HOME

TheInfoList



OR:

Wunibald Kamm (April 26, 1893 – October 11, 1966) was an automobile designer,
engineer Engineers, as practitioners of engineering, are professionals who Invention, invent, design, analyze, build and test machines, complex systems, structures, gadgets and materials to fulfill functional objectives and requirements while considerin ...
, and aerodynamicist. He is best known for his breakthrough in reducing car turbulence at high speeds; the style of car bodywork based on his research has come to be known as a Kammback or a Kamm-tail.


Design

One goal of
automotive aerodynamics Automotive aerodynamics is the study of the aerodynamics of road vehicles. Its main goals are reducing drag and wind noise, minimizing noise emission, and preventing undesired lift forces and other causes of aerodynamic instability at high spee ...
is to reduce the air
turbulence In fluid dynamics, turbulence or turbulent flow is fluid motion characterized by chaotic changes in pressure and flow velocity. It is in contrast to a laminar flow, which occurs when a fluid flows in parallel layers, with no disruption between ...
, or drag, caused by the shape of the automobile. Aerodynamic drag may be reduced either by reduction of frontal area or by reduction of drag coefficient. In bodies such as automobiles and airships, drag decreases after the rear of a car's cross-sectional area is reduced to fifty percent of the car's maximum cross section; "the best position is nearer 45 per cent of the length, and ... to have this maximum cross- section nearer the rear end than the front, and its drag has proved even less". There are other aspects of the car's design such as keeping the flow of air attached to the body far to the back of the car as possible to minimize pressure drag (the Bernoulli relationship). A design with less drag means higher efficiency and an increased maximum
velocity Velocity is the directional speed of an object in motion as an indication of its rate of change in position as observed from a particular frame of reference and as measured by a particular standard of time (e.g. northbound). Velocity i ...
, given the same
powertrain A drivetrain (also frequently spelled as drive train or sometimes drive-train) is the group of components that deliver mechanical power from the prime mover to the driven components. In automotive engineering, the drivetrain is the components o ...
.


Career

German Professor, Wunibald Kamm worked with aerodynamics engineer Baron Reinhard von Koenig-Fachsenfeld. They developed a design with a smooth roofline and a taper in the automobile's body that is suddenly chopped off at the rear end. This design makes the air flow act as if a full tapered "tail" was present on the vehicle. A full size
prototype A prototype is an early sample, model, or release of a product built to test a concept or process. It is a term used in a variety of contexts, including semantics, design, electronics, and software programming. A prototype is generally used to ...
was developed in 1938. It was a four-door sedan featuring a sharply truncated rear end. The test car represented a compromise between a low air resistance and practicality in the automobile's size and shape. In the 1920s, Kamm worked for Daimler designing engineering race car engines. Thereafter, a prototype, namely the Kamm “SHW Wagen” incorporated principles that have become standard parts of the car engineering toolbox. He paid particular attention to the
suspension Suspension or suspended may refer to: Science and engineering * Suspension (topology), in mathematics * Suspension (dynamical systems), in mathematics * Suspension of a ring, in mathematics * Suspension (chemistry), small solid particles suspende ...
and minimizing vehicle weight. These improvements included extreme low weight design, an
aluminum Aluminium (aluminum in American and Canadian English) is a chemical element with the symbol Al and atomic number 13. Aluminium has a density lower than those of other common metals, at approximately one third that of steel. It ha ...
semi-
monocoque Monocoque ( ), also called structural skin, is a structural system in which loads are supported by an object's external skin, in a manner similar to an egg shell. The word ''monocoque'' is a French term for "single shell". First used for boats, ...
body,
front wheel drive Front-wheel drive (FWD) is a form of engine and transmission layout used in motor vehicles, where the engine drives the front wheels only. Most modern front-wheel drive vehicles feature a transverse engine, rather than the conventional longitu ...
, boxer-style engines (horizontally opposed cylinders), independent suspension on all wheels, and
coil spring A selection of conical coil springs The most common type of spring is the coil spring, which is made out of a long piece of metal that is wound around itself. Coil springs were in use in Roman times, evidence of this can be found in bronze Fib ...
s mated to hydraulic
shock absorber A shock absorber or damper is a mechanical or hydraulic device designed to absorb and damp shock impulses. It does this by converting the kinetic energy of the shock into another form of energy (typically heat) which is then dissipated. Most ...
s. His comprehensive approach to automotive engineering and design presaged the concept of "
Mechatronics Mechatronics engineering also called mechatronics, is an interdisciplinary branch of engineering that focuses on the integration of mechanical, electrical and electronic engineering systems, and also includes a combination of robotics, electronics, ...
," a word that did not come into existence until 1971. Established in 1930, the Research Institute of Automotive Engineering and Vehicle Engines located near
Stuttgart Stuttgart (; Swabian: ; ) is the capital and largest city of the German state of Baden-Württemberg. It is located on the Neckar river in a fertile valley known as the ''Stuttgarter Kessel'' (Stuttgart Cauldron) and lies an hour from the Sw ...
(german: Forschungsinstitut für Kraftfahrwesen und Fahrzeugmotoren Stuttgart - FKFS) was called the "Kamm-Institut" after its founder and long-time director. Kamm was inducted into the
Automotive Hall of Fame The Automotive Hall of Fame is an American museum. It was founded in 1939 and has over 800 worldwide honorees. It is part of the MotorCities National Heritage Area. the Automotive Hall of Fame includes persons who have contributed greatly to a ...
. He did pioneering work 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 ...
, driving dynamics, tire technology, minimalist construction techniques, engine combustion efficiency.
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 ...
s were an effectively applied technology, and he "built the first full-scale wind tunnel for motor vehicles." "Dr. Kamm, even today, and perhaps even more so because of his foresight, is considered one of the greatest researchers in automotive engineering." His work on turbulence is considered to have been "breakthrough" and fundamental. He came to the U.S. as one of the first hundred German scientists stationed at the
Dayton, Ohio Dayton () is the List of cities in Ohio, sixth-largest city in the U.S. state of Ohio and the county seat of Montgomery County, Ohio, Montgomery County. A small part of the city extends into Greene County, Ohio, Greene County. The 2020 United S ...
Wright-Patterson Air Force Base Wright-Patterson Air Force Base (WPAFB) is a United States Air Force base and census-designated place just east of Dayton, Ohio, in Greene and Montgomery counties. It includes both Wright and Patterson Fields, which were originally Wilbur Wr ...
and remained there as a consulting engineer until 1953. That year, he went as a professor to the
Stevens Institute of Technology Stevens Institute of Technology is a private research university in Hoboken, New Jersey. Founded in 1870, it is one of the oldest technological universities in the United States and was the first college in America solely dedicated to mechanical ...
in
Hoboken, New Jersey Hoboken ( ; Unami: ') is a city in Hudson County in the U.S. state of New Jersey. As of the 2020 U.S. census, the city's population was 60,417. The Census Bureau's Population Estimates Program calculated that the city's population was 58,690 ...
. For three years beginning in 1955 he was head of
Mechanical Engineering Mechanical engineering is the study of physical machines that may involve force and movement. It is an engineering branch that combines engineering physics and mathematics principles with materials science, to design, analyze, manufacture, ...
at the
Battelle Memorial Institute Battelle Memorial Institute (more widely known as simply Battelle) is a private nonprofit applied science and technology development company headquartered in Columbus, Ohio. Battelle is a charitable trust organized as a nonprofit corporation und ...
in Frankfurt, Germany.


Awards and honors

* In 1958, he received the German Service Cross, First Class. * The University of Braunschweig conferred an honorary Ph.D. in recognition of technical lifetime achievements. * Asteroid 22499 Wunibaldkamm was named in his memory. The official naming citation was published by the
Minor Planet Center The Minor Planet Center (MPC) is the official body for observing and reporting on minor planets under the auspices of the International Astronomical Union (IAU). Founded in 1947, it operates at the Smithsonian Astrophysical Observatory. Function T ...
on 25 September 2018 ().


The first "Kamm coupe"

In late summer of 1938, BMW tested a prototype of the so-called "Kamm-Coupe" based on their 328 chassis. It had a
drag coefficient In fluid dynamics, the drag coefficient (commonly denoted as: c_\mathrm, c_x or c_) is a dimensionless quantity that is used to quantify the drag or resistance of an object in a fluid environment, such as air or water. It is used in the drag e ...
of only 0.25 compared to the great 1940
Mille Miglia The Mille Miglia (, ''Thousand Miles'') was an open-road, motorsport endurance race established in 1927 by the young Counts Francesco Mazzotti and Aymo Maggi, which took place in Italy twenty-four times from 1927 to 1957 (thirteen before World ...
winning
BMW 328 The BMW 328 was a sports car offered by BMW from 1936 to 1940, with the body design credited to Peter Szymanowski, who became BMW chief of design after World War II (although technically the car was designed by Fritz Fiedler). Specifications ...
Touring Coupe with drag coefficient 0.35. This automaker's naming of its
coupé A coupe or coupé (, ) is a passenger car with a sloping or truncated rear roofline and two doors. The term ''coupé'' was first applied to horse-drawn carriages for two passengers without rear-facing seats. It comes from the French past parti ...
model appears to be the earliest use of "Kamm" to publicly describe an automobile body incorporating the Koenig-Fachsenfeld's design patent.


Kammback named production cars (USA)

*
AMC Gremlin The AMC Gremlin (also American Motors Gremlin) is a subcompact automobile introduced in 1970, manufactured and marketed in a single, two-door body style (1970–1978) by American Motors Corporation (AMC), as well as in Mexico (1974–1983) by A ...
and
AMC Eagle AMC may refer to: Film and television * AMC Theatres, an American movie theater chain * AMC Networks, an American entertainment company ** AMC (TV channel) ** AMC+, streaming service ** AMC Networks International, an entertainment company *** ...
Kammback — The truncated hatchback design increased interior space capacity, not for streamlining. *
Chevrolet Vega The Chevrolet Vega is a subcompact automobile that was manufactured and marketed by GM's Chevrolet subdivision from 1970 to 1977. Available in two-door hatchback, notchback, wagon, and sedan delivery body styles, all models were powered by an ...
Kammback — The
station wagon A station wagon ( US, also wagon) or estate car ( UK, also estate), is an automotive body-style variant of a sedan/saloon with its roof extended rearward over a shared passenger/cargo volume with access at the back via a third or fifth door ( ...
design has more taper than the Gremlin, but not enough to gain aero-effects. * Hyundai Veloster Turbo – Asymmetrical 3-door coupe-hatchback featuring a dropped tapered rear wing, to a dropped rear facia. The Kammback "cut off tail" design continues to be popular. It often insinuates streamlining when used in production cars and is a design technique to make the vehicle look "sporty". Kamm's design approach is found on popular mass-market vehicles,
supercar A supercar – also called exotic car – is a loosely defined description of street-legal, high-performance sports cars. Since the 2010s, the term hypercar has come into use for the highest performing supercars. Supercars commonly serve as t ...
s,
alternative fuel vehicle An alternative fuel vehicle is a motor vehicle that runs on alternative fuel rather than traditional petroleum fuels (petrol or petrodiesel). The term also refers to any technology (e.g. electric car, hybrid electric vehicles, solar-powered ve ...
s, as well as for
race cars Auto racing (also known as car racing, motor racing, or automobile racing) is a motorsport involving the racing of automobiles for competition. Auto racing has existed since the invention of the automobile. Races of various sorts were organise ...
.


References


External links

* - an explicitly Kamm-influenced design which informed the
Citroën CX The Citroën CX is a large, front-engined, front-wheel-drive executive car manufactured and marketed by Citroën from 1974 to 1991. Production models took the form of a four-door fastback sedan, station wagon (estate), and a long-wheelbase fastb ...
and
Rover SD1 The Rover SD1 is both the code name and eventual production name given to a series of executive cars built by the Specialist Division (later the ''Jaguar-Rover-Triumph'' division) of British Leyland (BL), under the Rover marque. It was produ ...
* archived from the original at
Wayback Machine The Wayback Machine is a digital archive of the World Wide Web founded by the Internet Archive, a nonprofit based in San Francisco, California. Created in 1996 and launched to the public in 2001, it allows the user to go "back in time" and see ...
Internet Archive The Internet Archive is an American digital library with the stated mission of "universal access to all knowledge". It provides free public access to collections of digitized materials, including websites, software applications/games, music, ...
* - People who influenced the BMW's car design {{DEFAULTSORT:Kamm, Wunibald German automobile designers German automotive engineers 1893 births 1966 deaths People from Basel-Stadt German expatriates in the United States Swiss emigrants to Germany