Sikorsky H-5/S-51 (USA) ✈ WESTLAND WS-51 DRAGONFLY (UK) ✈ Yakovlev Yak-100/Yak22 (USSR)

Sikorsky H-5/S-51 (USA). First flight: 18 September 1943 (WIKI)

Westland WS-51 Dragonfly (UK). First flight: 5 October 1948 (WIKI)

In December 1946 an agreement was signed between Westland Aircraft and Sikorsky to allow a British version of the S-51 to be manufactured under license in the United Kingdom. These would be powered by the 500 hp Alvis Leonides radial engine. A modified version was also developed by Westland as the Westland Widgeon, but it was commercially unsuccessful.
— Wikipedia

Yakovlev Yak-100/ Yak-22 (USSR). FIRST FLIGHT: May 8, 1948. (WIKI)

The Yak-100 (initially designated Yak-22) was developed in direct competition with Mikhail Mil’s Mi-1. Bearing a striking resemblance to the Sikorsky H-5 (purely coincidental) the Yak-100 had a conventional main and anti-torque rotor configuration, driven by an Ivchenko AI-26GRFL radial piston engine. The pilot and crewman/passenger sat under a long greenhouse-style canopy, with very good visibility.
— Wikipedia

Antonov An-12 (USSR) ✈ Short Belfast (UK) ✈Shaanxi Y-8 (China)

Antonov An-12 (USSR). First flight: 16 December 1957.  (WIKI)


Short Belfast (UK). First flight: 5 January 1964 (WIKI)

Shaanxi Y-8 (China). First flight: December 1974 (WIKI)

The Shaanxi Y-8 or Yunshuji-8 (Chinese: 运-8) aircraft is a medium size medium range transport aircraft produced by Shaanxi Aircraft Corporation in China, based on the Soviet Antonov An-12. It has become one of China’s most popular military and civilian transport/cargo aircraft, with many variants produced and exported. Although the An-12 is no longer made in Ukraine, the Chinese Y-8 continues to be upgraded and produced. An estimated 169 Y-8 aircraft had been built by 2010.
— Wikipedia