P FactorWiki info
When an aircraft is in straight and level flight at cruise speed, the propeller disc is perpendicular to the relative wind. Each of the propeller ... Read more blades will contact the air at the same angle and speed and thus the thrust produced is evenly centered across the propeller. As the aircraft's angle of attack increases and the propeller disc rotates toward the horizontal, the airflow will meet the propeller disc at an increasing angle. The propeller blades moving down and forward (for clockwise rotation, from the one o'clock to the six o'clock position when viewed from the front) will have a greater relative wind velocity and therefore will produce greater thrust, while propeller blades moving up and back (from the seven o'clock thru 12 o'clock position) will have a decreased relative wind velocity and therefore decreased thrust. This asymmetry displaces the center of thrust of the propeller disc towards the blade with increased thrust. In an aircraft with two or more propeller engines, P-Factor is what determines which engine is the critical engine.Read less
To download or print just press the button on the right side of every images. You can zoom the image for better view by clicking on the picture. If you like this site dont forget to share to the world, we hope you enjoy your visit.