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F-22 EXTERNAL CONFIGURATION REFINEMENT COMPLETE

 F-22 EXTERNAL CONFIGURATION REFINEMENT COMPLETE
 MARIETTA, Ga., Feb. 25 /PRNewswire/ -- The external design of


the Lockheed-Boeing-General Dynamics F-22 has been finalized, marking a major milestone in the development of the Air Force's next-generation air superiority fighter.
 The external lines define basic performance and radar signature characteristics, which are key items needed to complete the F-22's overall design.
 The design will first be used in building radar cross section models and numerous wind tunnel models to validate the external configuration. Having firm external lines will also now allow engineers to complete the internal design of the F-22, and eventually prepare tooling for manufacturing aircraft.
 The differences between the YF-22 prototype and the design of the F-22 are relatively subtle, but they result in significant improvements to the air vehicle. Specific changes include:
 -- Increasing the span of the diamond-shaped wing from 43 feet on the YF-22 to 44 feet 6 inches on the F-22. This improves maneuver performance and subsonic cruise efficiency by reducing drag.
 The F-22 wing area is 840 square feet, exactly the same as that of the YF-22. The wing leading edge sweep was changed from 48 degrees to 42 degrees to enhance maneuver performance. All other perimeter edges having the same sweep as the wing leading edge were also changed to 42 degrees for radar cross section (RCS) reduction purposes.
 -- The F-22 wing root thickness was decreased from that of the YF-22 to reduce drag across the Mach number range. The wing camber and twist was also modified to improve the fighter's supersonic maneuver performance.
 -- The area of the vertical tails was reduced to 89 square feet per side on the F-22 from 109 square feet per side on the YF-22, which was found to have an overly conservative tail design. The downsized vertical tails will result in less weight, reduced drag, and reduced aircraft height -- from the YF-22's 17 feet, 7 inches, to 16 feet, 5 inches on the F-22.
 -- The inlet lip is being moved aft approximately 1.5 feet relative to that of the YF-22 to reduce weight and enhance stability and control.
 -- The cockpit was moved forward and the nose was made blunter for the F-22 relative to the YF-22 for enhanced radar performance. The forward movement of the cockpit also slightly improves the pilot's over-the-nose vision.
 -- The F-22 will be 62 feet, 1 inch long, or 25 inches shorter than the YF-22's length of 64 feet, 2 inches.
 -- The horizontal tail area for both the F-22 and the YF-22 is approximately 68 square feet per side. The trailing edge of the F-22's tail is scarfed and aligned with the aftbody boom trailing edge to produce one continuous line, rather than having separate short lines for the boom trailing edge and inboard tail as on the YF-22.
 The external lines of the single-seat F-22A and tandem-seat F-22B were finalized on Dec. 16, and were then reviewed by the F-22 System Program Office during the F-22 Air Vehicle Requirements/Design Review Update meeting held here between Dec. 18-20, 1991.
 The F-22 is being developed by a team led by Lockheed Aeronautical Systems Co. in Marietta, Ga., which is partnered with Boeing Defense & Space Group, Military Airplanes Division in Seattle, and General Dynamics Fort Worth Division in Fort Worth, Texas. United Technologies Pratt & Whitney in West Palm Beach, Fla., is developing the F119-PW-100 turbofan engines that will power the F-22.
 Twenty-six major subcontractors in 15 states and 650 suppliers in 32 states are also key members of the F-22 team.
 -0- 2/25/92
 /NOTE TO EDITORS: Comparative drawings of the YF-22 Prototype and the Production F-22 are available upon request.
 NOTE TO PHOTO EDITORS: In the future, please use only photos of the Pratt & Whitney-powered prototype, as it more accurately reflects the F-22. This airplane can be recognized by the blue band with stars at the tips of the verticle fins (both the inside and outside of the fins are painted), the P&W Eagle logo on the sides of the intakes, or by the N22YX serial number. Please DO NOT use photos of the General Electric-powered YF-22./
 /CONTACT: Jeff Rhodes of Lockheed, 404-494-2702; Elliot Pulham of Boeing, 206-655-1198; or Mike Hatfield of General Dynamics, 817-777-4976/ CO: Lockheed Aeronautical Systems Co.; Boeing Defense & Space Group;
 General Dynamics Fort Worth Division; United Technologies Pratt
 & Whitney ST: Georgia IN: ARO SU:


BN-BR -- AT012 -- 2489 02/25/92 15:50 EST
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No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 1992 Gale, Cengage Learning. All rights reserved.

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Date:Feb 25, 1992
Words:733
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