The MC-4 was a larger version of the earlier HERC JOV-3 tandem-rotor helicopter and was developed by the McCulloch Aircraft Corporation.

The JOV-3 was developed by Jovanovich when he headed the Helicopter Engineering and Research Corporation.

In 1949, Jovanovich moved to the McCulloch Motors Corporation, where an enlarged helicopter, the MC-4, first flew in March 1951.

[1] The YH-30 had a steel tube framework with a light metal skin, A single 200  hp Franklin piston engine was horizontally mounted amidships and powered two intermeshing tandem rotors.

No civil or military orders were received and Jovanovich formed his own company, the Jovair Corporation, where he modified the MC-4C as a prototype for a four-seat private helicopter designated the Sedan 4E.