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 Aeroplane Company 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 Bristol 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. It was a generally clean design, with its fixed undercarriage contained in large wheel fairings. The vertical tail surfaces comprised of 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. Thereafter, it was deemed as not worth of proceeding with development being dropped in favour of the Bristol Type 133 monoplane, described elsewhere on this website.
 
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


None

 

Other information