Definition
The built-in variation in blade angle from the root of a propeller or rotor blade to its tip. The blade is set at a higher angle near the root and a progressively lower angle toward the tip so that every section of the blade produces roughly the same amount of thrust or lift, despite the tip moving much faster through the air than the root.
Plain English
A propeller or rotor blade is not flat along its length. It is twisted, with a steeper angle near the hub and a flatter angle near the tip. This twist exists because the tip travels through the air much faster than the root, and without the twist the blade would push hard at the tip and barely at all near the hub.
Context Anchor
Seen in propeller and rotor discussions, especially when learning how a spinning blade produces thrust or lift along its length.
Why Pilots Care
Correct blade twist produces even thrust, reduces vibration, and improves efficiency; an incorrect twist wastes power and can damage the engine or propeller.
Grounding Statement
As a blade spins, the tip covers much more distance in the same time than the part near the hub, so the blade angle has to change along its length.
Intuition Check
Blade twist does not mean the blade has been bent or damaged. Here, it means the intentional shape built into the blade by design.
Example Sentence 1
Blade twist allows the inner and outer parts of the propeller to produce nearly equal thrust, even though they move through the air at very different speeds.
Example Sentence 2
The overhaul shop measured blade twist to confirm it still met the manufacturer’s specifications after repair.