Sikorsky S-24

The first Sikorsky S-24 Type G-1 Il&apos;ya Muromets four-engine bomber flew in December 1915. Four Sikorsky S-24 Type G-1s were completed in 1915-1916 with quad mountings various engines: 150hp Sunbeam, 125hp Argus, 140hp Argus, and 160hp Sunbeams respectively.