The blade angle of a propeller is defined as the angle between which two components?

The blade angle of a propeller specifically describes the angle between the propeller chord and the plane of rotation of the propeller. This angle is critical because it influences the thrust produced by the propeller as well as its efficiency. The chord of the blade serves as a reference line, and when the angle is measured against the plane in which the propeller rotates, it provides key insights into the aerodynamic performance and operational characteristics of the propeller.

Understanding this relationship is essential in propulsion design and analysis as it affects how effectively the propeller converts engine power into thrust. Engaging with this aspect of propeller design facilitates better predictions of performance under various flight conditions.

In other options, the definitions of blade angles confuse their relationships with other components rather than focusing directly on the functional angle involved in the propeller's performance.