McDonnell Douglas F-4 Phantom II
The McDonnell Douglas F-4 Phantom II is an American tandem two-seat, twin-engine, all-weather, long-range supersonic jet interceptor and fighter-bomber that was developed by McDonnell Aircraft for the United States Navy. It entered service with the Navy in 1961, then was adopted by the United States Marine Corps, and the United States Air Force, and within a few years became a major part of their air arms. A total of 5,195 Phantoms were built from 1958 to 1981, making it the most-produced American supersonic military aircraft in history and a signature combat aircraft of the Cold War.
The Phantom is a large fighter with a top speed of over Mach 2.2. It can carry more than 18,000 pounds of weapons on nine external hardpoints, including air-to-air missiles, air-to-ground missiles, and various bombs. Like other interceptors of its time, the F-4 was initially designed without an internal cannon, but some later models incorporated an internal M61 Vulcan rotary cannon. Beginning in 1959, it set 15 world records for in-flight performance, including an absolute speed record and an absolute altitude record.
The F-4 was used extensively during the Vietnam War, first as the principal air superiority fighter for the U.S. Air Force, Navy, and Marine Corps, and later as a ground-attack and aerial reconnaissance aircraft. During the Vietnam War, all five American servicemen who became acesone U.S. Air Force pilot and two weapon systems officers, one U.S. Navy pilot and one radar intercept officer did so in F-4s. The Phantom remained a major part of U.S. military air power into the 1980s, when it was gradually replaced by more modern aircraft such as the F-15 Eagle and F-16 Fighting Falcon in the U.S. Air Force, the F-14 Tomcat in the U.S. Navy, and the F/A-18 Hornet in the U.S. Navy and U.S. Marine Corps.
The Phantom was used for reconnaissance and Wild Weasel missions in the 1991 Gulf War, and finally left combat service in 1996. It was the only aircraft used by both U.S. flight demonstration teams: the United States Air Force Thunderbirds and the United States Navy Blue Angels. The was also operated by the armed forces of 11 other nations. Israeli Phantoms saw extensive combat in several Arab–Israeli conflicts, while Iran used its large fleet of Phantoms, acquired before the fall of the Shah, in the Iran–Iraq War. The F-4 remains in active service with the Hellenic Air Force and the Turkish Air Force. Turkey's most recently upgraded F-4E Terminator variant is to remain in service until at least 2030.
Development
Origins
In 1952, McDonnell's Chief of Aerodynamics, Dave Lewis, was appointed by CEO Jim McDonnell to be the company's preliminary design manager. With no new aircraft competitions on the horizon, internal studies concluded the Navy had the greatest need for a new and different aircraft type: an attack fighter.In 1953, McDonnell Aircraft began work on revising its F3H Demon naval fighter, seeking expanded capabilities and better performance. The company developed several projects, including a variant powered by a Wright J67 engine, and variants powered by two Wright J65 engines, or two General Electric J79 engines. The J79-powered version promised a top speed of Mach 1.97. On 19 September 1953, McDonnell approached the United States Navy with a proposal for the "Super Demon". Uniquely, the aircraft was to be modular, as it could be fitted with one- or two-seat noses for different missions, with different nose cones to accommodate radar, photo cameras, four 20 mm cannon, or 56 FFAR unguided rockets in addition to the nine hardpoints under the wings and the fuselage. The Navy was sufficiently interested to order a full-scale mock-up of the F3H-G/H, but felt that the upcoming Grumman XF9F-9 and Vought XF8U-1 already satisfied the need for a supersonic fighter.
The McDonnell design was therefore reworked into an all-weather fighter-bomber with 11 external hardpoints for weapons and on 18 October 1954, the company received a letter of intent for two YAH-1 prototypes. Then on 26 May 1955, four Navy officers arrived at the McDonnell offices and, within an hour, presented the company with an entirely new set of requirements. Because the Navy already had the Douglas A-4 Skyhawk for ground attack and F-8 Crusader for dogfighting, the project now had to fulfill the need for an all-weather fleet defense interceptor. A second crewman was added to operate the powerful radar; designers believed that air combat in the next war would overload solo pilots with information.
XF4H-1 prototype
The XF4H-1 was designed to carry four semi-recessed AAM-N-6 Sparrow III radar-guided missiles, and to be powered by two J79-GE-8 engines. As in the McDonnell F-101 Voodoo, the engines sat low in the fuselage to maximize internal fuel capacity and ingested air through fixed geometry intakes. The thin-section wing had a leading edge sweep of 45° and was equipped with blown flaps for better low-speed handling.Wind tunnel testing had revealed lateral instability, requiring the addition of 5° dihedral to the wings. To avoid redesigning the titanium central section of the aircraft, McDonnell engineers angled up only the outer portions of the wings by 12°, which averaged to the required 5° over the entire wingspan. The wings also received the distinctive "dogtooth" for improved control at high angles of attack. The all-moving tailplane was given 23° of anhedral to improve control at high angles of attack, while still keeping the tailplane clear of the engine exhaust. In addition, air intakes were equipped with one fixed ramp and one variable geometry ramp with angle scheduled to give maximum pressure recovery between Mach 1.4 and Mach 2.2. Airflow matching between the inlet and engine was achieved by bypassing the engine as secondary air into the exhaust nozzle. All-weather intercept capability was achieved with the AN/APQ-50 radar. To meet requirements for carrier operations, the landing gear was designed to withstand landings with a maximum sink rate of, while the nose strut could extend by to increase angle of attack on the catapult portion of a takeoff.
On 25 July 1955, the Navy ordered two XF4H-1 test aircraft and five YF4H-1 pre-production examples. The Phantom made its maiden flight on 27 May 1958 with Robert C. Little at the controls. A hydraulic problem precluded the retraction of the landing gear, but subsequent flights went more smoothly. Early testing resulted in redesign of the air intakes, including the distinctive addition of 12,500 holes to "bleed off" the slow-moving boundary layer air from the surface of each intake ramp. Series production aircraft also featured splitter plates to divert the boundary layer away from the engine intakes. The aircraft was soon in competition with the XF8U-3 Crusader III. Due to cockpit workload, the Navy wanted a two-seat aircraft and on 17 December 1958 the F4H was declared the winner. Delays with the J79-GE-8 engines meant that the first production aircraft were fitted with J79-GE-2 and −2A engines, each having 16,100 lbf of afterburning thrust. In 1959, the Phantom began carrier suitability trials with the first complete launch-recovery cycle performed on 15 February 1960 from.
There were proposals to name the F4H "Satan" and "Mithras". In the end, the aircraft was given the less controversial name "Phantom II", the first "Phantom" being another McDonnell jet fighter, the FH-1 Phantom. The Phantom II was briefly given the designation F-110A and named "Spectre" by the USAF and the Tri-Service aircraft designation system, F-4, was adopted in September 1962.
Production
Early in production, the radar was upgraded to the Westinghouse AN/APQ-72, an AN/APQ-50 with a larger radar antenna, necessitating the bulbous nose, and the canopy was reworked to improve visibility and make the rear cockpit less claustrophobic. During its career the Phantom underwent many changes in the form of numerous variants developed.The USN operated the F4H-1 with J79-GE-2 and -2A engines of 16,100 lbf thrust and later builds receiving -8 engines. A total of 45 F-4As were built; none saw combat, and most ended up as test or training aircraft. The USN and USMC received the first definitive Phantom, the F-4B which was equipped with the Westinghouse APQ-72 radar, a Texas Instruments AN/AAA-4 Infrared search and track pod under the nose, an AN/AJB-3 bombing system and powered by J79-GE-8,-8A and -8B engines of 10,900 lbf dry and 16,950 lbf afterburner with the first flight on 25 March 1961. 649 F-4Bs were built with deliveries beginning in 1961 and VF-121 Pacemakers receiving the first examples at NAS Miramar.
The USAF received Phantoms as the result of Defense Secretary Robert McNamara's push to create a unified fighter for all branches of the US military. After an F-4B won the "Operation Highspeed" fly-off against the Convair F-106 Delta Dart, the USAF borrowed two Naval F-4Bs, temporarily designating them F-110A in January 1962, and developed requirements for their own version. Unlike the US Navy's focus on air-to-air interception in the Fleet Air Defense mission, the USAF emphasized both an air-to-air and an air-to-ground fighter-bomber role. With McNamara's unification of designations on 18 September 1962, the Phantom became the F-4 with the naval version designated F-4B and USAF F-4C. The first Air Force Phantom flew on 27 May 1963, exceeding Mach 2 on its maiden flight.
The F-4J improved both air-to-air and ground-attack capability; deliveries begun in 1966 and ended in 1972 with 522 built. It was equipped with J79-GE-10 engines with 17,844 lbf thrust, the Westinghouse AN/AWG-10 Fire Control System, a new integrated missile control system and the AN/AJB-7 bombing system for expanded ground attack capability.
The F-4N with smokeless engines and F-4J aerodynamic improvements started in 1972 under a U.S. Navy-initiated refurbishment program called "Project Bee Line" with 228 converted by 1978. The F-4S model resulted from the refurbishment of 265 F-4Js with J79-GE-17 smokeless engines of 17,900 lbf, AWG-10B radar with digitized circuitry for improved performance and reliability, Honeywell AN/AVG-8 Visual Target Acquisition Set or VTAS, classified avionics improvements, airframe reinforcement and leading edge slats for enhanced maneuvering. The USMC also operated the RF-4B with reconnaissance cameras with 46 built; the RF-4B flew alone and unarmed, with a requirement to fly straight and level at 5,000 feet while taking photographs. They relied on the shortcomings of the anti-aircraft defenses to survive as they were unable to make evasive maneuvers.
Phantom II production ended in the United States in 1979 after 5,195 had been built. Of these, 2,874 went to the USAF, 1,264 to the Navy and Marine Corps, and the rest to foreign customers. The last U.S.-built F-4 went to South Korea, while the last F-4 built was an F-4EJ built by Mitsubishi Heavy Industries in Japan and delivered on 20 May 1981. As of 2008, 631 Phantoms were in service worldwide, while the Phantoms were in use as a target drone operated by the U.S. military until 21 December 2016, when the Air Force officially ended use of the type.