Dihedral

[Ministry_Cork]

All,
A question that has come up in preperation for the ppl exams:

Wing Dihedral
A: Increases from Root to Tip
B: Decreases from Root to Tip
C: Gives Lateral Stability
D: Gives Directional Stability

My understanding is that dihedral gives lateral stability and therfor C should be correct however the correct answer has been given as A. I cannot find any reference to wing dihedral increasing from root to tip as i would assume (probably incorrectly) that the wing angle remains almost contstant from root to tip with referene to the horizontal on light aircraft? Looking at the A380 however it looks like dihedral decreases from root to tip?

Does anyone have a clear definition of Dihedral with specific reference to the anlges?


Thanks in advanace.
M