F4 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 originally developed by McDonnell Aircraft for the United States Navy.Swanborough and Bowers 1976, p. 301. Proving highly adaptable, it entered service with the Navy in 1961 before it was adopted by the United States Marine Corps and the United States Air Force, and by the mid-1960s it had become a major part of their air arms. Phantom production ran from 1958 to 1981 with a total of 5,195 aircraft built, making it the most produced American supersonic military aircraft in history, and cementing its position as an iconic combat aircraft of the Cold War."F-4 Phantoms Phabulous 40th"
Boeing. Retrieved : 27 November 2012..

The Phantom is a large fighter with a top speed of over Mach 2.2. It can carry more than 18,000 pounds (8,400 kg) of weapons on nine external hardpoints, including air-to-air missiles, air-to-ground missiles, and various bombs. The F-4, like other interceptors of its time, was initially designed without an internal cannon. Later models incorporated an 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. It served as the principal air superiority fighter for the U.S. Air Force, Navy, and Marine Corps and became important in the ground-attack and aerial reconnaissance roles late in the war. During the Vietnam War, one U.S. Air Force pilot, two weapon systems officers (WSOs), one U.S. Navy pilot and one radar intercept officer (RIO) became aces by achieving five aerial kills against enemy fighter aircraft. The F-4 continued to form a major part of U.S. military air power throughout the 1970s and 1980s, being 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 F-4 Phantom II remained in use by the U.S. in the reconnaissance and Wild Weasel ( Suppression of Enemy Air Defenses) roles in the 1991 Gulf War, finally leaving service in 1996.Donald Spring 1991, p. 26.Donald Summer 1991, p. 22. It was also the only aircraft used by both U.S. flight demonstration teams: the United States Air Force Thunderbirds (F-4E) and the United States Navy Blue Angels (F-4J).Lake 1992, p. 190. The F-4 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. As of 2021, 63 years after its first flight, the F-4 remains in active service with the air forces of Iran, South Korea, Greece, and Turkey. The aircraft has most recently been in service against the Islamic State group in the Middle East.

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,Dorr 2008, p. 61. and variants powered by two Wright J65 engines, or two General Electric J79 engines."Phabulous 40th: Phantom Development."
''1978 Commemorative Book''. Boeing. Retrieved: 14 February 2008. 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 (.79 in) 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 (71.8 kN) 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".Donald and Lake 2002, pp. 6, 8. 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, but these were not officially used 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/APG-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 (re-designated F-4A in 1962) with J79-GE-2 and -2A engines of 16,100 lbf (71.62 kN) 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.Eden 2004, p. 278. The USN and USMC received the first definitive Phantom, the F-4B which was equipped with the Westinghouse APQ-72 radar (pulse only), a Texas Instruments 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 (48.5 kN) dry and 16,950 lbf (75.4 kN) afterburner (reheat) 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 (FAD) 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.Knaack 1978, p. 266.

The F-4J improved both air-to-air and ground-attack capability; deliveries begun in 1966 and ended in 1972 with 522 built.Gunston 1979, p.246. It was equipped with J79-GE-10 engines with 17,844 lbf (79.374 kN) thrust, the Westinghouse AN/AWG-10 Fire Control System (making the F-4J the first fighter in the world with operational look-down/shoot-down capability), a new integrated missile control system and the AN/AJB-7 bombing system for expanded ground attack capability.

The F-4N (updated F-4Bs) 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 (79.379 kN), AWG-10B radar with digitized circuitry for improved performance and reliability, Honeywell AN/AVG-8 Visual Target Acquisition Set or VTAS (world's first operational Helmet Sighting System), classified avionics improvements, airframe reinforcement and leading edge slats for enhanced maneuvering.Gunston 1981, p. 233. The USMC also operated the RF-4B with reconnaissance cameras with 46 built;Dorr 1987, p. 39. 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 maneuveres.

Phantom II production ended in the United States in 1979 after 5,195 had been built (5,057 by McDonnell Douglas and 138 in Japan by Mitsubishi). 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,"Directory: World Air Forces".
''Flight International'', 11–17 November 2008, pp. 52–76. while the Phantoms were in use as a target drone (specifically QF-4Cs) operated by the U.S. military until 21 December 2016, when the Air Force officially ended use of the type.

World records

To show off their new fighter, the Navy led a series of record-breaking flights early in Phantom development: All in all, the Phantom set 16 world records. Five of the speed records remained unbeaten until the F-15 Eagle appeared in 1975.
* Operation Top Flight: On 6 December 1959, the second XF4H-1 performed a zoom climb to a world record 98,557 ft (30,040 m)."This day in aviation: 6 December 1959"
''Bryan R. Swopes''. Retrieved: 25 April 2014. Commander Lawrence E. Flint Jr., USN accelerated his aircraft to at 47,000 ft (14,330 m) and climbed to 90,000 ft (27,430 m) at a 45° angle. He then shut down the engines and glided to the peak altitude. As the aircraft fell through 70,000 ft (21,300 m), Flint restarted the engines and resumed normal flight.
* On 5 September 1960, an F4H-1 averaged 1,216.78 mph (1,958.16 km/h) over a 500 km (311 mi) closed-circuit course.
* On 25 September 1960, an F4H-1F averaged 1,390.24 mph (2,237.37 km/h) over a 100 km (62.1 mi) closed-circuit course. FAIRecord File Number 8898.
* Operation LANA: To celebrate the 50th anniversary of Naval aviation (L is the Roman numeral for 50 and ANA stood for Anniversary of Naval Aviation) on 24 May 1961, Phantoms flew across the continental United States in under three hours and included several tanker refuelings. The fastest of the aircraft averaged 869.74 mph (1,400.28 km/h) and completed the trip in 2 hours 47 minutes, earning the pilot (and future NASA Astronaut), Lieutenant Richard Gordon, USN and RIO, Lieutenant Bobbie Young, USN, the 1961 Bendix trophy.
* Operation Sageburner: On 28 August 1961, a F4H-1F Phantom II averaged 1,452.777 kilometers per hour (902.714 miles per hour) over a 3 mi (4.82 km) course flying below at all times. Commander J.L. Felsman, USN was killed during the first attempt at this record on 18 May 1961 when his aircraft disintegrated in the air after pitch damper failure.
* Operation Skyburner: On 22 November 1961, a modified Phantom with water injection, piloted by Lt. Col. Robert B. Robinson, set an absolute world record average speed over a 20-mile (32.2 km) long 2-way straight course of 1,606.342 mph (2,585.086 km/h).
* On 5 December 1961, another Phantom set a sustained altitude record of .
* Project High Jump: A series of time-to-altitude records was set in early 1962: 34.523 seconds to , 48.787 seconds to , 61.629 seconds to , 77.156 seconds to , 114.548 seconds to , 178.5 s to , 230.44 s to , and 371.43 s to . All High Jump records were set by F4H-1 production number 108 (Bureau Number 148423). Two of the records were set by future distinguished NASA astronaut LCdr John Young.

Design

Overview

The F-4 Phantom is a tandem-seat fighter-bomber designed as a carrier-based interceptor to fill the U.S. Navy's fleet defense fighter role. Innovations in the F-4 included an advanced pulse-Doppler radar and extensive use of titanium in its airframe.

Despite imposing dimensions and a maximum takeoff weight of over 60,000 lb (27,000 kg),Donald and Lake 1996, p. 268. the F-4 has a top speed of Mach 2.23 and an initial climb rate of over 41,000 ft/min (210 m/s).Dorr and Donald 1990, p. 198. The F-4's nine external hardpoints have a capability of up to 18,650 pounds (8,480 kg) of weapons, including air-to-air and air-to-surface missiles, and unguided, guided, and thermonuclear weapons.McDonnell Douglas F-4D "Phantom II".
''National Museum of the USAF''. Retrieved: 20 January 2008. Like other interceptors of its day, the F-4 was designed without an internal cannon.

The baseline performance of a Mach 2-class fighter with long-range and a bomber-sized payload would be the template for the next generation of large and light/middle-weight fighters optimized for daylight air combat.

Flight characteristics

"Speed is life" was F-4 pilots' slogan, as the Phantom's greatest advantage in air combat was acceleration and thrust, which permitted a skilled pilot to engage and disengage from the fight at will. MiGs usually could outturn the F-4 because of the high drag on the Phantoms airframe;Goebel, Greg
"Phantom Over Southeast Asia."
''Vectorsite.net''. Retrieved: 18 January 2008. as a massive fighter aircraft designed to fire radar-guided missiles from beyond visual range, the F-4 lacked the agility of its Soviet opponents and was subject to adverse yaw during hard maneuvering. Although the F-4 was subject to irrecoverable spins during aileron rolls, pilots reported the aircraft to be very responsive and easy to fly on the edge of its performance envelope. In 1972, the F-4E model was upgraded with leading edge slats on the wing, greatly improving high angle of attack maneuverability at the expense of top speed.

The J79 had a reduced time lag between the pilot advancing the throttle, from idle to maximum thrust, and the engine producing maximum thrust compared to earlier engines. While landing on John Chesire's tailhook missed the arresting gear as he (mistakenly) reduced thrust to idle. He then slammed the throttle to full afterburner, the engine's response time being enough to return to full thrust quickly, and he was able get the Phantom airborne again successfully ( bolter). The J79 produced noticeable amounts of black smoke (at mid-throttle/cruise settings), a severe disadvantage in that it made it easier for the enemy to spot the aircraft. Two decades after the aircraft entered service this was solved on the F-4S, which was fitted with the −10A engine variant with a smokeless combustor.

The lack of an internal gun "was the biggest mistake on the F-4", Chesire said; "Bullets are cheap and tend to go where you aim them. I needed a gun, and I really wished I had one." Marine Corps General John R. Dailey recalled that "everyone in RF-4s wished they had a gun on the aircraft." For a brief period, doctrine held that turning combat would be impossible at supersonic speeds and little effort was made to teach pilots air combat maneuvering. In reality, engagements quickly became subsonic, as pilots would slow down in an effort to get behind their adversaries. Furthermore, the relatively new heat-seeking and radar-guided missiles at the time were frequently reported as unreliable and pilots had to fire multiple missiles just to hit one enemy fighter. To compound the problem, rules of engagement in Vietnam precluded long-range missile attacks in most instances, as visual identification was normally required. Many pilots found themselves on the tail of an enemy aircraft, but too close to fire short-range Falcons or Sidewinders. Although by 1965 USAF F-4Cs began carrying SUU-16 external gunpods containing a 20 mm (.79 in) M61A1 Vulcan Gatling cannon, USAF cockpits were not equipped with lead-computing gunsights until the introduction of the SUU-23, virtually assuring a miss in a maneuvering fight. Some Marine Corps aircraft carried two pods for strafing. In addition to the loss of performance due to drag, combat showed the externally mounted cannon to be inaccurate unless frequently boresighted, yet far more cost-effective than missiles. The lack of a cannon was finally addressed by adding an internally mounted 20 mm (.79 in) M61A1 Vulcan on the F-4E.Higham and Williams 1978.

Costs

Note: Original amounts were in 1965 U.S. dollars.Knaack 1978 The figures in these tables have been adjusted for inflation to the current year.

Operational history

United States Air Force

In USAF service, the F-4 was initially designated the F-110A"Fact sheet discussing the F-110."
''National Museum of the U.S. Air Force''. Retrieved: 26 May 2008. prior to the introduction of the 1962 United States Tri-Service aircraft designation system. The USAF quickly embraced the design and became the largest Phantom user. The first USAF Phantoms in Vietnam were F-4Cs from the 43rd Tactical Fighter Squadron arrived in December 1964.Dorr and Bishop 1996, p. 37.

Unlike the U.S. Navy and U.S. Marine Corps, which flew the Phantom with a Naval Aviator (pilot) in the front seat and a Naval Flight Officer as a radar intercept officer (RIO) in the back seat, the USAF initially flew its Phantoms with a rated Air Force Pilot in front and back seats. Pilots usually did not like flying in the back seat; while the GIB, or "guy in back", could fly and ostensibly land the aircraft, he had fewer flight instruments and a very restricted forward view. The Air Force later assigned a rated Air Force Navigator qualified as a weapon/targeting systems officer (later designated as weapon systems officer or WSO) in the rear seat instead of another pilot.

On 10 July 1965, F-4Cs of the 45th Tactical Fighter Squadron, 15th TFW, on temporary assignment in Ubon, Thailand,Dorr and Bishop 1996, p. 38. scored the USAF's first victories against North Vietnamese MiG-17s using AIM-9 Sidewinder air-to-air missiles.Dorr and Bishop 1996, pp. 48–49. On 26 April 1966, an F-4C from the 480th Tactical Fighter Squadron scored the first aerial victory by a U.S. aircrew ove