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[Development] Javelin F.A.W Mk 9 - Delta Defender



In update 1.85 “Supersonic”, we introduced the Gloster Javelin as the first British Rank VI aircraft to enter the skies of War Thunder. Since its introduction, this aircraft has become quite the hot topic of discussion among the community and we wanted to share with you a little more about the history of the aircraft, our research and some insight into our further investigations on the RAF's first Delta-winged all weather fighter.


Firstly, we would like to point out that our information on the performance of the Javelin F.A.W Mk 9, comes from the RAF Javelin F.A.W Mk 9 Pilots Notes, prepared under the direction the Minister of Aviation and issued to Pilots of the Javelin in 1960. As these notes come from official RAF sources and British government departments, we take them as the most accurate and reliable source on the Javelin. We also recently took several research trips to assist with our investigations to IWM Duxford, who house one of the only remaining Javelin F.A.W Mk 9s and the Newark Air Museum who have a F.A.W Mk 8 in their care.


Javelin 8 Newark.jpg

Javelin F.A.W Mk 8 at the Newark Air Museum


The Gloster Javelin itself was born from specfiaction F.4/48 as an all weather and night interceptor in direct competition to the De Havilland DH.110, that would develop into the Fleet Air Arm’s De Havilland Sea Vixen. Ultimately the RAF chose the Javelin to fulfil the need of an aircraft that could intercept bombers around the clock. It's important to understand that the Javelin was not intended as a standard fighter like the Hunter, F-100 or MiG-19. The RAF had Hunters at their disposal to fulfil its needs for an offensive fighter, whilst the Javelin would purely be the shield, very much on the defensive. Thus, the Javelin simply cannot be compared to many other aircraft in game as its operational requirements and use was vastly different.


The Javelin F.A.W Mk 9 was not actually the last production Mark of Javelin to leave the Gloster Aircraft Co’s production lines, that was actually the F.A.W Mk 8. The Mk 9 was rather a conversion modification handled by Gloster of the older F.A.W Mk 7 airframe to incorporate many of the upgrades found on the Mk 8. Since the Mk 8 came out quite swiftly after the Mk 7, many Mk 7 airframes simply went into storage before even seeing service, so the Mk 9 would make use of those by bringing the Mk 8s improvements to the older airframes. An even later Mk 9 model exists in the F.A.W Mk 9R which included large in-flight refueling probes distinguishing it from the standard Mk 9 like we have in game.


Javelin Dux 2.jpg

Javelin F.A.W Mk 9 (A&AEE) at IWM Duxford



With regards to the engines of the Javelin, it's important to note many different sources use different names when addressing the type of engines the Javelin had, which has caused quite a bit of confusion. Our Javelin had the Armstrong Siddeley Sapphire 7 series engine, which is also referred to as the “200” series. Thus, all Marks within the 200 series fall under the Sa.7 engine category. Initially, the Mk 9 Javelins were fitted with the Mk 205/206 engines, however this was later supplemented with Mk 209/210. There was no difference in thrust performance between these two series of engines as the pilots notes clearly states, any combination of Mk 205/206 + Mk 209/210 engine could be used as they are all part of the Sa.7 series. The pilot's manual states that the engines develop 10,500lb of static thrust (without reheat) at sea level, which is reflected in game with a fully upgraded Javelin.



Powerplant information from the Javelin F.A.W Mk 9’s Pilots notes.



Initially, our Javelin showed the Mk 205/206 combination in X-ray mode, however we have since changed this to reflect a Mk 209/210 combination.


Javelin Engines X-ray.jpg


Structural Limitations - V and G Limits:

All of the aircraft in game use Pilots notes to get the correct Velocity - Never Exceed (Vne) limits with a safe coefficient of 1.05. The Javelin’s Vne is 535 Knots which are the red values in the HUD.The actual Vne limit which the airframe breaks at is 1.05 x Vne. Similarly the G limitations are also clearly defined in the Javelins Manual. It's also worth noting the sheer size of the Javelin. The RAF defeated many operational restrictions and limitations on the Javelin that other aircraft like the Hunter and Sea Vixen did not have. Whilst the Javelin can definitely compete with aircraft like the Hunter or F-86, its by no means their superior.


Max Speed.jpgG Limitations.jpg

Maximum Speed and G Limitations from the pilots notes



As always, we aim to share all of our findings with you as we have here. We will continue to conduct further investigations into bugs reports and always encourage further reports should more information arise. It's also important  to understand, that whilst the Javelin is the first British Rank VI aircraft, it is by no means their last.


Currently we are aware of some reports that are under investigation



Whilst at IWM Duxford, we also managed to speak with a member of the “Old Dux” association, a group of EX RAF pilots and personnel who worked at RAF Duxford during its operational years, including those of No. 64 Squadron, who operated Gloster Javelins from Duxford. We would like to thank John Porter for his assistance and references.


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