Quote:
Originally Posted by freebeard
So that would be a planning parameter rather than a r*le of th*mb.
Sixteen inches, more or less? Seems like a good candidate for perforating. Did you save the pieces?
Lots of experimental possibilities with slot/hole size and location.
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I'm looking at Figure 8.67, on page-333, of Hucho's 2nd-edition. It's the constant-section box-cavity behind the Volkswagen Transporter.
I'm not sure if this is what's being discussed.
If so, then Hucho is using the total length ( l ) of the vehicle in relation to the depth ( x ) of the extension.
Only two data points are given.
At x / l = 0.22, the drag reduction is Cd 0.06.
Cd 0.43 - 0.06 = Cd 0.37 ( bingo! )
