Yakovlev Yak-100

The Yakovlev Yak-100, first designated Yak-22, was a single-engine transport helicopter developed in the USSR in 1948 and the Yakovlev bureau's second helicopter. It was built in direct competition with Mikhail Mil's Mi-1 and strongly resembled the Sikorsky H-5, with a conventional main and tail rotor driven by an Ivchenko AI-26GRFL radial piston engine and a long greenhouse canopy giving good visibility. Vibration was tackled by moving the rotor blade centre of gravity behind the flexural axis. Manufacturer trials ended in June 1950 and state trials succeeded, but the Mi-1 was already in production, so the Yak-100 was not produced.