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Old 09-04-2012, 06:47 AM   #4 (permalink)
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This is always a choice between practicality and drag -- if you cannot do without all the space in your existing cap, then adding an arched top will probably help the overall drag, even if it adds frontal area (as Chaz says). But, if you can live with a smaller volume under the cap, then truncating the existing cap will definitely be better.
Sincerely, Neil
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