Discussion
Assertion (A): Slender delta wings continue to produce lift well beyond a conventional stalling angle.
Reason (R): Their sharp swept leading edges shed stable vortices that suck on the upper surface.
Select the correct answer from the options below.
Answer: D
Both are true and the second explains the first. The vortex cores hold strong low pressure over the upper surface, and the increment grows nonlinearly with incidence. The consequence is the very nose-high approach attitude such aircraft adopt rather than a conventional stall.
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