In 1926 he transferred to TsAGI, to the design office of Andrei Tupolev in the brigade of Vladimir Petlyakov, where he participated in the strength calculations of the ANT-6, ANT-7, ANT-9, ANT-14, ANT-20 aircraft.

Soon the Petlyakov team was transformed into a separate design bureau from 1931 where Belyaev took the post of chief of the settlement brigade.

In 1935, a competition for high-speed transport aircraft was announced by the Aviation All-Union Scientific Engineering and Technical Society (AviaVNITO) and the newspaper “At the Wheel”.

Viktor Belyaev's design team introduced a model of a twin-engine and two-body aircraft with an interesting pattern, called AviaVNITO-3.

The project sparked great interest, and was among the winners of the competition and was recommended for construction, but in the end, none of the competing aircraft were built.

[4] Record glider of a tailless scheme with a backward swept wing with a central part in the form of a “seagull”.

The Beljajew DB-LK was built and flew satisfactorily in 1939 and in 1940 it was presented to the public during the Moscow parade over the Red Square.

His older brothers and sister also emigrated after the revolution: Alexander (1891-1977) to Berlin, Nikolay (1892-1969) to Paris, and Ksenia (1894-1985) to Nice.