Two-seat monoplane reconnaissater with 150hp Salmson engine. Little is known - just climb to 2000m was 20min. Overall performance was mediocre.

First Lebed-XXI was accepted for service on August 30, 1917. Later six more were built. Was seen flying until 1921.

  • "History of aircraft construction in the USSR", Vol.1 p.185;

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