SACAA CPL(H) Principles of Flight Practice Questions - SACAA Commercial Pilot Licence (Helicopter) Principles of Flight Examination Exam - SACAA CPL(H) Principles of Flight Practice Questions - SACAA Commercial Pilot Licence (Helicopter) Principles of Flight Examination Exam

Question 1

What is the key difference between pitch angle and Angle of Attack (AoA) for a helicopter main rotor blade section?

Pitch angle is the angle between the chord line and the tip path plane, whereas AoA is the angle between the chord line and the resultant relative airflow. Pitch angle is measured relative to the total rotor thrust vector, whereas AoA is measured relative to the fuselage longitudinal axis. Pitch angle changes only with cyclic movement, whereas AoA changes only with collective pitch application. Pitch angle and AoA are identical parameters in hovering flight but differ during forward flight.

Correct Answer:

Pitch angle is the angle between the chord line and the tip path plane, whereas AoA is the angle between the chord line and the resultant relative airflow.

Question 2

In a steady hover, what two primary velocity components vectorially combine to form the resultant relative airflow experienced by a rotor blade element?

Rotational velocity (VR) and induced flow velocity (Vi) Forward airspeed (TAS) and climb rate (ROC) Tip speed (Vtip) and tail rotor thrust velocity Horizontal flapping speed and dynamic pressure

Correct Answer:

Rotational velocity (VR) and induced flow velocity (Vi)

Question 3

Why are symmetrical aerofoil sections frequently utilized in helicopter main rotor blade designs?

Symmetrical aerofoils maintain a constant centre of pressure (CP) as angle of attack changes, preventing unwanted pitching moments. Symmetrical aerofoils generate higher maximum lift coefficients (CL max) than cambered aerofoils at low speeds. Symmetrical aerofoils eliminate induced drag entirely during high-speed forward flight. Symmetrical aerofoils require zero engine power to maintain rotational velocity in hover.

Correct Answer:

Symmetrical aerofoils maintain a constant centre of pressure (CP) as angle of attack changes, preventing unwanted pitching moments.

Question 4

What is the primary aerodynamic purpose of incorporate geometric blade twist (linear wash-out) in main rotor blades?

To equalize lift distribution along the blade span by giving the root a higher pitch angle than the tip. To increase rotational speed at the blade tip relative to the root. To eliminate gyroscopic precession in the rotor system. To shift the centre of gravity of the blade forward of the pitch axis.

Correct Answer:

To equalize lift distribution along the blade span by giving the root a higher pitch angle than the tip.

Question 5

A helicopter has a gross weight of 1,200 kg and a main rotor radius of 5.0 m. What is its main rotor disc loading?

15.3 kg/m² 24.0 kg/m² 48.0 kg/m² 120.0 kg/m²

Correct Answer:

15.3 kg/m²

Question 1

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Prepare with the SACAA CPL(H) Principles of Flight Practice Questions - SACAA Commercial Pilot Licence (Helicopter) Principles of Flight Examination Exam practice quiz. This question bank includes 100 questions covering rotor, main, helicopter, blade, and aerodynamic. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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SACAA CPL(H) Principles of Flight Practice Questions - SACAA Commercial Pilot Licence (Helicopter) Principles of Flight Examination Exam

This practice set contains 100 questions from the matching question bank and focuses on rotor, main, helicopter, blade, and aerodynamic. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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SACAA CPL(H) Principles of Flight Practice Questions - SACAA Commercial Pilot Licence (Helicopter) Principles of Flight Examination Exam

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