Blackburn B-54 YA7 Sept 1949 WB781 YA5 fin
The Blackburn B-54 YA-7 WB781 in September 1949, with Griffon engine and original (YA5) fin and rudder.
The Blackburn Aircraft Company B-54 and B-88 were shipborne, anti-submarine aircraft designed against Specification GR.27/45. As such they were required to carry a pilot and observer, depth charges and a search radar.


The first design in this series was the Blackburn B54 or YA5. This type was designed around the proposed Napier Double-Naiad turbo-prop engine, driving co-axial contra-rotating propellers. A deep fuselage contained a weapons bay and a radar system with a retractable radome under the rear fuselage.
The monoplane design featured a tricycle undercarriage and an inverted gull-wing, fitted with an effective high-lift flap system drawing upon experience with the Blackburn B-48 Firecrest. The crew sat in tandem under a long cockpit enclosure. Not wanting to depend on a different, untried powerplant, the design was similar in its general concept to the Fairey Gannet.
When development of the Napier Double Naiad was cancelled, the first prototype (WB781) was completed with a 2,000 hp Rolls-Royce Griffon 56 engine, driving two, three-blade contra-rotating propellers. At the same time, the type designation was updated from YA5 to YA7.
The Blackburn YA7 was flown for the first time from Brough on 20th September 1949, before carrying out deck landing trials on HMS Illustrious, starting from 8th February 1950.
Blackburn B-54 (YA7) WB781 revised fin
The Blackburn B-54 (YA7) WB781 flying with the revised fin and rudder, as fitted to the YA8 WB788.
At this stage, the requirement was changed to seek accommodation for three crew thus introducing a second observer.
The second Rolls-Royce Griffon-powered prototype (WB788) provided the required increased capacity and was designated the Blackburn YA8. It featured a taller fin and a narrower rudder (which was mass-balanced) rather than the aerodynamically-balanced previously utilised.
The Blackburn YA8 was first flown on 3rd May 1950, and introduced changes in the wing planform, presumably associated with changes in the aircraft centre of gravity. The revised fin and rudder geometry of the Blackburn YA8 was also retrospectively fitted to the first (Blackburn YA7) aircraft.
In parallel with these developments, a third prototype (WB797) was built, using the Armstrong Siddeley Double Mamba turboprop engine, driving two four-bladed propellers. In this form, the Blackburn Type number was changed to the Blackburn B-88, with the alternative designation Blackburn YB1.
The Blackburn YB1 was flown for the first time from Brough on 19th July 1950.
Blackburn B-88 (YB1) WB797  20-07-1950
The turboprop Blackburn B-88 (YB1) WB797 photographed on 20th July 1950, the day after its first flight.
After initial flight trials, the span of the Blackburn YB1 was slightly increased, requiring their own outward-folding hinge to ensure that they did not foul each other as the main outer panels were folded inwards.
Following competitive trials, the Fairey Gannet was eventually selected in March 1951, and it was this type that entered large-scale production. The Blackburn B-88 YB1 was passed to Armstrong Siddeley Motors who used it to support the development of the Double Mamba engine, until it was scrapped in July 1955.
Early however, the Blackburn YA7 and YA8 had been transferred to Royal Aircraft Establishment (RAE) at Farnborough during 1954, although both aircraft were withdrawn from use and scrapped by the end of 1957.
Blackburn B-88 YB1 WB797 display
The Blackburn B-88 (YB1) WB797 displays its manoeuvrability and its large weapons bay at the 1950 SBAC Show.



  B-54 (YA7) B-54 (YA8) B-88 (YB1)
Powerplant One 2,000 hp R-R Griffon 56 piston engine One 2,950 ehp AS Double Mamba 100 turboprop
Span   44 ft 2 in
Maximum Weight 13,729 lb 13,729 lb 13,091 lb (without weapon load)
Capacity and armament Two crew, mines, depth charges, etc. Three crew, mines, depth charges etc. Three crew, mines, depth charges, etc.
Maximum Speed 251 mph 251 mph 320 mph at 10,000 ft
Endurance / Range   Endurance stated to exceed 3 hours.


Numbers & Variants

Variant Designation Number built and distinguishing features                                   
Blackburn B-54 (YA7) One only (WB781) Two crew, Griffon 56 piston engine
Blackburn B-54 (YA8) One only (WB788) Three crew, Griffon 56 piston engine 
Blackburn B-88 (YB1) One only (WB797) Three crew, AS Double Mamba turboprop engine



None - all three aircraft being scrapped prior to the end of 1957.


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