Aircraft / Aviation Vehicles & Artillery Infantry Arms Warships & Submarines Military Ranks Military Pay Chart (2024)
Aviation / Aerospace

Blackburn B.90

Variable-Sweep Wing Jet Fighter Proposal [ 1952 ]

The Blackburn B.90 fighter was proposed during the 1950s for the Royal Air Force - intended to feature variable-sweep wings.

Authored By: Staff Writer | Last Edited: 04/17/2020 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site.

By the 1950s, the turbojet engine was firmly entrenched as the aviation powerplant of the future. In response, a myriad of companies, both in the East and West, undertook various aircraft projects to satisfy a plethora of requirements by their respective air services. In Britain, where the turbojet was brought to life by engineer Frank Whittle, the various World War 2 defense powerhouses jumped at the chance to fulfill Royal Air Force (RAF) requirements of the period - with the Soviet Union being the enemy of the day. One such requirement - a design that would eventually lead the country's aero-industry down the path to the "swing-wing" PANAVIA "Tornado" attacker of the 1970s - became the "B.90" project aircraft proposed by Blackburn Aircraft.

The P.90 was drawn up as single-seat, twin-engine fighter featuring an all-swept-wing arrangement (swept edges showcased at both mainplanes and tail surfaces). Like other fighters of the 1950s, it utilized a classic turbojet configuration in that the nose section was cut-off to act as the intake in aspirating the turbojet installations within. The aircraft was to be powered by two turbojet engines - these seated in an "over-under" configuration within the fuselage - to achieve the desired high-speed performance. The concept of stacking the engines meant that the fighter had to be given a deeper-than-usual fuselage though it remained quite slim from the top-down profile.

The other unique quality of this aircraft was in the proposed use of a variable-sweep wing mainplanes in which these members could be extended outwards or swept back against the fuselage sides to adapt the aircraft to various flight envelopes (low-and-slow, high-and-fast). The mainplanes were seated at midships while being mid-mounted.

The cockpit was positioned at front in the usual way with the intake ductwork to pass under the cockpit floor. The pilot would sit under a framed canopy offering adequate vision around the aircraft. Over the rear of the airframe was positioned the sole vertical tail unit running from near-midships at the fuselage dorsal spine and extended out over the engine exhaust ports at the rear. A retractable wheeled undercarriage is assumed for ground-running but not formally detailed in the available Blackburn plans.

As drawn up, the B.90 was given an overall length of 61 feet with an extended wingspan of 65 feet. With wings tucked in, the value became 35.2 feet. Weight was to reach 34,600lb when loaded with fuel and ammunition.

Armament was to become a pair of 30mm ADEN automatic cannons, these recessed in the walls of the forward fuselage ahead and installed below the cockpit floor line. The firepower inherent in this arrangement was enough to bring down any aircraft being flown by the enemy.

To power the fighter, Blackburn engineers focused on a pair of Armstrong Siddeley "Sapphire" Sa.4 turbojet types outputting 9,760lb of dry thrust each. This could be enhanced to 12,000lb of thrust each with reheat (afterburner) engaged. The Sapphire was a logical choice, the powerplant used to drive the Gloster "Javelin" and Hawker "Hunter" fighters as well as the Handley Page "Victor" nuclear-capable bomber. The axial-flow engine was produced, under-license, in the United States by Curtiss-Wright as the famous "J65".

Estimated performance specs included a maximum speed of 895 miles-per-hour, capable of reaching Mach 1.35 in straight-level flight, at around 45,000 feet of altitude. Due to the speeds and altitudes at play the fighter would have been completed with pressurization and an ejection seat.

All told, the proposed B.90 was a sleek offering for its time, despite its deep appearance, as it showcased a balanced collection of smooth and sharp lines.

In any event, the B.90 was not furthered beyond its proposed paper form and eventually fell to aviation history. Many other swing-wing design proposals eventually followed it, these provided by the various defense players of the period, and ultimately British industry, in conjunction with several European partners, could hang their hat on the work that would produce the excellent Tornado strike platform to come in 1979.©MilitaryFactory.com
Note: The above text is EXCLUSIVE to the site www.MilitaryFactory.com. It is the product of many hours of research and work made possible with the help of contributors, veterans, insiders, and topic specialists. If you happen upon this text anywhere else on the internet or in print, please let us know at MilitaryFactory AT gmail DOT com so that we may take appropriate action against the offender / offending site and continue to protect this original work.


Service Year

United Kingdom national flag graphic
United Kingdom

Development Ended.


National flag of the United Kingdom United Kingdom
(OPERATORS list includes past, present, and future operators when applicable)
Air-to-Air Combat, Fighter
General ability to actively engage other aircraft of similar form and function, typically through guns, missiles, and/or aerial rockets.
X-Plane (Developmental, Prototype, Technology Demonstrator)
Aircraft developed for the role of prototyping, technology demonstration, or research / data collection.

61.1 ft
(18.62 m)
65.1 ft
(19.84 m)
34,613 lb
(15,700 kg)
(Showcased structural values pertain to the base Blackburn B.90 production variant)
Installed: 2 x Armstrong Siddeley "Sapphire" Sa.4 afterburning turbojet engines developing 9,760lb of dry thrust each and 12,000lb of thrust each with reheat.
Max Speed
556 mph
(895 kph | 483 kts)
44,997 ft
(13,715 m | 9 mi)

♦ MACH Regime (Sonic)
RANGES (MPH) Subsonic: <614mph | Transonic: 614-921 | Supersonic: 921-3836 | Hypersonic: 3836-7673 | Hi-Hypersonic: 7673-19180 | Reentry: >19030

(Showcased performance specifications pertain to the base Blackburn B.90 production variant. Performance specifications showcased above are subject to environmental factors as well as aircraft configuration. Estimates are made when Real Data not available. Compare this aircraft entry against any other in our database or View aircraft by powerplant type)
2 x 30mm Aden internal automatic cannons in forward fuselage sides (one gun per side). Unknown ammunition stock.

Supported Types

Graphical image of an aircraft automatic cannon

(Not all ordnance types may be represented in the showcase above)
Hardpoint Mountings: 0

B.90 - Base Project Designation.

Military lapel ribbon for Operation Allied Force
Military lapel ribbon for the Arab-Israeli War
Military lapel ribbon for the Battle of Britain
Military lapel ribbon for the Battle of Midway
Military lapel ribbon for the Berlin Airlift
Military lapel ribbon for the Chaco War
Military lapel ribbon for the Cold War
Military lapel ribbon for the Cuban Missile Crisis
Military lapel ribbon for pioneering aircraft
Military lapel ribbon for the Falklands War
Military lapel ribbon for the French-Indochina War
Military lapel ribbon for the Golden Age of Flight
Military lapel ribbon for the 1991 Gulf War
Military lapel ribbon for the Indo-Pak Wars
Military lapel ribbon for the Iran-Iraq War
Military lapel ribbon for the Korean War
Military lapel ribbon for the 1982 Lebanon War
Military lapel ribbon for the Malayan Emergency
Military lapel ribbon representing modern aircraft
Military lapel ribbon for the attack on Pearl Harbor
Military lapel ribbon for the Six Day War
Military lapel ribbon for the Soviet-Afghan War
Military lapel ribbon for the Spanish Civil War
Military lapel ribbon for the Suez Crisis
Military lapel ribbon for the Ukranian-Russian War
Military lapel ribbon for the Vietnam War
Military lapel ribbon for Warsaw Pact of the Cold War-era
Military lapel ribbon for the WASP (WW2)
Military lapel ribbon for the World War 1
Military lapel ribbon for the World War 2
Military lapel ribbon for the Yom Kippur War
Military lapel ribbon for experimental x-plane aircraft

Ribbon graphics not necessarily indicative of actual historical campaign ribbons. Ribbons are clickable to their respective aerial campaigns / operations / aviation periods.

Images Gallery

1 / 1
Image of the Blackburn B.90
Image copyright www.MilitaryFactory.com; No Reproduction Permitted.

Disclaimer | Privacy Policy | Cookies

2024 Military Pay Chart Military Ranks DoD Dictionary Conversion Calculators Military Alphabet Code Military Map Symbols

The "Military Factory" name and MilitaryFactory.com logo are registered ® U.S. trademarks protected by all applicable domestic and international intellectual property laws. All written content, illustrations, and photography are unique to this website (unless where indicated) and not for reuse/reproduction in any form. Material presented throughout this website is for historical and entertainment value only and should not to be construed as usable for hardware restoration, maintenance, or general operation. We do not sell any of the items showcased on this site. Please direct all other inquiries to militaryfactory AT gmail.com. No A.I. was used in the generation of this content; site is 100% curated by humans.

Part of a network of sites that includes GlobalFirepower, a data-driven property used in ranking the top military powers of the world, WDMMA.org (World Directory of Modern Military Aircraft), WDMMW.org (World Directory of Modern Military Warships), SR71blackbird.org, detailing the history of the world's most iconic spyplane, and MilitaryRibbons.info, cataloguing military medals and ribbons. Special Interest: RailRoad Junction, the locomotive encyclopedia.

©2023 www.MilitaryFactory.com • All Rights Reserved • Content ©2003-2023 (20yrs)