EASA Part-66 Module 17: Propeller
Propeller construction, pitch control, synchronising and maintenance.
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Interactive simulations
Manipulate the theory yourself, drag the controls and watch it respond.
Sample exam questions
Real Part-66-style multiple choice with explanations. Options are shuffled each attempt, just like the exam.
Fundamentals, quiz
1. Blade twist (washout) along a propeller blade is needed because:
The tip travels faster than the root, so needs a smaller blade angleThe root travels faster than the tipThe blade is made of two materials2. Geometric pitch is:
The distance a propeller would advance in one turn with no slipThe distance it actually advancesThe blade width3. Propeller slip is the difference between:
Geometric pitch and effective pitchBlade angle and camberTip speed and root speed4. The blade angle of a propeller is normally quoted at:
The 75% radius stationThe blade rootThe very tip5. On the propeller blade section shown, the angle marked P lies between the plane of rotation and the chord line. It is the:
Blade angleAngle of attackHelix angle6. On the same section, the angle marked Q lies between the relative airflow and the chord line. In the cruise it is:
The angle of attack, which falls as forward speed risesThe blade angle, which is fixed by the hubThe angle of incidence, set on rigging7. A propeller converts engine power into:
ThrustElectrical powerHeat only8. Blade angle (pitch) is measured between the chord and the:
Plane of rotationRelative airflowFuselage axis
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