Discussion
For that flapped stalling speed of \( 47 \) m/s, the approach speed at \( 1.3 V_s \) is
Answer: C
Correct answer: 61 m/s
The approach speed is the required margin above the stall:
\[ V_{app} = 1.3 \times 47 \approx 61 \text{ m/s} \]The factor of 1.3 is the certification requirement for the reference landing approach speed, giving a margin against gusts, manoeuvre and mishandling. Landing distance scales roughly with the square of this speed, which is why a small reduction in stalling speed is worth so much on the field length.
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