Discussion
Which is TRUE of the relationship between section data and finite wing data?
Answer: D
Correct answer: The wing has a smaller lift curve slope than the section
The downwash induced by the trailing vortex system reduces the effective angle of attack at every section of a finite wing, so more geometric incidence is needed for a given lift coefficient and the slope is lower. The reduction grows as aspect ratio falls, which is why a slender high aspect ratio wing behaves much more like its section than a stubby one does.
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