Definition
On a constant-speed propeller, the span of pitch angles between the mechanical low-pitch stop and the high-pitch stop within which the propeller governor is free to rotate the blades to maintain the selected engine RPM.
Plain English
It is the range of blade positions, from flattest to steepest, that the propeller is allowed to move between while the governor adjusts pitch to hold a steady RPM.
Context Anchor
Seen in discussions of constant-speed propellers and the governing range of the propeller control system.
Why Pilots Care
It defines the RPM control limits available before the propeller hits a mechanical stop, affecting engine performance and preventing overspeed.
Grounding Statement
Picture each propeller blade twisting slightly: the blade angle range is the amount of twist available between its two usable limits.
Intuition Check
Range does not mean distance across the sky here. It means the usable span between the propeller blade's lowest and highest angle settings.
Example Sentence 1
As long as the blades stay within the blade angle range, the governor will hold the selected RPM through climbs and descents.
Example Sentence 2
If airspeed drops too low the blades reach the low-pitch stop and RPM begins to rise.