Sikorsky Russky Vityaz
The Sikorsky Russky Vityaz (Russian: Русский витязь), or Russian Knight (S-21), previously known as the Bolshoi Baltisky (Russian: Большой Балтийский) (The Great Baltic) in its first four-engined version, was the first four-engine aircraft in the world, designed by Igor Sikorsky and built at the Russian Baltic Railroad Car Works (Russo-Baltiiskyi Vagonnyi Zavod or R-BVZ) in Saint Petersburg in early 1913. == Development == Sikorsky conceived the S-21 design in 1911, when no known aircraft could lift more than 600 kilograms (1,323 lb).