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Rolling stability
If an aircraft rolls slightly from its level-wing position, then the lift force will have a sideways component (as shown in Fig. 10.11). This results in a sideslip, and we can use the sideslip to produce a restoring roll moment by a number of means. The traditional method is to crank the wings upwards to give lateral dihedral, as shown in Fig. 11.14. Figure 11.15 shows an aircraft with wing dihedral viewed from the direction of the approaching air. As the aircraft is sideslipping, the air approaches from the front quarter. From this view, we can see that the near wing presents a greater angle of attack than the far wing. The near wing will, therefore, generate more lift, rolling the aircraft back towards the horizontal.
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Fig. 11.16 Stability of a high-wing aircraft Before the sideslip develops, the lift force line of action passes through the centre of gravity, and there is no restoring moment Once the sideslip develops, the lower wing generates more lift than the other. The lift force no longer passes through the centre of gravity, and a restoring moment is produced. If the resultant sideforce line of action passes above the centre of gravity this will also contribute to the restoring moment (a) Before onset of sideslip (b) During sideslip |
