Discussion
A leading edge slat delays the stall by
Answer: C
Correct answer: Feeding high-energy air over the upper surface through the slot
The slot between the slat and the main element channels air from the high pressure lower surface onto the upper surface, adding momentum to the boundary layer just where it is about to give up against the adverse gradient. The energised layer resists separation to a higher incidence, so the stall is delayed and the maximum lift coefficient rises.
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