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Rocket-powered aircraft

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Rocket-powered aircraft

A rocket-powered aircraft or rocket plane is an aircraft that uses a rocket engine for propulsion, sometimes in addition to airbreathing jet engines. Rocket planes can achieve much higher speeds than similarly sized jet aircraft, but typically for at most a few minutes of powered operation, followed by a gliding flight. Unhindered by the need for oxygen from the atmosphere, they are suitable for very high-altitude flight. They are also capable of delivering much higher acceleration and shorter takeoffs. Many rocket aircraft may be drop launched from transport planes, as take-off from ground may leave them with insufficient time to reach high altitudes.

Rockets have been used simply to assist the main propulsion in the form of jet assisted take off (JATO) also known as rocket-assisted takeoff (RATO or RATOG). Not all rocket planes are of the conventional takeoff like "normal" aircraft. Some types have been air-launched from another plane, while other types have taken off vertically – nose in the air and tail to the ground ("tail-sitters").

Because of the use of heavy propellants and other practical difficulties of operating rockets, the majority of rocket planes have been built for experimental or research use, as interceptor fighters and space aircraft.

Peruvian polymath Pedro Paulet conceptualized the Avión Torpedo in 1902 – a liquid-propellant rocket-powered aircraft that featured a canopy fixed to a delta tiltwing – spending decades seeking donors for the aircraft while serving as a diplomat in Europe and Latin America. Paulet's concept of using liquid-propellant was decades ahead of rocket engineers at the time who utilized black powder as a propellant. Reports of Paulet's rocket aircraft concept first appeared in 1927 after Charles Lindbergh crossed the Atlantic Ocean in an aircraft. Paulet publicly criticized Austrian rocket pioneer Max Valier's proposal about a rocket-powered aircraft completing the journey faster using black powder, arguing that his liquid-propellant rocket aircraft from thirty years earlier would be a better option.

Paulet would go on to visit the German rocket association Verein für Raumschiffahrt (VfR) and on March 15, 1928, Valier applauded Paulet's liquid-propelled rocket design in the VfR publication Die Rakete, saying the engine had "amazing power". In May 1928, Paulet was present to observe the demonstration of a rocket car of the Opel RAK program of Fritz von Opel and Max Valier, and after meeting with the German rocket enthusiasts. VfR members began to view black powder as a hindrance for rocket propulsion, with Valier himself believing that Paulet's engine was necessary for future rocket development. Paulet would soon be approached by Nazi Germany to help develop rocket technology, though he refused to assist and never shared the formula for his propellant. The Nazi government would then appropriate Paulet's work while a Soviet spy in the VfR, Alexander Boris Scherchevsky, possibly shared plans with the Soviet Union.

On 11 June 1928, as part of the Opel RAK program of Fritz von Opel and Max Valier, Lippisch Ente became the first aircraft to fly under rocket power. During the following year, the Opel RAK.1 became the first purpose-built rocket plane to fly with Fritz von Opel himself as the pilot. The Opel RAK.1 flight is also considered the world's first public flight of a manned rocket plane since it took place before a large crowd and with world media in attendance.

On 28 June 1931, another ground-breaking rocket flight was conducted by the Italian aviator and inventor Ettore Cattaneo, who created another privately built rocket plane. It flew and landed without particular problems. Following this flight, the King of Italy Victor Emmanuel III appointed Cattaneo count of Taliedo; due to his pioneering role in rocket flight, his likeness is displayed in the Space Museum of Saint Petersburg as well as in the Museum of Science and Tech of Milan.

The Heinkel He 176 was the world's first aircraft to be propelled solely by a liquid-propellant rocket engine. It performed its first powered flight on 20 June 1939 with Erich Warsitz at the controls.[page needed] The He 176, while demonstrated to the Reich Air Ministry did not attract much official support, leading to Heinkel abandoning its rocket propulsion endeavours; the sole aircraft was briefly displayed at the Berlin Air Museum and was destroyed by an Allied bombing raid in 1943.

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