lag angle

lag angle

[′lag ‚aŋ·gəl] (physics) The negative of phase difference between a sinusoidally varying quantity and a reference quantity which varies sinusoidally at the same frequency, when this phase difference is negative. Also known as angle of lag; lag.

lag angle

The angle by which a rotor blade is displaced about its drag hinge. The angle is measured between the blade-span axis and a radial line taken across the rotor disc containing the drag hinge and the axis of rotation.