My hat does not require eating, although I'm surprised that its so heavy, I was hoping for around 2950-3000 wet. Also looks like my spreadsheet for horsepower was pretty good, it predicted 650 hp to hit 216mph. This actually implies that it's perhaps not as slippy as it looks, would love to know the Cd
Yeah, I was thinking the same thing, although I don't have your spreadsheet. With almost 100 more HP, I would have expected it to be significantly faster at top speed than ours--well into the 220 MPH range. That strongly indicates the the aero was designed to take maximize other factors than just Cd. Since it was designed as a race car, I'm sure downforce was an important consideration, which drives up induced drag, so I'm guessing that was the main tradeoff.
As for weight: Again, it was designed as a race car, so the design probably incorporated safety features (integral roll cage?, etc) and other features that would not ordinarily be included in a street car.
As for 647 HP, If past Ford performance specs are a guide, that's the minimum HP they guarantee, actual may be a bit higher. For those in the tuning business, I'll bet there's plenty more to be had by changing the boost limits and running higher octane gas.