Re-posting one of my posts from the other place

Image Credits: NASA / Patrick Wright (Media Usage Guidelines)

The Proteus high-altitude aircraft incorporates a gull-wing shape for its main wing and a long, slender forward canard. Designed by Burt Rutan, obviously. For more details see its Wikipedia page.

Image Credits: NASA / Carla Thomas (Media Usage Guidelines)

Technically it's a UAV.

Image Credits: National Museum of the United States Air Force (Public Domain), VIRIN 060829-F-1234S-005

While the "six turning four burning" B-36 already is a decent WeirdWing, this modification for the FICON project is probably the cherry on top.

Image Credits: author unknown, original publication 1922 France (Public Domain)

Initially intended as marine recon / bomber this machine only made a few test flights.

More images of this beast on destinationsjourney.com. More info on Wikpedia.

The No. 1 X-29 advanced technology demonstrator aircraft banks over desert terrain near NASA's Ames-Dryden Flight Research Facility.

Image Credits: NASA (public domain)

This photo shows the X-29 during a 1991 research flight. Smoke generators in the nose of the aircraft were used to help researchers see the behavior of the air flowing over the aircraft. The smoke here is demonstrating forebody vortex flow. This mission was flown September 10, 1991, by NASA research pilot Rogers Smith.

More info on Wikipedia

Image Credits: Jozef Tóth (CC BY-SA 3.0)

This particular plane served as Testbed for the M-601 engine used for the Let L-610.