By Dana Bell

Air strength colours Vol 1: 1926-42

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Characteristic curves for CL, C D and for the ratio L/D depend the shape (not size) of the wing profile, and to a certain degree also The , on on the span /chord ratio (aspect ratio, AR). It would be necessary therefore, to test various wing profile models not only at various angles of attack but also for various aspect ratios. That is, after deciding on would have to determine C L and CD with models a certain profile, one whose aspect ratio ranged from 3 to 8, each of them for many different angles a.

Vortex Lines two sections we found that vorticity superimposed on at right angles to the incident wind in two-dimensional flow, without giving rise to a force of drag parallel to the wind. To explain and compute the drag 011 a wing in flight we must discuss In the last wind produces lift the three-dimensional flow pattern near the wing tips and the peculiar vortices emerging from the tips and trailing behind the wing (PrandtVs wing theory}. we had to do with circulation about an infinite straight axis directed parallel to the infinite span.

12, and for dive in Fig. 13. assumed that the airplane travels to the left so that the relative wind points to the right. Under equal conditions (a) (b) (c) and at equal wind speeds and air densities, the force diagrams of Figs. 12 and 13 are obtained by tilting Fig. 11 up or down through a certain However, since the force of gravity (weight) always points downward, the vector composition of wind force, thrust, and gravity yields three different force diagrams (compare with Fig. 14). angle. THE PHYSICS OF FLIGHT 34 The angle between the total wind force, F, and its lift component, L, may be denoted by the letter 5.