Alexander Martin Lippisch (November 2, 1894 – February 11, 1976) was a German aeronautical engineer, a pioneer of aerodynamics who made important contributions to the understanding of tailless aircraft, delta wings and the ground effect, and also worked in the U.S. Within the Opel-RAK program, he was the designer of the world's first rocket-powered glider.
|Died||February 11, 1976 (aged 81)|
|Projects||Messerschmitt Me 163|
|Significant advance||first rocket plane|
first delta wing to fly
first mass-produced rocket fighter
He developed and conceptualized delta wing designs which functioned practically in supersonic delta wing fighter aircraft as well as in hang gliders. People he worked with continued the development of the delta wing and supersonic flight concepts over the 20th century. His most famous designs are the Messerschmitt Me 163 rocket-powered interceptor: 174 and the Dornier Aerodyne.
Lippisch was born in Munich, Kingdom of Bavaria. He later recalled that his interest in aviation began with a demonstration conducted by Orville Wright over Tempelhof Field in Berlin in September 1909. Nonetheless, he planned to follow his father's footsteps into art school, until the outbreak of World War I intervened. During his service with the German Army, between 1915–1918, Lippisch had the chance to fly being an aerial photographer and mapper.
Following the war, Lippisch worked with the Zeppelin Company, and it was at this time that he first became interested in tailless aircraft. In 1921, his first design to be built, by his friend Gottlob Espenlaub, was the Espenlaub E-2 glider. This was the beginning of a research programme that would result in some fifty designs throughout the 1920s and 1930s. Lippisch's growing reputation saw him appointed in 1925 to the director of the Rhön-Rossitten Gesellschaft (RRG), a glider organisation including research groups and construction facilities.
Lippisch also designed conventional gliders at this time, including the Wien of 1927 and its successor the Fafnir of 1930. In 1928, partaking in the Opel-RAK program by Fritz von Opel and Max Valier, Lippisch's tail-first Ente (Duck) was equipped with powder rockets by Friedrich Wilhelm Sander's company and became the first aircraft to fly under rocket power. From 1927, he resumed his tailless work, leading to a series of designs named Storch I – Storch IX (Stork I-IX), mostly gliders. These designs attracted little interest from the government and private industry.
Experience with the Storch series led Lippisch to concentrate increasingly on delta-winged designs. The Delta I was the world's first tailless delta wing aircraft to fly (in 1931). This interest resulted in five aircraft, numbered Delta I – Delta V, which were built between 1931 and 1939. In 1933, RGG had been reorganised into the Deutsche Forschungsanstalt für Segelflug (German Institute for Sailplane Flight, DFS) and the Delta IV and Delta V were designated as the DFS 39 and DFS 40 respectively.
In early 1939, the Reichsluftfahrtsministerium (RLM, Reich Aviation Ministry) transferred Lippisch and his team to work at the Messerschmitt factory in Augsburg, in order to design a high-speed fighter aircraft around the rocket engines then under development by Hellmuth Walter. The team quickly adapted their most recent design, the DFS 194, to rocket power, the first example successfully flying in early 1940. This successfully demonstrated the technology for what would become the Messerschmitt Me 163 Komet.
Although technically novel, the Komet did not prove to be a successful weapon and friction between Lippisch and Messerschmitt was frequent. In 1943, Lippisch transferred to Vienna's Aeronautical Research Institute (Luftfahrtforschungsanstalt Wien, LFW) in Wiener Neustadt, in an own design bureau to concentrate on the problems of high-speed flight. That same year, he was awarded a doctoral degree in engineering by the University of Heidelberg. With him came the mathematician Hermann Behrbohm on half time (and continued half time for Messerschmitt in Oberammergau to where the development activities were moved into the underground facility after the air raids on Augsburg the 25 February 1944).
Wind tunnel research in 1939 had suggested that the delta wing was a good choice for supersonic flight, and Lippisch set to work designing a supersonic, ramjet-powered fighter, the Lippisch P.13a. By the time the war ended, however, the project had only advanced as far as a development glider, the DM-1.
Even though the Lippisch P.13a never flew, it and Lippisch's research and development had a significant importance for the development of the delta wing and supersonic flight concepts and supersonic-delta wing-fighter aircraft.
All this later development being funded by governments in the 1950s (like the Swedish Defence Act of 1958) to meet the need to be able to swiftly attack strategic nuclear weapons-bombers such as the Tupolev Tu-16 before they reached their targets. Lippisch's delta wing concept proved to be very steady and efficient in very high speed supersonic flight.
The research of the Messerschmitt and Lippisch offices were continued by:
Advances in jet engine design were making Lippisch's ideas more practical, and Convair became interested in a hybrid (mixed power) jet/rocket design which they proposed as the F-92. In order to gain experience with the delta wing handling at high speeds, they first built a test aircraft, the 7002 which, on June 9, 1948, became the first jet-powered delta-wing aircraft to fly. Although the U.S. Air Force lost interest in the F-92, the next test model 7003 was designated the XF-92A. This led Convair to proposing delta wing for most of their projects through the 1950s and into the 1960s, including the F-102 Delta Dagger, F-106 Delta Dart and B-58 Hustler.
From 1950–1964, Lippisch worked for the Collins Radio Company in Cedar Rapids, Iowa, which had an aeronautical division. It was during this time that his interest shifted toward ground effect craft. The results were an unconventional VTOL aircraft (eventually becoming the Dornier Aerodyne) and an aerofoil boat research seaplane X-112, flown in 1963. However, Lippisch contracted cancer, and resigned from Collins.
When he recovered in 1966, he formed his own research company, Lippisch Research Corporation, and attracted the interest of the West German government. Prototypes for both the aerodyne and the ground-effect craft RFB X-113 (1970) then RFB X-114 (1977) were built, but no further development was undertaken. The Kiekhaefer Mercury company was also interested in his ground-effect craft and successfully tested one of his designs as the Aeroskimmer, but also eventually lost interest.