Definition
A force acting on a rotating propeller blade that tries to rotate the blade toward a flatter, lower-pitch angle. It is produced by centrifugal force pulling each part of the spinning blade outward along the plane of rotation, which works against the blade's twisted shape and tends to twist it toward flat pitch.
Plain English
When a propeller spins, the blades are pulled outward by the spin. Because the blades are twisted, that outward pull tries to untwist them — flattening the blade angle. That twisting effect is the centrifugal twisting moment.
Context Anchor
Seen in propeller theory, especially when learning how propeller blade angle is held or changed during operation.
Derivation
Centrifugal comes from the Latin centrum (center) and fugere (to flee) — literally 'fleeing the center.' A moment, in mechanics, is a turning or twisting force around a pivot. So the name describes exactly what it is: a twisting force created by the blade's tendency to fling outward from the hub.
Why Pilots Care
It influences propeller design and must be balanced with aerodynamic twisting moment to maintain desired blade angles.
Grounding Statement
Picture a spinning propeller blade being pulled outward; because the blade has shape and mass, that outward pull also tries to twist it flatter.
Intuition Check
Moment does not mean “a short time” here. It means a turning or twisting effect.
Example Sentence 1
The propeller's pitch-change mechanism must overcome centrifugal twisting moment to hold the blades at a higher pitch angle.
Example Sentence 2
Pilots must account for centrifugal twisting moment when selecting propeller types for different aircraft performance needs.