Quote:
Originally Posted by gasman
As for chopping...
I see that as an example of the false dichotomy logical fallacy, as I cannot find a reason to support that the assumption of mutual exclusivity (between chopping and ducting) is true (among other reasons).
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It's quite simple; you are assuming the duct has no drag. Well, it does. So you are now ADDING, yes ADDING surface area and thus more skin friction to the vehicle while a top chop REDUCES surface area, skin friction, and more than likely, form drag.