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Curvature... There is - and it's a ratio of curvature/width (or something like that).... Alas, I don't have it available at the moment but it's in Hucho's book on road vehicle aerodynamics. Having more curvature beyond this critical ratio has diminishing returns.
The question of more FA versus not covering handlebars is an exercise in optimization. You want to minimize FA, but protrusions (handlebars) are never a good thing...
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Cars have not created a new problem. They merely made more urgent the necessity to solve existing ones.
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