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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.

12.72.10

Briefly explain the factors which affect the ability of a fixed-pitch propeller to convert engine power into useful thrust.

12.72.12

Explain the basic principle of operation for a constant-speed propeller, and the normal procedure for changing power settings with the manifold pressure and pitch controls.

12.72.14

State the principal advantage of a constant-speed versus a fixed-pitch propeller.

12.72.16

Describe the function and operation of a typical reduction gearbox.

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