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Air Commodore Sir Frank Whittle (1 June 1907 – 9 August 1996) was an English Royal Air Force (RAF) engineer air officer. He is credited with single handedly inventing the turbojet engine. A patent was submitted by Maxime Guillaume in 1921 for a similar invention; however, this was technically unfeasible at the time. Whittle's engines were developed some years earlier than those of Germany's Dr. Hans von Ohain who was the designer of the first operational jet engine.

Hans Joachim Pabst von Ohain (14 December 1911 – 13 March 1998) was a German engineer, and designer of the first operational jet engine. His first design ran in March 1937, and it was one of his engines that powered the first all-jet aircraft, the prototype of the Heinkel He 178 in late August 1939. In spite of these early successes, other German designs quickly eclipsed von Ohain's, and none of his engine designs entered widespread production or operational use.

Jet propulsion is thrust produced by passing a jet of matter (typically air or water) in the opposite direction to the direction of motion. By Newton's third law, the moving body is propelled in the opposite direction to the jet. It is most commonly used in the jet engine, but is also the means of propulsion utilized by NASA to power various space craft.

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