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A key advance was the invention of the first liquid-fuelled rocket in 1926 by the American Robert Goddard in Auburn, Massachusetts. Goddard is considered to be one of the fathers of the modern rocket era.
Rocket-powered jet aircraft were pioneered in Germany. The first aircraft to fly under rocket power was the Lippisch Ente, in 1928. The Ente had previously been flown as a glider. The next year, in 1929, the Opel RAK.1 became the first purpose-built rocket plane to fly.rank Whittle, an English inventor and RAF officer, developed the concept of the jet engine in 1928, Hans von Ohain in Germany, a decade later developed the concept independently at the end of the 1930s.