Discussion
A relaxed takeoff field length requirement will
Answer: D
Correct answer: Lower the takeoff constraint
Relaxing the field length requirement means the aircraft may use more runway to reach lift-off speed, so less thrust is needed at any given wing loading. The takeoff line therefore moves downward, enlarging the feasible region and allowing a lower - and cheaper - thrust-to-weight ratio.
The landing constraint is unaffected, since it is set by approach speed and braking rather than by the takeoff run. This is a common trade in practice: an aircraft intended only for long runways can be given smaller engines than one that must operate from short fields.
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