The higher the density of the air, the more lift that is produced by the wing. The higher the altitude, the less dense the air. As a very general rule, if we halve the air density we halve the amount of lift the wing can produce. The higher an aircraft flies, the less dense the air is and therefore the less lift the wing can produce. Air density Angle of attack is the angle between the wing chord and the relative airflow. As we increase the angle of the attack of the wing, the lift will also increase until it reaches its maximum at the critical angle of attack. Drag created by lift is called ‘induced drag’. As the angle of attack of the wing increases so does the induced drag. Angle of attack The larger the surface area of the wing, the more lift that can be produced. As a general rule, if we double the size of the wing, we double the amount of lift available. The same can be said for drag, as the surface area of the wing increases so does the drag; so as a general rule if we double the size of the wing, we double the drag. Surface area of the wing The angle of incidence is the angle between the Chord line and a reference axis that runs along the fuselage. The angle of incidence cannot be changed on an aircraft and has no effect on the production of lift. Angle of incidence Lift and Drag Ch.2 - How an aircraft generates lift
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