PROPELLER MEASUREMENTS & ANGLES
This is the correct equation for Geometric Pitch (GP) when accounting for the actual distance advanced in one revolution and the lost efficiency.
What is GP = Effective pitch + Slip?
Of the five major forces that act on a propeller as it rotates, this one is considered the most dominant.
What is centrifugal force?
Measured in inches, these designated points along a propeller are measured from the centerline of the hub outward to the blade tip.
What are blade stations?
This specific force (Aerodynamic Twisting Moment) tends to turn the blades of a propeller toward this specific pitch position.
What is a high pitch position?
The propeller blade angle is defined as the acute angle between the chord of the blade and this specific plane.
What is the plane of rotation?
In direct opposition to the aerodynamic twisting force, the Centrifugal Twisting Moment (CTM) tends to rotate the blade toward this position.
What is a low pitch position?
The angle of attack of a propeller blade is defined as the angle between the blade chord and this flow of air.
What is the relative airstream (or relative wind)?
Thrust is produced by a rotating propeller much like a wing produces lift, by creating an area of low pressure on this specific part of the propeller.
What is in front of the blade (the back side of the blade)?
Used heavily during ground operations and taxiing, this operating range of a turboprop propeller allows it to produce zero or negative thrust.
What is the beta range?
As the propeller pulls the aircraft through the air, this specific force tends to bend the propeller tips forward.
What is thrust bending force?