Jim Younkin of Springdale, Arkansas completed a frame of this aircraft in 1989 and a homebuilt model earlier in 1985 with the help from Bud Dake.

Bud Dake suggested they design a 2-seat aircraft which would be as fast as the Mister Mulligan but powered by a smaller P&W R-985 engine.

Younkin then designed a scale model which was somewhat of a cross between the Benny Howard-designed Mister Mulligan but with the fuselage shape of a Monocoupe.

The Mullicoupes are a clean-sheet design utilizing a steel tube fuselage double-covered in fabric with built up wood wings skinned in aircraft plywood.

The Red Younkin-owned Mullicoupe N273X suffered a loss of power which resulted in a forced landing in a field near Siloam Springs, Arkansas on November 10, 2009.