Perhaps the inspiration for American designers came from the Soviet Union, the Yakovlev Yak-24, a twin-rotor helicopter similar to the CH-47, but with very limited production and service. Born in the 1950s, the Soviet Yakovlev Yak-24 is considered the world's first operational tandem rotor helicopter.

The Yak-24 had its first flight in July 1952, and was officially put into service in 1955.

The Yak-24 could carry up to 19 airborne troops, 12 stretchers or 2,000 kg of cargo, including field guns or GAZ-69 army car.

Other than its excellent carrying capacity, the maximum speed of the Yak-24 was quite low, only about 175 km/h and a range of 265 km.

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