Darrol Stinton's statement on wing AR(aspect ratio) for minimum induced drag

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Lendo

Well-Known Member
Joined
Feb 6, 2013
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504
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Brisbane
I agree, stick to 6 to 9 for best AR I prefer 6 to 7 or at most 8, but different aircraft, different missions.
Given the Spar Root needs to be the biggest section of the Spar and that thickness results on Chord length, AR is all a balance between competing considerations.

Interesting discussions though, I don't believe anyone mentioned the Induced drag vortex as they build -up along the Wing Trailing edge and combines with the tip Vortex. One can then see it IS in fact the cost of Lift.

I would love to know, where the trade off/ balance is between Smaller Tip Vortex and Longer span vortex build-up, for any given design.
George
 
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