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P-factor is the term for asymmetric propeller loading, causes the airplane to yaw to the left when at high angles of attack. | P-factor is the term for asymmetric propeller loading, causes the airplane to yaw to the left when at high angles of attack. | ||
The descending right side of the propeller (as seen from the rear) has a higher angle of attack than the upward-moving blade on the left side and provides more thrust. This occurs only when the propeller is not meeting the oncoming airflow head-on, for example when an aircraft is moving down the runway at a nose-high attitude (i.e. at a high angle of attack), as is the case with tail-draggers. Aircraft with tricycle landing gear maintain a level attitude on the takeoff run, so there is little P-factor during takeoff. In all cases, though, the effect is weaker than prop wash. | The descending right side of the propeller (as seen from the rear) has a higher angle of attack than the upward-moving blade on the left side and provides more thrust. This occurs only when the propeller is not meeting the oncoming airflow head-on, for example when an aircraft is moving down the runway at a nose-high attitude (i.e. at a high angle of attack), as is the case with tail-draggers. Aircraft with tricycle landing gear maintain a level attitude on the takeoff roll run, so there is little P-factor during takeoff roll until lift off. In all cases, though, the effect is weaker than prop wash. | ||
According to What You Need to Know About Aerodyanics... by Franklin Gutierrez. | According to What You Need to Know About Aerodyanics... by Franklin Gutierrez. |
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