A propeller that can be pitched to this position is known as a full feathering propeller. This prevents windmilling and cuts drag to a minimum. To prevent this, we turn the propeller to a very high pitch, so that its blades are almost parallel to the airstream. But worse than that, you could lose control of the aircraft if the propeller on the idle engine is permitted to windmill. If one of the engines fails in flight, you lose power. It reminds me to tell you something important: This system normally is used only on twin-engine aircraft. 2Ä£ OK, Professor, what is a full feathering propeller? I m glad you asked that question. EDITOR S NOTE: Don t let the professor s looks fool you. Thus, by varying the blade angle or pitch of the propeller, we can control the RPM. Then, the engine and the propeller will tend to slow down. Conversely, if the blade angle increases, the required torque increases. As blade angle is reduced, the torque required to spin the propeller is reduced and, for any given power setting, the airspeed and RPM of the engine will tend to increase. In the sense that we re talking about it, the pitch is the angle of the blades with relation to the plane of rotation. How do you control the RPM? We do it by varying the pitch of the propeller blades. 1 Professor Von Kliptip Answers Your Questions About The McCAULEY FULL FEATHERING CONSTANT SPEED PROPELLER GOVERNING SYSTEM FOR COUNTERWEIGHTED PRESSURE-TO- DECREASE PITCH PROPELLERS ON RECIPROCATING ENGINESÄ¢ Professor, what do you mean by constant speed system? We mean a constant RPM system that permits the pilot to select the propeller - and engine - speed he wants for any situation and automatically maintain that RPM under varying conditions of airspeed and power.
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