Engineering Schemes

Wing planform geometry

The planform of a wing, for a given gross area, is defined by the geometric parameters, aspect ratio, taper ratio and sweepback. These are shown in Fig. 8.2(a). Many wing planforms incorporate a cranked trailing edge (see Fig. 8.2(b)). This improves the efficiency of the flap and moves the centre of lift of the wing closer to the centre of the aircraft creating a lighter wing structure. For initial design studies it is sometimes necessary to avoid such complications in the planform geometry and to approximate the total area to an equivalent straight tapered shape as shown in Fig. 8.2(b). The choice of the wing thickness and planform parameters is discussed in Chapter 6.

Fig. 8.2(b) Wing planform geometry (cranked trailing edge).

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