The Blackburn B-48, unofficially known as the Firecrest, was given the S.B.A.C designation YA.1 and was a naval strike fighter destined for service with the British Fleet Air Arm after World War II.
Designed against Specification S.28/43 which sought 'an improved development of the Blackburn Firebrand' but with much more emphasis being placed on improving forward view for the pilot and an increased maximum speed.
The resultant design featured the required evolution of the Firebrand fuselage with a raised and repositionsed cockpit which was also moved significantly forward.
A completely new wing design was employed featuring an anhedral centre-section and a new thinner 'laminar flow' wing section on the outer. In some respects, Blackburn were employing lessons learned from other types such as the Chance Vought Corsair, the NA Mustang and the Hawker Tempest.
For carrier compatibility, hydraulically-powered wing folding were provided with an unusual double inward folding geometry. As with the Firebrand, the highly effective Fowler flap system was fitted to give good low-speed handling. The aircraft was also fitted with retractable wing-mounted dive brakes.
The intended armament included a single torpedo or two underwing 250 lb bombs. Provision was also made for the carriage of rockets and two underwing Browning 0.5 inch machine gun pods or long range drop tanks.
Two aircraft were initially built at Brough (RT651 and VF172) although neither was fitted with gun armaments.
The first (RT651) flew for the first time from RAF Leconfield on 1st April 1947 and this clean aircraft was found to be some 40 mph faster than the Firebrand, achieving a maximum speed of 380 mph (at 19,000 ft) when powered by a 2,475 hp Bristol Centaurus 59 engine.
The second prototype (RT656) never actually flew, being utilised for structural testing before being scrapped in 1952
The third prototype was ordered in April 1945 (VF172) and had a reduced dihedral on the outer wing surfaces as well as power-assisted ailerons. This aircraft was displayed in public for the first time on 21st August 1948, prior to flying at the Farnborough SBAC Show in September of that year.
After a drastically reduced flight test program during which test pilots described it as 'disappointing' and it was agreed that there was no purpose in further tests.
Development of the B-48 Firecrest did not proceed as it was clear that jet or turboprop power would be adopted for future military aircraft use.
This is further illustrated by the Fleet Air Arm adopting the Westland Wyvern and the Fairey Gannet for shipboard strike and anti-submarine use, with the Supermarine Attacker and Hawker Sea Hawk serving in the fighter role.
Blackburn switched their attention to the B-54 (YA7, YA8) and B-88 (YB1) which were both unsuccessfully offered in competition to the Fairey Gannet - these types are described separately on their own web pages.
|Powerplant||One 2,475 hp Bristol Centaurus 59 engine|
|Span||44 ft 11.5 in|
|Maximum Weight||15,280 lb|
|Capacity and armament||Single pilot and provision for torpedo, underwing rockets, drop tanks or two 0.5 inch Browning gun pods.|
|Maximum Speed||Clean:380 mph at 19,000 ft|
|Range||Clean: 900 miles at 213 mph at 15,000 ft; With torpedo: 750 miles at 272 mph at 10,000 ft|
|Two prototypes only||RT651 and VF172|
No examples of the Blackburn B-48 Firecrest survive.