Final answer:
A propeller will not feather below 950 RPM because feathering, which minimizes drag, is typically activated at higher RPMs to improve aircraft control during engine failure or shutdown.
Step-by-step explanation:
A propeller will not feather below 950 RPM. Feathering refers to the adjustment of the angle of the blades of a propeller to minimize drag when the engine is not running. Typically, propellers are designed to automatically feather when the engine RPM drops below a certain threshold, which is usually higher than 950 RPM. Feathering is important because it reduces drag and allows the aircraft to maintain better control during engine failure or shutdown.
For example, in aircraft with constant speed propellers, when the engine RPM drops below a specific value, called the feathering RPM, the propeller blades will automatically adjust to a flat or nearly flat position, reducing drag and allowing the aircraft to glide more efficiently. This helps to prevent the propeller from windmilling or causing unnecessary drag when the engine is not running.
In conclusion, the propeller will not feather below 950 RPM because feathering is typically activated at higher RPMs to reduce drag and improve aircraft control during engine failure or shutdown.