2/14/00Genglin Tang3 Introduction(Cont) Why ATF? [8,12] Update Generation F-15+F-16+F-117 F-15 (all out and all back) Su-27, Mig-29, and Mirage 2000 ATF (first look, first shoot, and first kill) Mig 1.42 and EF2000
2/14/00Genglin Tang4 Introduction Air Superiority [1,13]: Fighter performance, Radar, long-range missiles, short-range missiles, and combat mission radius.
2/14/00Genglin Tang6 Why F-22? Air dominance fighter YF-22: Maneuverability and better compromise YF-23: Supercruise and stealth [2,8,9,14,15,16,17]
2/14/00Genglin Tang7 F-22 technology  Supercruise, unlimited maneuverability, and stealth External Aircraft Geometry - Low observable - Low supersonic drag - Unrestricted Maneuverability Propulsion - Low observable supersonic inlet - Low observable augmenter/thrust vectoring nozzle Avionics - Common modules - Ada real time software - Liquid cooling for reliability - Low observable apertures -Radar -Infrared -Communication/Navigation -Electronics warfare Other subsystems and equipment - Low observable air data sensors - Low observable canopy
2/14/00Genglin Tang8 Configuration Features  -Blended wing-body with internal weapons bays and sufficient internal fuel volume for meeting long endurance mission. -Chinned forebody with radar-compatible nose, single piece canopy, and good pilot visibility (15 down look over nose). -Modified diamond wing with a wing span compatible with existing aircraft shelters, and constant chord full leading edge flaps, aileron and flaperons. -Scarfed wing tip to accommodate installation of various antennas. -All exterior edge angles aligned with either the wing leading or trailing edge angles.
2/14/00Genglin Tang9 Configuration Features(Cont)  -Twin, canted vertical tails; constant chord rudders. -All movable clipped diamond horizontal tails. -Two-dimensional, convergent-divergent exhaust nozzles with independent throat and exit area actuation and pitch axis thrust vectoring. -Freestream fixed geometry supersonic inlets with sweep cowl lips, boundary layer bleed and overboard bypass systems, and a relatively long subsonic diffuser having 100 percent line-of-sight RF blockage. -Integrated electronic flight/propulsion control system, totally software controlled.
2/14/00Genglin Tang11 Flow Patterns/Aerodynamics(Cont) increase: stronger vortex, breakdown moves upstream, and asymmetric trajectory of vortex
2/14/00Genglin Tang12 Control Surfaces/Maneuver [3,7,9,10,12] Pitch Control: H-tail + TV Roll control: ailerons + flaperons + differential H-tails Yaw control: V-tails with rudders + differential H-tails >25, rudder effectiveness decreases some high, aileron and flaperon effectiveness decreases Full span LE flaps: optimize the wing camber for better cruise and maneuvering performance and improve handling qualities At high H-tails play a key role because TV frees its traditional functions.
2/14/00Genglin Tang13 TV Envelope/Maneuver [3,10]
2/14/00Genglin Tang14 TV Gains/Maneuver [3,7,9,10,12] -Reduce weight 400 lbs. – (30~50 lbs.) -Control capabilities –Enhance pitch control –Free H-tails at high –Decrease field length –Optimize subsonic and supersonic maneuvering performance –Post-stall maneuvering and nose pointing ability
2/14/00Genglin Tang15 TV Gains/Maneuver(Cont) 
2/14/00Genglin Tang18 Avionics  Integrated avionics replaces federated avionics with CIP (Common Integrated Processor, a central brain with two equivalent Cray supercomputers), INEWS ( Integrated Electronics Warfare System), and CNI (Integrated Communication, Navigation, and Identification Avionics). Satisfy the desire of pilots KISS rule.
2/14/00Genglin Tang21 Lessons Performance: high speed -> maneuverability Handling: It always did what I wanted it to do and never did anything that I didnt want it to do -> fault tolerant function TV nozzle: 2D-> 3D, impact of evolution of propulsion on airplanes Role: quantity -> quality, knight destiny Information, Electronics and Materials
2/14/00Genglin Tang22 References 1. Aviation Week and space technology, pp.78~83, Sept. 6, 1999; pp.50~53, Nov. 29, 1999; pp.2, Jan.1, 2000; pp.50~55, Feb.7, 2000; pp.114~117, Feb.21, 2000. 2. Janes Aircraft, 1982, 1992, and 1998. 3. High Angle-of-Attack Flight Characteristics of the YF-22, Clark and Bernens, AIAA 91-3194. 4. AFRL F-22 dynamic wind tunnel test results, AIAA Paper 99-4015 (A99-36875), Gillard, William J. 5. CAIS for F-22, AIAA Paper 94-2130 (A94-28387), Hochner, Bill. 6. Computational simulation of the F-22 aircraft, AIAA Paper 98-0526 (A98-16381), Josyula, Eswar; Gordiner, Raymond E. 7. F-22 control law development and flying qualities, AIAA Paper 96-3379 (A96-35101), Harris, Jeffrey J. 8. Origins of the F-22 Raptor, AIAA Paper 98-5566@SAE Paper 985566 (A98-43081), Piccirillo, Albert C. 9. The evolution of the F-22 advanced tactical fighter (1992 Wright Brothers Lecture) AIAA Paper 92-4188 (A92-53999), MULLIN, SHERMAN N. 10. Thrust vector aided maneuvering of the YF-22 Advanced Tactical Fighter prototype, AIAA Paper 94-2105 (A94- 28371), Barham, Robert W. 11. Flying qualities demonstration maneuvers, AIAA Paper 94-2113 (A94-28376) Leggett, David B.; Cord, Thomas J. 12. Advanced tactical fighter to F-22 raptor : origins of the 21st century air dominance fighter / David C. Aronstein, Michael J. Hirschberg, Albert C. Piccirillo. Reston, Va. : American Institute of Aeronautics and Astronautics.Advanced tactical fighter to F-22 raptor : origins of the 21st century air dominance fighter / David C. Aronstein, Michael J. Hirschberg, Albert C. Piccirillo. 13. Tactical aircraft [microform] : F-15 replacement is premature as currently planned : report to the Chairman, Legislation and National Security Subcommittee, Committee on Government Operations, House of Representatives / United Sta Washington, D.C. : The Office ; Gaithersburg, MD.Tactical aircraft [microform] : F-15 replacement is premature as currently planned : report to the Chairman, Legislation and National Security Subcommittee, Committee on Government Operations, House of Representatives / United Sta 14. http://www.boeing.com/defense-space/military/f22/http://www.boeing.com/defense-space/military/f22/ 15. http://www.lmasc.lmco.com/f22/http://www.lmasc.lmco.com/f22/ 16. http://www.pratt-whitney.com/engines/military.htmlhttp://www.pratt-whitney.com/engines/military.html 17. http://www.wpafb.af.mil/museum/modern_flight/mf21a.htmhttp://www.wpafb.af.mil/museum/modern_flight/mf21a.htm