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ใช้คู่กันครับป้อ จะลองแบบ Kamm Theory ดูนะครับ
http://en.wikipedia.org/wiki/KammbackHistoryFreiherr Reinhard Koenig-Fachsenfeld "developed a body style whose tail was cut off to form a flat rear surface"[1] while working on an aerodynamic design for a bus, and he patented the idea.[2]
The innovative tail treatment also minimized turbulence created by Paul Jaray's[3] aerodynamic designs on certain 1935 passenger cars. In 1936, "further research by the FKFS--Forschungsinstitut fur Kraftfahrwesen und Fahrzeugmotoren Stuttgart (Stuttgart Research Institute for Automotive and Automobile Engine Technology), under the direction of Wunibald Kamm, proved that vehicles with the so-called K- or Kamm tail, following Koenig-Faschsenfeld’s lead, offered a good compromise between everyday utility (e.g. vehicle length and interior dimensions) and an attractive drag coefficient."[1]
The earliest use of "Kamm" to describe an automobile body incorporating this design was the prototype 1940 'Kamm' Coupe based on a BMW 328 chassis. [4]
AerodynamicsWhile the realities of fluid dynamics dictate that a teardrop shape is the ideal aerodynamic form, Kamm found that by cutting off / flattening the streamlined end of the tear at an intermediate point, and bringing that edge down towards the ground, he could gain most of the benefit of the teardrop shape without incurring such a large material, structural, and size problem. The airflow, once given the suggestion of the beginning of a turbulence-eliminating streamlined teardrop tail, tended to flow in an approximation of that manner regardless of the fact that the entire tail wasn't there. This is called the Kamm effect.
There is controversy about the proportions of a true Kamm tail. According to the classic definition the tail should be cut off where it has tapered to approximately 50% of the car’s maximum cross section, which Kamm found represented a good compromise - by that point the turbulence typical of flat-back vehicles had been mostly eliminated at typical speeds. Thus a minivan is not a Kammback, and neither are numerous cars that have truncated tails.
Automakers’ use of the term “Kammback” has diminished as Kamm's principles have become more generally assimilated into modern car design.
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