The Kamm tail presented a partial solution to the problem of aerodynamic lift, which was becoming severe as sports car racing speeds increased during the 1950s. The design paradigm of sloping the tail to reduce drag was carried to an extreme on cars such as the Cunningham C-5R, resulting in an airfoil effect lifting the rear of the car at speed, which could result in instability or loss of control. The Kamm tail decreased the area of the lifting surface while creating a low-pressure zone underneath the tail.