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I've been trying to get my head around wing design and have been following a few YouTube videos. When people talk about aspect ratio (AR) on a wing and give a value (Piper PA28 having an AR of 5.7) what is the 5.7? Is it wingspan length? Square metre of coverage? Or something else? I'm confused.

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marked as duplicate by fooot, kepler22b, SMS von der Tann, Jay Carr, Ralph J Apr 26 '16 at 20:27

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The Aspect Ratio ($AR$) is defined as the ratio (hence the name) between the wingspan squared $b^2$ and the area of the wing $S$.

Since both $b^2$ and $S$ are measured with a length squared (e.g., $m^2$), $AR$ is an dimensionless quantity.

To answer the follow-on question of TomMcW in the comments, $b$ is the distance between the wingtips, no matter the shape of the wing.

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    $\begingroup$ How is wingspan figured on a swept wing? Is it perpendicular distance between wingtip and fuselage or length of leading edge? $\endgroup$ – TomMcW Apr 26 '16 at 17:15

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