Starting his work in Kiev, Sikorsky's early attempts at helicopters in 1909 and 1910 failed due to a lack of lightweight, powerful engines. He pivoted to fixed-wing aircraft, where he achieved rapid success: Igor Sikorsky | History | Research Starters - EBSCO
Based on the name provided, it is most likely you are referring to , the aviation pioneer who is widely considered the father of the modern helicopter. While he was an engineer and businessman rather than a military "Captain" by rank (though he is often referred to as a "Captain of Industry" or a commanding figure in aviation history), his work aligns most closely with the context of "Sikorsky." captain sikorsky work