The Mosca-Bystritsky MBbis was a fighter aircraft developed and used by the Imperial Russian Air Service during the First World War.
After being persuaded to move to Russia, the Italian aircraft designer Francesco E. Mosca worked at the Duks factory, with Bezobrasov, Lerkhe and Yankovski.
A smaller single seat version of the MB was also produced as the MBbis, 50 of which were ordered from 1916.
[1] The MB and MBbis were both constructed largely of wood with fabric covering.
[1] Powered by 80 hp (60 kW) Le Rhone 9C or Clerget 7Z engines the MBbis was armed with a single machine gun mounted, either in a fixed forward firing mount firing through the propeller fitted with deflector plates, or in angled or elevated mounts firing outside the propeller disc.