Definition
The product of the centrifugal force acting on a rotating mass and the perpendicular distance from the axis of rotation to the line of action of that force. It represents the turning effect that the outward-pulling force of rotation exerts about a given axis or pivot point.
Plain English
When something spins, the parts being flung outward create a twisting effect around the center. Centrifugal moment is a measure of how strong that twisting effect is — the heavier the part and the farther it sits from the spin axis, the bigger the moment.
Context Anchor
Seen in propeller theory and constant-speed propeller discussions, especially when learning what forces act on a spinning propeller blade.
Derivation
From Latin centrum (center) and fugere (to flee), so centrifugal literally means 'fleeing the center.' Moment comes from Latin momentum, meaning 'movement' or 'turning effect about a point.' Together: the turning effect produced by something trying to fly outward from the center of rotation.
Why Pilots Care
This force influences propeller pitch behavior and is countered by pitch-change mechanisms, affecting engine performance and safety in constant-speed systems.
Analogy
It is like swinging a loose object on a string: the object pulls outward as it spins, and that pull can also make the object line up in a certain direction.
Intuition Check
Do not read “moment” as “a short time.” Here, a moment is a turning force. Do not read “centrifugal” as a separate engine part. It is the outward effect created by spinning.
Example Sentence 1
The counterweights on the propeller blades use centrifugal moment to help change blade pitch as the propeller spins.
Example Sentence 2
During propeller overhaul, technicians account for centrifugal moment when balancing blade assemblies.