Understanding the Variable Pitch Propeller in Turboprop Aircraft Each propeller blade meets the air at a specific angle, known as the blade pitch. By changing this angle, the propeller adjusts how much air it moves — directly affecting thrust, engine load, and aircraft performance. 🔹 During takeoff, the blades are set to a low pitch angle, allowing the engine to spin faster and deliver maximum power for acceleration. 🔹 As the aircraft climbs and cruises, the constant speed unit (CSU) or propel