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Variation of lift with angle of attack and camber
As shown in Fig. 1.17, the lift coefficient is directly proportional to the angle of attack for small angles.
Figure 1.17 also shows the effect of camber on lift coefficient. It will be seen that the influences of angle of attack and camber are largely independent: that is, the increase in lift coefficient due to camber is the same at all angles of attack.
Cambered aerofoils can produce higher maximum lift coefficients than symmetrical ones. Also, as shown in Fig. 1.17, they produce lift at zero angle of attack. The angle at which no lift is generated is therefore negative, and is known as the zero-lift angle.
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Fig. 1.17 Variation of lift coefficient with angle of attack and camber The increase in lift coefficient due to camber is almost independent of the angle of attack |
The shape of the camber or mean line is important as well, as it affects the position of the line of action of the resultant lift force. Later on, we shall describe how variations in camber can be used to control the aerodynamic properties of a wing.
