AIM-4 Falcon

AIM-4 Falcon
A pair of AIM-4D Falcons in the weapons bay of the F-102 Delta Dagger fighter
Place of origin	United States
Specifications
Length	1.98 m (6 ft 6 in)
Diameter	163 mm (6.4 in)
Warhead	3.4 kg (7.5 lb)

Wingspan	508 mm (20.0 in)
Propellant	solid fuel rocket
Operational range	9.7 km (6.0 mi)
Speed	Mach 3
Guidance system	semi-active radar homing and Tail-chase engagement infrared homing

The Hughes AIM-4 Falcon was the first operational guided air-to-air missile of the United States Air Force. Development began in 1946; the weapon was first tested in 1949. The missile entered service with the USAF in 1956.

Produced in both heat-seeking and radar-guided versions, the missile served during the Vietnam War with USAF McDonnell Douglas F-4 Phantom II units. Designed to shoot down slow bombers with limited maneuverability, it was ineffective against maneuverable fighters over Vietnam. Lacking proximity fusing, the missile would only detonate if a direct hit was scored. Only five kills were recorded.

With the AIM-4's poor kill record rendering the F-4 ineffective at air-to-air combat, the fighters were modified to carry the USN-designed AIM-9 Sidewinder missile instead, which was already carried on USN and USMC F-4 Phantom II and F-8 Crusader jet fighters. The Sidewinder was much more effective and continues to serve the armed forces of the United States and numerous allied nations to this day.

Development

Development of a guided air-to-air missile began in 1946. Hughes Aircraft was awarded a contract for a subsonic missile under the project designation MX-798, which soon gave way to the supersonic MX-904 in 1947. The original purpose of the weapon was as a self-defense weapon for bomber aircraft, but after 1950 it was decided that it should arm fighter aircraft instead, particularly in the interception role.

The first test firings took place in 1949, at which time it was designated AAM-A-2 and given the popular name Falcon. A brief policy of awarding fighter and bomber designations to missiles led it to be redesignated F-98 in 1951. In 1955, the policy changed again, and the missile was again redesignated GAR-1.

The initial GAR-1 and GAR-2 models entered service in 1956.^[1] It armed the Northrop F-89 Scorpion, McDonnell F-101B Voodoo and Convair F-102 Delta Dagger and F-106 Delta Dart interceptors. The only other users were Canada, Finland, Sweden and Switzerland, whose CF-101 Voodoo, Saab 35 Draken and Dassault Mirage IIIS carried the AIM-4 Falcon. Canada also hoped to use them on the Avro CF-105 Arrow interceptor; however, this was never realized because of the Arrow's cancellation.

Fighters carrying the Falcon were often designed with internal weapons bays for carrying this missile. The Scorpion carried them on wingtip pods, while the Delta Dagger and Delta Dart had belly bays with a trapeze mechanism to move them into the airstream for launch (see picture above). The F-101B had an unusual bay arrangement where two were stored externally, and then the bay door would rotate to expose two more missiles. It is likely the F-111 Aardvark's internal bay would have accommodated the missile as well, but by the time of service, the Air Force had already dropped the Falcon for use against fighters, as well as the idea of using the F-111 as an air combat fighter.

The GAR-1 had semi-active radar homing (SARH), giving a range of about 5 mi (8.0 km). About 4,000 missiles were produced. It was replaced in production by the GAR-1D (later AIM-4A), with larger control surfaces. About 12,000 of this variant were produced, the major production version of the SARH Falcon.

The GAR-2 (later AIM-4B) was a heat-seeker, generally limited to rear-aspect engagements, but with the advantage of being a 'fire and forget' weapon. As would also be Soviet practice, it was common to fire the weapon in salvos of both types to increase the chances of a hit (a heat-seeking missile fired first, followed moments later by a radar-guided missile). The GAR-2 was about 1.5 in (40 mm) longer and 16 lb (7 kg) heavier than its SARH counterpart. Its range was similar. It was replaced in production by the GAR-2A (laterd AIM-4C), with a more sensitive infrared seeker. A total of about 26,000 of the infrared-homing Falcons were built.

119th Fighter Wing weapons handlers with an AIM-4C, 1972.

AIM-9B and J next to HM-55 and HM-58
All used by the SwAF

All of the early Falcons had a small 7.6 lb (3.4 kg) warhead, limiting their lethal radius. Also limiting them tactically was the fact that Falcon lacked a proximity fuze: the fuzing for the missile was in the leading edges of the wings, requiring a direct hit to detonate.

In 1958, Hughes introduced a slightly enlarged version of the Falcon, initially dubbed Super Falcon, with a more powerful, longer-burning rocket engine, increasing speed and range. It had a larger warhead (28.7 lb / 13 kg) and better guidance systems. The SARH versions were GAR-3 (AIM-4E) and the improved GAR-3A (AIM-4F). The infrared version was the GAR-4A (AIM-4G). About 2,700 SARH missiles and 3,400 IR Super Falcons were produced, replacing most earlier versions of the weapon in service.

The Falcon was redesignated AIM-4 in September 1962.

The final version of the original Falcon was the GAR-2B (later AIM-4D), which entered service in 1963. This was intended as a fighter combat weapon, combining the lighter, smaller airframe of the earlier GAR-1/GAR-2 weapon with the improved IR seeker of the GAR-4A/AIM-4G.

A larger version of the Falcon carrying a 0.25-kiloton nuclear warhead was developed as the GAR-11 (later designated the AIM-26 Falcon), while a long-range version was developed for the North American XF-108 Rapier and Lockheed YF-12 interceptors as the GAR-9 (later AIM-47 Falcon).

Operational history

The Air Force deployed AIM-4 in May 1967 during the Vietnam War on the new F-4D Phantom II, which carried it on the inner wing pylons and was not wired to carry the AIM-9 Sidewinder. The missile's combat performance was very poor. The Falcon, already operational on Air Defense Command aircraft, was designed to be used against bombers, and its slow seeker cooling times (as much as six or seven seconds to obtain a lock on a target) rendered it largely ineffective against maneuvering fighters. Moreover, it could only be cooled once. Limited coolant supply meant that once cooled, the missile would expend its supply of liquid nitrogen in two minutes, rendering it useless on the rail. The missile also had a small warhead, and lacked proximity fusing. As a result, only five kills were scored, all with the AIM-4D version.^[2] (The Falcon was also experimentally fired by the F-102 Delta Dagger against ground targets at night using its infrared seeker.)

A New Jersey ANG F-106A launching an AIM-4, 1984.

The weapon was unpopular with pilots from the onset and was supplemented or partially withdrawn in 1969, to be replaced in the F-4D by the Sidewinder after retrofitting the proper wiring. Colonel Robin Olds, USAF, commanding the F-4D-equipped 8th Tactical Fighter Wing, was an outspoken critic of the missile and said of it:

By the beginning of June, we all hated the new AIM-4 Falcon missiles. I loathed the damned useless things. I wanted my Sidewinders back. In two missions I had fired seven or eight of the bloody things and not one guided. They were worse than I had anticipated. Sometimes they refused to launch; sometimes they just cruised off into the blue without guiding. In the thick of an engagement with my head twisting and turning, trying to keep track of friend and foe, I'd forget which of the four I had (already) selected and couldn't tell which of the remaining was perking and which head was already expiring on its launch rail. Twice upon returning to base I had the tech rep go over the switchology and firing sequences. We never discovered I was doing anything wrong.^[3]

Colonel Olds became exasperated with the Falcon's poor combat performance. He ordered his entire fighter wing to rewire the F-4Ds to carry more reliable AIM-9 Sidewinders. Although it was an unauthorized field modification, the entire air force eventually followed his example. An effort to address the limitations of AIM-4D led to the development in 1970 of the XAIM-4H, which had a laser proximity fuze, new warhead, and better maneuverability. It was cancelled the following year without entering service.

Vietnam War: U.S. AIM-4 Falcon Air to Air Victories

Used from 1965 through 1972 in Vietnam, Falcons achieved their only kills during Operation Rolling Thunder (1965–68) during which time only 5 successful hits were scored from 54 launchings during aerial combat.^[4]^[5]
Date	Missile Firing Aircraft	AIM-4 Falcon Model	Downed Aircraft	Operating Unit
26 Oct 1967	F-4D Phantom II	AIM-4D	MiG-17	USAF 555th Tactical Fighter Squadron (TFS)
17 Dec 1967	F-4D	AIM-4D	MiG-17	13th TFS
03 Jan 1968	F-4D	AIM-4D	MiG-17	435th TFS
18 Jan 1968	F-4D	AIM-4D	MiG-17	435th TFS
05 Feb 1968	F-4D	AIM-4D	MiG-21	13th TFS

The AIM-4F/AIM-4G Super Falcon remained in USAF and ANG service, primarily with Convair F-102 Delta Dagger and F-106 Delta Dart interceptors, until the final retirement of the F-106 in 1988.

The AIM-4C was also produced as the HM-58 for the Swiss Air Force for use on the Dassault Mirage IIIS, and license-manufactured in Sweden for the Swedish Air Force (as the Rb 28) to equip the Saab 35 Draken and 37 Viggen. The seeker of the missile was also re-designed.

Operators

Map with former AIM-4 operators in red

Former operators

Canada

Finland

Finnish Air Force – (Swedish built missiles)

Sweden

Swedish Air Force – (Licence built by SAAB)

Switzerland

Swiss Air Force

United States

United States Air Force

Greece

Hellenic Air Force

Turkey

Turkish Air Force

Specifications (GAR-1D/ -2B / AIM-4C/D)

Length: 78 in (2.0 m) / 79.5 in (2.02 m)
Wingspan: 20 in (510 mm)
Diameter: 6.4 in (160 mm)
Weight: 119 lb (54 kg) / 135 lb (61 kg)
Speed: Mach 3
Range 6 mi (9.7 km)
Guidance: semi-active radar homing / rear-aspect infrared homing
Warhead: 7.6 lb (3.4 kg) high explosive

References

Notes

↑ Cyprus Riots, 1956/05/31 (1956). Universal Newsreel. 1956. Retrieved February 22, 2012.
↑ Davies, Peter E: "USAF F-4 Phantom II MiG Killers 1965-68", page 86. Osprey Publishing, 2004
↑ Olds, Robin. (2010) Fighter Pilot: The Memoirs of Legendary Ace Robin Olds , St. Martin's Press, ISBN 978-0-312-56023-2, p. 314.
↑ McCarthy Jr. p. 152, 153
↑ Michel III p. 156

Bibliography

The history of the Falcon missile, and its various configurations, is examined in Gart, Jason H. "Electronics and Aerospace Industry in Cold War Arizona, 1945-1968: Motorola, Hughes Aircraft, Goodyear Aircraft." Phd diss., Arizona State University, 2006.
Leighton, David, ""The History of the Hughes Missile Plant in Tucson, 1947-1960," Private Publication, 2015
McCarthy Jr. Donald J. MiG Killers, A Chronology of U.S. Air Victories in Vietnam 1965-1973. 2009, Specialty Press. ISBN 978-1-58007-136-9.
Michel III, Marshall L. Clashes, Air Combat Over North Vietnam 1965-1972. 1997, Naval Institute Press. ISBN 978-1-59114-519-6.

1962 United States Tri-Service missile and drone designation system

1–50	MGM-1 RIM-2 MIM-3 AIM-4 MGM-5 RGM-6 AIM-7/RIM-7 RIM-8 AIM-9 CIM-10 PGM-11 AGM-12 CGM-13/MGM-13 MIM-14 RGM-15 CGM-16 PGM-17 MGM-18 PGM-19 ADM-20 MGM-21 AGM-22 MIM-23 RIM-24 HGM-25A/LGM-25C AIM-26 UGM-27 AGM-28 MGM-29 LGM-30 MGM-31 MGM-32 MQM-33 AQM-34 AQM-35 MQM-36 AQM-37 AQM-38 MQM-39 MQM-40 AQM-41 MQM-42 FIM-43 UUM-44 AGM-45 MIM-46 AIM-47 AGM-48 LIM-49 RIM-50

51–100	MGM-51 MGM-52 AGM-53 AIM-54 RIM-55 PQM-56 MQM-57 MQM-58 RGM-59 AQM-60 MQM-61 AGM-62 AGM-63 AGM-64 AGM-65 RIM-66 RIM-67 AIM-68 AGM-69 LEM-70 BGM-71 MIM-72 UGM-73 BQM-74 BGM-75 AGM-76 FGM-77 AGM-78 AGM-79 AGM-80 AQM-81 AIM-82 AGM-83 AGM-84/RGM-84/UGM-84 AGM-84E AGM-84E/H/K RIM-85 AGM-86 AGM-87 AGM-88 UGM-89 BQM-90 AQM-91 FIM-92/AIM-92 XQM-93 YQM-94 AIM-95 UGM-96 AIM-97 YQM-98 LIM-99 LIM-100

101–150	RIM-101 PQM-102 AQM-103 MIM-104 MQM-105 BQM-106 MQM-107 BQM-108 BGM-109/AGM-109/RGM-109/UGM-109 BGM-110 BQM-111 AGM-112 RIM-113 AGM-114 MIM-115 RIM-116 FQM-117 LGM-118 AGM-119 AIM-120 CQM-121/CGM-121 AGM-122 AGM-123 AGM-124 RUM-125/UUM-125 BQM-126 AQM-127 AQM-128 AGM-129 AGM-130 AGM-131 AIM-132 UGM-133 MGM-134 ASM-135 AGM-136 AGM-137 CEM-138 RUM-139 MGM-140 ADM-141 AGM-142 MQM-143 ADM-144 BQM-145 MIM-146 BQM-147 FGM-148 PQM-149 PQM-150

151–	FQM-151 AIM-152 AGM-153 AGM-154 BQM-155 RIM-156 MGM-157 AGM-158A/B/AGM-158C AGM-159 ADM-160 RIM-161 RIM-162 GQM-163 MGM-164 RGM-165 MGM-166 BQM-167 MGM-168 AGM-169 MQM-170 MQM-171 FGM-172 GQM-173 RIM-174 MQM-175 AGM-176 BQM-177 MQM-178

Undesignated	ASALM Brazo Have Dash MA-31 NLOS Pershing II Senior Prom Sprint Wagtail

See also: United States tri-service rocket designations post-1962

USAAS/USAAC/USAAF/USAF fighter designations 1924–1962

Pursuit (pre-1948) Fighter (post-1948)	P-1 P-2 P-3 XP-4 P-5 P-6 XP-7 XP-8 XP-9 XP-10 P-11 P-12 XP-13 XP-14 XP-15 P-16 P-17 YP-18 YP-19 YP-20 P-21 XP-22 P-23 YP-24 P-25 P-26 P-27 P-28 P-29 P-30 XP-31 P-32 P-33 XP-34 P-35 P-36 P-37 P-38 P-39 P-40 XP-41 P-42 P-43 P-44 P-45 XP-46 P-47 XP-48 XP-49 XP-50 P-51 XP-52 P-53 XP-54 XP-55 XP-56 XP-57 XP-58 P-59 P-60 P-61/C XP-62 P-63 P-64 P-65 P-66 XP-67 XP-68 P-69 P-70 XP-71 XP-72 P-73 P-74¹ P-75 XP-76 XP-77 P-78 XP-79 P-80 XP-81 P-82 XP-83 P-84 XP-85 P-86/D XP-87 P-88 P-89 XF-90 XF-91 XF-92 YF-93 F-94 F-95 F-96 F-97 F-98 F-99 F-100 F-101 F-102 XF-103 F-104 F-105 F-106 F-107 XF-108 XF-109 F-110 F-111/B

Pursuit, Biplace	PB-1 PB-2 PB-3

Fighter, Multiplace	FM-1 FM-2

¹ Not assigned See also: F-24 • F-117 • P-400 • post-1962 sequence

1955–1962 United States Air Force rocket and missile designations

Air-to-air missiles

1955–1961 sequence	MB-1 GAR-1 GAR-2 GAR-3 GAR-4 GAR-5 GAR-6 GAR-8 GAR-9 GAR-11

1961–1962 sequence	AIM-101

Other types

Undesignated types

See also: USAF missile designations 1947–51
United States tri-service missile and drone designations post-1962

1947–1951 United States Air Force rocket and missile designations

Air-launched

Air-to-air	AAM-A-1 AAM-A-2

Air-to-surface	ASM-A-1 ASM-A-2

Ground-launched

Surface-to-air	SAM-A-1

Surface-to-surface	SSM-A-1 SSM-A-2 SSM-A-3 SSM-A-4 SSM-A-5 SSM-A-6

Test vehicles

Launch test	LTV-A-1

Propulsion test	PTV-A-1

Rocket test	RTV-A-1 RTV-A-2 RTV-A-3 RTV-A-4 RTV-A-5

Types of missile

By platform	Air-launched ballistic missile (ALBM) Air-to-air missile (AAM) Air-to-surface missile (ASM) Ballistic missile Cruise missile Intercontinental ballistic missile (ICBM) Intermediate-range ballistic missile (IRBM) Shoulder-fired missile Submarine-launched ballistic missile (SLBM) Submarine-launched cruise missile (SLCM) Surface-to-air missile (SAM) Surface-to-surface missile (SSM)

By target type	Anti-ballistic missile (ABM) Anti-satellite weapon (ASAT) Anti-ship ballistic missile (ASBM) Anti-ship missile (AShM) Anti-submarine missile Anti-tank missile (ATGM) Land-attack missile (LACM)

By guidance	Active radar guidance Semi-active radar guidance Passive homing Track-via-missile Anti-radiation Command to line-of-sight guidance Command off line-of-sight guidance Pursuit guidance Beam riding Infrared guidance Laser guidance Unguided rockets Wire guidance TERCOM DSMAC Inertial guidance Astro-inertial guidance Satellite guidance Compass

Lists	List of military rockets List of missiles List of missiles by country List of anti-ship missiles List of anti-tank missiles List of ICBMs List of surface-to-air missiles

See also: Sounding rocket

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