Quote:
Originally Posted by Old Tele man
...Kamm backs don't always work well, due to shedding "edge-effect" vortices, etc.
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Ah, good point. Especially when the roof cuts off early. Side vortices from the remaining downward-sloped corners could interfere with a clean cutoff on top.
Also, the wagon is longer. That gives more time for the air pressure to even out before the end is cut off. (is this called reynolds number?)