Discussion
Assertion (A): Swept wings tend to stall at the tip before the root.
Reason (R): Sweep drives boundary-layer fluid outboard along the span.
Select the correct answer from the options below.
Answer: C
Both statements are true and the second is the reason for the first. The thickened, low-energy layer that collects near the tip separates early, costing maximum lift and, worse, aileron authority. Fences, vortilons, washout and leading-edge devices all exist to fight this tendency.
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