Discussion
Match each term in List I with its definition in List II.
List I
A. Dihedral effect
B. Helix angle
C. Aileron reversal
D. Adverse yaw
List II
1. Rolling moment produced by sideslip
2. Roll rate times semi-span divided by true airspeed
3. Wing twist overcoming the aileron's own lift change
4. Nose yawing away from the intended turn during a roll
Select the correct match.
Answer: A
Correct answer: A-1, B-2, C-3, D-4
Each term has its own definition. The dihedral effect is the rolling moment produced by sideslip; the helix angle is \( pb/2V \), the non-dimensional roll rate; aileron reversal is wing twist overcoming the aileron's own lift change; and adverse yaw is the nose moving away from the intended turn during a roll.
Two of the four are quantities and two are named phenomena, which halves the matching at once. The pairing is then a matter of noting which quantity concerns sideslip and which roll rate.
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