[1][2] The S-51D is a 70% scale version of the World War II P-51D Mustang fighter aircraft.

The prototype took flight on 30 March 1994 and by late June had completed its 40 hours of test flying.

[1] The S-51D Mustang features a cantilever low-wing, a two-seats-in-tandem enclosed cockpit under a bubble canopy, retractable conventional landing gear, and a single engine in tractor configuration.

With full fuel of 70 U.S. gallons (260 L; 58 imp gal) the payload for the pilot, passenger, and baggage is 380 lb (170 kg).

[1] The manufacturer estimated the construction time from the supplied standard kit as 2000 hours.