Standard day – 2,814 ft –Icy runway – 3,524 ft Landing distance – –Standard day – 3,488 ft –Icy runway – 7,494 ft EL: Good summary- but watch sig figs

10. Measures of Merit EL: clean lines

11. Measures of Merit EL: Good work but too busy

12. Aerodynamics FLUENT Static Pressure Gradient at Trailing Edge of NACA 64-206 at Flight Conditions EL: Good analysis but big picture?

13. Parasite Drag EL: Good buildup

14. Cockpit Fuel Tank Avionics Bay Wing Tanks Nozzle and Trough Diffuser Inlet Face Internal Configuration EL: nice slide

15. CG Movement High Fuel Weight –CG Movement Throughout Mission EL: no yellow, don’t box figs

16. Lift Distribution Computed at 50% Fuel Load Used Proportional Distribution for Spanwise Lift Used to Construct Shear and Bending Moments Spanwise Lift DistributionChordwise Lift Distribution EL: small font, negative chord-wise lift and units?

17. Wing Structural Layout Five Main Spars Modeled as Cantilevered I-Beams 15 Ribs placed at 24” Intervals Analyzed using ANSYS to Find Max. Stresses EL: nice pics of what?

18. Propulsion Configuration Diffuser and Nozzle Configuration Single Expansion Ramp 2-D Ejector Nozzle S- duct for Stealth Cooling Air Bypass Shut-Off Doors Sensors 5% Duct Oversize EL: good slide

19. Frontal Dimension and Weight –Comparison with P&W F100 –NASA EngineSim Physical Engine Sizing BRP 1.1 OnX BRP.72 OnX BRP.72 F100 Scaled M dot Scaled M dot MatchM dot Get Area BRP 1.1 F100 Rescaled Scaled Area EL: equations would have been better than pictures

20. Diffuser Sizing EL: good use of published data (citation?)

21. Stability and Controls Primary Objectives of S&C –Obtain tail size and geometry –Determine control surface size and arrangement –Determine dynamic stability characteristics EL: nice image for orientation

22. Dynamic Stability Analysis Determination of Subsonic Nondimensional Stability Derivatives –Roskam’s method Based on USAF Datcom Assumed an effective static margin to account for the stability augmentation system (No equivalent lateral assumption made) EL: good table

23. Cost Analysis Unit Price for 200 Aircraft Sold: –$97.08 Million Operation Cost per Hour: –$13,139 /hr Price per Pound of Empty Weight: –$1,582 /lb EL: basis?

24. Cost Verification Cost Verification Through Comparison –B-2 Spirit –F-117 Nighthawk –F-15 Eagle Same Number of Aircraft Purchased for Each Case EL: unhelpful comparison

25. Conclusion Meets or Exceeds all RFP Requirements Major Design Drivers –Low Observability –Supercruise EL: good conclusion perhaps bit too simplified

26. Aircraft Design Review, 9 April 2002 Face audience Use story links Know/practice charts (but don’t memorize) Use pointer for figures