The conclusion of my post here:
https://www.alternatehistory.com/fo...mann-and-isayyo2.523009/page-12#post-23837047
The History of the Avro Canada CF-105 Arrow, Part II (Service History, Variants)
The Debut of the Arrow marked a new era of collaboration and cooperation between members of the Commonwealth of Nations, starting with the Central Commonwealth members. Individually, each member of the Commonwealth was nowhere near the strength and influence of the United States and the Soviet Union, but together, the Commonwealth would be heard on the world stage.
While the Intercontinental Ballistic Missile became the primary nuclear threat, Soviet bombers continued to test the resolve of the Western Bloc. In joint exercises, the Arrow proved surprisingly agile for its size. While it would never out-rate a dogfighter, the Arrow could hold its own against other interceptors and some fighter-bombers. Given the original intent as a high-speed interceptor, its missile armament was respectable, though military engineers and officers noted that the Arrow could benefit from additional external hardpoints for additional air-to-air and air-to-ground munitions.
With the Arrow entering service as a viable combat aircraft, engineers across the Commonwealth and other partners began to seek ways to improve the aircraft. Even as the first Mark IIs left the assembly lines and were being prepared for delivery, work on the next version already commenced. The Mk.III was developed in the early 1960s following the debut of the McDonnell Douglas F-4 Phantom II. In a sign of things to come, the Mk.III variant would see drastic changes to the Arrow, inside and outside. As the West and Eastern Blocs began to mass ICBMs and nuclear bombers, the need for versatility over dedicated interception saw the new version of the Arrow continue the trend of making the aircraft better suited for more than intercepting bombers.
The most visible change was the replacement of the angular canopy with a bubble-style canopy; this sacrificed high-speed performance for a significantly improved field of view for the pilot. The tail was also larger, improving the Arrow's flight handling and maneuverability. Rounding out the major external changes, the Mk.III Arrow was fitted with small bulges on either side of the forward fuselage to accommodate two 20mm M39 cannons. While some RCAF officers believed that missiles made the dogfight obsolete, many others believed that while missile technology has matured, there could be times when the aircraft needed to defend itself at close range. The bulges and integral cannons again sacrificed some of the aircraft's performance as an interceptor but allowed the aircraft to defend itself within visual range. The avionics and flight systems were given iterative upgrades and improvements inside the aircraft. While NATO and Commonwealth members generally used the same avionics suite, some modularity allowed some customers to use their own indigenous systems.
By late 1962, the first Mk.III were nearly ready for delivery to the RCAF and would be initially assigned to squadrons based in Europe. The remaining unfulfilled Mark II orders would be converted to the Mk.III, as the need for dedicated interceptors continued to decline. Many of the older Mark IIs from the RCAF and RAF would be returned to Avro Canada or Hawker Siddeley factories. Some would be converted into trainer aircraft, which were designated as the CF-105 Mk.II(T), with many of these delivered to training squadrons of the major Arrow operators. Others would be prepared for export, as several nations became interested in second-hand Arrow Mark IIs. All rebuilt Mark IIs had been given the option of being retrofitted with a rounded canopy similar to the one used on the Mirage III, with the option of adding a 20 mm cannon for additional cost.
By 1963, India would be granted the license to manufacture their own production Arrows, with Orenda and Rolls Royce establishing a plant in India to manufacture and service the Iroquois turbojets for India and Australia, though soon other operators would use these facilities. However, they had to source an alternate radar and some other avionics due to concerns over the US blocking the sale of the Hughes fire control systems. India would instead implement the slightly older Cyrano RA 423, which would soon prove itself aboard Israeli Mirage IIIs. As a result, they would be designed Mark IIIAs, to differentiate from the standard variant equipped with the Hughes fire control units.
In 1964, the Coalition intervention in Vietnam began with the amphibious landings at Vinh. During combat for the next three years, the Arrows operated by the RCAF, RAF, and RAAF would see extensive service where its strengths and weaknesses were found. Issues with the AIM-7 Sparrows led to emergency work to correct their poor success rates. Older Mark IIs were found to be less ideal for engaging North Vietnamese MiGs, and most would be relegated to fighter-bomber duties or to escort high-speed bombers like the Avro Vulcan. The Arrows, while having respectable payloads thanks to the large internal weapons bays and wingtip missile rails, were outperformed by other aircraft with more external hardpoints. As a result, Canada would order CF-4 Phantom IIs as the new fighter bomber for the RCAF, largely relegating the Arrow to its primary roles as an interceptor and air superiority fighter.
Despite this, the Arrows saw an impressive kill-to-loss ratio, especially as Arrows fitted with the 20 mm guns were more prepared to engage targets within visual range as a last resort. Commonwealth aircraft worked closely with AWACS and IFF; they were not restricted to requiring visual identification, allowing most Arrows to fire missiles at range instead of trying to dogfight more agile opponents. By the end of the war, veteran pilots would be sent to Avro Canada for extensive debriefings, discussing what could be improved for the next generation of Arrows. Yet even as Vietnam was embroiled in war, developments in the Middle East also would influence the Arrow program.
In late 1965, Israel was surrounded by hostile neighbours, all fully aligned with the Soviet Union. Thus the Israelis would purchase 24 Arrow Mark IIs (partially paid via donations from private interests and the US DoD to counter the Soviet-backed Arabs), and would also purchase 48 Mirage IIIOCJs, based on the Australian Mirage IIIs with the Orenda Iroquois engine. The Israelis had ordered their Arrows with some systems not fitted, allowing them to install their own. This led to the Israeli units being designed the Mk.IIB. The Israeli order would lead to intrigue, as the Israelis had been talking with the Jordanian government-in-exile under King Hussein, and through the 60s, secret agreements between King Hussein and the Israeli government were made. Israel promised to support the restoration of the Hashemite dynasty, endorsed by NATO members as a way to break the Soviet hold over the Arabian peninsula. During the 60s, Jordanian Royalist pilots were allowed to train aboard the Arrow in Canada and the UK, and tentative agreements were made between Avro Canada and King Hussein.
In 1967, Israel launched the Six-Day War after the Soviet-backed Arab nations began to mass forces along the Israeli borders. The larger but fewer Arrows (named the Hetz in Israeli service) complemented the Mirage IIIOCJs, patrolling the skies for any Arab aircraft that survived Operation Focus. As it became clear that most of the opposing air forces were wiped out, the Arrows delivered airstrikes, their ability to carry a massive payload of bombs helping take out enemy positions and concentrations. While the war was brief, the utter humiliation of the Soviet-backed Arabs would have long-term implications. Cracks began to form, with the respective governments beginning to lose their tight control over their peoples, as well as their armed forces. Ultimately, a desire to restore control led to the gamble by the governments of Jordan, Egypt, and Syria to attack in 1971, following four years of crash rebuilding. The surprise attack ultimately failed and heralded their undoing; the Communist regime in Jordan rapidly fell to a Royalist coup in 1972 that saw the return of King Hussein. Consequently, this led to a major shift as parts of the Arab world decided to reconcile with Israel and helped establish a two-state solution with the Treaty of Asheville.
For Avro Canada, while Israel only had a handful of Arrows compared to the Mirages, their ability to dominate the skies and deliver heavy air strikes on Arab positions gained media attention, as well as more calls from various nations. The lessons from the Israelis would significantly impact the next generation of the venerable Canadian-designed aircraft.
In 1968, the Canadian Forces would see a slight reorganization to improve cooperation and standardization. While the three services maintained their separate identities, the defence staff was unified, along with aircraft designations. The rank structures, while not standardizing rank titles, were adjusted to maintain consistency across the three services, and some training programs were merged to reduce redundancies. The Original Arrow Mark II aircraft were redesignated the CF-105A, with rebuilt Mark II trainers becoming the CF-105B, and the Mark IIIs were now the CF-105C Arrows.
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In the early 1960s, Hughes Aircraft would purchase four surplus CF-105A/B aircraft as testbeds. Hughes would radically modify two Arrows to use an improved derivative of the AN/ASG-18 radar, which became the prototype of the AN/AWG-9. While the Arrow was too large and no serious plans were made for a carrier-based variant, the Arrow's performance with the weapon formed the benchmark of the US Navy's evaluation for a fleet interceptor. Ultimately, Hughes Aircraft's research and testing would lead to the F-14 Tomcat, which was slower than the Arrow but surprisingly agile for its size and could carry up to 6 AIM-54 Phoenix missiles. Yet, it also led to the next major variant of the Canadian-designed interceptor/fighter aircraft, though another project across the Atlantic would play a role.
Around the same time, the British were developing their own X-band Doppler radar for the P.1154 and P.1127 programs. Marconi-Elliott developed the new radar based on the FMICW project, originally designed for a new AEW carrier aircraft for the RN. To test the new radar, two older RAF Arrow Mk.II aircraft were used by Marconi, with engineers working out bugs and issues within the prototypes. This would lead to modifications made that would allow the new Radar to recognize and interface with the Phoenix missile. The test flights would prove successful, and the early model of Foxhunter would see adoption on the new P.1154 Osprey and the Harrier "jump-jets." However, this would lead to both Hughes and Marconi becoming aware of their rival's project. By 1968, members of the Arrow Development program were already working on the next iteration of the aircraft, including the choice of radar and associated avionics. This led to what some news reporters dubbed the "Trans-Atlantic Arrow Rumble."
Over the next five years, Hughes and Marconi-Elliott would send their Arrows to participate in exercises around NATO and other Western-aligned nations. Hughes would take advantage of the large volume inside the Arrow to use a larger receiver, as well as work on adding ground-attack capabilities. Marconi-Elliot, having initially tested the smaller Foxhunter units meant for the jump jets on the Arrow, introduced a much larger radar as well as an experimental infrared search and track, and more curiously, an electro-optical camera system similar to the one carried by the upcoming F-14. During an experimental joint exercise among the Amigos in 1969, the rivalry continued between the Radar developers, demonstrating that both offerings were surprisingly similar in capabilities.
Both systems demonstrated outstanding radar range for fire control, outclassing anything else from NATO or the Warsaw Pact. In fact, the biggest limitation was that there was no air-to-air missile in the world that could fully utilize the radar range, both able to detect a fighter aircraft at well over 90 nautical miles. Both demonstrated the ability to track multiple targets as well as generate simultaneous firing solutions for BVR launches. The Hughes radar had a much longer maximum range (rumoured to reach up to 200 nautical miles), but the Foxhunter was a digital system, significantly reducing maintenance and probability of malfunctions, and allowing for further improvements to be made. At the inaugural Excercise RIMPAC in 1971, the Arrows would again be pitted against one another, along with the still brand-new F-14 Tomcats, whose surprising agility led to interest from Canada for the upcoming Commonwealth Carrier program. In 1972, the inaugural William Tell aerial gunnery competition would see the rival companies again send the Arrows out to demonstrate their capabilities. The competition proved to be surprisingly spirited yet civil, as choices would ultimately be made by a number of countries.
The Arrow Mk.IV, known in the RCAF as the CF-105D, would enter service in 1974. While previous variants could be fitted with bombs and early-generation ground-attack guided munitions, the Mk.IV was the first version fully designed as a multirole jet. Additional weapon hardpoints were fitted to the airframe and wings compared to earlier variants. It also featured some minor changes to the aircraft to further improve flight performance. But the biggest change was a universal mount for the radar and fire control avionics, allowing the choice of the Hughes AN/AWG-9 or the Marconi-Elliott Foxhunter AI.24-B to be fitted. Able to equip the latest avionics for both air-to-air and air-to-ground, the Mk.IV could carry the majority of contemporary NATO munitions, including the Canadian Wolf series of Air-to-surface weapons.
The Mk.IV was thus able to accommodate a number of radar sets, accommodating US restrictions on high-end systems. India could only choose Foxhunter but would be pleased to see the vast improvement in performance over the aged Cyrano radars in their Mark IIIA aircraft. For most operators, the brand new Foxhunter AI.24 radar was selected, after engineers made the system compatible with the latest missiles within the NATO arsenal. The Mk.IVs operated by Iran were fitted as standard with the Hughes AN/AWG-9(V)2, a version of the F-14 Tomcat's radar adapted for the Arrow.
The Mk.IV was also the first Arrow variant that could carry the brand new AIM-54 Phoenix missile, with two carried internally and two mounted on hardpoints under the wing. The CF-105D became the backbone of Canada's NORAD operations and would be regularly seen intercepting Soviet bombers probing Canadian and American airspace. Among the launch customers of the Arrow Mk.IV was Jordan, who acquired 36 of the new Arrows, forming the core of the reborn Royal Jordanian Air Force. The Israeli Air Force would also procure a limited run of the Arrow Mk.IV as the Hetz II, supplementing the IAI Kfir, a development of the Mirage 5 which took in lessons from the Mirage IIIs.
The Mk. V, known as the CF-105E in RCAF service, would in many ways become the zenith for the Arrow lineage. In a major change from the older variants, the Mark V would replace the venerable PS.13 Iroquois turbojet engines with the Rolls-Royce Orenda Turbofan, shared with the CF-111. The Mk. V would also be fitted with conformal fuel tanks, further extending the aircraft's endurance. As a result, the aircraft was much longer-legged than even the Mk.IVs, but further reduced the maximum speed of the aircraft. Debuting in 1985, the ultimate variant of the Arrow became the first aircraft certified to use the brand-new AIM-120 AMRAAM. Like the abortive Sparrow II, the AMRAAM was an active radar homing missile, with the same length, though thinner and lighter. The new missile would be paired with an improved AI.24-C Foxhunter radar system, based on the system used on the Tornado ADV. A subvariant of the Mk.V, designed Mk.VG (or CF-105DG) had additional avionics that allowed the aircraft to use the AGM-88 HARM and ALARM anti-radar missiles, allowing for effective SEAD operations.
A more significant derivative of the Mk. V was the Mark VI (CF-105F) Sea Arrows, used by the Canadian and Royal Navy Fleet Air Arms. The Mk.VI was optimized for anti-ship duties and thus carried Harpoon anti-ship missiles and many standoff weapons. They too could carry anti-radiation missiles, but their focus was to neutralize enemy warships and interdict amphibious assaults.
The Middle East War would be one of the final conflicts for the Cold War era design, and become one of many symbols of cooperation among the nations that fought the Turks, Saudis and Baathists. The Royal Canadian Air Force, Royal Air Force, Royal Australian Air Force, Indian Air Force, Imperial Iranian Air Force, the Israeli Air Force, and the Royal Jordanian Air Force would deploy their Arrows en masse to dominate the skies and attack opposing positions. CF-105F Arrows of the Canadian Fleet Air Arm along with the Arrow Mk.VIs of the Royal Navy Fleet Air Arm would join Allied anti-surface operations, clearing the seas for the Allied navies. They would play a decisive role in the Naval Battle of Cyprus, supporting the French Navy and allied forces in sinking the Turkish amphibious fleet as it attempted to land on Cyprus. The Canadians would also deploy CF-105F Sea Arrows from Iran to patrol the Persian Gulf, looking for remnants of the Iraqi and Saudi navies.
The Mark V and Mark VI would remain in Canadian Service into the new millennium, with both variants finally seeing retirement in the 2000s. The Canadian Fleet Air Arm would retain their fleet of CF-14 Tomcats until the late 2010s, which would be replaced by the Naval variant of the Eurofighter Typhoon, carrying the potent CAPTOR radar, itself descended from the Arrow-specific Foxhunter radar. The Arrow would be succeeded by the Lockheed Martin/Avro Canada CF-22 Raptor, which many considered a worthy successor as well as a symbol of the strong ties between Canada and the United States. However, the Arrow would continue to see some service with several nations into the 2020s.