> This is an interesting web site, it doesn't list the Berlina or GTV
but it list the '71 Spider at .380cd and a '90 Spider at .410cd -I
guess that big rubber spoiler was just there for "looks"!
Or--perhaps to trade off a bit of drag against less uplift at
speed--which is generally what spoilers are intended to do.
With that reduction in lift comes a reduction in induced drag. A car
with an effective spoiler will have a lower drag coefficient than the
same car without the spoiler. If an aerodynamic device creates
downforce at the expense of additional induced drag then it's a wing,
not a spoiler.
-Joe
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