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Why do ribs have diagonal struts,why not vertical as seen in airfoil 1airfoils of Citabria airplane?enter image description hereenter image description here

Why do ribs have diagonal struts,why not vertical as seen in airfoil 1?enter image description here

Why do ribs have diagonal struts,why not vertical as seen in airfoils of Citabria airplane?enter image description here

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Why do ribs have diagonal struts,why not vertical as seen in airfoil 21?enter image description here

Why do ribs have diagonal struts,why not vertical as seen in airfoil 2?

Why do ribs have diagonal struts,why not vertical as seen in airfoil 1?enter image description here

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Why wing ribs have diagonal struts

Why do ribs have diagonal struts,why not vertical as seen in airfoil 2?