The YH-30 was one of the smallest helicopters to be built with a tandem layout. The craft had relatively simple construction, consisting of a steel tube framework to which was attached a light metal skin. Development began in 1946 with a small 2-seat prototype was built with the designation JOV-3. This aircraft, powered by a 125hp Lycoming O-290, was flown successfully in 1948. It had 3-blade rotors of 5.64m diameter, a gross weight of 618kg, a maximum speed of 161km/h and a range of 221km. The Model MC-4 tandem-rotor light helicopter was the first aircraft to be developed by McCulloch Motors' Aircraft Division, and made its first flight in March 1951. The Army acquired three examples of the slightly modified Model MC-4C in 1952 for engineering test and evaluation, designating the machines YH-30. The Army's found the helicopter to be underpowered and its drive system to be overly complex. The three evaluation machines were declared surplus in mid-1953 and disposed of.
The US Navy also received two similar XHUM-1 (Bu. 133817 and 133818). Unfortunately, neither the Army nor the Navy could find a role for the MC-4 and McCulloch subsequently lost interest
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