[aerohead]

The expression was coined by Fredrick Lanchester, in his 1907 book on aerodynamics, which I shared here at the Forum a number of years ago.
1) The 'roofline' of a road vehicle, in 'ground reflection, is the most important element as far as 'aerodynamics' goes.
2) The contour of the 356 Coupe is already extremely compromised ( mutilated ).
3) The contour of the Speedster takes the injury to an extreme level, both roofline and rear deck area ( it's completely different from the Coupe ), a double-whammy.
4) When the roof of the Speedster is lowered, and side curtains absent, you're looking at something in the neighborhood of Cd 0.5184, the trifecta of aero abuse.
5) The 'buttocks' and 'tail' of the car are essentially 'gone.'
6) Dr. Komenda's wind tunnel schematic images depict complete flow separation at the top of the wind screen, with no reattachment, anywhere on the upper body; violating Hucho's ground rules for fluid mechanics.