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I don't think those miniscule winglets of the Airbus make an appreciable difference.!
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So what's the point of fitting them, as one assumes they're not there for decoration ?
I understand the theory of winglets (eg. 744, 738, A330) which tend to confer a fuel benefit over cost for sectors of 3 or more hours, but what of the Airbus-style wingtip fences (which I believe is their proper name) ?