The HERC JOV-3 was developed into the McCulloch MC-4 but in 1960, Drago Jovanovich regained his independence and reworked his small tandem rotor helicopter as the Jovair 4. The 'four-place, four-door' Sedan was still marketed much like a car but by the 1960s the design was rather long in the tooth. Photo from: Vertical Flight Society