P factor

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P factor

P factorclick for a larger image
As the tail of aircraft is down, the axis of rotation is inclined. The down-going blade produces greater thrust as it is at higher angle of attack than the up-going blade. This causes asymmetric loading and aircraft making the aircraft tending to yaw.
One of the “left-turning tendencies” of aircraft with a propeller, in which the loading of a propeller disc produces more thrust on one side than the other. If the nose of the aircraft points up relative to the oncoming wind, the downward-moving blade creates greater thrust than the upward-going blade, as the former is at a higher angle of attack than the latter. Assuming that the engine is turning clock-wise as viewed from the rear (as is the case in the majority of single-engine propeller aircraft), the aircraft will tend to turn left. Also known as asymmetric propeller loading.
References in periodicals archive ?
It's stylish, modern lines ensures it has stacks of the P-factor.
It pulled and rolled to the left because of the huge p-factor generated by the power addition.
In this context, however, since the P-factor is fundamental--pervasive in defining a social order--we need to recognize the parsimony and the power of the master variables.
This P-factor, selected for any given route with its recorded traffic, together with the number of circuits and the chosen traffic-dimensioning formula, will determine the grade of service over that particular route.