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Vickers FB.12

Страна: Великобритания

Год: 1916

Fighter

Vickers - FB.11 - 1916 - Великобритания<– –>Vickers - FB.14 - 1916 - Великобритания


C.Andrews Vickers Aircraft since 1908 (Putnam)


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  Also in the single-seat fighter class were the two Vickers pusher types, the F.B.12 and the F.B.26. Both had chequered careers. The F.B.12 was also intended for the 150 hp Hart static radial engine, but continual delays with this engine and the shortage of rotaries for experimental work led to the installation of an 80 hp Le Rhone taken from another aeroplane. The F.B.12 flew in June 1916, but, being underpowered, had a most disappointing performance. A 100 hp Gnome monosoupape was then substituted. Even in this guise, as the F.B.12A, it still had only two-thirds the designed power, and so lost any performance advantage it might have had (with the 150 hp promised from the Hart) over the D.H.2 and F.E.8 pusher fighters already in service, but it went to France in December 1916 for operational trials. The F.B.12B with the Hart engine was completed in February 1917, its wing span increased from 26 ft to 29 ft 9 in, but it crashed, thus helping to settle the fate of the Hart engine once and for all. A contract was placed with the Wells Aviation Company of Chelsea for the F.B.12C, and the few examples made were fitted with a variety of engines, including Gnome monosoupape, Le Rhone and the Anzani static radial, all nominally about 100 hp. The AID report on the first production example, A7351, was so critical, and disclosed a top speed of only 87 mph, that, coupled with the failure of the Hart, it could lead to nothing but a cancellation of the contract.


  F.B.12C - One 150 hp Hart. Span 29 ft 9 in, upper, and 26 ft 9 in, lower; length 21 ft 10 in; height 8 ft 7 in; wing area 237 sq ft. Empty weight 927 lb; gross weight 1,447 lb. Max speed 87 mph at 6,500 ft; climb to 10,000 ft - 18 1/2 min; service ceiling 14,500 ft; absolute ceiling 15,000 ft; endurance 3 1/4 hr. Armament one Lewis gun mounted in nose of nacelle.


H.King Armament of British Aircraft (Putnam)


F.B.12. The single Lewis gun of this pusher single-seater, which dated from mid-1916, was mounted on the centre line of the nacelle (viewed in plan) and far forward, with a short length of the barrel casing exposed. The position of the gun rendered the changing of ammunition drums difficult. Although in some installations the gun appears to have been fixed, there are strong indications in other instances of interlinking of the gun with the assembly ahead of the windscreen which carried the sights, suggesting that the gun could be elevated in conjunction with the sights. There is, too, some mystery attending the gun itself, as seen in at least two photographs, for this appears to be of neither standard Vickers nor Lewis type, Whether the 'gun' was a dummy, and whether a version of the Vickers rocket gun was fitted or intended, are matters for exciting speculation.


Jane's All The World Aircraft 1919


F.B.12C. PUSHER BIPLANE. SINGLE SEATER.
  
  
  Fitted with various rotary and fixed radial engines.
  Armament: One or two elevatable Lewis guns firing forward.


W.Green, G.Swanborough The Complete Book of Fighters


VICKERS F.B.12 UK

  A compact two-bay biplane of pusher type, the F.B.12 was designed for the 150 hp Hart static radial engine, in the development of which the Hart Engine Company was being assisted by Vickers. With a single-seat nacelle faired out to a circular cross section and mounted in mid wing-gap, and tailbooms converging in side elevation to meet at the rear spar of the tailplane. the F.B.12 had a basic structure primarily of steel tube. Unavailability of an airworthy Hart engine led to the first F.B.12 being fitted with an 80 hp Le Rhone rotary, with which it flew in June 1916. Although underpowered, it demonstrated a creditable performance when tested at the Central Flying School in the following August. The Le Rhone was then replaced by a 100 hp Gnome Monosoupape, and, subsequently, new wings of greater span were fitted - overall span being extended by 3 ft 7 in (1,09 m) - with straight raked rather than elliptical tips. Redesignated F.B.12A, this aircraft was sent to France for operational evaluation in December 1916. A further aircraft was built - by Wells Aviation of Chelsea - with the Hart engine as the F.B.12B. This was flown early in 1917, but promptly crashed, helping to seal the fate of the Hart radial. A contract for 50 aircraft powered by the Hart had, on 10 November 1916, been awarded Vickers, the intention being to fit the series aircraft with a new, wooden nacelle and enlarged vertical tail surfaces as the F.B.12C. Production of the F.B.12C was sub-contracted to Wells Aviation, but with the loss of the F.B.12B, the Hart engine was abandoned. In the event, only 18 F.B.12C airframes were completed and these were fitted with a variety of engines, including the 110 hp Le Rhone nine-cylinder rotary and the 100 hp Anzani 10-cylinder radial. Testing at Martlesham Heath in May 1917 revealed insufficient elevator control at low speeds, heavy lateral control and other problems. Furthermore, the gun (a 0.303-in/7,7-mm Lewis) was considered to be badly positioned for changing ammunition drums. By this time, tractor fighters of superior performance were in RFC service and further development of the F.B.12 was therefore discontinued. The following data relate to the Le Rhone-powered F.B.12C.

Max speed, 87 mph (140 km/h) at 6,500 ft (1980 m), 81 mph (130 km/h) at 10,000 ft (3 050 m).
Time to 6,500 ft (1980 m), 9.7 min.
Service ceiling, 14,500 ft (4 420 m).
Endurance, 3.25 hrs.
Empty weight, 927 lb (420 kg).
Loaded weight, 1,447 lb (656 kg).
Span. 29 ft 7 in (9,02 m).
Length, 21ft 10 in (6,65 m).
Height, 8 ft 7 in (2,62 m).
Wing area, 237 sq ft (22,02 m2).


Журнал Flight


Flight, June 12, 1919.

"MILESTONES"

THE VICKERS MACHINES

The F.B. 12. (June, 1916)

  Early in 1916, a single-seater pusher scout, known as the F.B. 12, was constructed. This machine was designed for the 150 Hart engine, but, owing to these engines being unobtainable, the 80 h.p. Le Rhone was substituted.
  Having regard to the reduced power of the engine in use, the results obtained on its first flight in June, 1916, were considered very satisfactory, the speed attained being 95 miles per hour, and the manoeuvreability excellent. A similar machine was equipped with a 100 h.p. monosoupape engine, and sent to France in December, 1916, where it proved itself at least equal to other machines of a similar type then in use in that country.

W.Green, G.Swanborough - The Complete Book of Fighters
Elliptical wing-tips distinguished the first F.B.12, here with Gnome Monosoupape engine.
C.Andrews - Vickers Aircraft since 1908 /Putnam/
F.B.12C re-engined with 100 hp Gnome monosoupape; its distinguishing feature is the excellent pilot's view provided by the raised nacelle.
Журнал - Flight за 1919 г.
THE VICKERS F.B. 12 PUSHER SCOUT. - This particular machine is fitted with a 100 h.p. Gnome, but others of the same type were fitted with 80 h.p. and 110 h.p. le Rhones and 100 h.p. Anzanis
Jane's All The World Aircraft 1919 /Jane's/
Three-quarter Rear View of Vickers' Single-Seater Pusher Fighter. (Type F.B.12.C.)
The F.B.12 achieved little success and was never fitted with the intended Hart engine.
H.Cowin - Aviation Pioneers /Osprey/
The term 'inertia' is normally applied to a physical object's resistance to any change of state in its motion, sometimes, however, the term is equally applicable to the mind-set of a company's management, as in the case of Vickers' FB 12. First flown in June 1916, the initial FB 12 used an 80hp Le Rhone, but production examples of this single-seat fighter were to have been powered by the 150hp Hart rotary. Following the failure of this engine, the FB 12, with its long-obsolete pusher-engined layout was fitted with a 110hp Le Rhone to become the FB 12C. By the time the FB 12C had flown it was the spring of 1917, subsequent flight trials showing the machine to have a top level speed of 87mph at a time when average fighter speeds exceeded 110mph. To add further to Vickers' troubles, the second FB 12C, serial no A 7352, seen here fitted with a 100hp Anzani was criticised by Martlesham Heath, in June 1917, as lacking sufficient pitch control at low speed and having generally heavy handling traits. Of the 50 production batch ordered, all but 18 were to be cancelled.
C.Andrews - Vickers Aircraft since 1908 /Putnam/
A line-up of Vickers experimental aircraft at Joyce Green; (left to right) F.B.12C, F.B.14, F.B.11, F.B.16.
Журнал - Flight за 1919 г.
Front Elevations of the Vickers machines
Журнал - Flight за 1919 г.
Side elevations ot fhe Vickers machines
Журнал - Flight за 1919 г.
Plan views of the Vickers machines
C.Andrews - Vickers Aircraft since 1908 /Putnam/
F.B.12