Vickers Type 758

Vickers-Armstrongs

Industry	Aerospace, Defence
Headquarters	Weybridge , United Kingdom
Products	Aircraft manufacturing (including Vickers Valiant bomber)

Overview

The Vickers Valiant was a British jet-powered bomber designed for high-altitude operations and nuclear weapon delivery. During the 1950s and 1960s, it formed a key element of the Royal Air Force's strategic deterrent known as the "V bomber" force. Developed by Vickers-Armstrongs in response to the Specification B.35/46 issued by the Air Ministry for a nuclear-capable jet bomber, the Valiant was the first of the trio of V bombers to enter service, preceding both the Handley Page Victor and the Avro Vulcan. Notably, it remains the sole V bomber to have deployed live nuclear weapons during testing.

In 1956, Valiants based in Malta conducted conventional bombing sorties over Egypt as part of Operation Musketeer amid the Suez Crisis. From that year until early 1966, their primary role was nuclear deterrence during the Cold War standoff between NATO and Warsaw Pact forces. Additional squadrons operated in capacities such as aerial refuelling, aerial reconnaissance, and Electronic Warfare.

By 1962, due to improvements in Soviet surface-to-air missile (SAM) systems, the entire V-force—including the Valiant—shifted tactics from high-altitude missions to low-level flight profiles to reduce vulnerability to SAM attacks. However, in 1964, structural issues were identified involving fatigue and crystalline corrosion in the wing rear spar attachment forgings of the Valiant. This problem was linked to a zinc-magnesium aluminium alloy (DTD 683) developed during World War II for high-strength applications but later found to be prone to fatigue cracking under extended use.

Although repair efforts commenced in late 1964, a change in government led Defence Minister Denis Healey to order the retirement of the Valiant early in 1965. Meanwhile, its sister V-bombers—the Victor and Vulcan—continued operational service into the 1980s.

Origins and early context

In November 1944, the Joint Technical Warfare Committee, alongside a separate panel led by Sir Henry Tizard, evaluated the prospective capabilities of "weapons of war." The resulting Tizard Report, published on 3 July 1945, outlined specific strategic directives for the Royal Air Force (RAF) Bomber Command. Following the conclusion of the Second World War, the strategy of deploying heavy four-engine bombers for large-scale bombing missions persisted into the early postwar years. During this period, the Avro Lincoln, an enhanced model of the Avro Lancaster, served as the RAF’s principal bomber. In 1946, the Air Staff released Operational Requirements OR229 and OR230, calling for the development of heavy bombers powered by turbojet engines. These bombers were intended to carry nuclear weapons at high altitudes and speeds without defensive armaments, functioning primarily as a deterrent against adversaries and, if deterrence failed, executing nuclear strikes. Concurrently, Britain embarked on its own program to develop atomic weapons.

In January 1947, the British Air Ministry issued Specification B.35/46 for a cutting-edge jet bomber designed to transport nuclear armaments at near-supersonic speeds and operate at altitudes around 50,000 ft (15,000 m). Three companies—A.V. Roe, Handley-Page, and Vickers-Armstrongs—submitted advanced proposals meeting these demanding criteria. Although Short Brothers presented a design by Geoffrey T. R. Hill, it was deemed overly ambitious; however, the Air Staff accepted another Short proposal for a different requirement, B.14/46, as a contingency should difficulties arise with B.35/46. Aviation experts Bill Gunston and Peter Gilchrist characterized Specification B.14/46 as seeking "little more than a traditional aircraft fitted with jet engines." To fulfill this specification, Short produced a conservative design that became the S.A.4 Sperrin. Two prototypes were built, with the first undertaking its maiden flight in 1951; nevertheless, the Sperrin was ultimately limited to research and development roles.

Emerging from World War II as a leading force in aeronautical manufacturing and innovation, Vickers operated a confidential development unit based in Weybridge, Surrey—akin to a secretive "Skunk Works"—which had participated in several classified wartime projects. This division undertook the initial development of what would become the Valiant bomber, including assembling its first two prototypes. Initially, Vickers proposed a six-engine jet bomber design to satisfy Specification B.35/46; however, advances in jet engine power led to revising this concept into a four-engine design by 1948. Compared to rival submissions, Vickers’ proposal was relatively straightforward and less aerodynamically sophisticated.

Both Handley-Page and Avro developed advanced bombers for this competition—the Victor and the Vulcan, respectively. The Air Staff decided to award contracts to all three manufacturers as a precautionary measure should any single design encounter difficulties. These aircraft collectively became known as the V bombers or V-class bombers, each bearing names starting with "V." Initially, Vickers’ entry was rejected for lacking the advanced features found in the Victor and Vulcan designs; however, Vickers’ chief designer George Edwards actively lobbied the Air Ministry by emphasizing that his design would be operational sooner than competitors’. He pledged that a prototype would fly before the end of 1951, production models would be airborne prior to late 1953, and serial deliveries would commence early in 1955. Securing this contract was vital for Vickers’ future in aircraft manufacturing. Edwards displayed strong confidence that their Weybridge team could deliver on these promises without compromising specifications or altering equipment to match competitors’ performance metrics, resisting pressures that might delay delivery.

Although developing three distinct aircraft types under one Operational Requirement (OR) was expensive, geopolitical events such as the Berlin Blockade heightened urgency to establish an effective deterrent against potential Soviet aggression in Western Europe.

In April 1948, Specification B.9/48 was issued by the Air Staff based on Vickers’ Type 660 design; an 'Instruction to Proceed' was granted to Vickers on 16 April 1948.

By February 1949, two prototypes of the Vickers 660 series had been commissioned: one equipped with four Rolls-Royce RA.3 Avon turbojet engines and another fitted with four Armstrong Siddeley Sapphire engines designated as Type 667.

Prototypes

First prototype displayed at the Farnborough Airshow, 1951

The initial prototype, bearing the serial number WB210, completed its inaugural flight on 18 May 1951, meeting the deadline promised by George Edwards, just 27 months after contract initiation. This occurred several months ahead of the competing Short Sperrin, which featured straight wings rather than swept ones and ultimately did not receive an order. The Valiant’s first flight was piloted by Captain Joseph "Mutt" Summers, who had also been the original test pilot for the Supermarine Spitfire and sought to add another milestone before retiring. His co-pilot was Gabe "Jock" Bryce, who took over as Vickers' chief test pilot following Summers' retirement shortly thereafter. In June, the aircraft was officially named "Valiant," reusing a designation previously assigned to the Vickers Type 131 biplane from 1931. The name was chosen through a poll among Vickers employees.

The first prototype was lost on 11 January 1952 during internal noise measurement trials for the V.1000 programme. Testing procedures included engine shutdowns and restarts, one of which resulted in a fire in the starboard wing; most crew members escaped safely except for the co-pilot, who suffered fatal injuries after striking the tail section during ejection.

Following modifications to the fuel system, the second prototype WB215 conducted its first flight on 11 April 1952. This version was equipped with more powerful RA.7 Avon engines producing 7,500 pounds-force (33 kN) thrust each instead of the initially planned Sapphires. Additionally, it featured redesigned air intakes—more rounded compared to the narrow slot-type intakes on the first prototype—to supply adequate airflow for these stronger engines. The brief interval before this second prototype’s availability ensured that development timelines remained unaffected despite the loss of the first.

The Valiant B2

Among the three prototypes was the B.2 variant. Designed as a Pathfinder aircraft, it operated at low altitudes to designate targets for the main bomber fleet. To withstand increased turbulence encountered at these lower levels, its airframe was reinforced. Specifically, structural cut-outs in the wings—originally designed to accommodate main wheel retraction—were eliminated to create an uninterrupted torsion box structure that also allowed for expanded internal fuel capacity. Instead of retracting into wing cut-outs like the B.1’s two-wheel main gear, the B.2’s four-wheel main landing gear folded backward into large fairings located at the rear of each wing. The fuselage was extended to a total length of 112 ft 9 in (34.37 m), compared with 108 ft 3 in (32.99 m) for the B.1 model; this additional length accommodated more avionics equipment.

The B.2 prototype with serial number WJ954 first took flight on 4 September 1953. Painted in a glossy black scheme suited for night missions, it earned the nickname "Black Bomber." Its low-level performance surpassed that of both the B.1 and other V-bombers, achieving clearance for speeds up to 580 mph (930 km/h) at low altitude and reaching speeds as high as 640 mph (1,030 km/h) during testing—significantly faster than the B.1’s sea-level limit of 414 mph (665 km/h). Although the Air Ministry placed an order for seventeen production B.2 aircraft powered by Rolls-Royce Conway turbofan engines, development was discontinued because the World War II-era "Pathfinder concept" was deemed outdated in nuclear warfare strategy. The prototype was subsequently employed in various trials including rocket-assisted takeoffs using two Super-Sprite motors to enhance performance at hot or high-altitude airfields for the B.1 variant. It also participated in extensive taxi tests aimed at diagnosing brake judder issues that led to landing gear fatigue failures before being scrapped in 1958.

Production

Valiant B(PR)K.1 WZ393 of 90 Squadron in original all-metal finish displaying at Blackpool Squires Gate airport in 1957

In April 1951, the Ministry of Supply placed an initial order for 25 Valiant B.1 (Bomber Mark 1) aircraft on behalf of the RAF. This early procurement was crucial for accelerating the manufacturing process. Due to limited availability of steel and other materials during the establishment of the production line at Brooklands, many of the Valiant's assembly jigs were constructed using concrete instead of traditional metals. The first five units produced adhered to a pre-production specification, with WP199 being the initial aircraft. The first flight of a production-standard Valiant took place on 21 December 1953, meeting the timeline commitments previously outlined by Edwards.

The RAF received its first production Valiant on 8 February 1955, marking the official operational debut of Britain's "V-bomber" force—a designation coined in October 1952. Subsequently, the Victor and Vulcan bombers joined the Valiant, completing the trio of nuclear-capable strategic bombers serving with the RAF. Production concluded in September 1957 with the delivery of the final Valiant, all completed within budget and schedule constraints.

A total of 108 Valiants were built, which includes a single B.2 prototype. Primarily serving as part of Britain's nuclear deterrent, these bombers also conducted conventional bombing missions using high explosive ordnance. Variants included a strategic reconnaissance model and a versatile version capable of conventional bombing, aerial reconnaissance, and air-to-air refuelling roles. Eighteen Squadron operated six Valiants equipped with electronic countermeasure systems. The 90 and 214 Squadrons utilized modified Valiants fitted with Hose Drum Units (HDU) installed in the bomb bay for air refuelling duties; this configuration required opening the bomb-bay doors to deploy the refuelling hose, contrasting with later tankers where HDUs were integrated flush beneath the fuselage. Additionally, several Valiants served as flying test platforms, notably during trials of the Blue Steel nuclear-armed standoff missile, which was subsequently incorporated into the armament of other V-bombers.

Unlike its counterparts—the Vulcan and Victor—the Valiant never advanced to a Mark 2 production model. In 1962, to evade enemy Surface-to-Air Missile defenses, Valiant squadrons shifted to low-level flight operations. However, this change led to structural fatigue from increased turbulence exposure, resulting in an early withdrawal from service by 1964. Aviation historian Vic Flintham noted the irony that despite Vickers having developed a Type 673 B Mk 2 variant designed as a fast low-level pathfinder, it failed to gain approval from the Air Ministry. The Valiant represented Vickers' final purpose-designed military aircraft before transitioning to civilian projects such as the Vanguard turboprop airliner introduced in 1959 and the VC10 jet airliner in 1962, which also saw use as an RAF transport and tanker aircraft.

Design

Forward perspective of preserved Vickers Valiant XD818 at the Royal Air Force Museum Midlands

The Valiant was developed using established aeronautical principles without relying on experimental aerodynamic concepts that would have required validation through scaled prototypes or extended research efforts. Consequently, George Edwards characterized the aircraft as somewhat "unexciting."

Featuring a shoulder-mounted wing, the Valiant was equipped with four Rolls-Royce Avon RA.3 turbojet engines, each capable of delivering up to 6,500 pounds-force (29 kN) of thrust. These engines were mounted in pairs within fireproof compartments embedded in the wing roots. The aircraft's design presented a sleek profile with swept-wing aerodynamics. The wing root had a thickness-to-chord ratio of 12%, allowing the Avon engines to be integrated within the wing structure rather than mounted externally on pods as seen in contemporaries like the Boeing B-47. This approach to "buried engine" installation enhanced aerodynamic efficiency but complicated maintenance access and increased the risk of adjacent engine damage in case of an uncontained failure. Additionally, it necessitated a complex main spar design routed around the engines.

The wing incorporated a "compound sweep" layout, a concept developed by Vickers aerodynamicist Elfyn Richards. Richards identified the need for greater sweep on the inner wing sections, later patented as "Improvements in Aeroplane Wing Formation," aimed at delaying shockwave formation uniformly across the wing span. The Valiant’s wing featured a 37° sweepback on the inner third and 21° on the outer two-thirds. This arrangement was possible because the thickness-to-chord ratio decreased towards the wingtips. The relatively gentle sweep near control surfaces limited operational speeds to Mach 0.84, with typical cruise speeds around Mach 0.75 at altitudes up to 55,000 feet (17,000 m) when lightly loaded. The aircraft did not require a drogue parachute even when operating from runways as short as 6,000 feet (1,800 m).

Positioned high on the fuselage, the wing’s internal space was constrained by engine placement and main landing gear housing, limiting fuel capacity. The trailing edge featured two-section ailerons equipped with trim tabs; double-slotted flaps were situated inboard of these ailerons. Flap and landing gear actuation utilized direct electrical motors exclusively. Only steering and braking systems employed hydraulics powered by electric motors driving hydraulic pumps rather than mechanical linkages.

Wing root section and air intakes

Production variants operated with four Avon 201 turbojets producing 9,500 pounds-force (42 kN) thrust each. These engines supplied bleed air for pressurization, ice protection systems, and cabin air conditioning. Electrical generators driven by these engines provided DC power for onboard systems. Napier Spraymat electric heaters were installed within engine intakes to prevent ice buildup that could detach and damage engines. Initial prototypes featured long rectangular intake slots; production models adopted oval or “spectacle” shaped intakes designed to accommodate increased airflow for more powerful engines. Exhaust gases exited through fairings located above the wing trailing edges.

To meet takeoff requirements from short tropical dispersal sites, jettisonable rocket-assisted takeoff (RATO) units were developed for use with the Valiant. Testing involved two underwing de Havilland Sprite boosters; however, these boosters became redundant once higher-thrust Avon variants were introduced. Moreover, asymmetric thrust resulting from booster failure posed safety concerns during takeoff. Some engines incorporated water injection systems that enhanced takeoff thrust by approximately 1,000 pounds-force (4.4 kN) per engine.

The crew operated from a pressurized compartment located in the forward fuselage comprising a pilot, co-pilot, two navigators, and an air signaller (later termed air electronics officer). Saunders-Roe was contracted to manufacture this pressurized section. The pilot and co-pilot sat side by side on an upper tier, while the other three crew members occupied stations lower down facing aft. The crew complement was reduced to five following elimination of defensive gun turrets and gunners—a combat approach validated by the World War II De Havilland Mosquito bomber. Egress for pilot and co-pilot was via Martin-Baker Mk.3 ejection seats; rear crew had to exit through an oval door on the port side fuselage—a method considered unsafe for emergency escape.

Side entry door of forward fuselage displaying pilot Kenneth Hubbard’s crew names

Behind the pressurized crew compartment yet ahead of the wing box was space allocated for avionics equipment and environmental control systems—often referred to as the “organ loft.” The aircraft featured twin-wheel nose landing gear and tandem-wheel main gear assemblies that retracted outward into recesses beneath each wing. Each main gear unit incorporated multipad anti-skid disc brakes linked telescopically so a single motor could retract them into their bays. Most mechanical systems including flaps and landing gear were electrically actuated. Braking and steering functions utilized electric motors powering hydraulic pumps rather than direct mechanical drives. The lower nose housed an H2S radar scanner within a glass-fiber radome; beneath this was a visual bomb sight located under the cockpit floor. Access to avionics was provided via an entrance at the rear fuselage base leading through an internal catwalk above the aft bomb bay section; no direct access existed from the cockpit.

Electrical power systems included four engine-driven DC generators producing 112 volts for high-demand functions; a separate low-voltage system at 28 volts operated actuators controlling higher voltage components. Backup power was supplied by batteries rated at both 24 volts and 96 volts. Additionally, a three-phase alternating current supply at approximately115 volts powered radar units along with actuators managing flight controls such as flaps, air brakes, and landing gear. The design philosophy emphasized maximizing electrical actuation over hydraulic systems due to weight savings achieved by eliminating pumps, fluid lines, actuators, reservoirs and associated components.

Flight controls—ailerons, elevators, rudder—were configured with dual-channel power assistance plus full manual backup operation; manual flying was regularly practiced during training in case of total electrical failure during missions. Manual control required significant physical exertion. Artificial feel feedback for pilot controls was generated using ram-air pressure sources integrated into control linkages.

The aircraft included Smith Aerospace autopilot systems alongside instrument landing system (ILS) capabilities complemented by various navigational aids such as Marconi Green Satin Doppler radar, Gee radio navigation system, Automatic Direction Finder (ADF), VOR/DME stations support as well as radar altimeters. Provisions existed for future installation of additional sensors like side-looking airborne radar equipment.

Landing gear assembly and wing

Within its central fuselage section, a robust main backbone beam supported two widely spaced wing spars along with five upper fuselage fuel cells; below this structure resided the bomb bay area. The rear fuselage employed a semi-monocoque framework lighter than that of the center section; electro-hydraulic power units for control surfaces such as ailerons,elevators,and rudder were housed here—these units were manufactured by Boulton-Paul Aircraft. Unlike swept tail designs common elsewhere,the tail assembly tapered rather than swept back, with its horizontal stabilizer mounted high on the vertical fin to avoid engine exhaust interference. A tail warning radar unit ARI5800 Orange Putter was installed within the tailcone area.

Key structural components including spars and beams were fabricated from DTD683—a zinc-magnesium-copper aluminium alloy developed in Britain. The aircraft followed a 'Safe-Life' design philosophy; however,this combination of material choice with Safe-Life methodology later proved problematic. A Journal of Institute of Metals publication from1956 condemned DTD683 as unstable under plastic strain and fatigue conditions near design stress limits, while Lockheed engineers publicly criticized Safe-Life approaches at Royal Aeronautical Society meetings in1956 for failing to assure protection against catastrophic failure under operational stresses. Initially, Valiants were assigned to strategic nuclear bombing missions alongside Vulcan and Victor B.1 bombers once they entered service. At its operational zenith, ten RAF squadrons operated the Valiant.

Gunston and Gilchrist noted that the Valiant performed "extremely well" in the annual bombing contests organized by the American Strategic Air Command (SAC). This success attracted USAF generals such as Vandenberg, Johnson, and LeMay to visit Vickers. Test pilot Brian Trubshaw suggested that George Edwards faced some pressure to produce the Boeing B-47 under license. The sole outcome of this visit was LeMay’s insistence that the side-by-side cockpit seating arrangement of the Valiant be adopted in the B-52 design instead of the tandem seating used in both the B-47 and early B-52 prototypes.

On 11 October 1956, Valiant B.1 WZ366 from No. 49 Squadron executed the first British live atomic bomb drop during the Buffalo R3/Kite test

On 11 October 1956, a Valiant B.1 (WZ366) belonging to No. 49 Squadron and piloted by Edwin Flavell became the first British aircraft to release an atomic bomb when it conducted a test drop of a reduced-yield Blue Danube device over Maralinga, South Australia. This operation was part of the Operation Buffalo nuclear trials in that region. To shield the crew from the intense nuclear flash, windscreen blinds were installed prior to the test. After completing the mission and landing, WZ366 underwent inspections for possible damage and radioactive contamination.

On 15 May 1957, during Operation Grapple, a Valiant B(K).1 (XD818), flown by Kenneth Hubbard, dropped Britain's first hydrogen bomb—the Short Granite—over the Pacific Ocean. No. 49 Squadron was chosen to conduct this live weapon delivery and operated specially modified Valiants equipped to meet scientific testing requirements and protective measures against heat and radiation. Although a thermonuclear detonation was achieved, its yield measured less than one-third of what was anticipated.

On 8 November 1957, a British hydrogen bomb detonated with its intended yield during the Grapple X test. The Grapple series extended into early 1958; in April of that year, the Grapple Y device exploded with a yield ten times greater than that of the original Short Granite. The British government ceased air-delivered nuclear testing in November 1958.

Initially, bombing missions were planned for high-altitude execution; however, after the downing of Gary Powers' Lockheed U-2 by an early Soviet SA-2 Guideline missile in 1960, bomber squadrons shifted training towards low-level penetration tactics to evade radar detection within hostile airspace. Consequently, aircraft were repainted from their original anti-flash white finish to grey/green camouflage with standard markings. By 1963, four squadrons operating Valiants—49, 148, 207, and 214—were assigned under SACEUR for low-level tactical bombing duties. By this stage in service life, flight activity rates for the type had noticeably declined.

Conventional warfare

Camouflaged Valiant at Filton, England. Circa mid-1960s

During peacetime, training exercises involved dropping small practice bombs on ranges equipped with instrumentation. Additionally, a predicted bombing method was employed using radio signals to indicate the bomb release point over targets outside designated ranges. Ground radar units calculated the bomb deviation and relayed this information either to the crew mid-flight or to command centers for further evaluation. The Valiant’s Navigational and Bombing System (NBS), combined with highly skilled crews—often experienced veterans decorated for previous wartime service—enabled bombing precision surpassing that of aircraft from the Second World War. Gunston and Gilchrist noted that crews could accurately deliver practice bombs from an altitude of 45,000 feet (14,000 m) within mere meters of their intended targets.

The Valiant was the first among the V-bombers to engage in combat during October and November 1956, taking part in the Anglo-French-Israeli Suez campaign. In Operation Musketeer, the British military action during the Suez Crisis, Valiants based at Luqa airfield in Malta executed conventional bombing raids on Egyptian objectives. Primary targets were Egyptian military airfields, alongside communication facilities such as radio stations and transportation centers. On the operation’s initial night, six Valiants were tasked with bombing Cairo West Air Base but aborted due to potential risks to American personnel nearby; simultaneously, six aircraft struck Almaza Air Base, while five others attacked Kibrit Air Base and Huckstep Barracks.

Despite no opposition from Egyptian forces and no combat losses among Valiants, the bombing outcomes were considered underwhelming. Although a total of 842 long tons (856 t) of bombs were dropped, only three out of seven targeted airfields sustained significant damage. The Egyptian Air Force had already been effectively neutralized through broader multinational strikes that included these Valiant missions. This marked the final combat deployment of RAF V-bombers until Avro Vulcans conducted bombing runs against Port Stanley airfield during the Falklands War in 1982.

Tanker operations

Valiant tanker aircraft were operated by No. 214 Squadron at RAF Marham, becoming active in 1958, and No. 90 Squadron based at Honington, which became operational in 1959. Both squadrons transitioned exclusively to tanker roles on 1 April 1962. Tanker-configured aircraft featured a Hose Drum Unit (HDU or "HooDoo") installed within the bomb bay. The HDU was attached using standard bomb-mount points and could be removed to restore the aircraft’s bomber capabilities if necessary; this setup required opening the bomb bay doors during fuel transfer operations. Control of the HDU was managed from a panel located at the radar navigator’s station in the cockpit.

Long-distance demonstration flights included in-flight refueling by other Valiant tankers positioned strategically along flight paths. In 1960, a Valiant bomber completed a nonstop flight from Marham in the United Kingdom to Singapore; similarly, in 1961 a Vulcan accomplished a nonstop journey from the UK to Australia. These two tanker squadrons frequently conducted extended-range flights such as nonstop trips from Britain to destinations including Nairobi, RAF Gan, and Singapore. During this period, Valiants also refueled other aircraft types such as Victor and Vulcan bombers, English Electric Lightning fighters, as well as Royal Navy fighters like the de Havilland Sea Vixen and Supermarine Scimitar.

Electronic countermeasures and reconnaissance duties

The Valiants operated by No. 18 Squadron RAF at RAF Finningley underwent conversion to fulfill the "radio countermeasures" (RCM) mission, which later became known as "electronic countermeasures" (ECM). These aircraft were equipped with American-made APT-16A and ALT-7 jamming transmitters, alongside Airborne Cigar and Carpet jamming systems, as well as APR-4 and APR-9 "sniffing" receivers, and chaff dispensers. At least seven Valiants were adapted for this specialized role.

Meanwhile, Valiants from No. 543 Squadron based at RAF Wyton were altered for photographic reconnaissance tasks. A significant mission in 1965 saw these aircraft capture imagery covering approximately 400,000 square miles (1,000,000 km²) of Rhodesia over an eleven-week timeframe.

Structural fatigue and withdrawal from service

In 1956, Vickers conducted a series of low-altitude high-speed tests using aircraft WZ383 to evaluate the Valiant’s suitability for such operations. Modifications included adding a metal radome and debris guards on the two inner engines; after six flights, the artificial feel of the ailerons and elevators was reduced by half. Pilots noted issues with cabin heating and condensation that required attention. The aircraft was outfitted with data recording instruments, enabling Vickers to estimate the aircraft's remaining safe operational life under these conditions. Initially, a safe operational limit of 75 hours was suggested, later revised to indicate the actual safe life might be under 200 hours. The annual flight hours logged by each Valiant became a significant operational consideration for the RAF.

Subsequently, the RAE performed similar testing that better simulated real-world conditions, including low-level flight and taxiing. Their 1958 report provided insights into which flight regimes inflicted the most structural wear, allowing for improved predictions of the aircraft's future lifespan.

In May 1957, Flight magazine reported an incident at Boscombe Down involving a rear wing spar crack following a rocket-assisted takeoff at overload weight—the very reason for using rocket assistance. This involved the second prototype WB 215, which had not yet received production modifications addressing a known rear spar vulnerability; after accumulating 489 flight hours, this aircraft was dismantled for wing fatigue analysis.

After extensive frontline deployment, in July 1964 a cracked spar was detected in one of three Valiants—either WZ394 (piloted by Wynne) or WZ389 (piloted by Morgan)—participating in Operation Pontifex. Shortly afterward, on 6 August, WP217, an Operational Conversion Unit aircraft from Gaydon captained by Flight Lieutenant "Taffy" Foreman, experienced failure of its starboard wing rear spar at 30,000 feet. Despite damage preventing flap deployment on that side due to flap roller dislodgement caused by the spar failure, the aircraft managed to return safely to base. Further examination revealed buckling of fuselage skin beneath the starboard inner wing, rivet failures, cracks in engine doors, and buckling of the upper mainplane skin between engines. Both involved airframes were photographic reconnaissance variants.

Fleet-wide inspections revealed wing spars exhibiting fatigue between 35% and 75% of their estimated safe fatigue life, likely accelerated by low-level turbulence exposure. Following these findings, aircraft were categorized into three groups: Category A allowed continued flying; Category B permitted flights only to repair facilities; Category C required repairs before further operation. Tanker squadrons had a higher proportion of Category A planes due to predominantly high-altitude missions. These developments prompted reassessment of fatigue life evaluation methods. By the time retirement occurred, approximately fifty Valiants remained active while others had been progressively stored at various RAF Maintenance Units as "Non effective Aircraft."

Initially, there was no plan to retire the fleet or most affected planes outright. Repairs were ongoing at bases like Marham with combined efforts from Vickers personnel and RAF technicians. However, in January 1965 the Wilson government—under Defence Secretary Denis Healey—determined that repair costs were unjustifiable given the limited remaining service life of the type; consequently, all Valiants were permanently grounded as of 26 January 1965. The Quick Reaction Alert (QRA) role supporting SACEUR remained active until this final grounding. When questioned in the House of Commons, Healey clarified that retirement was unrelated to low-level flying concerns and emphasized that the previous government had intended to operate the fleet for four years beyond its planned fatigue life.

Aviation historian Barry Jones remarked: "One must ask why Handley Page’s Hastings transports underwent complete overhaul with DTD683 components replaced by new alloys over two years while no similar refurbishment was applied to the Valiant? The answer remains elusive." A Flight report on scrapping noted that fatigue issues affected all Valiants—not solely those engaged in low-altitude operations.

On 9 December 1964, the final tanker mission flown by XD812 of 214 Squadron involved refuelling Lightning fighters over the North Sea but was cut short when recalled to Marham before exercise completion. That same day marked the last bomber sortie by XD818—an aircraft notable for having deployed nuclear weapons during Operation Grapple.

Variants

A total of 107 Valiants were produced, including the initial three prototypes.

• Valiant B.1: This model comprised 37 dedicated bomber aircraft, which included five pre-production units known as Type 600, Type 667, and Type 674. These early versions were equipped with Avon RA.14 engines, each delivering 9,500 pounds-force (42 kN) of thrust, matching the power of the earlier Avon 201. Additionally, there were 34 Type 706 full-production bombers powered by Avon RA.28, 204, or 205 engines producing 10,500 pounds-force (47 kN) thrust per engine. These later models featured extended tailpipes and incorporated water-methanol injection to enhance takeoff performance.
• Type 710 Valiant B(PR).1: Eleven aircraft configured for both bombing and photographic reconnaissance roles. From the outset, Edwards and his team envisioned the Valiant’s potential for photo-reconnaissance missions. This variant was designed to accommodate a removable "crate" within its bomb bay capable of housing up to eight narrow-angle, high-resolution cameras alongside four survey cameras.
• Type 733 Valiant B(PR)K.1: Fourteen units served in combined bomber, photo-reconnaissance, and tanker capacities.
• Type 758 Valiant B(K).1: Forty-four aircraft were built to fulfill bomber and tanker functions. Both tanker variants utilized a detachable refuelling system installed in the bomb bay that included fuel tanks and a hose-and-drogue aerial refuelling mechanism. An additional order for sixteen more B(K).1 tankers was placed but later cancelled.
• Valiant B.2: A single prototype was constructed.
• Vickers explored an air transport variant of the Valiant featuring a low-wing design with an increased wingspan from 114 feet 4 inches (34.85 m) to 140 feet (43 m), an extended fuselage lengthened to 146 feet (45 m), and more powerful engines. Development on this prototype, termed Type 1000, commenced in early 1953. This prototype was intended to pave the way for a military transport version (Type 1002) as well as a civilian transport variant (Type 1004 or VC.7). However, the nearly completed Type 1000 prototype project was ultimately discontinued.

Production of the Valiant ceased in August 1957. Furthermore, an order for seventeen B.2 models was cancelled.

Operators

Silhouette of the Valiant B.1

Template:UK

• The Royal Air Force operated the Valiant from several bases including RAF Gaydon, RAF Finningley, RAF Honington, RAF Marham, RAF Wittering, and RAF Wyton. Units equipped with the aircraft included:
  • No. 7 Squadron – Re-established at Honington on 1 November 1956, relocated to Wittering on 26 July 1960 before disbanding on 30 September 1962.
  • No. 18 Squadron – Formed by renumbering C Flight of No.199 Squadron at Finningley on 17 December 1958; disbanded on 31 March 1963.
  • No. 49 Squadron – Reactivated at Wittering on 1 May 1956, transferred to Marham on 26 June 1961, and disbanded on 1 May 1965.
  • No. 90 Squadron – Reformed at Honington on New Year’s Day in 1957; disbanded on 1 March 1965.
  • No.138 Squadron – Re-established at Gaydon on 1 January 1955, moved to Wittering by July that same year, then disbanded on April Fool’s Day in 1962.
  • No.148 Squadron – Reactivated at Marham on July 1, 1956; disbanded on May Day in 1965.
  • No.199 Squadron – C Flight received Valiants at Honington on May 29, 1957 for electronic countermeasures training replacing Avro Lincolns while remainder operated Canberras; squadron disbanded December 1958 with C Flight redesignated as No.18 Squadron.
  • No.207 Squadron – Reactivated at Marham on April Fools’ Day in ’56; ceased operations May Day ’65.
  • No.214 Squadron – Reformed at Marham early January ’56; disbanded March ’65.
  • No.543 Squadron – Reformed at Gaydon April ’55 for strategic reconnaissance role; transferred to Wyton November ’55; replaced grounded Valiants with Victor Mk Is in ’65.
  • No.232 Operational Conversion Unit RAF – Established at Gaydon February ’55 to train crews on Valiant operations; Victor training added in ’57; Valiant-equipped B flight disbanded February ’65.
  • No.1321 (Valiant/Blue Danube Trials) Flight

Accidents and incidents

• On 12 January 1952, the initial Valiant prototype WB210 was lost near Bransgore due to an in-flight fire.
• On 29 July 1955, Valiant B1 WP222 from No. 138 Squadron crashed during takeoff at RAF Wittering caused by an aileron failure, resulting in the deaths of all four crew members.
• On 11 May 1956, the Royal Aircraft Establishment's Valiant B1 WP202 crashed while attempting to land at Southwick Recreation Ground close to Hove in Sussex after losing control.
• On 13 September 1957, Valiant B(PR)K1 WZ398 of No. 543 Squadron caught fire inside a hangar at RAF Wyton and was subsequently not repaired.
• On 11 September 1959, Valiant BK1 XD869 belonging to No. 214 Squadron collided with the ground following a night takeoff from RAF Marham.
• On 12 August 1960, Valiant BK1 XD864 from No. 7 Squadron experienced a nosewheel retraction failure during takeoff at RAF Wittering; while addressing the issue, the aircraft stalled and crashed at the disused RAF Spanhoe airfield.
• On 11 July 1961, Valiant B1 WP205 operated by the Aircraft and Armament Experimental Establishment overshot the runway and struck a control caravan at Boscombe Down.
• On 3 November 1961, Valiant B(PR)K1 WZ399 of No. 543 Squadron aborted takeoff at Offutt AFB, Nebraska, caught fire after overrunning the runway and ending up on a railway track.
• On 14 March 1961, Valiant B1 WP200 stationed at RRFU Pershore failed to complete its takeoff and was declared a total loss.
• On 6 May 1964, Valiant B1 WZ363 from No. 148 Squadron, though operated by personnel from No. 207 Squadron, crashed during a night dive near Market Rasen, Lincolnshire.
• On 23 May 1964, Valiant B(PR)K1 WZ396 of No. 543 Squadron landed on foam due to landing gear complications at RAF Manston and was not repaired.

Surviving aircraft

Vickers Valiant B1 XD818, piloted by Kenneth Hubbard during Operation Grapple – displayed at the RAF Museum Cosford in 2006

• The sole complete surviving example is Vickers Valiant B1 XD818, exhibited at the Royal Air Force Museum Midlands located at RAF Cosford. It is featured alongside the other two V bombers—the Victor and Vulcan—within the National Cold War Exhibition. This aircraft represents the only fully preserved model of its kind, making Cosford unique as the venue displaying all three V bombers together.
• Cockpit sections remain from several aircraft: XD816 is preserved at the Brooklands Museum in Surrey; XD875 is exhibited at Morayvia, based at Kinloss. Additionally, cockpit section XD826 forms part of the collection at the Imperial War Museum Duxford in Cambridgeshire, while the flight deck of XD857 is showcased at the Norfolk and Suffolk Aviation Museum in Flixton, Suffolk.

Specifications (Valiant B.1)

See also

Bibliography

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External links

• Archival newsreel showcasing the Valiant after its 1955 Speed Record achievement
• Video footage and detailed overview of the Valiant B2 model
• Historical clips depicting RAF Valiant missions
• High Encounter documentary

• RAF Museum collection on the Vickers Valiant
• Comprehensive history of the Valiant aircraft