Northrop YF-23

Northrop YF-23
Name	YF-23
Caption	The first YF-23 prototype, nicknamed "Black Widow II"
Type	Stealth fighter technology demonstrator
National origin	United States
Manufacturer	Northrop Corporation
First flight	27 August 1990
Status	Canceled
Primary user	United States Air Force

Northrop YF-23. The Northrop YF-23 was an American stealth fighter technology demonstrator developed for the United States Air Force during the late 1980s and early 1990s. It was designed and built by the Northrop Corporation, in partnership with McDonnell Douglas, to compete in the Advanced Tactical Fighter (ATF) program. The aircraft was noted for its distinctive diamond-shaped wings, V-tail, and advanced low-observable features, but ultimately lost the competition to the Lockheed YF-22.

Development and design

The YF-23 emerged from the Advanced Tactical Fighter program, a rigorous United States Department of Defense initiative to field a next-generation air superiority fighter. The Northrop Corporation led the design team, leveraging its prior experience from the B-2 Spirit bomber program, while McDonnell Douglas served as the principal subcontractor. Key design goals included achieving superior stealth characteristics, Supercruise capability, and high-altitude performance, which led to the aircraft's unique diamond-wing planform and widely spaced Pratt & Whitney or General Electric engines buried in the fuselage. The design team, which included notable engineers like Hal Markarian, prioritized reduced Radar cross-section over extreme maneuverability, a philosophical difference from its competitor. The United States Air Force awarded contracts for two flying prototypes, each powered by a different engine option, to thoroughly evaluate the design's potential.

Operational history

The first prototype, nicknamed "Black Widow II" after the P-61 Black Widow, made its maiden flight on 27 August 1990 at Edwards Air Force Base, piloted by Paul Metz. The second aircraft, "Gray Ghost", first flew on 26 October of the same year. During the flight test program, the YF-23 demonstrated impressive performance, achieving supercruise speeds estimated at Mach 1.8 and exhibiting a very low observable signature. However, the Lockheed YF-22 team conducted a more aggressive and public flight demonstration, showcasing its Thrust vectoring capability. After a lengthy evaluation, the United States Secretary of the Air Force announced in April 1991 that the Lockheed YF-22 was selected as the winner of the ATF competition. The primary reasons cited were the YF-22's perceived lower risk and greater design maturity, particularly in its Avionics integration and weapons systems.

Specifications (YF-23)

* **Crew:** 1 * **Length:** 67 ft 5 in (20.6 m) * **Wingspan:** 43 ft 7 in (13.3 m) * **Height:** 13 ft 11 in (4.3 m) * **Empty weight:** 29,000 lb (13,100 kg) * **Max takeoff weight:** 62,000 lb (28,100 kg) * **Powerplant:** 2 × Pratt & Whitney YF119 or General Electric YF120 afterburning Turbofan engines * **Maximum speed:** Mach 2.2+ at altitude * **Supercruise speed:** Mach 1.8 (estimated) * **Service ceiling:** 65,000 ft (19,800 m) (estimated)

Variants

Only two flying prototypes were constructed. The first aircraft, Air Force serial number 87-0800, was powered by Pratt & Whitney YF119 engines. The second prototype, serial number 87-0801, was equipped with the more advanced General Electric YF120 variable-cycle engines. No other variants were developed following the program's cancellation, though some design concepts and technologies were studied for potential application in other Northrop Corporation projects.

Aircraft on display

Both YF-23 prototypes are preserved in American museums. The first prototype, "Black Widow II", is on display at the National Museum of the United States Air Force at Wright-Patterson Air Force Base in Ohio. The second prototype, "Gray Ghost", is housed at the Western Museum of Flight near Torrance, California. These aircraft serve as important artifacts of a pivotal competition in modern Military aviation history.

Legacy and influence

Although it never entered production, the YF-23 is widely regarded by aviation enthusiasts and analysts as a highly advanced and potentially superior stealth design. Its radical airframe influenced later studies on very-low-observable configurations and high-altitude performance. The program also provided critical data on Supercruise propulsion and advanced materials. The loss to the Lockheed YF-22, which entered service as the F-22 Raptor, remains a subject of debate regarding the United States Air Force's procurement priorities. The YF-23's design philosophy, emphasizing stealth and speed over close-in agility, continues to be referenced in discussions about future sixth-generation fighter concepts.

Category:Stealth aircraft Category:United States fighter aircraft 1990–1999 Category:Twinjets Category:Cancelled military aircraft projects of the United States Category:Northrop aircraft