Discussion
Match each wing member in List I with what it primarily carries in List II.
List I
A. Spar cap
B. Spar web
C. Rib
D. Closed box skin
List II
1. Vertical shear
2. Direct stress from bending
3. Torsional shear flow
4. Chordwise air load into the spars
Select the correct match.
Answer: C
Reading the wing as a beam makes the division clear: caps are the flanges, webs the shear carriers, skins the closing walls that make torsion cheap, and ribs the chordwise members that feed the air load in and hold everything stable.
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