The ScaleWings SW51 Mustang, formerly marketed as the FK-Lightplanes FK51 Mustang, is an Austrian ultralight, light-sport aircraft and homebuilt aircraft that was designed by ScaleWings of Strasswalchen, Austria and was initially produced by FK-Lightplanes of Krosno, Poland, who introduced it publicly at the AERO Friedrichshafen show in 2013.

[1][2][3][4] Similar to the P-51 Mustang that it is based upon, the SW51 features a cantilever low-wing, a two-seats in tandem enclosed cockpit under a bubble canopy, fixed or retractable conventional landing gear and a single engine in tractor configuration.

The Mustang features electro-hydraulic retractable landing gear, hydraulic disc brakes on the main wheels, dual controls and electrically-operated flaps.

[3][4] In a 2023 review for AVweb, Kitplanes Editor-at-Large, Paul Dye wrote, "What makes this latest entry in the Mustang look-alike contest special?

Making composite structural parts in female molds allows a surface finish that simulates every rivet and screw in the original Mustang.