Discussion
Consider the following statements about wing ribs:
1. They maintain the aerofoil section.
2. They divide the skin into shorter panels, raising its buckling stress.
3. They carry the spanwise bending moment of the wing.
Which of the statements given above is or are correct?
Answer: A
Correct answer: 1 and 2 only
Statements 1 and 2 are the rib’s real functions: it holds the aerofoil section against the air load and it divides the skin into shorter panels, which raises the stress at which they buckle. Statement 3 belongs to the spars - the spanwise bending moment is carried by the spar caps and the skin working with them, and a rib lies in the chordwise plane where it can contribute nothing to it.
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