Eufaula, Alabama. Eufaula is the largest city in Barbour County, Alabama, United States.
Leonardo da Vinci (1452â1519) is generally credited with inventing the helicopter, but the first practical design was developed only in the 1930s by Russian-born Igor Sikorsky (1889â1972). Today, typical uses for helicopters include military transportation and air-sea rescue.eonardo da Vinci (1452â1519) is generally credited with inventing the helicopter, but the first practical design was developed only in the 1930s by Russian-born Igor Sikorsky (1889â1972). Today, typical uses for helicopters include military transportation and air-sea rescue.
Hans von Ohain is considered the designer of the first operational turbojet engine. Frank Whittle was the first to register a patent for the turbojet engine in 1930. Hans von Ohain was granted a patent for his turbojet engine in 1936. However, Hans von Ohain's jet was the first to fly in 1939.Frank Whittle's jet first flew in in 1941.Source(s): http://inventors.about.com/library/inven...930 Applies for a patent for the jet engine concept - a reaction motor suitable for aircraft propulsion (granted April 1931). The idea is ignored by the Air Ministry. 1931-32 Test pilot on floatplanes and flying boats 1934 Flight Lieutenant Frank Whittle sent to Cambridge University as a mature student by the RAF.