Discussion
Match each condition in List I with why it is demanding in List II.
List I
A. Flare at forward centre of gravity
B. High incidence on a T-tail
C. High Mach cruise
D. Power application on a propeller aeroplane
List II
1. Largest nose up moment when the surface is least effective
2. Tailplane may enter the wing wake and lose effectiveness
3. Nose down moment from the rearward aerodynamic centre shift
4. Thrust line and slipstream both change the trim
Select the correct match.
Answer: A
Correct answer: A-1, B-2, C-3, D-4
Each condition is demanding for its own reason. The flare at forward centre of gravity combines the largest nose-up demand with the least authority. High incidence on a T-tail risks the tailplane entering the wing wake.
High Mach cruise brings the nose-down moment from the rearward aerodynamic centre shift. Power application on a propeller aeroplane changes trim through both the thrust line and the slipstream. Note that the first two are control-authority problems and the last two are trim-change problems.
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