Discussion
Statement I: A better high-lift system relaxes both the takeoff and landing constraints.
Statement II: Both constraints depend on the maximum lift coefficient achievable in their respective configurations.
In the light of the above statements, choose the correct answer.
Answer: B
Correct answer: Both Statement I and Statement II are correct
Both statements are correct and the second explains the first. Takeoff distance depends on the lift-off speed, set by the takeoff-configuration \( C_{L,max} \), and landing distance on the approach speed, set by the landing-configuration \( C_{L,max} \).
A better high-lift system raises both, so the takeoff constraint moves down and to the right while the landing constraint moves right. The feasible region grows in both directions, buying either smaller engines or a smaller wing - which is why flap and slat design receives attention out of proportion to the fraction of the flight in which it is used.
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