Royal Aircraft Factory B.E.12
|An early production B.E.12|
|Role||General purpose aircraft/Fighter|
|Manufacturer||Royal Aircraft Factory, Various|
|First flight||28 July 1915|
|Introduction||1 August 1916|
|Primary user||Royal Flying Corps|
Intended for use as a long-range reconnaissance and bombing aircraft, the B.E.12 was pressed into service as a fighter, in which role it proved disastrously inadequate, mainly due to its very poor manoeuvrability.
The B.E.12 was essentially a B.E.2c with the front (observer’s) cockpit replaced by a large fuel tank, and the 90 hp RAF 1 engine of the standard B.E.2c replaced by the new 150 hp RAF 4. Aviation historians once considered the type a failed attempt to create a fighter aircraft based on the B.E.2 - that was improvised and rushed into service to meet the Fokker threat. Many writers perpetuate this view or something like it. J.M. Bruce, on the other hand, has pointed out that this is simplistic at best and doesn't fit historically.
The prototype (a modified B.E.2c airframe fitted with the more powerful 150 hp (112 kW) RAF 4a air-cooled V12 engine) was already in the process of conversion in June 1915, while the Fokker scourge cannot be said to have started before the first victory by a Fokker E.I on 1 August, when Max Immelmann shot down a British aircraft that was bombing Douai aerodrome. At the time the B.E.12 was conceived the necessity for an aeroplane to defend itself was by no means as clear as it became later. The idea of dispensing with defensive armament altogether and replacing the observer's seat with extra fuel capacity and/or bombload was typified by several contemporary designs, such as the bomber versions of the Avro 504, and Sopwith 1½ Strutter. In any case the B.E.12 cannot have been produced specifically as an "answer" to the Fokker.
In mid-1915 there was no way for a British single seat tractor aircraft to carry a forward firing armament as the Vickers-Challenger "interrupter" gear did not exist until December and was not available in numbers until the following March. The latest Royal Aircraft Factory single seat fighter of the time, the F.E.8, was a nimble little pusher - proving if nothing else that its designers were very well aware of the basic requirements of a successful fighter.
Nor was the B.E.12 "rushed" into service as would have been relatively easy as it was a straight forward conversion of a type in production. Trials with the prototype continued through late 1915 and seem to have been mainly concerned with the development of the new RAF 4 engine, especially the design of a satisfactory air scoop. Cooling of the rear cylinders of the RAF 4, an air-cooled V12 and later the engine of the R.E.8, was always rather dubious. The type was also tested as a bomber. It was May 1916 (when the "Fokker scourge", as a period of German air superiority was over) that it was decided to fit a synchronised Vickers gun to the type, armament trials had already been undertaken with upward firing Lewis guns, similar to those used by the night fighter version of the B.E.2c.
The B.E.12a variant flew for the first time in February 1916 and had the modified wings of the B.E.2e. It was rather more manoeuvrable than the B.E.12 but was otherwise little improved.
The B.E.12b used the B.E.2c airframe but had the 200 hp Hispano-Suiza engine. It was intended as a night fighter and carried wing mounted Lewis guns in place of the synchronised Vickers. Apparently it had a good performance but the engine was more urgently needed for the S.E.5a and very few B.E.12b fighters went into service with home defence squadrons. Some of those built may never have received engines.
The first B.E.12 squadron, No. 19 did not reach France until 1 August 1916. It was followed by the only other squadron to fly the type in France, No. 21, on the 25th. As might have been expected, the new type had all the inherent stability of the B.E.2c and when pressed into service as a fighter proved quite useless, especially in the face of the new German Halberstadt and Albatros fighters coming into service. It continued to be employed as a bomber but since an effective defensive gun could not be mounted it was too vulnerable and was finally withdrawn from all front line duties in France in March 1917. By the time the B.E.12a became available in numbers the B.E.12 had already proved to be unsatisfactory and this variant was never used operationally in France.
Several Home defence squadrons flew B.E.12s, along with examples of the B.E.12a and B.E.12b variants. Its stability and range were obvious advantages in an aircraft that had to fly at night but its rate of climb was inadequate when called on to intercept the improved German airships of 1916/17, not to mention the aeroplane raiders that replaced them. The Zeppelin L.48 was shot down by a Home Defence B.E.12 on 17 June 1917 but otherwise there are few recorded successes of the type in this role.
In the Middle East theatre and in Macedonia, the B.E.12 and B.E.12a proved more useful – although typically as long range reconnaissance aircraft rather than as fighters. An exception to this rule was the machine of Captain Gilbert Ware Murlis Green of No. 17 Squadron who shot down several enemy aircraft to become the only B.E.12 ace.
The B.E.12b served only with Home Defence squadrons; deliveries began in late 1917, but due to the more urgent need of the S.E.5a squadrons for their Hispano-Suiza engines many were probably either never fitted with engines, or completed as B.E.12s.
- B.E.12 - Initial production version powered by a RAF 4a engine - basically a B.E.2c conversion (250 built by Daimler, 50 built by Standard Motors)
- B.E.12a – With the wings and tail unit of the B.E.2e (50 built by Daimler, 50 built by Coventry Ordnance Works)
- B.E.12b - Re-engined version powered by a 200 hp (149 Kw) Hispano-Suiza engine (200 built by Daimler)
- Royal Flying Corps
- No. 10 Squadron RFC
- No. 14 Squadron RFC
- No. 17 Squadron RFC
- No. 19 Squadron RFC
- No. 21 Squadron RFC
- No. 36 Squadron RFC
- No. 37 Squadron RFC
- No. 39 Squadron RFC
- No. 47 Squadron RFC
- No. 48 Squadron RFC
- No. 50 Squadron RFC
- No. 51 Squadron RFC
- No. 66 Squadron RFC
- No. 75 Squadron RFC
- No. 76 Squadron RFC
- No. 77 Squadron RFC
- No. 78 Squadron RFC
- No. 89 Squadron RFC
- No. 101 Squadron RFC
- No. 112 Squadron RFC
- No. 141 Squadron RFC
- No. 142 Squadron RFC
- No. 144 Squadron RFC
- No. 150 Squadron RFC
Data from War Planes of the First World War:Volume Two Fighters 
- Crew: One
- Length: 27 ft 3 in (8.31 m)
- Wingspan: 37 ft 0 in (11.28 m)
- Height: 11 ft 1½ in (3.39 m)
- Wing area: 371 ft² (34.47 m²)
- Empty weight: 1,635 lb (743 kg)
- Max. takeoff weight: 2,352 lb (1,069 kg)
- Powerplant: 1 × RAF-4a air-cooled V12 engine, 150 hp (112 kW)
- Maximum speed: 102 mph (89 knots, 164 km/h) at sea level
- Service ceiling: 12,500 ft (3,810 m)
- Endurance: 3 hours
- Climb to 5,000 ft (1,500 m): 11 minutes
- Guns: 1× .303 in (7.7 mm) synchronised Vickers machine gun – some aircraft carried various arrangements of rearward firing Lewis guns.
- Bombs: up to 336 lb (150 kg) bombs
- Related development
- Related lists
- Bruce 1968, V. 2 p.20.
- Bruce 1982, p. 395.
- Bruce 1968, V. 2 p.26.
- Bruce 1982, p. 397.
- Bruce, J.M. (1968). War Planes of the First World War:Volume Two Fighters. London: Macdonald. ISBN 0-356-01473-8.
- Bruce, J.M. (1982). The Aeroplanes of the Royal Flying Corps (Military Wing). London: Putnam. ISBN 0-370-30084-X.
- The Illustrated Encyclopedia of Aircraft (Part Work 1982-1985). Orbis Publishing.
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