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The depth of an unventilated box cavity for lowest drag was 0.37 * D, where D was 'effective body diameter'.
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So that would be a planning parameter rather than a r*le of th*mb.
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I don't know what the above depth was, but nowhere near the 560mm I calculate from the above equation (400mm with vents).
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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.