add. ·- the angle between the tangent to the advancing edge (of an aerocurve) and the line of motion;
contrasted with angle of trail, which is the angle between the tangent to the following edge and the line of motion.
add. ·- the angle between the tangent to the advancing edge (of an aerocurve) and the line of motion;
contrasted with angle of trail, which is the angle between the tangent to the following edge and the line of motion.
Webster English vocab. Английский словарь Webster. 2012