Quote:
Originally Posted by kach22i
Yes I see that.
However at the 1:50 mark they put in a version of an aeroshell that does not perform very well.
From I can tell the air should remain attached for over half the arc, but does not. Why is that? The space between cab and gap just too disruptive?
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One guess is that, because it's a 'small' model, and would need to be equivalent to at least 20-mph at full-scale to have a chance for attached flow, that it's demonstrating a sub-critical Reynolds number and a laminar boundary layer, just like a golf ball without dimples.
1/4-scale is the minimum a car company will use for wind tunnel testing.
1/24th-scale would require a minimum 420-mph air velocity, and you'd be experiencing supersonic shockwaves.