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Bristol
Type 123

An unsuccessful fighter prototype that was Bristol's last biplane design.
Bristol Type 123 Filton June 34 The unmarked Bristol Type 123 at Filton in June 1934, prior to its first flight.
 
The Bristol Type 123 was one of two designs put forward by Bristol against requirement F.7/30 for a single seat, four-gun day and night fighter to be powered by the Rolls-Royce Goshawk evaporation-cooled engine.
 
By comparison with other designs of the day, the Type 123 was a small, single bay biplane fighter of less than 30ft wingspan and around 25ft in length. It featured full span ailerons and N-struts between the wings, that were mounted well in from the wing tips and canted markedly outboard.
 
The private venture unmarked prototype was first flown on 12th June 1934. The wings were markedly staggered, with dihedral on the lower wings and sweepback applied to the upper wings.
 
The Type 123 was a generally clean design, with its fixed undercarriage contained in large wheel fairings. The vertical tail surfaces comprised a very small, sharply swept, fixed fin and a large rudder.
 
When flight tested, the Bristol Type 123 was found to be inadequate in terms of lateral stability and was deemed not worth proceeding with, development being dropped in favour of the monoplane Type 133, which is described separately.
 
Bristol Type 123 side view Filton A side view of the Type 123 at Filton showing its clean lines.

Specification

Powerplant 695 hp Rolls-Royce Goshawk III
Span 29 ft 7 in
Maximum Weight 4,737 lb
Capacity  Single seat, four synchronised Vickers machine guns
Maximum Speed 235 mph

Variants

Single example only, flown without markings.

Survivors

Nil; aircraft development halted in favour of the Type 133.

Other information