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The removable hardtop on the '62 C1 has a lip where the windshield meets the roof that is easily 1.5 inches tall. You can see here how it not only disrupts the airflow as it travels up the windshield, but also causes it to separate from the roof. Then, when it does reattach to the roof midway back, it's very turbulent. This is a major cause of the C1's poorer lift and drag numbers.