Quote:
Originally Posted by RedDevil
Notice how the back window goes slightly steeper than the template, bending the airflow down at the risk of inducing instability... but it all lands on the horizontal spoiler to have a high pressure area at the lower part of the glass, reducing drag.
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I think you need to reconsider whether a very slight variation from the template is "Risking Instability". It is really a matter of being 98% perfect or 100% perfect in slight variations such as this. It isn't as if "The shape isn't 100% right, therefore it is going to only yield a 50% gain because the airflow is spoiled."
The air will barely notice this compared to if the shape followed the template perfectly, you'd need instruments tuned to very high level of sensitivity in order to detect a difference. And with all the subtle nuances with aerodynamics, that slight shift may even be a teeny tiny improvement.
My hunch is that they sloped the window a bit steeper to get the rear window a bit more vertical in order to function better for rear visibility. Possibly. Maybe.