Blade pitch, or simply pitch, is the angle formed between the chord line of a propeller blade and the plane of its rotation. This angle plays a crucial role in how effectively a propeller operates. When we talk about blade pitch, we often express it in terms of how far the propeller would theoretically move forward in one full rotation, assuming no slippage occurs. There are two main types of pitch: ‘fine’ and ‘coarse.’ Fine pitch indicates a lower angle, which is beneficial for low-speed acceleration, such as during takeoff and climbing. In contrast, coarse pitch refers to a higher angle, optimizing performance at high speeds and improving fuel economy during cruise. Understanding these concepts can help pilots and engineers make better decisions about propeller selection and usage.
