Relationships with Fellow Russian ÉmigrésEarly Aviation Career in Russia (1910-1917)Main milestonesDevelopment of the Helicopter (1930s-1940s)Sikorsky's Contributions to Rotary Wing FlightEarly Life and Education (1889-1911)Personal Life and FamilyImmigration to the United States (1919-1929)Sikorsky's Fixed-Wing Aircraft ContributionsLater Life and Legacy (1950s-1972)Main milestonesDevelopment of the Helicopter (1930s-1940s)Early Aviation Career in Russia (1910-1917)Early Life and Education (1889-1911)Immigration to the United States (1919-1929)Later Life and Legacy (1950s-1972)Personal Life and FamilyRelationships with Fellow Russian ÉmigrésSikorsky's Contributions to Rotary Wing FlightSikorsky's Fixed-Wing Aircraft Contributions
