no-lift angle

no-lift angle

The angle between the chord of an airfoil and the relative wind that caused the airfoil to produce no lift. The no-lift direction is the direction of airflow relative to an airfoil section or wing for which lift would be zero on that section of an untwisted airfoil.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved