PPL » Aircraft Tech Knowledge (A) » Propellers
12.72.2 With respect to propeller terminology, define the meaning of the following:
(a) blade section;
(b) blade angle;
(c) helix (or pitch) angle;
(d) angle of attack.
12.72.4 Explain the reason for blade (or helical) twist.
12.72.6 With the aid of a diagram, identify and define the following for a rotating blade section:
(a) direction of rotation;
(b) relative airflow;
(c) total reaction, with its components;
(d) thrust and propeller torque.
12.72.8 For a fixed-pitch propeller at a constant throttle setting, explain the relationship between airspeed, angle of attack and rpm.
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