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You know, I'm surprised that these boxes are effective. I'd have thought that the point was for them to be aerodynamically neutral - otherwise, why shorten the wing at all?
Given the assumption that they don't produce d/f (ie don't generate low pressure under the box), wouldn't that reduce the effectiveness of the endplate extension? I thought the extension's purpose was to contain the low pressure immediately under the wing, but to my mind there would still be bleedoff between the low-pressure wing end and the box zone.
:confused:
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