quarter-chord

quarter-chord

quarter-chord
The locus of all points on an airfoil or wing lying at a 25% chord. These measurements are made in the plane parallel roots along the longitudinal axis of an aircraft. Normally, the reference wing is in a clean configuration, but it includes sawtooth and other basic modifications to the outline of the chord. The quarter-chord is the reference for many aerodynamic calculations.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
[[GAMMA].sub.Fi] is the total vortex strength at quarter-chord line of the ith panel element and [[GAMMA].sub.Fi] = [1.sub.i] [[GAMMA]'.sub.Fi] [V.sub.[infinity]], in which [1.sub.i] is the vector that describes the magnitude and direction of the ith panel element's 1/4 chord line.
The doublet line stands along the quarter-chord line of the panel.