The Russian inventor Igor Sikorsky flew the self-designed Russky Vityaz, the world's first four-engine fixed-wing aircraft.

Igor Ivanovich Sikorsky was a Russian-American aviation pioneer in both helicopters and fixed-wing aircraft. His first success came with the Sikorsky S-2, the second aircraft of his design and construction. His fifth airplane, the S-5, won him national recognition and F.A.I. pilot's license number 64. His S-6-A received the highest award at the 1912 Moscow Aviation Exhibition, and in the fall of that year the aircraft won first prize for its young designer, builder and pilot in the military competition at Saint Petersburg. In 1913, the Sikorsky-designed Russky Vityaz (S-21) became the first successful four-engine aircraft to take flight. He also designed and built the Ilya Muromets family of four-engine aircraft, an airliner which he redesigned to be the world's first four-engine bomber when World War I broke out.