Variable-pitch

Variable-pitch refers to the ability of an aircraft's propeller to change its blade pitch angle while in operation. This allows the propeller to maintain a constant speed and optimize the angle of attack for the current flight conditions, resulting in improved performance and efficiency. Variable-pitch propellers are commonly used on aircraft with piston or turboprop engines, and can be controlled manually or automatically. In manual control, the pilot adjusts the pitch angle using a lever in the cockpit. In automatic control, a governor adjusts the pitch angle based on engine and aircraft parameters.
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