Quote:
Originally Posted by JulianEdgar
Your point seems to apply to any lengthened / contracting body, not one specifically with a cavity. I don't think that a box cavity works as you appear to assume it to.
I doubt that holes in the cavity extensions will make much difference, either way. But I am just guessing.
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* ' the drag reduction from an elongated tail varies almost linearly with the reduction in cross section area.' SAE 2020-01-0673
* Any porosity would only compromise the effect. Voids cannot sustain pressure.