The Sikorsky S-1 was the first fixed wing aircraft design by Igor Ivanovich Sikorsky, a Russian-American aviation pioneer in both helicopters and fixed-wing aircraft, first success came with which aircraft?
Sikorsky S-1: The Sikorsky S-1 was the first fixed wing aircraft design by Igor Sikorsky. Igor Sikorsky:  First success came with the S-2, the second aircraft of his design and construction.
i don't know