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Aerodynamic impact of small, spanwise creases, gaps, channels etc?

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yankeeclipper

Well-Known Member
Joined
Jun 1, 2009
Messages
47
Location
Northeast.
All things retractable, detachable, openable, etc. invariably imply small interruptions in an otherwise (potentially) smooth body. So I'm wondering if there is a rule of thumb, or just common knowledge about how influential spanwise interruptions are, particularly if their width and depth are no bigger than the boundary layer size.
 
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