Discussion
Match each arrangement in List I with its description in List II.
List I
A. Conventional elevator
B. Variable incidence tailplane
C. All moving stabilator
D. Elevons
List II
1. A hinged surface on a fixed tailplane
2. The whole tailplane trims while an elevator manoeuvres
3. The whole surface acts as the control
4. Combined pitch and roll surfaces on a tailless aeroplane
Select the correct match.
Answer: B
Correct answer: A-1, B-2, C-3, D-4
The four are distinguished by how much of the surface moves and what it is asked to do. A conventional elevator is a hinged surface on a fixed tailplane. A variable incidence tailplane splits the work: the whole tailplane trims slowly while an elevator handles manoeuvring.
A stabilator has no fixed part at all, the whole surface acting as the control. Elevons combine pitch and roll on a tailless aeroplane, having no tailplane to work from. Reading for how much is fixed settles three of the four at once.
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