BI-Bereznyak-Isaev, or short-range Fighter-rocket aircraft, the first Soviet aircraft with a liquid-propellant rocket engine. The first test flight of the BI-1 took place on may 15, 1942 under the control of a test pilot
G. Ya. Bakhchivandzhi.
All, whom interesting the puzzle tragedy with a group of I. Dyatlov you can subscribe on the second canal: "the OLD ARCHIVE" let us to publish video on collected materials about this tragedy, will and other themes. / @staryi-arxiv
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