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Description

Link: www.flickr.com/photos/dizzyfug…

Some background:
The Q-6 program was initiated in the mid-1970s when, during the Battle of the Paracel Islands in 1974, the People's Liberation Army Air Force (PLAAF) and People's Liberation Army Naval Air Force (PLANAF) proved incapable of ground support missions. Due to the lack of modern avionics and ground infrastructure to support a modern air war, Chinese aircraft suffered navigation and other logistics problems that severely limited their performance. The first Chinese aircraft did not actually reach the islands until several hours after the battle was over.

In addition to the need to upgrade its logistics capability and infrastructure, China also decided that nothing-in-its-then-aircraft-inventory could fill the requirement for support missions in the South China Sea. Fighters such as the J-5, J-6, J-7, and J-8 lacked a ground attack capability and were hampered by short range. The only Chinese ground attack aircraft atr that time, the Nanchang Q-5 (a MiG-19 derivate with a solid nose, an internal weapon bay and lateral air intakes), was also short ranged and had a relatively low payload. China's bombers such as the Harbin H-5 and Xian H-6 were slow and lacked a sufficient self-defense capability. A new aircraft was therefore seen as desperately needed to fulfill a new naval strike mission in support of the People's Liberation Army Navy (PLAN).

Immediately after the battle, both the PLAAF and PLAN submitted their requirements for a new fighter bomber/ground attack aircraft to the 3rd Ministry of PRC. After extensive research, the 3rd Ministry decided that, based on the Chinese aeronautical industrial capability at the time, it was impossible to develop two separate airplanes at the same time. Instead, a decision was made to develop a single airplane when the prime requirements of the PLAAF and PLAN were similar, even though with different versions tailored to meet the different secondary needs of PLAAF and PLAN.

In June 1976 representatives from various aircraft factories were summoned to Beijing to discuss the project, and were instructed to come up with designs in the shortest possible time. Shenyang Aircraft Factory (later reorganized into Shenyang Aircraft Corporation) was the first to come up with a design, the JH-8 (FB-8), which was essentially a ground attack version of the large, twin-engined J-8II (F-8II) interceptor. Next came the Q-6, a new design from the Nanchang Aircraft Factory. The Xi'an Aircraft Factory (later reorganized into Xi'an Aircraft Industrial Corporation) was the last one to present a design, the Xian JH-7, also a new design.

Initially, the 3rd Ministry favored the JH-8, however because the design of the operational J-8II was still not completed the risk was considered to be too high, so it was eliminated. The projected development of JH-7 was too far out, and so the Q-6 was selected because it was believed to be the one that would be able for service the soonest.

The Q-6's distictive feature was its swing wing arrangement, and the project was China's first venture into this direction. Before the Q-6 program started, however, China had already obtained MiG-23BN and MiG-23MS aircraft from Egypt. A few downed F-111 were also provided to China by North Vietnam. Based on the research effort performed on these aircraft, it was suggested that the variable-sweep wing should be adopted for China's new ground attack aircraft.

The general designer of Nanchang Q-5, and the future academician of the Chinese Academy of Sciences (elected in 1995), Mr. Lu Xiaopeng, was named as the general designer of Q-6. Lu personally visited PLAAF and PLANAF numerous times to obtain their input, which was the base of the Tactical Technological Requirements of the Q-6 he was in charge of, and by February 1979, the general design of the attack aircraft was finalized, based on the initial requirement of the 3rd Ministry.

The original plan was to base the design of Q-6 on the MiG-23BN, the ground attack version of MiG-23. However, both PLAAF and PLAN required a true dogfight capability for self-defense. Due to the need of dogfight capability, a radar was needed, and the ground attack version of the Soviet fighter had no radar. As a result, the plan was changed to base the design on the MiG-23MS instead. But this was not a true solution: Studies revealed that in order to successfully perform the required missions for PLAAF and PLANAF, ground attack radar, as well as terrain-following radar, were needed, too. And for the intended dogfight capability, the RP-22 Sapfir-21 radar (NATO reporting name Jay Bird) of the MiG-23MS lacked the BVR capability.

Facing this technological lack the decision was made to use avionics reverse-engineered from the F-111 to makeup the MiG-23 shortcomings. But as with other technological features adopted for the Q-6, they were proven to be way too ambitious for the Chinese industrial, scientific and technological capability at the time, which resulted in prolonged development.

Problems did not stop, the airframe itself proved to be troublesome, too. Originally the design was based on the MiG-23MS, and was initially thought to be better than the MiG-23BN, because it provided more room in the nosecone to house the radar.
However, the Chinese microelectronic industry could not provide the solid state electronics needed to miniaturize the intended radar, and as a result, the size of the fuselage had theoretically to be increased from the size of the MiG-23 to that of the Su-24 to fit an appropriate radar dish with the technolgy available at that time. Research furthermore revealed that the side-intakes of the MiG-23 design were not sufficient enough to meet the required dogfight capability, so the side-intakes arrangement was changed into a single chin-intake instead, and the Q-6 is claimed to be the first Chinese aircraft to have a chin-mounted intake.

The engine itself was also a problem, since China did not possess a powerful jet fighter engine that would match the intended performance profile of the Q-6. At first there were plans to use 122.4 kN thrust of a WS-6 engine (which was used in the H-6/Tu-16 bomber!), but these were not suited for a fighter and simply too large. To match the targets of an aircraft weight of 14.500 kg, the biggest load of bombs of 4.500 kilograms and a combat radius of 900 km, the Q-6 was finally outfitted with the Wopen WS-9 afterburning turbofan - a license-built Rolls Royce RB.168 Spey Mk. 202 with 91.3 kN of thrust.

Chinese considered the greatest achievement of the Q-6 in its fly-by-wire (FBW) control of the variable-sweep wings, both were the first of its kind in China. The original goal of reverse-engineering the FBW of the F-111 proved to be way too ambitious and had to be abandoned, so a much simpler version was adopted. The triplex analog FBW of the Q-6 was effectively just slightly more advanced than the most rudimentary FBW in that the mechanical servo valves were replaced with electrical servo valves, operated by electronic controllers. But contrary to the most rudimentary FBW, where hydraulic actuators still existed, the hydraulic actuators are replaced by electrical actuators on the Q-6. Anyway, this system proved to be the major obstacle in the hardware development of the Q-6 and it took nine years to complete (1980–1988), under the personal leadership of Mr. Lu Xiaopeng.

In 1988, three prototypes were built: one for static test, one for avionics tests on the ground, and one for the variable sweep wing research. The serial aircraft for PLAAF and PLANAF would have been separate variants, called Q-6A and Q-6B, which are believed to be offered for export now (see below).

Although hailed as a technological breakthrough for the Chinese aviation and providing superior performance to fixed-wing designs (esp. the outdated Q-5), the Chinese system was more than 12% heavier than the simple mechanical-hydraulic controlled variable-sweep wing of the benchmark MiG-23, and the Q-6 avionics were still far from being up-to-date.
Once identified as an indigenous aircraft (the Q-6 was at first deemed to be a variant or straight copy of the MiG-23/27, and therefore premilinarily coded 'Flogger L'), NATO alloted the Code 'Fruitcase' to it, with suffixes for the various export variants (see below).

It was not before 1990 that the aircraft was completed and (theoretically) ready for service – but at that time, technology and military strategy had already changed, and China had been developing the more capable (but much bigger) twin-engined Xian JH-7 fighter bomber for PLAAF and PLANAF. But it would still take some years until the JH-7A would enter service with the PLANAF: in early 2004, and with the PLAAF by the end of the year.

For China, the most important factor which prevented the Q-6 introduction into PLAAF and PLANAF service, was the 'discovery' of stealth features on the battlefield: variable-sweep wing would enlarge the aircraft's radar cross section multiple times and thus making it impossible to survive on the modern battlefield, because it would be much more likely to be detected and shot down.

Anyway, internal politics did not stop China from offering the now completed airframe on the export market as A-6 'Kong Yun' ("Cloud"), as a more capable successor to the Nanchang A-5 (the export version of the MiG-19-based Q-5). From 1992 onwards, several former A-5 users bought the aircraft as A-6 multi-role fighters. It is assumed that these correspond to the Q-6's development lines for PLAAAF an PLANAF.

Current users are the Bangladeshi Air Force (8× A-6B), Myanmar Air Force (20× A-6C), Sri Lanka (11× A-6B) Korean People's Air Force (probably less than 50x A-6A) and the Sudanese Air Force (A total of about 20, 3–11 of them servicable, probably all A-6A).
A-6A ('Fruitcase A'):
The first version and despite being marketed as a "multi-role combat aircraft" a very simple variant with a small radome, probably containing a Type 226 pulse-Doppler radar (a Chinese copy of the GEC-Marconi Skyranger).
A-6B ('Fruitcase B'):
Similar in apperance to the A-6A with a bigger radome. This variant is equipped with a Chinese KLJ-6E pulse-Doppler radar (A Chinese copy of the Italian Pointer-2500 radar, the same as featured on the Chinese Q-5M Fantan attack aircraft), which gives all weather attack capability. These aircraft are also fitted with a HUD, a GPS receiver/inertial navigation system, a 360° radar warning system, a tactical radio navigation system and chaff/flare dispensers on the rear fuselage.
The Sri Lanka aircraft have been seen carrying an external FLIR pod on one of the underfuselage pylons, while the Bangladeshi Air Force aircraft exclusively feature a small fairing under the nose which is believed to contain a LR/MTS, allowing the deployment of PGM.
A-6C ('Fruitcase C'):
Dedicated ground attack variant with a solid, more slender nose and full PGM capability. The nose features a fairing with windows for an ALR-1 laser rangefinder/marked target seeker (LR/MTS) in a small ball turret, and possibly LLLTV/FLIR. This optical system offers day/night attack capability. Like the A-6B, these aircraft feature HUD, GPS, tactical radio and optional flare dispensers.

General characteristics:
Crew: 1
Length: 56 ft 1 in (17.10 m)
Wingspan: 47 ft 2 in (14.4m) at 16°, 28 ft 6 in (8,7m) at 72°
Height: 15 ft 9.5 in (4.82 m)
Empty weight: 16.520 lb (7.500 kg)
Loaded weight: 28.370 lb (12.880 kg)
Max. take-off weight: 32.820 lb (14.900 kg)

Powerplant:
1× Xian WS-9 Qin Ling afterburning turbofan (a license-built Rolls Royce RB.168 Spey Mk. 202), rated at 54,6 kN (5.562kp) dry and at 91,3KN (9.305kp) at full afterburner

Performance:
Maximum speed: Mach 1.2 at low altitude and in clean configuration, subsonic with external ordnance; 1.055mph (1.700 km/h) at height and in clean configuration
Combat radius: 485 nmi (560 mi, 900 km)
Service ceiling: 49.180 ft (15.000 m)

Armament:
2× Type 23-III twin-barreled 23mm cannons in the wing roots with 200 RPG
7× Hardpoints (three under the fuselage, one under each fixed wing root and the mobile outer wings) for a maximum external ordnance of 10.000 lbs (4.540kg), including guided and unguided bombs, missiles, napalm tanks or 800l drop tanks; the two hardpoints under the outer wings are fixed and can only be used when the wings are kept in the most forward position (they are normally only used for drop tanks in ferry configuration).

Description

Link: www.flickr.com/photos/dizzyfug…

Some background:
The Q-6 program was initiated in the mid-1970s when, during the Battle of the Paracel Islands in 1974, the People's Liberation Army Air Force (PLAAF) and People's Liberation Army Naval Air Force (PLANAF) proved incapable of ground support missions. Due to the lack of modern avionics and ground infrastructure to support a modern air war, Chinese aircraft suffered navigation and other logistics problems that severely limited their performance. The first Chinese aircraft did not actually reach the islands until several hours after the battle was over.

In addition to the need to upgrade its logistics capability and infrastructure, China also decided that nothing-in-its-then-aircraft-inventory could fill the requirement for support missions in the South China Sea. Fighters such as the J-5, J-6, J-7, and J-8 lacked a ground attack capability and were hampered by short range. The only Chinese ground attack aircraft atr that time, the Nanchang Q-5 (a MiG-19 derivate with a solid nose, an internal weapon bay and lateral air intakes), was also short ranged and had a relatively low payload. China's bombers such as the Harbin H-5 and Xian H-6 were slow and lacked a sufficient self-defense capability. A new aircraft was therefore seen as desperately needed to fulfill a new naval strike mission in support of the People's Liberation Army Navy (PLAN).

Immediately after the battle, both the PLAAF and PLAN submitted their requirements for a new fighter bomber/ground attack aircraft to the 3rd Ministry of PRC. After extensive research, the 3rd Ministry decided that, based on the Chinese aeronautical industrial capability at the time, it was impossible to develop two separate airplanes at the same time. Instead, a decision was made to develop a single airplane when the prime requirements of the PLAAF and PLAN were similar, even though with different versions tailored to meet the different secondary needs of PLAAF and PLAN.

In June 1976 representatives from various aircraft factories were summoned to Beijing to discuss the project, and were instructed to come up with designs in the shortest possible time. Shenyang Aircraft Factory (later reorganized into Shenyang Aircraft Corporation) was the first to come up with a design, the JH-8 (FB-8), which was essentially a ground attack version of the large, twin-engined J-8II (F-8II) interceptor. Next came the Q-6, a new design from the Nanchang Aircraft Factory. The Xi'an Aircraft Factory (later reorganized into Xi'an Aircraft Industrial Corporation) was the last one to present a design, the Xian JH-7, also a new design.

Initially, the 3rd Ministry favored the JH-8, however because the design of the operational J-8II was still not completed the risk was considered to be too high, so it was eliminated. The projected development of JH-7 was too far out, and so the Q-6 was selected because it was believed to be the one that would be able for service the soonest.

The Q-6's distictive feature was its swing wing arrangement, and the project was China's first venture into this direction. Before the Q-6 program started, however, China had already obtained MiG-23BN and MiG-23MS aircraft from Egypt. A few downed F-111 were also provided to China by North Vietnam. Based on the research effort performed on these aircraft, it was suggested that the variable-sweep wing should be adopted for China's new ground attack aircraft.

The general designer of Nanchang Q-5, and the future academician of the Chinese Academy of Sciences (elected in 1995), Mr. Lu Xiaopeng, was named as the general designer of Q-6. Lu personally visited PLAAF and PLANAF numerous times to obtain their input, which was the base of the Tactical Technological Requirements of the Q-6 he was in charge of, and by February 1979, the general design of the attack aircraft was finalized, based on the initial requirement of the 3rd Ministry.

The original plan was to base the design of Q-6 on the MiG-23BN, the ground attack version of MiG-23. However, both PLAAF and PLAN required a true dogfight capability for self-defense. Due to the need of dogfight capability, a radar was needed, and the ground attack version of the Soviet fighter had no radar. As a result, the plan was changed to base the design on the MiG-23MS instead. But this was not a true solution: Studies revealed that in order to successfully perform the required missions for PLAAF and PLANAF, ground attack radar, as well as terrain-following radar, were needed, too. And for the intended dogfight capability, the RP-22 Sapfir-21 radar (NATO reporting name Jay Bird) of the MiG-23MS lacked the BVR capability.

Facing this technological lack the decision was made to use avionics reverse-engineered from the F-111 to makeup the MiG-23 shortcomings. But as with other technological features adopted for the Q-6, they were proven to be way too ambitious for the Chinese industrial, scientific and technological capability at the time, which resulted in prolonged development.

Problems did not stop, the airframe itself proved to be troublesome, too. Originally the design was based on the MiG-23MS, and was initially thought to be better than the MiG-23BN, because it provided more room in the nosecone to house the radar.
However, the Chinese microelectronic industry could not provide the solid state electronics needed to miniaturize the intended radar, and as a result, the size of the fuselage had theoretically to be increased from the size of the MiG-23 to that of the Su-24 to fit an appropriate radar dish with the technolgy available at that time. Research furthermore revealed that the side-intakes of the MiG-23 design were not sufficient enough to meet the required dogfight capability, so the side-intakes arrangement was changed into a single chin-intake instead, and the Q-6 is claimed to be the first Chinese aircraft to have a chin-mounted intake.

The engine itself was also a problem, since China did not possess a powerful jet fighter engine that would match the intended performance profile of the Q-6. At first there were plans to use 122.4 kN thrust of a WS-6 engine (which was used in the H-6/Tu-16 bomber!), but these were not suited for a fighter and simply too large. To match the targets of an aircraft weight of 14.500 kg, the biggest load of bombs of 4.500 kilograms and a combat radius of 900 km, the Q-6 was finally outfitted with the Wopen WS-9 afterburning turbofan - a license-built Rolls Royce RB.168 Spey Mk. 202 with 91.3 kN of thrust.

Chinese considered the greatest achievement of the Q-6 in its fly-by-wire (FBW) control of the variable-sweep wings, both were the first of its kind in China. The original goal of reverse-engineering the FBW of the F-111 proved to be way too ambitious and had to be abandoned, so a much simpler version was adopted. The triplex analog FBW of the Q-6 was effectively just slightly more advanced than the most rudimentary FBW in that the mechanical servo valves were replaced with electrical servo valves, operated by electronic controllers. But contrary to the most rudimentary FBW, where hydraulic actuators still existed, the hydraulic actuators are replaced by electrical actuators on the Q-6. Anyway, this system proved to be the major obstacle in the hardware development of the Q-6 and it took nine years to complete (1980–1988), under the personal leadership of Mr. Lu Xiaopeng.

In 1988, three prototypes were built: one for static test, one for avionics tests on the ground, and one for the variable sweep wing research. The serial aircraft for PLAAF and PLANAF would have been separate variants, called Q-6A and Q-6B, which are believed to be offered for export now (see below).

Although hailed as a technological breakthrough for the Chinese aviation and providing superior performance to fixed-wing designs (esp. the outdated Q-5), the Chinese system was more than 12% heavier than the simple mechanical-hydraulic controlled variable-sweep wing of the benchmark MiG-23, and the Q-6 avionics were still far from being up-to-date.
Once identified as an indigenous aircraft (the Q-6 was at first deemed to be a variant or straight copy of the MiG-23/27, and therefore premilinarily coded 'Flogger L'), NATO alloted the Code 'Fruitcase' to it, with suffixes for the various export variants (see below).

It was not before 1990 that the aircraft was completed and (theoretically) ready for service – but at that time, technology and military strategy had already changed, and China had been developing the more capable (but much bigger) twin-engined Xian JH-7 fighter bomber for PLAAF and PLANAF. But it would still take some years until the JH-7A would enter service with the PLANAF: in early 2004, and with the PLAAF by the end of the year.

For China, the most important factor which prevented the Q-6 introduction into PLAAF and PLANAF service, was the 'discovery' of stealth features on the battlefield: variable-sweep wing would enlarge the aircraft's radar cross section multiple times and thus making it impossible to survive on the modern battlefield, because it would be much more likely to be detected and shot down.

Anyway, internal politics did not stop China from offering the now completed airframe on the export market as A-6 'Kong Yun' ("Cloud"), as a more capable successor to the Nanchang A-5 (the export version of the MiG-19-based Q-5). From 1992 onwards, several former A-5 users bought the aircraft as A-6 multi-role fighters. It is assumed that these correspond to the Q-6's development lines for PLAAAF an PLANAF.

Current users are the Bangladeshi Air Force (8× A-6B), Myanmar Air Force (20× A-6C), Sri Lanka (11× A-6B) Korean People's Air Force (probably less than 50x A-6A) and the Sudanese Air Force (A total of about 20, 3–11 of them servicable, probably all A-6A).
A-6A ('Fruitcase A'):
The first version and despite being marketed as a "multi-role combat aircraft" a very simple variant with a small radome, probably containing a Type 226 pulse-Doppler radar (a Chinese copy of the GEC-Marconi Skyranger).
A-6B ('Fruitcase B'):
Similar in apperance to the A-6A with a bigger radome. This variant is equipped with a Chinese KLJ-6E pulse-Doppler radar (A Chinese copy of the Italian Pointer-2500 radar, the same as featured on the Chinese Q-5M Fantan attack aircraft), which gives all weather attack capability. These aircraft are also fitted with a HUD, a GPS receiver/inertial navigation system, a 360° radar warning system, a tactical radio navigation system and chaff/flare dispensers on the rear fuselage.
The Sri Lanka aircraft have been seen carrying an external FLIR pod on one of the underfuselage pylons, while the Bangladeshi Air Force aircraft exclusively feature a small fairing under the nose which is believed to contain a LR/MTS, allowing the deployment of PGM.
A-6C ('Fruitcase C'):
Dedicated ground attack variant with a solid, more slender nose and full PGM capability. The nose features a fairing with windows for an ALR-1 laser rangefinder/marked target seeker (LR/MTS) in a small ball turret, and possibly LLLTV/FLIR. This optical system offers day/night attack capability. Like the A-6B, these aircraft feature HUD, GPS, tactical radio and optional flare dispensers.

General characteristics:
Crew: 1
Length: 56 ft 1 in (17.10 m)
Wingspan: 47 ft 2 in (14.4m) at 16°, 28 ft 6 in (8,7m) at 72°
Height: 15 ft 9.5 in (4.82 m)
Empty weight: 16.520 lb (7.500 kg)
Loaded weight: 28.370 lb (12.880 kg)
Max. take-off weight: 32.820 lb (14.900 kg)

Powerplant:
1× Xian WS-9 Qin Ling afterburning turbofan (a license-built Rolls Royce RB.168 Spey Mk. 202), rated at 54,6 kN (5.562kp) dry and at 91,3KN (9.305kp) at full afterburner

Performance:
Maximum speed: Mach 1.2 at low altitude and in clean configuration, subsonic with external ordnance; 1.055mph (1.700 km/h) at height and in clean configuration
Combat radius: 485 nmi (560 mi, 900 km)
Service ceiling: 49.180 ft (15.000 m)

Armament:
2× Type 23-III twin-barreled 23mm cannons in the wing roots with 200 RPG
7× Hardpoints (three under the fuselage, one under each fixed wing root and the mobile outer wings) for a maximum external ordnance of 10.000 lbs (4.540kg), including guided and unguided bombs, missiles, napalm tanks or 800l drop tanks; the two hardpoints under the outer wings are fixed and can only be used when the wings are kept in the most forward position (they are normally only used for drop tanks in ferry configuration).