The Gloster Javelin was the world’s first twin-jet delta-wing fighter. It was the Royal Air Force’s best interceptor of the 1950s, and was almost brilliant. It did what it was asked to do. It was a large heavily armed (albeit subsonic), day-night all-weather fighter. Unfortunately, the opposition moved the goals by developing air-launched stand-off missiles, requiring the sort of high-speed interceptor performance that simply could not be delivered by the Javelin. We spoke to former Javelin pilot Peter Day to find out if it deserved its bad reputation.
“I joined the RAF Javelin ‘Force’ via an Operational Conversion Unit (OCU) in 1965 as a very young pilot with 248 all jet flying hours, as was the habit in those days, and arrived on the frontline in 1966 with an additional 60 hours divided between Javelin T Mk 3 and FAW Mk 9. These recollections are from a frenetic first tour based in Singapore but with frequent detachments to Butterworth in Malaysia, Borneo and ultimately Hong Kong. The role was effectively ‘Colonial Policing’ in the Tropics which as I rapidly discovered was a million miles (5880 nautical miles actually) away from night/all-weather high level air defence as taught on the OCU. I had to immediately get to grips with ISA +15 operations* in 80% humidity at low level over jungle and sea, with the occasional medium level dissimilar combat flight or transit to outstations, not to mention the ITCZ (Inter Tropical Conversion Zone) which conspired to provide dense cloud, rain and lighting at the most inconvenient moments. Quite a first tour education. I eventually flew 565 hours on three Javelin variants.”
“With due regard to Top Gun who probably learnt it from the Javelin, the use of airbrakes to embarrass an opponent in close combat, force a fly through or past or at least negate a guns solution was a well know party trick.”
*15 degrees warmer than International Standard Atmosphere for a given altitude
Which units were you with on the Javelin and when?
“No 228 OCU RAF Leuchars Dec 1965 – Apr 1966. No 60 Squadron RAF Tengah Apr 1966 – May 1968.”
How would you describe the Javelin in 3 words?
“Stable, controllable, effective.”
What was the best thing about it?
“Relative simplicity, if it started it would fly and the systems were robust and would usually work, mostly due to the considerable efforts of the groundcrew.”
And the worst?
“1950s design e.g. Sapphire engine, a quaint starting system of electrically fired cartridge initiated AVPIN, Wellington ‘bomb slips’ as undercarriage uplocks, the relative inaccessibility of most aircraft components – Gloster must have had shares in the panel screw makers. Finally there were flight envelope peculiarities due to the ‘delta’ configuration.”
“A complete box of Tiger Beer would fit into each gun magazine and be perfectly cooled after flight”
The Javelin has a bad reputation, is this deserved?
“It was routinely developed in line with contemporary knowledge, modified and updated by Mark in service to compete with ‘Warsaw Pact’ aircraft development, but as a 1950s night/all-weather bomber destroyer it was very effective. If pilot’s took liberties with the flight envelope, which in fairness was not very well described, bad things would happen e.g. at very low speed the elevator artificial feel system would command nose-down pitch, reminiscent of a recent Boeing ‘safety’ device, which was unhelpful in vertical manoeuvring demanding a large increase in pilot stick input to overcome which lead to looping being banned for all the wrong reasons. The ‘rolling ‘g’ limit’ was eventually discovered to be +2g at full aileron deflection.”
How would you rate the weapons effectiveness?
“The four Aden cannon cross-harmonised for tail intercept were very effective indeed and provided a great surprise fired air-into-air at high level during the OCU course accompanied by gun clatter, cordite smell and a flame enveloped upper wing. Air-to air gunnery on the flag was very hit and miss as the ‘cold war’ gun harmonisation did you no favours with a calculated ‘in-range’ bracket of 10yds, one hit was a triumph. The air-to-ground ‘sniping’ carried out towards the end of it’s career was usually very enthusiastic and very inaccurate.
The de Havilland Firestreak fitted from 1959 was an infra-red target seeker with an effective range of about 3km in a 30º tail cone in Northern Europe. In warmer climes the seeker head would follow anything but the desired target, sun, water reflection, moon on occasions but luckily the 4.5inch parachute flare which was the firing target for missile practice launches. My allocated Firestreak worked as advertised and the flare dropping Canberra crew didn’t get too excited but it did cost beer.
How would you rate the radar’s effectiveness?
The airborne radar AI17 was basic having developed from wartime radar technology. B/C scopes (range+azimuth, range+elevation) without PPI so relatively poor situational awareness unless very experienced. Intercepts without Ground Control were not in any way guaranteed and reliance on scan with some height/range clues made for a lot of ‘seat of the pants’ intercept geometry. “A peep is worth several sweeps” came into play a lot. Fighter lane operations were planned in the UK in the event of total GCI outage.
Operation at low level with ground clutter and high temperature/humidity rendered it a very fine art form indeed. Interestingly there was the capability to reproduce the ‘locked-on’ blip on the pilot’s collimator gunsight with an added horizon reference for close quarters identification operations. However, this could be inaccurate, misinterpreted and lead to some very unusual aircraft attitudes at very low level. Definitely used with enormous caution, mostly verbal from the back seat.”
What is the biggest myth/misunderstanding about the Javelin?
“It couldn’t turn. Thrust/weight ratio was 0.79 with a relatively low wing loading of 34 lb/sq ft (170 kg/m2) so with 4+g available it could corner high or low but at altitude it was very effective with reheat engaged.”
Was it well made?
“The airframe was pretty impervious – ‘boiler plate’ weighing 14 tonnes unfuelled. Some individual electrical components e.g. fuel contents sensors, radio aids and radar were frequently in need of attention due to poor waterproofing.”
Hunter versus Javelin: which cockpit would you choose to be in if they faced each other in a dogfight and why?
“Assuming my Hunter had the ‘shiny switches mod’ and it was a clear air mass then turning performance should win the day. There is some HOTAS in my Javelin and two-person cockpit helps with radar ranging and missile lock but I would have to see first and sneak round to 6 o’clock, so night or weather (NAW) preferred. Hunter for day, Javelin for NAW.”
“Very moderate at low level as relatively low power, low ‘g’ could not take advantage of the low wing loading. At altitude increased power and sufficient ‘g’ would produce quite a good turn but speed would be sacrificed.”
“Quite respectable at low level as the factors combine to produce quite a small radius, likewise at altitude.”
“Low level the engines will fly the airframe beyond the speed limit quite quickly which incidentally roughly coincides with maximum available tailplane angle so level flight cannot be maintained. At altitude using reheat acceleration from .7M to .93M is seconds not minutes, but drag e.g. underwing tanks or missiles are a considerable disadvantage low or high.”
“High level pretty good, low level very good but thirsty.”
“5400fpm S/L ISA”
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“As a 1954 era night/all weather bomber destroyer very good. In the colonial policing role it is difficult to answer as you’d have to interview the insurgents. But it certainly had loiter time and a heavy guns capability albeit inaccurate.
Quite what we were hoping to achieve with the aircraft in Hong Kong during the communist riots escapes me, but it was probably a statement of intent rather than a show of force against a particular threat.”
“It had a large cockpit with everything to hand and easy to operate EXCEPT the TMk3 emergency undercarriage release handle on the right sidewall behind your elbow. Considerable contortions were required to select down as happened one night on the OCU course much to the amusement of my ‘new’ navigator partner in the rear seat. The FAW Mk9 had no such secondary system hence the occasional asymmetric gear landing.”
What was your most notable mission?
“At the risk of overindulgence – two. Well they won’t be as notable as Mandy weeing into a bottle over the desert.
Staging from Tengah, Singapore to Kai Tak, Hong Kong via Labuan, Malaysia and Clark Field, Manila with a point of no return over the South China Sea on the last leg.
The Hong Kong trip was notable in that it had a nightstop on Labuan Island, a nightstop at Clark Field, Manila and then just over an hour and a half to Kai Tak, Hong Kong with no credible destination alternate other than the other side or end of the main runway and ‘mind the airliners’. The only available ‘crash’ diversion if Kai Tak became unusable was Sek Kong airfield in the New Territories which was a disused WWII airfield with no aids in a bowl in the hills used for Gurkha field regiment driver training. It therefore became a ‘point of no return’ operation from Clark to Kai Tak and once you descended you were going to Hong Kong, no weather alternate and no sensible ‘crash diversion’. During the subsequent week long detachment ‘flag waving’ no-notice practice diversions and low approaches were flown through the hills and over Sek Kong much to the chagrin of the driving instructors and alleged discomfiture of the driver trainees who could be seen taking avoiding action in all directions although I couldn’t possibly comment. Reports were received!
Leading a Diamond 9 formation as a junior pilot ‘lucky winner’.
The Diamond 9 is a personal thing only and frankly not reportable as it was absolutely routine as a last flight of the month event and the lucky junior pilot got to lead.”
How combat effective do you think it would have been?
“Very against Soviet era medium bombers at all altitudes Bison, Badger, Bear and Brewer where tail quarter missile attacks or ‘vis-ident’ to line astern guns were high probability kill options. More so in poor weather or at night when bomber awareness would be reduced.
In the Colonial Policing role it was fairly effective, the FAW 9(R) with 4 tanks had good range, heavy firepower and the afterburners lit with an audible bang which anecdotally frightened the dissidents.”
How did it compare with its Russian and American counterparts?
“The USA was embarking on a whirlwind development of the Century series clear airmass day interceptors to replace the F-86 Sabre; the F-102 Delta Dagger, F-104 Starfighter, F-105 Thunderchief, F-106 Delta Dart and eventually the F-4 Phantom. The direct competition in age and role were the Northrop F-89 Scorpion 1950 (2 crew, 2 engines, good radar, 6 cannon, A/A rockets and basic IR missiles) and F-101B Voodoo 1957 (2 crew, 2 engine, radar and data link GCI, 4 missiles).
The Scorpion was ‘clunky’, a very basic all-weather fighter with less performance than the Javelin but very similar radar and early IR missile performance.
The Voodoo was the 2 crew derivative of the F101 ‘one-oh-wonder’ interceptor and had supersonic performance, slightly improved missiles but only fire-control radar relying on data-link for direct control of the aircraft during interception. Not a firm aircrew favourite.
The Soviet (Russian) air order of battle included MiG 17 Fresco, MiG 19 Farmer , MiG 21 Fishbed and Sukhoi Su-9 Fishpot . All relied on GCI and were clear air mass interceptors with GCI assistance. Direct competition was the Yakolev Yak-25 Flashlight ’A’ 1955 (2 crew, 2 engines, good radar, twin cannons, A/A rockets), Yakolev Yak-28P Firebar 1964 (2 crew, 2 engines, 2xAA-3 Anab missiles, one semi-active radar, one IR).
The NATO codename ‘Flashlight’ featured wing installed engines and a fairly aerodynamically efficient fuselage with room for a powerful radar and lots of fuel. On introduction to service only unguided A/A rockets and twin cannon were available, missile technology never caught up with the aircraft and it remained undeveloped. Similar speed as the Javelin but much lower ceiling.
The ‘Firebar’ was faster and could climb higher than the Javelin with longer endurance. It carried an improved radar over ‘Flashlight’ and a choice of missile guidance but only 2 and no guns.”
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What equipment would you have liked to have seen added to the Javelin?
“If the fuel control system could have been modified and fuel flow rates improved to allow for efficient reheat at low level the Javelin would have been quite a handful, but there was no identified fighter threat other than the Indonesian “Mad Major” in his Mustang at Medan staging a trophy raid. The usual plea from the back seat for a PPI radar or any range improvement would have had a significant effect.”
Tell me something I don’t know about the Javelin.
“FAW Mk 9(R) carried up to four underwing tanks on cranked pylons to avoid the main undercarriage doors, and a scaffolding pole bolted to the fuselage next to the cockpit canopy as a probe, extending some 5ft beyond the radar nose introducing ‘the sport of kings’ air-to-air refuelling or at least a new jousting format.
A complete box of Tiger Beer would fit into each gun magazine and be perfectly cooled after flight.”
Did the aircraft have a nickname?
“The flying flatiron.”
What was it designed to intercept / fight against?
“Soviet medium/heavy strategic bombers 1955-65.”
What was the operational concept?
“Parallel displaced, crossing or overtaking radar or visual interception to stern attack for either vis-ident followed by guns or a heat-seeking missile launch.”
Could it intercept a Victor, or Vulcan, or Canberra PR9 at max altitude?
How long did the gas last in afterburner?
“Not a simple answer but at low level a matter of a few minutes. The Javelin had a 12% augmented reheat not afterburner so an unusual fuelling and control design. It was On/Off, no modulation and had first usage of the FCU fuel available from the HP pumps reducing the feed to the hot core reducing engine rpm. Although 20,000ft and above was the design usage altitude, cross over was about 8000ft depending on entropy and below that it was a ‘local scaring’ fuel dumping device. Real performance improvement was achieved above 20,000ft but loss of RPM at low level could be 15%.”
How good / bad / reliable, etc was the radar?
“The AI17 was a development of the wartime MkIXC and as mentioned above was moderately low power, low definition and a less than desirable mix of presentations. It’s performance was very yes it’s on or no it’s broken and temperature/humidity had much to do with that. If it switched on, at low level looking up and at medium and high level it was 20nm+ scan on a similar target but lock was unpredictable affecting missile usage, and level or look down at low level was non existent.”
What was it like to fly? Any major operational restrictions?
“It was very pleasant to fly with no heavy stick forces at all but as we eventually discovered it had a very low rolling ‘g’ limit with full aileron defection limited to +2g. This limit either was not included or was so well hidden in the Release to Service that no thought was given to that aspect of the performance envelope. Although night/all weather operations might not have required dynamic manoeuvring, Colonial Policing required more flexibility and it cost an airframe and lives.”
Anything it could do that would surprise an opponent?
“Specifically fitted for use during radar interceptions the ‘barn door’ airbrakes were designed to stop you immediately from your sensible overtake speed into a ‘visual’ position behind a hostile. With due regard to Top Gun who probably learnt it from the Javelin, the use of airbrakes to embarrass an opponent in close combat, force a fly through or past or at least negate a guns solution was a well know party trick. However it did leave you perilously short of energy but 4 Adens went a long way towards rectifying that disadvantage.”
It had an unhappy development history – any problem with stalling behaviour in service?
“No-one in their right mind would deliberately stall a Javelin. There were suitable warning systems in place and the elevator artificial feel system was designed to introduce nose-down pitch at very low speed assuming you had slowed beyond the light aerodynamic warning given by the vanes on the wing top surface. Incidentally these vanes were a serious threat to health on cockpit evacuation if you chose or were forced by water/fuel/ice to slide down the wing towards the tip on your rear. Immersion suits and other things were egg sliced during this manoeuvre.”
Was it reliable? Did it have maintenance bug-bears?
“Although the ground crew liked the aircraft in general there were individual system issues and many were very difficult to access for rectification. If there was an engine starting issue, particularly with the Mk9 and (R) electrically fired cartridge initiated AVPIN, things got out of hand very quickly and rapid evacuations were required upwind. The TMk3 relied on a large gas generating cartridge screwed into the starter motor and fired electrically, simple and effective but very heavy and tricky to change.
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Sapphire engine ‘centreline closure’ (CC) was a ‘thing’ and after several unexplained aircraft losses the problem was identified in 1962 as the compressor casing cooling faster than the drum when in cloud causing the fixed stator shrouds and blades to foul the rotating shrouds catastrophically. The problem had been present since the introduction of the more powerful engine but operations in the Tropics in the ITCZ with Cb penetration increased the severity and incidence. The “Rockide” abrasive compound solution caused the rotating blade tips to be ground down on the coated casing, coarse but effective.
This issue was to cause me, not to mention my ‘first tour’ navigator, several tense minutes during a post CC engine change flight test when half way through the schedule on the ‘new’ engine the existing engine exhibited CC symptoms and failed followed by our expeditious return to Butterworth single engine and retire to the bar.
Added to this, scheduled engine strip-down had discovered harmonic vibration fatigue and operation below 10,000ft other than for take-off or landing was banned in 1965. This was quite quickly rescinded but the the rpm band 86-92% was embargoed so low level operations were conducted one engine up, one engine back.
It was old, fairly fatigued due to enthusiastic low level operation and prone to water ingress issues from standing outside in monsoons. But unless it caught fire or exploded it flew very precisely if sedately and had a small bag of tricks for the unwary opponent.”
Was the Gloster Javelin Actually Terrible?
By Jim Smith
What a fabulous, futuristic-looking aircraft was the Javelin. Flown for the first time on November 26 1951, the Javelin was described (admittedly in 1955) as ‘Structurally and aerodynamically, the Javelin night and all-weather interceptor fighter is perhaps the most impressive aircraft yet produced to fulfil this role’. While today one might regard this as a bit of an over-statement, there’s no denying that the Javelin is an impressive looking aircraft.
It is important to recognise that its contemporaries in this field in US service were the F-89 Scorpion, the F-94C Starfire, the F2H Banshee and the F3D Skyknight, all of which would have been easily out-performed by the Javelin. The three US aircraft were to be replaced in service by the F-101D Voodoo, F-102 Delta Dagger, F-106 Delta Dart and the F-4 Phantom, all much more capable aircraft. Meanwhile, the UK went down a different path leading to the Lightning point-defence interceptor, the F-4K Phantom, and the Tornado F3.
Context and Requirements
When assessing an aircraft, it is important to consider the requirements which drove the design, and consider how they affected the choices made in developing the aircraft. The Javelin was brought into service in an environment where there was intense competition between the US and its Allies, and Russia. The tension had been ramped up by the Russian blockade of Berlin, leading to the Berlin Air Lift, and it was clear that a new Cold War had replaced the conflict of the Second World War. The Korean War had started during the development of the aircraft, and had shown the capabilities of both Soviet and American combat aircraft.
In addition, aircraft and weapons technology was advancing at a furious pace, driven by this contest between Nations and ideologies, and by the opportunities presented by the availability of jet engine technology, allied with (largely) German aerodynamic knowledge. Furthermore, the lead in atomic weapons established by the explosion of the Trinity device on July 16, 1945, was rapidly evaporating, with Soviet development of the A-Bomb and the H-Bomb following much more closely than expected.
The first Soviet Atomic bomb test had taken place in August 1949, followed by a Thermo-nuclear device in August 1957. With the rapid pace of aeronautical development, it was clear to Defence planners that air defence would soon be required capable of deterring and defeating jet bombers able to carry atomic weapons, and that in the event of an attack, interception of the bombers would need to be achieved before they could reach the UK to drop their weapons.
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Moreover, this new capability would be required at night, and in all weathers, meaning that the air defence aircraft would have to carry radar to allow interceptions to be carried out at night, and in poor visibility. This was not going to be possible in the single-seat fighter aircraft being developed in parallel, the Hunter and the Swift, and a specialised all-weather and night fighter was needed. This was to be the Javelin.
The aircraft was developed in response to specification F4/48, which called for a two-seat, twin-engine all-weather interceptor fighter, that would counter enemy aircraft at heights of up to at least 40,000 feet. It would also have to reach a maximum speed of at least 525 knots at this height, and be able to reach an altitude of 45,000 feet within ten minutes of engine ignition.
Additional requirements included a minimum flight endurance of two hours, a take-off distance of no more than 4500 ft, and the equipment of the aircraft with airborne interception radar, and communication and navigational aids.
The threat that the aircraft was expected to counter would have been nuclear armed jet bombers, with broadly the performance of the Valiant, Victor and Vulcan, which were being developed for RAF service. In practice, the Tupolev Tu-16 ‘Badger’ and Tu-20 ‘Bear’ would have been the main targets of interest. To counter these aircraft, the Javelin was initially armed with 4 30 mm Aden cannon, and later 2 cannon and 4 Firestreak air-to-air guided missiles.
Given the payload, performance and endurance requirements, the Javelin was always going to be a large aircraft. The delta wing configuration was selected to provide a big wing area to meet altitude performance requirements, and significant internal volume to meet endurance requirements. The trade-off here was that the relatively thick wing of the Javelin limited it to subsonic speeds – but that was OK because it was designed to combat a subsonic threat.
The choice of a tailed-delta configuration is of particular interest, and was driven by the requirement to operate off a relatively short 4500 ft runway. To take-off and land the relatively heavy aircraft, which had a loaded weight of up to 19.9 tonne, off such a runway would require some form of high lift system, something that is not normally possible on a pure delta, because of the difficulty of trimming the aircraft once flaps are deployed. The T-tail provided the necessary control authority to trim the aircraft with flaps deployed, and the flaps gave an added benefit for night operations, in avoiding the high angle-of-attack and poor forward visibility on the approach of a pure delta configuration. The relatively thick wing section not only allowed good internal volume for fuel, but would, with the flap system, have allowed a slower approach speed for landing.
The demanding requirement for endurance, heavy armament, two crew, and a large radar drove the size and weight of the design. When combined with equally demanding take-off and landing requirements, the tailed delta became a successful solution, with airbrakes and flaps minimising the approach speed, and improving forward visibility.
Development of the aircraft was a little problematic. The first issue to come to light was the loss of a prototype due to elevator flutter, both elevators being lost in flight, and the aircraft recovered with superb airmanship, using tail trim and engine throttle to control the aircraft down to a forced landing. Eventually, the aircraft was fitted with an all-moving tailplane to resolve this issue. A second aircraft was lost due to a deep stall accident, and further aircraft were lost after failing to recover from spins. These accidents resulted in aerodynamic modifications, including the fitting of vortex generators to the wing and fitting a stall warning system. In addition, modifications were made to the rear fuselage and engines to cure buffeting of the rudder, and to increase thrust. Two alternative radar systems were also used, the British AI 17 radar, and the American AI 22.
While the development programme is sometimes referred to as protracted, the aircraft transitioned from first flight on 26 November 1951, to entry into service in February ’56, just over 4 years later. Delivery of the final FAW 8/9 variants started in 1957. The FAW 9 was essentially an FAW 7 brought up to a similar standard to the FAW 8. 6 years from first prototype to fully developed capability, with good endurance, and heavy armament really does not seem too bad an achievement.
So far, JSF development has taken 20 years to progress to the delivery of its baseline capability, albeit with a number of outstanding risks and issues. A modernisation program is now underway, albeit (according to the GAO) without a fully defined and costed business case, and FOC has yet to be achieved.
From a slightly later period than the Javelin, it is worth taking a look at the development of the Convair F-102. This was evolved from the less-than-successful XF-92A, which might be seen as a demonstrator aircraft. The first YF-102A flew on 24 October 1953, and the first fully developed aircraft flew in May 1957, in which time the aircraft had acquired a new fuselage, 11 ft longer than the YF-102A, a new canopy, new air intakes, a new larger fin, modified undercarriage and airbrakes, and a new cambered wing. This rather comprehensive development was followed by a modernisation program that added a datalink, changed the fire control system and added an IR tracker.
So, Was the Javelin Actually Terrible?
This sort of question should only be answered in the historical context. Of course, the Javelin’s performance looks pedestrian when you compare it with the Lightning. The P1B first flew in April 1957, and the first Lightning Squadron stood up in July 1960. The early Lightning offered double the speed, but about a quarter of the endurance, and half the armament of the Javelin. It really was a point-defence interceptor.
The Javelin was designed when the threat was essentially subsonic bombers, carrying gravity-drop nuclear weapons. Once the threat had changed to nuclear-armed stand-off weapons, requiring rapid reaction response from either Quick Reaction Alert or standing Combat Air Patrols supported by air-to-air refuelling tankers, the subsonic Javelin became largely irrelevant, at least in terms of the air defence of the UK.
At the time, however, the UK still maintained its interest in air policing the far-flung colonies, particularly those East of Suez or in the Tropics. In these arenas, particularly operating from Tengah, Singapore during Indonesia – Malaysia tensions in the early 60s; in Hong Kong during the Chinese Cultural revolution; and in Zambia during the Rhodesian Unilateral Declaration of Independence crisis, the Javelin could still play a useful deterrent role.
So, was the Javelin actually terrible? Surprisingly, my answer is no. It did what it said on the packet. Large, heavily armed, with good endurance, and day-night all weather capability, it delivered the specified performance. The real problem was that the unsporting opposition had moved the goalposts. The emerging needs for eye-watering acceleration, climb rate, and dash speed to counter cruise-missile carriers, simply could not be met by the Javelin, with its thick wing.
Relaxation of the short runway requirement, and with the adoption of more powerful engines, a more sophisticated intake system, an area-ruled fuselage, and a thin wing, and the UK might have had a Mirage-like world-beater in the late-fifties. Given the 1957 Duncan Sandys death-blow, leading to an interregnum in manned fighter design, and the fact that the Lightning was already in development, the thin-wing Javelin was a non-starter. The Javelins were withdrawn from operational service in April 1968. A few remained serving the needs of the school of Air Traffic Control at RAF Shawbury for a while, with the very last flying aircraft remaining at Boscombe Down until 1975.
More of Peter Day’s exploits can be found in Gloster Javelin: an operational history by Michael Napier (Pen & Sword Aviation)