Propellers

Why is a propeller twisted?

• To maintain the correct angle of attack across the length of the blade

• To maintain the correct blade angle across the length of the blade

• To be more aerodynamic

• To reduce the amount of drag the propeller blade creates

What is the purpose of a spinner?

• To make the front of the aircraft more aerodynamic

• To make the propeller more efficient

• To direct air into the engine

• To increase the maximum airspeed of the aircraft

What is the blade angle?

• The angle between the chord line and the plane of rotation

• The angle between the chord line and the RAF

• The angle between the RAF and the plane of rotation

• The angle between the advance per revolution and the relative airflow

What is the angle of attack?

• The angle between the chord line and the plane of rotation

• The angle between the chord line and the RAF

• The angle between the RAF and the plane of rotation

• The angle between the advance per revolution and the relative airflow

What is the helix angle

• The angle between the chord line and the plane of rotation

• The angle between the chord line and the RAF

• The angle between the RAF and the plane of rotation

• The angle between the advance per revolution and the relative airflow

Why is the root of a propeller blade not very aerodynamic?

• It must be strong to withstand all of the aerodynamic forces

• To aid with the twisting of the blade

• Propeller blades aren't very strong so the root provides structural support

• All propeller blades must have the same shaped root so that they can be interchanged between aircraft

What pitch setting would you want on an aircraft that is wanting to be used to land on short home-made airstrips?

• Coarse pitch

• An evenly pitched blade

• The propeller pitch doesn't matter, only the engine size

• Fine pitch

What is the main advantage of a variable pitch propeller?

• It is most efficient at a wide range of airspeeds

• It is lighter

• It is more simple to operate

• A variable pitch propeller can provide more horsepower

If you wanted to increase power in an aircraft with a CSU what is the order you would operate the levers in the cockpit?

• Mixture, Pitch, Throttle

• Throttle, Pitch, Mixture

• Mixture, Throttle, Pitch

• Pitch, Throttle, Mixture

If you wanted to decrease power in an aircraft with a CSU what is the order you would operate the levers in the cockpit?

• Throttle, Pitch, Mixture

• Mixture, Pitch, Throttle

• Pitch, Throttle, Mixture

• Mixture, Throttle, Pitch