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Old 10-28-2017, 02:35 PM   #106 (permalink)
freebeard
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Thanks.

I suspect the increased drag is caused by the duck-tail contour of the upper wing. But it is positioned for maximum leverage.

Suppose the upper wing had the same contour as the XR4Ti part. It would be very similar to kach22i's pickup cab wing with a bigger gap.
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