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The data is out there, I believe in the RS book. I can't remember it exactly, but it was approx...
No tail and front spoiler and there is 400 pounds of tail lift above 130. Duck tail negated this down to about 150 pounds of lift. The IROC tail actually produced positive downforce. My real life experience supports this for sure. But, the IROC tail would not be "correct" for the early 911. After my experience with the two tails, it was pretty obvious why they only offered the duck tail for 72 and 73.
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