Quote:
Originally Posted by freebeard
Thanks. So, holes to the upstream exterior, through the interior.
The good news is I don't have a '67 Lincoln convertible with the roll-down back window, like Neil Young, anyways. Assuming taped seams all the way back, the box cavity faces that are not facing rearward (the inner sides, top and bottom) don't produce drag, do they?
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Those inner faces are in dead air pretty much so they're, so to speak,inert.The box (if properly configured) creates locked-vortices,all around, of which the outer flow skip over, re-attaching at the rear.Since the rear bulkhead is smaller in cross-sectional area,the wake is smaller and at a higher pressure since the air is decelerated,cutting the pressure drag.