P factor is caused by the angle of attack of the prop blades relative to the motion of the prop through the air. No P factor when the plane is not moving. Lots of P factor at high power low speed.

Tricycle gear airplanes do indeed experience P factor. Go over a high mountain pass at the service ceiling and you will experience P factor in spades. After a day of mountain flying, I get cramps in my right leg from pushing the rudder pedal.

If the propeller is tilted upward relative to the oncoming air, as the blades travel downward, they have a large angle of attack. As they travel upward on the other side, they have a small angle of attack. They pull hard on the down stroke, and much less on the up stroke. The "swirling" you may observe is the result of a lot more air being pushed though one side of the prop circle compared to the other.

Cocking the thrustline slightly helps reduce the rudder pressure at slow airspeeds.

Bill D.

Perhaps you all know this already, but it didn't seem like everyone had it 100% correct from what I read in some of the previous posts.