Lambda wing
A stealth-oriented wing shape with a lambda-shaped trailing edge.
A lambda wing gets its name from its trailing edge, which mirrors the shape of the Greek capital letter lambda (Λ). Compared to a delta wing, this design offers a much smaller radar cross section, which is why it appears frequently on stealth aircraft—most notably the Northrop B-2 Spirit and Northrop Grumman B-21 Raider. Like those strategic bombers, lambda-winged aircraft are typically tailless.
The McDonnell Douglas X-36, first flown in 1997, was an early test of a lambda wing on a smaller platform. Similar configurations have since been adopted for unmanned combat aerial vehicles (UCAVs), including the Boeing X-45, Northrop Grumman X-47B, Dassault nEUROn, and BAE Systems Taranis. The UK-Italian-Japanese Global Combat Air Programme looked at a lambda wing but later dropped it. Lockheed Martin’s “Vectis” proposal for the Collaborative Combat Aircraft program does use the design.
In 2023, researchers at Beihang University suggested adding moving wingtips to fix aerodynamic instabilities—the same issues that caused a B-2 crash at Andersen Air Force Base in 2008. The Chinese Shenyang J-50, reportedly flight-testing since 2024, is said to employ a lambda wing with moving wingtips. A tailless lambda-wing UCAV called “Type A” was shown during China’s 2025 Victory Day Parade. As for the Boeing F-47, speculation links its wing shape to the X-36, the Boeing Bird of Prey, and the IAIO Qaher-313.
- First flight experiment
- 1997 (McDonnell Douglas X-36)
- Notable aircraft
- Northrop B-2 Spirit, Northrop Grumman B-21 Raider, McDonnell Douglas X-36, Boeing X-45, Northrop Grumman X-47B, Dassault nEUROn, BAE Systems Taranis
- Proposed use
- Lockheed Martin's 'Vectis' proposal for the Collaborative Combat Aircraft program
- Reported flight testing since
- 2024 (Shenyang J-50)
- Displayed at parade
- 2025 China Victory Day Parade (tailless lambda wing UCAV 'Type A')
Lore & Background
An early experiment with a lambda wing on smaller aircraft was the McDonnell Douglas X-36, which first flew in 1997. Similar designs have been used on unmanned combat aerial vehicles (UCAVs), including the Boeing X-45, Northrop Grumman X-47B, Dassault nEUROn, and BAE Systems Taranis. The UK-Italian-Japanese Global Combat Air Programme considered but abandoned a lambda wing design. The wing is used in Lockheed Martin's 'Vectis' proposal for the Collaborative Combat Aircraft program.
In 2023, Beihang University researchers proposed moving wingtips as a solution to the wing’s aerodynamic instabilities, which caused the 2008 Andersen Air Force Base B-2 crash. The Chinese Shenyang J-50, known to be flight testing since 2024, is reported to use a lambda wing with moving wingtips. A tailless lambda wing UCAV dubbed 'Type A' was displayed during the 2025 China Victory Day Parade.
The Boeing F-47 has been speculated to use a wing that resembles those of the X-36, the Boeing Bird of Prey, and IAIO Qaher-313.
Reader's Guide
The lambda wing's significance lies primarily in its stealth characteristics, offering a dramatically smaller radar cross section than a delta wing, which has led to its adoption on major strategic bombers like the Northrop B-2 Spirit and Northrop Grumman B-21 Raider. Its use on tailless aircraft is common, as seen on these bombers. The design has been explored on smaller aircraft since the 1997 flight of the McDonnell Douglas X-36, and has been applied to several UCAVs including the Boeing X-45, Northrop Grumman X-47B, Dassault nEUROn, and BAE Systems Taranis. The wing's legacy includes consideration for next-generation programs: the UK-Italian-Japanese Global Combat Air Programme considered but abandoned it, while Lockheed Martin's 'Vectis' proposal for the Collaborative Combat Aircraft program uses it. Aerodynamic instabilities associated with the lambda wing were highlighted by the 2008 Andersen Air Force Base B-2 crash, leading to a 2023 proposal by Beihang University researchers for moving wingtips as a solution. This concept appears to have been adopted on the Chinese Shenyang J-50, reported to be flight testing since 2024 with moving wingtips. The Boeing F-47 has been speculated to use a similar wing design.
Did You Know?
- The lambda wing's trailing edge resembles the Greek uppercase letter lambda (Λ).
- Aerodynamic instabilities of the lambda wing were linked to the 2008 Andersen Air Force Base B-2 crash.
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