Sikorsky S-27

Three S-27 Type E Il&apos;ya Muromets four-engine bombers were created near the end of 1916. They were the largest of the breed and included a crew of eight with five machine-gun positions, including an aft-facing belly position. The prototype arrived at the front in early 1917. Five more were built during 1917, but they only saw service with the Soviet air force.