P-Factor (Asymmetric Propeller Loading)

A left-turning tendency caused by the descending propeller blade (on the right side in a typical clockwise-rotating propeller as seen from the cockpit) producing more thrust than the ascending blade on the left. This occurs because at high angles of attack, the descending blade meets the air at a greater effective angle of attack than the ascending blade, creating unequal thrust. P-factor is most pronounced at high power settings and high angles of attack, such as during slow flight and climb.