Mr. Sikorsky is a famous aviation pioneer, best known for his invention of the helicopter. His first name is Igor, which is a four letter word that can be found in crossword puzzles. He was born in Kiev, Ukraine in 1889 and studied engineering at the Imperial Russian Technical School. He founded the Sikorsky Aircraft Corporation in 1925 and developed the first successful helicopter in 1939. He also designed the world's first four-engine airplane. Mr. Sikorsky's inventions revolutionized air travel and he is remembered as one of the most influential figures in aviation history.