Discussion
Match each aircraft type in List I with the constraint that typically sizes its engines in List II.
List I
A. Twin-engine transport
B. Air superiority fighter
C. Four-engine long-range transport
D. Short-field regional turboprop
List II
1. Sustained turn at high load factor
2. Second segment climb with one engine out
3. Takeoff field length from a short runway
4. Cruise at altitude
Select the correct match.
Answer: A
Correct answer: A-2, B-1, C-4, D-3
Each type is matched to the constraint that usually sizes its engines. A twin-engine transport (A) is sized by second segment climb with one engine out (2), because half the thrust is lost. An air superiority fighter (B) is sized by the sustained turn at high load factor (1), which demands \( T/W \) approaching unity.
A four-engine long-range transport (C) is sized by cruise at altitude (4), since losing one of four engines is a far smaller penalty. A short-field regional turboprop (D) is sized by takeoff field length from a short runway (3), the requirement that defines its role.
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