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Note also aero mirrors and stalks on the Aston Martin.
How stout do the stalks need to be?
My old Porsche has fat blunt stalks and "flag" mirror housings about as streamlined as a used brickbat. WW2 Spitfire fighter had outside mirror of about the same frontal area and glass size, yet had an aero housing and narrow stalk that flew at 400+ mph without falling off in the breeze, so I wonder why car designers mostly don't seem to grasp the concept of narrow stalks and low drag.
PS: As regards chin spoiler, somebody figured that ~4" protrusion is about optimum.
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