The Blackburn B.48 Firecrest, given the SBAC designation YA.1, was a single-engine naval strike fighter built by Blackburn Aircraft for service with the British

Fleet Air Arm The Fleet Air Arm (FAA) is one of the five fighting arms of the Royal Navy and is responsible for the delivery of naval air power both from land and at sea. The Fleet Air Arm operates the F-35 Lightning II for maritime strike, the AW159 Wil ...

during the

Second World War World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposin ...

. It was a development of the troubled Firebrand, designed to

Air Ministry Specification This is a partial list of the British Air Ministry (AM) specifications for aircraft. A specification stemmed from an Operational Requirement, abbreviated "OR", describing what the aircraft would be used for. This in turn led to the specification ...

S.28/43, for an improved aircraft more suited to carrier operations. Three prototypes were ordered with the company designation of B-48 and the informal name of "Firecrest", but only two of them actually flew. The development of the aircraft was prolonged by significant design changes and slow deliveries of components, but the determination by the Ministry of Supply in 1946 that the airframe did not meet the requirements for a strike fighter doomed the aircraft. Construction of two of the prototypes was continued to gain flight-test data and the third was allocated to strength testing. The two flying aircraft were sold back to Blackburn in 1950 for disposal and the other aircraft survived until 1952.

Design

The Firebrand required significant effort by Blackburn to produce a useful aircraft and the first discussions on a redesign of the aircraft with a

laminar-flow In fluid dynamics, laminar flow is characterized by fluid particles following smooth paths in layers, with each layer moving smoothly past the adjacent layers with little or no mixing. At low velocities, the fluid tends to flow without lateral mi ...

wing took place in September 1943. The new wing was estimated to reduce the weight of the wing by and increase the aircraft speed by . The extent of redesign increased and this led to a new fuselage and other improvements. In October 1943, Blackburn's design staff, led by G.E. Petty, started work on this development of the Firebrand which led to Specification S.28/43 being issued by the

Air Ministry The Air Ministry was a department of the Government of the United Kingdom with the responsibility of managing the affairs of the Royal Air Force, that existed from 1918 to 1964. It was under the political authority of the Secretary of State ...

on 26 February 1944 covering the new aircraft.Jackson 1968, p. 452.Mason 1992, pp. 330–331. The specification was designed around a Bristol Centaurus 77

radial engine The radial engine is a reciprocating type internal combustion engine configuration in which the cylinders "radiate" outward from a central crankcase like the spokes of a wheel. It resembles a stylized star when viewed from the front, and is ...

with

contra-rotating propellers Aircraft equipped with contra-rotating propellers, also referred to as CRP, coaxial contra-rotating propellers, or high-speed propellers, apply the maximum power of usually a single piston or turboprop engine to drive a pair of coaxial propell ...

that allowed the size of the rudder to be reduced. The new design, given the company designation ''B.48'', was known unofficially by Blackburn as the "Firecrest" but was always known by S.28/43, the Air Ministry specification. It was a low-winged, single-seat, all-metal

monoplane A monoplane is a fixed-wing aircraft configuration with a single mainplane, in contrast to a biplane or other types of multiplanes, which have multiple planes. A monoplane has inherently the highest efficiency and lowest drag of any wing con ...

. Aft of the cockpit the fuselage was an oval-shaped stressed-skin

semi-monocoque The term semi-monocoque or semimonocoque refers to a stressed shell structure that is similar to a true monocoque, but which derives at least some of its strength from conventional reinforcement. Semi-monocoque construction is used for, among ot ...

, but forward it had a circular-section, tubular-steel frame. The cockpit of the Firecrest was moved forward and raised the pilot's position so that he now looked over the wing leading edge, and down the nose. The

canopy Canopy may refer to: Plants * Canopy (biology), aboveground portion of plant community or crop (including forests) * Canopy (grape), aboveground portion of grapes Religion and ceremonies * Baldachin or canopy of state, typically placed over an ...

was adapted from the

Hawker Tempest The Hawker Tempest is a British fighter aircraft that was primarily used by the Royal Air Force (RAF) in the Second World War. The Tempest, originally known as the ''Typhoon II'', was an improved derivative of the Hawker Typhoon, intended to a ...

fighter. In the rear fuselage was a single fuel tank with two fuel tanks in the centre wing section. The aircraft had a redesigned, thinner, inverted

gull wing The gull wing is an aircraft wing configuration, known also as ''Pulaski wings'', with a prominent bend in the wing inner section towards the wing root. Its name is derived from the seabirds which it resembles. Numerous aircraft have incorpora ...

of laminar flow

aerofoil section An airfoil (American English) or aerofoil (British English) is the cross-sectional shape of an object whose motion through a gas is capable of generating significant lift, such as a wing, a sail, or the blades of propeller, rotor, or turbine. ...

. The wing consisted of a two-

spar SPAR, originally DESPAR, styled as DE SPAR, is a Dutch multinational that provides branding, supplies and support services for independently owned and operated food retail stores. It was founded in the Netherlands in 1932, by Adriaan van Well, ...

centre section with just over 6.5° of anhedral and outer panels with 9° of dihedral.Buttler 1999, pp. 55–57. It could be hydraulically folded in two places to allow more compact storage in the hangar decks of

aircraft carrier An aircraft carrier is a warship that serves as a seagoing airbase, equipped with a full-length flight deck and facilities for carrying, arming, deploying, and recovering aircraft. Typically, it is the capital ship of a fleet, as it allows a ...

s. Four

Fowler flap A flap is a high-lift device used to reduce the stalling speed of an aircraft wing at a given weight. Flaps are usually mounted on the wing trailing edges of a fixed-wing aircraft. Flaps are used to reduce the take-off distance and the landi ...

s were fitted to give good low-speed handling for landing and the wing had retractable

dive brake Dive brakes or dive flaps are deployed to slow down an aircraft when in a dive. They often consist of a metal flap that is lowered against the air flow, thus creating drag and reducing dive speed.Crane, Dale: ''Dictionary of Aeronautical Terms, ...

s on both surfaces. In the course of the redesign the structure was simplified which reduced weight by and even after the fuel capacity was increased by the gross weight was still less than that of the Firebrand.Buttler 2004, p. 181. Work on two prototypes was authorised in November 1943, but proposals for alternative engines delayed progress. In 1945, it was decided that as well as adding another Centaurus-engined prototype, there should be three prototypes with the Napier E.122 (a development of the

Sabre A sabre ( French: �sabʁ or saber in American English) is a type of backsword with a curved blade associated with the light cavalry of the early modern and Napoleonic periods. Originally associated with Central European cavalry such as th ...

) as Specification S.10/45. The Ministry believed that this would enable Blackburn to develop their knowledge of aerodynamic and structural design and support the engine development at Napier. However, it was found that the S.10/45 aircraft could only be balanced if the E.122 powerplant was placed behind the pilot. The necessary redesign and weight increase, coupled with the limited funds available to the Royal Navy, meant that it could no longer be justified and the S.10/45 was cancelled on 8 October. While in final design, the Centaurus 77 engine with contra-rotating propellers was cancelled in January 1946 and a conventional Centaurus 57 was substituted. This engine was found to require flexible mounts and was modified into the Centaurus 59. The vertical stabiliser and rudder had to be enlarged from to to counteract the new engine's torque. In September 1946 a strength analysis conducted by the Ministry of Supply revealed that the aircraft would require strengthening to serve as a strike fighter and that a costly redesign would be required to bring it up to requirements, making it comparable in weight and performance to the

Westland Wyvern The Westland Wyvern was a British single-seat carrier-based multi-role strike aircraft built by Westland Aircraft that served in the 1950s, seeing active service in the 1956 Suez Crisis. Production Wyverns were powered by a turboprop engine dri ...

which had already flown so no contract was placed for production aircraft. Delayed by the late delivery of its propeller, the first prototype was rolled out at Brough in February 1947 and then taken by road to

RAF Leconfield Royal Air Force Leconfield or more simply RAF Leconfield is a former Royal Air Force station located in Leconfield (near Beverley), East Riding of Yorkshire, England. The site is now used by the MoD Defence School of Transport Leconfield or ...

where it made its

maiden flight The maiden flight, also known as first flight, of an aircraft is the first occasion on which it leaves the ground under its own power. The same term is also used for the first launch of rockets. The maiden flight of a new aircraft type is alw ...

on 1 April that year. All three prototypes were completed by the end of September 1947 and the third prototype had been modified to reduce the outer-wing dihedral to 3°. Both the second and third prototypes remained unflown when the Ministry of Supply ordered that flying be ceased and work on the aircraft be stopped. Later in the month, however, the third prototype was allocated to tests of powered aileron controls, as testing of the first prototype had shown that while adequate at cruise speed, the ailerons were heavy both at low and high speed. The second prototype was allocated to structural testing.Buttler 1999, pp. 57–58. The third prototype made its maiden flight in early 1948, but the pace of the flight testing was leisurely with only 7 hours and 40 minutes completed by 30 November, over half of which were connected with air show performances. Testing concluded in March 1949 when the officer in charge concluded that there was no further purpose to the tests.Buttler 1999, pp. 58–59. While the Firecrest was faster than the Firebrand, and gave its pilot a much better view from the cockpit, it was otherwise disappointing, with

test pilot A test pilot is an aircraft pilot with additional training to fly and evaluate experimental, newly produced and modified aircraft with specific maneuvers, known as flight test techniques.Stinton, Darrol. ''Flying Qualities and Flight Testin ...

and naval aviator

Captain Captain is a title, an appellative for the commanding officer of a military unit; the supreme leader of a navy ship, merchant ship, aeroplane, spacecraft, or other vessel; or the commander of a port, fire or police department, election precinct, e ...

Eric Brown claiming that the Firecrest was even less manoeuvrable than the sluggish Firebrand, while the powered ailerons gave lumpy controls, leading to instability in turbulent air.Brown 1978, p. 47.

Operational history

Operational experience had found Blackburn's Firecrest strike fighter to be far from suited to carrier operations. In particular, the pilot sat near the wing's trailing edge, looking over a very long and wide nose which gave a particularly poor view for landing.Brown 1978, p. 46. The Firecrest had also been rendered obsolete by the arrival of

gas turbine A gas turbine, also called a combustion turbine, is a type of continuous flow internal combustion engine. The main parts common to all gas turbine engines form the power-producing part (known as the gas generator or core) and are, in the directio ...

engines, and while Blackburn did draw up proposals for

turboprop A turboprop is a turbine engine that drives an aircraft propeller. A turboprop consists of an intake, reduction gearbox, compressor, combustor, turbine, and a propelling nozzle. Air enters the intake and is compressed by the compressor. ...

-powered derivatives of the Firecrest, (as the B-62 (Y.A.6) with the Armstrong Siddeley Python engine), these went unbuilt, with orders instead going to Westland for the Wyvern. The two flying prototypes remained in use until 1949, being sold back to Blackburn in 1950, and were later scrapped.Buttler 1999, p. 59.

Aircraft

RT651

:One of two prototypes ordered on 1 January 1944 to Specification S.28/43. The airframe was sold by the Controller of Supplies (Air) to Blackburn on 17 April 1950.Sturtivant 2004, pp. 41-43.

RT656

:The second of two prototypes ordered on 1 January 1944, it was used for structural testing before being disposed of in 1952.

VF172

:A third aircraft was ordered on 18 April 1945 and it was used for research into power-boosted ailerons during February 1948. The airframe was sold to Blackburn on 17 October 1949. Three further prototypes were ordered on 1 May 1945 against Specification S.10/45 and powered by Napier E.212 engine, but the order was cancelled and the aircraft were not built.

Operators

(never entered service)

Specifications (Blackburn Firecrest)

References

Bibliography

* Brown, Eric. "The Firebrand...Blackburn's Baby 'Battleship'". '' Air International'', July 1978, Vol. 15:1. pp. 25–31, 46–47. . * Buttler, Tony. ''British Secret Projects: Fighters & Bombers 1935–1950''. Hinckley, UK: Midland Publishing, 2004. . * Buttler, Tony. "Something Useful! Blackburn's 'Firecrest', Son of Firebrand". ''

Air Enthusiast ''Air Enthusiast'' was a British, bi-monthly, aviation magazine, published by the Key Publishing group. Initially begun in 1974 as ''Air Enthusiast Quarterly'', the magazine was conceived as a historical adjunct to '' Air International'' maga ...

''. No. 82, July/August 1999. pp. 55–59. . * Jackson, A. J. ''Blackburn Aircraft Since 1909''. London: Putnam, 1968. . * Mason, Francis K. ''The British Fighter Since 1912''. Annapolis, Maryland: Naval Institute Press, 1992. . * * Sturtivant, Ray. ''Fleet Air Arm Fixed-Wing Aircraft Since 1946''. Tonbridge, Kent, UK:

Air-Britain Air-Britain, traditionally sub-titled "The International Association of Aviation Enthusiasts", is a non-profit aviation society founded in July 1948. As from 2015, it is constituted as a British charitable trust and book publisher. History Air-Brit ...

, 2004. .