In the early 1800s, George Cayley devised the whirling arm as a way to measure the drag and lift of airfoils.

U.S. Centennial of Flight Commission home page

In the early 1800s, George Cayley devised the whirling arm as a way to measure the drag and lift of airfoils.

In the early 1800s, George Cayley devised the whirling arm as a way to measure the drag and lift of airfoils. .

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