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An angle of attack of an aerofoil that produces no lift. (Coefficient of lift, C_L is zero.) For asymmetric aerofoils, this angle is negative for the C_L to be zero. (See diagram at right.) For symmetric aerofoils the zero lift axis is aligned with the chord line of the wing.

When flying vertical lines in Aerobatics the object is to fly the aircraft perpendicular to the ground. If the wing produces any lift (positive or negative) then the aeroplane will pitch onto its back or underside.

[edit] See also

• Angle of attack
• Aerobatics
• Aerobatic maneuver