Hello,

I have been reading about the P-factor ( unequal lift caused by ascending and descending propellers) and the explanations given don't seem complete or adequate.
The angle of attack is usually defined as the angle between the chord of the wing and the relative wind direction. We are told that the descending arm of the propeller has a greater angle of attack than the ascending arm thus creating greater lift and a corresponding torque of the airplane toward the left.

How is the chord of the propeller defined ? If we assume an airplane moving horizontally with a pitch up attitude, what is the resultant relative wind direction on the propeller ? Can someone shed some light on this phenomenon ?