Discussion
Match each trim change in List I with its cause in List II.
List I
A. Nose up with power applied
B. Nose down in the flare
C. Nose down at high Mach
D. Pitch change on flap selection
List II
1. Thrust line below the centre of gravity
2. Reduced downwash in ground effect
3. Rearward shift of the aerodynamic centre
4. Altered lift distribution and downwash
Select the correct match.
Answer: C
Correct answer: A-1, B-2, C-3, D-4
Each trim change has its own mechanism. Power on underslung engines acts through the thrust line below the centre of gravity, producing a couple. Ground effect in the flare acts through reduced downwash at the tailplane.
Mach tuck acts through the rearward shift of the aerodynamic centre. Flap selection acts through the altered lift distribution and the downwash change that follows. Two of the four work at the tail and two on the wing or the thrust line - a useful first division.
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