, the world’s first four-engine passenger aircraft, which was later used as a bomber during World War I. Transoceanic Flying Boats: His company, Sikorsky Aircraft (now part of Lockheed Martin), built the famous

Igor Sikorsky retired from active management of his company in 1957 but remained a consultant until his death in 1972. The Sikorsky Aircraft Corporation lives on as a global leader in aviation, producing legendary aircraft like the UH-60 Black Hawk and the CH-53K King Stallion.

Before he was building helicopters in America, Igor Sikorsky was a young, ambitious engineer in pre-revolutionary Russia. His early work established a series of "firsts" that set the foundation for multi-engine aviation. The S-21 Russky Vityaz

It featured an unprecedented structural survival rate against enemy fire.

Sikorsky's fascination with rotorcraft began in the early 1930s. He envisioned a flying machine that could take off and land vertically, hover, and maneuver with ease. After years of experimentation and prototyping, Sikorsky designed and built the VS-300, the first successful single-rotor helicopter. On September 14, 1939, the VS-300 made its maiden flight, piloted by Sikorsky himself.

In 1912, Sikorsky became Chief Engineer of the aircraft division for the Russo-Baltic Carriage Works in St. Petersburg. There, he pushed the boundaries of aircraft design. The result was the , a massive biplane that became the first successful four-engine aircraft to take flight when Sikorsky piloted it on May 13, 1913. It was a revolutionary machine for its time, featuring an enclosed cabin for passengers and a toilet.