... surfaces enclosing the load bearing structure. The aerofoil diagrams are in figure 2 and 3. Lift When the aircraft is cruising in straight and level flight, at low altitudes, the wings are set at a small angle, 2 to 5 degrees, to the line of flight. The sum of dynamic pressure of the airflow over the wings and the function loads produce an aerodynamic force with the resultant vector quantity being directed upwards and backwards. Aerodynamicists have found it convenient to divide that resultant into two components that part acting backward along the flight path is the wing drag and that acting perpendicular to the flight path is the lift. The amount of lift, and drag, generated by the wings is dependent on: (a) the angle at which the wings meet the airflow or flight path, (b) the shape of the wings particularly in cross section - the aerofoil, (c) ...

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