Military Wiki
Role Light helicopter
Manufacturer McCulloch Aircraft Corporation
Designer Drago Jovanovich
First flight 1951
Primary users United States Army
United States Navy

The McCulloch Model MC-4 was an American tandem-rotor helicopter and was the first helicopter developed by McCulloch Aircraft Corporation, a division of McCulloch Motors Corporation.[1] It was evaluated by the United States Army as the YH-30 and the United States Navy as the XHUM-1.

Design and development

The MC-4 was a larger version of the earlier Jovanovich 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. The JOV-3 first flew in 1948. In 1949 Jovanovich moved to the McCulloch Motors Corporation where an enlarged helicopter the MC-4 first flew in March 1951. It was followed by a similar MC-4C and three evaluation helicopters for the United States Army (as the YH-30). The MC-4C was slightly larger than the MC-4. When the MC-4C was certified in 1953 it was the first tandem-rotor helicopter to be certified in the United States for commercial use. Three examples were evaluated by the United States Army as the YH-30, but Army's evaluation showed the helicopter to be underpowered.[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. It had a fixed wheeled tricycle landing gear with a castering nose wheel. 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. The Sedan 4E was powered by 210 hp Franklin 6A-335 engine. A version with a turbo-charged engine was designed as the Sedan 4ES and a more basic Sedan 4A for agricultural use. By 1965 a small number of Sedan helicopters were built. In the early 1970s McCulloch regained the rights to the helicopter designs.


McCulloch MC-4
Prototype with a 165hp Franklin engine, two built, one for evaluation by the United States Navy.
McCulloch MC-4A
Variant for evaluation by the United States Navy as the XHUM-1, two built.
McCulloch MC-4C
Protoype with a 200hp Franklin engine, one built and an additional three for United States Army evaluation as the YH-30.
Jovair Sedan 4E
Production civil four-seat version powered by a 210hp Franklin 6A-335 engine.
Jovair Sedan 4ES
Sedan with a turbo-charged 225hp Franklin engine.
Jovair Sedan 4A
Simplified agricultural version.

Military designations

Military version of the MC-4C, three built.
Two MC-4As for evaluation by the United States Navy, later re-designated HUM-1.


United States


In 2008 two MC-4Cs are still registered in the United States. The Pima Air and Space Museum has a HUM-1, registration N4072K. The Yanks American Air Museum at Chino are restoring a MC-4C to flying condition although they have no plans to fly it. It may be N4071K or N4091K. One of the three YH-30 miitary prototypes is preserved by the US Army Aviation Museum at Fort Rucker, Alabama. It is c/n 001 and has the military serial 52-5837. As of April 2013 it remains in a storage building and is not on public display.


An MC-4C was used in the 1954 science fiction production Gog.

Specifications (YH-30)

General characteristics

  • Crew: 2
  • Length: 32 ft 0 in ( m)
  • Main rotor diameter: 2× 22 ft 0 in ( m)
  • Height: 9 ft 2 in ( m)
  • Empty weight: 1200 lb (544 kg)
  • Gross weight: 2000 lb (907 kg)
  • Powerplant: 1 × Franklin O-335-6 (6A4-200-C6) piston, 200 hp (147.1 kW)


  • Maximum speed: 105 mph (168.98 km/h)
  • Range: 200 miles (321.86 km)


  1. 1.0 1.1 Harding, Stephen U.S. Army Aircraft Since 1947, Airlife Publishing, Ltd. 1990. ISBN 1-85310-102-8
  • John Andrade, U.S.Military Aircraft Designations and Serials since 1909, Midland Counties Publications, 1979, ISBN 0-904597-22-9 (Page 121)
  • The Illustrated Encyclopedia of Aircraft (Part Work 1982-1985), 1985, Orbis Publishing, Page 2213/2214.

External links

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