The Lockheed F-117 Nighthawk is a stealth ground attack aircraft formerly operated by the United States Air Force. The F-117A's first flight was in 1981, and it achieved Initial Operational Capability status in October 1983. The F-117A was "acknowledged" and revealed to the world in November 1988.
A product of the Skunk Works and a development of the Have Blue technology demonstrator, it became the first operational aircraft initially designed around stealth technology. The F-117A was widely publicized during the Persian Gulf War of 1991.
The Air Force retired the F-117 on 22 April 2008, primarily due to the fielding of the more effective F-22 Raptor and the upcoming F-35 Lightning II.
Development
The F-117 was born after combat experience in the Vietnam War when increasingly sophisticated Soviet surface-to-air missiles (SAMs) downed heavy bomber flights.
In 1964, Pyotr Ya. Ufimtsev, a Russian mathematician, published a seminal paper, "Method of Edge Waves in the Physical Theory of Diffraction", in the Journal of the Moscow Institute for Radio Engineering, in which he showed that the strength of a radar return is related to the edge configuration of an object, not its size. Ufimtsev was extending theoretical work published by the German physicist Arnold Sommerfeld. Ufimtsev demonstrated that he could calculate the radar cross-section across a wing's surface and along its edge. The obvious conclusion was that even a large airplane could be made stealthy by exploiting this principle. However, the airplane's design would make it aerodynamically unstable, and the state of computer science in the early 1960s could not provide the kinds of flight computers which allow aircraft such as the F-117, and B-2 Spirit to stay airborne. However, by the 1970s, when a Lockheed analyst reviewing foreign literature found Ufimtsev's paper, computers and software had advanced significantly, and the stage was set for the development of a stealthy airplane.
Senior Trend
The F-117 was a black project, an ultra-secret program for much of its life, until the late 1980s. The project began in 1975 with a model called the "Hopeless Diamond" (a wordplay on the Hope Diamond due to its appearance). In 1977 Lockheed produced two 60% scale models under the Have Blue contract. The Have Blue program was a stealth technology demonstrator that lasted from 1976 to 1979. The success of Have Blue led the Air Force to create the Senior Trend program which developed the F-117.
The decision to produce the F-117A was made on 1 November 1978, and a contract awarded to Lockheed Advanced Development Projects, popularly known as the Skunk Works , in Burbank, California. The program was led by Ben Rich. Rich called on Bill Schroeder, a Lockheed mathematician, and Denys Overholser, a computer scientist, to exploit Ufimtsev's work. They designed a computer program called Echo, which made it possible to design an airplane with flat panels, called facets, which were arranged so as to scatter over 99% of a radar's signal energy "painting" the airplane.
The F-117 first flew in June 1981, only 31 months after the full-scale development decision. The first production F-117A was delivered in 1982, operational capability was achieved in October 1983. The Air Force denied the existence of the aircraft until 1988, when a grainy photograph was released to the public. In April 1990 two were flown into Nellis Air Force Base, Nevada, arriving during daylight and visible to a crowd of tens of thousands. Five Full Scale Development (FSD) aircraft built and were designated "YF-117A". A total of 59 production F-117s were delivered through July 1990.
As the Air Force has stated, "Streamlined management by Aeronautical Systems Center, Wright-Patterson AFB, Ohio, combined breakthrough stealth technology with concurrent development and production to rapidly field the aircraft... The F-117A program demonstrates that a stealth aircraft can be designed for reliability and maintainability." The aircraft maintenance statistics are comparable to other tactical fighters of similar complexity. Logistically supported by Sacramento Air Logistics Center, McClellan AFB, California, the F-117A was kept at the forefront of technology through a planned weapon system improvement program located at USAF Plant 42 at Palmdale, California.
Several of the F-117s were painted with a gray camouflage pattern in an experiment to determine the effectiveness of the F-117's stealth during daylight conditions. 2004 and 2005 saw several mid-life improvement programs implemented on the F-117, including an avionics upgrade.
Designation
The operational aircraft had the official designation of "F-117A". Most modern U.S. military aircraft use post-1962 designations in which the designation "F" is usually an air-to-air fighter, "B" is usually a bomber, "A" is usually a ground-attack aircraft, etc. (Examples include the F-15, the B-2, and the A-6.) The Stealth Fighter is primarily a ground-attack aircraft so its "F" designation is inaccurate.
The designation "F-117" seems to indicate that it was given an official designation prior to the 1962 U.S. Tri-Service Aircraft Designation System and could be considered numerically to be a part of the earlier "Century series" of fighters. The assumption prior to the revealing of the aircraft to the public was that it would likely receive the designation F-19 as that number had not been used. However there were no other aircraft to receive a "100" series number following the F-111. Captured Soviet fighters were given F-series numbers for their evaluation by U.S. test pilots, and with the advent of the Teen Series fighters, most often Century Series designations.
As with other exotic military aircraft types flying in the southern Nevada area, such as captured fighters, an arbitrary radio call of "117" was assigned. This same radio call had been used by the enigmatic 4477th "Red Hats/Red Eagles" unit that often had flown expatriated MiGs in the area, but there was no relationship to the call and the formal F-19 designation then being considered by the Air Force. Apparently, use of the "117" radio call became commonplace and when Lockheed released its first flight manual ("dash one"), F-117A was the designation printed on the cover.
A televised documentary quoted a senior member of the F-117A development team as saying that the top-notch fighter pilots required to fly the new aircraft were more easily attracted to an "F" plane, as opposed to a "B" or "A" aircraft.
F-117N “Seahawk”
In the early 1990s, Lockheed began to pitch an upgraded, carrier capable variant of the F-117 dubbed the “Seahawk” as an alternative to the canceled A/F-X program. The unsolicited proposal was received poorly by the Department of Defense, who had little interest in the single mission capabilities of such an aircraft, particularly as it would take money away from the Joint Advanced Strike Technology program (which evolved into the Joint Strike Fighter). The new aircraft would have differed from the land based F-117 in several ways, including the addition “of elevators, a bubble canopy, a less sharply swept wing and reconfigured tail". The “N” variant would also be re-engined to use General Electric F414 turbofans instead of the older General Electric F404s. Furthermore the aircraft would be optionally fitted with hardpoints, allowing for an additional 8,000 lb of payload, and a new ground attack radar with air-to-air capability. In that role the F-117N could carry AIM-120 AMRAAM air-to-air missiles.
After being rebuffed by the Navy, Lockheed submitted an updated proposal that included afterburning capability and a larger emphasis on the F-117N as a multimission aircraft, rather than just a strike aircraft. In efforts to boost interest, Lockheed also proposed an F-117B land-based variant that shared most of the F-117N capabilities. This variant was proposed to both the US Air Force and the RAF. This renewed F-117N proposal was also known as the A/F-117X . Neither the F-117N or the F-117B were purchased by any party.
Design
The F-117 is shaped to deflect radar signals and is about the size of an F-15 Eagle. The single-seat Nighthawk is powered by two non-afterburning General Electric F404 turbofan engines, and has quadruple-redundant fly-by-wire flight controls. It is air refuelable. To lower development costs, the avionics, fly-by-wire systems, and other parts are derived f
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