Quote:
Originally Posted by freebeard
Why? What impels the air to flow outward through the gap?
I presume the profile is similar to the 'wake boards' in that illustration (I don't stand behind any of that. I'd like to see 'passive porosity' explained for instance). The wake boards appear to be the start of a boxed cavity. They could be angled or inset [citation needed].
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Me too on "passive porosity".
Seems to me, the first three representations illustrated mainly fall into the category, "Can't hurt", (much?
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Anything less then a proper angled bobtail, needs to Kamn it, or go box cavity.
I don't see any magic silver bullets here.