The most advanced of all ' Lebed' family. Its Salmson140 or 150hp engine was well cowled and equipped with large spinner. Exhaust stacks send gases down the main landing gear struts. Same struts carried two radiators. Forward section of the fuselage was rounded to accommodate the engine and covered with plywood. Tail section was of strut-brace structure, covered with fabric.

Intended as a 2-seat reconnaissater. Flown in August 1917, demonstrating good performance.

Few built before the end of 1917.

  • "History of aircraft construction in the USSR", Vol.1 p.184;

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