It was once thought that a long tapered end in the shape of a vehicle would give it the most aerodynamic configuration. W. Kamm discovered that the length of the end would have to be so long as to make the vehicle impractical. There would also be an increase in surface area which would also create its own friction drag . He found that if he cut the theoretically long tail in half he would have both good aerodynamics and minimal surface drag . This sharply cut off rear end is named after him.
KAMM BACK
Meaning of KAMM BACK in English
English dictionary of automotive terms. Английский словарь автомобильных терминов. 2012