WING DIHEDRAL FOR LATERAL STABILITY
The most common method of obtaining lateral stability is by the use of a dihedral angle on the main planes (Figures 4.1 ). Dihedral angle is taken as being the angle between each plane and the horizontal, not the total angle between the two planes, which is really the geometrical meaning of dihedral angle. If the planes are inclined upwards towards the wing tips, the dihedral is positive; if downwards, it is negative and called anhedral (Figure 4.2); but the latter arrangement is only used in practice for reasons other than stability, or even to reduce the amount of lateral stability.
The most common method of obtaining lateral stability is by the use of a dihedral angle on the main planes (Figures 4.1 ). Dihedral angle is taken as being the angle between each plane and the horizontal, not the total angle between the two planes, which is really the geometrical meaning of dihedral angle. If the planes are inclined upwards towards the wing tips, the dihedral is positive; if downwards, it is negative and called anhedral (Figure 4.2); but the latter arrangement is only used in practice for reasons other than stability, or even to reduce the amount of lateral stability.
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