Thread: Decimal places
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Old 04-30-2021, 12:41 PM   #41 (permalink)
aerohead
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Tesla Model S

Quote:
Originally Posted by AeroMcAeroFace View Post
I can't find your third thread, but for everyone else, selected numbers are.

Total intake block cD change = -0.020

Baseline with 19" wheels = 0.249
19" aero wheels = 0.223
21" style wheels = 0.257

Depending on options specified, such as wheels, it is impossible to say 8% is the same for every option. But this test was done on the baseline model with 19" wheels and that, with all intakes blocked, reduced drag by 8%.

Would the same 0.02 change be found with the other wheels? Who knows? would the same 0.02 change be found on the myriad of numbers listed by aerohead, again we don't know.



Unfortunately true, I think it is a superiority issue, and good points/arguments get drowned out by the never ending gish gallop of aerohead.



Reading the referenced paper generally helps here.
In Julian's book he credits 'Tesla' with a Cd 0.26 attribution for the Model S.
'Tesla' also refers to a ' multi-stage active management of the cooling...', so, borrowing from Vman55, ' in what universe would you see a fixed cooling system drag coefficient, or percentage. '
Wouldn't it rather be, from zero to- 8%?
The Model S road load power requirement varies 460% between 85-mph and its top speed. In what universe would the cooling system drag be a 'constant'?
And then there's the issue of different drag coefficients.
Come on guys. Put your tin-foil caps on and see if you can do better.

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