Adolf Busemann
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Adolf Busemann (20 April 1901 – 3 November 1986) was a German
aerospace engineer Aerospace engineering is the primary field of engineering concerned with the development of aircraft and spacecraft. It has two major and overlapping branches: aeronautical engineering and astronautical engineering. Avionics engineering is s ...
and influential
Nazi Nazism ( ; german: Nazismus), the common name in English for National Socialism (german: Nationalsozialismus, ), is the far-right totalitarian political ideology and practices associated with Adolf Hitler and the Nazi Party (NSDAP) in ...
-era pioneer in
aerodynamics Aerodynamics, from grc, ἀήρ ''aero'' (air) + grc, δυναμική (dynamics), is the study of the motion of air, particularly when affected by a solid object, such as an airplane wing. It involves topics covered in the field of fluid dy ...
, specialising in supersonic airflows. He introduced the concept of
swept wing A swept wing is a wing that angles either backward or occasionally forward from its root rather than in a straight sideways direction. Swept wings have been flown since the pioneer days of aviation. Wing sweep at high speeds was first investiga ...
s and, after emigrating in 1947 to the
United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country Continental United States, primarily located in North America. It consists of 50 U.S. state, states, a Washington, D.C., ...
under
Operation Paperclip Operation Paperclip was a secret United States intelligence program in which more than 1,600 German scientists, engineers, and technicians were taken from the former Nazi Germany to the U.S. for government employment after the end of World War ...
, invented the shockwave-free supersonic
Busemann biplane The Busemann biplane is a theoretical aircraft configuration invented by Adolf Busemann, which avoids the formation of N-type shock waves and thus does not create a sonic boom or the associated wave drag. However in its original form it does not ...
.


Education and early life

Born in
Lübeck Lübeck (; Low German also ), officially the Hanseatic City of Lübeck (german: Hansestadt Lübeck), is a city in Northern Germany. With around 217,000 inhabitants, Lübeck is the second-largest city on the German Baltic coast and in the state ...
,
Germany Germany,, officially the Federal Republic of Germany, is a country in Central Europe. It is the second most populous country in Europe after Russia, and the most populous member state of the European Union. Germany is situated betwee ...
, Busemann attended the
Technical University of Braunschweig The Technische Universität Braunschweig (unofficially University of Braunschweig – Institute of Technology), commonly referred to as TU Braunschweig, is the oldest ' (comparable to an institute of technology in the American system) in Germany ...
, receiving his Ph.D. in engineering in 1924.


Career and research

The next year he was given the position of aeronautical research scientist at the
Max-Planck Institute The Max Planck Society for the Advancement of Science (german: Max-Planck-Gesellschaft zur Förderung der Wissenschaften e. V.; abbreviated MPG) is a formally independent non-governmental and non-profit association of German research institutes. ...
where he joined the famed team led by
Ludwig Prandtl Ludwig Prandtl (4 February 1875 – 15 August 1953) was a German fluid dynamicist, physicist and aerospace scientist. He was a pioneer in the development of rigorous systematic mathematical analyses which he used for underlying the science of ...
, including
Theodore von Kármán Theodore von Kármán ( hu, ( szőllőskislaki) Kármán Tódor ; born Tivadar Mihály Kármán; 11 May 18816 May 1963) was a Hungarian-American mathematician, aerospace engineer, and physicist who was active primarily in the fields of aeronaut ...
, Max Munk and
Jakob Ackeret Jakob Ackeret, FRAeS (17 March 1898 – 27 March 1981) was a Swiss aeronautical engineer. He is widely viewed as one of the foremost aeronautics experts of the 20th century. Birth and education Jakob Ackeret was born in 1898 in Switzerland. He ...
. In 1930 he was promoted to professor at
University of Göttingen The University of Göttingen, officially the Georg August University of Göttingen, (german: Georg-August-Universität Göttingen, known informally as Georgia Augusta) is a public research university in the city of Göttingen, Germany. Founded ...
. He held various positions within the German scientific community during this period, and during the war he was the director of the Braunschweig Laboratory, a famous research establishment.Adolf Busemann, 1901-1986
memorial by Robert Jones
Busemann discovered the benefits of the
swept wing A swept wing is a wing that angles either backward or occasionally forward from its root rather than in a straight sideways direction. Swept wings have been flown since the pioneer days of aviation. Wing sweep at high speeds was first investiga ...
for aircraft at high speeds, presenting a paper on the topic at the
Volta Conference The Volta Conference was the name given to each of the international conferences held in Italy by the Royal Academy of Science in Rome, and funded by the Alessandro Volta Foundation. In the interwar period, they covered a number of topics in sci ...
in Rome in 1935. The paper concerned
supersonic Supersonic speed is the speed of an object that exceeds the speed of sound ( Mach 1). For objects traveling in dry air of a temperature of 20 °C (68 °F) at sea level, this speed is approximately . Speeds greater than five times ...
flow only. At the time of his proposal, flight much beyond 300 miles per hour had not been achieved and it was considered an academic curiosity. Nevertheless, he continued working with the concept, and by the end of the year had demonstrated similar benefits in the
transonic Transonic (or transsonic) flow is air flowing around an object at a speed that generates regions of both subsonic and supersonic airflow around that object. The exact range of speeds depends on the object's critical Mach number, but transoni ...
region as well. As director of the Braunschweig labs, he started an experimental
wind tunnel Wind tunnels are large tubes with air blowing through them which are used to replicate the interaction between air and an object flying through the air or moving along the ground. Researchers use wind tunnels to learn more about how an aircraft ...
test series of the concept, and by 1942 had amassed a considerable amount of useful technical data. As the need for higher speed aircraft became pressing in Germany, the Messerschmitt Me P.1101 was developed to flight test these designs. When
World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the World War II by country, vast majority of the world's countries—including all of the great power ...
ended, a team of American aerodynamicists travelled to Germany as part of
Operation Lusty Operation LUSTY (LUftwaffe Secret TechnologY) was the United States Army Air Forces' effort to capture and evaluate German aeronautical technology during and after World War II. Overview During World War II, the U.S. Army Air Forces Intelligence ...
. The team included von Kármán, Tsien Hsue-shen,
Hugh Dryden Hugh Latimer Dryden (July 2, 1898 – December 2, 1965) was an American aeronautical scientist and civil servant. He served as NASA Deputy Administrator from August 19, 1958, until his death. Biography Early life and education Dryden was born in ...
and
George S. Schairer George S. Schairer (May 19, 1913 – October 28, 2004) was an aerodynamicst at Consolidated Aircraft and Boeing whose design innovations became standard on virtually all types of military and passenger jet planes. Early life George Swift Schaire ...
from
Boeing The Boeing Company () is an American multinational corporation that designs, manufactures, and sells airplanes, rotorcraft, rockets, satellites, telecommunications equipment, and missiles worldwide. The company also provides leasing and ...
. They reached the Braunschweig labs on 7 May, where they found a mass of data on the swept wing concept. When they asked Busemann about it, "his face lit up" and he said, "Oh, you remember, I read a paper on it at the Volta Conference in 1935". Several members of the team did remember the presentation, but had completely forgotten the details in terms of what the presentation was actually about. Realizing its importance, Schairer immediately wrote to Boeing and told them to investigate the concept, leading to a re-modeling of the
B-47 Stratojet The Boeing B-47 Stratojet (Boeing company designation Model 450) is a retired American long-range, six-engined, turbojet-powered strategic bomber designed to fly at high subsonic speed and at high altitude to avoid enemy interceptor aircraft. ...
with a swept wing. Busemann's work, along with similar work by Robert T. Jones in the US, led to a revolution in aircraft design. Near the end of the war, Busemann started studies of airflow around
delta wing A delta wing is a wing shaped in the form of a triangle. It is named for its similarity in shape to the Greek uppercase letter delta (Δ). Although long studied, it did not find significant applications until the Jet Age, when it proved suita ...
s, leading to the development of his supersonic conical flow theory. This reduced the complexity of the airflow to a
conformal mapping In mathematics, a conformal map is a function that locally preserves angles, but not necessarily lengths. More formally, let U and V be open subsets of \mathbb^n. A function f:U\to V is called conformal (or angle-preserving) at a point u_0\in ...
in the complex plane, and was used for some time in the industry. Busemann moved to the United States in 1947 and started work at
NACA The National Advisory Committee for Aeronautics (NACA) was a United States federal agency founded on March 3, 1915, to undertake, promote, and institutionalize aeronautical research. On October 1, 1958, the agency was dissolved and its assets ...
's
Langley Research Center The Langley Research Center (LaRC or NASA Langley), located in Hampton, Virginia, United States of America, is the oldest of NASA's field centers. It directly borders Langley Air Force Base and the Back River on the Chesapeake Bay. LaRC has f ...
. In 1951 he gave a talk where he described the fact that air at near supersonic speeds no longer varied in diameter with speed according to Bernoulli's theorem but remained largely incompressible and acting as fixed diameter pipes, or as he put it, 'streampipes'. He jokingly referred to aerodynamicists as needing to become 'pipe fitters'. This talk led an attendee, Richard Whitcomb, to try and work out what these pipes were doing in a transonic test he was performing, inventing the
Whitcomb area rule The Whitcomb area rule, named after NACA engineer Richard Whitcomb and also called the transonic area rule, is a design procedure used to reduce an aircraft's drag at transonic speeds which occur between about Mach 0.75 and 1.2. For supersonic ...
a few days later. At Langley, he worked primarily on the problems of
sonic boom A sonic boom is a sound associated with shock waves created when an object travels through the air faster than the speed of sound. Sonic booms generate enormous amounts of sound energy, sounding similar to an explosion or a thunderclap to ...
s, and spent a considerable amount of effort looking at ways to characterize them, and potentially eliminate them. He later invented Busemann's Biplane, a supersonic design he originally proposed in 1936 that emits no
shock wave In physics, a shock wave (also spelled shockwave), or shock, is a type of propagating disturbance that moves faster than the local speed of sound in the medium. Like an ordinary wave, a shock wave carries energy and can propagate through a me ...
s and has no
wave drag In physics, mathematics, and related fields, a wave is a propagating dynamic disturbance (change from equilibrium) of one or more quantities. Waves can be periodic, in which case those quantities oscillate repeatedly about an equilibrium (re ...
, at the cost of having no lift. Busemann also did early work on magneto-hydrodynamics in the 1920s, as well as on cylindrical focusing of shock waves and non-steady gas dynamics. Busemann held a professorship at the
University of Colorado The University of Colorado (CU) is a system of public universities in Colorado. It consists of four institutions: University of Colorado Boulder, University of Colorado Colorado Springs, University of Colorado Denver, and the University o ...
from 1963 and suggested the use of ceramic tiles on the
Space Shuttle The Space Shuttle is a retired, partially reusable low Earth orbital spacecraft system operated from 1981 to 2011 by the U.S. National Aeronautics and Space Administration (NASA) as part of the Space Shuttle program. Its official program n ...
, which were adopted by NASA.Adolf Busemann, 85, Dead; Designer of the Swept Wing
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Awards and honors

He was awarded the
Ludwig-Prandtl-Ring The Ludwig Prandtl Ring is the highest award of the Deutsche Gesellschaft für Luft- und Raumfahrt (German Society for Aeronautics and Astronautics), awarded "for outstanding contribution in the field of aerospace engineering". The award is named ...
from the
Deutsche Gesellschaft für Luft- und Raumfahrt German Society for Aeronautics and Astronautics (DGLR; german: Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V.) is a German aerospace society. It was founded in 1912 under the name of ''Wissenschaftliche Gesellschaft für ...
(German Society for Aeronautics and Astronautics) for "outstanding contribution in the field of aerospace engineering" in 1966. He died at age 85 in
Boulder, Colorado Boulder is a home rule city that is the county seat and most populous municipality of Boulder County, Colorado, United States. The city population was 108,250 at the 2020 United States census, making it the 12th most populous city in Colora ...
.


References


External links


Oral history interview transcript with Adolf Busemann in summer 1979, American Institute of Physics, Niels Bohr Library & Archives
{{DEFAULTSORT:Busemann, Adolf 1901 births 1986 deaths German aerospace engineers Aerodynamicists University of Colorado faculty Technical University of Braunschweig alumni German emigrants to the United States People from Lübeck Fluid dynamicists Ludwig-Prandtl-Ring recipients Operation Paperclip Engineers from Schleswig-Holstein