Sikorsky Ilya Muromets
The Sikorsky Ilya Muromets (Russian: Сикорский Илья Муромец; versions S-22, S-23, S-24, S-25, S-26 and S-27) was a class of Russian pre-World War I large four-engine commercial airliners and military heavy bombers used during World War I by the Russian Empire. The aircraft series was named after Ilya Muromets, a hero in Russian folklore.