Russkii Baltiskii Vagon Zavod, Russo-Baltic Wagon Works, moved from Riga to St Petersburg, decided to build aircraft April 1912 and hired I.I. Sikorsky as chief designer. Built giant aeroplane named Grand, span 88 ft 7 in (27 m) (2 x 100-hp Argus), flown 2 March 1913. This later given 4 engines and developed into Ilya Mourometz series of reconnaissance-bombers, 80 built 1913-18, many going on to serve after Bolshevik revolution.