Mirage IV
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The Dassault Mirage IV is a French
supersonic Supersonic speed is the speed of an object that exceeds the speed of sound (Mach 1). For objects traveling in dry air of a temperature of 20 °C (68 °F) at sea level, this speed is approximately . Speeds greater than five times ...
strategic bomber A strategic bomber is a medium- to long-range Penetrator (aircraft), penetration bomber aircraft designed to drop large amounts of air-to-ground weaponry onto a distant target for the purposes of debilitating the enemy's capacity to wage war. Unl ...
and deep-
reconnaissance aircraft A reconnaissance aircraft (colloquially, a spy plane) is a military aircraft designed or adapted to perform aerial reconnaissance with roles including collection of imagery intelligence (including using Aerial photography, photography), signals ...
. Developed by
Dassault Aviation Dassault Aviation SA () is a French Aerospace manufacturer, manufacturer of military aircraft and business jets. It was founded in 1929 by Marcel Dassault, Marcel Bloch as Société des Avions Marcel Bloch (Marcel Bloch Aircraft Company). After ...
, the aircraft entered service with the
French Air Force The French Air and Space Force (, , ) is the air force, air and space force of the French Armed Forces. Formed in 1909 as the ("Aeronautical Service"), a service arm of the French Army, it became an independent military branch in 1934 as the Fr ...
in October 1964. For many years it was a vital part of the
nuclear triad A nuclear triad is a three-pronged military force structure of land-based intercontinental ballistic missiles (ICBMs), submarine-launched ballistic missiles (SLBMs), and strategic bombers with Nuclear weapon, nuclear bombs and missiles. Countrie ...
of the ''
Force de Frappe The ''Force de dissuasion'' (), known as the ''Force de frappe'' ('Strike Force') prior to 1961,Gunston, Bill. Bombers of the West. New York: Charles Scribner's and Sons; 1973. p104 is the French nuclear deterrence force. The ''Force de dissua ...
'', France's
nuclear deterrent Nuclear strategy involves the development of doctrines and strategies for the production and use of nuclear weapons. As a sub-branch of military strategy, nuclear strategy attempts to match nuclear weapons as means to political ends. In addit ...
striking force. The Mirage IV was retired from the nuclear strike role in 1996, and the type was entirely retired from operational service in 2005. During the 1960s, there were plans to export the Mirage IV. In one proposal, Dassault would have entered a partnership with the
British Aircraft Corporation The British Aircraft Corporation (BAC) was a British aircraft manufacturer formed from the government-pressured merger of English Electric, English Electric Aviation Ltd., Vickers-Armstrongs, Vickers-Armstrongs (Aircraft), the Bristol Aeroplane ...
to jointly produce a Mirage IV variant for the
Royal Air Force The Royal Air Force (RAF) is the Air force, air and space force of the United Kingdom, British Overseas Territories and Crown Dependencies. It was formed towards the end of the World War I, First World War on 1 April 1918, on the merger of t ...
and potentially for other export customers, but this project did not come to fruition. The Mirage IV was ultimately not adopted by any other operators.


Development


Origins

During the 1950s, France embarked on an extensive military program to produce
nuclear weapon A nuclear weapon is an explosive device that derives its destructive force from nuclear reactions, either fission (fission or atomic bomb) or a combination of fission and fusion reactions (thermonuclear weapon), producing a nuclear exp ...
s; however, it was acknowledged that existing French aircraft were unsuitable for the task of delivering the weapons.Gunston and Gilchrist 1993, p. 195. Thus, the development of a
supersonic Supersonic speed is the speed of an object that exceeds the speed of sound (Mach 1). For objects traveling in dry air of a temperature of 20 °C (68 °F) at sea level, this speed is approximately . Speeds greater than five times ...
bomber designed to carry out the delivery mission started in
1956 Events January * January 1 – The Anglo-Egyptian Sudan, Anglo-Egyptian Condominium ends in Sudan after 57 years. * January 8 – Operation Auca: Five U.S. evangelical Christian Missionary, missionaries, Nate Saint, Roger Youderian, E ...
as a part of the wider development of France's independent
nuclear deterrent Nuclear strategy involves the development of doctrines and strategies for the production and use of nuclear weapons. As a sub-branch of military strategy, nuclear strategy attempts to match nuclear weapons as means to political ends. In addit ...
. In May 1956, the
Guy Mollet Guy Alcide Mollet (; 31 December 1905 – 3 October 1975) was a French politician. He led the socialist French Section of the Workers' International (SFIO) from 1946 to 1969 and was the French Prime Minister from 1956 to 1957. As Prime Ministe ...
government drew up a specification for an aerially-refuelable supersonic bomber capable of carrying a 3 tonne, 5.2-metre-long nuclear bomb 2,000 km (without aerial refuelling).Gunston 1973, p. 104. According to aviation authors
Bill Gunston Bill Gunston (1 March 1927 – 1 June 2013) was a British aviation and military author. He flew with Britain's Royal Air Force from 1945 to 1948, and after pilot training became a flying instructor. He spent most of his adult life doing researc ...
and Peter Gilchrist, the specification's inclusion of supersonic speed was "surprising" to many at the time.Gunston and Gilchrist 1993, p. 196. The final specifications, jointly defined by government authorities and
Dassault Groupe Industriel Marcel Dassault SAS (; also GIM Dassault or Dassault Group) is a French corporate group established in 1929 with the creation of Société des Avions Marcel Bloch (now Dassault Aviation) by Marcel Dassault, later led by his so ...
staff, were approved on 20 March 1957.
Sud Aviation Sud Aviation (, 'Southern Aviation') was a French state-owned aircraft manufacturer, originating in the merger of Sud-Est ( SNCASE, or ''Société nationale des constructions aéronautiques du sud-est'') and Sud-Ouest ( SNCASO or ''Société nat ...
and
Nord Aviation Nord-Aviation () was a state-owned French aircraft manufacturer. The bulk of its facilities were based on the site of Bourges airport, in the département of Cher, in central France. On 1 October 1954, Nord Aviation was created as a result of ...
both submitted competing proposals, both based on existing aircraft; Sud Aviation proposed the Super Vautour, a stretched Sud Aviation Vautour with thrust
SNECMA Safran Aircraft Engines, previously Snecma (''Société nationale d'études et de construction de moteurs d'aviation'') or Snecma Moteurs, is a French aerospace engine manufacturer headquartered in Courcouronnes and a subsidiary of Safran. It d ...
Atar Atar, Ahtra, Atash, Azar () or ''Dāštāɣni'',, s.v. ''agni-.'' is the Zoroastrian concept of holy fire, sometimes described in abstract terms as "burning and unburning fire" or "visible and invisible fire" (Mirza, 1987:389). It is conside ...
engines and a combat radius of at Mach 0.9. Dassault's proposal for what became the Mirage IV was chosen on the basis of lower cost and anticipated simpler development, being based upon a proposed early 1956 twin-engined night-fighter derived from the
Dassault Mirage III The Dassault Mirage III () is a family of single/dual-seat, single-engine, fighter aircraft developed and manufactured by French aircraft company Dassault Aviation. It was the first Western European combat aircraft to exceed Mach 2 in horizont ...
fighter and the unbuilt Mirage II interceptor. In April 1957, Dassault were informed that they had won the design competition. Dassault's resulting prototype, dubbed Mirage IV 01, looked a lot like the Mirage IIIA, even though it had double the wing surface, two engines instead of one, and twice the unladen weight. The Mirage IV also carried three times more internal fuel than the Mirage III. The aircraft's aerodynamic features were very similar to the III's but required an entirely new structure and layout. This prototype was long, had an wingspan, of wing area, and weighed approximately . It was considerably more advanced than the Mirage III, incorporating new features such as machined and chem-milled planks, tapered sheets, a small amount of titanium, and integral fuel tanks in many locations including the leading portion of the tailfin. The 01 was an experimental prototype built to explore and solve the problems stemming from prolonged supersonic flight. At the time, no aircraft had been designed to cruise at over Mach 1.8 for long periods of time and there were sizable technological and operational uncertainties. Weapon-related issues were another issue. Building the 01 in Dassault's
Saint-Cloud Saint-Cloud () is a French commune in the western suburbs of Paris, France, from the centre of Paris. Like other communes of Hauts-de-Seine such as Marnes-la-Coquette, Neuilly-sur-Seine and Vaucresson, Saint-Cloud is one of France's wealthie ...
plant near
Paris Paris () is the Capital city, capital and List of communes in France with over 20,000 inhabitants, largest city of France. With an estimated population of 2,048,472 residents in January 2025 in an area of more than , Paris is the List of ci ...
took 18 months. In late
1958 Events January * January 1 – The European Economic Community (EEC) comes into being. * January 3 – The West Indies Federation is formed. * January 4 ** Edmund Hillary's Commonwealth Trans-Antarctic Expedition completes the thir ...
, the aircraft was transferred to the Melun-Villaroche flight testing area for finishing touches and ground tests. On 17 June 1959, French General Roland Glavany, on a five-year leave from the
French Air Force The French Air and Space Force (, , ) is the air force, air and space force of the French Armed Forces. Formed in 1909 as the ("Aeronautical Service"), a service arm of the French Army, it became an independent military branch in 1934 as the Fr ...
since 1954, took the 01 for its maiden flight.Jackson 1987, p.165.Gunston 1973, p. 108. On 19 September 1960, René Bigand (replacing Glavany as test pilot) increased the world record for speed on a 1000-kilometre closed circuit to 1,822 km/h (1,132 mph) around Paris and the Melun base. Flight 138, on 23 September, corroborated the initial performance and pushed the record on a 500 km closed circuit to an average of 1,972 km/h (1,225 mph), flying between Mach 2.08 and Mach 2.14. The Mirage IV 01 prototype underwent minor modifications during testing in the autumn of 1959, most noticeably, the tail was enlarged (slight reduction in height, large increase in chord).


Production

In order to increase range, studies were made of a significantly larger Mirage IVB design, powered by two
Snecma Safran Aircraft Engines, previously Snecma (''Société nationale d'études et de construction de moteurs d'aviation'') or Snecma Moteurs, is a French aerospace engine manufacturer headquartered in Courcouronnes and a subsidiary of Safran. It d ...
license-built Pratt & Whitney J75 engines and having a wing area of 120 m² (1,290 sq ft) compared to 70 m² (750 sq ft) of the prototype IV, as well as a speed of Mach 2.4 and a gross weight of .Gunston 1973, p. 109. The ''Mirage IVB'' proposal had been instigated as a response to interest by de Gaulle in ensuring that two-way (including the aircraft's return to France) strike missions could be flown.Gunston and Gilchrist 1993, p. 197. However, development of the aircraft was ultimately cancelled in July 1959 due to the greater cost involved, a decision having been taken to rely upon aerial refueling instead also being a factor. With the Mirage IVB considered to be too expensive, the medium-sized Mirage IVA, slightly larger than the first prototype, was chosen for three more prototypes to be produced. This aircraft had a wing area of and weighed about Gunston 1973, p. 112. On 4 April 1960, a formal order for 50 production Mirage IVA aircraft was issued. The three prototype aircraft were built between 1961 and 1963, with first flights on 12 October 1961, 1 June 1962, and 23 January 1963. By 1962, the second prototype had conducted simulated nuclear bombing runs in the trials range at Colomb-Bechar in southern
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. The third prototype was equipped with the navigation/bombing systems and flight refuelling probe. The fourth prototype Mirage IVA-04 was essentially representative of the production aircraft that would follow. For production, various portions of the aircraft were subcontracted to Sud Aviation (wings and rear fuselage) and
Breguet Aviation The ''Société anonyme des ateliers d'aviation Louis Breguet'' (), also known as Breguet Aviation (), was a French aircraft manufacturer. The company was set up in 1911 by the aviation pioneer Louis Charles Breguet. Breguet Aviation was extreme ...
(tailfin), which was still a separate company from Dassault until 1967; Dassault manufactured the front fuselage and flight-control system internally. Manufacture of both the prototypes and subsequent production aircraft was often hindered by an explicit requirement that there would be no reliance upon foreign suppliers to maintain France's nuclear capabilities; due to this, the Mirage IV initially lacked an
inertial navigation system An inertial navigation system (INS; also inertial guidance system, inertial instrument) is a navigation device that uses motion sensors (accelerometers), rotation sensors (gyroscopes) and a computer to continuously calculate by dead reckoning th ...
as French industry could not yet produce this device.Gunston and Gilchrist 1993, p. 198. On 7 December
1963 Events January * January 1 – Bogle–Chandler case: Commonwealth Scientific and Industrial Research Organisation scientist Dr. Gilbert Bogle and Mrs. Margaret Chandler are found dead (presumed poisoned), in bushland near the Lane Cove ...
, the first production Mirage IVA performed its maiden flight.Jackson 1985, p.69. A series of 62 aircraft was built, and they entered service between
1964 Events January * January 1 – The Federation of Rhodesia and Nyasaland is dissolved. * January 5 – In the first meeting between leaders of the Roman Catholic and Orthodox churches since the fifteenth century, Pope Paul VI and Patria ...
and
1968 Events January–February * January 1968, January – The I'm Backing Britain, I'm Backing Britain campaign starts spontaneously. * January 5 – Prague Spring: Alexander Dubček is chosen as leader of the Communist Party of Cze ...
. Although Dassault had designed the Mirage IV for the low-level flight role right from the start,Gunston 1973, p. 117. the final batch of 12 aircraft ordered in November 1964 differed from the earlier aircraft in several areas, including the flight controls, avionics, and structural details, for the purpose of providing improved low-level performance. It had been planned for this batch to be powered by the newer Pratt & Whitney/SNECMA TF106
turbofan A turbofan or fanjet is a type of airbreathing jet engine that is widely used in aircraft engine, aircraft propulsion. The word "turbofan" is a combination of references to the preceding generation engine technology of the turbojet and the add ...
engine. The improvements featured upon the last 12 Mirage IVs were later retroactively applied to the whole fleet. In December 1963 Dassault proposed a Mirage IV-106 variant with 2 Snecma TF106 (license-built Pratt and Whitney) engines, an enlarged 105,000 gross-weight fuselage, terrain-avoidance radar, and armed with a proposed French version of the American Douglas GAM-87 Skybolt
air-launched ballistic missile An air-launched ballistic missile (ALBM) is a ballistic missile launched from an aircraft. An ALBM allows the launch aircraft to stand off at long distances from its target, keeping it well outside the range of defensive weapons like anti-aircr ...
. This version would have been very costly, and ultimately was not ordered.


Proposed export variants

In 1963, the Australian government sought a replacement for the
Royal Australian Air Force The Royal Australian Air Force (RAAF) is the principal Air force, aerial warfare force of Australia, a part of the Australian Defence Force (ADF) along with the Royal Australian Navy and the Australian Army. Constitutionally the Governor-Gener ...
fleet of
English Electric Canberra The English Electric Canberra is a British first-generation, jet-powered medium bomber. It was developed by English Electric during the mid- to late 1940s in response to a 1944 Air Ministry requirement for a successor to the wartime de Havilla ...
bombers, largely in response to the
Indonesian Air Force The Indonesian Air Force (, sometimes shortened as IDAF / IdAF) is the Air force, aerial branch of the Indonesian National Armed Forces. The Indonesian Air Force is headquartered in Jakarta, Indonesia, and is headed by the Chief of Staff of th ...
's purchase of missile-armed Tupolev Tu-16 bombers.Gunston 1973, p. 118. Dassault proposed a version of the Mirage IVA with
Rolls-Royce Avon The Rolls-Royce Avon was the first axial flow jet engine designed and produced by Rolls-Royce. Introduced in 1950, the engine went on to become one of their most successful post-World War II engine designs. It was used in a wide variety of ai ...
engines. Australian Air Marshall
Frederick Scherger Air Chief Marshal (Australia), Air Chief Marshal Sir Frederick Rudolph William Scherger, (18 May 190416 January 1984) was a senior commander in the Royal Australian Air Force (RAAF). He served as Chief of Air Force (Australia), Chi ...
seriously considered purchase of the IVA in 1961 because it was considered to be proven hardware already in service (in contrast to the BAC TSR-2 which was still in development), before settling on the General Dynamics F-111C. The IVA was one of five aircraft types that were short listed for the role, but the F-111C was eventually selected. In April 1965, the British
Government A government is the system or group of people governing an organized community, generally a State (polity), state. In the case of its broad associative definition, government normally consists of legislature, executive (government), execu ...
cancelled the TSR-2 reconnaissance-strike aircraft. However the operational requirement still existed, so in response, Hawker Siddeley offered the Buccaneer S.2, the Americans the
General Dynamics F-111K The General Dynamics F-111K was a planned variant of the General Dynamics F-111 Aardvark medium-range interdictor and fighter bomber, tactical strike aircraft by General Dynamics, to meet a Royal Air Force requirement for such an aircraft. The p ...
, while, in July 1965, Dassault and
British Aircraft Corporation The British Aircraft Corporation (BAC) was a British aircraft manufacturer formed from the government-pressured merger of English Electric, English Electric Aviation Ltd., Vickers-Armstrongs, Vickers-Armstrongs (Aircraft), the Bristol Aeroplane ...
(BAC) jointly proposed a modified Mirage IV. The Dassault/BAC aircraft, known as the Mirage IV* or Mirage IVS (S for Spey) would be re-engined with more powerful
Rolls-Royce Spey The Rolls-Royce Spey (company designations RB.163 and RB.168 and RB.183) is a low-bypass turbofan engine originally designed and manufactured by Rolls-Royce that has been in widespread service for over 40 years. A co-development version of the ...
turbofan engines with a total of , larger (fuselage depth increased by , had an approximately forward fuselage extension, and was to weigh ), and use avionics planned for the TSR-2, although BAC preferred the French Antilope radar. Although designed by Dassault, the production was to be carried out jointly between Dassault and its subcontractors (wing, mid-fuselage, and tail) and BAC (front and rear fuselage). The final assembly location was not determined before this proposal was rejected. The Mirage IV* was to carry a bombload of up to . The Mirage IV* was claimed to meet nearly every RAF requirement except for field length, and some claim it exceeded the F-111 slightly in speed and had at least equal range. The estimated cost was £2.321 million per airframe (for 50) or £2.067 million (for 110), less than the price of the F-111K.Gunston 1973, p. 122. However Air Ministry and RAF studies of the proposal identified further modifications to meet the RAF low-level performance requirements. These included airframe strengthening and revised cockpit glazing to improve visibility for both the pilot and crew member. There was also a significant shortfall in range, despite the lengthened fuselage.Withington 2020. BAC claimed that the British government evaluation into the Mirage IV* was "relatively superficial". RAF pilots who test-flew the Mirage IV were "favourably impressed" with its low-altitude handling. However, some British government officials, including
Parliament In modern politics and history, a parliament is a legislative body of government. Generally, a modern parliament has three functions: Representation (politics), representing the Election#Suffrage, electorate, making laws, and overseeing ...
members Julian Risdale and
Roy Jenkins Roy Harris Jenkins, Baron Jenkins of Hillhead (11 November 1920 – 5 January 2003) was a British politician and writer who served as the sixth President of the European Commission from 1977 to 1981. At various times a Member of Parliamen ...
, questioned the Mirage IV*'s capacity to operate from unprepared airstrips or to operate at low level, or claimed that the F-111 was a superior aircraft "in a class of its own". Air historian Bill Gunston notes that low-level Mirage IV missions had been planned since 1963 and Mirage IVs operated regularly at low level since 1965, and argues that the ability of a strategic bomber to operate from unprepared airstrips is historically unimportant. Ultimately, as much for strategic political reasons as for technical ones, the F-111K was preferred (only to be cancelled later in its turn) and the Spey-engined Mirage abandoned.Jackson 1987, pp. 170–171.Jackson 1985, pp. 72–73. BAC and Dassault had also hoped to sell the Mirage IV* to France and to export the Mirage IV* to various nations, such as
India India, officially the Republic of India, is a country in South Asia. It is the List of countries and dependencies by area, seventh-largest country by area; the List of countries by population (United Nations), most populous country since ...
, possibly
Israel Israel, officially the State of Israel, is a country in West Asia. It Borders of Israel, shares borders with Lebanon to the north, Syria to the north-east, Jordan to the east, Egypt to the south-west, and the Mediterranean Sea to the west. Isr ...
, and others; the lack of a British sale put an end to such possibilities. Some aviation journalists claim that the rejection of the Mirage IV* may have dampened French interest in joint Anglo-French cooperation.


Design

The Mirage IV shares design features and a visual resemblance to the Mirage III fighter, featuring a tailless
delta wing A delta wing is a wing shaped in the form of a triangle. It is named for its similarity in shape to the Greek uppercase letter delta (letter), delta (Δ). Although long studied, the delta wing did not find significant practical applications unti ...
and a single square-topped vertical fin. However, the wing is significantly thinner to allow better high-speed performance and has a thickness/chord ratio of only 3.8% at the root and 3.2% at the tip; this wing was the thinnest built in Europe at that time and one of the thinnest in the world. While being significantly smaller than an expensive medium bomber proposal for the role, the Mirage IV was roughly three times the weight of the preceding Mirage III. The Mirage IV is powered by two Snecma Atar turbojets, fed by two air intakes on either side of the fuselage that had intake half-cone shock diffusers, known as souris ("mice"), which were moved forward as speed increased to trim the inlet for the shock wave angle. It can reach high supersonic speeds: the aircraft is redlined at Mach 2.2 at altitude because of airframe temperature restrictions, although it is capable of higher speeds. While broadly similar to the model used on the Mirage III, the Atar engine had a greater airflow and an elevated overspeed limit from 8,400
rpm Revolutions per minute (abbreviated rpm, RPM, rev/min, r/min, or r⋅min−1) is a unit of rotational speed (or rotational frequency) for rotating machines. One revolution per minute is equivalent to hertz. Standards ISO 80000-3:2019 def ...
to 8,700 rpm for greater thrust during high altitude supersonic flight. While the first Mirage IV prototype was fitted with double-eyelid engine nozzles, production aircraft featured a complicated variable geometry nozzle that automatically varied in response to the descent rate and airspeed. The aircraft has 14,000 litres (3,700 gal (US)) of internal fuel, and its engines are quite thirsty, especially when the
afterburner An afterburner (or reheat in British English) is an additional combustion component used on some jet engines, mostly those on military supersonic aircraft. Its purpose is to increase thrust, usually for supersonic flight, takeoff, and combat ...
is active. Fuel was contained within integral tanks within the wings, as well as a double-skinned section of the fuselage between and outboard of the inlet ducts, underneath the ducts and engines, and forward of the main spar of the tail fin; this provided a total internal capacity of . A refueling probe is built into the nose; aerial refuelling was often necessary in operations as the Mirage IV only had the fuel capacity, even with external drop tanks, to reach the
Soviet Union The Union of Soviet Socialist Republics. (USSR), commonly known as the Soviet Union, was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 until Dissolution of the Soviet ...
's borders, thus refuelling was required to allow for a 'round trip'.Lake 2002, p. 407. In the event of nuclear war between the major powers, it was thought that there would be little point in having the fuel to return as the host air bases would have been destroyed; instead, surviving Mirage IVs would have diverted to land at bases in nearby neutral countries following the delivery of their ordnance. The two-man crew, pilot and navigator, were seated in tandem cockpits, each housed under separate clamshell canopies.''Tangible Mirage'' January 1962, p. 20. A bombing/navigation radar is housed within an oblique-facing
radome A radome (a portmanteau of "radar" and "dome") is a structural, weatherproof enclosure that protects a radar antenna (radio), antenna. The radome is constructed of material transparent to radio waves. Radomes protect the antenna from weathe ...
underneath the fuselage between the intakes and aft of the cockpit; much of the Mirage IV's onboard avionics systems, such as the radar communications, navigational instrumentation, and bombing equipment, were produced by
Thomson-CSF Thomson-CSF was a French company that specialized in the development and manufacture of electronics with a heavy focus upon the aerospace and defence sectors of the market. Thomson-CSF was formed in 1968 following the merger of Thomson-Hous ...
.''Tangible Mirage'' January 1962, p. 21. Other avionics elements were provided by Dassault itself and SFENA; one of the only major subsystems not of French origin onboard was the Marconi-built AD.2300
doppler radar A Doppler radar is a specialized radar that uses the Doppler effect to produce velocity data about objects at a distance. It does this by bouncing a microwave signal off a desired target and analyzing how the object's motion has altered the fre ...
.Gunston and Gilchrist 1993, p. 199. Free-falling munitions could also be aimed using a ventral blister-mounted
periscope A periscope is an instrument for observation over, around or through an object, obstacle or condition that prevents direct line-of-sight observation from an observer's current position. In its simplest form, it consists of an outer case with ...
from the navigator's position. The Mirage IV has two pylons under each wing, with the inboard pylons being normally used for large
drop tank In aviation, a drop tank (external tank, wing tank or belly tank) is used to describe auxiliary fuel tanks externally carried by aircraft. A drop tank is expendable and often capable of being jettisoned. External tanks are commonplace on modern ...
s of 2,500-litre (660 gal (US)) capacity. The outer pylons typically carried ECM and
chaff Chaff (; ) is dry, scale-like plant material such as the protective seed casings of cereal grains, the scale-like parts of flowers, or finely chopped straw. Chaff cannot be digested by humans, but it may be fed to livestock, ploughed into soil ...
/flare dispenser pods to supplement the internal jamming and countermeasures systems. On later aircraft, this equipment typically included a Barax NG jammer pod under the port wing and a BOZ expendables dispenser under the starboard wing. No
cannon A cannon is a large-caliber gun classified as a type of artillery, which usually launches a projectile using explosive chemical propellant. Gunpowder ("black powder") was the primary propellant before the invention of smokeless powder during th ...
armament was ever fitted aboard the type. The early Mirage IVA had a fuselage recess under the engines which could hold a single AN-11 or AN-22 nuclear weapon of 60  kt yield. The Mirage IV can carry 12 solid-fuel rockets diagonally down below the wing flaps, for rocket-assisted take off (RATO). From 1972 onward, 12 aircraft were also equipped to carry the CT52 reconnaissance pod in the bomb recess. These aircraft were designated Mirage IVR for reconnaissance. The CT52 was available in either BA (''Basse Altitude'', low-level) or HA (''Haute Altitude'', high-altitude) versions with three or four long-range cameras; a third configuration used an
infrared Infrared (IR; sometimes called infrared light) is electromagnetic radiation (EMR) with wavelengths longer than that of visible light but shorter than microwaves. The infrared spectral band begins with the waves that are just longer than those ...
line scanner. The CT52 had no digital systems, relying on older wet-film cameras. The first operational use of the system took place during missions in
Chad Chad, officially the Republic of Chad, is a landlocked country at the crossroads of North Africa, North and Central Africa. It is bordered by Libya to Chad–Libya border, the north, Sudan to Chad–Sudan border, the east, the Central Afric ...
in September 1974. During the 1980s, a total of 18 Mirage IVs were retrofitted with a centreline pylon and associated equipment to carry and launch the nuclear Air-Sol Moyenne Portée (ASMP) stand-off missile. The Mirage IVA could theoretically carry up to six large conventional bombs at the cost of drop tanks and ECM pods; such armament was rarely fitted in practice.Wagner 2009, p. 128.


Operational history


Introduction and early operations

In February 1964 deliveries of the Mirage IV to the French Air Force started, with the first French Mirage IV squadron being declared operational on 1 October that year.Jackson 1987, p. 168. The Mirage IV bomber force soon consisted of nine squadrons of four aircraft (2 pairs – one aircraft carrying the nuclear bomb, one a buddy-refuelling tanker) each. When fully built up, the force consisted of three wings. These wings were each divided into three bomber squadrons, each equipped with a total of four Mirage IVs, with each deployed at a different base to minimise the potential for an enemy strike to knock out the entire bomber force. These squadrons were:Jackson 1985, pp. 70–71. * 1/91 'Gascogne' based at Mont de Marsan * 2/91 'Bretagne' based at Cazaux * 3/91 'Beauvaisis' based at
Creil Creil () is a Communes of France, commune in the Oise Departments of France, department, northern France. The Creil station is an important railway junction. History Archaeological remains in the area include a Neolithic site as well as a late ...
* 1/93 'Guyenne' based at Istres * 2/93 'Cevennes' based at Orange * 3/93 'Sambre' based at
Cambrai Cambrai (, ; ; ), formerly Cambray and historically in English Camerick or Camericke, is a city in the Nord department and in the Hauts-de-France region of France on the Scheldt river, which is known locally as the Escaut river. A sub-pref ...
* 1/94 'Bourbonnais' based at Avord * 2/94 'Marne' based at St-Dizier * 3/94 'Arbois' based at
Luxeuil Luxeuil-les-Bains () is a Communes of France, commune in the Haute-Saône Departments of France, department in the Regions of France, region of Bourgogne-Franche-Comté west of Mulhouse in eastern France. History Luxeuil (sometimes rendered Lux ...
After establishment of its own deterrent force, the ''Force de Dissuassion'', more commonly known as the ''
Force de frappe The ''Force de dissuasion'' (), known as the ''Force de frappe'' ('Strike Force') prior to 1961,Gunston, Bill. Bombers of the West. New York: Charles Scribner's and Sons; 1973. p104 is the French nuclear deterrence force. The ''Force de dissua ...
'', France withdrew from the military command structure of
NATO The North Atlantic Treaty Organization (NATO ; , OTAN), also called the North Atlantic Alliance, is an intergovernmental organization, intergovernmental Transnationalism, transnational military alliance of 32 Member states of NATO, member s ...
in
1966 Events January * January 1 – In a coup, Colonel Jean-Bédel Bokassa takes over as military ruler of the Central African Republic, ousting President David Dacko. * January 3 – 1966 Upper Voltan coup d'état: President Maurice Yaméogo i ...
.Jackson 1987, pp. 168–170. De Gaulle viewed the operational establishment of the Mirage IV fleet, a critical component of the independent ''Force de frappe'', as highly influential to his decision to withdraw France from NATO, and that an independent French nuclear deterrent was necessary to ensure independence as a nation. From 1964 to 1971, the Mirage IV was France's sole means of delivering nuclear ordnance. At this point they were each armed with a single 60 kiloton nuclear bomb. Alert status consisted of an active inventory of 36 Mirage IVs. At any one time 12 aircraft would be in the air, with a further 12 on the ground kept at four minutes' readiness and the final 12 at 45 minutes' readiness, each equipped with an onboard functional nuclear weapon. These 36 active aircraft would be rotated with 26 reserve aircraft; the latter were kept in an airworthy condition or were otherwise subject to maintenance activities. Within the first decade of the type entering service, in excess of 200,000 hours were flown and 40,000 aerial refuelling operations were performed by the Mirage IV fleet alone; at one point, Mirage IV operations were consuming up to 44 per cent of the French Air Force's total spare parts budget. The primary objectives of the Mirage IVA force were major Soviet cities and bases. With
aerial refueling Aerial refueling ( en-us), or aerial refuelling ( en-gb), also referred to as air refueling, in-flight refueling (IFR), air-to-air refueling (AAR), and tanking, is the process of transferring aviation fuel from one aircraft (the tanker) to an ...
, the plane was able to attack
Moscow Moscow is the Capital city, capital and List of cities and towns in Russia by population, largest city of Russia, standing on the Moskva (river), Moskva River in Central Russia. It has a population estimated at over 13 million residents with ...
,
Murmansk Murmansk () is a port city and the administrative center of Murmansk Oblast in the far Far North (Russia), northwest part of Russia. It is the world's largest city north of the Arctic Circle and sits on both slopes and banks of a modest fjord, Ko ...
or various Ukrainian cities when sortieing from French bases. A justification of the Mirage IV given by Armée de l'air Brigadier General Pierre Marie Gallois, an architect of the French nuclear deterrent, was that: "France is not a prize worthy of ten Russian cities". In order to refuel the Mirage IVA fleet, France purchased 14 (12 plus 2 spares) U.S. Boeing C-135F tankers. Mirage IVAs also often operated in pairs, with one aircraft carrying a weapon and the other carrying fuel tanks and a buddy refueling pack, allowing it to refuel its partner en route to the target. Even so, some sources state that some of the mission profiles envisioned were actually one-way, with the crew having no chance of returning after bombing a Soviet city. The inability for the Mirage IV to return after missions had been a point of controversy during the aircraft's early development.Gunston and Gilchrist 1993, pp. 196–197. Both flight and ground crews received training principally by
Strategic Air Forces Command The Strategic Air Forces (FAS) () is a command of the French Air and Space Force. It was created on January 14, 1964, and directs France's nuclear bombardment force. The headquarters was formerly at Taverny Air Base, but has now moved to Véli ...
328, stationed at
Bordeaux Bordeaux ( ; ; Gascon language, Gascon ; ) is a city on the river Garonne in the Gironde Departments of France, department, southwestern France. A port city, it is the capital of the Nouvelle-Aquitaine region, as well as the Prefectures in F ...
. Several Nord Noratlas were specially modified, having received the Mirage IV's radar, control consoles, and additional electrical generators, for the purpose of training navigators; these were later replaced by a pair of customised
Dassault Falcon 20 The Dassault Falcon 20 is a French business jet developed and manufactured by Dassault Aviation. The first business jet developed by the firm, it became the first of a family of business jets to be produced under the same name; of these, both t ...
outfitted with much of the Mirage IVP's avionics.


Transition and upgrades

Initially, the basic attack flight profile was "high-high-high" at a speed of Mach 1.85, engaging targets up to a maximum radius of 3,500 km (2,175 mi). In the late 1960s, when the threat of
surface-to-air missile A surface-to-air missile (SAM), also known as a ground-to-air missile (GTAM) or surface-to-air guided weapon (SAGW), is a missile designed to be launched from the ground or the sea to destroy aircraft or other missiles. It is one type of anti-ai ...
defences made high-altitude flight too hazardous, the Mirage IVA was modified for low-altitude penetration. Flying low, the maximum attack speed was reduced to 1,100 km/h (680 mph) and the combat radius was also decreased. By 1963, the majority of missions involving the Mirage IV were being planned as low-level flights.Gunston 1973, p. 116. By 1964, Mirage IVAs were conducting training penetration runs at an altitude of 200 ft, without the assistance of
terrain-following radar Terrain-following radar (TFR) is a military aerospace technology that allows a very-low-flying aircraft to automatically maintain a relatively constant altitude above ground level and therefore make detection by enemy radar more difficult. It is ...
, which subjected pilots to considerable workload and those on board to high levels of
turbulence In fluid dynamics, turbulence or turbulent flow is fluid motion characterized by chaotic changes in pressure and flow velocity. It is in contrast to laminar flow, which occurs when a fluid flows in parallel layers with no disruption between ...
. To improve survivability, the French Air Force began dispersing Mirage IVs to pre-prepared rough strips during the 1960s; while the use of hardened
bunker A bunker is a defensive military fortification designed to protect people and valued materials from falling bombs, artillery, or other attacks. Bunkers are almost always underground, in contrast to blockhouses which are mostly above ground. T ...
s had been assessed, it was found to be financially impractical.Gunston and Gilchrist 1993, p. 200. By the 1970s, it had become clear that vulnerability of the Mirage IV to air defences, even while flying at low altitudes, had made the delivery of gravity bombs such as the ''AN-11'' or ''AN-22'' impractical. Thus, it was decided to pass a greater share of the deterrent role onto land-based
missiles A missile is an airborne ranged weapon capable of self-propelled flight aided usually by a propellant, jet engine or rocket motor. Historically, 'missile' referred to any projectile that is thrown, shot or propelled towards a target; this u ...
and
submarine-launched ballistic missile A submarine-launched ballistic missile (SLBM) is a ballistic missile capable of being launched from Ballistic missile submarine, submarines. Modern variants usually deliver multiple independently targetable reentry vehicles (MIRVs), each of which ...
alternatives; as a result, a single wing of Mirage IVs was stood down in 1976, partially due to fleet-wide attrition losses.Jackson 1987, p. 171. In 1973, it was reported that a force of 40 Mirage IVs would continue to perform as a part of France's nuclear deterrent until the 1980s, and that steady improvements were to be undertaken. In 1975, all Mirage IVs were progressively painted in a new green/grey camouflage scheme.Gunston and Gilchrist 1993, p. 201. In 1979, in response to the decreasing effectiveness of free-fall bombs used by both its strategic and tactical nuclear forces, development of the ASMP stand-off missile was initiated; the ASMP would possess a range of up to 400 km (250 mi) and was alternative armed with either a single 150 or 300 kiloton nuclear warhead.Jackson 1987, p. 163. Various test launches of dummy and later live ASMPs were performed using the Mirage IV as the launch platform between 1981 and 1983. In July 1984, a contract was formally issued for the upgrade of a total of 18 Mirage IVAs to carry the ASMP missile in the place of traditional bombs; these aircraft were redesignated Mirage IVP (Penetration).Michell 1994, p. 50. The conversion of Mirage IVAs to IVPs involved a large number of modifications and re-workings of the aircraft. A deep centerline pylon was added, which could accommodate either a single ASMP missile or a CT52 reconnaissance pod. The main radar and electronics suite were removed and replaced by newer counterparts; other modified systems included the navigation system, flight control system, and various elements of the cockpit. On 12 October 1982, the first modernised Mirage IVP performed its first flight; it re-entered active service on 1 May 1986. In August 1985, a French proposal that would have seen Mirage IVPs stationed at air bases inside neighbouring
West Germany West Germany was the common English name for the Federal Republic of Germany (FRG) from its formation on 23 May 1949 until German reunification, its reunification with East Germany on 3 October 1990. It is sometimes known as the Bonn Republi ...
was made public; this deployment would have marked a significant philosophical departure from traditional French nuclear defence policy. Aviation authors Bill Gunston and Peter Gilchrist allege that French officials had historically discounted the option of recovering Mirage IVs in friendly territory as unduly optimistic, as those nations might become unfriendly or hostile in the aftermath of a French nuclear attack.


Phase-Out

On 31 July 1996, the Mirage IVP was formally retired in its bomber capacity, the nuclear mission having been transferred from the Mirage IV to the newer Dassault Mirage 2000N. EB 2/91 was disbanded and EB 1/91 was redesignated ERS 1/91 (''Escadron de Reconnaissance Stratégique'', Strategic Reconnaissance Squadron), using five remaining Mirage IVPs based at
Mont-de-Marsan Mont-de-Marsan (; Gascon dialect, Occitan: ''Lo Mont de Marçan'') is a communes of France, commune and capital of the Landes (department), Landes Departments of France, department, Nouvelle-Aquitaine, southwestern France. Population Milit ...
; the remaining aircraft were stored at Chateaudun. In the reconnaissance role, the Mirage IVP has seen service over
Bosnia Bosnia and Herzegovina, sometimes known as Bosnia-Herzegovina and informally as Bosnia, is a country in Southeast Europe. Situated on the Balkans, Balkan Peninsula, it borders Serbia to the east, Montenegro to the southeast, and Croatia to th ...
,
Iraq Iraq, officially the Republic of Iraq, is a country in West Asia. It is bordered by Saudi Arabia to Iraq–Saudi Arabia border, the south, Turkey to Iraq–Turkey border, the north, Iran to Iran–Iraq border, the east, the Persian Gulf and ...
,
Kosovo Kosovo, officially the Republic of Kosovo, is a landlocked country in Southeast Europe with International recognition of Kosovo, partial diplomatic recognition. It is bordered by Albania to the southwest, Montenegro to the west, Serbia to the ...
and
Afghanistan Afghanistan, officially the Islamic Emirate of Afghanistan, is a landlocked country located at the crossroads of Central Asia and South Asia. It is bordered by Pakistan to the Durand Line, east and south, Iran to the Afghanistan–Iran borde ...
. ES 1/91 Gascogne's surviving Mirage IVPs were retired in
2005 2005 was designated as the International Year for Sport and Physical Education and the International Year of Microcredit. The beginning of 2005 also marked the end of the International Decade of the World's Indigenous Peoples, Internationa ...
and are conserved and stored at the ''Centre d'Instruction Forces Aériennes Stratégiques'' (CIFAS) at Bordeaux Mérignac. The retirement of all reconnaissance-configured Mirage IVPs in 2005 meant that the French Air Force's Mirage F1CRs were for some time the only aircraft capable of carrying out aerial reconnaissance missions. The long term replacement for the Mirage IVP was Mirage 2000N aircraft outfitted with a modern PRNG ''Pod de Reconnaissance Nouvelle Génération'' (New Generation Reconnaissance Pod), equipped with
digital camera A digital camera, also called a digicam, is a camera that captures photographs in Digital data storage, digital memory. Most cameras produced today are digital, largely replacing those that capture images on photographic film or film stock. Dig ...
equipment. The Mirage IV had been popular with its crews, who found it enjoyable to fly. In addition, it required surprisingly little maintenance considering its age and complexity.


Operators

; *
French Air Force The French Air and Space Force (, , ) is the air force, air and space force of the French Armed Forces. Formed in 1909 as the ("Aeronautical Service"), a service arm of the French Army, it became an independent military branch in 1934 as the Fr ...


Aircraft on display


Mirage IV A

* Mirage IV A ''s/n:2-AB'' is on display at the
Musée de l'air et de l'espace The Musée de l'air et de l'espace (, ) is a French aerospace museum, located at the south-eastern edge of Paris–Le Bourget Airport, north of Paris, and in the Communes of France, commune of Le Bourget. It was inaugurated in 1919 after a propo ...
at Paris-Le Bourget * Mirage IV A ''s/n:4-AC'' is on display at Rochefort airbase. * Mirage IV A ''s/n:6-AG'' is on display at Savigny-les-Beaune. * Mirage IV A ''s/n:9-AH'' is on display at the
Musée de l'Air et de l'Espace The Musée de l'air et de l'espace (, ) is a French aerospace museum, located at the south-eastern edge of Paris–Le Bourget Airport, north of Paris, and in the Communes of France, commune of Le Bourget. It was inaugurated in 1919 after a propo ...
at Paris-Le Bourget. This actual aircraft used to drop live nuclear bombs during '' Tamouré'' test. * Mirage IV A ''s/n:16-AO'' is on display at St Dizier airbase. * Mirage IV A ''s/n:18-AQ'' is on display at Savigny-les-Beaune Museum. * Mirage IV A ''s/n:31-BC'' is on display at Musée Européen de l'Aviation de Chasse. * Mirage IV A ''s/n:32-BE'' is on display at Orange airbase. * Mirage IV A ''s/n:43-BP'' is on display at Mont-de-Marsan Air Base. * Mirage IV A ''s/n:45-BR'' was formerly displayed in the Paris Science Museum, but was donated to the Yorkshire Air Museum in 2016; the aircraft arrived in March 2017.


Mirage IV P

* Mirage IV P ''1 "AP"'' is on display at Châteaudun Air Base (CANOPEE Museum). * Mirage IV P ''11-AJ'' is on display at Bordeaux airbase. * Mirage IV P ''23-AV'' is on display at Cazaux airbase. * Mirage IV P ''25-AX'' is on display at Musée de l'Epopée et de l'Industrie Aéronautique. * Mirage IV P ''26-AY'' is on display at Ailes Anciennes Toulouse. * Mirage IV P ''28-BA'' Musée de l'Aviation Clément Ader. * Mirage IV P ''29-BB'' is on display at Avord airbase.It recreates the aircraft in flight with the wheels retracted and a processed support attached to the engine nozzle. * Mirage IV P ''36 "BI"'' is on display at Istres airbase. * Mirage IV P ''59 "CF"'' is on display at Creil airbase. * Mirage IV P ''61 "CH"'' is on display at St Dizier Aero retro Museum. * Mirage IV P ''62 "CI"'' is on display at the Musée de l'Air et de l'Espace at Paris-Le Bourget."Aviation Militaire: Dassault Mirage IV."
.


Specifications (Mirage IVA)


See also

*
Avro Vulcan The Avro Vulcan (later Hawker Siddeley Vulcan from July 1963) was a jet-powered, tailless, delta-wing, high-altitude, strategic bomber, which was operated by the Royal Air Force (RAF) from 1956 until 1984. Aircraft manufacturer A.V. Roe ...
*
Convair B-58 Hustler The Convair B-58 Hustler, designed and produced by American aircraft manufacturer Convair, was the first operational bomber capable of Mach 2 flight. The B-58 was developed during the 1950s for the United States Air Force (USAF) Strategic Air ...
* North American A-5 Vigilante *
Tupolev Tu-22 The Tupolev Tu-22 ( Air Standardization Coordinating Committee name: Blinder) was the first supersonic bomber to enter production in the Soviet Union. Manufactured by Tupolev, the Tu-22 entered service with Long-Range Aviation and Soviet Nav ...


References


Citations


Bibliography

* Donald, David and John Lake. ''Encyclopedia of World Military Aircraft''. London:Aerospace Publishing, 1994. . * Gunston, Bill. Bombers of the West. New York: Charles Scribner's and Sons; 1973. . * Gunston, Bill and Peter Gilchrist. ''Jet Bombers: From the Messerschmitt Me 262 to the Stealth B-2''. Osprey, 1993. . * Jackson, Paul. ''Modern Combat Aircraft 23: Mirage''. Shepperton, UK: Ian Allan, 1985. . * Jackson, Paul. "Pénétration Augumentation". ''
Air International ''AIR International'' is a British aviation magazine covering current defence aerospace and civil aviation topics. It has been in publication since 1971 and is currently published by Key Publishing Ltd. History and profile The magazine was fir ...
'', April 1987, Vol. 32 No. 4. pp. 163–171. ISSN 0306-5634. * Lake, Jon. ''The Great Book of Bombers: The World's Most Important Bombers from World War I to the Present Day''. Zenith Imprint, 2002. . * Michell, Simon. ''Jane's Civil and Military Upgrades 1994–95''. Coulsdon, UK: Jane's Information Group, 1994. . * Sokolski, Henry D
''Getting MAD: Nuclear Mutual Assured Destruction, Its Origins and Practice''.
DIANE Publishing, November 2004. . * Spencer, Tucker. ''The Encyclopedia of Middle East Wars Volumes The United States in the Persian Gulf, Afghanistan, and Iraq Conflicts''. ABC-CLIO, 2010. .
"Tangible Mirages: The Most Successful Family of European Aeroplanes."
''Flight International'', 4 January 1962. pp. 18–21. * Wagner, Paul J. "Air Force Tac Recce Aircraft: NATO and Non-aligned Western European Air Force Tactical Reconnaissance Aircraft of the Cold War (1949–1989)." ''Dorrance Publishing'', 2009. . * Withington, Thomas. "A Grand Illusion? The RAF & the Spey Mirage IV, 1965". '' The Aviation Historian''. No. 33. 2020. pp.38-45. *


Further reading

*


External links


Mirage IV information and photos by Yves Fauconnier
(French)

(French)

(English) {{DEFAULTSORT:Dassault Mirage Iv Mirage IV Tailless delta-wing aircraft 1960s French bomber aircraft Military articles needing translation from French Wikipedia Twinjets Aircraft first flown in 1959 Strategic bombers Aircraft with retractable tricycle landing gear Low-wing aircraft