Igor Sikorsky is considered to be the "father" of helicopters not because he was the first to invent it, but because he invented the first successful helicopter upon which further designs were based upon. One of aviation's greatest designers, Russian-born Igor Sikorsky began work on helicopters as early as 1910.
Igor Ivanovich Sikorsky was a Russian–American aviation pioneer in both helicopters and fixed-wing aircraft. His first success came with the S-2, the second aircraft of his design and construction. ..
